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/*
* The ManaPlus Client
* Copyright (C) 2017 The ManaPlus Developers
*
* This file is part of The ManaPlus Client.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "fs/zip.h"
#include "fs/virtzipentry.h"
#include "fs/ziplocalheader.h"
#include "utils/checkutils.h"
#include "utils/stringutils.h"
#include <iostream>
#include <unistd.h>
#include <zlib.h>
#include "debug.h"
#define readVal(val, sz, msg) \
cnt = fread(static_cast<void*>(val), 1, sz, arcFile); \
if (cnt != sz) \
{ \
reportAlways("Error reading " msg " in file %s", \
archiveName.c_str()); \
delete header; \
delete [] buf; \
fclose(arcFile); \
return false; \
} \
namespace Zip
{
bool readArchiveInfo(VirtZipEntry *const entry)
{
if (entry == nullptr)
{
reportAlways("Entry is null.");
return false;
}
const std::string archiveName = entry->mArchiveName;
std::vector<ZipLocalHeader*> &restrict headers = entry->mHeaders;
std::vector<std::string> &restrict dirs = entry->mDirs;
FILE *restrict const arcFile = fopen(archiveName.c_str(),
"r");
if (arcFile == nullptr)
{
reportAlways("Can't open zip file %s",
archiveName.c_str());
return false;
}
size_t cnt = 0U;
uint8_t *const buf = new uint8_t[65535 + 10];
uint16_t val16 = 0U;
uint16_t method = 0U;
ZipLocalHeader *header = nullptr;
logger->log("Read archive: %s", archiveName.c_str());
// format source https://en.wikipedia.org/wiki/Zip_%28file_format%29
while (feof(arcFile) == 0)
{
// file header pointer on 0
// read file header signature
readVal(buf, 4, "zip file header"); // + 4
// pointer on 4
if (buf[0] == 0x50 &&
buf[1] == 0x4B &&
buf[2] == 0x03 &&
buf[3] == 0x04)
{ // local file header
header = new ZipLocalHeader;
header->zipEntry = entry;
// skip useless fields
fseek(arcFile, 4, SEEK_CUR); // + 4
// file header pointer on 8
// +++ need add endian specific decoding for method
readVal(&method, 2, "compression method") // + 2
header->compressed = (method != 0);
// file header pointer on 10
fseek(arcFile, 8, SEEK_CUR); // + 8
// file header pointer on 18
readVal(&header->compressSize, 4,
"zip compressed size") // + 4
// file header pointer on 22
// +++ need add endian specific decoding for val32
readVal(&header->uncompressSize, 4,
"zip uncompressed size") // + 4
// file header pointer on 26
// +++ need add endian specific decoding for val32
readVal(&val16, 2, "file name length") // + 2
// file header pointer on 28
const uint32_t fileNameLen = CAST_U32(val16);
if (fileNameLen > 1000)
{
reportAlways("Error too long file name in file %s",
archiveName.c_str());
delete header;
delete [] buf;
fclose(arcFile);
return false;
}
readVal(&val16, 2, "extra field length") // + 2
// file header pointer on 30
const uint32_t extraFieldLen = CAST_U32(val16);
readVal(buf, fileNameLen, "file name");
// file header pointer on 30 + fileNameLen
buf[fileNameLen] = 0;
header->fileName = std::string(
reinterpret_cast<char*>(buf));
header->dataOffset = ftell(arcFile) + extraFieldLen;
fseek(arcFile, extraFieldLen + header->compressSize, SEEK_CUR);
// pointer on 30 + fileNameLen + extraFieldLen + compressSize
if (findLast(header->fileName, "/") == false)
{
headers.push_back(header);
logger->log(" file name: %s",
header->fileName.c_str());
logger->log(" compression method: %u",
CAST_U32(method));
logger->log(" compressed size: %u",
header->compressSize);
logger->log(" uncompressed size: %u",
header->uncompressSize);
}
else
{
dirs.push_back(header->fileName);
delete header;
}
}
else if (buf[0] == 0x50 &&
buf[1] == 0x4B &&
buf[2] == 0x01 &&
buf[3] == 0x02)
{ // central directory file header
// !!! This is quick way for read zip archives. !!!
// !!! It ignore modified files in archive. !!!
// ignoring central directory entries
break;
}
else if (buf[0] == 0x50 &&
buf[1] == 0x4B &&
buf[2] == 0x05 &&
buf[3] == 0x06)
{ // end of central directory
// !!! This is quick way for read zip archives. !!!
// !!! It ignore modified files in archive. !!!
// ignoring end of central directory
break;
}
else
{
reportAlways("Error in header signature (0x%02x%02x%02x%02x)"
" in file %s",
buf[0],
buf[1],
buf[2],
buf[3],
archiveName.c_str());
delete [] buf;
fclose(arcFile);
return false;
}
}
delete [] buf;
fclose(arcFile);
return true;
}
void reportZlibError(const std::string &text,
const int err)
{
reportAlways("Zlib error: '%s' in %s",
text.c_str(),
getZlibError(err).c_str());
}
std::string getZlibError(const int err)
{
switch (err)
{
case Z_OK:
return std::string();
default:
return "unknown zlib error";
}
}
uint8_t *readCompressedFile(const ZipLocalHeader *restrict const header)
{
if (header == nullptr)
{
reportAlways("Zip::readCompressedFile: header is null");
return nullptr;
}
FILE *restrict const arcFile = fopen(
header->zipEntry->mArchiveName.c_str(),
"r");
if (arcFile == nullptr)
{
reportAlways("Can't open zip file %s",
header->zipEntry->mArchiveName.c_str());
return nullptr;
}
fseek(arcFile, header->dataOffset, SEEK_SET);
const uint32_t compressSize = header->compressSize;
uint8_t *const buf = new uint8_t[compressSize];
if (fread(static_cast<void*>(buf), 1, compressSize, arcFile) !=
compressSize)
{
reportAlways("Read zip compressed file error from archive: %s",
header->zipEntry->mArchiveName.c_str());
fclose(arcFile);
delete [] buf;
return nullptr;
}
fclose(arcFile);
return buf;
}
uint8_t *readFile(const ZipLocalHeader *restrict const header)
{
if (header == nullptr)
{
reportAlways("Open zip file error. header is null.");
return nullptr;
}
uint8_t *restrict const in = readCompressedFile(header);
if (in == nullptr)
return nullptr;
if (header->compressed == false)
return in; // return as is if data not compressed
const size_t outSize = header->uncompressSize;
uint8_t *restrict const out = new uint8_t[outSize];
if (outSize == 0)
return out;
z_stream strm;
strm.zalloc = nullptr;
strm.zfree = nullptr;
strm.opaque = nullptr;
strm.next_in = in;
strm.avail_in = header->compressSize;
strm.next_out = out;
strm.avail_out = outSize;
int ret = inflateInit2(&strm, -MAX_WBITS);
if (ret != Z_OK)
{
reportZlibError(header->zipEntry->mArchiveName, ret);
delete [] in;
delete [] out;
return nullptr;
}
ret = inflate(&strm, Z_FINISH);
// ret = inflate(&strm, Z_SYNC_FLUSH);
if (ret != Z_OK &&
ret != Z_STREAM_END)
{
reportZlibError("file decompression error",
ret);
inflateEnd(&strm);
delete [] in;
delete [] out;
return nullptr;
}
inflateEnd(&strm);
delete [] in;
return out;
}
} // namespace Zip
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