84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
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/*
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** Command & Conquer Red Alert(tm)
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** Copyright 2025 Electronic Arts Inc.
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**
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** This program is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "function.h"
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extern "C" {
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#include "soscomp.h"
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#include "itable.cpp"
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#include "dtable.cpp"
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void sosCODECInitStream(_SOS_COMPRESS_INFO* info)
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{
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info->dwSampleIndex = 0;
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info->dwPredicted = 0;
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}
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unsigned long sosCODECDecompressData(_SOS_COMPRESS_INFO* info, unsigned long numbytes)
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{
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unsigned long token;
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long sample;
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unsigned int fastindex;
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unsigned char *inbuff;
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unsigned short *outbuff;
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inbuff = (unsigned char *)info->lpSource;
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outbuff = (unsigned short *)info->lpDest;
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// Preload variables before the big loop
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fastindex = (unsigned int)info->dwSampleIndex;
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sample = info->dwPredicted;
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if (!numbytes)
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goto SkipLoop;
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do {
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// First nibble
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token = *inbuff++;
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fastindex += token & 0x0f;
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sample += DiffTable[fastindex];
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fastindex = IndexTable[fastindex];
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if (sample > 32767L)
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sample = 32767L;
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if (sample < -32768L)
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sample = -32768L;
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*outbuff++ = (unsigned short)sample;
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// Second nibble
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fastindex += token >> 4;
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sample += DiffTable[fastindex];
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fastindex = IndexTable[fastindex];
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if (sample > 32767L)
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sample = 32767L;
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if (sample < -32768L)
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sample = -32768L;
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*outbuff++ = (unsigned short)sample;
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} while(--numbytes);
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SkipLoop:
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// Put local vars back
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info->dwSampleIndex = (unsigned long)fastindex;
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info->dwPredicted = sample;
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return(numbytes << 2);
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}
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}
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