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// Archive/CabIn.cpp
#include "StdAfx.h"
#include "../Common/FindSignature.h"
#include "CabIn.h"
namespace NArchive {
namespace NCab {
Byte CInArchive::Read8()
{
Byte b;
if (!inBuffer.ReadByte(b))
throw CInArchiveException(CInArchiveException::kUnsupported);
return b;
}
UInt16 CInArchive::Read16()
{
UInt16 value = 0;
for (int i = 0; i < 2; i++)
{
Byte b = Read8();
value |= (UInt16(b) << (8 * i));
}
return value;
}
UInt32 CInArchive::Read32()
{
UInt32 value = 0;
for (int i = 0; i < 4; i++)
{
Byte b = Read8();
value |= (UInt32(b) << (8 * i));
}
return value;
}
AString CInArchive::SafeReadName()
{
AString name;
for (;;)
{
Byte b = Read8();
if (b == 0)
return name;
name += (char)b;
}
}
void CInArchive::ReadOtherArchive(COtherArchive &oa)
{
oa.FileName = SafeReadName();
oa.DiskName = SafeReadName();
}
void CInArchive::Skip(UInt32 size)
{
while (size-- != 0)
Read8();
}
HRESULT CInArchive::Open(const UInt64 *searchHeaderSizeLimit, CDatabaseEx &db)
{
IInStream *stream = db.Stream;
db.Clear();
RINOK(stream->Seek(0, STREAM_SEEK_SET, &db.StartPosition));
RINOK(FindSignatureInStream(stream, NHeader::kMarker, NHeader::kMarkerSize,
searchHeaderSizeLimit, db.StartPosition));
RINOK(stream->Seek(db.StartPosition + NHeader::kMarkerSize, STREAM_SEEK_SET, NULL));
if (!inBuffer.Create(1 << 17))
return E_OUTOFMEMORY;
inBuffer.SetStream(stream);
inBuffer.Init();
CInArchiveInfo &ai = db.ArchiveInfo;
ai.Size = Read32();
if (Read32() != 0)
return S_FALSE;
ai.FileHeadersOffset = Read32();
if (Read32() != 0)
return S_FALSE;
ai.VersionMinor = Read8();
ai.VersionMajor = Read8();
ai.NumFolders = Read16();
ai.NumFiles = Read16();
ai.Flags = Read16();
if (ai.Flags > 7)
return S_FALSE;
ai.SetID = Read16();
ai.CabinetNumber = Read16();
if (ai.ReserveBlockPresent())
{
ai.PerCabinetAreaSize = Read16();
ai.PerFolderAreaSize = Read8();
ai.PerDataBlockAreaSize = Read8();
Skip(ai.PerCabinetAreaSize);
}
{
if (ai.IsTherePrev())
ReadOtherArchive(ai.PrevArc);
if (ai.IsThereNext())
ReadOtherArchive(ai.NextArc);
}
int i;
for (i = 0; i < ai.NumFolders; i++)
{
CFolder folder;
folder.DataStart = Read32();
folder.NumDataBlocks = Read16();
folder.CompressionTypeMajor = Read8();
folder.CompressionTypeMinor = Read8();
Skip(ai.PerFolderAreaSize);
db.Folders.Add(folder);
}
RINOK(stream->Seek(db.StartPosition + ai.FileHeadersOffset, STREAM_SEEK_SET, NULL));
inBuffer.SetStream(stream);
inBuffer.Init();
for (i = 0; i < ai.NumFiles; i++)
{
CItem item;
item.Size = Read32();
item.Offset = Read32();
item.FolderIndex = Read16();
UInt16 pureDate = Read16();
UInt16 pureTime = Read16();
item.Time = ((UInt32(pureDate) << 16)) | pureTime;
item.Attributes = Read16();
item.Name = SafeReadName();
int folderIndex = item.GetFolderIndex(db.Folders.Size());
if (folderIndex >= db.Folders.Size())
return S_FALSE;
db.Items.Add(item);
}
return S_OK;
}
#define RINOZ(x) { int __tt = (x); if (__tt != 0) return __tt; }
static int CompareMvItems(const CMvItem *p1, const CMvItem *p2, void *param)
{
const CMvDatabaseEx &mvDb = *(const CMvDatabaseEx *)param;
const CDatabaseEx &db1 = mvDb.Volumes[p1->VolumeIndex];
const CDatabaseEx &db2 = mvDb.Volumes[p2->VolumeIndex];
const CItem &item1 = db1.Items[p1->ItemIndex];
const CItem &item2 = db2.Items[p2->ItemIndex];;
bool isDir1 = item1.IsDir();
bool isDir2 = item2.IsDir();
if (isDir1 && !isDir2)
return -1;
if (isDir2 && !isDir1)
return 1;
int f1 = mvDb.GetFolderIndex(p1);
int f2 = mvDb.GetFolderIndex(p2);
RINOZ(MyCompare(f1, f2));
RINOZ(MyCompare(item1.Offset, item2.Offset));
RINOZ(MyCompare(item1.Size, item2.Size));
RINOZ(MyCompare(p1->VolumeIndex, p2->VolumeIndex));
return MyCompare(p1->ItemIndex, p2->ItemIndex);
}
bool CMvDatabaseEx::AreItemsEqual(int i1, int i2)
{
const CMvItem *p1 = &Items[i1];
const CMvItem *p2 = &Items[i2];
const CDatabaseEx &db1 = Volumes[p1->VolumeIndex];
const CDatabaseEx &db2 = Volumes[p2->VolumeIndex];
const CItem &item1 = db1.Items[p1->ItemIndex];
const CItem &item2 = db2.Items[p2->ItemIndex];;
return GetFolderIndex(p1) == GetFolderIndex(p2) &&
item1.Offset == item2.Offset &&
item1.Size == item2.Size &&
item1.Name == item2.Name;
}
void CMvDatabaseEx::FillSortAndShrink()
{
Items.Clear();
StartFolderOfVol.Clear();
FolderStartFileIndex.Clear();
int offset = 0;
for (int v = 0; v < Volumes.Size(); v++)
{
const CDatabaseEx &db = Volumes[v];
int curOffset = offset;
if (db.IsTherePrevFolder())
curOffset--;
StartFolderOfVol.Add(curOffset);
offset += db.GetNumberOfNewFolders();
CMvItem mvItem;
mvItem.VolumeIndex = v;
for (int i = 0 ; i < db.Items.Size(); i++)
{
mvItem.ItemIndex = i;
Items.Add(mvItem);
}
}
Items.Sort(CompareMvItems, (void *)this);
int j = 1;
int i;
for (i = 1; i < Items.Size(); i++)
if (!AreItemsEqual(i, i -1))
Items[j++] = Items[i];
Items.DeleteFrom(j);
for (i = 0; i < Items.Size(); i++)
{
int folderIndex = GetFolderIndex(&Items[i]);
if (folderIndex >= FolderStartFileIndex.Size())
FolderStartFileIndex.Add(i);
}
}
bool CMvDatabaseEx::Check()
{
for (int v = 1; v < Volumes.Size(); v++)
{
const CDatabaseEx &db1 = Volumes[v];
if (db1.IsTherePrevFolder())
{
const CDatabaseEx &db0 = Volumes[v - 1];
if (db0.Folders.IsEmpty() || db1.Folders.IsEmpty())
return false;
const CFolder &f0 = db0.Folders.Back();
const CFolder &f1 = db1.Folders.Front();
if (f0.CompressionTypeMajor != f1.CompressionTypeMajor ||
f0.CompressionTypeMinor != f1.CompressionTypeMinor)
return false;
}
}
UInt32 beginPos = 0;
UInt64 endPos = 0;
int prevFolder = -2;
for (int i = 0; i < Items.Size(); i++)
{
const CMvItem &mvItem = Items[i];
int fIndex = GetFolderIndex(&mvItem);
if (fIndex >= FolderStartFileIndex.Size())
return false;
const CItem &item = Volumes[mvItem.VolumeIndex].Items[mvItem.ItemIndex];
if (item.IsDir())
continue;
int folderIndex = GetFolderIndex(&mvItem);
if (folderIndex != prevFolder)
prevFolder = folderIndex;
else if (item.Offset < endPos &&
(item.Offset != beginPos || item.GetEndOffset() != endPos))
return false;
beginPos = item.Offset;
endPos = item.GetEndOffset();
}
return true;
}
}}
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