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7zArcIn.c
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/* 7zArcIn.c -- 7z Input functions
2023-09-07 : Igor Pavlov : Public domain */
#include "Precomp.h"
#include <string.h>
#include "7z.h"
#include "7zBuf.h"
#include "7zCrc.h"
#include "CpuArch.h"
#define MY_ALLOC(T, p, size, alloc) \
{ if ((p = (T *)ISzAlloc_Alloc(alloc, (size) * sizeof(T))) == NULL) return SZ_ERROR_MEM; }
#define MY_ALLOC_ZE(T, p, size, alloc) \
{ if ((size) == 0) p = NULL; else MY_ALLOC(T, p, size, alloc) }
#define MY_ALLOC_AND_CPY(to, size, from, alloc) \
{ MY_ALLOC(Byte, to, size, alloc); memcpy(to, from, size); }
#define MY_ALLOC_ZE_AND_CPY(to, size, from, alloc) \
{ if ((size) == 0) to = NULL; else { MY_ALLOC_AND_CPY(to, size, from, alloc) } }
#define k7zMajorVersion 0
enum EIdEnum
{
k7zIdEnd,
k7zIdHeader,
k7zIdArchiveProperties,
k7zIdAdditionalStreamsInfo,
k7zIdMainStreamsInfo,
k7zIdFilesInfo,
k7zIdPackInfo,
k7zIdUnpackInfo,
k7zIdSubStreamsInfo,
k7zIdSize,
k7zIdCRC,
k7zIdFolder,
k7zIdCodersUnpackSize,
k7zIdNumUnpackStream,
k7zIdEmptyStream,
k7zIdEmptyFile,
k7zIdAnti,
k7zIdName,
k7zIdCTime,
k7zIdATime,
k7zIdMTime,
k7zIdWinAttrib,
k7zIdComment,
k7zIdEncodedHeader,
k7zIdStartPos,
k7zIdDummy
// k7zNtSecure,
// k7zParent,
// k7zIsReal
};
const Byte k7zSignature[k7zSignatureSize] = {'7', 'z', 0xBC, 0xAF, 0x27, 0x1C};
#define SzBitUi32s_INIT(p) { (p)->Defs = NULL; (p)->Vals = NULL; }
static SRes SzBitUi32s_Alloc(CSzBitUi32s *p, size_t num, ISzAllocPtr alloc)
{
if (num == 0)
{
p->Defs = NULL;
p->Vals = NULL;
}
else
{
MY_ALLOC(Byte, p->Defs, (num + 7) >> 3, alloc)
MY_ALLOC(UInt32, p->Vals, num, alloc)
}
return SZ_OK;
}
static void SzBitUi32s_Free(CSzBitUi32s *p, ISzAllocPtr alloc)
{
ISzAlloc_Free(alloc, p->Defs); p->Defs = NULL;
ISzAlloc_Free(alloc, p->Vals); p->Vals = NULL;
}
#define SzBitUi64s_INIT(p) { (p)->Defs = NULL; (p)->Vals = NULL; }
static void SzBitUi64s_Free(CSzBitUi64s *p, ISzAllocPtr alloc)
{
ISzAlloc_Free(alloc, p->Defs); p->Defs = NULL;
ISzAlloc_Free(alloc, p->Vals); p->Vals = NULL;
}
static void SzAr_Init(CSzAr *p)
{
p->NumPackStreams = 0;
p->NumFolders = 0;
p->PackPositions = NULL;
SzBitUi32s_INIT(&p->FolderCRCs)
p->FoCodersOffsets = NULL;
p->FoStartPackStreamIndex = NULL;
p->FoToCoderUnpackSizes = NULL;
p->FoToMainUnpackSizeIndex = NULL;
p->CoderUnpackSizes = NULL;
p->CodersData = NULL;
p->RangeLimit = 0;
}
static void SzAr_Free(CSzAr *p, ISzAllocPtr alloc)
{
ISzAlloc_Free(alloc, p->PackPositions);
SzBitUi32s_Free(&p->FolderCRCs, alloc);
ISzAlloc_Free(alloc, p->FoCodersOffsets);
ISzAlloc_Free(alloc, p->FoStartPackStreamIndex);
ISzAlloc_Free(alloc, p->FoToCoderUnpackSizes);
ISzAlloc_Free(alloc, p->FoToMainUnpackSizeIndex);
ISzAlloc_Free(alloc, p->CoderUnpackSizes);
ISzAlloc_Free(alloc, p->CodersData);
SzAr_Init(p);
}
void SzArEx_Init(CSzArEx *p)
{
SzAr_Init(&p->db);
p->NumFiles = 0;
p->dataPos = 0;
p->UnpackPositions = NULL;
p->IsDirs = NULL;
p->FolderToFile = NULL;
p->FileToFolder = NULL;
p->FileNameOffsets = NULL;
p->FileNames = NULL;
SzBitUi32s_INIT(&p->CRCs)
SzBitUi32s_INIT(&p->Attribs)
// SzBitUi32s_INIT(&p->Parents)
SzBitUi64s_INIT(&p->MTime)
SzBitUi64s_INIT(&p->CTime)
}
void SzArEx_Free(CSzArEx *p, ISzAllocPtr alloc)
{
ISzAlloc_Free(alloc, p->UnpackPositions);
ISzAlloc_Free(alloc, p->IsDirs);
ISzAlloc_Free(alloc, p->FolderToFile);
ISzAlloc_Free(alloc, p->FileToFolder);
ISzAlloc_Free(alloc, p->FileNameOffsets);
ISzAlloc_Free(alloc, p->FileNames);
SzBitUi32s_Free(&p->CRCs, alloc);
SzBitUi32s_Free(&p->Attribs, alloc);
// SzBitUi32s_Free(&p->Parents, alloc);
SzBitUi64s_Free(&p->MTime, alloc);
SzBitUi64s_Free(&p->CTime, alloc);
SzAr_Free(&p->db, alloc);
SzArEx_Init(p);
}
static int TestSignatureCandidate(const Byte *testBytes)
{
unsigned i;
for (i = 0; i < k7zSignatureSize; i++)
if (testBytes[i] != k7zSignature[i])
return 0;
return 1;
}
#define SzData_CLEAR(p) { (p)->Data = NULL; (p)->Size = 0; }
#define SZ_READ_BYTE_SD_NOCHECK(_sd_, dest) \
(_sd_)->Size--; dest = *(_sd_)->Data++;
#define SZ_READ_BYTE_SD(_sd_, dest) \
if ((_sd_)->Size == 0) return SZ_ERROR_ARCHIVE; \
SZ_READ_BYTE_SD_NOCHECK(_sd_, dest)
#define SZ_READ_BYTE(dest) SZ_READ_BYTE_SD(sd, dest)
#define SZ_READ_BYTE_2(dest) \
if (sd.Size == 0) return SZ_ERROR_ARCHIVE; \
sd.Size--; dest = *sd.Data++;
#define SKIP_DATA(sd, size) { sd->Size -= (size_t)(size); sd->Data += (size_t)(size); }
#define SKIP_DATA2(sd, size) { sd.Size -= (size_t)(size); sd.Data += (size_t)(size); }
#define SZ_READ_32(dest) if (sd.Size < 4) return SZ_ERROR_ARCHIVE; \
dest = GetUi32(sd.Data); SKIP_DATA2(sd, 4);
static Z7_NO_INLINE SRes ReadNumber(CSzData *sd, UInt64 *value)
{
Byte firstByte, mask;
unsigned i;
UInt32 v;
SZ_READ_BYTE(firstByte)
if ((firstByte & 0x80) == 0)
{
*value = firstByte;
return SZ_OK;
}
SZ_READ_BYTE(v)
if ((firstByte & 0x40) == 0)
{
*value = (((UInt32)firstByte & 0x3F) << 8) | v;
return SZ_OK;
}
SZ_READ_BYTE(mask)
*value = v | ((UInt32)mask << 8);
mask = 0x20;
for (i = 2; i < 8; i++)
{
Byte b;
if ((firstByte & mask) == 0)
{
const UInt64 highPart = (unsigned)firstByte & (unsigned)(mask - 1);
*value |= (highPart << (8 * i));
return SZ_OK;
}
SZ_READ_BYTE(b)
*value |= ((UInt64)b << (8 * i));
mask >>= 1;
}
return SZ_OK;
}
static Z7_NO_INLINE SRes SzReadNumber32(CSzData *sd, UInt32 *value)
{
Byte firstByte;
UInt64 value64;
if (sd->Size == 0)
return SZ_ERROR_ARCHIVE;
firstByte = *sd->Data;
if ((firstByte & 0x80) == 0)
{
*value = firstByte;
sd->Data++;
sd->Size--;
return SZ_OK;
}
RINOK(ReadNumber(sd, &value64))
if (value64 >= (UInt32)0x80000000 - 1)
return SZ_ERROR_UNSUPPORTED;
if (value64 >= ((UInt64)(1) << ((sizeof(size_t) - 1) * 8 + 4)))
return SZ_ERROR_UNSUPPORTED;
*value = (UInt32)value64;
return SZ_OK;
}
#define ReadID(sd, value) ReadNumber(sd, value)
static SRes SkipData(CSzData *sd)
{
UInt64 size;
RINOK(ReadNumber(sd, &size))
if (size > sd->Size)
return SZ_ERROR_ARCHIVE;
SKIP_DATA(sd, size)
return SZ_OK;
}
static SRes WaitId(CSzData *sd, UInt32 id)
{
for (;;)
{
UInt64 type;
RINOK(ReadID(sd, &type))
if (type == id)
return SZ_OK;
if (type == k7zIdEnd)
return SZ_ERROR_ARCHIVE;
RINOK(SkipData(sd))
}
}
static SRes RememberBitVector(CSzData *sd, UInt32 numItems, const Byte **v)
{
const UInt32 numBytes = (numItems + 7) >> 3;
if (numBytes > sd->Size)
return SZ_ERROR_ARCHIVE;
*v = sd->Data;
SKIP_DATA(sd, numBytes)
return SZ_OK;
}
static UInt32 CountDefinedBits(const Byte *bits, UInt32 numItems)
{
unsigned b = 0;
unsigned m = 0;
UInt32 sum = 0;
for (; numItems != 0; numItems--)
{
if (m == 0)
{
b = *bits++;
m = 8;
}
m--;
sum += (UInt32)((b >> m) & 1);
}
return sum;
}
static Z7_NO_INLINE SRes ReadBitVector(CSzData *sd, UInt32 numItems, Byte **v, ISzAllocPtr alloc)
{
Byte allAreDefined;
Byte *v2;
const UInt32 numBytes = (numItems + 7) >> 3;
*v = NULL;
SZ_READ_BYTE(allAreDefined)
if (numBytes == 0)
return SZ_OK;
if (allAreDefined == 0)
{
if (numBytes > sd->Size)
return SZ_ERROR_ARCHIVE;
MY_ALLOC_AND_CPY(*v, numBytes, sd->Data, alloc)
SKIP_DATA(sd, numBytes)
return SZ_OK;
}
MY_ALLOC(Byte, *v, numBytes, alloc)
v2 = *v;
memset(v2, 0xFF, (size_t)numBytes);
{
const unsigned numBits = (unsigned)numItems & 7;
if (numBits != 0)
v2[(size_t)numBytes - 1] = (Byte)((((UInt32)1 << numBits) - 1) << (8 - numBits));
}
return SZ_OK;
}
static Z7_NO_INLINE SRes ReadUi32s(CSzData *sd2, UInt32 numItems, CSzBitUi32s *crcs, ISzAllocPtr alloc)
{
UInt32 i;
CSzData sd;
UInt32 *vals;
const Byte *defs;
MY_ALLOC_ZE(UInt32, crcs->Vals, numItems, alloc)
sd = *sd2;
defs = crcs->Defs;
vals = crcs->Vals;
for (i = 0; i < numItems; i++)
if (SzBitArray_Check(defs, i))
{
SZ_READ_32(vals[i])
}
else
vals[i] = 0;
*sd2 = sd;
return SZ_OK;
}
static SRes ReadBitUi32s(CSzData *sd, UInt32 numItems, CSzBitUi32s *crcs, ISzAllocPtr alloc)
{
SzBitUi32s_Free(crcs, alloc);
RINOK(ReadBitVector(sd, numItems, &crcs->Defs, alloc))
return ReadUi32s(sd, numItems, crcs, alloc);
}
static SRes SkipBitUi32s(CSzData *sd, UInt32 numItems)
{
Byte allAreDefined;
UInt32 numDefined = numItems;
SZ_READ_BYTE(allAreDefined)
if (!allAreDefined)
{
const size_t numBytes = (numItems + 7) >> 3;
if (numBytes > sd->Size)
return SZ_ERROR_ARCHIVE;
numDefined = CountDefinedBits(sd->Data, numItems);
SKIP_DATA(sd, numBytes)
}
if (numDefined > (sd->Size >> 2))
return SZ_ERROR_ARCHIVE;
SKIP_DATA(sd, (size_t)numDefined * 4)
return SZ_OK;
}
static SRes ReadPackInfo(CSzAr *p, CSzData *sd, ISzAllocPtr alloc)
{
RINOK(SzReadNumber32(sd, &p->NumPackStreams))
RINOK(WaitId(sd, k7zIdSize))
MY_ALLOC(UInt64, p->PackPositions, (size_t)p->NumPackStreams + 1, alloc)
{
UInt64 sum = 0;
UInt32 i;
const UInt32 numPackStreams = p->NumPackStreams;
for (i = 0; i < numPackStreams; i++)
{
UInt64 packSize;
p->PackPositions[i] = sum;
RINOK(ReadNumber(sd, &packSize))
sum += packSize;
if (sum < packSize)
return SZ_ERROR_ARCHIVE;
}
p->PackPositions[i] = sum;
}
for (;;)
{
UInt64 type;
RINOK(ReadID(sd, &type))
if (type == k7zIdEnd)
return SZ_OK;
if (type == k7zIdCRC)
{
/* CRC of packed streams is unused now */
RINOK(SkipBitUi32s(sd, p->NumPackStreams))
continue;
}
RINOK(SkipData(sd))
}
}
/*
static SRes SzReadSwitch(CSzData *sd)
{
Byte external;
RINOK(SzReadByte(sd, &external));
return (external == 0) ? SZ_OK: SZ_ERROR_UNSUPPORTED;
}
*/
#define k_NumCodersStreams_in_Folder_MAX (SZ_NUM_BONDS_IN_FOLDER_MAX + SZ_NUM_PACK_STREAMS_IN_FOLDER_MAX)
SRes SzGetNextFolderItem(CSzFolder *f, CSzData *sd)
{
UInt32 numCoders, i;
UInt32 numInStreams = 0;
const Byte *dataStart = sd->Data;
f->NumCoders = 0;
f->NumBonds = 0;
f->NumPackStreams = 0;
f->UnpackStream = 0;
RINOK(SzReadNumber32(sd, &numCoders))
if (numCoders == 0 || numCoders > SZ_NUM_CODERS_IN_FOLDER_MAX)
return SZ_ERROR_UNSUPPORTED;
for (i = 0; i < numCoders; i++)
{
Byte mainByte;
CSzCoderInfo *coder = f->Coders + i;
unsigned idSize, j;
UInt64 id;
SZ_READ_BYTE(mainByte)
if ((mainByte & 0xC0) != 0)
return SZ_ERROR_UNSUPPORTED;
idSize = (unsigned)(mainByte & 0xF);
if (idSize > sizeof(id))
return SZ_ERROR_UNSUPPORTED;
if (idSize > sd->Size)
return SZ_ERROR_ARCHIVE;
id = 0;
for (j = 0; j < idSize; j++)
{
id = ((id << 8) | *sd->Data);
sd->Data++;
sd->Size--;
}
if (id > (UInt32)0xFFFFFFFF)
return SZ_ERROR_UNSUPPORTED;
coder->MethodID = (UInt32)id;
coder->NumStreams = 1;
coder->PropsOffset = 0;
coder->PropsSize = 0;
if ((mainByte & 0x10) != 0)
{
UInt32 numStreams;
RINOK(SzReadNumber32(sd, &numStreams))
if (numStreams > k_NumCodersStreams_in_Folder_MAX)
return SZ_ERROR_UNSUPPORTED;
coder->NumStreams = (Byte)numStreams;
RINOK(SzReadNumber32(sd, &numStreams))
if (numStreams != 1)
return SZ_ERROR_UNSUPPORTED;
}
numInStreams += coder->NumStreams;
if (numInStreams > k_NumCodersStreams_in_Folder_MAX)
return SZ_ERROR_UNSUPPORTED;
if ((mainByte & 0x20) != 0)
{
UInt32 propsSize = 0;
RINOK(SzReadNumber32(sd, &propsSize))
if (propsSize > sd->Size)
return SZ_ERROR_ARCHIVE;
if (propsSize >= 0x80)
return SZ_ERROR_UNSUPPORTED;
coder->PropsOffset = (size_t)(sd->Data - dataStart);
coder->PropsSize = (Byte)propsSize;
sd->Data += (size_t)propsSize;
sd->Size -= (size_t)propsSize;
}
}
/*
if (numInStreams == 1 && numCoders == 1)
{
f->NumPackStreams = 1;
f->PackStreams[0] = 0;
}
else
*/
{
Byte streamUsed[k_NumCodersStreams_in_Folder_MAX];
UInt32 numBonds, numPackStreams;
numBonds = numCoders - 1;
if (numInStreams < numBonds)
return SZ_ERROR_ARCHIVE;
if (numBonds > SZ_NUM_BONDS_IN_FOLDER_MAX)
return SZ_ERROR_UNSUPPORTED;
f->NumBonds = numBonds;
numPackStreams = numInStreams - numBonds;
if (numPackStreams > SZ_NUM_PACK_STREAMS_IN_FOLDER_MAX)
return SZ_ERROR_UNSUPPORTED;
f->NumPackStreams = numPackStreams;
for (i = 0; i < numInStreams; i++)
streamUsed[i] = False;
if (numBonds != 0)
{
Byte coderUsed[SZ_NUM_CODERS_IN_FOLDER_MAX];
for (i = 0; i < numCoders; i++)
coderUsed[i] = False;
for (i = 0; i < numBonds; i++)
{
CSzBond *bp = f->Bonds + i;
RINOK(SzReadNumber32(sd, &bp->InIndex))
if (bp->InIndex >= numInStreams || streamUsed[bp->InIndex])
return SZ_ERROR_ARCHIVE;
streamUsed[bp->InIndex] = True;
RINOK(SzReadNumber32(sd, &bp->OutIndex))
if (bp->OutIndex >= numCoders || coderUsed[bp->OutIndex])
return SZ_ERROR_ARCHIVE;
coderUsed[bp->OutIndex] = True;
}
for (i = 0; i < numCoders; i++)
if (!coderUsed[i])
{
f->UnpackStream = i;
break;
}
if (i == numCoders)
return SZ_ERROR_ARCHIVE;
}
if (numPackStreams == 1)
{
for (i = 0; i < numInStreams; i++)
if (!streamUsed[i])
break;
if (i == numInStreams)
return SZ_ERROR_ARCHIVE;
f->PackStreams[0] = i;
}
else
for (i = 0; i < numPackStreams; i++)
{
UInt32 index;
RINOK(SzReadNumber32(sd, &index))
if (index >= numInStreams || streamUsed[index])
return SZ_ERROR_ARCHIVE;
streamUsed[index] = True;
f->PackStreams[i] = index;
}
}
f->NumCoders = numCoders;
return SZ_OK;
}
static Z7_NO_INLINE SRes SkipNumbers(CSzData *sd2, UInt32 num)
{
CSzData sd;
sd = *sd2;
for (; num != 0; num--)
{
Byte firstByte, mask;
unsigned i;
SZ_READ_BYTE_2(firstByte)
if ((firstByte & 0x80) == 0)
continue;
if ((firstByte & 0x40) == 0)
{
if (sd.Size == 0)
return SZ_ERROR_ARCHIVE;
sd.Size--;
sd.Data++;
continue;
}
mask = 0x20;
for (i = 2; i < 8 && (firstByte & mask) != 0; i++)
mask >>= 1;
if (i > sd.Size)
return SZ_ERROR_ARCHIVE;
SKIP_DATA2(sd, i)
}
*sd2 = sd;
return SZ_OK;
}
#define k_Scan_NumCoders_MAX 64
#define k_Scan_NumCodersStreams_in_Folder_MAX 64
static SRes ReadUnpackInfo(CSzAr *p,
CSzData *sd2,
UInt32 numFoldersMax,
const CBuf *tempBufs, UInt32 numTempBufs,
ISzAllocPtr alloc)
{
CSzData sd;
UInt32 fo, numFolders, numCodersOutStreams, packStreamIndex;
const Byte *startBufPtr;
Byte external;
RINOK(WaitId(sd2, k7zIdFolder))
RINOK(SzReadNumber32(sd2, &numFolders))
if (numFolders > numFoldersMax)
return SZ_ERROR_UNSUPPORTED;
p->NumFolders = numFolders;
SZ_READ_BYTE_SD(sd2, external)
if (external == 0)
sd = *sd2;
else
{
UInt32 index;
RINOK(SzReadNumber32(sd2, &index))
if (index >= numTempBufs)
return SZ_ERROR_ARCHIVE;
sd.Data = tempBufs[index].data;
sd.Size = tempBufs[index].size;
}
MY_ALLOC(size_t, p->FoCodersOffsets, (size_t)numFolders + 1, alloc)
MY_ALLOC(UInt32, p->FoStartPackStreamIndex, (size_t)numFolders + 1, alloc)
MY_ALLOC(UInt32, p->FoToCoderUnpackSizes, (size_t)numFolders + 1, alloc)
MY_ALLOC_ZE(Byte, p->FoToMainUnpackSizeIndex, (size_t)numFolders, alloc)
startBufPtr = sd.Data;
packStreamIndex = 0;
numCodersOutStreams = 0;
for (fo = 0; fo < numFolders; fo++)
{
UInt32 numCoders, ci, numInStreams = 0;
p->FoCodersOffsets[fo] = (size_t)(sd.Data - startBufPtr);
RINOK(SzReadNumber32(&sd, &numCoders))
if (numCoders == 0 || numCoders > k_Scan_NumCoders_MAX)
return SZ_ERROR_UNSUPPORTED;
for (ci = 0; ci < numCoders; ci++)
{
Byte mainByte;
unsigned idSize;
UInt32 coderInStreams;
SZ_READ_BYTE_2(mainByte)
if ((mainByte & 0xC0) != 0)
return SZ_ERROR_UNSUPPORTED;
idSize = (mainByte & 0xF);
if (idSize > 8)
return SZ_ERROR_UNSUPPORTED;
if (idSize > sd.Size)
return SZ_ERROR_ARCHIVE;
SKIP_DATA2(sd, idSize)
coderInStreams = 1;
if ((mainByte & 0x10) != 0)
{
UInt32 coderOutStreams;
RINOK(SzReadNumber32(&sd, &coderInStreams))
RINOK(SzReadNumber32(&sd, &coderOutStreams))
if (coderInStreams > k_Scan_NumCodersStreams_in_Folder_MAX || coderOutStreams != 1)
return SZ_ERROR_UNSUPPORTED;
}
numInStreams += coderInStreams;
if ((mainByte & 0x20) != 0)
{
UInt32 propsSize;
RINOK(SzReadNumber32(&sd, &propsSize))
if (propsSize > sd.Size)
return SZ_ERROR_ARCHIVE;
SKIP_DATA2(sd, propsSize)
}
}
{
UInt32 indexOfMainStream = 0;
UInt32 numPackStreams = 1;
if (numCoders != 1 || numInStreams != 1)
{
Byte streamUsed[k_Scan_NumCodersStreams_in_Folder_MAX];
Byte coderUsed[k_Scan_NumCoders_MAX];
UInt32 i;
const UInt32 numBonds = numCoders - 1;
if (numInStreams < numBonds)
return SZ_ERROR_ARCHIVE;
if (numInStreams > k_Scan_NumCodersStreams_in_Folder_MAX)
return SZ_ERROR_UNSUPPORTED;
for (i = 0; i < numInStreams; i++)
streamUsed[i] = False;
for (i = 0; i < numCoders; i++)
coderUsed[i] = False;
for (i = 0; i < numBonds; i++)
{
UInt32 index;
RINOK(SzReadNumber32(&sd, &index))
if (index >= numInStreams || streamUsed[index])
return SZ_ERROR_ARCHIVE;
streamUsed[index] = True;
RINOK(SzReadNumber32(&sd, &index))
if (index >= numCoders || coderUsed[index])
return SZ_ERROR_ARCHIVE;
coderUsed[index] = True;
}
numPackStreams = numInStreams - numBonds;
if (numPackStreams != 1)
for (i = 0; i < numPackStreams; i++)
{
UInt32 index;
RINOK(SzReadNumber32(&sd, &index))
if (index >= numInStreams || streamUsed[index])
return SZ_ERROR_ARCHIVE;
streamUsed[index] = True;
}
for (i = 0; i < numCoders; i++)
if (!coderUsed[i])
{
indexOfMainStream = i;
break;
}
if (i == numCoders)
return SZ_ERROR_ARCHIVE;
}
p->FoStartPackStreamIndex[fo] = packStreamIndex;
p->FoToCoderUnpackSizes[fo] = numCodersOutStreams;
p->FoToMainUnpackSizeIndex[fo] = (Byte)indexOfMainStream;
numCodersOutStreams += numCoders;
if (numCodersOutStreams < numCoders)
return SZ_ERROR_UNSUPPORTED;
if (numPackStreams > p->NumPackStreams - packStreamIndex)
return SZ_ERROR_ARCHIVE;
packStreamIndex += numPackStreams;
}
}
p->FoToCoderUnpackSizes[fo] = numCodersOutStreams;
{
const size_t dataSize = (size_t)(sd.Data - startBufPtr);
p->FoStartPackStreamIndex[fo] = packStreamIndex;
p->FoCodersOffsets[fo] = dataSize;
MY_ALLOC_ZE_AND_CPY(p->CodersData, dataSize, startBufPtr, alloc)
}
if (external != 0)
{
if (sd.Size != 0)
return SZ_ERROR_ARCHIVE;
sd = *sd2;
}
RINOK(WaitId(&sd, k7zIdCodersUnpackSize))
MY_ALLOC_ZE(UInt64, p->CoderUnpackSizes, (size_t)numCodersOutStreams, alloc)
{
UInt32 i;
for (i = 0; i < numCodersOutStreams; i++)
{
RINOK(ReadNumber(&sd, p->CoderUnpackSizes + i))
}
}
for (;;)
{
UInt64 type;
RINOK(ReadID(&sd, &type))
if (type == k7zIdEnd)
{
*sd2 = sd;
return SZ_OK;
}
if (type == k7zIdCRC)
{
RINOK(ReadBitUi32s(&sd, numFolders, &p->FolderCRCs, alloc))
continue;
}
RINOK(SkipData(&sd))
}
}
UInt64 SzAr_GetFolderUnpackSize(const CSzAr *p, UInt32 folderIndex)
{
return p->CoderUnpackSizes[p->FoToCoderUnpackSizes[folderIndex] + p->FoToMainUnpackSizeIndex[folderIndex]];
}
typedef struct
{
UInt32 NumTotalSubStreams;
UInt32 NumSubDigests;
CSzData sdNumSubStreams;
CSzData sdSizes;
CSzData sdCRCs;
} CSubStreamInfo;
static SRes ReadSubStreamsInfo(CSzAr *p, CSzData *sd, CSubStreamInfo *ssi)
{
UInt64 type = 0;
UInt32 numSubDigests = 0;
const UInt32 numFolders = p->NumFolders;
UInt32 numUnpackStreams = numFolders;
UInt32 numUnpackSizesInData = 0;
for (;;)
{
RINOK(ReadID(sd, &type))
if (type == k7zIdNumUnpackStream)
{
UInt32 i;
ssi->sdNumSubStreams.Data = sd->Data;
numUnpackStreams = 0;
numSubDigests = 0;
for (i = 0; i < numFolders; i++)
{
UInt32 numStreams;
RINOK(SzReadNumber32(sd, &numStreams))
if (numUnpackStreams > numUnpackStreams + numStreams)
return SZ_ERROR_UNSUPPORTED;
numUnpackStreams += numStreams;
if (numStreams != 0)
numUnpackSizesInData += (numStreams - 1);
if (numStreams != 1 || !SzBitWithVals_Check(&p->FolderCRCs, i))
numSubDigests += numStreams;
}
ssi->sdNumSubStreams.Size = (size_t)(sd->Data - ssi->sdNumSubStreams.Data);
continue;
}
if (type == k7zIdCRC || type == k7zIdSize || type == k7zIdEnd)
break;
RINOK(SkipData(sd))
}
if (!ssi->sdNumSubStreams.Data)
{
numSubDigests = numFolders;
if (p->FolderCRCs.Defs)
numSubDigests = numFolders - CountDefinedBits(p->FolderCRCs.Defs, numFolders);
}
ssi->NumTotalSubStreams = numUnpackStreams;
ssi->NumSubDigests = numSubDigests;
if (type == k7zIdSize)
{
ssi->sdSizes.Data = sd->Data;
RINOK(SkipNumbers(sd, numUnpackSizesInData))
ssi->sdSizes.Size = (size_t)(sd->Data - ssi->sdSizes.Data);
RINOK(ReadID(sd, &type))
}
for (;;)
{
if (type == k7zIdEnd)
return SZ_OK;
if (type == k7zIdCRC)
{
ssi->sdCRCs.Data = sd->Data;
RINOK(SkipBitUi32s(sd, numSubDigests))
ssi->sdCRCs.Size = (size_t)(sd->Data - ssi->sdCRCs.Data);
}
else
{
RINOK(SkipData(sd))
}
RINOK(ReadID(sd, &type))
}
}
static SRes SzReadStreamsInfo(CSzAr *p,
CSzData *sd,
UInt32 numFoldersMax, const CBuf *tempBufs, UInt32 numTempBufs,
UInt64 *dataOffset,
CSubStreamInfo *ssi,
ISzAllocPtr alloc)
{
UInt64 type;
SzData_CLEAR(&ssi->sdSizes)
SzData_CLEAR(&ssi->sdCRCs)
SzData_CLEAR(&ssi->sdNumSubStreams)
*dataOffset = 0;
RINOK(ReadID(sd, &type))
if (type == k7zIdPackInfo)
{
RINOK(ReadNumber(sd, dataOffset))
if (*dataOffset > p->RangeLimit)
return SZ_ERROR_ARCHIVE;
RINOK(ReadPackInfo(p, sd, alloc))
if (p->PackPositions[p->NumPackStreams] > p->RangeLimit - *dataOffset)
return SZ_ERROR_ARCHIVE;
RINOK(ReadID(sd, &type))
}
if (type == k7zIdUnpackInfo)
{
RINOK(ReadUnpackInfo(p, sd, numFoldersMax, tempBufs, numTempBufs, alloc))
RINOK(ReadID(sd, &type))
}
if (type == k7zIdSubStreamsInfo)
{
RINOK(ReadSubStreamsInfo(p, sd, ssi))
RINOK(ReadID(sd, &type))
}
else
{
ssi->NumTotalSubStreams = p->NumFolders;
// ssi->NumSubDigests = 0;
}
return (type == k7zIdEnd ? SZ_OK : SZ_ERROR_UNSUPPORTED);
}
static SRes SzReadAndDecodePackedStreams(
ILookInStreamPtr inStream,
CSzData *sd,
CBuf *tempBufs,
UInt32 numFoldersMax,
UInt64 baseOffset,
CSzAr *p,
ISzAllocPtr allocTemp)
{
UInt64 dataStartPos;
UInt32 fo;
CSubStreamInfo ssi;