winamp/Src/external_dependencies/openmpt-trunk/soundlib/ContainerXPK.cpp

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2024-09-24 12:54:57 +00:00
/*
* ContainerXPK.cpp
* ----------------
* Purpose: Handling of XPK compressed modules
* Notes : (currently none)
* Authors: Olivier Lapicque
* OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#include "stdafx.h"
#include "../common/FileReader.h"
#include "Container.h"
#include "Sndfile.h"
#include <stdexcept>
OPENMPT_NAMESPACE_BEGIN
#if !defined(MPT_WITH_ANCIENT)
#ifdef MPT_ALL_LOGGING
#define MMCMP_LOG
#endif
struct XPKFILEHEADER
{
char XPKF[4];
uint32be SrcLen;
char SQSH[4];
uint32be DstLen;
char Name[16];
uint32be Reserved;
};
MPT_BINARY_STRUCT(XPKFILEHEADER, 36)
struct XPK_error : public std::range_error
{
XPK_error() : std::range_error("invalid XPK data") { }
};
struct XPK_BufferBounds
{
const uint8 *pSrcBeg;
std::size_t SrcSize;
inline uint8 SrcRead(std::size_t index)
{
if(index >= SrcSize) throw XPK_error();
return pSrcBeg[index];
}
};
static int32 bfextu(std::size_t p, int32 bo, int32 bc, XPK_BufferBounds &bufs)
{
uint32 r;
p += bo / 8;
r = bufs.SrcRead(p); p++;
r <<= 8;
r |= bufs.SrcRead(p); p++;
r <<= 8;
r |= bufs.SrcRead(p);
r <<= bo % 8;
r &= 0xffffff;
r >>= 24 - bc;
return r;
}
static int32 bfexts(std::size_t p, int32 bo, int32 bc, XPK_BufferBounds &bufs)
{
uint32 r;
p += bo / 8;
r = bufs.SrcRead(p); p++;
r <<= 8;
r |= bufs.SrcRead(p); p++;
r <<= 8;
r |= bufs.SrcRead(p);
r <<= (bo % 8) + 8;
return mpt::rshift_signed(static_cast<int32>(r), 32 - bc);
}
static uint8 XPK_ReadTable(int32 index)
{
static constexpr uint8 xpk_table[] = {
2,3,4,5,6,7,8,0,3,2,4,5,6,7,8,0,4,3,5,2,6,7,8,0,5,4,6,2,3,7,8,0,6,5,7,2,3,4,8,0,7,6,8,2,3,4,5,0,8,7,6,2,3,4,5,0
};
if(index < 0) throw XPK_error();
if(static_cast<std::size_t>(index) >= std::size(xpk_table)) throw XPK_error();
return xpk_table[index];
}
static bool XPK_DoUnpack(const uint8 *src_, uint32 srcLen, std::vector<char> &unpackedData, int32 len)
{
if(len <= 0) return false;
int32 d0,d1,d2,d3,d4,d5,d6,a2,a5;
int32 cp, cup1, type;
std::size_t c;
std::size_t src;
std::size_t phist = 0;
unpackedData.reserve(std::min(static_cast<uint32>(len), std::min(srcLen, uint32_max / 20u) * 20u));
XPK_BufferBounds bufs;
bufs.pSrcBeg = src_;
bufs.SrcSize = srcLen;
src = 0;
c = src;
while(len > 0)
{
type = bufs.SrcRead(c+0);
cp = (bufs.SrcRead(c+4)<<8) | (bufs.SrcRead(c+5)); // packed
cup1 = (bufs.SrcRead(c+6)<<8) | (bufs.SrcRead(c+7)); // unpacked
//Log(" packed=%6d unpacked=%6d bytes left=%d dst=%08X(%d)\n", cp, cup1, len, dst, dst);
c += 8;
src = c+2;
if (type == 0)
{
// RAW chunk
if(cp < 0 || cp > len) throw XPK_error();
for(int32 i = 0; i < cp; ++i)
{
unpackedData.push_back(bufs.SrcRead(c + i));
}
c+=cp;
len -= cp;
continue;
}
if (type != 1)
{
#ifdef MMCMP_LOG
MPT_LOG_GLOBAL(LogDebug, "XPK", MPT_UFORMAT("Invalid XPK type! ({} bytes left)")(len));
#endif
break;
}
LimitMax(cup1, len);
len -= cup1;
cp = (cp + 3) & 0xfffc;
c += cp;
d0 = d1 = d2 = a2 = 0;
d3 = bufs.SrcRead(src); src++;
unpackedData.push_back(static_cast<char>(d3));
cup1--;
while (cup1 > 0)
{
if (d1 >= 8) goto l6dc;
if (bfextu(src,d0,1,bufs)) goto l75a;
d0 += 1;
d5 = 0;
d6 = 8;
goto l734;
l6dc:
if (bfextu(src,d0,1,bufs)) goto l726;
d0 += 1;
if (! bfextu(src,d0,1,bufs)) goto l75a;
d0 += 1;
if (bfextu(src,d0,1,bufs)) goto l6f6;
d6 = 2;
goto l708;
l6f6:
d0 += 1;
if (!bfextu(src,d0,1,bufs)) goto l706;
d6 = bfextu(src,d0,3,bufs);
d0 += 3;
goto l70a;
l706:
d6 = 3;
l708:
d0 += 1;
l70a:
d6 = XPK_ReadTable((8*a2) + d6 -17);
if (d6 != 8) goto l730;
l718:
if (d2 >= 20)
{
d5 = 1;
goto l732;
}
d5 = 0;
goto l734;
l726:
d0 += 1;
d6 = 8;
if (d6 == a2) goto l718;
d6 = a2;
l730:
d5 = 4;
l732:
d2 += 8;
l734:
while ((d5 >= 0) && (cup1 > 0))
{
d4 = bfexts(src,d0,d6,bufs);
d0 += d6;
d3 -= d4;
unpackedData.push_back(static_cast<char>(d3));
cup1--;
d5--;
}
if (d1 != 31) d1++;
a2 = d6;
l74c:
d6 = d2;
d6 >>= 3;
d2 -= d6;
}
}
return !unpackedData.empty();
l75a:
d0 += 1;
if (bfextu(src,d0,1,bufs)) goto l766;
d4 = 2;
goto l79e;
l766:
d0 += 1;
if (bfextu(src,d0,1,bufs)) goto l772;
d4 = 4;
goto l79e;
l772:
d0 += 1;
if (bfextu(src,d0,1,bufs)) goto l77e;
d4 = 6;
goto l79e;
l77e:
d0 += 1;
if (bfextu(src,d0,1,bufs)) goto l792;
d0 += 1;
d6 = bfextu(src,d0,3,bufs);
d0 += 3;
d6 += 8;
goto l7a8;
l792:
d0 += 1;
d6 = bfextu(src,d0,5,bufs);
d0 += 5;
d4 = 16;
goto l7a6;
l79e:
d0 += 1;
d6 = bfextu(src,d0,1,bufs);
d0 += 1;
l7a6:
d6 += d4;
l7a8:
if(bfextu(src, d0, 1, bufs))
{
d5 = 12;
a5 = -0x100;
} else
{
d0 += 1;
if(bfextu(src, d0, 1, bufs))
{
d5 = 14;
a5 = -0x1100;
} else
{
d5 = 8;
a5 = 0;
}
}
d0 += 1;
d4 = bfextu(src,d0,d5,bufs);
d0 += d5;
d6 -= 3;
if (d6 >= 0)
{
if (d6 > 0) d1 -= 1;
d1 -= 1;
if (d1 < 0) d1 = 0;
}
d6 += 2;
phist = unpackedData.size() + a5 - d4 - 1;
if(phist >= unpackedData.size())
throw XPK_error();
while ((d6 >= 0) && (cup1 > 0))
{
d3 = unpackedData[phist];
phist++;
unpackedData.push_back(static_cast<char>(d3));
cup1--;
d6--;
}
goto l74c;
}
static bool ValidateHeader(const XPKFILEHEADER &header)
{
if(std::memcmp(header.XPKF, "XPKF", 4) != 0)
{
return false;
}
if(std::memcmp(header.SQSH, "SQSH", 4) != 0)
{
return false;
}
if(header.SrcLen == 0)
{
return false;
}
if(header.DstLen == 0)
{
return false;
}
static_assert(sizeof(XPKFILEHEADER) >= 8);
if(header.SrcLen < (sizeof(XPKFILEHEADER) - 8))
{
return false;
}
return true;
}
static bool ValidateHeaderFileSize(const XPKFILEHEADER &header, uint64 filesize)
{
if(filesize < header.SrcLen - 8)
{
return false;
}
return true;
}
CSoundFile::ProbeResult CSoundFile::ProbeFileHeaderXPK(MemoryFileReader file, const uint64 *pfilesize)
{
XPKFILEHEADER header;
if(!file.ReadStruct(header))
{
return ProbeWantMoreData;
}
if(!ValidateHeader(header))
{
return ProbeFailure;
}
if(pfilesize)
{
if(!ValidateHeaderFileSize(header, *pfilesize))
{
return ProbeFailure;
}
}
return ProbeSuccess;
}
bool UnpackXPK(std::vector<ContainerItem> &containerItems, FileReader &file, ContainerLoadingFlags loadFlags)
{
file.Rewind();
containerItems.clear();
XPKFILEHEADER header;
if(!file.ReadStruct(header))
{
return false;
}
if(!ValidateHeader(header))
{
return false;
}
if(loadFlags == ContainerOnlyVerifyHeader)
{
return true;
}
if(!file.CanRead(header.SrcLen - (sizeof(XPKFILEHEADER) - 8)))
{
return false;
}
containerItems.emplace_back();
containerItems.back().data_cache = std::make_unique<std::vector<char> >();
std::vector<char> & unpackedData = *(containerItems.back().data_cache);
#ifdef MMCMP_LOG
MPT_LOG_GLOBAL(LogDebug, "XPK", MPT_UFORMAT("XPK detected (SrcLen={} DstLen={}) filesize={}")(static_cast<uint32>(header.SrcLen), static_cast<uint32>(header.DstLen), file.GetLength()));
#endif
bool result = false;
try
{
result = XPK_DoUnpack(file.GetRawData<uint8>().data(), header.SrcLen - (sizeof(XPKFILEHEADER) - 8), unpackedData, header.DstLen);
} catch(mpt::out_of_memory e)
{
mpt::delete_out_of_memory(e);
return false;
} catch(const XPK_error &)
{
return false;
}
if(result)
{
containerItems.back().file = FileReader(mpt::byte_cast<mpt::const_byte_span>(mpt::as_span(unpackedData)));
}
return result;
}
#endif // !MPT_WITH_ANCIENT
OPENMPT_NAMESPACE_END