RetroArch/file_extract.c
2013-01-24 07:32:15 +01:00

191 lines
5.2 KiB
C

/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2013 - Hans-Kristian Arntzen
*
* RetroArch 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 Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch 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.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include "file_extract.h"
#include "file.h"
#include "compat/strl.h"
#include <stdio.h>
#include <stdlib.h>
#ifdef WANT_RZLIB
#include "deps/rzlib/zlib.h"
#else
#include <zlib.h>
#endif
#include "hash.h"
// Modified from nall::unzip (higan).
#undef GOTO_END_ERROR
#define GOTO_END_ERROR() do { \
RARCH_ERR("ZIP extraction failed at line: %d.\n", __LINE__); \
ret = false; \
goto end; \
} while(0)
static uint32_t read_le(const uint8_t *data, unsigned size)
{
uint32_t val = 0;
size *= 8;
for (unsigned i = 0; i < size; i += 8)
val |= *data++ << i;
return val;
}
static bool inflate_data_to_file(const char *path, uint8_t *cdata,
uint32_t csize, uint32_t size, uint32_t crc32)
{
bool ret = true;
uint8_t *out_data = (uint8_t*)malloc(size);
if (!out_data)
return false;
uint32_t real_crc32 = 0;
z_stream stream = {0};
if (inflateInit2(&stream, -MAX_WBITS) != Z_OK)
GOTO_END_ERROR();
stream.next_in = cdata;
stream.avail_in = csize;
stream.next_out = out_data;
stream.avail_out = size;
if (inflate(&stream, Z_FINISH) != Z_STREAM_END)
{
inflateEnd(&stream);
GOTO_END_ERROR();
}
inflateEnd(&stream);
real_crc32 = crc32_calculate(out_data, size);
if (real_crc32 != crc32)
RARCH_WARN("File CRC differs from ZIP CRC. File: 0x%x, ZIP: 0x%x.\n",
(unsigned)real_crc32, (unsigned)crc32);
if (!write_file(path, out_data, size))
GOTO_END_ERROR();
end:
free(out_data);
return ret;
}
bool zlib_extract_first_rom(char *zip_path, size_t zip_path_size, const char *valid_exts)
{
const uint8_t *footer = NULL;
const uint8_t *directory = NULL;
bool ret = true;
if (!valid_exts)
{
RARCH_ERR("Libretro implementation does not have any valid extensions. Cannot unzip without knowing this.\n");
return false;
}
struct string_list *list = string_split(valid_exts, "|");
if (!list)
return false;
uint8_t *data = NULL;
ssize_t zip_size = read_file(zip_path, (void**)&data);
if (zip_size < 22)
GOTO_END_ERROR();
footer = data + zip_size - 22;
for (;; footer--)
{
if (footer <= data + 22)
GOTO_END_ERROR();
if (read_le(footer, 4) == 0x06054b50)
{
unsigned comment_len = read_le(footer + 20, 2);
if (footer + 22 + comment_len == data + zip_size)
break;
}
}
directory = data + read_le(footer + 16, 4);
for (;;)
{
uint32_t signature = read_le(directory + 0, 4);
if (signature != 0x02014b50)
break;
unsigned cmode = read_le(directory + 10, 2);
uint32_t crc32 = read_le(directory + 16, 4);
uint32_t csize = read_le(directory + 20, 4);
uint32_t size = read_le(directory + 24, 4);
unsigned namelength = read_le(directory + 28, 2);
unsigned extralength = read_le(directory + 30, 2);
unsigned commentlength = read_le(directory + 32, 2);
char filename[PATH_MAX] = {0};
if (namelength >= PATH_MAX)
GOTO_END_ERROR();
memcpy(filename, directory + 46, namelength);
uint32_t offset = read_le(directory + 42, 4);
unsigned offsetNL = read_le(data + offset + 26, 2);
unsigned offsetEL = read_le(data + offset + 28, 2);
uint8_t *cdata = data + offset + 30 + offsetNL + offsetEL;
RARCH_LOG("OFFSET: %u, CSIZE: %u, SIZE: %u.\n", offset + 30 + offsetNL + offsetEL, csize, size);
// Extract first ROM that matches our list.
const char *ext = path_get_extension(filename);
if (ext && string_list_find_elem(list, ext))
{
char new_path[PATH_MAX];
fill_pathname_resolve_relative(new_path, zip_path,
path_basename(filename), sizeof(new_path));
switch (cmode)
{
case 0: // Uncompressed
if (!write_file(new_path, cdata, size))
GOTO_END_ERROR();
goto end;
case 8: // Deflate
if (inflate_data_to_file(new_path, cdata, csize, size, crc32))
{
strlcpy(zip_path, new_path, zip_path_size);
goto end;
}
default:
GOTO_END_ERROR();
}
}
directory += 46 + namelength + extralength + commentlength;
}
RARCH_ERR("Didn't find any ROMS that matched valid extensions for libretro implementation.\n");
GOTO_END_ERROR();
end:
free(data);
string_list_free(list);
return ret;
}