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/*
* This file is part of NumptyPhysics
* Copyright (C) 2008 Tim Edmonds
*
* 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 3 of the
* License, or (at your option) 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.
*
*/
#include "ZipFile.h"
#include <string>
#include <cstring>
#include <cstdio>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>
#include <zlib.h>
//zip file structs and uncompress_int below lifted from navit project (GPL).
struct zip_lfh {
int ziplocsig;
short zipver;
short zipgenfld;
short zipmthd;
short ziptime;
short zipdate;
int zipcrc;
unsigned int zipsize;
unsigned int zipuncmp;
unsigned short zipfnln;
unsigned short zipxtraln;
char zipname[0];
} __attribute__ ((packed));
struct zip_cd {
int zipcensig;
char zipcver;
char zipcos;
char zipcvxt;
char zipcexos;
short zipcflg;
short zipcmthd;
short ziptim;
short zipdat;
int zipccrc;
unsigned int zipcsiz;
unsigned int zipcunc;
unsigned short zipcfnl;
unsigned short zipcxtl;
unsigned short zipccml;
unsigned short zipdsk;
unsigned short zipint;
unsigned int zipext;
unsigned int zipofst;
char zipcfn[0];
} __attribute__ ((packed));
struct zip_eoc {
int zipesig;
unsigned short zipedsk;
unsigned short zipecen;
unsigned short zipenum;
unsigned short zipecenn;
unsigned int zipecsz;
unsigned int zipeofst;
short zipecoml;
char zipecom[0];
} __attribute__ ((packed));
int uncompress_int(unsigned char *dest, int *destLen,
const unsigned char *source, int sourceLen)
{
z_stream stream;
int err;
stream.next_in = (Bytef*)source;
stream.avail_in = (uInt)sourceLen;
stream.next_out = dest;
stream.avail_out = (uInt)*destLen;
stream.zalloc = (alloc_func)0;
stream.zfree = (free_func)0;
err = inflateInit2(&stream, -MAX_WBITS);
if (err != Z_OK) return err;
err = inflate(&stream, Z_FINISH);
if (err != Z_STREAM_END) {
inflateEnd(&stream);
if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
return Z_DATA_ERROR;
return err;
}
*destLen = stream.total_out;
err = inflateEnd(&stream);
return err;
}
ZipFile::ZipFile(const std::string& fn)
{
m_temp = NULL;
m_fd=open(fn.c_str(), O_RDONLY);
struct stat stat;
if (fstat(m_fd, &stat)==0 && S_ISREG(stat.st_mode)) {
m_dataLen = stat.st_size;
// TODO - win32
m_data = (unsigned char*)mmap(NULL,m_dataLen,PROT_READ,MAP_PRIVATE, m_fd, 0);
if ( !m_data ) throw "mmap failed";
if ( *(int*)&m_data[0] != 0x04034b50 ) throw "bad zip magic";
m_eoc = (zip_eoc*)&m_data[m_dataLen-sizeof(zip_eoc)];
m_firstcd = (zip_cd*)&m_data[m_eoc->zipeofst];
if ( m_eoc && m_firstcd ) {
m_entries = m_eoc->zipenum;
} else {
m_entries = 0;
}
} else {
throw "invalid zip file";
}
}
ZipFile::~ZipFile()
{
delete[] m_temp;
if ( m_data ) munmap( m_data, m_dataLen );
if ( m_fd ) close( m_fd );
}
std::string ZipFile::entryName( int n )
{
if ( n < 0 || n >= m_entries ) return std::string();
zip_cd* cd = m_firstcd;
for ( int count=0; cd < (zip_cd*)m_eoc && count < n; count++ ) {
cd = (zip_cd*)(((char*)cd) + sizeof(zip_cd) + cd->zipcfnl + cd->zipcxtl + cd->zipccml);
}
zip_lfh* lfh = (zip_lfh*)&m_data[cd->zipofst];
if ( lfh ) {
return std::string(lfh->zipname,lfh->zipfnln);
}
return std::string();
}
unsigned char* ZipFile::extract( int n, int *l )
{
if ( n < 0 || n >= m_entries ) return NULL;
zip_cd* cd = m_firstcd;
for ( int count=0; cd < (zip_cd*)m_eoc && count < n; count++ ) {
cd = (zip_cd*)(((char*)cd) + sizeof(zip_cd) + cd->zipcfnl + cd->zipcxtl + cd->zipccml);
}
zip_lfh* lfh = (zip_lfh*)&m_data[cd->zipofst];
if ( lfh ) {
*l = lfh->zipuncmp;
unsigned char* zdat = (unsigned char*)lfh + sizeof(*lfh) + lfh->zipfnln + lfh->zipxtraln;
switch (lfh->zipmthd) {
case 0:
return zdat;
case 8:
delete[] m_temp;
m_temp = new unsigned char[*l];
if ( uncompress_int(m_temp, l, zdat, lfh->zipsize) == Z_OK) {
return m_temp;
}
}
}
return NULL;
}
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