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/* This file is part of Strigi Desktop Search
*
* Copyright (C) 2006 Jos van den Oever <jos@vandenoever.info>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <strigi/rpminputstream.h>
#include <strigi/cpioinputstream.h>
#include <strigi/gzipinputstream.h>
#include <strigi/lzmainputstream.h>
#include <strigi/bz2inputstream.h>
#include <strigi/subinputstream.h>
#include <strigi/textutils.h>
#include <list>
using namespace std;
using namespace Strigi;
class RpmInputStream::RpmHeaderInfo {
};
/**
* RPM files as specified here:
* http://www.freestandards.org/spec/refspecs/LSB_1.3.0/gLSB/gLSB/swinstall.html
* and here:
* http://www.rpm.org/max-rpm-snapshot/s1-rpm-file-format-rpm-file-format.html
**/
bool
RpmInputStream::checkHeader(const char* data, int32_t datasize) {
static const char unsigned magic[] = {0xed,0xab,0xee,0xdb,0x03,0x00};
if (datasize < 6) return false;
// this check could be more strict
bool ok = memcmp(data, magic, 6) == 0;
return ok;
}
RpmInputStream::RpmInputStream(InputStream* input)
: SubStreamProvider(input), headerinfo(0) {
uncompressionStream = NULL;
cpio = 0;
m_status = Error;
// skip the header
const char* b;
// lead:96 bytes
if (m_input->read(b, 96, 96) != 96) {
m_error = "File is too small to be an RPM file.";
return;
}
// read signature
const unsigned char headmagic[] = {0x8e,0xad,0xe8,0x01};
if (m_input->read(b, 16, 16) != 16 || memcmp(b, headmagic, 4)!=0) {
m_error = "m_error in signature\n";
return;
}
int32_t nindex = readBigEndianInt32(b+8);
int32_t hsize = readBigEndianInt32(b+12);
int32_t sz = nindex*16+hsize;
if (sz%8) {
sz+=8-sz%8;
}
if (m_input->read(b, sz, sz) != sz) {
m_error = "RPM seems to be truncated or corrupted.";
return;
}
// read header
if (m_input->read(b, 16, 16) != 16 || memcmp(b, headmagic, 4)!=0) {
m_error = "m_error in header\n";
return;
}
nindex = readBigEndianInt32(b+8);
hsize = readBigEndianInt32(b+12);
int32_t size = nindex*16+hsize;
if (m_input->read(b, size, size) != size) {
m_error = "could not read header\n";
return;
}
for (int32_t i=0; i<nindex; ++i) {
const unsigned char* e = (const unsigned char*)b+i*16;
/*int32_t tag =*/ readBigEndianInt32(e);
/*int32_t type =*/ readBigEndianInt32(e+4);
int32_t offset = readBigEndianInt32(e+8);
if (offset < 0 || offset >= hsize) {
m_error = "invalid offset in header\n";
return;
}
/*int32_t count =*/ readBigEndianInt32(e+12);
int32_t end = hsize;
if (i < nindex-1) {
end = readBigEndianInt32(e+8+16);
}
if (end < offset) end = offset;
if (end > hsize) end = hsize;
// TODO actually put the data into the objects so the analyzers can use them
/* if (type == 6) {
string s(b+nindex*16+offset, end-offset);
printf("%s\n", s.c_str());
} else if (type == 8 || type == 9) {
list<string> v;
// TODO handle string arrays
}
printf("%i\t%i\t%i\t%i\n", tag, type, offset, count);*/
}
int64_t pos = m_input->position();
if (m_input->read(b, 16, 16) != 16) {
m_error = "could not read payload\n";
return;
}
m_input->reset(pos);
if (BZ2InputStream::checkHeader(b, 16)) {
uncompressionStream = new BZ2InputStream(m_input);
} else if (LZMAInputStream::checkHeader(b, 16)) {
uncompressionStream = new LZMAInputStream(m_input);
} else if (GZipInputStream::checkHeader(b, 16)) {
uncompressionStream = new GZipInputStream(m_input);
} else {
m_error = "Unknown compressed stream type";
return;
};
if (uncompressionStream->status() == Error) {
m_error = uncompressionStream->error();
return;
}
cpio = new CpioInputStream(uncompressionStream);
m_status = cpio->status();
}
RpmInputStream::~RpmInputStream() {
delete uncompressionStream;
delete cpio;
delete headerinfo;
m_entrystream = 0;
}
InputStream*
RpmInputStream::nextEntry() {
if (m_status) return 0;
m_entrystream = cpio->nextEntry();
m_status = cpio->status();
if (m_status == Ok) {
m_entryinfo = cpio->entryInfo();
} else if (m_status == Error) {
m_error = cpio->error();
}
return m_entrystream;
}
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