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Diffstat (limited to 'nxcomp/src/Alpha.cpp')
| -rw-r--r-- | nxcomp/src/Alpha.cpp | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/nxcomp/src/Alpha.cpp b/nxcomp/src/Alpha.cpp new file mode 100644 index 000000000..6157e21e5 --- /dev/null +++ b/nxcomp/src/Alpha.cpp @@ -0,0 +1,138 @@ +/**************************************************************************/ +/* */ +/* Copyright (c) 2001, 2011 NoMachine (http://www.nomachine.com) */ +/* Copyright (c) 2008-2014 Oleksandr Shneyder <o.shneyder@phoca-gmbh.de> */ +/* Copyright (c) 2014-2016 Ulrich Sibiller <uli42@gmx.de> */ +/* Copyright (c) 2014-2016 Mihai Moldovan <ionic@ionic.de> */ +/* Copyright (c) 2011-2016 Mike Gabriel <mike.gabriel@das-netzwerkteam.de>*/ +/* Copyright (c) 2015-2016 Qindel Group (http://www.qindel.com) */ +/* */ +/* NXCOMP, NX protocol compression and NX extensions to this software */ +/* are copyright of the aforementioned persons and companies. */ +/* */ +/* Redistribution and use of the present software is allowed according */ +/* to terms specified in the file LICENSE.nxcomp which comes in the */ +/* source distribution. */ +/* */ +/* All rights reserved. */ +/* */ +/* NOTE: This software has received contributions from various other */ +/* contributors, only the core maintainers and supporters are listed as */ +/* copyright holders. Please contact us, if you feel you should be listed */ +/* as copyright holder, as well. */ +/* */ +/**************************************************************************/ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#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; +} |