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-rw-r--r--nxcomp/Alpha.cpp126
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diff --git a/nxcomp/Alpha.cpp b/nxcomp/Alpha.cpp
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+/**************************************************************************/
+/* */
+/* Copyright (c) 2001, 2010 NoMachine, http://www.nomachine.com/. */
+/* */
+/* NXCOMP, NX protocol compression and NX extensions to this software */
+/* are copyright of NoMachine. Redistribution and use of the present */
+/* software is allowed according to terms specified in the file LICENSE */
+/* which comes in the source distribution. */
+/* */
+/* Check http://www.nomachine.com/licensing.html for applicability. */
+/* */
+/* NX and NoMachine are trademarks of Medialogic S.p.A. */
+/* */
+/* All rights reserved. */
+/* */
+/**************************************************************************/
+
+#include "Misc.h"
+#include "Unpack.h"
+#include "Alpha.h"
+
+#define PANIC
+#define WARNING
+#undef TEST
+#undef DEBUG
+
+int UnpackAlpha(unsigned char method, unsigned char *src_data, int src_size,
+ unsigned char *dst_data, int dst_size)
+{
+ if (*src_data == 0)
+ {
+ if (dst_size != src_size - 1)
+ {
+ #ifdef TEST
+ *logofs << "UnpackAlpha: PANIC! Invalid destination size "
+ << dst_size << " with source " << src_size
+ << ".\n" << logofs_flush;
+ #endif
+
+ return -1;
+ }
+
+ #ifdef TEST
+ *logofs << "UnpackAlpha: Expanding " << src_size - 1
+ << " bytes of plain alpha data.\n" << logofs_flush;
+ #endif
+
+ memcpy(dst_data, src_data + 1, src_size - 1);
+
+ return 1;
+ }
+
+ unsigned int check_size = dst_size;
+
+ int result = ZDecompress(&unpackStream, dst_data, &check_size,
+ src_data + 1, src_size - 1);
+
+ if (result != Z_OK)
+ {
+ #ifdef PANIC
+ *logofs << "UnpackAlpha: PANIC! Failure decompressing alpha data. "
+ << "Error is '" << zError(result) << "'.\n"
+ << logofs_flush;
+ #endif
+
+ cerr << "Error" << ": Failure decompressing alpha data. "
+ << "Error is '" << zError(result) << "'.\n";
+
+ return -1;
+ }
+ else if (check_size != (unsigned int) dst_size)
+ {
+ #ifdef PANIC
+ *logofs << "UnpackAlpha: PANIC! Size mismatch in alpha data. "
+ << "Resulting size is " << check_size << " with "
+ << "expected size " << dst_size << ".\n"
+ << logofs_flush;
+ #endif
+
+ cerr << "Error" << ": Size mismatch in alpha data. "
+ << "Resulting size is " << check_size << " with "
+ << "expected size " << dst_size << ".\n";
+
+ return -1;
+ }
+
+ #ifdef TEST
+ *logofs << "UnpackAlpha: Decompressed " << src_size - 1
+ << " bytes to " << dst_size << " bytes of alpha data.\n"
+ << logofs_flush;
+ #endif
+
+ return 1;
+}
+
+int UnpackAlpha(T_alpha *alpha, unsigned char *dst_data,
+ int dst_size, int big_endian)
+{
+ unsigned int count = dst_size >> 2;
+
+ unsigned int i;
+
+ int shift;
+
+ if (count != alpha -> entries)
+ {
+ #ifdef WARNING
+ *logofs << "UnpackAlpha: WARNING! Not applying the alpha with "
+ << count << " elements needed and " << alpha -> entries
+ << " available.\n" << logofs_flush;
+ #endif
+
+ return 0;
+ }
+
+ shift = (big_endian == 1 ? 0 : 3);
+
+ for (i = 0; i < count; i++)
+ {
+ *(dst_data + shift) = *(alpha -> data + i);
+
+ dst_data += 4;
+ }
+
+ return 1;
+}