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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;
}
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