mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-08 18:39:54 +00:00
406 lines
9.2 KiB
C++
406 lines
9.2 KiB
C++
/*
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* This source code is public domain.
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*
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* Authors: Olivier Lapicque <olivierl@jps.net>
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*/
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#include "stdafx.h"
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#include "sndfile.h"
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BOOL PP20_Unpack(LPCBYTE *ppMemFile, LPDWORD pdwMemLength);
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typedef struct MMCMPFILEHEADER
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{
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DWORD id_ziRC; // "ziRC"
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DWORD id_ONia; // "ONia"
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WORD hdrsize;
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} MMCMPFILEHEADER, *LPMMCMPFILEHEADER;
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typedef struct MMCMPHEADER
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{
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WORD version;
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WORD nblocks;
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DWORD filesize;
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DWORD blktable;
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BYTE glb_comp;
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BYTE fmt_comp;
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} MMCMPHEADER, *LPMMCMPHEADER;
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typedef struct MMCMPBLOCK
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{
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DWORD unpk_size;
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DWORD pk_size;
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DWORD xor_chk;
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WORD sub_blk;
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WORD flags;
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WORD tt_entries;
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WORD num_bits;
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} MMCMPBLOCK, *LPMMCMPBLOCK;
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typedef struct MMCMPSUBBLOCK
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{
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DWORD unpk_pos;
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DWORD unpk_size;
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} MMCMPSUBBLOCK, *LPMMCMPSUBBLOCK;
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#define MMCMP_COMP 0x0001
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#define MMCMP_DELTA 0x0002
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#define MMCMP_16BIT 0x0004
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#define MMCMP_STEREO 0x0100
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#define MMCMP_ABS16 0x0200
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#define MMCMP_ENDIAN 0x0400
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typedef struct MMCMPBITBUFFER
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{
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UINT bitcount;
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DWORD bitbuffer;
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LPCBYTE pSrc;
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LPCBYTE pEnd;
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DWORD GetBits(UINT nBits);
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} MMCMPBITBUFFER;
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DWORD MMCMPBITBUFFER::GetBits(UINT nBits)
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//---------------------------------------
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{
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DWORD d;
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if (!nBits) return 0;
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while (bitcount < 24)
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{
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bitbuffer |= ((pSrc < pEnd) ? *pSrc++ : 0) << bitcount;
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bitcount += 8;
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}
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d = bitbuffer & ((1 << nBits) - 1);
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bitbuffer >>= nBits;
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bitcount -= nBits;
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return d;
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}
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//#define MMCMP_LOG
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#ifdef MMCMP_LOG
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extern void Log(LPCSTR s, ...);
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#endif
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const DWORD MMCMP8BitCommands[8] =
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{
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0x01, 0x03, 0x07, 0x0F, 0x1E, 0x3C, 0x78, 0xF8
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};
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const UINT MMCMP8BitFetch[8] =
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{
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3, 3, 3, 3, 2, 1, 0, 0
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};
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const DWORD MMCMP16BitCommands[16] =
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{
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0x01, 0x03, 0x07, 0x0F, 0x1E, 0x3C, 0x78, 0xF0,
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0x1F0, 0x3F0, 0x7F0, 0xFF0, 0x1FF0, 0x3FF0, 0x7FF0, 0xFFF0
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};
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const UINT MMCMP16BitFetch[16] =
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{
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4, 4, 4, 4, 3, 2, 1, 0,
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0, 0, 0, 0, 0, 0, 0, 0
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};
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BOOL MMCMP_Unpack(LPCBYTE *ppMemFile, LPDWORD pdwMemLength)
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//---------------------------------------------------------
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{
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DWORD dwMemLength = *pdwMemLength;
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LPCBYTE lpMemFile = *ppMemFile;
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LPBYTE pBuffer;
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LPMMCMPFILEHEADER pmfh = (LPMMCMPFILEHEADER)(lpMemFile);
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LPMMCMPHEADER pmmh = (LPMMCMPHEADER)(lpMemFile+10);
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LPDWORD pblk_table;
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DWORD dwFileSize;
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if (PP20_Unpack(ppMemFile, pdwMemLength))
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{
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return TRUE;
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}
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if ((dwMemLength < 256) || (!pmfh) || (pmfh->id_ziRC != 0x4352697A) || (pmfh->id_ONia != 0x61694e4f) || (pmfh->hdrsize < 14)
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|| (!pmmh->nblocks) || (pmmh->filesize < 16) || (pmmh->filesize > 0x8000000)
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|| (pmmh->blktable >= dwMemLength) || (pmmh->blktable + 4*pmmh->nblocks > dwMemLength)) return FALSE;
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dwFileSize = pmmh->filesize;
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if ((pBuffer = (LPBYTE)GlobalAllocPtr(GHND, (dwFileSize + 31) & ~15)) == NULL) return FALSE;
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pblk_table = (LPDWORD)(lpMemFile+pmmh->blktable);
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for (UINT nBlock=0; nBlock<pmmh->nblocks; nBlock++)
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{
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DWORD dwMemPos = pblk_table[nBlock];
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LPMMCMPBLOCK pblk = (LPMMCMPBLOCK)(lpMemFile+dwMemPos);
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LPMMCMPSUBBLOCK psubblk = (LPMMCMPSUBBLOCK)(lpMemFile+dwMemPos+20);
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if ((dwMemPos + 20 >= dwMemLength) || (dwMemPos + 20 + pblk->sub_blk*8 >= dwMemLength)) break;
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dwMemPos += 20 + pblk->sub_blk*8;
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#ifdef MMCMP_LOG
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Log("block %d: flags=%04X sub_blocks=%d", nBlock, (UINT)pblk->flags, (UINT)pblk->sub_blk);
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Log(" pksize=%d unpksize=%d", pblk->pk_size, pblk->unpk_size);
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Log(" tt_entries=%d num_bits=%d\n", pblk->tt_entries, pblk->num_bits);
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#endif
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// Data is not packed
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if (!(pblk->flags & MMCMP_COMP))
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{
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for (UINT i=0; i<pblk->sub_blk; i++)
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{
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if ((psubblk->unpk_pos > dwFileSize) || (psubblk->unpk_pos + psubblk->unpk_size > dwFileSize)) break;
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#ifdef MMCMP_LOG
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Log(" Unpacked sub-block %d: offset %d, size=%d\n", i, psubblk->unpk_pos, psubblk->unpk_size);
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#endif
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memcpy(pBuffer+psubblk->unpk_pos, lpMemFile+dwMemPos, psubblk->unpk_size);
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dwMemPos += psubblk->unpk_size;
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psubblk++;
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}
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} else
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// Data is 16-bit packed
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if (pblk->flags & MMCMP_16BIT)
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{
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MMCMPBITBUFFER bb;
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LPWORD pDest = (LPWORD)(pBuffer + psubblk->unpk_pos);
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DWORD dwSize = psubblk->unpk_size >> 1;
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DWORD dwPos = 0;
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UINT numbits = pblk->num_bits;
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UINT subblk = 0, oldval = 0;
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#ifdef MMCMP_LOG
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Log(" 16-bit block: pos=%d size=%d ", psubblk->unpk_pos, psubblk->unpk_size);
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if (pblk->flags & MMCMP_DELTA) Log("DELTA ");
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if (pblk->flags & MMCMP_ABS16) Log("ABS16 ");
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Log("\n");
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#endif
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bb.bitcount = 0;
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bb.bitbuffer = 0;
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bb.pSrc = lpMemFile+dwMemPos+pblk->tt_entries;
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bb.pEnd = lpMemFile+dwMemPos+pblk->pk_size;
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while (subblk < pblk->sub_blk)
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{
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UINT newval = 0x10000;
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DWORD d = bb.GetBits(numbits+1);
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if (d >= MMCMP16BitCommands[numbits])
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{
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UINT nFetch = MMCMP16BitFetch[numbits];
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UINT newbits = bb.GetBits(nFetch) + ((d - MMCMP16BitCommands[numbits]) << nFetch);
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if (newbits != numbits)
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{
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numbits = newbits & 0x0F;
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} else
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{
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if ((d = bb.GetBits(4)) == 0x0F)
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{
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if (bb.GetBits(1)) break;
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newval = 0xFFFF;
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} else
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{
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newval = 0xFFF0 + d;
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}
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}
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} else
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{
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newval = d;
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}
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if (newval < 0x10000)
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{
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newval = (newval & 1) ? (UINT)(-(LONG)((newval+1) >> 1)) : (UINT)(newval >> 1);
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if (pblk->flags & MMCMP_DELTA)
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{
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newval += oldval;
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oldval = newval;
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} else
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if (!(pblk->flags & MMCMP_ABS16))
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{
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newval ^= 0x8000;
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}
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pDest[dwPos++] = (WORD)newval;
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}
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if (dwPos >= dwSize)
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{
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subblk++;
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dwPos = 0;
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dwSize = psubblk[subblk].unpk_size >> 1;
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pDest = (LPWORD)(pBuffer + psubblk[subblk].unpk_pos);
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}
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}
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} else
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// Data is 8-bit packed
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{
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MMCMPBITBUFFER bb;
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LPBYTE pDest = pBuffer + psubblk->unpk_pos;
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DWORD dwSize = psubblk->unpk_size;
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DWORD dwPos = 0;
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UINT numbits = pblk->num_bits;
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UINT subblk = 0, oldval = 0;
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LPCBYTE ptable = lpMemFile+dwMemPos;
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bb.bitcount = 0;
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bb.bitbuffer = 0;
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bb.pSrc = lpMemFile+dwMemPos+pblk->tt_entries;
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bb.pEnd = lpMemFile+dwMemPos+pblk->pk_size;
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while (subblk < pblk->sub_blk)
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{
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UINT newval = 0x100;
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DWORD d = bb.GetBits(numbits+1);
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if (d >= MMCMP8BitCommands[numbits])
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{
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UINT nFetch = MMCMP8BitFetch[numbits];
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UINT newbits = bb.GetBits(nFetch) + ((d - MMCMP8BitCommands[numbits]) << nFetch);
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if (newbits != numbits)
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{
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numbits = newbits & 0x07;
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} else
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{
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if ((d = bb.GetBits(3)) == 7)
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{
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if (bb.GetBits(1)) break;
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newval = 0xFF;
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} else
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{
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newval = 0xF8 + d;
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}
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}
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} else
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{
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newval = d;
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}
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if (newval < 0x100)
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{
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int n = ptable[newval];
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if (pblk->flags & MMCMP_DELTA)
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{
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n += oldval;
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oldval = n;
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}
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pDest[dwPos++] = (BYTE)n;
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}
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if (dwPos >= dwSize)
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{
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subblk++;
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dwPos = 0;
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dwSize = psubblk[subblk].unpk_size;
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pDest = pBuffer + psubblk[subblk].unpk_pos;
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}
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}
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}
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}
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*ppMemFile = pBuffer;
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*pdwMemLength = dwFileSize;
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return TRUE;
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}
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//////////////////////////////////////////////////////////////////////////////
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//
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// PowerPack PP20 Unpacker
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//
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typedef struct _PPBITBUFFER
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{
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UINT bitcount;
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ULONG bitbuffer;
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LPCBYTE pStart;
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LPCBYTE pSrc;
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ULONG GetBits(UINT n);
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} PPBITBUFFER;
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ULONG PPBITBUFFER::GetBits(UINT n)
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{
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ULONG result = 0;
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for (UINT i=0; i<n; i++)
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{
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if (!bitcount)
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{
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bitcount = 8;
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if (pSrc != pStart) pSrc--;
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bitbuffer = *pSrc;
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}
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result = (result<<1) | (bitbuffer&1);
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bitbuffer >>= 1;
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bitcount--;
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}
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return result;
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}
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VOID PP20_DoUnpack(const BYTE *pSrc, UINT nSrcLen, BYTE *pDst, UINT nDstLen)
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{
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PPBITBUFFER BitBuffer;
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ULONG nBytesLeft;
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BitBuffer.pStart = pSrc;
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BitBuffer.pSrc = pSrc + nSrcLen - 4;
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BitBuffer.bitbuffer = 0;
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BitBuffer.bitcount = 0;
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BitBuffer.GetBits(pSrc[nSrcLen-1]);
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nBytesLeft = nDstLen;
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while (nBytesLeft > 0)
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{
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if (!BitBuffer.GetBits(1))
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{
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UINT n = 1;
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while (n < nBytesLeft)
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{
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UINT code = BitBuffer.GetBits(2);
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n += code;
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if (code != 3) break;
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}
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for (UINT i=0; i<n; i++)
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{
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pDst[--nBytesLeft] = (BYTE)BitBuffer.GetBits(8);
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}
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if (!nBytesLeft) break;
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}
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{
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UINT n = BitBuffer.GetBits(2)+1;
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UINT nbits = pSrc[n-1];
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UINT nofs;
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if (n==4)
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{
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nofs = BitBuffer.GetBits( (BitBuffer.GetBits(1)) ? nbits : 7 );
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while (n < nBytesLeft)
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{
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UINT code = BitBuffer.GetBits(3);
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n += code;
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if (code != 7) break;
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}
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} else
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{
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nofs = BitBuffer.GetBits(nbits);
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}
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for (UINT i=0; i<=n; i++)
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{
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pDst[nBytesLeft-1] = (nBytesLeft+nofs < nDstLen) ? pDst[nBytesLeft+nofs] : 0;
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if (!--nBytesLeft) break;
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}
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}
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}
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}
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BOOL PP20_Unpack(LPCBYTE *ppMemFile, LPDWORD pdwMemLength)
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{
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DWORD dwMemLength = *pdwMemLength;
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LPCBYTE lpMemFile = *ppMemFile;
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DWORD dwDstLen;
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LPBYTE pBuffer;
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if ((!lpMemFile) || (dwMemLength < 256) || (*(DWORD *)lpMemFile != 0x30325050)) return FALSE;
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dwDstLen = (lpMemFile[dwMemLength-4]<<16) | (lpMemFile[dwMemLength-3]<<8) | (lpMemFile[dwMemLength-2]);
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//Log("PP20 detected: Packed length=%d, Unpacked length=%d\n", dwMemLength, dwDstLen);
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if ((dwDstLen < 512) || (dwDstLen > 0x400000) || (dwDstLen > 16*dwMemLength)) return FALSE;
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if ((pBuffer = (LPBYTE)GlobalAllocPtr(GHND, (dwDstLen + 31) & ~15)) == NULL) return FALSE;
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PP20_DoUnpack(lpMemFile+4, dwMemLength-4, pBuffer, dwDstLen);
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*ppMemFile = pBuffer;
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*pdwMemLength = dwDstLen;
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return TRUE;
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}
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