awesome!!!

third-party/physfs/src/physfs_archiver_wad.c

@@ -0,0 +1,135 @@
+/*
+ * WAD support routines for PhysicsFS.
+ *
+ * This driver handles DOOM engine archives ("wads"). 
+ * This format (but not this driver) was designed by id Software for use
+ *  with the DOOM engine.
+ * The specs of the format are from the unofficial doom specs v1.666
+ * found here: http://www.gamers.org/dhs/helpdocs/dmsp1666.html
+ * The format of the archive: (from the specs)
+ *
+ *  A WAD file has three parts:
+ *  (1) a twelve-byte header
+ *  (2) one or more "lumps"
+ *  (3) a directory or "info table" that contains the names, offsets, and
+ *      sizes of all the lumps in the WAD
+ *
+ *  The header consists of three four-byte parts:
+ *    (a) an ASCII string which must be either "IWAD" or "PWAD"
+ *    (b) a uint32 which is the number of lumps in the wad
+ *    (c) a uint32 which is the file offset to the start of
+ *    the directory
+ *
+ *  The directory has one 16-byte entry for every lump. Each entry consists
+ *  of three parts:
+ *
+ *    (a) a uint32, the file offset to the start of the lump
+ *    (b) a uint32, the size of the lump in bytes
+ *    (c) an 8-byte ASCII string, the name of the lump, padded with zeros.
+ *        For example, the "DEMO1" entry in hexadecimal would be
+ *        (44 45 4D 4F 31 00 00 00)
+ * 
+ * Note that there is no way to tell if an opened WAD archive is a
+ *  IWAD or PWAD with this archiver.
+ * I couldn't think of a way to provide that information, without being too
+ *  hacky.
+ * I don't think it's really that important though.
+ *
+ *
+ * Please see the file LICENSE.txt in the source's root directory.
+ *
+ * This file written by Travis Wells, based on the GRP archiver by
+ *  Ryan C. Gordon.
+ */
+
+#define __PHYSICSFS_INTERNAL__
+#include "physfs_internal.h"
+
+#if PHYSFS_SUPPORTS_WAD
+
+static int wadLoadEntries(PHYSFS_Io *io, const PHYSFS_uint32 count, void *arc)
+{
+    PHYSFS_uint32 i;
+    for (i = 0; i < count; i++)
+    {
+        PHYSFS_uint32 pos;
+        PHYSFS_uint32 size;
+        char name[9];
+
+        BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &pos, 4), 0);
+        BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &size, 4), 0);
+        BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 8), 0);
+
+        name[8] = '\0'; /* name might not be null-terminated in file. */
+        size = PHYSFS_swapULE32(size);
+        pos = PHYSFS_swapULE32(pos);
+        BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, -1, -1, pos, size), 0);
+    } /* for */
+
+    return 1;
+} /* wadLoadEntries */
+
+
+static void *WAD_openArchive(PHYSFS_Io *io, const char *name,
+                             int forWriting, int *claimed)
+{
+    PHYSFS_uint8 buf[4];
+    PHYSFS_uint32 count;
+    PHYSFS_uint32 directoryOffset;
+    void *unpkarc;
+
+    assert(io != NULL);  /* shouldn't ever happen. */
+
+    BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
+    BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, sizeof (buf)), NULL);
+    if ((memcmp(buf, "IWAD", 4) != 0) && (memcmp(buf, "PWAD", 4) != 0))
+        BAIL(PHYSFS_ERR_UNSUPPORTED, NULL);
+
+    *claimed = 1;
+
+    BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &count, sizeof (count)), NULL);
+    count = PHYSFS_swapULE32(count);
+
+    BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &directoryOffset, 4), 0);
+    directoryOffset = PHYSFS_swapULE32(directoryOffset);
+
+    BAIL_IF_ERRPASS(!io->seek(io, directoryOffset), 0);
+
+    unpkarc = UNPK_openArchive(io, 0, 1);
+    BAIL_IF_ERRPASS(!unpkarc, NULL);
+
+    if (!wadLoadEntries(io, count, unpkarc))
+    {
+        UNPK_abandonArchive(unpkarc);
+        return NULL;
+    } /* if */
+
+    return unpkarc;
+} /* WAD_openArchive */
+
+
+const PHYSFS_Archiver __PHYSFS_Archiver_WAD =
+{
+    CURRENT_PHYSFS_ARCHIVER_API_VERSION,
+    {
+        "WAD",
+        "DOOM engine format",
+        "Travis Wells <traviswells@mchsi.com>",
+        "http://www.3dmm2.com/doom/",
+        0,  /* supportsSymlinks */
+    },
+    WAD_openArchive,
+    UNPK_enumerate,
+    UNPK_openRead,
+    UNPK_openWrite,
+    UNPK_openAppend,
+    UNPK_remove,
+    UNPK_mkdir,
+    UNPK_stat,
+    UNPK_closeArchive
+};
+
+#endif  /* defined PHYSFS_SUPPORTS_WAD */
+
+/* end of physfs_archiver_wad.c ... */
+