1 /* |
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2 * ZIP support routines for PhysicsFS. |
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3 * |
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4 * Please see the file LICENSE.txt in the source's root directory. |
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5 * |
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6 * This file written by Ryan C. Gordon, with some peeking at "unzip.c" |
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7 * by Gilles Vollant. |
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8 */ |
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9 |
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10 #define __PHYSICSFS_INTERNAL__ |
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11 #include "physfs_internal.h" |
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12 |
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13 #if PHYSFS_SUPPORTS_ZIP |
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14 |
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15 #include <errno.h> |
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16 #include <time.h> |
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17 |
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18 #include "physfs_miniz.h" |
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19 |
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20 /* |
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21 * A buffer of ZIP_READBUFSIZE is allocated for each compressed file opened, |
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22 * and is freed when you close the file; compressed data is read into |
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23 * this buffer, and then is decompressed into the buffer passed to |
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24 * PHYSFS_read(). |
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25 * |
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26 * Uncompressed entries in a zipfile do not allocate this buffer; they just |
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27 * read data directly into the buffer passed to PHYSFS_read(). |
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28 * |
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29 * Depending on your speed and memory requirements, you should tweak this |
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30 * value. |
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31 */ |
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32 #define ZIP_READBUFSIZE (16 * 1024) |
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33 |
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34 |
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35 /* |
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36 * Entries are "unresolved" until they are first opened. At that time, |
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37 * local file headers parsed/validated, data offsets will be updated to look |
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38 * at the actual file data instead of the header, and symlinks will be |
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39 * followed and optimized. This means that we don't seek and read around the |
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40 * archive until forced to do so, and after the first time, we had to do |
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41 * less reading and parsing, which is very CD-ROM friendly. |
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42 */ |
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43 typedef enum |
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44 { |
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45 ZIP_UNRESOLVED_FILE, |
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46 ZIP_UNRESOLVED_SYMLINK, |
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47 ZIP_RESOLVING, |
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48 ZIP_RESOLVED, |
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49 ZIP_DIRECTORY, |
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50 ZIP_BROKEN_FILE, |
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51 ZIP_BROKEN_SYMLINK |
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52 } ZipResolveType; |
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53 |
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54 |
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55 /* |
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56 * One ZIPentry is kept for each file in an open ZIP archive. |
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57 */ |
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58 typedef struct _ZIPentry |
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59 { |
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60 char *name; /* Name of file in archive */ |
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61 struct _ZIPentry *symlink; /* NULL or file we symlink to */ |
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62 ZipResolveType resolved; /* Have we resolved file/symlink? */ |
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63 PHYSFS_uint64 offset; /* offset of data in archive */ |
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64 PHYSFS_uint16 version; /* version made by */ |
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65 PHYSFS_uint16 version_needed; /* version needed to extract */ |
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66 PHYSFS_uint16 general_bits; /* general purpose bits */ |
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67 PHYSFS_uint16 compression_method; /* compression method */ |
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68 PHYSFS_uint32 crc; /* crc-32 */ |
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69 PHYSFS_uint64 compressed_size; /* compressed size */ |
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70 PHYSFS_uint64 uncompressed_size; /* uncompressed size */ |
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71 PHYSFS_sint64 last_mod_time; /* last file mod time */ |
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72 PHYSFS_uint32 dos_mod_time; /* original MS-DOS style mod time */ |
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73 struct _ZIPentry *hashnext; /* next item in this hash bucket */ |
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74 struct _ZIPentry *children; /* linked list of kids, if dir */ |
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75 struct _ZIPentry *sibling; /* next item in same dir */ |
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76 } ZIPentry; |
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77 |
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78 /* |
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79 * One ZIPinfo is kept for each open ZIP archive. |
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80 */ |
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81 typedef struct |
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82 { |
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83 PHYSFS_Io *io; /* the i/o interface for this archive. */ |
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84 ZIPentry root; /* root of directory tree. */ |
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85 ZIPentry **hash; /* all entries hashed for fast lookup. */ |
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86 size_t hashBuckets; /* number of buckets in hash. */ |
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87 int zip64; /* non-zero if this is a Zip64 archive. */ |
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88 int has_crypto; /* non-zero if any entry uses encryption. */ |
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89 } ZIPinfo; |
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90 |
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91 /* |
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92 * One ZIPfileinfo is kept for each open file in a ZIP archive. |
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93 */ |
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94 typedef struct |
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95 { |
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96 ZIPentry *entry; /* Info on file. */ |
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97 PHYSFS_Io *io; /* physical file handle. */ |
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98 PHYSFS_uint32 compressed_position; /* offset in compressed data. */ |
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99 PHYSFS_uint32 uncompressed_position; /* tell() position. */ |
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100 PHYSFS_uint8 *buffer; /* decompression buffer. */ |
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101 PHYSFS_uint32 crypto_keys[3]; /* for "traditional" crypto. */ |
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102 PHYSFS_uint32 initial_crypto_keys[3]; /* for "traditional" crypto. */ |
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103 z_stream stream; /* zlib stream state. */ |
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104 } ZIPfileinfo; |
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105 |
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106 |
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107 /* Magic numbers... */ |
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108 #define ZIP_LOCAL_FILE_SIG 0x04034b50 |
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109 #define ZIP_CENTRAL_DIR_SIG 0x02014b50 |
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110 #define ZIP_END_OF_CENTRAL_DIR_SIG 0x06054b50 |
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111 #define ZIP64_END_OF_CENTRAL_DIR_SIG 0x06064b50 |
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112 #define ZIP64_END_OF_CENTRAL_DIRECTORY_LOCATOR_SIG 0x07064b50 |
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113 #define ZIP64_EXTENDED_INFO_EXTRA_FIELD_SIG 0x0001 |
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114 |
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115 /* compression methods... */ |
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116 #define COMPMETH_NONE 0 |
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117 /* ...and others... */ |
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118 |
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119 |
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120 #define UNIX_FILETYPE_MASK 0170000 |
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121 #define UNIX_FILETYPE_SYMLINK 0120000 |
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122 |
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123 #define ZIP_GENERAL_BITS_TRADITIONAL_CRYPTO (1 << 0) |
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124 #define ZIP_GENERAL_BITS_IGNORE_LOCAL_HEADER (1 << 3) |
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125 |
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126 /* support for "traditional" PKWARE encryption. */ |
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127 static int zip_entry_is_tradional_crypto(const ZIPentry *entry) |
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128 { |
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129 return (entry->general_bits & ZIP_GENERAL_BITS_TRADITIONAL_CRYPTO) != 0; |
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130 } /* zip_entry_is_traditional_crypto */ |
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131 |
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132 static int zip_entry_ignore_local_header(const ZIPentry *entry) |
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133 { |
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134 return (entry->general_bits & ZIP_GENERAL_BITS_IGNORE_LOCAL_HEADER) != 0; |
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135 } /* zip_entry_is_traditional_crypto */ |
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136 |
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137 static PHYSFS_uint32 zip_crypto_crc32(const PHYSFS_uint32 crc, const PHYSFS_uint8 val) |
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138 { |
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139 int i; |
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140 PHYSFS_uint32 xorval = (crc ^ ((PHYSFS_uint32) val)) & 0xFF; |
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141 for (i = 0; i < 8; i++) |
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142 xorval = ((xorval & 1) ? (0xEDB88320 ^ (xorval >> 1)) : (xorval >> 1)); |
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143 return xorval ^ (crc >> 8); |
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144 } /* zip_crc32 */ |
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145 |
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146 static void zip_update_crypto_keys(PHYSFS_uint32 *keys, const PHYSFS_uint8 val) |
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147 { |
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148 keys[0] = zip_crypto_crc32(keys[0], val); |
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149 keys[1] = keys[1] + (keys[0] & 0x000000FF); |
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150 keys[1] = (keys[1] * 134775813) + 1; |
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151 keys[2] = zip_crypto_crc32(keys[2], (PHYSFS_uint8) ((keys[1] >> 24) & 0xFF)); |
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152 } /* zip_update_crypto_keys */ |
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153 |
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154 static PHYSFS_uint8 zip_decrypt_byte(const PHYSFS_uint32 *keys) |
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155 { |
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156 const PHYSFS_uint16 tmp = keys[2] | 2; |
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157 return (PHYSFS_uint8) ((tmp * (tmp ^ 1)) >> 8); |
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158 } /* zip_decrypt_byte */ |
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159 |
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160 static PHYSFS_sint64 zip_read_decrypt(ZIPfileinfo *finfo, void *buf, PHYSFS_uint64 len) |
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161 { |
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162 PHYSFS_Io *io = finfo->io; |
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163 const PHYSFS_sint64 br = io->read(io, buf, len); |
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164 |
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165 /* Decompression the new data if necessary. */ |
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166 if (zip_entry_is_tradional_crypto(finfo->entry) && (br > 0)) |
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167 { |
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168 PHYSFS_uint32 *keys = finfo->crypto_keys; |
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169 PHYSFS_uint8 *ptr = (PHYSFS_uint8 *) buf; |
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170 PHYSFS_sint64 i; |
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171 for (i = 0; i < br; i++, ptr++) |
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172 { |
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173 const PHYSFS_uint8 ch = *ptr ^ zip_decrypt_byte(keys); |
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174 zip_update_crypto_keys(keys, ch); |
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175 *ptr = ch; |
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176 } /* for */ |
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177 } /* if */ |
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178 |
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179 return br; |
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180 } /* zip_read_decrypt */ |
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181 |
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182 static int zip_prep_crypto_keys(ZIPfileinfo *finfo, const PHYSFS_uint8 *crypto_header, const PHYSFS_uint8 *password) |
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183 { |
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184 /* It doesn't appear to be documented in PKWare's APPNOTE.TXT, but you |
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185 need to use a different byte in the header to verify the password |
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186 if general purpose bit 3 is set. Discovered this from Info-Zip. |
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187 That's what the (verifier) value is doing, below. */ |
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188 |
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189 PHYSFS_uint32 *keys = finfo->crypto_keys; |
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190 const ZIPentry *entry = finfo->entry; |
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191 const int usedate = zip_entry_ignore_local_header(entry); |
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192 const PHYSFS_uint8 verifier = (PHYSFS_uint8) ((usedate ? (entry->dos_mod_time >> 8) : (entry->crc >> 24)) & 0xFF); |
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193 PHYSFS_uint8 finalbyte = 0; |
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194 int i = 0; |
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195 |
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196 /* initialize vector with defaults, then password, then header. */ |
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197 keys[0] = 305419896; |
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198 keys[1] = 591751049; |
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199 keys[2] = 878082192; |
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200 |
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201 while (*password) |
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202 zip_update_crypto_keys(keys, *(password++)); |
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203 |
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204 for (i = 0; i < 12; i++) |
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205 { |
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206 const PHYSFS_uint8 c = crypto_header[i] ^ zip_decrypt_byte(keys); |
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207 zip_update_crypto_keys(keys, c); |
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208 finalbyte = c; |
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209 } /* for */ |
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210 |
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211 /* you have a 1/256 chance of passing this test incorrectly. :/ */ |
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212 if (finalbyte != verifier) |
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213 BAIL_MACRO(PHYSFS_ERR_BAD_PASSWORD, 0); |
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214 |
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215 /* save the initial vector for seeking purposes. Not secure!! */ |
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216 memcpy(finfo->initial_crypto_keys, finfo->crypto_keys, 12); |
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217 return 1; |
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218 } /* zip_prep_crypto_keys */ |
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219 |
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220 |
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221 /* |
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222 * Bridge physfs allocation functions to zlib's format... |
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223 */ |
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224 static voidpf zlibPhysfsAlloc(voidpf opaque, uInt items, uInt size) |
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225 { |
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226 return ((PHYSFS_Allocator *) opaque)->Malloc(items * size); |
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227 } /* zlibPhysfsAlloc */ |
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228 |
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229 /* |
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230 * Bridge physfs allocation functions to zlib's format... |
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231 */ |
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232 static void zlibPhysfsFree(voidpf opaque, voidpf address) |
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233 { |
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234 ((PHYSFS_Allocator *) opaque)->Free(address); |
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235 } /* zlibPhysfsFree */ |
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236 |
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237 |
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238 /* |
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239 * Construct a new z_stream to a sane state. |
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240 */ |
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241 static void initializeZStream(z_stream *pstr) |
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242 { |
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243 memset(pstr, '\0', sizeof (z_stream)); |
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244 pstr->zalloc = zlibPhysfsAlloc; |
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245 pstr->zfree = zlibPhysfsFree; |
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246 pstr->opaque = &allocator; |
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247 } /* initializeZStream */ |
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248 |
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249 |
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250 static PHYSFS_ErrorCode zlib_error_code(int rc) |
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251 { |
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252 switch (rc) |
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253 { |
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254 case Z_OK: return PHYSFS_ERR_OK; /* not an error. */ |
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255 case Z_STREAM_END: return PHYSFS_ERR_OK; /* not an error. */ |
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256 case Z_ERRNO: return PHYSFS_ERR_IO; |
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257 case Z_MEM_ERROR: return PHYSFS_ERR_OUT_OF_MEMORY; |
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258 default: return PHYSFS_ERR_CORRUPT; |
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259 } /* switch */ |
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260 } /* zlib_error_string */ |
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261 |
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262 |
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263 /* |
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264 * Wrap all zlib calls in this, so the physfs error state is set appropriately. |
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265 */ |
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266 static int zlib_err(const int rc) |
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267 { |
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268 PHYSFS_setErrorCode(zlib_error_code(rc)); |
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269 return rc; |
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270 } /* zlib_err */ |
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271 |
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272 /* |
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273 * Hash a string for lookup an a ZIPinfo hashtable. |
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274 */ |
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275 static inline PHYSFS_uint32 zip_hash_string(const ZIPinfo *info, const char *s) |
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276 { |
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277 return __PHYSFS_hashString(s, strlen(s)) % info->hashBuckets; |
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278 } /* zip_hash_string */ |
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279 |
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280 /* |
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281 * Read an unsigned 64-bit int and swap to native byte order. |
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282 */ |
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283 static int readui64(PHYSFS_Io *io, PHYSFS_uint64 *val) |
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284 { |
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285 PHYSFS_uint64 v; |
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286 BAIL_IF_MACRO(!__PHYSFS_readAll(io, &v, sizeof (v)), ERRPASS, 0); |
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287 *val = PHYSFS_swapULE64(v); |
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288 return 1; |
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289 } /* readui64 */ |
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290 |
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291 /* |
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292 * Read an unsigned 32-bit int and swap to native byte order. |
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293 */ |
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294 static int readui32(PHYSFS_Io *io, PHYSFS_uint32 *val) |
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295 { |
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296 PHYSFS_uint32 v; |
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297 BAIL_IF_MACRO(!__PHYSFS_readAll(io, &v, sizeof (v)), ERRPASS, 0); |
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298 *val = PHYSFS_swapULE32(v); |
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299 return 1; |
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300 } /* readui32 */ |
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301 |
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302 |
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303 /* |
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304 * Read an unsigned 16-bit int and swap to native byte order. |
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305 */ |
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306 static int readui16(PHYSFS_Io *io, PHYSFS_uint16 *val) |
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307 { |
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308 PHYSFS_uint16 v; |
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309 BAIL_IF_MACRO(!__PHYSFS_readAll(io, &v, sizeof (v)), ERRPASS, 0); |
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310 *val = PHYSFS_swapULE16(v); |
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311 return 1; |
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312 } /* readui16 */ |
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313 |
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314 |
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315 static PHYSFS_sint64 ZIP_read(PHYSFS_Io *_io, void *buf, PHYSFS_uint64 len) |
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316 { |
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317 ZIPfileinfo *finfo = (ZIPfileinfo *) _io->opaque; |
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318 ZIPentry *entry = finfo->entry; |
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319 PHYSFS_sint64 retval = 0; |
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320 PHYSFS_sint64 maxread = (PHYSFS_sint64) len; |
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321 PHYSFS_sint64 avail = entry->uncompressed_size - |
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322 finfo->uncompressed_position; |
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323 |
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324 if (avail < maxread) |
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325 maxread = avail; |
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326 |
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327 BAIL_IF_MACRO(maxread == 0, ERRPASS, 0); /* quick rejection. */ |
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328 |
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329 if (entry->compression_method == COMPMETH_NONE) |
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330 retval = zip_read_decrypt(finfo, buf, maxread); |
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331 else |
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332 { |
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333 finfo->stream.next_out = buf; |
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334 finfo->stream.avail_out = (uInt) maxread; |
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335 |
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336 while (retval < maxread) |
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337 { |
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338 PHYSFS_uint32 before = finfo->stream.total_out; |
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339 int rc; |
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340 |
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341 if (finfo->stream.avail_in == 0) |
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342 { |
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343 PHYSFS_sint64 br; |
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344 |
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345 br = entry->compressed_size - finfo->compressed_position; |
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346 if (br > 0) |
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347 { |
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348 if (br > ZIP_READBUFSIZE) |
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349 br = ZIP_READBUFSIZE; |
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350 |
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351 br = zip_read_decrypt(finfo, finfo->buffer, (PHYSFS_uint64) br); |
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352 if (br <= 0) |
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353 break; |
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354 |
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355 finfo->compressed_position += (PHYSFS_uint32) br; |
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356 finfo->stream.next_in = finfo->buffer; |
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357 finfo->stream.avail_in = (PHYSFS_uint32) br; |
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358 } /* if */ |
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359 } /* if */ |
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360 |
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361 rc = zlib_err(inflate(&finfo->stream, Z_SYNC_FLUSH)); |
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362 retval += (finfo->stream.total_out - before); |
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363 |
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364 if (rc != Z_OK) |
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365 break; |
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366 } /* while */ |
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367 } /* else */ |
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368 |
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369 if (retval > 0) |
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370 finfo->uncompressed_position += (PHYSFS_uint32) retval; |
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371 |
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372 return retval; |
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373 } /* ZIP_read */ |
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374 |
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375 |
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376 static PHYSFS_sint64 ZIP_write(PHYSFS_Io *io, const void *b, PHYSFS_uint64 len) |
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377 { |
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378 BAIL_MACRO(PHYSFS_ERR_READ_ONLY, -1); |
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379 } /* ZIP_write */ |
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380 |
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381 |
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382 static PHYSFS_sint64 ZIP_tell(PHYSFS_Io *io) |
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383 { |
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384 return ((ZIPfileinfo *) io->opaque)->uncompressed_position; |
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385 } /* ZIP_tell */ |
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386 |
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387 |
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388 static int ZIP_seek(PHYSFS_Io *_io, PHYSFS_uint64 offset) |
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389 { |
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390 ZIPfileinfo *finfo = (ZIPfileinfo *) _io->opaque; |
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391 ZIPentry *entry = finfo->entry; |
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392 PHYSFS_Io *io = finfo->io; |
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393 const int encrypted = zip_entry_is_tradional_crypto(entry); |
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394 |
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395 BAIL_IF_MACRO(offset > entry->uncompressed_size, PHYSFS_ERR_PAST_EOF, 0); |
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396 |
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397 if (!encrypted && (entry->compression_method == COMPMETH_NONE)) |
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398 { |
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399 PHYSFS_sint64 newpos = offset + entry->offset; |
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400 BAIL_IF_MACRO(!io->seek(io, newpos), ERRPASS, 0); |
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401 finfo->uncompressed_position = (PHYSFS_uint32) offset; |
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402 } /* if */ |
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403 |
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404 else |
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405 { |
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406 /* |
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407 * If seeking backwards, we need to redecode the file |
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408 * from the start and throw away the compressed bits until we hit |
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409 * the offset we need. If seeking forward, we still need to |
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410 * decode, but we don't rewind first. |
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411 */ |
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412 if (offset < finfo->uncompressed_position) |
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413 { |
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414 /* we do a copy so state is sane if inflateInit2() fails. */ |
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415 z_stream str; |
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416 initializeZStream(&str); |
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417 if (zlib_err(inflateInit2(&str, -MAX_WBITS)) != Z_OK) |
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418 return 0; |
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419 |
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420 if (!io->seek(io, entry->offset + (encrypted ? 12 : 0))) |
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421 return 0; |
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422 |
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423 inflateEnd(&finfo->stream); |
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424 memcpy(&finfo->stream, &str, sizeof (z_stream)); |
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425 finfo->uncompressed_position = finfo->compressed_position = 0; |
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426 |
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427 if (encrypted) |
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428 memcpy(finfo->crypto_keys, finfo->initial_crypto_keys, 12); |
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429 } /* if */ |
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430 |
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431 while (finfo->uncompressed_position != offset) |
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432 { |
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433 PHYSFS_uint8 buf[512]; |
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434 PHYSFS_uint32 maxread; |
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435 |
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436 maxread = (PHYSFS_uint32) (offset - finfo->uncompressed_position); |
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437 if (maxread > sizeof (buf)) |
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438 maxread = sizeof (buf); |
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439 |
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440 if (ZIP_read(_io, buf, maxread) != maxread) |
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441 return 0; |
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442 } /* while */ |
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443 } /* else */ |
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444 |
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445 return 1; |
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446 } /* ZIP_seek */ |
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447 |
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448 |
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449 static PHYSFS_sint64 ZIP_length(PHYSFS_Io *io) |
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450 { |
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451 const ZIPfileinfo *finfo = (ZIPfileinfo *) io->opaque; |
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452 return (PHYSFS_sint64) finfo->entry->uncompressed_size; |
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453 } /* ZIP_length */ |
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454 |
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455 |
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456 static PHYSFS_Io *zip_get_io(PHYSFS_Io *io, ZIPinfo *inf, ZIPentry *entry); |
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457 |
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458 static PHYSFS_Io *ZIP_duplicate(PHYSFS_Io *io) |
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459 { |
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460 ZIPfileinfo *origfinfo = (ZIPfileinfo *) io->opaque; |
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461 PHYSFS_Io *retval = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io)); |
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462 ZIPfileinfo *finfo = (ZIPfileinfo *) allocator.Malloc(sizeof (ZIPfileinfo)); |
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463 GOTO_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, failed); |
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464 GOTO_IF_MACRO(!finfo, PHYSFS_ERR_OUT_OF_MEMORY, failed); |
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465 memset(finfo, '\0', sizeof (*finfo)); |
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466 |
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467 finfo->entry = origfinfo->entry; |
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468 finfo->io = zip_get_io(origfinfo->io, NULL, finfo->entry); |
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469 GOTO_IF_MACRO(!finfo->io, ERRPASS, failed); |
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470 |
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471 if (finfo->entry->compression_method != COMPMETH_NONE) |
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472 { |
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473 finfo->buffer = (PHYSFS_uint8 *) allocator.Malloc(ZIP_READBUFSIZE); |
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474 GOTO_IF_MACRO(!finfo->buffer, PHYSFS_ERR_OUT_OF_MEMORY, failed); |
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475 if (zlib_err(inflateInit2(&finfo->stream, -MAX_WBITS)) != Z_OK) |
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476 goto failed; |
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477 } /* if */ |
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478 |
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479 memcpy(retval, io, sizeof (PHYSFS_Io)); |
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480 retval->opaque = finfo; |
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481 return retval; |
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482 |
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483 failed: |
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484 if (finfo != NULL) |
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485 { |
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486 if (finfo->io != NULL) |
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487 finfo->io->destroy(finfo->io); |
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488 |
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489 if (finfo->buffer != NULL) |
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490 { |
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491 allocator.Free(finfo->buffer); |
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492 inflateEnd(&finfo->stream); |
|
493 } /* if */ |
|
494 |
|
495 allocator.Free(finfo); |
|
496 } /* if */ |
|
497 |
|
498 if (retval != NULL) |
|
499 allocator.Free(retval); |
|
500 |
|
501 return NULL; |
|
502 } /* ZIP_duplicate */ |
|
503 |
|
504 static int ZIP_flush(PHYSFS_Io *io) { return 1; /* no write support. */ } |
|
505 |
|
506 static void ZIP_destroy(PHYSFS_Io *io) |
|
507 { |
|
508 ZIPfileinfo *finfo = (ZIPfileinfo *) io->opaque; |
|
509 finfo->io->destroy(finfo->io); |
|
510 |
|
511 if (finfo->entry->compression_method != COMPMETH_NONE) |
|
512 inflateEnd(&finfo->stream); |
|
513 |
|
514 if (finfo->buffer != NULL) |
|
515 allocator.Free(finfo->buffer); |
|
516 |
|
517 allocator.Free(finfo); |
|
518 allocator.Free(io); |
|
519 } /* ZIP_destroy */ |
|
520 |
|
521 |
|
522 static const PHYSFS_Io ZIP_Io = |
|
523 { |
|
524 CURRENT_PHYSFS_IO_API_VERSION, NULL, |
|
525 ZIP_read, |
|
526 ZIP_write, |
|
527 ZIP_seek, |
|
528 ZIP_tell, |
|
529 ZIP_length, |
|
530 ZIP_duplicate, |
|
531 ZIP_flush, |
|
532 ZIP_destroy |
|
533 }; |
|
534 |
|
535 |
|
536 |
|
537 static PHYSFS_sint64 zip_find_end_of_central_dir(PHYSFS_Io *io, PHYSFS_sint64 *len) |
|
538 { |
|
539 PHYSFS_uint8 buf[256]; |
|
540 PHYSFS_uint8 extra[4] = { 0, 0, 0, 0 }; |
|
541 PHYSFS_sint32 i = 0; |
|
542 PHYSFS_sint64 filelen; |
|
543 PHYSFS_sint64 filepos; |
|
544 PHYSFS_sint32 maxread; |
|
545 PHYSFS_sint32 totalread = 0; |
|
546 int found = 0; |
|
547 |
|
548 filelen = io->length(io); |
|
549 BAIL_IF_MACRO(filelen == -1, ERRPASS, -1); |
|
550 |
|
551 /* |
|
552 * Jump to the end of the file and start reading backwards. |
|
553 * The last thing in the file is the zipfile comment, which is variable |
|
554 * length, and the field that specifies its size is before it in the |
|
555 * file (argh!)...this means that we need to scan backwards until we |
|
556 * hit the end-of-central-dir signature. We can then sanity check that |
|
557 * the comment was as big as it should be to make sure we're in the |
|
558 * right place. The comment length field is 16 bits, so we can stop |
|
559 * searching for that signature after a little more than 64k at most, |
|
560 * and call it a corrupted zipfile. |
|
561 */ |
|
562 |
|
563 if (sizeof (buf) < filelen) |
|
564 { |
|
565 filepos = filelen - sizeof (buf); |
|
566 maxread = sizeof (buf); |
|
567 } /* if */ |
|
568 else |
|
569 { |
|
570 filepos = 0; |
|
571 maxread = (PHYSFS_uint32) filelen; |
|
572 } /* else */ |
|
573 |
|
574 while ((totalread < filelen) && (totalread < 65557)) |
|
575 { |
|
576 BAIL_IF_MACRO(!io->seek(io, filepos), ERRPASS, -1); |
|
577 |
|
578 /* make sure we catch a signature between buffers. */ |
|
579 if (totalread != 0) |
|
580 { |
|
581 if (!__PHYSFS_readAll(io, buf, maxread - 4)) |
|
582 return -1; |
|
583 memcpy(&buf[maxread - 4], &extra, sizeof (extra)); |
|
584 totalread += maxread - 4; |
|
585 } /* if */ |
|
586 else |
|
587 { |
|
588 if (!__PHYSFS_readAll(io, buf, maxread)) |
|
589 return -1; |
|
590 totalread += maxread; |
|
591 } /* else */ |
|
592 |
|
593 memcpy(&extra, buf, sizeof (extra)); |
|
594 |
|
595 for (i = maxread - 4; i > 0; i--) |
|
596 { |
|
597 if ((buf[i + 0] == 0x50) && |
|
598 (buf[i + 1] == 0x4B) && |
|
599 (buf[i + 2] == 0x05) && |
|
600 (buf[i + 3] == 0x06) ) |
|
601 { |
|
602 found = 1; /* that's the signature! */ |
|
603 break; |
|
604 } /* if */ |
|
605 } /* for */ |
|
606 |
|
607 if (found) |
|
608 break; |
|
609 |
|
610 filepos -= (maxread - 4); |
|
611 if (filepos < 0) |
|
612 filepos = 0; |
|
613 } /* while */ |
|
614 |
|
615 BAIL_IF_MACRO(!found, PHYSFS_ERR_UNSUPPORTED, -1); |
|
616 |
|
617 if (len != NULL) |
|
618 *len = filelen; |
|
619 |
|
620 return (filepos + i); |
|
621 } /* zip_find_end_of_central_dir */ |
|
622 |
|
623 |
|
624 static int isZip(PHYSFS_Io *io) |
|
625 { |
|
626 PHYSFS_uint32 sig = 0; |
|
627 int retval = 0; |
|
628 |
|
629 /* |
|
630 * The first thing in a zip file might be the signature of the |
|
631 * first local file record, so it makes for a quick determination. |
|
632 */ |
|
633 if (readui32(io, &sig)) |
|
634 { |
|
635 retval = (sig == ZIP_LOCAL_FILE_SIG); |
|
636 if (!retval) |
|
637 { |
|
638 /* |
|
639 * No sig...might be a ZIP with data at the start |
|
640 * (a self-extracting executable, etc), so we'll have to do |
|
641 * it the hard way... |
|
642 */ |
|
643 retval = (zip_find_end_of_central_dir(io, NULL) != -1); |
|
644 } /* if */ |
|
645 } /* if */ |
|
646 |
|
647 return retval; |
|
648 } /* isZip */ |
|
649 |
|
650 |
|
651 /* Find the ZIPentry for a path in platform-independent notation. */ |
|
652 static ZIPentry *zip_find_entry(ZIPinfo *info, const char *path) |
|
653 { |
|
654 PHYSFS_uint32 hashval; |
|
655 ZIPentry *prev = NULL; |
|
656 ZIPentry *retval; |
|
657 |
|
658 if (*path == '\0') |
|
659 return &info->root; |
|
660 |
|
661 hashval = zip_hash_string(info, path); |
|
662 for (retval = info->hash[hashval]; retval; retval = retval->hashnext) |
|
663 { |
|
664 if (strcmp(retval->name, path) == 0) |
|
665 { |
|
666 if (prev != NULL) /* move this to the front of the list */ |
|
667 { |
|
668 prev->hashnext = retval->hashnext; |
|
669 retval->hashnext = info->hash[hashval]; |
|
670 info->hash[hashval] = retval; |
|
671 } /* if */ |
|
672 |
|
673 return retval; |
|
674 } /* if */ |
|
675 |
|
676 prev = retval; |
|
677 } /* for */ |
|
678 |
|
679 BAIL_MACRO(PHYSFS_ERR_NOT_FOUND, NULL); |
|
680 } /* zip_find_entry */ |
|
681 |
|
682 |
|
683 /* Convert paths from old, buggy DOS zippers... */ |
|
684 static void zip_convert_dos_path(ZIPentry *entry, char *path) |
|
685 { |
|
686 PHYSFS_uint8 hosttype = (PHYSFS_uint8) ((entry->version >> 8) & 0xFF); |
|
687 if (hosttype == 0) /* FS_FAT_ */ |
|
688 { |
|
689 while (*path) |
|
690 { |
|
691 if (*path == '\\') |
|
692 *path = '/'; |
|
693 path++; |
|
694 } /* while */ |
|
695 } /* if */ |
|
696 } /* zip_convert_dos_path */ |
|
697 |
|
698 |
|
699 static void zip_expand_symlink_path(char *path) |
|
700 { |
|
701 char *ptr = path; |
|
702 char *prevptr = path; |
|
703 |
|
704 while (1) |
|
705 { |
|
706 ptr = strchr(ptr, '/'); |
|
707 if (ptr == NULL) |
|
708 break; |
|
709 |
|
710 if (*(ptr + 1) == '.') |
|
711 { |
|
712 if (*(ptr + 2) == '/') |
|
713 { |
|
714 /* current dir in middle of string: ditch it. */ |
|
715 memmove(ptr, ptr + 2, strlen(ptr + 2) + 1); |
|
716 } /* else if */ |
|
717 |
|
718 else if (*(ptr + 2) == '\0') |
|
719 { |
|
720 /* current dir at end of string: ditch it. */ |
|
721 *ptr = '\0'; |
|
722 } /* else if */ |
|
723 |
|
724 else if (*(ptr + 2) == '.') |
|
725 { |
|
726 if (*(ptr + 3) == '/') |
|
727 { |
|
728 /* parent dir in middle: move back one, if possible. */ |
|
729 memmove(prevptr, ptr + 4, strlen(ptr + 4) + 1); |
|
730 ptr = prevptr; |
|
731 while (prevptr != path) |
|
732 { |
|
733 prevptr--; |
|
734 if (*prevptr == '/') |
|
735 { |
|
736 prevptr++; |
|
737 break; |
|
738 } /* if */ |
|
739 } /* while */ |
|
740 } /* if */ |
|
741 |
|
742 if (*(ptr + 3) == '\0') |
|
743 { |
|
744 /* parent dir at end: move back one, if possible. */ |
|
745 *prevptr = '\0'; |
|
746 } /* if */ |
|
747 } /* if */ |
|
748 } /* if */ |
|
749 else |
|
750 { |
|
751 prevptr = ptr; |
|
752 ptr++; |
|
753 } /* else */ |
|
754 } /* while */ |
|
755 } /* zip_expand_symlink_path */ |
|
756 |
|
757 /* (forward reference: zip_follow_symlink and zip_resolve call each other.) */ |
|
758 static int zip_resolve(PHYSFS_Io *io, ZIPinfo *info, ZIPentry *entry); |
|
759 |
|
760 /* |
|
761 * Look for the entry named by (path). If it exists, resolve it, and return |
|
762 * a pointer to that entry. If it's another symlink, keep resolving until you |
|
763 * hit a real file and then return a pointer to the final non-symlink entry. |
|
764 * If there's a problem, return NULL. |
|
765 */ |
|
766 static ZIPentry *zip_follow_symlink(PHYSFS_Io *io, ZIPinfo *info, char *path) |
|
767 { |
|
768 ZIPentry *entry; |
|
769 |
|
770 zip_expand_symlink_path(path); |
|
771 entry = zip_find_entry(info, path); |
|
772 if (entry != NULL) |
|
773 { |
|
774 if (!zip_resolve(io, info, entry)) /* recursive! */ |
|
775 entry = NULL; |
|
776 else |
|
777 { |
|
778 if (entry->symlink != NULL) |
|
779 entry = entry->symlink; |
|
780 } /* else */ |
|
781 } /* if */ |
|
782 |
|
783 return entry; |
|
784 } /* zip_follow_symlink */ |
|
785 |
|
786 |
|
787 static int zip_resolve_symlink(PHYSFS_Io *io, ZIPinfo *info, ZIPentry *entry) |
|
788 { |
|
789 const PHYSFS_uint64 size = entry->uncompressed_size; |
|
790 char *path = NULL; |
|
791 int rc = 0; |
|
792 |
|
793 /* |
|
794 * We've already parsed the local file header of the symlink at this |
|
795 * point. Now we need to read the actual link from the file data and |
|
796 * follow it. |
|
797 */ |
|
798 |
|
799 BAIL_IF_MACRO(!io->seek(io, entry->offset), ERRPASS, 0); |
|
800 |
|
801 path = (char *) __PHYSFS_smallAlloc(size + 1); |
|
802 BAIL_IF_MACRO(!path, PHYSFS_ERR_OUT_OF_MEMORY, 0); |
|
803 |
|
804 if (entry->compression_method == COMPMETH_NONE) |
|
805 rc = __PHYSFS_readAll(io, path, size); |
|
806 |
|
807 else /* symlink target path is compressed... */ |
|
808 { |
|
809 z_stream stream; |
|
810 const PHYSFS_uint64 complen = entry->compressed_size; |
|
811 PHYSFS_uint8 *compressed = (PHYSFS_uint8*) __PHYSFS_smallAlloc(complen); |
|
812 if (compressed != NULL) |
|
813 { |
|
814 if (__PHYSFS_readAll(io, compressed, complen)) |
|
815 { |
|
816 initializeZStream(&stream); |
|
817 stream.next_in = compressed; |
|
818 stream.avail_in = complen; |
|
819 stream.next_out = (unsigned char *) path; |
|
820 stream.avail_out = size; |
|
821 if (zlib_err(inflateInit2(&stream, -MAX_WBITS)) == Z_OK) |
|
822 { |
|
823 rc = zlib_err(inflate(&stream, Z_FINISH)); |
|
824 inflateEnd(&stream); |
|
825 |
|
826 /* both are acceptable outcomes... */ |
|
827 rc = ((rc == Z_OK) || (rc == Z_STREAM_END)); |
|
828 } /* if */ |
|
829 } /* if */ |
|
830 __PHYSFS_smallFree(compressed); |
|
831 } /* if */ |
|
832 } /* else */ |
|
833 |
|
834 if (rc) |
|
835 { |
|
836 path[entry->uncompressed_size] = '\0'; /* null-terminate it. */ |
|
837 zip_convert_dos_path(entry, path); |
|
838 entry->symlink = zip_follow_symlink(io, info, path); |
|
839 } /* else */ |
|
840 |
|
841 __PHYSFS_smallFree(path); |
|
842 |
|
843 return (entry->symlink != NULL); |
|
844 } /* zip_resolve_symlink */ |
|
845 |
|
846 |
|
847 /* |
|
848 * Parse the local file header of an entry, and update entry->offset. |
|
849 */ |
|
850 static int zip_parse_local(PHYSFS_Io *io, ZIPentry *entry) |
|
851 { |
|
852 PHYSFS_uint32 ui32; |
|
853 PHYSFS_uint16 ui16; |
|
854 PHYSFS_uint16 fnamelen; |
|
855 PHYSFS_uint16 extralen; |
|
856 |
|
857 /* |
|
858 * crc and (un)compressed_size are always zero if this is a "JAR" |
|
859 * archive created with Sun's Java tools, apparently. We only |
|
860 * consider this archive corrupted if those entries don't match and |
|
861 * aren't zero. That seems to work well. |
|
862 * We also ignore a mismatch if the value is 0xFFFFFFFF here, since it's |
|
863 * possible that's a Zip64 thing. |
|
864 */ |
|
865 |
|
866 /* !!! FIXME: apparently these are zero if general purpose bit 3 is set, |
|
867 !!! FIXME: which is probably true for Jar files, fwiw, but we don't |
|
868 !!! FIXME: care about these values anyhow. */ |
|
869 |
|
870 BAIL_IF_MACRO(!io->seek(io, entry->offset), ERRPASS, 0); |
|
871 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); |
|
872 BAIL_IF_MACRO(ui32 != ZIP_LOCAL_FILE_SIG, PHYSFS_ERR_CORRUPT, 0); |
|
873 BAIL_IF_MACRO(!readui16(io, &ui16), ERRPASS, 0); |
|
874 BAIL_IF_MACRO(ui16 != entry->version_needed, PHYSFS_ERR_CORRUPT, 0); |
|
875 BAIL_IF_MACRO(!readui16(io, &ui16), ERRPASS, 0); /* general bits. */ |
|
876 BAIL_IF_MACRO(!readui16(io, &ui16), ERRPASS, 0); |
|
877 BAIL_IF_MACRO(ui16 != entry->compression_method, PHYSFS_ERR_CORRUPT, 0); |
|
878 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); /* date/time */ |
|
879 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); |
|
880 BAIL_IF_MACRO(ui32 && (ui32 != entry->crc), PHYSFS_ERR_CORRUPT, 0); |
|
881 |
|
882 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); |
|
883 BAIL_IF_MACRO(ui32 && (ui32 != 0xFFFFFFFF) && |
|
884 (ui32 != entry->compressed_size), PHYSFS_ERR_CORRUPT, 0); |
|
885 |
|
886 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); |
|
887 BAIL_IF_MACRO(ui32 && (ui32 != 0xFFFFFFFF) && |
|
888 (ui32 != entry->uncompressed_size), PHYSFS_ERR_CORRUPT, 0); |
|
889 |
|
890 BAIL_IF_MACRO(!readui16(io, &fnamelen), ERRPASS, 0); |
|
891 BAIL_IF_MACRO(!readui16(io, &extralen), ERRPASS, 0); |
|
892 |
|
893 entry->offset += fnamelen + extralen + 30; |
|
894 return 1; |
|
895 } /* zip_parse_local */ |
|
896 |
|
897 |
|
898 static int zip_resolve(PHYSFS_Io *io, ZIPinfo *info, ZIPentry *entry) |
|
899 { |
|
900 int retval = 1; |
|
901 const ZipResolveType resolve_type = entry->resolved; |
|
902 |
|
903 if (resolve_type == ZIP_DIRECTORY) |
|
904 return 1; /* we're good. */ |
|
905 |
|
906 /* Don't bother if we've failed to resolve this entry before. */ |
|
907 BAIL_IF_MACRO(resolve_type == ZIP_BROKEN_FILE, PHYSFS_ERR_CORRUPT, 0); |
|
908 BAIL_IF_MACRO(resolve_type == ZIP_BROKEN_SYMLINK, PHYSFS_ERR_CORRUPT, 0); |
|
909 |
|
910 /* uhoh...infinite symlink loop! */ |
|
911 BAIL_IF_MACRO(resolve_type == ZIP_RESOLVING, PHYSFS_ERR_SYMLINK_LOOP, 0); |
|
912 |
|
913 /* |
|
914 * We fix up the offset to point to the actual data on the |
|
915 * first open, since we don't want to seek across the whole file on |
|
916 * archive open (can be SLOW on large, CD-stored files), but we |
|
917 * need to check the local file header...not just for corruption, |
|
918 * but since it stores offset info the central directory does not. |
|
919 */ |
|
920 if (resolve_type != ZIP_RESOLVED) |
|
921 { |
|
922 entry->resolved = ZIP_RESOLVING; |
|
923 |
|
924 retval = zip_parse_local(io, entry); |
|
925 if (retval) |
|
926 { |
|
927 /* |
|
928 * If it's a symlink, find the original file. This will cause |
|
929 * resolution of other entries (other symlinks and, eventually, |
|
930 * the real file) if all goes well. |
|
931 */ |
|
932 if (resolve_type == ZIP_UNRESOLVED_SYMLINK) |
|
933 retval = zip_resolve_symlink(io, info, entry); |
|
934 } /* if */ |
|
935 |
|
936 if (resolve_type == ZIP_UNRESOLVED_SYMLINK) |
|
937 entry->resolved = ((retval) ? ZIP_RESOLVED : ZIP_BROKEN_SYMLINK); |
|
938 else if (resolve_type == ZIP_UNRESOLVED_FILE) |
|
939 entry->resolved = ((retval) ? ZIP_RESOLVED : ZIP_BROKEN_FILE); |
|
940 } /* if */ |
|
941 |
|
942 return retval; |
|
943 } /* zip_resolve */ |
|
944 |
|
945 |
|
946 static int zip_hash_entry(ZIPinfo *info, ZIPentry *entry); |
|
947 |
|
948 /* Fill in missing parent directories. */ |
|
949 static ZIPentry *zip_hash_ancestors(ZIPinfo *info, char *name) |
|
950 { |
|
951 ZIPentry *retval = &info->root; |
|
952 char *sep = strrchr(name, '/'); |
|
953 |
|
954 if (sep) |
|
955 { |
|
956 const size_t namelen = (sep - name) + 1; |
|
957 |
|
958 *sep = '\0'; /* chop off last piece. */ |
|
959 retval = zip_find_entry(info, name); |
|
960 *sep = '/'; |
|
961 |
|
962 if (retval != NULL) |
|
963 { |
|
964 if (retval->resolved != ZIP_DIRECTORY) |
|
965 BAIL_MACRO(PHYSFS_ERR_CORRUPT, NULL); |
|
966 return retval; /* already hashed. */ |
|
967 } /* if */ |
|
968 |
|
969 /* okay, this is a new dir. Build and hash us. */ |
|
970 retval = (ZIPentry *) allocator.Malloc(sizeof (ZIPentry) + namelen); |
|
971 BAIL_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, NULL); |
|
972 memset(retval, '\0', sizeof (*retval)); |
|
973 retval->name = ((char *) retval) + sizeof (ZIPentry); |
|
974 memcpy(retval->name, name, namelen - 1); |
|
975 retval->name[namelen - 1] = '\0'; |
|
976 retval->resolved = ZIP_DIRECTORY; |
|
977 if (!zip_hash_entry(info, retval)) |
|
978 { |
|
979 allocator.Free(retval); |
|
980 return NULL; |
|
981 } /* if */ |
|
982 } /* else */ |
|
983 |
|
984 return retval; |
|
985 } /* zip_hash_ancestors */ |
|
986 |
|
987 |
|
988 static int zip_hash_entry(ZIPinfo *info, ZIPentry *entry) |
|
989 { |
|
990 PHYSFS_uint32 hashval; |
|
991 ZIPentry *parent; |
|
992 |
|
993 assert(!zip_find_entry(info, entry->name)); /* checked elsewhere */ |
|
994 |
|
995 parent = zip_hash_ancestors(info, entry->name); |
|
996 if (!parent) |
|
997 return 0; |
|
998 |
|
999 hashval = zip_hash_string(info, entry->name); |
|
1000 entry->hashnext = info->hash[hashval]; |
|
1001 info->hash[hashval] = entry; |
|
1002 |
|
1003 entry->sibling = parent->children; |
|
1004 parent->children = entry; |
|
1005 return 1; |
|
1006 } /* zip_hash_entry */ |
|
1007 |
|
1008 |
|
1009 static int zip_entry_is_symlink(const ZIPentry *entry) |
|
1010 { |
|
1011 return ((entry->resolved == ZIP_UNRESOLVED_SYMLINK) || |
|
1012 (entry->resolved == ZIP_BROKEN_SYMLINK) || |
|
1013 (entry->symlink)); |
|
1014 } /* zip_entry_is_symlink */ |
|
1015 |
|
1016 |
|
1017 static int zip_version_does_symlinks(PHYSFS_uint32 version) |
|
1018 { |
|
1019 int retval = 0; |
|
1020 PHYSFS_uint8 hosttype = (PHYSFS_uint8) ((version >> 8) & 0xFF); |
|
1021 |
|
1022 switch (hosttype) |
|
1023 { |
|
1024 /* |
|
1025 * These are the platforms that can NOT build an archive with |
|
1026 * symlinks, according to the Info-ZIP project. |
|
1027 */ |
|
1028 case 0: /* FS_FAT_ */ |
|
1029 case 1: /* AMIGA_ */ |
|
1030 case 2: /* VMS_ */ |
|
1031 case 4: /* VM_CSM_ */ |
|
1032 case 6: /* FS_HPFS_ */ |
|
1033 case 11: /* FS_NTFS_ */ |
|
1034 case 14: /* FS_VFAT_ */ |
|
1035 case 13: /* ACORN_ */ |
|
1036 case 15: /* MVS_ */ |
|
1037 case 18: /* THEOS_ */ |
|
1038 break; /* do nothing. */ |
|
1039 |
|
1040 default: /* assume the rest to be unix-like. */ |
|
1041 retval = 1; |
|
1042 break; |
|
1043 } /* switch */ |
|
1044 |
|
1045 return retval; |
|
1046 } /* zip_version_does_symlinks */ |
|
1047 |
|
1048 |
|
1049 static int zip_has_symlink_attr(ZIPentry *entry, PHYSFS_uint32 extern_attr) |
|
1050 { |
|
1051 PHYSFS_uint16 xattr = ((extern_attr >> 16) & 0xFFFF); |
|
1052 return ( (zip_version_does_symlinks(entry->version)) && |
|
1053 (entry->uncompressed_size > 0) && |
|
1054 ((xattr & UNIX_FILETYPE_MASK) == UNIX_FILETYPE_SYMLINK) ); |
|
1055 } /* zip_has_symlink_attr */ |
|
1056 |
|
1057 |
|
1058 static PHYSFS_sint64 zip_dos_time_to_physfs_time(PHYSFS_uint32 dostime) |
|
1059 { |
|
1060 PHYSFS_uint32 dosdate; |
|
1061 struct tm unixtime; |
|
1062 memset(&unixtime, '\0', sizeof (unixtime)); |
|
1063 |
|
1064 dosdate = (PHYSFS_uint32) ((dostime >> 16) & 0xFFFF); |
|
1065 dostime &= 0xFFFF; |
|
1066 |
|
1067 /* dissect date */ |
|
1068 unixtime.tm_year = ((dosdate >> 9) & 0x7F) + 80; |
|
1069 unixtime.tm_mon = ((dosdate >> 5) & 0x0F) - 1; |
|
1070 unixtime.tm_mday = ((dosdate ) & 0x1F); |
|
1071 |
|
1072 /* dissect time */ |
|
1073 unixtime.tm_hour = ((dostime >> 11) & 0x1F); |
|
1074 unixtime.tm_min = ((dostime >> 5) & 0x3F); |
|
1075 unixtime.tm_sec = ((dostime << 1) & 0x3E); |
|
1076 |
|
1077 /* let mktime calculate daylight savings time. */ |
|
1078 unixtime.tm_isdst = -1; |
|
1079 |
|
1080 return ((PHYSFS_sint64) mktime(&unixtime)); |
|
1081 } /* zip_dos_time_to_physfs_time */ |
|
1082 |
|
1083 |
|
1084 static ZIPentry *zip_load_entry(PHYSFS_Io *io, const int zip64, |
|
1085 const PHYSFS_uint64 ofs_fixup) |
|
1086 { |
|
1087 ZIPentry entry; |
|
1088 ZIPentry *retval = NULL; |
|
1089 PHYSFS_uint16 fnamelen, extralen, commentlen; |
|
1090 PHYSFS_uint32 external_attr; |
|
1091 PHYSFS_uint32 starting_disk; |
|
1092 PHYSFS_uint64 offset; |
|
1093 PHYSFS_uint16 ui16; |
|
1094 PHYSFS_uint32 ui32; |
|
1095 PHYSFS_sint64 si64; |
|
1096 |
|
1097 memset(&entry, '\0', sizeof (entry)); |
|
1098 |
|
1099 /* sanity check with central directory signature... */ |
|
1100 if (!readui32(io, &ui32)) return NULL; |
|
1101 BAIL_IF_MACRO(ui32 != ZIP_CENTRAL_DIR_SIG, PHYSFS_ERR_CORRUPT, NULL); |
|
1102 |
|
1103 /* Get the pertinent parts of the record... */ |
|
1104 if (!readui16(io, &entry.version)) return NULL; |
|
1105 if (!readui16(io, &entry.version_needed)) return NULL; |
|
1106 if (!readui16(io, &entry.general_bits)) return NULL; /* general bits */ |
|
1107 if (!readui16(io, &entry.compression_method)) return NULL; |
|
1108 if (!readui32(io, &entry.dos_mod_time)) return NULL; |
|
1109 entry.last_mod_time = zip_dos_time_to_physfs_time(entry.dos_mod_time); |
|
1110 if (!readui32(io, &entry.crc)) return NULL; |
|
1111 if (!readui32(io, &ui32)) return NULL; |
|
1112 entry.compressed_size = (PHYSFS_uint64) ui32; |
|
1113 if (!readui32(io, &ui32)) return NULL; |
|
1114 entry.uncompressed_size = (PHYSFS_uint64) ui32; |
|
1115 if (!readui16(io, &fnamelen)) return NULL; |
|
1116 if (!readui16(io, &extralen)) return NULL; |
|
1117 if (!readui16(io, &commentlen)) return NULL; |
|
1118 if (!readui16(io, &ui16)) return NULL; |
|
1119 starting_disk = (PHYSFS_uint32) ui16; |
|
1120 if (!readui16(io, &ui16)) return NULL; /* internal file attribs */ |
|
1121 if (!readui32(io, &external_attr)) return NULL; |
|
1122 if (!readui32(io, &ui32)) return NULL; |
|
1123 offset = (PHYSFS_uint64) ui32; |
|
1124 |
|
1125 retval = (ZIPentry *) allocator.Malloc(sizeof (ZIPentry) + fnamelen + 1); |
|
1126 BAIL_IF_MACRO(retval == NULL, PHYSFS_ERR_OUT_OF_MEMORY, 0); |
|
1127 memcpy(retval, &entry, sizeof (*retval)); |
|
1128 retval->name = ((char *) retval) + sizeof (ZIPentry); |
|
1129 |
|
1130 if (!__PHYSFS_readAll(io, retval->name, fnamelen)) |
|
1131 goto zip_load_entry_puked; |
|
1132 |
|
1133 retval->name[fnamelen] = '\0'; /* null-terminate the filename. */ |
|
1134 zip_convert_dos_path(retval, retval->name); |
|
1135 |
|
1136 retval->symlink = NULL; /* will be resolved later, if necessary. */ |
|
1137 |
|
1138 if (retval->name[fnamelen - 1] == '/') |
|
1139 { |
|
1140 retval->name[fnamelen - 1] = '\0'; |
|
1141 retval->resolved = ZIP_DIRECTORY; |
|
1142 } /* if */ |
|
1143 else |
|
1144 { |
|
1145 retval->resolved = (zip_has_symlink_attr(&entry, external_attr)) ? |
|
1146 ZIP_UNRESOLVED_SYMLINK : ZIP_UNRESOLVED_FILE; |
|
1147 } /* else */ |
|
1148 |
|
1149 si64 = io->tell(io); |
|
1150 if (si64 == -1) |
|
1151 goto zip_load_entry_puked; |
|
1152 |
|
1153 /* |
|
1154 * The actual sizes didn't fit in 32-bits; look for the Zip64 |
|
1155 * extended information extra field... |
|
1156 */ |
|
1157 if ( (zip64) && |
|
1158 ((offset == 0xFFFFFFFF) || |
|
1159 (starting_disk == 0xFFFFFFFF) || |
|
1160 (retval->compressed_size == 0xFFFFFFFF) || |
|
1161 (retval->uncompressed_size == 0xFFFFFFFF)) ) |
|
1162 { |
|
1163 int found = 0; |
|
1164 PHYSFS_uint16 sig, len; |
|
1165 while (extralen > 4) |
|
1166 { |
|
1167 if (!readui16(io, &sig)) |
|
1168 goto zip_load_entry_puked; |
|
1169 else if (!readui16(io, &len)) |
|
1170 goto zip_load_entry_puked; |
|
1171 |
|
1172 si64 += 4 + len; |
|
1173 extralen -= 4 + len; |
|
1174 if (sig != ZIP64_EXTENDED_INFO_EXTRA_FIELD_SIG) |
|
1175 { |
|
1176 if (!io->seek(io, si64)) |
|
1177 goto zip_load_entry_puked; |
|
1178 continue; |
|
1179 } /* if */ |
|
1180 |
|
1181 found = 1; |
|
1182 break; |
|
1183 } /* while */ |
|
1184 |
|
1185 GOTO_IF_MACRO(!found, PHYSFS_ERR_CORRUPT, zip_load_entry_puked); |
|
1186 |
|
1187 if (retval->uncompressed_size == 0xFFFFFFFF) |
|
1188 { |
|
1189 GOTO_IF_MACRO(len < 8, PHYSFS_ERR_CORRUPT, zip_load_entry_puked); |
|
1190 if (!readui64(io, &retval->uncompressed_size)) |
|
1191 goto zip_load_entry_puked; |
|
1192 len -= 8; |
|
1193 } /* if */ |
|
1194 |
|
1195 if (retval->compressed_size == 0xFFFFFFFF) |
|
1196 { |
|
1197 GOTO_IF_MACRO(len < 8, PHYSFS_ERR_CORRUPT, zip_load_entry_puked); |
|
1198 if (!readui64(io, &retval->compressed_size)) |
|
1199 goto zip_load_entry_puked; |
|
1200 len -= 8; |
|
1201 } /* if */ |
|
1202 |
|
1203 if (offset == 0xFFFFFFFF) |
|
1204 { |
|
1205 GOTO_IF_MACRO(len < 8, PHYSFS_ERR_CORRUPT, zip_load_entry_puked); |
|
1206 if (!readui64(io, &offset)) |
|
1207 goto zip_load_entry_puked; |
|
1208 len -= 8; |
|
1209 } /* if */ |
|
1210 |
|
1211 if (starting_disk == 0xFFFFFFFF) |
|
1212 { |
|
1213 GOTO_IF_MACRO(len < 8, PHYSFS_ERR_CORRUPT, zip_load_entry_puked); |
|
1214 if (!readui32(io, &starting_disk)) |
|
1215 goto zip_load_entry_puked; |
|
1216 len -= 4; |
|
1217 } /* if */ |
|
1218 |
|
1219 GOTO_IF_MACRO(len != 0, PHYSFS_ERR_CORRUPT, zip_load_entry_puked); |
|
1220 } /* if */ |
|
1221 |
|
1222 GOTO_IF_MACRO(starting_disk != 0, PHYSFS_ERR_CORRUPT, zip_load_entry_puked); |
|
1223 |
|
1224 retval->offset = offset + ofs_fixup; |
|
1225 |
|
1226 /* seek to the start of the next entry in the central directory... */ |
|
1227 if (!io->seek(io, si64 + extralen + commentlen)) |
|
1228 goto zip_load_entry_puked; |
|
1229 |
|
1230 return retval; /* success. */ |
|
1231 |
|
1232 zip_load_entry_puked: |
|
1233 allocator.Free(retval); |
|
1234 return NULL; /* failure. */ |
|
1235 } /* zip_load_entry */ |
|
1236 |
|
1237 |
|
1238 /* This leaves things allocated on error; the caller will clean up the mess. */ |
|
1239 static int zip_load_entries(ZIPinfo *info, |
|
1240 const PHYSFS_uint64 data_ofs, |
|
1241 const PHYSFS_uint64 central_ofs, |
|
1242 const PHYSFS_uint64 entry_count) |
|
1243 { |
|
1244 PHYSFS_Io *io = info->io; |
|
1245 const int zip64 = info->zip64; |
|
1246 PHYSFS_uint64 i; |
|
1247 |
|
1248 if (!io->seek(io, central_ofs)) |
|
1249 return 0; |
|
1250 |
|
1251 for (i = 0; i < entry_count; i++) |
|
1252 { |
|
1253 ZIPentry *entry = zip_load_entry(io, zip64, data_ofs); |
|
1254 ZIPentry *find; |
|
1255 |
|
1256 if (!entry) |
|
1257 return 0; |
|
1258 |
|
1259 find = zip_find_entry(info, entry->name); |
|
1260 if (find != NULL) /* duplicate? */ |
|
1261 { |
|
1262 if (find->last_mod_time != 0) /* duplicate? */ |
|
1263 { |
|
1264 allocator.Free(entry); |
|
1265 BAIL_MACRO(PHYSFS_ERR_CORRUPT, 0); |
|
1266 } /* if */ |
|
1267 else /* we filled this in as a placeholder. Update it. */ |
|
1268 { |
|
1269 find->offset = entry->offset; |
|
1270 find->version = entry->version; |
|
1271 find->version_needed = entry->version_needed; |
|
1272 find->compression_method = entry->compression_method; |
|
1273 find->crc = entry->crc; |
|
1274 find->compressed_size = entry->compressed_size; |
|
1275 find->uncompressed_size = entry->uncompressed_size; |
|
1276 find->last_mod_time = entry->last_mod_time; |
|
1277 allocator.Free(entry); |
|
1278 continue; |
|
1279 } /* else */ |
|
1280 } /* if */ |
|
1281 |
|
1282 if (!zip_hash_entry(info, entry)) |
|
1283 { |
|
1284 allocator.Free(entry); |
|
1285 return 0; |
|
1286 } /* if */ |
|
1287 |
|
1288 if (zip_entry_is_tradional_crypto(entry)) |
|
1289 info->has_crypto = 1; |
|
1290 } /* for */ |
|
1291 |
|
1292 return 1; |
|
1293 } /* zip_load_entries */ |
|
1294 |
|
1295 |
|
1296 static PHYSFS_sint64 zip64_find_end_of_central_dir(PHYSFS_Io *io, |
|
1297 PHYSFS_sint64 _pos, |
|
1298 PHYSFS_uint64 offset) |
|
1299 { |
|
1300 /* |
|
1301 * Naturally, the offset is useless to us; it is the offset from the |
|
1302 * start of file, which is meaningless if we've appended this .zip to |
|
1303 * a self-extracting .exe. We need to find this on our own. It should |
|
1304 * be directly before the locator record, but the record in question, |
|
1305 * like the original end-of-central-directory record, ends with a |
|
1306 * variable-length field. Unlike the original, which has to store the |
|
1307 * size of that variable-length field in a 16-bit int and thus has to be |
|
1308 * within 64k, the new one gets 64-bits. |
|
1309 * |
|
1310 * Fortunately, the only currently-specified record for that variable |
|
1311 * length block is some weird proprietary thing that deals with EBCDIC |
|
1312 * and tape backups or something. So we don't seek far. |
|
1313 */ |
|
1314 |
|
1315 PHYSFS_uint32 ui32; |
|
1316 const PHYSFS_uint64 pos = (PHYSFS_uint64) _pos; |
|
1317 |
|
1318 assert(_pos > 0); |
|
1319 |
|
1320 /* Try offset specified in the Zip64 end of central directory locator. */ |
|
1321 /* This works if the entire PHYSFS_Io is the zip file. */ |
|
1322 BAIL_IF_MACRO(!io->seek(io, offset), ERRPASS, -1); |
|
1323 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, -1); |
|
1324 if (ui32 == ZIP64_END_OF_CENTRAL_DIR_SIG) |
|
1325 return offset; |
|
1326 |
|
1327 /* Try 56 bytes before the Zip64 end of central directory locator. */ |
|
1328 /* This works if the record isn't variable length and is version 1. */ |
|
1329 if (pos > 56) |
|
1330 { |
|
1331 BAIL_IF_MACRO(!io->seek(io, pos-56), ERRPASS, -1); |
|
1332 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, -1); |
|
1333 if (ui32 == ZIP64_END_OF_CENTRAL_DIR_SIG) |
|
1334 return pos-56; |
|
1335 } /* if */ |
|
1336 |
|
1337 /* Try 84 bytes before the Zip64 end of central directory locator. */ |
|
1338 /* This works if the record isn't variable length and is version 2. */ |
|
1339 if (pos > 84) |
|
1340 { |
|
1341 BAIL_IF_MACRO(!io->seek(io, pos-84), ERRPASS, -1); |
|
1342 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, -1); |
|
1343 if (ui32 == ZIP64_END_OF_CENTRAL_DIR_SIG) |
|
1344 return pos-84; |
|
1345 } /* if */ |
|
1346 |
|
1347 /* Ok, brute force: we know it's between (offset) and (pos) somewhere. */ |
|
1348 /* Just try moving back at most 256k. Oh well. */ |
|
1349 if ((offset < pos) && (pos > 4)) |
|
1350 { |
|
1351 const PHYSFS_uint64 maxbuflen = 256 * 1024; |
|
1352 PHYSFS_uint64 len = pos - offset; |
|
1353 PHYSFS_uint8 *buf = NULL; |
|
1354 PHYSFS_sint32 i; |
|
1355 |
|
1356 if (len > maxbuflen) |
|
1357 len = maxbuflen; |
|
1358 |
|
1359 buf = (PHYSFS_uint8 *) __PHYSFS_smallAlloc(len); |
|
1360 BAIL_IF_MACRO(!buf, PHYSFS_ERR_OUT_OF_MEMORY, -1); |
|
1361 |
|
1362 if (!io->seek(io, pos - len) || !__PHYSFS_readAll(io, buf, len)) |
|
1363 { |
|
1364 __PHYSFS_smallFree(buf); |
|
1365 return -1; /* error was set elsewhere. */ |
|
1366 } /* if */ |
|
1367 |
|
1368 for (i = (PHYSFS_sint32) (len - 4); i >= 0; i--) |
|
1369 { |
|
1370 if ( (buf[i] == 0x50) && (buf[i+1] == 0x4b) && |
|
1371 (buf[i+2] == 0x06) && (buf[i+3] == 0x06) ) |
|
1372 { |
|
1373 __PHYSFS_smallFree(buf); |
|
1374 return pos - (len - i); |
|
1375 } /* if */ |
|
1376 } /* for */ |
|
1377 |
|
1378 __PHYSFS_smallFree(buf); |
|
1379 } /* if */ |
|
1380 |
|
1381 BAIL_MACRO(PHYSFS_ERR_CORRUPT, -1); /* didn't find it. */ |
|
1382 } /* zip64_find_end_of_central_dir */ |
|
1383 |
|
1384 |
|
1385 static int zip64_parse_end_of_central_dir(ZIPinfo *info, |
|
1386 PHYSFS_uint64 *data_start, |
|
1387 PHYSFS_uint64 *dir_ofs, |
|
1388 PHYSFS_uint64 *entry_count, |
|
1389 PHYSFS_sint64 pos) |
|
1390 { |
|
1391 PHYSFS_Io *io = info->io; |
|
1392 PHYSFS_uint64 ui64; |
|
1393 PHYSFS_uint32 ui32; |
|
1394 PHYSFS_uint16 ui16; |
|
1395 |
|
1396 /* We should be positioned right past the locator signature. */ |
|
1397 |
|
1398 if ((pos < 0) || (!io->seek(io, pos))) |
|
1399 return 0; |
|
1400 |
|
1401 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); |
|
1402 if (ui32 != ZIP64_END_OF_CENTRAL_DIRECTORY_LOCATOR_SIG) |
|
1403 return -1; /* it's not a Zip64 archive. Not an error, though! */ |
|
1404 |
|
1405 info->zip64 = 1; |
|
1406 |
|
1407 /* number of the disk with the start of the central directory. */ |
|
1408 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); |
|
1409 BAIL_IF_MACRO(ui32 != 0, PHYSFS_ERR_CORRUPT, 0); |
|
1410 |
|
1411 /* offset of Zip64 end of central directory record. */ |
|
1412 BAIL_IF_MACRO(!readui64(io, &ui64), ERRPASS, 0); |
|
1413 |
|
1414 /* total number of disks */ |
|
1415 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); |
|
1416 BAIL_IF_MACRO(ui32 != 1, PHYSFS_ERR_CORRUPT, 0); |
|
1417 |
|
1418 pos = zip64_find_end_of_central_dir(io, pos, ui64); |
|
1419 if (pos < 0) |
|
1420 return 0; /* oh well. */ |
|
1421 |
|
1422 /* |
|
1423 * For self-extracting archives, etc, there's crapola in the file |
|
1424 * before the zipfile records; we calculate how much data there is |
|
1425 * prepended by determining how far the zip64-end-of-central-directory |
|
1426 * offset is from where it is supposed to be...the difference in bytes |
|
1427 * is how much arbitrary data is at the start of the physical file. |
|
1428 */ |
|
1429 assert(((PHYSFS_uint64) pos) >= ui64); |
|
1430 *data_start = ((PHYSFS_uint64) pos) - ui64; |
|
1431 |
|
1432 BAIL_IF_MACRO(!io->seek(io, pos), ERRPASS, 0); |
|
1433 |
|
1434 /* check signature again, just in case. */ |
|
1435 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); |
|
1436 BAIL_IF_MACRO(ui32 != ZIP64_END_OF_CENTRAL_DIR_SIG, PHYSFS_ERR_CORRUPT, 0); |
|
1437 |
|
1438 /* size of Zip64 end of central directory record. */ |
|
1439 BAIL_IF_MACRO(!readui64(io, &ui64), ERRPASS, 0); |
|
1440 |
|
1441 /* version made by. */ |
|
1442 BAIL_IF_MACRO(!readui16(io, &ui16), ERRPASS, 0); |
|
1443 |
|
1444 /* version needed to extract. */ |
|
1445 BAIL_IF_MACRO(!readui16(io, &ui16), ERRPASS, 0); |
|
1446 |
|
1447 /* number of this disk. */ |
|
1448 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); |
|
1449 BAIL_IF_MACRO(ui32 != 0, PHYSFS_ERR_CORRUPT, 0); |
|
1450 |
|
1451 /* number of disk with start of central directory record. */ |
|
1452 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); |
|
1453 BAIL_IF_MACRO(ui32 != 0, PHYSFS_ERR_CORRUPT, 0); |
|
1454 |
|
1455 /* total number of entries in the central dir on this disk */ |
|
1456 BAIL_IF_MACRO(!readui64(io, &ui64), ERRPASS, 0); |
|
1457 |
|
1458 /* total number of entries in the central dir */ |
|
1459 BAIL_IF_MACRO(!readui64(io, entry_count), ERRPASS, 0); |
|
1460 BAIL_IF_MACRO(ui64 != *entry_count, PHYSFS_ERR_CORRUPT, 0); |
|
1461 |
|
1462 /* size of the central directory */ |
|
1463 BAIL_IF_MACRO(!readui64(io, &ui64), ERRPASS, 0); |
|
1464 |
|
1465 /* offset of central directory */ |
|
1466 BAIL_IF_MACRO(!readui64(io, dir_ofs), ERRPASS, 0); |
|
1467 |
|
1468 /* Since we know the difference, fix up the central dir offset... */ |
|
1469 *dir_ofs += *data_start; |
|
1470 |
|
1471 /* |
|
1472 * There are more fields here, for encryption and feature-specific things, |
|
1473 * but we don't care about any of them at the moment. |
|
1474 */ |
|
1475 |
|
1476 return 1; /* made it. */ |
|
1477 } /* zip64_parse_end_of_central_dir */ |
|
1478 |
|
1479 |
|
1480 static int zip_parse_end_of_central_dir(ZIPinfo *info, |
|
1481 PHYSFS_uint64 *data_start, |
|
1482 PHYSFS_uint64 *dir_ofs, |
|
1483 PHYSFS_uint64 *entry_count) |
|
1484 { |
|
1485 PHYSFS_Io *io = info->io; |
|
1486 PHYSFS_uint16 entryCount16; |
|
1487 PHYSFS_uint32 offset32; |
|
1488 PHYSFS_uint32 ui32; |
|
1489 PHYSFS_uint16 ui16; |
|
1490 PHYSFS_sint64 len; |
|
1491 PHYSFS_sint64 pos; |
|
1492 int rc; |
|
1493 |
|
1494 /* find the end-of-central-dir record, and seek to it. */ |
|
1495 pos = zip_find_end_of_central_dir(io, &len); |
|
1496 BAIL_IF_MACRO(pos == -1, ERRPASS, 0); |
|
1497 BAIL_IF_MACRO(!io->seek(io, pos), ERRPASS, 0); |
|
1498 |
|
1499 /* check signature again, just in case. */ |
|
1500 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); |
|
1501 BAIL_IF_MACRO(ui32 != ZIP_END_OF_CENTRAL_DIR_SIG, PHYSFS_ERR_CORRUPT, 0); |
|
1502 |
|
1503 /* Seek back to see if "Zip64 end of central directory locator" exists. */ |
|
1504 /* this record is 20 bytes before end-of-central-dir */ |
|
1505 rc = zip64_parse_end_of_central_dir(info, data_start, dir_ofs, |
|
1506 entry_count, pos - 20); |
|
1507 |
|
1508 /* Error or success? Bounce out of here. Keep going if not zip64. */ |
|
1509 if ((rc == 0) || (rc == 1)) |
|
1510 return rc; |
|
1511 |
|
1512 assert(rc == -1); /* no error, just not a Zip64 archive. */ |
|
1513 |
|
1514 /* Not Zip64? Seek back to where we were and keep processing. */ |
|
1515 BAIL_IF_MACRO(!io->seek(io, pos + 4), ERRPASS, 0); |
|
1516 |
|
1517 /* number of this disk */ |
|
1518 BAIL_IF_MACRO(!readui16(io, &ui16), ERRPASS, 0); |
|
1519 BAIL_IF_MACRO(ui16 != 0, PHYSFS_ERR_CORRUPT, 0); |
|
1520 |
|
1521 /* number of the disk with the start of the central directory */ |
|
1522 BAIL_IF_MACRO(!readui16(io, &ui16), ERRPASS, 0); |
|
1523 BAIL_IF_MACRO(ui16 != 0, PHYSFS_ERR_CORRUPT, 0); |
|
1524 |
|
1525 /* total number of entries in the central dir on this disk */ |
|
1526 BAIL_IF_MACRO(!readui16(io, &ui16), ERRPASS, 0); |
|
1527 |
|
1528 /* total number of entries in the central dir */ |
|
1529 BAIL_IF_MACRO(!readui16(io, &entryCount16), ERRPASS, 0); |
|
1530 BAIL_IF_MACRO(ui16 != entryCount16, PHYSFS_ERR_CORRUPT, 0); |
|
1531 |
|
1532 *entry_count = entryCount16; |
|
1533 |
|
1534 /* size of the central directory */ |
|
1535 BAIL_IF_MACRO(!readui32(io, &ui32), ERRPASS, 0); |
|
1536 |
|
1537 /* offset of central directory */ |
|
1538 BAIL_IF_MACRO(!readui32(io, &offset32), ERRPASS, 0); |
|
1539 *dir_ofs = (PHYSFS_uint64) offset32; |
|
1540 BAIL_IF_MACRO(pos < (*dir_ofs + ui32), PHYSFS_ERR_CORRUPT, 0); |
|
1541 |
|
1542 /* |
|
1543 * For self-extracting archives, etc, there's crapola in the file |
|
1544 * before the zipfile records; we calculate how much data there is |
|
1545 * prepended by determining how far the central directory offset is |
|
1546 * from where it is supposed to be (start of end-of-central-dir minus |
|
1547 * sizeof central dir)...the difference in bytes is how much arbitrary |
|
1548 * data is at the start of the physical file. |
|
1549 */ |
|
1550 *data_start = (PHYSFS_uint64) (pos - (*dir_ofs + ui32)); |
|
1551 |
|
1552 /* Now that we know the difference, fix up the central dir offset... */ |
|
1553 *dir_ofs += *data_start; |
|
1554 |
|
1555 /* zipfile comment length */ |
|
1556 BAIL_IF_MACRO(!readui16(io, &ui16), ERRPASS, 0); |
|
1557 |
|
1558 /* |
|
1559 * Make sure that the comment length matches to the end of file... |
|
1560 * If it doesn't, we're either in the wrong part of the file, or the |
|
1561 * file is corrupted, but we give up either way. |
|
1562 */ |
|
1563 BAIL_IF_MACRO((pos + 22 + ui16) != len, PHYSFS_ERR_CORRUPT, 0); |
|
1564 |
|
1565 return 1; /* made it. */ |
|
1566 } /* zip_parse_end_of_central_dir */ |
|
1567 |
|
1568 |
|
1569 static int zip_alloc_hashtable(ZIPinfo *info, const PHYSFS_uint64 entry_count) |
|
1570 { |
|
1571 size_t alloclen; |
|
1572 |
|
1573 info->hashBuckets = (size_t) (entry_count / 5); |
|
1574 if (!info->hashBuckets) |
|
1575 info->hashBuckets = 1; |
|
1576 |
|
1577 alloclen = info->hashBuckets * sizeof (ZIPentry *); |
|
1578 info->hash = (ZIPentry **) allocator.Malloc(alloclen); |
|
1579 BAIL_IF_MACRO(!info->hash, PHYSFS_ERR_OUT_OF_MEMORY, 0); |
|
1580 memset(info->hash, '\0', alloclen); |
|
1581 |
|
1582 return 1; |
|
1583 } /* zip_alloc_hashtable */ |
|
1584 |
|
1585 static void ZIP_closeArchive(void *opaque); |
|
1586 |
|
1587 static void *ZIP_openArchive(PHYSFS_Io *io, const char *name, int forWriting) |
|
1588 { |
|
1589 ZIPinfo *info = NULL; |
|
1590 PHYSFS_uint64 dstart; /* data start */ |
|
1591 PHYSFS_uint64 cdir_ofs; /* central dir offset */ |
|
1592 PHYSFS_uint64 entry_count; |
|
1593 |
|
1594 assert(io != NULL); /* shouldn't ever happen. */ |
|
1595 |
|
1596 BAIL_IF_MACRO(forWriting, PHYSFS_ERR_READ_ONLY, NULL); |
|
1597 BAIL_IF_MACRO(!isZip(io), ERRPASS, NULL); |
|
1598 |
|
1599 info = (ZIPinfo *) allocator.Malloc(sizeof (ZIPinfo)); |
|
1600 BAIL_IF_MACRO(!info, PHYSFS_ERR_OUT_OF_MEMORY, NULL); |
|
1601 memset(info, '\0', sizeof (ZIPinfo)); |
|
1602 info->root.resolved = ZIP_DIRECTORY; |
|
1603 info->io = io; |
|
1604 |
|
1605 if (!zip_parse_end_of_central_dir(info, &dstart, &cdir_ofs, &entry_count)) |
|
1606 goto ZIP_openarchive_failed; |
|
1607 else if (!zip_alloc_hashtable(info, entry_count)) |
|
1608 goto ZIP_openarchive_failed; |
|
1609 else if (!zip_load_entries(info, dstart, cdir_ofs, entry_count)) |
|
1610 goto ZIP_openarchive_failed; |
|
1611 |
|
1612 assert(info->root.sibling == NULL); |
|
1613 return info; |
|
1614 |
|
1615 ZIP_openarchive_failed: |
|
1616 info->io = NULL; /* don't let ZIP_closeArchive destroy (io). */ |
|
1617 ZIP_closeArchive(info); |
|
1618 return NULL; |
|
1619 } /* ZIP_openArchive */ |
|
1620 |
|
1621 |
|
1622 static void ZIP_enumerateFiles(void *opaque, const char *dname, |
|
1623 PHYSFS_EnumFilesCallback cb, |
|
1624 const char *origdir, void *callbackdata) |
|
1625 { |
|
1626 ZIPinfo *info = ((ZIPinfo *) opaque); |
|
1627 const ZIPentry *entry = zip_find_entry(info, dname); |
|
1628 if (entry && (entry->resolved == ZIP_DIRECTORY)) |
|
1629 { |
|
1630 for (entry = entry->children; entry; entry = entry->sibling) |
|
1631 { |
|
1632 const char *ptr = strrchr(entry->name, '/'); |
|
1633 cb(callbackdata, origdir, ptr ? ptr + 1 : entry->name); |
|
1634 } /* for */ |
|
1635 } /* if */ |
|
1636 } /* ZIP_enumerateFiles */ |
|
1637 |
|
1638 |
|
1639 static PHYSFS_Io *zip_get_io(PHYSFS_Io *io, ZIPinfo *inf, ZIPentry *entry) |
|
1640 { |
|
1641 int success; |
|
1642 PHYSFS_Io *retval = io->duplicate(io); |
|
1643 BAIL_IF_MACRO(!retval, ERRPASS, NULL); |
|
1644 |
|
1645 /* !!! FIXME: if you open a dir here, it should bail ERR_NOT_A_FILE */ |
|
1646 |
|
1647 /* (inf) can be NULL if we already resolved. */ |
|
1648 success = (inf == NULL) || zip_resolve(retval, inf, entry); |
|
1649 if (success) |
|
1650 { |
|
1651 PHYSFS_sint64 offset; |
|
1652 offset = ((entry->symlink) ? entry->symlink->offset : entry->offset); |
|
1653 success = retval->seek(retval, offset); |
|
1654 } /* if */ |
|
1655 |
|
1656 if (!success) |
|
1657 { |
|
1658 retval->destroy(retval); |
|
1659 retval = NULL; |
|
1660 } /* if */ |
|
1661 |
|
1662 return retval; |
|
1663 } /* zip_get_io */ |
|
1664 |
|
1665 |
|
1666 static PHYSFS_Io *ZIP_openRead(void *opaque, const char *filename) |
|
1667 { |
|
1668 PHYSFS_Io *retval = NULL; |
|
1669 ZIPinfo *info = (ZIPinfo *) opaque; |
|
1670 ZIPentry *entry = zip_find_entry(info, filename); |
|
1671 ZIPfileinfo *finfo = NULL; |
|
1672 PHYSFS_Io *io = NULL; |
|
1673 PHYSFS_uint8 *password = NULL; |
|
1674 int i; |
|
1675 |
|
1676 /* if not found, see if maybe "$PASSWORD" is appended. */ |
|
1677 if ((!entry) && (info->has_crypto)) |
|
1678 { |
|
1679 const char *ptr = strrchr(filename, '$'); |
|
1680 if (ptr != NULL) |
|
1681 { |
|
1682 const PHYSFS_uint64 len = (PHYSFS_uint64) (ptr - filename); |
|
1683 char *str = (char *) __PHYSFS_smallAlloc(len + 1); |
|
1684 BAIL_IF_MACRO(!str, PHYSFS_ERR_OUT_OF_MEMORY, NULL); |
|
1685 memcpy(str, filename, len); |
|
1686 str[len] = '\0'; |
|
1687 entry = zip_find_entry(info, str); |
|
1688 __PHYSFS_smallFree(str); |
|
1689 password = (PHYSFS_uint8 *) (ptr + 1); |
|
1690 } /* if */ |
|
1691 } /* if */ |
|
1692 |
|
1693 BAIL_IF_MACRO(!entry, ERRPASS, NULL); |
|
1694 |
|
1695 retval = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io)); |
|
1696 GOTO_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, ZIP_openRead_failed); |
|
1697 |
|
1698 finfo = (ZIPfileinfo *) allocator.Malloc(sizeof (ZIPfileinfo)); |
|
1699 GOTO_IF_MACRO(!finfo, PHYSFS_ERR_OUT_OF_MEMORY, ZIP_openRead_failed); |
|
1700 memset(finfo, '\0', sizeof (ZIPfileinfo)); |
|
1701 |
|
1702 io = zip_get_io(info->io, info, entry); |
|
1703 GOTO_IF_MACRO(!io, ERRPASS, ZIP_openRead_failed); |
|
1704 finfo->io = io; |
|
1705 finfo->entry = ((entry->symlink != NULL) ? entry->symlink : entry); |
|
1706 initializeZStream(&finfo->stream); |
|
1707 |
|
1708 if (finfo->entry->compression_method != COMPMETH_NONE) |
|
1709 { |
|
1710 finfo->buffer = (PHYSFS_uint8 *) allocator.Malloc(ZIP_READBUFSIZE); |
|
1711 if (!finfo->buffer) |
|
1712 GOTO_MACRO(PHYSFS_ERR_OUT_OF_MEMORY, ZIP_openRead_failed); |
|
1713 else if (zlib_err(inflateInit2(&finfo->stream, -MAX_WBITS)) != Z_OK) |
|
1714 goto ZIP_openRead_failed; |
|
1715 } /* if */ |
|
1716 |
|
1717 if (!zip_entry_is_tradional_crypto(entry)) |
|
1718 GOTO_IF_MACRO(password != NULL, PHYSFS_ERR_BAD_PASSWORD, ZIP_openRead_failed); |
|
1719 else |
|
1720 { |
|
1721 PHYSFS_uint8 crypto_header[12]; |
|
1722 GOTO_IF_MACRO(password == NULL, PHYSFS_ERR_BAD_PASSWORD, ZIP_openRead_failed); |
|
1723 if (io->read(io, crypto_header, 12) != 12) |
|
1724 goto ZIP_openRead_failed; |
|
1725 else if (!zip_prep_crypto_keys(finfo, crypto_header, password)) |
|
1726 goto ZIP_openRead_failed; |
|
1727 } /* if */ |
|
1728 |
|
1729 memcpy(retval, &ZIP_Io, sizeof (PHYSFS_Io)); |
|
1730 retval->opaque = finfo; |
|
1731 |
|
1732 return retval; |
|
1733 |
|
1734 ZIP_openRead_failed: |
|
1735 if (finfo != NULL) |
|
1736 { |
|
1737 if (finfo->io != NULL) |
|
1738 finfo->io->destroy(finfo->io); |
|
1739 |
|
1740 if (finfo->buffer != NULL) |
|
1741 { |
|
1742 allocator.Free(finfo->buffer); |
|
1743 inflateEnd(&finfo->stream); |
|
1744 } /* if */ |
|
1745 |
|
1746 allocator.Free(finfo); |
|
1747 } /* if */ |
|
1748 |
|
1749 if (retval != NULL) |
|
1750 allocator.Free(retval); |
|
1751 |
|
1752 return NULL; |
|
1753 } /* ZIP_openRead */ |
|
1754 |
|
1755 |
|
1756 static PHYSFS_Io *ZIP_openWrite(void *opaque, const char *filename) |
|
1757 { |
|
1758 BAIL_MACRO(PHYSFS_ERR_READ_ONLY, NULL); |
|
1759 } /* ZIP_openWrite */ |
|
1760 |
|
1761 |
|
1762 static PHYSFS_Io *ZIP_openAppend(void *opaque, const char *filename) |
|
1763 { |
|
1764 BAIL_MACRO(PHYSFS_ERR_READ_ONLY, NULL); |
|
1765 } /* ZIP_openAppend */ |
|
1766 |
|
1767 |
|
1768 static void ZIP_closeArchive(void *opaque) |
|
1769 { |
|
1770 ZIPinfo *info = (ZIPinfo *) (opaque); |
|
1771 |
|
1772 if (!info) |
|
1773 return; |
|
1774 |
|
1775 if (info->io) |
|
1776 info->io->destroy(info->io); |
|
1777 |
|
1778 assert(info->root.sibling == NULL); |
|
1779 assert(info->hash || (info->root.children == NULL)); |
|
1780 |
|
1781 if (info->hash) |
|
1782 { |
|
1783 size_t i; |
|
1784 for (i = 0; i < info->hashBuckets; i++) |
|
1785 { |
|
1786 ZIPentry *entry; |
|
1787 ZIPentry *next; |
|
1788 for (entry = info->hash[i]; entry; entry = next) |
|
1789 { |
|
1790 next = entry->hashnext; |
|
1791 allocator.Free(entry); |
|
1792 } /* for */ |
|
1793 } /* for */ |
|
1794 allocator.Free(info->hash); |
|
1795 } /* if */ |
|
1796 |
|
1797 allocator.Free(info); |
|
1798 } /* ZIP_closeArchive */ |
|
1799 |
|
1800 |
|
1801 static int ZIP_remove(void *opaque, const char *name) |
|
1802 { |
|
1803 BAIL_MACRO(PHYSFS_ERR_READ_ONLY, 0); |
|
1804 } /* ZIP_remove */ |
|
1805 |
|
1806 |
|
1807 static int ZIP_mkdir(void *opaque, const char *name) |
|
1808 { |
|
1809 BAIL_MACRO(PHYSFS_ERR_READ_ONLY, 0); |
|
1810 } /* ZIP_mkdir */ |
|
1811 |
|
1812 |
|
1813 static int ZIP_stat(void *opaque, const char *filename, PHYSFS_Stat *stat) |
|
1814 { |
|
1815 ZIPinfo *info = (ZIPinfo *) opaque; |
|
1816 const ZIPentry *entry = zip_find_entry(info, filename); |
|
1817 |
|
1818 /* !!! FIXME: does this need to resolve entries here? */ |
|
1819 |
|
1820 if (entry == NULL) |
|
1821 return 0; |
|
1822 |
|
1823 else if (entry->resolved == ZIP_DIRECTORY) |
|
1824 { |
|
1825 stat->filesize = 0; |
|
1826 stat->filetype = PHYSFS_FILETYPE_DIRECTORY; |
|
1827 } /* if */ |
|
1828 |
|
1829 else if (zip_entry_is_symlink(entry)) |
|
1830 { |
|
1831 stat->filesize = 0; |
|
1832 stat->filetype = PHYSFS_FILETYPE_SYMLINK; |
|
1833 } /* else if */ |
|
1834 |
|
1835 else |
|
1836 { |
|
1837 stat->filesize = (PHYSFS_sint64) entry->uncompressed_size; |
|
1838 stat->filetype = PHYSFS_FILETYPE_REGULAR; |
|
1839 } /* else */ |
|
1840 |
|
1841 stat->modtime = ((entry) ? entry->last_mod_time : 0); |
|
1842 stat->createtime = stat->modtime; |
|
1843 stat->accesstime = 0; |
|
1844 stat->readonly = 1; /* .zip files are always read only */ |
|
1845 |
|
1846 return 1; |
|
1847 } /* ZIP_stat */ |
|
1848 |
|
1849 |
|
1850 const PHYSFS_Archiver __PHYSFS_Archiver_ZIP = |
|
1851 { |
|
1852 CURRENT_PHYSFS_ARCHIVER_API_VERSION, |
|
1853 { |
|
1854 "ZIP", |
|
1855 "PkZip/WinZip/Info-Zip compatible", |
|
1856 "Ryan C. Gordon <icculus@icculus.org>", |
|
1857 "https://icculus.org/physfs/", |
|
1858 1, /* supportsSymlinks */ |
|
1859 }, |
|
1860 ZIP_openArchive, |
|
1861 ZIP_enumerateFiles, |
|
1862 ZIP_openRead, |
|
1863 ZIP_openWrite, |
|
1864 ZIP_openAppend, |
|
1865 ZIP_remove, |
|
1866 ZIP_mkdir, |
|
1867 ZIP_stat, |
|
1868 ZIP_closeArchive |
|
1869 }; |
|
1870 |
|
1871 #endif /* defined PHYSFS_SUPPORTS_ZIP */ |
|
1872 |
|
1873 /* end of archiver_zip.c ... */ |
|
1874 |
|