1 /***************************************************************************/ |
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2 /* */ |
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3 /* ftsystem.c */ |
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4 /* */ |
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5 /* Amiga-specific FreeType low-level system interface (body). */ |
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6 /* */ |
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7 /* Copyright 1996-2001, 2002, 2005, 2006, 2007, 2010 by */ |
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8 /* David Turner, Robert Wilhelm, Werner Lemberg and Detlef Würkner. */ |
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9 /* */ |
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10 /* This file is part of the FreeType project, and may only be used, */ |
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11 /* modified, and distributed under the terms of the FreeType project */ |
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12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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13 /* this file you indicate that you have read the license and */ |
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14 /* understand and accept it fully. */ |
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15 /* */ |
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16 /***************************************************************************/ |
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17 |
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18 /*************************************************************************/ |
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19 /* */ |
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20 /* This file contains the Amiga interface used by FreeType to access */ |
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21 /* low-level, i.e. memory management, i/o access as well as thread */ |
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22 /* synchronisation. */ |
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23 /* */ |
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24 /*************************************************************************/ |
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25 |
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26 |
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27 /*************************************************************************/ |
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28 /* */ |
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29 /* Maintained by Detlef Würkner <TetiSoft@apg.lahn.de> */ |
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30 /* */ |
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31 /* Based on the original ftsystem.c, */ |
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32 /* modified to avoid fopen(), fclose(), fread(), fseek(), ftell(), */ |
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33 /* malloc(), realloc(), and free(). */ |
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34 /* */ |
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35 /* Those C library functions are often not thread-safe or cant be */ |
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36 /* used in a shared Amiga library. If that's not a problem for you, */ |
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37 /* you can of course use the default ftsystem.c with C library calls */ |
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38 /* instead. */ |
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39 /* */ |
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40 /* This implementation needs exec V39+ because it uses AllocPooled() etc */ |
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41 /* */ |
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42 /*************************************************************************/ |
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43 |
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44 #define __NOLIBBASE__ |
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45 #define __NOGLOBALIFACE__ |
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46 #define __USE_INLINE__ |
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47 #include <proto/exec.h> |
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48 #include <dos/stdio.h> |
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49 #include <proto/dos.h> |
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50 #ifdef __amigaos4__ |
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51 extern struct ExecIFace *IExec; |
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52 extern struct DOSIFace *IDOS; |
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53 #else |
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54 extern struct Library *SysBase; |
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55 extern struct Library *DOSBase; |
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56 #endif |
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57 |
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58 #define IOBUF_SIZE 512 |
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59 |
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60 /* structure that helps us to avoid |
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61 * useless calls of Seek() and Read() |
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62 */ |
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63 struct SysFile |
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64 { |
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65 BPTR file; |
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66 ULONG iobuf_start; |
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67 ULONG iobuf_end; |
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68 UBYTE iobuf[IOBUF_SIZE]; |
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69 }; |
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70 |
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71 #ifndef __amigaos4__ |
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72 /* C implementation of AllocVecPooled (see autodoc exec/AllocPooled) */ |
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73 APTR |
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74 Alloc_VecPooled( APTR poolHeader, |
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75 ULONG memSize ) |
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76 { |
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77 ULONG newSize = memSize + sizeof ( ULONG ); |
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78 ULONG *mem = AllocPooled( poolHeader, newSize ); |
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79 |
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80 if ( !mem ) |
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81 return NULL; |
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82 *mem = newSize; |
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83 return mem + 1; |
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84 } |
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85 |
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86 /* C implementation of FreeVecPooled (see autodoc exec/AllocPooled) */ |
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87 void |
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88 Free_VecPooled( APTR poolHeader, |
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89 APTR memory ) |
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90 { |
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91 ULONG *realmem = (ULONG *)memory - 1; |
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92 |
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93 FreePooled( poolHeader, realmem, *realmem ); |
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94 } |
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95 #endif |
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96 |
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97 #include <ft2build.h> |
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98 #include FT_CONFIG_CONFIG_H |
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99 #include FT_INTERNAL_DEBUG_H |
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100 #include FT_SYSTEM_H |
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101 #include FT_ERRORS_H |
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102 #include FT_TYPES_H |
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103 |
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104 #include <stdio.h> |
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105 #include <stdlib.h> |
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106 #include <string.h> |
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107 |
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108 |
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109 /*************************************************************************/ |
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110 /* */ |
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111 /* MEMORY MANAGEMENT INTERFACE */ |
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112 /* */ |
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113 /*************************************************************************/ |
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114 |
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115 /*************************************************************************/ |
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116 /* */ |
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117 /* It is not necessary to do any error checking for the */ |
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118 /* allocation-related functions. This is done by the higher level */ |
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119 /* routines like ft_mem_alloc() or ft_mem_realloc(). */ |
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120 /* */ |
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121 /*************************************************************************/ |
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122 |
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123 |
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124 /*************************************************************************/ |
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125 /* */ |
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126 /* <Function> */ |
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127 /* ft_alloc */ |
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128 /* */ |
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129 /* <Description> */ |
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130 /* The memory allocation function. */ |
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131 /* */ |
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132 /* <Input> */ |
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133 /* memory :: A pointer to the memory object. */ |
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134 /* */ |
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135 /* size :: The requested size in bytes. */ |
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136 /* */ |
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137 /* <Return> */ |
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138 /* The address of newly allocated block. */ |
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139 /* */ |
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140 FT_CALLBACK_DEF( void* ) |
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141 ft_alloc( FT_Memory memory, |
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142 long size ) |
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143 { |
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144 #ifdef __amigaos4__ |
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145 return AllocVecPooled( memory->user, size ); |
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146 #else |
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147 return Alloc_VecPooled( memory->user, size ); |
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148 #endif |
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149 } |
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150 |
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151 |
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152 /*************************************************************************/ |
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153 /* */ |
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154 /* <Function> */ |
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155 /* ft_realloc */ |
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156 /* */ |
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157 /* <Description> */ |
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158 /* The memory reallocation function. */ |
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159 /* */ |
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160 /* <Input> */ |
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161 /* memory :: A pointer to the memory object. */ |
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162 /* */ |
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163 /* cur_size :: The current size of the allocated memory block. */ |
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164 /* */ |
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165 /* new_size :: The newly requested size in bytes. */ |
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166 /* */ |
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167 /* block :: The current address of the block in memory. */ |
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168 /* */ |
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169 /* <Return> */ |
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170 /* The address of the reallocated memory block. */ |
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171 /* */ |
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172 FT_CALLBACK_DEF( void* ) |
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173 ft_realloc( FT_Memory memory, |
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174 long cur_size, |
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175 long new_size, |
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176 void* block ) |
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177 { |
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178 void* new_block; |
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179 |
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180 #ifdef __amigaos4__ |
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181 new_block = AllocVecPooled ( memory->user, new_size ); |
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182 #else |
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183 new_block = Alloc_VecPooled ( memory->user, new_size ); |
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184 #endif |
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185 if ( new_block != NULL ) |
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186 { |
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187 CopyMem ( block, new_block, |
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188 ( new_size > cur_size ) ? cur_size : new_size ); |
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189 #ifdef __amigaos4__ |
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190 FreeVecPooled ( memory->user, block ); |
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191 #else |
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192 Free_VecPooled ( memory->user, block ); |
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193 #endif |
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194 } |
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195 return new_block; |
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196 } |
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197 |
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198 |
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199 /*************************************************************************/ |
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200 /* */ |
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201 /* <Function> */ |
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202 /* ft_free */ |
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203 /* */ |
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204 /* <Description> */ |
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205 /* The memory release function. */ |
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206 /* */ |
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207 /* <Input> */ |
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208 /* memory :: A pointer to the memory object. */ |
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209 /* */ |
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210 /* block :: The address of block in memory to be freed. */ |
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211 /* */ |
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212 FT_CALLBACK_DEF( void ) |
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213 ft_free( FT_Memory memory, |
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214 void* block ) |
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215 { |
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216 #ifdef __amigaos4__ |
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217 FreeVecPooled( memory->user, block ); |
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218 #else |
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219 Free_VecPooled( memory->user, block ); |
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220 #endif |
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221 } |
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222 |
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223 |
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224 /*************************************************************************/ |
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225 /* */ |
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226 /* RESOURCE MANAGEMENT INTERFACE */ |
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227 /* */ |
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228 /*************************************************************************/ |
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229 |
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230 |
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231 /*************************************************************************/ |
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232 /* */ |
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233 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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234 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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235 /* messages during execution. */ |
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236 /* */ |
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237 #undef FT_COMPONENT |
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238 #define FT_COMPONENT trace_io |
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239 |
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240 /* We use the macro STREAM_FILE for convenience to extract the */ |
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241 /* system-specific stream handle from a given FreeType stream object */ |
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242 #define STREAM_FILE( stream ) ( (struct SysFile *)stream->descriptor.pointer ) |
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243 |
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244 |
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245 /*************************************************************************/ |
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246 /* */ |
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247 /* <Function> */ |
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248 /* ft_amiga_stream_close */ |
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249 /* */ |
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250 /* <Description> */ |
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251 /* The function to close a stream. */ |
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252 /* */ |
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253 /* <Input> */ |
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254 /* stream :: A pointer to the stream object. */ |
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255 /* */ |
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256 FT_CALLBACK_DEF( void ) |
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257 ft_amiga_stream_close( FT_Stream stream ) |
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258 { |
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259 struct SysFile* sysfile; |
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260 |
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261 sysfile = STREAM_FILE( stream ); |
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262 Close ( sysfile->file ); |
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263 FreeMem ( sysfile, sizeof ( struct SysFile )); |
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264 |
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265 stream->descriptor.pointer = NULL; |
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266 stream->size = 0; |
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267 stream->base = 0; |
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268 } |
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269 |
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270 |
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271 /*************************************************************************/ |
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272 /* */ |
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273 /* <Function> */ |
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274 /* ft_amiga_stream_io */ |
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275 /* */ |
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276 /* <Description> */ |
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277 /* The function to open a stream. */ |
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278 /* */ |
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279 /* <Input> */ |
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280 /* stream :: A pointer to the stream object. */ |
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281 /* */ |
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282 /* offset :: The position in the data stream to start reading. */ |
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283 /* */ |
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284 /* buffer :: The address of buffer to store the read data. */ |
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285 /* */ |
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286 /* count :: The number of bytes to read from the stream. */ |
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287 /* */ |
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288 /* <Return> */ |
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289 /* The number of bytes actually read. */ |
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290 /* */ |
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291 FT_CALLBACK_DEF( unsigned long ) |
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292 ft_amiga_stream_io( FT_Stream stream, |
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293 unsigned long offset, |
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294 unsigned char* buffer, |
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295 unsigned long count ) |
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296 { |
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297 struct SysFile* sysfile; |
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298 unsigned long read_bytes; |
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299 |
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300 if ( count != 0 ) |
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301 { |
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302 sysfile = STREAM_FILE( stream ); |
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303 |
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304 /* handle the seek */ |
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305 if ( (offset < sysfile->iobuf_start) || (offset + count > sysfile->iobuf_end) ) |
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306 { |
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307 /* requested offset implies we need a buffer refill */ |
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308 if ( !sysfile->iobuf_end || offset != sysfile->iobuf_end ) |
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309 { |
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310 /* a physical seek is necessary */ |
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311 Seek( sysfile->file, offset, OFFSET_BEGINNING ); |
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312 } |
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313 sysfile->iobuf_start = offset; |
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314 sysfile->iobuf_end = 0; /* trigger a buffer refill */ |
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315 } |
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316 |
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317 /* handle the read */ |
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318 if ( offset + count <= sysfile->iobuf_end ) |
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319 { |
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320 /* we have buffer and requested bytes are all inside our buffer */ |
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321 CopyMem( &sysfile->iobuf[offset - sysfile->iobuf_start], buffer, count ); |
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322 read_bytes = count; |
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323 } |
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324 else |
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325 { |
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326 /* (re)fill buffer */ |
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327 if ( count <= IOBUF_SIZE ) |
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328 { |
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329 /* requested bytes is a subset of the buffer */ |
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330 read_bytes = Read( sysfile->file, sysfile->iobuf, IOBUF_SIZE ); |
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331 if ( read_bytes == -1UL ) |
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332 { |
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333 /* error */ |
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334 read_bytes = 0; |
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335 } |
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336 else |
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337 { |
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338 sysfile->iobuf_end = offset + read_bytes; |
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339 CopyMem( sysfile->iobuf, buffer, count ); |
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340 if ( read_bytes > count ) |
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341 { |
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342 read_bytes = count; |
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343 } |
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344 } |
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345 } |
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346 else |
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347 { |
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348 /* we actually need more than our buffer can hold, so we decide |
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349 ** to do a single big read, and then copy the last IOBUF_SIZE |
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350 ** bytes of that to our internal buffer for later use */ |
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351 read_bytes = Read( sysfile->file, buffer, count ); |
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352 if ( read_bytes == -1UL ) |
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353 { |
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354 /* error */ |
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355 read_bytes = 0; |
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356 } |
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357 else |
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358 { |
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359 ULONG bufsize; |
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360 |
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361 bufsize = ( read_bytes > IOBUF_SIZE ) ? IOBUF_SIZE : read_bytes; |
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362 sysfile->iobuf_end = offset + read_bytes; |
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363 sysfile->iobuf_start = sysfile->iobuf_end - bufsize; |
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364 CopyMem( &buffer[read_bytes - bufsize] , sysfile->iobuf, bufsize ); |
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365 } |
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366 } |
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367 } |
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368 } |
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369 else |
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370 { |
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371 read_bytes = 0; |
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372 } |
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373 |
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374 return read_bytes; |
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375 } |
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376 |
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377 |
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378 /* documentation is in ftobjs.h */ |
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379 |
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380 FT_BASE_DEF( FT_Error ) |
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381 FT_Stream_Open( FT_Stream stream, |
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382 const char* filepathname ) |
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383 { |
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384 struct FileInfoBlock* fib; |
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385 struct SysFile* sysfile; |
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386 |
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387 |
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388 if ( !stream ) |
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389 return FT_Err_Invalid_Stream_Handle; |
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390 |
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391 #ifdef __amigaos4__ |
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392 sysfile = AllocMem ( sizeof (struct SysFile ), MEMF_SHARED ); |
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393 #else |
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394 sysfile = AllocMem ( sizeof (struct SysFile ), MEMF_PUBLIC ); |
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395 #endif |
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396 if ( !sysfile ) |
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397 { |
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398 FT_ERROR(( "FT_Stream_Open:" )); |
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399 FT_ERROR(( " could not open `%s'\n", filepathname )); |
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400 |
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401 return FT_Err_Cannot_Open_Resource; |
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402 } |
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403 sysfile->file = Open( (STRPTR)filepathname, MODE_OLDFILE ); |
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404 if ( !sysfile->file ) |
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405 { |
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406 FreeMem ( sysfile, sizeof ( struct SysFile )); |
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407 FT_ERROR(( "FT_Stream_Open:" )); |
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408 FT_ERROR(( " could not open `%s'\n", filepathname )); |
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409 |
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410 return FT_Err_Cannot_Open_Resource; |
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411 } |
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412 |
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413 fib = AllocDosObject( DOS_FIB, NULL ); |
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414 if ( !fib ) |
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415 { |
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416 Close ( sysfile->file ); |
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417 FreeMem ( sysfile, sizeof ( struct SysFile )); |
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418 FT_ERROR(( "FT_Stream_Open:" )); |
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419 FT_ERROR(( " could not open `%s'\n", filepathname )); |
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420 |
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421 return FT_Err_Cannot_Open_Resource; |
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422 } |
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423 if ( !( ExamineFH( sysfile->file, fib ) ) ) |
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424 { |
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425 FreeDosObject( DOS_FIB, fib ); |
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426 Close ( sysfile->file ); |
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427 FreeMem ( sysfile, sizeof ( struct SysFile )); |
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428 FT_ERROR(( "FT_Stream_Open:" )); |
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429 FT_ERROR(( " could not open `%s'\n", filepathname )); |
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430 |
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431 return FT_Err_Cannot_Open_Resource; |
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432 } |
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433 stream->size = fib->fib_Size; |
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434 FreeDosObject( DOS_FIB, fib ); |
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435 |
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436 stream->descriptor.pointer = (void *)sysfile; |
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437 stream->pathname.pointer = (char*)filepathname; |
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438 sysfile->iobuf_start = 0; |
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439 sysfile->iobuf_end = 0; |
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440 stream->pos = 0; |
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441 |
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442 stream->read = ft_amiga_stream_io; |
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443 stream->close = ft_amiga_stream_close; |
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444 |
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445 if ( !stream->size ) |
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446 { |
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447 ft_amiga_stream_close( stream ); |
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448 FT_ERROR(( "FT_Stream_Open:" )); |
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449 FT_ERROR(( " opened `%s' but zero-sized\n", filepathname )); |
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450 return FT_Err_Cannot_Open_Stream;; |
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451 } |
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452 |
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453 FT_TRACE1(( "FT_Stream_Open:" )); |
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454 FT_TRACE1(( " opened `%s' (%ld bytes) successfully\n", |
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455 filepathname, stream->size )); |
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456 |
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457 return FT_Err_Ok; |
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458 } |
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459 |
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460 |
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461 #ifdef FT_DEBUG_MEMORY |
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462 |
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463 extern FT_Int |
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464 ft_mem_debug_init( FT_Memory memory ); |
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465 |
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466 extern void |
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467 ft_mem_debug_done( FT_Memory memory ); |
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468 |
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469 #endif |
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470 |
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471 |
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472 /* documentation is in ftobjs.h */ |
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473 |
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474 FT_BASE_DEF( FT_Memory ) |
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475 FT_New_Memory( void ) |
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476 { |
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477 FT_Memory memory; |
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478 |
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479 |
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480 #ifdef __amigaos4__ |
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481 memory = (FT_Memory)AllocVec( sizeof ( *memory ), MEMF_SHARED ); |
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482 #else |
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483 memory = (FT_Memory)AllocVec( sizeof ( *memory ), MEMF_PUBLIC ); |
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484 #endif |
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485 if ( memory ) |
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486 { |
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487 #ifdef __amigaos4__ |
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488 memory->user = CreatePool( MEMF_SHARED, 16384, 16384 ); |
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489 #else |
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490 memory->user = CreatePool( MEMF_PUBLIC, 16384, 16384 ); |
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491 #endif |
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492 if ( memory->user == NULL ) |
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493 { |
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494 FreeVec( memory ); |
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495 memory = NULL; |
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496 } |
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497 else |
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498 { |
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499 memory->alloc = ft_alloc; |
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500 memory->realloc = ft_realloc; |
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501 memory->free = ft_free; |
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502 #ifdef FT_DEBUG_MEMORY |
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503 ft_mem_debug_init( memory ); |
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504 #endif |
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505 } |
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506 } |
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507 |
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508 return memory; |
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509 } |
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510 |
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511 |
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512 /* documentation is in ftobjs.h */ |
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513 |
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514 FT_BASE_DEF( void ) |
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515 FT_Done_Memory( FT_Memory memory ) |
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516 { |
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517 #ifdef FT_DEBUG_MEMORY |
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518 ft_mem_debug_done( memory ); |
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519 #endif |
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520 |
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521 DeletePool( memory->user ); |
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522 FreeVec( memory ); |
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523 } |
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524 |
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525 /* |
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526 Local Variables: |
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527 coding: latin-1 |
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528 End: |
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529 */ |
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530 /* END */ |
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