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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/arinputstream.h>
#include <strigi/subinputstream.h>
#include <stdlib.h>
#include <cstring>
using namespace Strigi;
bool
ArInputStream::checkHeader(const char* data, int32_t datasize) {
static const char magic[] = {0x21,0x3c,0x61,0x72,0x63,0x68,0x3e,0x0a};
if (datasize < 8) return false;
bool ok = std::memcmp(data, magic, 8) == 0;
return ok;
}
ArInputStream::ArInputStream(InputStream* input)
: SubStreamProvider(input) {
// check header
const char*b;
if (input->read(b, 8, 8) != 8 || !checkHeader(b, 8)) {
m_status = Error;
}
}
ArInputStream::~ArInputStream() {
}
InputStream*
ArInputStream::nextEntry() {
if (m_status) return 0;
if (m_entrystream) {
m_entrystream->skip(m_entrystream->size());
delete m_entrystream;
m_entrystream = 0;
}
readHeader();
if (m_status) return 0;
m_entrystream = new SubInputStream(m_input, m_entryinfo.size);
return m_entrystream;
}
void
ArInputStream::readHeader() {
const char *b;
int32_t toread;
int32_t nread;
int64_t pos = m_input->position();
if (pos%2) {
m_input->skip(1);
}
// read the first 60 characters
toread = 60;
nread = m_input->read(b, toread, toread);
if (m_input->status() == Error) {
m_error = "Error reading ar header: ";
m_error += m_input->error();
m_status = Error;
return;
}
if (nread <= 1) { // allow for a closing byte
m_status = Eof;
return;
}
if (nread != toread) {
m_error = "Error reading ar header: premature end of file.";
m_status = Error;
return;
}
int len;
for (len=0; len<16; len++) {
char c = b[len];
if (c == ' ' || c == '/' || c == '\0') {
break;
}
}
// we must copy this string to safely call atoi
char bc[61];
std::memcpy(bc, b, 60);
bc[60] = '\0';
m_entryinfo.size = atoi(bc+48);
if (m_entryinfo.size < 0) {
m_error = "Error: negative file size.";
m_status = Error;
return;
}
m_entryinfo.mtime = atoi(bc+16);
if (len == 0) {
if (b[1] == '/') {
// fprintf(stderr, "SIZE: %lli\n", m_entryinfo.size);
nread = m_input->read(b, (int32_t)m_entryinfo.size, (int32_t)m_entryinfo.size);
if (nread != m_entryinfo.size) {
m_error = "premature end of stream";
m_status = Error;
return;
}
gnufilenames.assign(b, (unsigned int)m_entryinfo.size);
readHeader();
} else if (b[1] == ' ') {
m_input->skip(m_entryinfo.size);
readHeader();
} else {
uint p = atoi(bc+1);
if (gnufilenames.length() <= p) {
m_error = "Invalid name field.";
m_status = Error;
return;
}
const char* c = gnufilenames.c_str() + p;
const char* e = std::strchr(c, '/');
if (e) {
m_entryinfo.filename = std::string(c, e-c);
} else {
m_entryinfo.filename = c;
}
}
} else {
m_entryinfo.filename = std::string(b, len);
}
m_entryinfo.type = Strigi::EntryInfo::File;
}
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