src/archiver_slb.c
changeset 1315 c686e4f84ab5
child 1320 c1da17c10a41
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/archiver_slb.c	Mon Nov 12 23:40:29 2012 +0200
@@ -0,0 +1,121 @@
+/*
+ * SLB support routines for PhysicsFS.
+ *
+ * This driver handles SLB archives ("slab files"). This uncompressed format
+ * is used in I-War / Independence War and Independence War: Defiance.
+ *
+ * The format begins with four zero bytes (version?), the file count and the
+ * location of the table of contents. Each ToC entry contains a 64-byte buffer
+ * containing a zero-terminated filename, the offset of the data, and its size.
+ * All the filenames begin with the separator character '\'. 
+ *
+ * Please see the file LICENSE.txt in the source's root directory.
+ *
+ * This file written by Aleksi Nurmi, based on the GRP archiver by
+ * Ryan C. Gordon.
+ */
+
+#define __PHYSICSFS_INTERNAL__
+#include "physfs_internal.h"
+
+#if PHYSFS_SUPPORTS_SLB
+
+static UNPKentry *slbLoadEntries(PHYSFS_Io *io, PHYSFS_uint32 fileCount)
+{
+    UNPKentry *entries = NULL;
+    UNPKentry *entry = NULL;
+
+    entries = (UNPKentry *) allocator.Malloc(sizeof (UNPKentry) * fileCount);
+    BAIL_IF_MACRO(entries == NULL, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
+
+    for (entry = entries; fileCount > 0; fileCount--, entry++)
+    {
+        char *ptr;
+
+        /* don't include the '\' in the beginning */
+        char backslash;
+        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &backslash, 1), ERRPASS, failed);
+        GOTO_IF_MACRO(backslash != '\\', ERRPASS, failed);
+
+        /* read the rest of the buffer, 63 bytes */
+        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &entry->name, 63), ERRPASS, failed);
+        entry->name[63] = '\0'; /* in case the name lacks the null terminator */
+
+        /* convert backslashes */
+        for (ptr = entry->name; *ptr; ptr++)
+        {
+            if (*ptr == '\\')
+                *ptr = '/';
+        } /* for */
+
+        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &entry->startPos, 4),
+                      ERRPASS, failed);
+        entry->startPos = PHYSFS_swapULE32(entry->startPos);
+
+        GOTO_IF_MACRO(!__PHYSFS_readAll(io, &entry->size, 4), ERRPASS, failed);
+        entry->size = PHYSFS_swapULE32(entry->size);
+    } /* for */
+    
+    return entries;
+
+failed:
+    allocator.Free(entries);
+    return NULL;
+
+} /* slbLoadEntries */
+
+
+static void *SLB_openArchive(PHYSFS_Io *io, const char *name, int forWriting)
+{
+    PHYSFS_uint32 version;
+    PHYSFS_uint32 count = 0;
+    PHYSFS_uint32 tocPos = 0;
+    UNPKentry *entries = NULL;
+
+    assert(io != NULL);  /* shouldn't ever happen. */
+
+    BAIL_IF_MACRO(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
+
+    BAIL_IF_MACRO(!__PHYSFS_readAll(io, &version, sizeof(version)),
+                  ERRPASS, NULL);
+    version = PHYSFS_swapULE32(version);
+    BAIL_IF_MACRO(version != 0, ERRPASS, NULL);
+
+    BAIL_IF_MACRO(!__PHYSFS_readAll(io, &count, sizeof(count)), ERRPASS, NULL);
+    count = PHYSFS_swapULE32(count);
+
+    /* offset of the table of contents */
+    BAIL_IF_MACRO(!__PHYSFS_readAll(io, &tocPos, sizeof(tocPos)),
+                  ERRPASS, NULL);
+    tocPos = PHYSFS_swapULE32(tocPos);
+    
+    /* seek to the table of contents */
+    BAIL_IF_MACRO(!io->seek(io, tocPos), ERRPASS, NULL);
+
+    entries = slbLoadEntries(io, count);
+    BAIL_IF_MACRO(!entries, ERRPASS, NULL);
+
+    return UNPK_openArchive(io, entries, count);
+} /* SLB_openArchive */
+
+
+const PHYSFS_Archiver __PHYSFS_Archiver_SLB =
+{
+    {
+        "SLB",
+        "I-War / Independence War Slab file",
+        "Aleksi Nurmi <aleksi.nurmi@gmail.com>",
+        "http://bitbucket.org/ahnurmi/",
+    },
+    SLB_openArchive,        /* openArchive() method    */
+    UNPK_enumerateFiles,    /* enumerateFiles() method */
+    UNPK_openRead,          /* openRead() method       */
+    UNPK_openWrite,         /* openWrite() method      */
+    UNPK_openAppend,        /* openAppend() method     */
+    UNPK_remove,            /* remove() method         */
+    UNPK_mkdir,             /* mkdir() method          */
+    UNPK_closeArchive,      /* closeArchive() method   */
+    UNPK_stat               /* stat() method           */
+};
+
+#endif  /* defined PHYSFS_SUPPORTS_SLB */