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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | pmbaty | 1 | /* |
| 2 | * GRP support routines for PhysicsFS. |
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| 3 | * |
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| 4 | * This driver handles BUILD engine archives ("groupfiles"). This format |
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| 5 | * (but not this driver) was put together by Ken Silverman. |
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| 6 | * |
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| 7 | * The format is simple enough. In Ken's words: |
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| 8 | * |
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| 9 | * What's the .GRP file format? |
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| 10 | * |
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| 11 | * The ".grp" file format is just a collection of a lot of files stored |
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| 12 | * into 1 big one. I tried to make the format as simple as possible: The |
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| 13 | * first 12 bytes contains my name, "KenSilverman". The next 4 bytes is |
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| 14 | * the number of files that were compacted into the group file. Then for |
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| 15 | * each file, there is a 16 byte structure, where the first 12 bytes are |
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| 16 | * the filename, and the last 4 bytes are the file's size. The rest of |
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| 17 | * the group file is just the raw data packed one after the other in the |
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| 18 | * same order as the list of files. |
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| 19 | * |
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| 20 | * (That info is from http://www.advsys.net/ken/build.htm ...) |
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| 21 | * |
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| 22 | * Please see the file LICENSE.txt in the source's root directory. |
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| 23 | * |
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| 24 | * This file written by Ryan C. Gordon. |
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| 25 | */ |
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| 26 | |||
| 27 | #define __PHYSICSFS_INTERNAL__ |
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| 28 | #include "physfs_internal.h" |
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| 29 | |||
| 30 | #if PHYSFS_SUPPORTS_GRP |
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| 31 | |||
| 32 | static int grpLoadEntries(PHYSFS_Io *io, const PHYSFS_uint32 count, void *arc) |
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| 33 | { |
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| 34 | PHYSFS_uint32 pos = 16 + (16 * count); /* past sig+metadata. */ |
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| 35 | PHYSFS_uint32 i; |
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| 36 | |||
| 37 | for (i = 0; i < count; i++) |
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| 38 | { |
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| 39 | char *ptr; |
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| 40 | char name[13]; |
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| 41 | PHYSFS_uint32 size; |
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| 42 | BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 12), 0); |
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| 43 | BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &size, 4), 0); |
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| 44 | |||
| 45 | name[12] = '\0'; /* name isn't null-terminated in file. */ |
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| 46 | if ((ptr = strchr(name, ' ')) != NULL) |
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| 47 | *ptr = '\0'; /* trim extra spaces. */ |
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| 48 | |||
| 49 | size = PHYSFS_swapULE32(size); |
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| 50 | BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, -1, -1, pos, size), 0); |
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| 51 | |||
| 52 | pos += size; |
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| 53 | } /* for */ |
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| 54 | |||
| 55 | return 1; |
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| 56 | } /* grpLoadEntries */ |
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| 57 | |||
| 58 | |||
| 59 | static void *GRP_openArchive(PHYSFS_Io *io, const char *name, |
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| 60 | int forWriting, int *claimed) |
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| 61 | { |
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| 62 | PHYSFS_uint8 buf[12]; |
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| 63 | PHYSFS_uint32 count = 0; |
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| 64 | void *unpkarc = NULL; |
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| 65 | |||
| 66 | assert(io != NULL); /* shouldn't ever happen. */ |
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| 67 | |||
| 68 | BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL); |
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| 69 | |||
| 70 | BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, sizeof (buf)), NULL); |
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| 71 | if (memcmp(buf, "KenSilverman", sizeof (buf)) != 0) |
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| 72 | BAIL(PHYSFS_ERR_UNSUPPORTED, NULL); |
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| 73 | |||
| 74 | *claimed = 1; |
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| 75 | |||
| 76 | BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &count, sizeof(count)), NULL); |
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| 77 | count = PHYSFS_swapULE32(count); |
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| 78 | |||
| 79 | unpkarc = UNPK_openArchive(io); |
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| 80 | BAIL_IF_ERRPASS(!unpkarc, NULL); |
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| 81 | |||
| 82 | if (!grpLoadEntries(io, count, unpkarc)) |
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| 83 | { |
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| 84 | UNPK_abandonArchive(unpkarc); |
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| 85 | return NULL; |
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| 86 | } /* if */ |
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| 87 | |||
| 88 | return unpkarc; |
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| 89 | } /* GRP_openArchive */ |
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| 90 | |||
| 91 | |||
| 92 | const PHYSFS_Archiver __PHYSFS_Archiver_GRP = |
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| 93 | { |
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| 94 | CURRENT_PHYSFS_ARCHIVER_API_VERSION, |
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| 95 | { |
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| 96 | "GRP", |
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| 97 | "Build engine Groupfile format", |
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| 98 | "Ryan C. Gordon <icculus@icculus.org>", |
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| 99 | "https://icculus.org/physfs/", |
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| 100 | 0, /* supportsSymlinks */ |
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| 101 | }, |
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| 102 | GRP_openArchive, |
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| 103 | UNPK_enumerate, |
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| 104 | UNPK_openRead, |
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| 105 | UNPK_openWrite, |
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| 106 | UNPK_openAppend, |
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| 107 | UNPK_remove, |
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| 108 | UNPK_mkdir, |
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| 109 | UNPK_stat, |
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| 110 | UNPK_closeArchive |
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| 111 | }; |
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| 112 | |||
| 113 | #endif /* defined PHYSFS_SUPPORTS_GRP */ |
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| 114 | |||
| 115 | /* end of physfs_archiver_grp.c ... */ |
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| 116 |