1 files changed, 114 insertions, 0 deletions
diff --git a/Source/external/physfs/physfs_archiver_hog.c b/Source/external/physfs/physfs_archiver_hog.c
new file mode 100644
index 0000000..832209f
--- /dev/null
+++ b/Source/external/physfs/physfs_archiver_hog.c
@@ -0,0 +1,114 @@
+/*
+ * HOG support routines for PhysicsFS.
+ *
+ * This driver handles Descent I/II HOG archives.
+ *
+ * The format is very simple:
+ *
+ *   The file always starts with the 3-byte signature "DHF" (Descent
+ *   HOG file). After that the files of a HOG are just attached after
+ *   another, divided by a 17 bytes header, which specifies the name
+ *   and length (in bytes) of the forthcoming file! So you just read
+ *   the header with its information of how big the following file is,
+ *   and then skip exact that number of bytes to get to the next file
+ *   in that HOG.
+ *
+ *    char sig[3] = {'D', 'H', 'F'}; // "DHF"=Descent HOG File
+ *
+ *    struct {
+ *     char file_name[13]; // Filename, padded to 13 bytes with 0s
+ *     int file_size; // filesize in bytes
+ *     char data[file_size]; // The file data
+ *    } FILE_STRUCT; // Repeated until the end of the file.
+ *
+ * (That info is from http://www.descent2.com/ddn/specs/hog/)
+ *
+ * Please see the file LICENSE.txt in the source's root directory.
+ *
+ *  This file written by Bradley Bell.
+ *  Based on grp.c by Ryan C. Gordon.
+ */
+
+#define __PHYSICSFS_INTERNAL__
+#include "physfs_internal.h"
+
+#if PHYSFS_SUPPORTS_HOG
+
+static int hogLoadEntries(PHYSFS_Io *io, void *arc)
+{
+    const PHYSFS_uint64 iolen = io->length(io);
+    PHYSFS_uint32 pos = 3;
+
+    while (pos < iolen)
+    {
+        PHYSFS_uint32 size;
+        char name[13];
+
+        BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 13), 0);
+        BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &size, 4), 0);
+        name[12] = '\0';  /* just in case. */
+        pos += 13 + 4;
+
+        size = PHYSFS_swapULE32(size);
+        BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, -1, -1, pos, size), 0);
+        pos += size;
+
+        /* skip over entry */
+        BAIL_IF_ERRPASS(!io->seek(io, pos), 0);
+    } /* while */
+
+    return 1;
+} /* hogLoadEntries */
+
+
+static void *HOG_openArchive(PHYSFS_Io *io, const char *name,
+                             int forWriting, int *claimed)
+{
+    PHYSFS_uint8 buf[3];
+    void *unpkarc = NULL;
+
+    assert(io != NULL);  /* shouldn't ever happen. */
+    BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
+    BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, 3), NULL);
+    BAIL_IF(memcmp(buf, "DHF", 3) != 0, PHYSFS_ERR_UNSUPPORTED, NULL);
+
+    *claimed = 1;
+
+    unpkarc = UNPK_openArchive(io);
+    BAIL_IF_ERRPASS(!unpkarc, NULL);
+
+    if (!hogLoadEntries(io, unpkarc))
+    {
+        UNPK_abandonArchive(unpkarc);
+        return NULL;
+    } /* if */
+
+    return unpkarc;
+} /* HOG_openArchive */
+
+
+const PHYSFS_Archiver __PHYSFS_Archiver_HOG =
+{
+    CURRENT_PHYSFS_ARCHIVER_API_VERSION,
+    {
+        "HOG",
+        "Descent I/II HOG file format",
+        "Bradley Bell <btb@icculus.org>",
+        "https://icculus.org/physfs/",
+        0,  /* supportsSymlinks */
+    },
+    HOG_openArchive,
+    UNPK_enumerate,
+    UNPK_openRead,
+    UNPK_openWrite,
+    UNPK_openAppend,
+    UNPK_remove,
+    UNPK_mkdir,
+    UNPK_stat,
+    UNPK_closeArchive
+};
+
+#endif  /* defined PHYSFS_SUPPORTS_HOG */
+
+/* end of physfs_archiver_hog.c ... */
+