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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/cpioinputstream.h>
#include <strigi/strigiconfig.h>
#include <strigi/subinputstream.h>
#include <list>
#include <cstring>
using namespace std;
using namespace Strigi;
const char unsigned* CpioInputStream::magic = (const char unsigned *)"070701";
bool
CpioInputStream::checkHeader(const char* data, int32_t datasize) {
if (datasize < 6) return false;
// this check could be more strict
bool ok = memcmp(data, magic, 6) == 0;
return ok;
}
CpioInputStream::CpioInputStream(InputStream* input)
: SubStreamProvider(input) {
m_entryinfo.type = EntryInfo::File;
}
CpioInputStream::~CpioInputStream() {
}
InputStream*
CpioInputStream::nextEntry() {
if (m_status) {
delete m_entrystream;
m_entrystream = 0;
return 0;
}
if (m_entrystream) {
while (m_entrystream->status() == Ok) {
m_entrystream->skip(m_entrystream->size());
}
delete m_entrystream;
m_entrystream = 0;
if (padding) {
m_input->skip(padding);
}
}
readHeader();
m_entrystream = new SubInputStream(m_input, m_entryinfo.size);
if (m_status) {
delete m_entrystream;
m_entrystream = 0;
}
return m_entrystream;
}
void
CpioInputStream::readHeader() {
//const unsigned char *hb;
const char* b;
int32_t toread;
int32_t nread;
// read the first 110 characters
toread = 110;
nread = m_input->read(b, toread, toread);
if (nread != toread) {
m_status = m_input->status();
if (m_status == Eof) {
return;
}
m_error = "Error reading cpio entry: ";
if (nread == -1) {
m_error += m_input->error();
} else {
m_error += " premature end of file.";
}
return;
}
// check header
if (memcmp(b, magic, 6) != 0) {
m_status = Error;
m_error = "CPIO Entry signature is unknown: ";
m_error.append(b, 6);
return;
}
m_entryinfo.size = readHexField(b+54);
m_entryinfo.mtime = readHexField(b+46);
int32_t filenamesize = readHexField(b+94);
if (m_status) {
m_error = "Error parsing entry field.";
return;
}
char namepadding = (char)((filenamesize+2) % 4);
if (namepadding) namepadding = (char)(4 - namepadding);
padding = (char)(m_entryinfo.size % 4);
if (padding) padding = (char)(4 - padding);
// read filename
toread = filenamesize + namepadding;
nread = m_input->read(b, toread, toread);
if (nread != toread) {
m_error = "Error reading cpio entry name.";
m_status = Error;
return;
}
int32_t len = filenamesize - 1;
if (len > 2 && b[0] == '.' && b[1] == '/') {
b += 2;
}
// check if the name is not shorter than specified
len = 0;
while (len < filenamesize && b[len] != '\0') len++;
m_entryinfo.filename = std::string((const char*)b, len);
// if an cpio has an entry 'TRAILER!!!' we are at the end
if ("TRAILER!!!" == m_entryinfo.filename) {
m_status = Eof;
}
}
int32_t
CpioInputStream::readHexField(const char *b) {
int32_t val = 0;
char c;
for (unsigned char i=0; i<8; ++i) {
val <<= 4;
c = b[i];
if (c > 'F') {
val += c - 87;
} else if (c > '9') {
val += c - 55;
} else {
val += c - 48;
}
}
return val;
}
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