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@@ -0,0 +1,123 @@
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+/*
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+ * CSM support routines for PhysicsFS.
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+ *
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+ * This driver handles Chasm: The Rift engine archives ("CSM.BINs").
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+ * This format (but not this driver) was developed by Action Forms Ltd.
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+ * and published by Megamedia for use with the Chasm: The Rift engine.
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+ * The specs of the format are from http://github.com/Panzerschrek/Chasm-Reverse
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+ * The format of the archive: (from the specs)
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+ *
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+ * A CSM file has three parts:
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+ * (1) a 6 byte header
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+ * (2) a TOC that contains the names, offsets, and
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+ * sizes of all the entries in the CSM.BIN
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+ *
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+ * The header consists of three four-byte parts:
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+ * (a) an ASCII string which must be "CSid"
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+ * (b) a uint16 which is the number of TOC entries in the CSM.BIN
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+ *
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+ * The TOC has one -byte entry for every lump. Each entry consists
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+ * of three parts:
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+ *
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+ * (a) a uint8, the length of the filename
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+ * (b) an 12-byte ASCII string, the name of the entry, padded with zeros.
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+ * (c) a uint32, the size of the entry in bytes
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+ * (d) a uint32, the file offset to the start of the entry
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+ *
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+ *
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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 Jon Daniel, based on the WAD archiver by
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+ * Travis Wells.
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+ */
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+
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+#define __PHYSICSFS_INTERNAL__
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+#include "physfs_internal.h"
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+
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+#if PHYSFS_SUPPORTS_CSM
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+
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+static int csmLoadEntries(PHYSFS_Io *io, const PHYSFS_uint16 count, void *arc)
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+{
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+ PHYSFS_uint16 i;
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+ for (i = 0; i < count; i++)
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+ {
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+ PHYSFS_uint8 fn_len;
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+ char name[12];
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+ PHYSFS_uint32 size;
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+ PHYSFS_uint32 pos;
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+
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+ BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &fn_len, 1), 0);
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+ BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 12), 0);
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+ BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &size, 4), 0);
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+ BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &pos, 4), 0);
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+
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+ if(fn_len > 12) fn_len = 12;
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+ name[fn_len] = '\0'; /* name might not be null-terminated in file. */
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+ size = PHYSFS_swapULE32(size);
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+ pos = PHYSFS_swapULE32(pos);
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+ BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, -1, -1, pos, size), 0);
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+ } /* for */
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+
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+ return 1;
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+} /* csmLoadEntries */
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+
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+
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+static void *CSM_openArchive(PHYSFS_Io *io, const char *name,
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+ int forWriting, int *claimed)
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+{
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+ PHYSFS_uint8 buf[4];
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+ PHYSFS_uint16 count;
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+ void *unpkarc;
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+
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+ assert(io != NULL); /* shouldn't ever happen. */
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+
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+ BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
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+ BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, sizeof (buf)), NULL);
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+ if (memcmp(buf, "CSid", 4) != 0)
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+ BAIL(PHYSFS_ERR_UNSUPPORTED, NULL);
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+
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+ *claimed = 1;
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+
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+ BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &count, sizeof (count)), NULL);
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+ count = PHYSFS_swapULE16(count);
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+
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+
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+ unpkarc = UNPK_openArchive(io, 0, 1);
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+ BAIL_IF_ERRPASS(!unpkarc, NULL);
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+
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+ if (!csmLoadEntries(io, count, unpkarc))
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+ {
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+ UNPK_abandonArchive(unpkarc);
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+ return NULL;
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+ } /* if */
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+
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+ return unpkarc;
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+} /* CSM_openArchive */
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+
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+
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+const PHYSFS_Archiver __PHYSFS_Archiver_CSM =
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+{
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+ CURRENT_PHYSFS_ARCHIVER_API_VERSION,
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+ {
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+ "CSM",
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+ "Chasm: The Rift engine format",
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+ "Jon Daniel <jondaniel879@gmail.com>",
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+ "http://www.github.com/Panzerschrek/Chasm-Reverse",
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+ 0, /* supportsSymlinks */
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+ },
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+ CSM_openArchive,
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+ UNPK_enumerate,
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+ UNPK_openRead,
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+ UNPK_openWrite,
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+ UNPK_openAppend,
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+ UNPK_remove,
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+ UNPK_mkdir,
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+ UNPK_stat,
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+ UNPK_closeArchive
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+};
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+
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+#endif /* defined PHYSFS_SUPPORTS_CSM */
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+
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+/* end of physfs_archiver_CSM.c ... */
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+
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Jon Daniel