1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276
|
/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "SevenZipArchive.h"
#include <algorithm>
#include <stdexcept>
#include <string.h> //memcpy
extern "C" {
#include "lib/7z/Types.h"
#include "lib/7z/7zAlloc.h"
#include "lib/7z/7zCrc.h"
}
#include "System/CRC.h"
#include "System/StringUtil.h"
#include "System/Log/ILog.h"
static Byte kUtf8Limits[5] = { 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
static Bool Utf16_To_Utf8(char* dest, size_t* destLen, const UInt16* src, size_t srcLen)
{
size_t destPos = 0;
size_t srcPos = 0;
for (;;) {
unsigned numAdds;
UInt32 value;
if (srcPos == srcLen) {
*destLen = destPos;
return True;
}
if ((value = src[srcPos++]) < 0x80) {
dest[destPos++] = (char)value;
continue;
}
if (value >= 0xD800 && value < 0xE000) {
if (value >= 0xDC00 || srcPos == srcLen)
break;
const UInt32 c2 = src[srcPos++];
if (c2 < 0xDC00 || c2 >= 0xE000)
break;
value = (((value - 0xD800) << 10) | (c2 - 0xDC00)) + 0x10000;
}
for (numAdds = 1; numAdds < 5; numAdds++)
if (value < (((UInt32)1) << (numAdds * 5 + 6)))
break;
dest[destPos++] = (char)(kUtf8Limits[numAdds - 1] + (value >> (6 * numAdds)));
do {
numAdds--;
dest[destPos++] = (char)(0x80 + ((value >> (6 * numAdds)) & 0x3F));
} while (numAdds != 0);
}
*destLen = destPos;
return False;
}
int CSevenZipArchive::GetFileName(const CSzArEx* db, int i)
{
// caller has archiveLock
const size_t len = SzArEx_GetFileNameUtf16(db, i, nullptr);
if (len >= sizeof(tempBuffer))
return -1;
tempBuffer[len - 1] = 0;
return SzArEx_GetFileNameUtf16(db, i, tempBuffer);
}
IArchive* CSevenZipArchiveFactory::DoCreateArchive(const std::string& filePath) const
{
return new CSevenZipArchive(filePath);
}
static inline const char* GetErrorStr(int err)
{
switch (err) {
case SZ_OK:
return "OK";
case SZ_ERROR_FAIL:
return "Extracting failed";
case SZ_ERROR_CRC:
return "CRC error (archive corrupted?)";
case SZ_ERROR_INPUT_EOF:
return "Unexpected end of file (truncated?)";
case SZ_ERROR_MEM:
return "Out of memory";
case SZ_ERROR_UNSUPPORTED:
return "Unsupported archive";
case SZ_ERROR_NO_ARCHIVE:
return "Archive not found";
}
return "Unknown error";
}
static inline const char* GetSystemErrorStr(WRes wres)
{
static char buf[16384];
memset(buf, 0, sizeof(buf));
strncpy(buf, strerror(wres), sizeof(buf) - 1);
#ifdef USE_WINDOWS_FILE
LPSTR messageBuffer = nullptr;
size_t size = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr, wres, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR) &messageBuffer, 0, nullptr);
memset(buf, 0, sizeof(buf));
memcpy(buf, messageBuffer, std::min(sizeof(buf), strlen(static_cast<char*>(messageBuffer))));
LocalFree(messageBuffer);
#endif
return buf;
}
CSevenZipArchive::CSevenZipArchive(const std::string& name): CBufferedArchive(name, false)
{
std::lock_guard<spring::mutex> lck(archiveLock);
allocImp.Alloc = SzAlloc;
allocImp.Free = SzFree;
allocTempImp.Alloc = SzAllocTemp;
allocTempImp.Free = SzFreeTemp;
SzArEx_Init(&db);
const WRes wres = InFile_Open(&archiveStream.file, name.c_str());
if (wres) {
LOG_L(L_ERROR, "[%s] error opening \"%s\": %s (%i)", __func__, name.c_str(), GetSystemErrorStr(wres), (int) wres);
return;
}
FileInStream_CreateVTable(&archiveStream);
LookToRead_CreateVTable(&lookStream, False);
lookStream.realStream = &archiveStream.s;
LookToRead_Init(&lookStream);
CRC::InitTable();
const SRes res = SzArEx_Open(&db, &lookStream.s, &allocImp, &allocTempImp);
if (!(isOpen = (res == SZ_OK))) {
LOG_L(L_ERROR, "[%s] error opening \"%s\": %s", __func__, name.c_str(), GetErrorStr(res));
return;
}
// in 7zip, "folders" are pack-units (solid blocks)
// which have no relation to file-system folders
std::array<UInt64, 16384> folderUnpackSizesArr;
std::vector<UInt64> folderUnpackSizesVec;
UInt64* folderUnpackSizesPtr = nullptr;
if (db.db.NumFolders > folderUnpackSizesArr.size()) {
folderUnpackSizesVec.resize(db.db.NumFolders);
folderUnpackSizesPtr = folderUnpackSizesVec.data();
} else {
folderUnpackSizesPtr = folderUnpackSizesArr.data();
}
for (unsigned int fi = 0; fi < db.db.NumFolders; fi++) {
folderUnpackSizesPtr[fi] = SzFolder_GetUnpackSize(db.db.Folders + fi);
}
fileEntries.reserve(db.db.NumFiles);
// Get contents of archive and store name->int mapping
for (unsigned int i = 0; i < db.db.NumFiles; ++i) {
const CSzFileItem* f = db.db.Files + i;
if (f->IsDir)
continue;
const int written = GetFileName(&db, i);
if (written <= 0) {
LOG_L(L_ERROR, "[%s] error getting filename in Archive: %s (%d), file skipped in %s", __func__, GetErrorStr(res), res, name.c_str());
continue;
}
char buf[1024];
size_t dstlen = sizeof(buf);
Utf16_To_Utf8(buf, &dstlen, tempBuffer, written);
FileEntry fd;
fd.origName = buf;
fd.fp = i;
fd.size = f->Size;
fd.crc = (f->Size > 0) ? f->Crc: 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 = folderUnpackSizesPtr[folderIndex];
fd.packedSize = db.db.PackSizes[folderIndex];
}
lcNameIndex.emplace(StringToLower(fd.origName), fileEntries.size());
fileEntries.emplace_back(std::move(fd));
}
}
CSevenZipArchive::~CSevenZipArchive()
{
std::lock_guard<spring::mutex> lck(archiveLock);
if (outBuffer != nullptr)
IAlloc_Free(&allocImp, outBuffer);
if (isOpen)
File_Close(&archiveStream.file);
SzArEx_Free(&db, &allocImp);
}
int CSevenZipArchive::GetFileImpl(unsigned int fid, std::vector<std::uint8_t>& buffer)
{
// assert(archiveLock.locked());
assert(IsFileId(fid));
size_t offset = 0;
size_t outSizeProcessed = 0;
if (SzArEx_Extract(&db, &lookStream.s, fileEntries[fid].fp, &blockIndex, &outBuffer, &outBufferSize, &offset, &outSizeProcessed, &allocImp, &allocTempImp) != SZ_OK)
return 0;
buffer.resize(outSizeProcessed);
memcpy(buffer.data(), reinterpret_cast<char*>(outBuffer) + offset, outSizeProcessed);
return 1;
}
void CSevenZipArchive::FileInfo(unsigned int fid, std::string& name, int& size) const
{
assert(IsFileId(fid));
name = fileEntries[fid].origName;
size = fileEntries[fid].size;
}
bool CSevenZipArchive::HasLowReadingCost(unsigned int fid) const
{
assert(IsFileId(fid));
const FileEntry& fd = fileEntries[fid];
// consider the cost of reading a file "high" if
// 1) the to-be-unpacked data is >= 32KB larger than it
// 2) the to-be-read-from-disk data is larger than 32KB
// this should work well for
// 1) small meta-files in small solid blocks
// 2) big files in separate solid blocks
// 3) non-solid archives
return (((fd.unpackedSize - fd.size) <= COST_LIMIT_UNPACK_OVERSIZE) || (fd.packedSize <= COST_LIMIT_DISK_READ));
}
|