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/*
* ipsw.h
* Utilities for extracting and manipulating IPSWs
*
* Copyright (c) 2010 Joshua Hill. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zip.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ipsw.h"
#include "idevicerestore.h"
#define BUFSIZE 0x100000
typedef struct {
struct zip* zip;
} ipsw_archive;
ipsw_archive* ipsw_open(const char* ipsw);
void ipsw_close(ipsw_archive* archive);
ipsw_archive* ipsw_open(const char* ipsw) {
int err = 0;
ipsw_archive* archive = (ipsw_archive*) malloc(sizeof(ipsw_archive));
if (archive == NULL) {
error("ERROR: Out of memory\n");
return NULL;
}
archive->zip = zip_open(ipsw, 0, &err);
if (archive->zip == NULL) {
error("ERROR: zip_open: %s: %d\n", ipsw, err);
free(archive);
return NULL;
}
return archive;
}
int ipsw_extract_to_file(const char* ipsw, const char* infile, const char* outfile) {
ipsw_archive* archive = ipsw_open(ipsw);
if (archive == NULL || archive->zip == NULL) {
error("ERROR: Invalid archive\n");
return -1;
}
int zindex = zip_name_locate(archive->zip, infile, 0);
if (zindex < 0) {
error("ERROR: zip_name_locate: %s\n", infile);
return -1;
}
struct zip_stat zstat;
zip_stat_init(&zstat);
if (zip_stat_index(archive->zip, zindex, 0, &zstat) != 0) {
error("ERROR: zip_stat_index: %s\n", infile);
return -1;
}
char* buffer = (char*) malloc(BUFSIZE);
if (buffer == NULL) {
error("ERROR: Unable to allocate memory\n");
return -1;
}
struct zip_file* zfile = zip_fopen_index(archive->zip, zindex, 0);
if (zfile == NULL) {
error("ERROR: zip_fopen_index: %s\n", infile);
return -1;
}
FILE* fd = fopen(outfile, "wb");
if (fd == NULL) {
error("ERROR: Unable to open output file: %s\n", outfile);
zip_fclose(zfile);
return -1;
}
int i = 0;
int size = 0;
int count = 0;
for (i = zstat.size; i > 0; i -= count) {
if (i < BUFSIZE)
size = i;
else
size = BUFSIZE;
count = zip_fread(zfile, buffer, size);
if (count < 0) {
error("ERROR: zip_fread: %s\n", infile);
zip_fclose(zfile);
free(buffer);
return -1;
}
fwrite(buffer, 1, count, fd);
debug(".");
}
debug("\n");
fclose(fd);
zip_fclose(zfile);
ipsw_close(archive);
free(buffer);
return 0;
}
int ipsw_extract_to_memory(const char* ipsw, const char* infile, char** pbuffer, uint32_t* psize) {
ipsw_archive* archive = ipsw_open(ipsw);
if (archive == NULL || archive->zip == NULL) {
error("ERROR: Invalid archive\n");
return -1;
}
int zindex = zip_name_locate(archive->zip, infile, 0);
if (zindex < 0) {
error("ERROR: zip_name_locate: %s\n", infile);
return -1;
}
struct zip_stat zstat;
zip_stat_init(&zstat);
if (zip_stat_index(archive->zip, zindex, 0, &zstat) != 0) {
error("ERROR: zip_stat_index: %s\n", infile);
return -1;
}
struct zip_file* zfile = zip_fopen_index(archive->zip, zindex, 0);
if (zfile == NULL) {
error("ERROR: zip_fopen_index: %s\n", infile);
return -1;
}
int size = zstat.size;
char* buffer = (unsigned char*) malloc(size);
if (buffer == NULL) {
error("ERROR: Out of memory\n");
zip_fclose(zfile);
return -1;
}
if (zip_fread(zfile, buffer, size) != size) {
error("ERROR: zip_fread: %s\n", infile);
zip_fclose(zfile);
free(buffer);
return -1;
}
zip_fclose(zfile);
ipsw_close(archive);
*pbuffer = buffer;
*psize = size;
return 0;
}
void ipsw_close(ipsw_archive* archive) {
if (archive != NULL) {
zip_unchange_all(archive->zip);
zip_close(archive->zip);
free(archive);
}
}
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