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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | pmbaty | 1 | /* |
| 2 | * MVL support routines for PhysicsFS. |
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| 3 | * |
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| 4 | * This driver handles Descent II Movielib archives. |
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| 5 | * |
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| 6 | * The file format of MVL is quite easy... |
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| 7 | * |
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| 8 | * //MVL File format - Written by Heiko Herrmann |
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| 9 | * char sig[4] = {'D','M', 'V', 'L'}; // "DMVL"=Descent MoVie Library |
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| 10 | * |
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| 11 | * int num_files; // the number of files in this MVL |
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| 12 | * |
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| 13 | * struct { |
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| 14 | * char file_name[13]; // Filename, padded to 13 bytes with 0s |
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| 15 | * int file_size; // filesize in bytes |
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| 16 | * }DIR_STRUCT[num_files]; |
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| 17 | * |
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| 18 | * struct { |
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| 19 | * char data[file_size]; // The file data |
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| 20 | * }FILE_STRUCT[num_files]; |
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| 21 | * |
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| 22 | * (That info is from http://www.descent2.com/ddn/specs/mvl/) |
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| 23 | * |
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| 24 | * Please see the file LICENSE.txt in the source's root directory. |
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| 25 | * |
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| 26 | * This file written by Bradley Bell. |
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| 27 | * Based on grp.c by Ryan C. Gordon. |
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| 28 | */ |
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| 29 | |||
| 30 | #define __PHYSICSFS_INTERNAL__ |
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| 31 | #include "physfs_internal.h" |
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| 32 | |||
| 33 | #if PHYSFS_SUPPORTS_MVL |
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| 34 | |||
| 35 | static int mvlLoadEntries(PHYSFS_Io *io, const PHYSFS_uint32 count, void *arc) |
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| 36 | { |
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| 37 | PHYSFS_uint32 pos = 8 + (17 * count); /* past sig+metadata. */ |
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| 38 | PHYSFS_uint32 i; |
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| 39 | |||
| 40 | for (i = 0; i < count; i++) |
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| 41 | { |
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| 42 | PHYSFS_uint32 size; |
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| 43 | char name[13]; |
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| 44 | BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 13), 0); |
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| 45 | BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &size, 4), 0); |
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| 46 | name[12] = '\0'; /* just in case. */ |
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| 47 | size = PHYSFS_swapULE32(size); |
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| 48 | BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, -1, -1, pos, size), 0); |
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| 49 | pos += size; |
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| 50 | } /* for */ |
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| 51 | |||
| 52 | return 1; |
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| 53 | } /* mvlLoadEntries */ |
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| 54 | |||
| 55 | |||
| 56 | static void *MVL_openArchive(PHYSFS_Io *io, const char *name, |
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| 57 | int forWriting, int *claimed) |
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| 58 | { |
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| 59 | PHYSFS_uint8 buf[4]; |
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| 60 | PHYSFS_uint32 count = 0; |
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| 61 | void *unpkarc; |
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| 62 | |||
| 63 | assert(io != NULL); /* shouldn't ever happen. */ |
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| 64 | BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL); |
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| 65 | BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, 4), NULL); |
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| 66 | BAIL_IF(memcmp(buf, "DMVL", 4) != 0, PHYSFS_ERR_UNSUPPORTED, NULL); |
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| 67 | |||
| 68 | *claimed = 1; |
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| 69 | |||
| 70 | BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &count, sizeof(count)), NULL); |
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| 71 | count = PHYSFS_swapULE32(count); |
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| 72 | |||
| 73 | unpkarc = UNPK_openArchive(io); |
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| 74 | BAIL_IF_ERRPASS(!unpkarc, NULL); |
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| 75 | |||
| 76 | if (!mvlLoadEntries(io, count, unpkarc)) |
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| 77 | { |
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| 78 | UNPK_abandonArchive(unpkarc); |
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| 79 | return NULL; |
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| 80 | } /* if */ |
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| 81 | |||
| 82 | return unpkarc; |
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| 83 | } /* MVL_openArchive */ |
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| 84 | |||
| 85 | |||
| 86 | const PHYSFS_Archiver __PHYSFS_Archiver_MVL = |
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| 87 | { |
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| 88 | CURRENT_PHYSFS_ARCHIVER_API_VERSION, |
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| 89 | { |
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| 90 | "MVL", |
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| 91 | "Descent II Movielib format", |
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| 92 | "Bradley Bell <btb@icculus.org>", |
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| 93 | "https://icculus.org/physfs/", |
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| 94 | 0, /* supportsSymlinks */ |
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| 95 | }, |
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| 96 | MVL_openArchive, |
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| 97 | UNPK_enumerate, |
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| 98 | UNPK_openRead, |
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| 99 | UNPK_openWrite, |
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| 100 | UNPK_openAppend, |
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| 101 | UNPK_remove, |
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| 102 | UNPK_mkdir, |
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| 103 | UNPK_stat, |
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| 104 | UNPK_closeArchive |
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| 105 | }; |
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| 106 | |||
| 107 | #endif /* defined PHYSFS_SUPPORTS_MVL */ |
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| 108 | |||
| 109 | /* end of physfs_archiver_mvl.c ... */ |
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| 110 |