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RetroArch/libretro-common/file/archive_file.c

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/* Copyright (C) 2010-2016 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (archive_file.c).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_MMAP
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#endif
#include <compat/strl.h>
#include <file/archive_file.h>
#include <file/file_path.h>
#include <streams/file_stream.h>
#include <retro_stat.h>
#include <retro_miscellaneous.h>
#include <lists/string_list.h>
#include <string/stdstring.h>
#ifdef HAVE_MMAP
/* Closes, unmaps and frees. */
void file_archive_free(file_archive_file_data_t *data)
{
if (!data)
return;
if (data->data)
munmap(data->data, data->size);
if (data->fd >= 0)
close(data->fd);
free(data);
}
const uint8_t *file_archive_data(file_archive_file_data_t *data)
{
if (!data)
return NULL;
return (const uint8_t*)data->data;
}
static size_t file_archive_size(file_archive_file_data_t *data)
{
if (!data)
return 0;
return data->size;
}
static file_archive_file_data_t* file_archive_open(const char *path)
{
file_archive_file_data_t *data = (file_archive_file_data_t*)calloc(1, sizeof(*data));
if (!data)
return NULL;
data->fd = open(path, O_RDONLY);
/* Failed to open archive. */
if (data->fd < 0)
goto error;
data->size = path_get_size(path);
if (!data->size)
return data;
data->data = mmap(NULL, data->size, PROT_READ, MAP_SHARED, data->fd, 0);
if (data->data == MAP_FAILED)
{
data->data = NULL;
/* Failed to mmap() file */
goto error;
}
return data;
error:
file_archive_free(data);
return NULL;
}
#else
/* Closes, unmaps and frees. */
void file_archive_free(file_archive_file_data_t *data)
{
if (!data)
return;
if(data->data)
free(data->data);
free(data);
}
const uint8_t *file_archive_data(file_archive_file_data_t *data)
{
if (!data)
return NULL;
return (const uint8_t*)data->data;
}
static size_t file_archive_size(file_archive_file_data_t *data)
{
if (!data)
return 0;
return data->size;
}
static file_archive_file_data_t* file_archive_open(const char *path)
{
ssize_t ret = -1;
bool read_from_file = false;
file_archive_file_data_t *data = (file_archive_file_data_t*)
calloc(1, sizeof(*data));
if (!data)
return NULL;
read_from_file = filestream_read_file(path, &data->data, &ret);
/* Failed to open archive? */
if (!read_from_file || ret < 0)
goto error;
data->size = ret;
return data;
error:
file_archive_free(data);
return NULL;
}
#endif
static int file_archive_get_file_list_cb(
const char *path,
const char *valid_exts,
const uint8_t *cdata,
unsigned cmode,
uint32_t csize,
uint32_t size,
uint32_t checksum,
struct archive_extract_userdata *userdata)
{
union string_list_elem_attr attr;
struct string_list *ext_list = NULL;
const char *file_ext = NULL;
size_t pathLen = strlen(path);
(void)cdata;
(void)cmode;
(void)csize;
(void)size;
(void)checksum;
memset(&attr, 0, sizeof(attr));
if (!pathLen)
return 0;
if (valid_exts)
ext_list = string_split(valid_exts, "|");
if (ext_list)
{
/* Checks if this entry is a directory or a file. */
char last_char = path[pathLen-1];
/* Skip if directory. */
if (last_char == '/' || last_char == '\\' )
goto error;
file_ext = path_get_extension(path);
if (!file_ext ||
!string_list_find_elem_prefix(ext_list, ".", file_ext))
goto error;
attr.i = RARCH_COMPRESSED_FILE_IN_ARCHIVE;
string_list_free(ext_list);
}
return string_list_append(userdata->list, path, attr);
error:
string_list_free(ext_list);
return 0;
}
static int file_archive_extract_cb(const char *name, const char *valid_exts,
const uint8_t *cdata,
unsigned cmode, uint32_t csize, uint32_t size,
uint32_t checksum, struct archive_extract_userdata *userdata)
{
const char *ext = path_get_extension(name);
/* Extract first file that matches our list. */
if (ext && string_list_find_elem(userdata->ext, ext))
{
char new_path[PATH_MAX_LENGTH] = {0};
char wanted_file[PATH_MAX_LENGTH] = {0};
const char *delim = NULL;
if (userdata->extraction_directory)
fill_pathname_join(new_path, userdata->extraction_directory,
path_basename(name), sizeof(new_path));
else
fill_pathname_resolve_relative(new_path, userdata->archive_path,
path_basename(name), sizeof(new_path));
userdata->first_extracted_file_path = strdup(new_path);
delim = path_get_archive_delim(userdata->archive_path);
if (delim)
strlcpy(wanted_file, delim + 1, sizeof(wanted_file));
if (!string_is_equal_noncase(userdata->extracted_file_path,
wanted_file))
return 1; // keep searching for the right file
if (file_archive_perform_mode(new_path,
valid_exts, cdata, cmode, csize, size,
0, userdata))
userdata->found_file = true;
return 0;
}
return 1;
}
int file_archive_parse_file_init(file_archive_transfer_t *state,
const char *file)
{
char *last = NULL;
char path[PATH_MAX_LENGTH] = {0};
strlcpy(path, file, sizeof(path));
last = (char*)path_get_archive_delim(path);
if (last)
*last = '\0';
state->backend = file_archive_get_file_backend(path);
if (!state->backend)
return -1;
state->handle = file_archive_open(path);
if (!state->handle)
return -1;
state->archive_size = file_archive_size(state->handle);
state->data = file_archive_data(state->handle);
state->footer = 0;
state->directory = 0;
return state->backend->archive_parse_file_init(state, path);
}
/**
* file_archive_decompress_data_to_file:
* @path : filename path of archive.
* @valid_exts : Valid extensions of archive to be parsed.
* If NULL, allow all.
* @cdata : input data.
* @csize : size of input data.
* @size : output file size
* @checksum : CRC32 checksum from input data.
*
* Decompress data to file.
*
* Returns: true (1) on success, otherwise false (0).
**/
static int file_archive_decompress_data_to_file(
file_archive_file_handle_t *handle,
int ret,
const char *path,
const char *valid_exts,
const uint8_t *cdata,
uint32_t csize,
uint32_t size,
uint32_t checksum)
{
if (!handle || ret == -1)
{
ret = 0;
goto end;
}
#if 0
handle->real_checksum = handle->backend->stream_crc_calculate(
0, handle->data, size);
if (handle->real_checksum != checksum)
{
/* File CRC difers from archive CRC. */
printf("File CRC differs from archive CRC. File: 0x%x, Archive: 0x%x.\n",
(unsigned)handle->real_checksum, (unsigned)checksum);
}
#endif
if (!filestream_write_file(path, handle->data, size))
{
ret = false;
goto end;
}
end:
handle->backend->stream_free(handle->stream);
if (handle && handle->data)
free(handle->data);
return ret;
}
void file_archive_parse_file_iterate_stop(file_archive_transfer_t *state)
{
if (!state || !state->handle)
return;
state->type = ARCHIVE_TRANSFER_DEINIT;
file_archive_parse_file_iterate(state, NULL, NULL, NULL, NULL, NULL);
}
int file_archive_parse_file_iterate(
file_archive_transfer_t *state,
bool *returnerr,
const char *file,
const char *valid_exts,
file_archive_file_cb file_cb,
struct archive_extract_userdata *userdata)
{
if (!state)
return -1;
switch (state->type)
{
case ARCHIVE_TRANSFER_NONE:
break;
case ARCHIVE_TRANSFER_INIT:
if (file_archive_parse_file_init(state, file) == 0)
{
if (userdata)
userdata->context = state->stream;
state->type = ARCHIVE_TRANSFER_ITERATE;
}
else
state->type = ARCHIVE_TRANSFER_DEINIT_ERROR;
break;
case ARCHIVE_TRANSFER_ITERATE:
{
const struct file_archive_file_backend *backend =
file_archive_get_file_backend(file);
if (backend)
{
int ret = backend->archive_parse_file_iterate_step(state,
valid_exts, userdata, file_cb);
if (ret != 1)
state->type = ARCHIVE_TRANSFER_DEINIT;
if (ret == -1)
state->type = ARCHIVE_TRANSFER_DEINIT_ERROR;
/* early return to prevent deinit from never firing */
return 0;
}
else
return -1;
}
break;
case ARCHIVE_TRANSFER_DEINIT_ERROR:
*returnerr = false;
case ARCHIVE_TRANSFER_DEINIT:
if (state->handle)
{
file_archive_free(state->handle);
state->handle = NULL;
}
if (state->stream && state->backend)
{
state->backend->stream_free(state->stream);
if (state->stream)
free(state->stream);
state->stream = NULL;
if (userdata)
userdata->context = NULL;
}
break;
}
if (state->type == ARCHIVE_TRANSFER_DEINIT ||
state->type == ARCHIVE_TRANSFER_DEINIT_ERROR)
return -1;
return 0;
}
/**
* file_archive_parse_file:
* @file : filename path of archive
* @valid_exts : Valid extensions of archive to be parsed.
* If NULL, allow all.
* @file_cb : file_cb function pointer
* @userdata : userdata to pass to file_cb function pointer.
*
* Low-level file parsing. Enumerates over all files and calls
* file_cb with userdata.
*
* Returns: true (1) on success, otherwise false (0).
**/
static bool file_archive_parse_file(const char *file, const char *valid_exts,
file_archive_file_cb file_cb, struct archive_extract_userdata *userdata)
{
file_archive_transfer_t state = {0};
bool returnerr = true;
state.type = ARCHIVE_TRANSFER_INIT;
for (;;)
{
if (file_archive_parse_file_iterate(&state, &returnerr, file,
valid_exts, file_cb, userdata) != 0)
break;
}
return returnerr;
}
int file_archive_parse_file_progress(file_archive_transfer_t *state)
{
/* FIXME: this estimate is worse than before */
ptrdiff_t delta = 0;
if (!state || state->archive_size == 0)
return 0;
delta = state->directory - state->data;
return delta * 100 / state->archive_size;
}
/**
* file_archive_extract_file:
* @archive_path : filename path to archive.
* @archive_path_size : size of archive.
* @valid_exts : valid extensions for the file.
* @extraction_directory : the directory to extract temporary
* file to.
*
* Extract file from archive. If no file inside the archive is
* specified, the first file found will be used.
*
* Returns : true (1) on success, otherwise false (0).
**/
bool file_archive_extract_file(
char *archive_path,
size_t archive_path_size,
const char *valid_exts,
const char *extraction_directory,
char *out_path, size_t len)
{
struct string_list *list = NULL;
bool ret = true;
struct archive_extract_userdata userdata = {0};
/* We cannot extract if the libretro
* implementation does not have any valid extensions. */
if (!valid_exts)
return false;
list = string_split(valid_exts, "|");
if (!list)
{
ret = false;
goto end;
}
userdata.archive_path = archive_path;
userdata.archive_path_size = archive_path_size;
userdata.extraction_directory = extraction_directory;
userdata.ext = list;
userdata.list = NULL;
userdata.context = NULL;
userdata.list_only = false;
if (!file_archive_parse_file(archive_path, valid_exts,
file_archive_extract_cb, &userdata))
{
/* Parsing file archive failed. */
ret = false;
goto end;
}
if (!userdata.found_file)
{
/* Didn't find any file that matched valid extensions
* for libretro implementation. */
ret = false;
goto end;
}
if (*userdata.first_extracted_file_path)
strlcpy(out_path, userdata.first_extracted_file_path, len);
end:
if (userdata.first_extracted_file_path)
free(userdata.first_extracted_file_path);
if (list)
string_list_free(list);
return ret;
}
/**
* file_archive_get_file_list:
* @path : filename path of archive
*
* Returns: string listing of files from archive on success, otherwise NULL.
**/
struct string_list *file_archive_get_file_list(const char *path,
const char *valid_exts)
{
struct archive_extract_userdata userdata = {0};
userdata.list_only = true;
userdata.list = string_list_new();
if (!userdata.list)
goto error;
if (!file_archive_parse_file(path, valid_exts,
file_archive_get_file_list_cb, &userdata))
goto error;
return userdata.list;
error:
if (userdata.list)
string_list_free(userdata.list);
return NULL;
}
bool file_archive_perform_mode(const char *path, const char *valid_exts,
const uint8_t *cdata, unsigned cmode, uint32_t csize, uint32_t size,
uint32_t crc32, struct archive_extract_userdata *userdata)
{
switch (cmode)
{
case ARCHIVE_MODE_UNCOMPRESSED:
if (!filestream_write_file(path, cdata, size))
goto error;
break;
case ARCHIVE_MODE_COMPRESSED:
{
int ret = 0;
file_archive_file_handle_t handle = {0};
handle.backend = file_archive_get_file_backend(userdata->archive_path);
handle.stream = userdata->context;
if (!handle.backend->stream_decompress_data_to_file_init(&handle,
cdata, csize, size))
goto error;
do{
ret = handle.backend->stream_decompress_data_to_file_iterate(
handle.stream);
}while(ret == 0);
if (!file_archive_decompress_data_to_file(&handle,
ret, path, valid_exts,
cdata, csize, size, crc32))
goto error;
}
break;
default:
goto error;
}
return true;
error:
return false;
}
/* Generic compressed file loader.
* Extracts to buf, unless optional_filename != 0
* Then extracts to optional_filename and leaves buf alone.
*/
int file_archive_compressed_read(
const char * path, void **buf,
const char* optional_filename, ssize_t *length)
{
const struct file_archive_file_backend *backend = NULL;
int ret = 0;
struct string_list *str_list = file_archive_filename_split(path);
/* Safety check.
* If optional_filename and optional_filename
* exists, we simply return 0,
* hoping that optional_filename is the
* same as requested.
*/
if (optional_filename && path_file_exists(optional_filename))
{
*length = 0;
string_list_free(str_list);
return 1;
}
/* We assure that there is something after the '#' symbol.
*
* This error condition happens for example, when
* path = /path/to/file.7z, or
* path = /path/to/file.7z#
*/
if (str_list->size <= 1)
goto error;
backend = file_archive_get_file_backend(str_list->elems[0].data);
*length = backend->compressed_file_read(str_list->elems[0].data,
str_list->elems[1].data, buf, optional_filename);
if (*length != -1)
ret = 1;
string_list_free(str_list);
return ret;
error:
/* could not extract string and substring. */
string_list_free(str_list);
*length = 0;
return 0;
}
struct string_list *file_archive_file_list_new(const char *path,
const char* ext)
{
#ifdef HAVE_COMPRESSION
bool compressed = path_is_compressed_file(path);
if (compressed)
return file_archive_get_file_list(path, ext);
#endif
return NULL;
}
/**
* file_archive_filename_split:
* @str : filename to turn into a string list
*
* Creates a new string list based on filename @path, delimited by a hash (#).
*
* Returns: new string list if successful, otherwise NULL.
*/
struct string_list *file_archive_filename_split(const char *path)
{
union string_list_elem_attr attr;
struct string_list *list = string_list_new();
const char *delim = NULL;
memset(&attr, 0, sizeof(attr));
delim = path_get_archive_delim(path);
if (delim)
{
/* add archive path to list first */
if (!string_list_append_n(list, path, delim - path, attr))
goto error;
/* now add the path within the archive */
delim++;
if (*delim)
{
if (!string_list_append(list, delim, attr))
goto error;
}
}
else
if (!string_list_append(list, path, attr))
goto error;
return list;
error:
string_list_free(list);
return NULL;
}
const struct file_archive_file_backend *file_archive_get_zlib_file_backend(void)
{
#ifdef HAVE_ZLIB
return &zlib_backend;
#else
return NULL;
#endif
}
const struct file_archive_file_backend *file_archive_get_7z_file_backend(void)
{
#ifdef HAVE_7ZIP
return &sevenzip_backend;
#else
return NULL;
#endif
}
const struct file_archive_file_backend* file_archive_get_file_backend(const char *path)
{
const char *file_ext = NULL;
char *last = NULL;
char newpath[PATH_MAX_LENGTH] = {0};
strlcpy(newpath, path, sizeof(newpath));
last = (char*)path_get_archive_delim(newpath);
if (last)
*last = '\0';
file_ext = path_get_extension(newpath);
#ifdef HAVE_7ZIP
if (string_is_equal_noncase(file_ext, "7z"))
return &sevenzip_backend;
#endif
#ifdef HAVE_ZLIB
if (string_is_equal_noncase(file_ext, "zip"))
return &zlib_backend;
#endif
return NULL;
}
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