misc/libphysfs/archiver_slb.c
author Wuzzy <almikes@aol.com>
Sun, 08 Oct 2017 23:34:14 +0200
changeset 12678 fb240fa9f178
parent 12213 bb5522e88ab2
permissions -rw-r--r--
Remove spaces from grave names
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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/*
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 * SLB support routines for PhysicsFS.
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 *
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 * This driver handles SLB archives ("slab files"). This uncompressed format
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 * is used in I-War / Independence War and Independence War: Defiance.
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 *
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 * The format begins with four zero bytes (version?), the file count and the
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 * location of the table of contents. Each ToC entry contains a 64-byte buffer
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 * containing a zero-terminated filename, the offset of the data, and its size.
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 * All the filenames begin with the separator character '\'. 
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 *
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 * Please see the file LICENSE.txt in the source's root directory.
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 *
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 * This file written by Aleksi Nurmi, based on the GRP archiver by
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 * Ryan C. Gordon.
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 */
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_internal.h"
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#if PHYSFS_SUPPORTS_SLB
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static UNPKentry *slbLoadEntries(PHYSFS_Io *io, PHYSFS_uint32 fileCount)
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{
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    UNPKentry *entries = NULL;
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    UNPKentry *entry = NULL;
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    entries = (UNPKentry *) allocator.Malloc(sizeof (UNPKentry) * fileCount);
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    BAIL_IF_MACRO(entries == NULL, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
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    for (entry = entries; fileCount > 0; fileCount--, entry++)
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    {
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        char *ptr;
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        /* don't include the '\' in the beginning */
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        char backslash;
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        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &backslash, 1), ERRPASS, failed);
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        GOTO_IF_MACRO(backslash != '\\', ERRPASS, failed);
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        /* read the rest of the buffer, 63 bytes */
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        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &entry->name, 63), ERRPASS, failed);
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        entry->name[63] = '\0'; /* in case the name lacks the null terminator */
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        /* convert backslashes */
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        for (ptr = entry->name; *ptr; ptr++)
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        {
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            if (*ptr == '\\')
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                *ptr = '/';
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        } /* for */
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        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &entry->startPos, 4),
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                      ERRPASS, failed);
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        entry->startPos = PHYSFS_swapULE32(entry->startPos);
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        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &entry->size, 4), ERRPASS, failed);
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        entry->size = PHYSFS_swapULE32(entry->size);
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    } /* for */
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    return entries;
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failed:
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    allocator.Free(entries);
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    return NULL;
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} /* slbLoadEntries */
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static void *SLB_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
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{
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    PHYSFS_uint32 version;
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    PHYSFS_uint32 count = 0;
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    PHYSFS_uint32 tocPos = 0;
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    UNPKentry *entries = NULL;
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    75
    assert(io != NULL);  /* shouldn't ever happen. */
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    76
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    77
    BAIL_IF_MACRO(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
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    78
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diff changeset
    79
    BAIL_IF_MACRO(!__PHYSFS_readAll(io, &version, sizeof(version)),
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    80
                  ERRPASS, NULL);
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    81
    version = PHYSFS_swapULE32(version);
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    82
    BAIL_IF_MACRO(version != 0, ERRPASS, NULL);
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    83
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diff changeset
    84
    BAIL_IF_MACRO(!__PHYSFS_readAll(io, &count, sizeof(count)), ERRPASS, NULL);
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    85
    count = PHYSFS_swapULE32(count);
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    86
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    87
    /* offset of the table of contents */
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diff changeset
    88
    BAIL_IF_MACRO(!__PHYSFS_readAll(io, &tocPos, sizeof(tocPos)),
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    89
                  ERRPASS, NULL);
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diff changeset
    90
    tocPos = PHYSFS_swapULE32(tocPos);
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    91
    
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    92
    /* seek to the table of contents */
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    93
    BAIL_IF_MACRO(!io->seek(io, tocPos), ERRPASS, NULL);
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    94
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nemo
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diff changeset
    95
    entries = slbLoadEntries(io, count);
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    96
    BAIL_IF_MACRO(!entries, ERRPASS, NULL);
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parents:
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    97
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diff changeset
    98
    return UNPK_openArchive(io, entries, count);
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    99
} /* SLB_openArchive */
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   100
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   101
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   102
const PHYSFS_Archiver __PHYSFS_Archiver_SLB =
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   103
{
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   104
    CURRENT_PHYSFS_ARCHIVER_API_VERSION,
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   105
    {
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   106
        "SLB",
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parents:
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   107
        "I-War / Independence War Slab file",
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parents:
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   108
        "Aleksi Nurmi <aleksi.nurmi@gmail.com>",
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   109
        "https://bitbucket.org/ahnurmi/",
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   110
        0,  /* supportsSymlinks */
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diff changeset
   111
    },
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parents:
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   112
    SLB_openArchive,
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   113
    UNPK_enumerateFiles,
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   114
    UNPK_openRead,
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   115
    UNPK_openWrite,
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   116
    UNPK_openAppend,
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   117
    UNPK_remove,
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   118
    UNPK_mkdir,
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   119
    UNPK_stat,
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   120
    UNPK_closeArchive
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   121
};
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   122
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   123
#endif  /* defined PHYSFS_SUPPORTS_SLB */
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   124
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   125
/* end of archiver_slb.c ... */
bb5522e88ab2 bulk copy of latest physfs to our misc/libphysfs since this seems to fix an off-by-1 error reliably hit in readln read of 1 byte probably introduced in the addition of the buffered read. Whether this is excessive or whether libphysfs should even be maintained by us is another matter. But at least we shouldn't crash
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parents:
diff changeset
   126