# HG changeset patch
# User Matti Hamalainen <ccr@tnsp.org>
# Date 1425095011 -7200
# Node ID 5bcd219ddde360975248e516a47da60893eca6ec
# Parent  929e43afbdb1acc6468151c6c842e713d1c7dc0e
Some work towards dmzlib decompression support for resources.
Not working yet.

diff -r 929e43afbdb1 -r 5bcd219ddde3 src/dmres.c
--- a/src/dmres.c	Sat Feb 28 05:06:55 2015 +0200
+++ b/src/dmres.c	Sat Feb 28 05:43:31 2015 +0200
@@ -8,7 +8,11 @@
 #include <time.h>
 
 #ifdef DM_USE_PACKFS
-#    include <zlib.h>
+#    ifdef DM_USE_ZLIB
+#        include <zlib.h>
+#    else
+#        include "dmzlib.h"
+#    endif
 #endif
 
 #ifdef DM_USE_STDIO
@@ -327,32 +331,14 @@
  * PACK file routines
  */
 #ifdef DM_USE_PACKFS
-static int dm_pack_preload(DMResource *handle)
+
+#ifdef DM_USE_ZLIB
+
+static int dm_pack_decompress(DMResource *handle, DMPackEntry *node)
 {
-    DMPackEntry *node;
     int res = DMERR_OK, cres, cdataLeft;
     z_stream cstream;
-    Uint8 *  cbuffer = NULL;
-
-    if (handle->lib == NULL || handle->lib->packFile == NULL)
-        return DMERR_NULLPTR;
-
-    // Search PACK nodelist for file
-    if ((node = dmPackFind(handle->lib->packFile->entries, handle->filename)) == NULL)
-    {
-        res = dmError(DMERR_NOT_FOUND,
-            "Entry '%s' not found in PACK file.\n",
-            handle->filename);
-        goto error;
-    }
-
-    // Seek to entry
-    if (fseek(handle->lib->packFile->file, node->offset, SEEK_SET) == -1)
-    {
-        res = dmError(DMERR_FSEEK,
-            "Could not seek node position in PACK file.\n");
-        goto error;
-    }
+    Uint8 * cbuffer = NULL;
 
     // Allocate a structures and buffers
     cbuffer = (Uint8 *) dmMalloc(DPACK_TMPSIZE);
@@ -379,7 +365,7 @@
     cstream.next_out = handle->rawData;
     cstream.avail_out = handle->rawSize;
     cdataLeft = node->length;
-    cres = inflateInit(&(cstream));
+    cres = inflateInit(&cstream);
     if (cres != Z_OK)
     {
         res = dmError(DMERR_INIT_FAIL,
@@ -402,13 +388,100 @@
     }
 
     // Cleanup
-    inflateEnd(&(cstream));
+    inflateEnd(&cstream);
 
 error:
     dmFree(cbuffer);
     return res;
 }
 
+#else
+
+static int dm_pack_decompress(DMResource *handle, DMPackEntry *node)
+{
+    DMZLibContext ctx;
+    Uint8 *inBuf = NULL;
+    int ret;
+
+    if ((inBuf = dmMalloc(node->length)) == NULL)
+    {
+        ret = DMERR_MALLOC;
+        goto err;
+    }
+
+    if (fread(inBuf, sizeof(Uint8), node->length, handle->lib->packFile->file) != node->length)
+    {
+        ret = DMERR_FREAD;
+        goto err;
+    }
+
+    if ((ctx.zout = ctx.zoutStart = dmMalloc(node->size)) == NULL)
+    {
+        ret = dmError(DMERR_MALLOC,
+            "Failed to allocate initial decompression buffer.\n");
+        goto err;
+    }
+
+    ctx.zbuffer    = inBuf;
+    ctx.zbufferEnd = inBuf + node->length;
+    ctx.zoutEnd    = ctx.zoutStart + node->size;
+    ctx.expandable = TRUE;
+
+    if ((ret = dmZLibParseHeader(&ctx, TRUE)) != DMERR_OK)
+        goto err;
+
+    if ((ret = dmZLibDecode(&ctx)) != DMERR_OK)
+        goto err;
+
+    handle->rawOffset = 0;
+    handle->rawData = ctx.zoutStart;
+    handle->rawSize = ctx.zout - ctx.zoutStart;
+    if (handle->rawSize != node->size)
+    {
+        ret = dmError(DMERR_COMPRESSION,
+            "Decompressed data size for '%s' does not match size stored in PACK entry (%d <> %d).\n",
+            node->filename, handle->rawSize, node->size);
+    }
+
+err:
+    dmFree(inBuf);
+    return ret;
+}
+
+#endif
+
+
+static int dm_pack_preload(DMResource *handle)
+{
+    DMPackEntry *node;
+    int res = DMERR_OK;
+
+    if (handle->lib == NULL || handle->lib->packFile == NULL)
+        return DMERR_NULLPTR;
+
+    // Search PACK nodelist for file
+    if ((node = dmPackFind(handle->lib->packFile->entries, handle->filename)) == NULL)
+    {
+        res = dmError(DMERR_NOT_FOUND,
+            "Entry '%s' not found in PACK file.\n",
+            handle->filename);
+        goto error;
+    }
+
+    // Seek to entry
+    if (fseek(handle->lib->packFile->file, node->offset, SEEK_SET) == -1)
+    {
+        res = dmError(DMERR_FSEEK,
+            "Could not seek node position in PACK file.\n");
+        goto error;
+    }
+
+    res = dm_pack_decompress(handle, node);
+
+error:
+    return res;
+}
+
 
 static int dm_pack_fopen(DMResource * f)
 {