mirror of
https://github.com/WinampDesktop/winamp.git
synced 2024-12-12 15:01:01 -05:00
391 lines
9.8 KiB
C++
391 lines
9.8 KiB
C++
/*
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* ContainerMMCMP.cpp
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* ------------------
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* Purpose: Handling of MMCMP compressed modules
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* Notes : (currently none)
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* Authors: Olivier Lapicque
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* OpenMPT Devs
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* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
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*/
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#include "stdafx.h"
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#include "../common/FileReader.h"
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#include "Container.h"
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#include "Sndfile.h"
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#include "BitReader.h"
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OPENMPT_NAMESPACE_BEGIN
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#if !defined(MPT_WITH_ANCIENT)
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#ifdef MPT_ALL_LOGGING
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#define MMCMP_LOG
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#endif
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struct MMCMPFileHeader
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{
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char id[8]; // "ziRCONia"
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uint16le hdrsize; // size of all the remaining header data
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uint16le version;
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uint16le nblocks;
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uint32le filesize;
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uint32le blktable;
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uint8le glb_comp;
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uint8le fmt_comp;
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bool Validate() const
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{
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if(std::memcmp(id, "ziRCONia", 8) != 0)
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return false;
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if(hdrsize != 14)
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return false;
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if(nblocks == 0)
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return false;
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if(filesize == 0)
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return false;
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if(filesize >= 0x80000000)
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return false;
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if(blktable < sizeof(MMCMPFileHeader))
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return false;
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return true;
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}
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};
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MPT_BINARY_STRUCT(MMCMPFileHeader, 24)
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struct MMCMPBlock
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{
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uint32le unpk_size;
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uint32le pk_size;
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uint32le xor_chk;
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uint16le sub_blk;
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uint16le flags;
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uint16le tt_entries;
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uint16le num_bits;
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};
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MPT_BINARY_STRUCT(MMCMPBlock, 20)
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struct MMCMPSubBlock
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{
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uint32le position;
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uint32le size;
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bool Validate(std::vector<char> &unpackedData, const uint32 unpackedSize) const
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{
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if(position >= unpackedSize)
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return false;
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if(size > unpackedSize)
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return false;
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if(size > unpackedSize - position)
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return false;
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if(size == 0)
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return false;
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if(unpackedData.size() < position + size)
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unpackedData.resize(position + size);
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return true;
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}
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};
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MPT_BINARY_STRUCT(MMCMPSubBlock, 8)
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enum MMCMPFlags : uint16
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{
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MMCMP_COMP = 0x0001,
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MMCMP_DELTA = 0x0002,
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MMCMP_16BIT = 0x0004,
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MMCMP_STEREO = 0x0100,
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MMCMP_ABS16 = 0x0200,
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MMCMP_ENDIAN = 0x0400,
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};
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static constexpr uint8 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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static constexpr uint8 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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static constexpr uint16 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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static constexpr uint8 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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CSoundFile::ProbeResult CSoundFile::ProbeFileHeaderMMCMP(MemoryFileReader file, const uint64 *pfilesize)
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{
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MMCMPFileHeader mfh;
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if(!file.ReadStruct(mfh))
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return ProbeWantMoreData;
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if(!mfh.Validate())
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return ProbeFailure;
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MPT_UNREFERENCED_PARAMETER(pfilesize);
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return ProbeSuccess;
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}
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bool UnpackMMCMP(std::vector<ContainerItem> &containerItems, FileReader &file, ContainerLoadingFlags loadFlags)
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{
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file.Rewind();
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containerItems.clear();
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MMCMPFileHeader mfh;
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if(!file.ReadStruct(mfh))
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return false;
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if(!mfh.Validate())
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return false;
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if(loadFlags == ContainerOnlyVerifyHeader)
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return true;
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if(!file.LengthIsAtLeast(mfh.blktable))
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return false;
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if(!file.LengthIsAtLeast(mfh.blktable + 4 * mfh.nblocks))
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return false;
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containerItems.emplace_back();
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containerItems.back().data_cache = std::make_unique<std::vector<char> >();
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auto &unpackedData = *(containerItems.back().data_cache);
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// Generally it's not so simple to establish an upper limit for the uncompressed data size (blocks can be reused, etc.),
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// so we just reserve a realistic amount of memory.
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const uint32 unpackedSize = mfh.filesize;
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unpackedData.reserve(std::min(unpackedSize, std::min(mpt::saturate_cast<uint32>(file.GetLength()), uint32_max / 20u) * 20u));
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// 8-bit deltas
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uint8 ptable[256] = { 0 };
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std::vector<MMCMPSubBlock> subblks;
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for(uint32 nBlock = 0; nBlock < mfh.nblocks; nBlock++)
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{
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if(!file.Seek(mfh.blktable + 4 * nBlock))
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return false;
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if(!file.CanRead(4))
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return false;
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uint32 blkPos = file.ReadUint32LE();
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if(!file.Seek(blkPos))
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return false;
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MMCMPBlock blk;
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if(!file.ReadStruct(blk))
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return false;
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if(!file.ReadVector(subblks, blk.sub_blk))
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return false;
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const MMCMPSubBlock *psubblk = blk.sub_blk > 0 ? subblks.data() : nullptr;
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if(blkPos + sizeof(MMCMPBlock) + blk.sub_blk * sizeof(MMCMPSubBlock) >= file.GetLength())
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return false;
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uint32 memPos = blkPos + sizeof(MMCMPBlock) + blk.sub_blk * sizeof(MMCMPSubBlock);
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#ifdef MMCMP_LOG
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MPT_LOG_GLOBAL(LogDebug, "MMCMP", MPT_UFORMAT("block {}: flags={} sub_blocks={}")(nBlock, mpt::ufmt::HEX0<4>(static_cast<uint16>(blk.flags)), static_cast<uint16>(blk.sub_blk)));
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MPT_LOG_GLOBAL(LogDebug, "MMCMP", MPT_UFORMAT(" pksize={} unpksize={}")(static_cast<uint32>(blk.pk_size), static_cast<uint32>(blk.unpk_size)));
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MPT_LOG_GLOBAL(LogDebug, "MMCMP", MPT_UFORMAT(" tt_entries={} num_bits={}")(static_cast<uint16>(blk.tt_entries), static_cast<uint16>(blk.num_bits)));
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#endif
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if(!(blk.flags & MMCMP_COMP))
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{
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// Data is not packed
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for(uint32 i = 0; i < blk.sub_blk; i++)
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{
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if(!psubblk)
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return false;
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if(!psubblk->Validate(unpackedData, unpackedSize))
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return false;
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#ifdef MMCMP_LOG
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MPT_LOG_GLOBAL(LogDebug, "MMCMP", MPT_UFORMAT(" Unpacked sub-block {}: offset {}, size={}")(i, static_cast<uint32>(psubblk->position), static_cast<uint32>(psubblk->size)));
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#endif
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if(!file.Seek(memPos))
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return false;
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if(file.ReadRaw(mpt::span(&(unpackedData[psubblk->position]), psubblk->size)).size() != psubblk->size)
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return false;
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psubblk++;
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}
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} else if(blk.flags & MMCMP_16BIT)
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{
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// Data is 16-bit packed
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uint32 subblk = 0;
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if(!psubblk)
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return false;
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if(!psubblk[subblk].Validate(unpackedData, unpackedSize))
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return false;
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char *pDest = &(unpackedData[psubblk[subblk].position]);
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uint32 dwSize = psubblk[subblk].size & ~1u;
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if(!dwSize)
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return false;
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uint32 dwPos = 0;
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uint32 numbits = blk.num_bits;
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uint32 oldval = 0;
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#ifdef MMCMP_LOG
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MPT_LOG_GLOBAL(LogDebug, "MMCMP", MPT_UFORMAT(" 16-bit block: pos={} size={} {} {}")(psubblk->position, psubblk->size, (blk.flags & MMCMP_DELTA) ? U_("DELTA ") : U_(""), (blk.flags & MMCMP_ABS16) ? U_("ABS16 ") : U_("")));
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#endif
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if(!file.Seek(memPos + blk.tt_entries)) return false;
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if(!file.CanRead(blk.pk_size - blk.tt_entries)) return false;
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BitReader bitFile{ file.GetChunk(blk.pk_size - blk.tt_entries) };
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try
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{
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while (subblk < blk.sub_blk)
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{
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uint32 newval = 0x10000;
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uint32 d = bitFile.ReadBits(numbits + 1);
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uint32 command = MMCMP16BitCommands[numbits & 0x0F];
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if(d >= command)
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{
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uint32 nFetch = MMCMP16BitFetch[numbits & 0x0F];
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uint32 newbits = bitFile.ReadBits(nFetch) + ((d - command) << nFetch);
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if(newbits != numbits)
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{
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numbits = newbits & 0x0F;
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} else if((d = bitFile.ReadBits(4)) == 0x0F)
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{
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if(bitFile.ReadBits(1))
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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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} 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) ? (uint32)(-(int32)((newval + 1) >> 1)) : (uint32)(newval >> 1);
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if(blk.flags & MMCMP_DELTA)
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{
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newval += oldval;
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oldval = newval;
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} else if(!(blk.flags & MMCMP_ABS16))
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{
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newval ^= 0x8000;
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}
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if(blk.flags & MMCMP_ENDIAN)
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{
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pDest[dwPos + 0] = static_cast<uint8>(newval >> 8);
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pDest[dwPos + 1] = static_cast<uint8>(newval & 0xFF);
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} else
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{
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pDest[dwPos + 0] = static_cast<uint8>(newval & 0xFF);
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pDest[dwPos + 1] = static_cast<uint8>(newval >> 8);
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}
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dwPos += 2;
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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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if(!(subblk < blk.sub_blk))
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break;
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if(!psubblk[subblk].Validate(unpackedData, unpackedSize))
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return false;
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dwSize = psubblk[subblk].size & ~1u;
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if(!dwSize)
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return false;
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pDest = &(unpackedData[psubblk[subblk].position]);
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}
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}
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} catch(const BitReader::eof &)
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{
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}
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} else
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{
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// Data is 8-bit packed
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uint32 subblk = 0;
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if(!psubblk)
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return false;
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if(!psubblk[subblk].Validate(unpackedData, unpackedSize))
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return false;
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char *pDest = &(unpackedData[psubblk[subblk].position]);
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uint32 dwSize = psubblk[subblk].size;
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uint32 dwPos = 0;
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uint32 numbits = blk.num_bits;
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uint32 oldval = 0;
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if(blk.tt_entries > sizeof(ptable)
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|| !file.Seek(memPos)
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|| file.ReadRaw(mpt::span(ptable, blk.tt_entries)).size() < blk.tt_entries)
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return false;
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if(!file.CanRead(blk.pk_size - blk.tt_entries)) return false;
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BitReader bitFile{ file.GetChunk(blk.pk_size - blk.tt_entries) };
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try
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{
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while (subblk < blk.sub_blk)
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{
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uint32 newval = 0x100;
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uint32 d = bitFile.ReadBits(numbits + 1);
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uint32 command = MMCMP8BitCommands[numbits & 0x07];
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if(d >= command)
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{
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uint32 nFetch = MMCMP8BitFetch[numbits & 0x07];
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uint32 newbits = bitFile.ReadBits(nFetch) + ((d - command) << nFetch);
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if(newbits != numbits)
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{
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numbits = newbits & 0x07;
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} else if((d = bitFile.ReadBits(3)) == 7)
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{
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if(bitFile.ReadBits(1))
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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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} else
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{
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newval = d;
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}
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if(newval < sizeof(ptable))
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{
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int n = ptable[newval];
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if(blk.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++] = static_cast<uint8>(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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if(!(subblk < blk.sub_blk))
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break;
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if(!psubblk[subblk].Validate(unpackedData, unpackedSize))
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return false;
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dwSize = psubblk[subblk].size;
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pDest = &(unpackedData[psubblk[subblk].position]);
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}
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}
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} catch(const BitReader::eof &)
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{
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}
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}
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}
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containerItems.back().file = FileReader(mpt::byte_cast<mpt::const_byte_span>(mpt::as_span(unpackedData)));
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return true;
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}
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#endif // !MPT_WITH_ANCIENT
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OPENMPT_NAMESPACE_END
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