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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "SevenZipArchive.h"
#include <algorithm>
#include <boost/system/error_code.hpp>
#include <stdexcept>
#include <string.h> //memcpy
extern "C" {
#include "lib/7z/Types.h"
#include "lib/7z/Archive/7z/7zAlloc.h"
#include "lib/7z/Archive/7z/7zExtract.h"
#include "lib/7z/7zCrc.h"
}
#include "System/Util.h"
#include "System/mmgr.h"
#include "System/Log/ILog.h"
CSevenZipArchiveFactory::CSevenZipArchiveFactory()
: IArchiveFactory("sd7")
{
}
IArchive* CSevenZipArchiveFactory::DoCreateArchive(const std::string& filePath) const
{
return new CSevenZipArchive(filePath);
}
CSevenZipArchive::CSevenZipArchive(const std::string& name) :
IArchive(name),
isOpen(false)
{
blockIndex = 0xFFFFFFFF;
outBuffer = NULL;
outBufferSize = 0;
allocImp.Alloc = SzAlloc;
allocImp.Free = SzFree;
allocTempImp.Alloc = SzAllocTemp;
allocTempImp.Free = SzFreeTemp;
SzArEx_Init(&db);
WRes wres = InFile_Open(&archiveStream.file, name.c_str());
if (wres) {
boost::system::error_code e(wres, boost::system::get_system_category());
LOG_L(L_ERROR, "Error opening %s: %s (%i)",
name.c_str(), e.message().c_str(), e.value());
return;
}
FileInStream_CreateVTable(&archiveStream);
LookToRead_CreateVTable(&lookStream, False);
lookStream.realStream = &archiveStream.s;
LookToRead_Init(&lookStream);
CrcGenerateTable();
SRes res = SzArEx_Open(&db, &lookStream.s, &allocImp, &allocTempImp);
if (res == SZ_OK) {
isOpen = true;
} else {
isOpen = false;
std::string error;
switch (res) {
case SZ_ERROR_FAIL:
error = "Extracting failed";
break;
case SZ_ERROR_CRC:
error = "CRC error (archive corrupted?)";
break;
case SZ_ERROR_INPUT_EOF:
error = "Unexpected end of file (truncated?)";
break;
case SZ_ERROR_MEM:
error = "Out of memory";
break;
case SZ_ERROR_UNSUPPORTED:
error = "Unsupported archive";
break;
case SZ_ERROR_NO_ARCHIVE:
error = "Archive not found";
break;
default:
error = "Unknown error";
break;
}
LOG_L(L_ERROR, "Error opening %s: %s", name.c_str(), error.c_str());
return;
}
// In 7zip talk, folders are pack-units (solid blocks),
// not related to file-system folders.
UInt64* folderUnpackSizes = new UInt64[db.db.NumFolders];
for (int fi = 0; fi < db.db.NumFolders; fi++) {
folderUnpackSizes[fi] = SzFolder_GetUnpackSize(db.db.Folders + fi);
}
// Get contents of archive and store name->int mapping
for (unsigned int i = 0; i < db.db.NumFiles; ++i) {
CSzFileItem* f = db.db.Files + i;
if ((f->Size >= 0) && !f->IsDir) {
std::string fileName = f->Name;
FileData fd;
fd.origName = fileName;
fd.fp = i;
fd.size = f->Size;
fd.crc = (f->Size > 0) ? f->FileCRC : 0;
const UInt32 folderIndex = db.FileIndexToFolderIndexMap[i];
if (folderIndex == ((UInt32)-1)) {
// file has no folder assigned
fd.unpackedSize = f->Size;
fd.packedSize = f->Size;
} else {
fd.unpackedSize = folderUnpackSizes[folderIndex];
fd.packedSize = db.db.PackSizes[folderIndex];
}
StringToLowerInPlace(fileName);
fileData.push_back(fd);
lcNameIndex[fileName] = fileData.size()-1;
}
}
delete [] folderUnpackSizes;
}
CSevenZipArchive::~CSevenZipArchive()
{
if (outBuffer) {
IAlloc_Free(&allocImp, outBuffer);
}
if (isOpen) {
File_Close(&archiveStream.file);
}
SzArEx_Free(&db, &allocImp);
}
bool CSevenZipArchive::IsOpen()
{
return isOpen;
}
unsigned int CSevenZipArchive::NumFiles() const
{
return fileData.size();
}
bool CSevenZipArchive::GetFile(unsigned int fid, std::vector<boost::uint8_t>& buffer)
{
boost::mutex::scoped_lock lck(archiveLock);
assert(IsFileId(fid));
// Get 7zip to decompress it
size_t offset;
size_t outSizeProcessed;
SRes res;
res = SzAr_Extract(&db, &lookStream.s, fileData[fid].fp, &blockIndex, &outBuffer, &outBufferSize, &offset, &outSizeProcessed, &allocImp, &allocTempImp);
if (res == SZ_OK) {
buffer.resize(outSizeProcessed);
memcpy(&buffer[0], (char*)outBuffer+offset, outSizeProcessed);
return true;
} else {
return false;
}
}
void CSevenZipArchive::FileInfo(unsigned int fid, std::string& name, int& size) const
{
assert(IsFileId(fid));
name = fileData[fid].origName;
size = fileData[fid].size;
}
const size_t CSevenZipArchive::COST_LIMIT_UNPACK_OVERSIZE = 32 * 1024;
const size_t CSevenZipArchive::COST_LIMIT_DISC_READ = 32 * 1024;
bool CSevenZipArchive::HasLowReadingCost(unsigned int fid) const
{
assert(IsFileId(fid));
const FileData& fd = fileData[fid];
// The cost is high, if the to-be-unpacked data is
// more then 32KB larger then the file alone,
// and the to-be-read-from-disc data is larger then 32KB.
// This should work well for:
// * small meta-files in small solid blocks
// * big ones in separate solid blocks
// * for non-solid archives anyway
return (((fd.unpackedSize - fd.size) <= COST_LIMIT_UNPACK_OVERSIZE)
|| (fd.packedSize <= COST_LIMIT_DISC_READ));
}
unsigned int CSevenZipArchive::GetCrc32(unsigned int fid)
{
assert(IsFileId(fid));
return fileData[fid].crc;
}
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