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// Archive/ChmIn.h
#ifndef __ARCHIVE_CHM_IN_H
#define __ARCHIVE_CHM_IN_H
#include "Common/Buffer.h"
#include "Common/MyString.h"
#include "../../IStream.h"
#include "../../Common/InBuffer.h"
#include "ChmHeader.h"
namespace NArchive {
namespace NChm {
struct CItem
{
UInt64 Section;
UInt64 Offset;
UInt64 Size;
AString Name;
bool IsFormatRelatedItem() const
{
if (Name.Length() < 2)
return false;
return Name[0] == ':' && Name[1] == ':';
}
bool IsUserItem() const
{
if (Name.Length() < 2)
return false;
return Name[0] == '/';
}
bool IsDir() const
{
if (Name.Length() == 0)
return false;
return (Name[Name.Length() - 1] == '/');
}
};
struct CDatabase
{
UInt64 ContentOffset;
CObjectVector<CItem> Items;
AString NewFormatString;
bool Help2Format;
bool NewFormat;
int FindItem(const AString &name) const
{
for (int i = 0; i < Items.Size(); i++)
if (Items[i].Name == name)
return i;
return -1;
}
void Clear()
{
NewFormat = false;
NewFormatString.Empty();
Help2Format = false;
Items.Clear();
}
};
struct CResetTable
{
UInt64 UncompressedSize;
UInt64 CompressedSize;
UInt64 BlockSize;
CRecordVector<UInt64> ResetOffsets;
bool GetCompressedSizeOfBlocks(UInt64 blockIndex, UInt32 numBlocks, UInt64 &size) const
{
if (blockIndex >= ResetOffsets.Size())
return false;
UInt64 startPos = ResetOffsets[(int)blockIndex];
if (blockIndex + numBlocks >= ResetOffsets.Size())
size = CompressedSize - startPos;
else
size = ResetOffsets[(int)(blockIndex + numBlocks)] - startPos;
return true;
}
bool GetCompressedSizeOfBlock(UInt64 blockIndex, UInt64 &size) const
{
return GetCompressedSizeOfBlocks(blockIndex, 1, size);
}
UInt64 GetNumBlocks(UInt64 size) const
{
return (size + BlockSize - 1) / BlockSize;
}
};
struct CLzxInfo
{
UInt32 Version;
UInt32 ResetInterval;
UInt32 WindowSize;
UInt32 CacheSize;
CResetTable ResetTable;
UInt32 GetNumDictBits() const
{
if (Version == 2 || Version == 3)
{
for (int i = 0; i <= 31; i++)
if (((UInt32)1 << i) >= WindowSize)
return 15 + i;
}
return 0;
}
UInt64 GetFolderSize() const { return ResetTable.BlockSize * ResetInterval; };
UInt64 GetFolder(UInt64 offset) const { return offset / GetFolderSize(); };
UInt64 GetFolderPos(UInt64 folderIndex) const { return folderIndex * GetFolderSize(); };
UInt64 GetBlockIndexFromFolderIndex(UInt64 folderIndex) const { return folderIndex * ResetInterval; };
bool GetOffsetOfFolder(UInt64 folderIndex, UInt64 &offset) const
{
UInt64 blockIndex = GetBlockIndexFromFolderIndex(folderIndex);
if (blockIndex >= ResetTable.ResetOffsets.Size())
return false;
offset = ResetTable.ResetOffsets[(int)blockIndex];
return true;
}
bool GetCompressedSizeOfFolder(UInt64 folderIndex, UInt64 &size) const
{
UInt64 blockIndex = GetBlockIndexFromFolderIndex(folderIndex);
return ResetTable.GetCompressedSizeOfBlocks(blockIndex, ResetInterval, size);
}
};
struct CMethodInfo
{
GUID Guid;
CByteBuffer ControlData;
CLzxInfo LzxInfo;
bool IsLzx() const;
bool IsDes() const;
AString GetGuidString() const;
UString GetName() const;
};
struct CSectionInfo
{
UInt64 Offset;
UInt64 CompressedSize;
UInt64 UncompressedSize;
AString Name;
CObjectVector<CMethodInfo> Methods;
bool IsLzx() const;
UString GetMethodName() const;
};
class CFilesDatabase: public CDatabase
{
public:
bool LowLevel;
CRecordVector<int> Indices;
CObjectVector<CSectionInfo> Sections;
UInt64 GetFileSize(int fileIndex) const { return Items[Indices[fileIndex]].Size; }
UInt64 GetFileOffset(int fileIndex) const { return Items[Indices[fileIndex]].Offset; }
UInt64 GetFolder(int fileIndex) const
{
const CItem &item = Items[Indices[fileIndex]];
const CSectionInfo §ion = Sections[(int)item.Section];
if (section.IsLzx())
return section.Methods[0].LzxInfo.GetFolder(item.Offset);
return 0;
}
UInt64 GetLastFolder(int fileIndex) const
{
const CItem &item = Items[Indices[fileIndex]];
const CSectionInfo §ion = Sections[(int)item.Section];
if (section.IsLzx())
return section.Methods[0].LzxInfo.GetFolder(item.Offset + item.Size - 1);
return 0;
}
void HighLevelClear()
{
LowLevel = true;
Indices.Clear();
Sections.Clear();
}
void Clear()
{
CDatabase::Clear();
HighLevelClear();
}
void SetIndices();
void Sort();
bool Check();
};
class CProgressVirt
{
public:
STDMETHOD(SetTotal)(const UInt64 *numFiles) PURE;
STDMETHOD(SetCompleted)(const UInt64 *numFiles) PURE;
};
class CInArchive
{
UInt64 _startPosition;
::CInBuffer _inBuffer;
UInt64 _chunkSize;
Byte ReadByte();
void ReadBytes(Byte *data, UInt32 size);
void Skip(size_t size);
UInt16 ReadUInt16();
UInt32 ReadUInt32();
UInt64 ReadUInt64();
UInt64 ReadEncInt();
void ReadString(int size, AString &s);
void ReadUString(int size, UString &s);
void ReadGUID(GUID &g);
HRESULT ReadChunk(IInStream *inStream, UInt64 pos, UInt64 size);
HRESULT ReadDirEntry(CDatabase &database);
HRESULT DecompressStream(IInStream *inStream, const CDatabase &database, const AString &name);
public:
HRESULT OpenChm(IInStream *inStream, CDatabase &database);
HRESULT OpenHelp2(IInStream *inStream, CDatabase &database);
HRESULT OpenHighLevel(IInStream *inStream, CFilesDatabase &database);
HRESULT Open2(IInStream *inStream, const UInt64 *searchHeaderSizeLimit, CFilesDatabase &database);
HRESULT Open(IInStream *inStream, const UInt64 *searchHeaderSizeLimit, CFilesDatabase &database);
};
}}
#endif
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