1 files changed, 83 insertions, 0 deletions
diff --git a/dep/CascLib/src/CascDecompress.cpp b/dep/CascLib/src/CascDecompress.cpp
new file mode 100644
index 00000000000..2858bcec5ab
--- /dev/null
+++ b/dep/CascLib/src/CascDecompress.cpp
@@ -0,0 +1,83 @@
+/*****************************************************************************/
+/* CascDecompress.cpp                     Copyright (c) Ladislav Zezula 2014 */
+/*---------------------------------------------------------------------------*/
+/* Decompression functions                                                   */
+/*---------------------------------------------------------------------------*/
+/*   Date    Ver   Who  Comment                                              */
+/* --------  ----  ---  -------                                              */
+/* 02.05.14  1.00  Lad  The first version of CascDecompress.cpp              */
+/*****************************************************************************/
+
+#define __CASCLIB_SELF__
+#include "CascLib.h"
+#include "CascCommon.h"
+
+//-----------------------------------------------------------------------------
+// Local functions
+
+static int Decompress_ZLIB(LPBYTE pbOutBuffer, PDWORD pcbOutBuffer, LPBYTE pbInBuffer, DWORD cbInBuffer)
+{
+    z_stream z;                        // Stream information for zlib
+    int nResult;
+
+    // Fill the stream structure for zlib
+    z.next_in   = pbInBuffer;
+    z.avail_in  = cbInBuffer;
+    z.total_in  = cbInBuffer;
+    z.next_out  = pbOutBuffer;
+    z.avail_out = *pcbOutBuffer;
+    z.total_out = 0;
+    z.zalloc    = NULL;
+    z.zfree     = NULL;
+
+    // Initialize the decompression structure
+    if((nResult = inflateInit(&z)) == Z_OK)
+    {
+        // Call zlib to decompress the data
+        nResult = inflate(&z, Z_NO_FLUSH);
+        inflateEnd(&z);
+
+        // Give the size of the uncompressed data
+        *pcbOutBuffer = z.total_out;
+    }
+    
+    // Return an error code
+    return (nResult == Z_OK || nResult == Z_STREAM_END) ? ERROR_SUCCESS : ERROR_FILE_CORRUPT;
+}
+
+//-----------------------------------------------------------------------------
+// Public functions
+
+int CascDecompress(void * pvOutBuffer, PDWORD pcbOutBuffer, void * pvInBuffer, DWORD cbInBuffer)
+{
+    LPBYTE pbOutBuffer = (LPBYTE)pvOutBuffer;
+    LPBYTE pbInBuffer = (LPBYTE)pvInBuffer;
+    DWORD cbOutBuffer = *pcbOutBuffer;   // Current size of the output buffer
+    BYTE uCompression;                  // Decompressions applied to the data
+
+    // Verify buffer sizes
+    if(cbInBuffer <= 1)
+        return 0;
+
+    // Get applied compression types and decrement data length
+    uCompression = *pbInBuffer++;
+    cbInBuffer--;
+
+    // Perform the decompressions
+    switch(uCompression)
+    {
+        case 'N':   // Uncompressed
+
+            assert(cbOutBuffer == cbInBuffer);
+            memcpy(pbOutBuffer, pbInBuffer, cbInBuffer);
+            *pcbOutBuffer = cbOutBuffer;
+            return ERROR_SUCCESS;
+
+        case 'Z':   // ZLIB
+            
+            return Decompress_ZLIB(pbOutBuffer, pcbOutBuffer, pbInBuffer, cbInBuffer);
+    }
+
+    assert(false);
+    return ERROR_NOT_SUPPORTED;
+}