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RetroArch/tasks/task_save.c

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/* RetroArch - A frontend for libretro.
* Copyright (C) 2011-2016 - Daniel De Matteis
*
* 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 <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/types.h>
#include <string.h>
#include <time.h>
#ifdef _WIN32
#include <direct.h>
#else
#include <unistd.h>
#endif
#include <errno.h>
#include <compat/strl.h>
#include <retro_assert.h>
#include <lists/string_list.h>
#include <streams/file_stream.h>
#include <rthreads/rthreads.h>
#include <file/file_path.h>
#ifdef HAVE_CONFIG_H
#include "../core.h"
#endif
#include "../core.h"
#include "../file_path_special.h"
#include "../configuration.h"
#include "../msg_hash.h"
#include "../runloop.h"
#include "../verbosity.h"
#include "tasks_internal.h"
/* TODO/FIXME - turn this into actual task */
static struct string_list *task_save_files = NULL;
typedef struct ram_type ram_type_t;
struct ram_type
{
const char *path;
int type;
};
struct save_state_buf
{
void* data;
char path[PATH_MAX_LENGTH];
size_t size;
};
/* Holds the previous saved state
* Can be restored to disk with undo_save_state(). */
static struct save_state_buf undo_save_buf;
/* Holds the data from before a load_state() operation
* Can be restored with undo_load_state(). */
static struct save_state_buf undo_load_buf;
struct sram_block
{
unsigned type;
void *data;
size_t size;
};
#ifdef HAVE_THREADS
typedef struct autosave autosave_t;
/* Autosave support. */
struct autosave_st
{
autosave_t **list;
unsigned num;
};
struct autosave
{
volatile bool quit;
slock_t *lock;
slock_t *cond_lock;
scond_t *cond;
sthread_t *thread;
void *buffer;
const void *retro_buffer;
const char *path;
size_t bufsize;
unsigned interval;
};
static struct autosave_st autosave_state;
/**
* autosave_thread:
* @data : pointer to autosave object
*
* Callback function for (threaded) autosave.
**/
static void autosave_thread(void *data)
{
bool first_log = true;
autosave_t *save = (autosave_t*)data;
while (!save->quit)
{
bool differ;
slock_lock(save->lock);
differ = memcmp(save->buffer, save->retro_buffer,
save->bufsize) != 0;
if (differ)
memcpy(save->buffer, save->retro_buffer, save->bufsize);
slock_unlock(save->lock);
if (differ)
{
/* Should probably deal with this more elegantly. */
FILE *file = fopen(save->path, "wb");
if (file)
{
bool failed = false;
/* Avoid spamming down stderr ... */
if (first_log)
{
RARCH_LOG("Autosaving SRAM to \"%s\", will continue to check every %u seconds ...\n",
save->path, save->interval);
first_log = false;
}
else
RARCH_LOG("SRAM changed ... autosaving ...\n");
failed |= fwrite(save->buffer, 1, save->bufsize, file)
!= save->bufsize;
failed |= fflush(file) != 0;
failed |= fclose(file) != 0;
if (failed)
RARCH_WARN("Failed to autosave SRAM. Disk might be full.\n");
}
}
slock_lock(save->cond_lock);
if (!save->quit)
scond_wait_timeout(save->cond, save->cond_lock,
save->interval * 1000000LL);
slock_unlock(save->cond_lock);
}
}
/**
* autosave_new:
* @path : path to autosave file
* @data : pointer to buffer
* @size : size of @data buffer
* @interval : interval at which saves should be performed.
*
* Create and initialize autosave object.
*
* Returns: pointer to new autosave_t object if successful, otherwise
* NULL.
**/
static autosave_t *autosave_new(const char *path,
const void *data, size_t size,
unsigned interval)
{
autosave_t *handle = (autosave_t*)calloc(1, sizeof(*handle));
if (!handle)
goto error;
handle->bufsize = size;
handle->interval = interval;
handle->path = path;
handle->buffer = malloc(size);
handle->retro_buffer = data;
if (!handle->buffer)
goto error;
memcpy(handle->buffer, handle->retro_buffer, handle->bufsize);
handle->lock = slock_new();
handle->cond_lock = slock_new();
handle->cond = scond_new();
handle->thread = sthread_create(autosave_thread, handle);
return handle;
error:
if (handle)
free(handle);
return NULL;
}
/**
* autosave_free:
* @handle : pointer to autosave object
*
* Frees autosave object.
**/
static void autosave_free(autosave_t *handle)
{
if (!handle)
return;
slock_lock(handle->cond_lock);
handle->quit = true;
slock_unlock(handle->cond_lock);
scond_signal(handle->cond);
sthread_join(handle->thread);
slock_free(handle->lock);
slock_free(handle->cond_lock);
scond_free(handle->cond);
free(handle->buffer);
free(handle);
}
/**
* autosave_lock:
*
* Lock autosave.
**/
void autosave_lock(void)
{
unsigned i;
for (i = 0; i < autosave_state.num; i++)
{
if (autosave_state.list[i])
slock_lock(autosave_state.list[i]->lock);
}
}
/**
* autosave_unlock:
*
* Unlocks autosave.
**/
void autosave_unlock(void)
{
unsigned i;
for (i = 0; i < autosave_state.num; i++)
{
if (autosave_state.list[i])
slock_unlock(autosave_state.list[i]->lock);
}
}
void autosave_init(void)
{
unsigned i;
autosave_t **list = NULL;
settings_t *settings = config_get_ptr();
if (settings->autosave_interval < 1 || !task_save_files)
return;
list = (autosave_t**)calloc(task_save_files->size,
sizeof(*autosave_state.list));
if (!list)
return;
autosave_state.list = list;
autosave_state.num = task_save_files->size;
for (i = 0; i < task_save_files->size; i++)
{
retro_ctx_memory_info_t mem_info;
const char *path = task_save_files->elems[i].data;
unsigned type = task_save_files->elems[i].attr.i;
mem_info.id = type;
core_get_memory(&mem_info);
if (mem_info.size <= 0)
continue;
autosave_state.list[i] = autosave_new(path,
mem_info.data,
mem_info.size,
settings->autosave_interval);
if (!autosave_state.list[i])
RARCH_WARN("%s\n", msg_hash_to_str(MSG_AUTOSAVE_FAILED));
}
}
void autosave_deinit(void)
{
unsigned i;
for (i = 0; i < autosave_state.num; i++)
autosave_free(autosave_state.list[i]);
if (autosave_state.list)
free(autosave_state.list);
autosave_state.list = NULL;
autosave_state.num = 0;
}
#endif
static unsigned content_allocate_save_blocks(struct sram_block *blocks)
{
unsigned i;
unsigned num_blocks = 0;
settings_t *settings = config_get_ptr();
/* Checking of SRAM overwrite, the backing up of it and
flushing. */
if (settings->block_sram_overwrite && task_save_files
&& task_save_files->size)
{
RARCH_LOG("%s.\n",
msg_hash_to_str(MSG_BLOCKING_SRAM_OVERWRITE));
blocks = (struct sram_block*)
calloc(task_save_files->size, sizeof(*blocks));
if (blocks)
{
num_blocks = task_save_files->size;
for (i = 0; i < num_blocks; i++)
blocks[i].type = task_save_files->elems[i].attr.i;
}
}
for (i = 0; i < num_blocks; i++)
{
retro_ctx_memory_info_t mem_info;
mem_info.id = blocks[i].type;
core_get_memory(&mem_info);
blocks[i].size = mem_info.size;
}
for (i = 0; i < num_blocks; i++)
if (blocks[i].size)
blocks[i].data = malloc(blocks[i].size);
/* Backup current SRAM which is overwritten by unserialize. */
for (i = 0; i < num_blocks; i++)
{
if (blocks[i].data)
{
retro_ctx_memory_info_t mem_info;
void *dst = NULL;
const void *src = NULL;
mem_info.id = blocks[i].type;
core_get_memory(&mem_info);
src = mem_info.data;
dst = blocks[i].data;
if (src)
memcpy(dst, src, blocks[i].size);
}
}
return num_blocks;
}
static void content_flush_save_blocks(struct sram_block *blocks,
unsigned num_blocks)
{
unsigned i;
/* Flush back. */
for (i = 0; i < num_blocks; i++)
{
if (blocks[i].data)
{
retro_ctx_memory_info_t mem_info;
const void *src = NULL;
void *dst = NULL;
mem_info.id = blocks[i].type;
core_get_memory(&mem_info);
src = blocks[i].data;
dst = mem_info.data;
if (dst)
memcpy(dst, src, blocks[i].size);
}
}
for (i = 0; i < num_blocks; i++)
free(blocks[i].data);
free(blocks);
}
/**
* undo_load_state:
* Revert to the state before a state was loaded.
*
* Returns: true if successful, false otherwise.
**/
bool content_undo_load_state(void)
{
retro_ctx_serialize_info_t serial_info;
size_t temp_data_size;
bool ret = false;
void* temp_data = NULL;
unsigned num_blocks = 0;
struct sram_block *blocks = NULL;
RARCH_LOG("%s: \"%s\".\n",
msg_hash_to_str(MSG_LOADING_STATE),
undo_load_buf.path);
RARCH_LOG("%s: %u %s.\n",
msg_hash_to_str(MSG_STATE_SIZE),
undo_load_buf.size,
msg_hash_to_str(MSG_BYTES));
num_blocks = content_allocate_save_blocks(blocks);
/* We need to make a temporary copy of the buffer, to allow the swap below */
temp_data = malloc(undo_load_buf.size);
temp_data_size = undo_load_buf.size;
memcpy(temp_data, undo_load_buf.data, undo_load_buf.size);
serial_info.data_const = temp_data;
serial_info.size = temp_data_size;
/* Swap the current state with the backup state. This way, we can undo
what we're undoing */
content_save_state("RAM", false);
ret = core_unserialize(&serial_info);
/* Clean up the temporary copy */
free(temp_data);
temp_data = NULL;
content_flush_save_blocks(blocks, num_blocks);
if (!ret)
{
RARCH_ERR("%s \"%s\".\n",
msg_hash_to_str(MSG_FAILED_TO_UNDO_LOAD_STATE),
undo_load_buf.path);
}
return ret;
}
/**
* undo_save_state:
* Reverts the last save operation
*
* Returns: true if successful, false otherwise.
**/
bool content_undo_save_state(void)
{
bool ret = filestream_write_file(undo_save_buf.path,
undo_save_buf.data, undo_save_buf.size);
/* Wipe the save file buffer as it's intended to be one use only */
undo_save_buf.path[0] = '\0';
undo_save_buf.size = 0;
if (undo_save_buf.data)
{
free(undo_save_buf.data);
undo_save_buf.data = NULL;
}
if (!ret)
{
RARCH_ERR("%s \"%s\".\n",
msg_hash_to_str(MSG_FAILED_TO_UNDO_SAVE_STATE),
undo_save_buf.path);
}
return ret;
}
/* TODO/FIXME - turn this into actual task */
/**
* save_state:
* @path : path of saved state that shall be written to.
* @save_to_disk: If false, saves the state onto undo_load_buf.
* Save a state from memory to disk.
*
* Returns: true if successful, false otherwise.
**/
bool content_save_state(const char *path, bool save_to_disk)
{
retro_ctx_serialize_info_t serial_info;
retro_ctx_size_info_t info;
bool ret = false;
void *data = NULL;
core_serialize_size(&info);
RARCH_LOG("%s: \"%s\".\n",
msg_hash_to_str(MSG_SAVING_STATE),
path);
if (info.size == 0)
return false;
data = malloc(info.size);
if (!data)
return false;
RARCH_LOG("%s: %d %s.\n",
msg_hash_to_str(MSG_STATE_SIZE),
(int)info.size,
msg_hash_to_str(MSG_BYTES));
serial_info.data = data;
serial_info.size = info.size;
ret = core_serialize(&serial_info);
if (ret)
{
if (save_to_disk)
{
if (path_file_exists(path))
{
/* Before overwritting the savestate file, load it into a buffer
to allow undo_save_state() to work */
/* TODO/FIXME - Use msg_hash_to_str here */
RARCH_LOG("%s\n",
"File already exists. Saving to backup buffer...");
content_load_state(path, true);
}
ret = filestream_write_file(path, data, info.size);
}
else
{
/* save_to_disk is false, which means we are saving the state
in undo_load_buf to allow content_undo_load_state() to restore it */
/* If we were holding onto an old state already, clean it up first */
if (undo_load_buf.data)
{
free(undo_load_buf.data);
undo_load_buf.data = NULL;
}
undo_load_buf.data = malloc(info.size);
if (!undo_load_buf.data)
{
free(data);
return false;
}
memcpy(undo_load_buf.data, data, info.size);
undo_load_buf.size = info.size;
strlcpy(undo_load_buf.path, path, sizeof(undo_load_buf.path));
}
}
else
{
RARCH_ERR("%s \"%s\".\n",
msg_hash_to_str(MSG_FAILED_TO_SAVE_STATE_TO),
path);
}
free(data);
return ret;
}
/**
* content_load_state:
* @path : path that state will be loaded from.
* @load_to_backup_buffer: If true, the state will be loaded into undo_save_buf.
* Load a state from disk to memory.
*
* Returns: true if successful, false otherwise.
*
*
**/
bool content_load_state(const char *path, bool load_to_backup_buffer)
{
ssize_t size;
retro_ctx_serialize_info_t serial_info;
unsigned num_blocks = 0;
void *buf = NULL;
struct sram_block *blocks = NULL;
bool ret = filestream_read_file(path, &buf, &size);
RARCH_LOG("%s: \"%s\".\n",
msg_hash_to_str(MSG_LOADING_STATE),
path);
if (!ret || size < 0)
goto error;
RARCH_LOG("%s: %u %s.\n",
msg_hash_to_str(MSG_STATE_SIZE),
(unsigned)size,
msg_hash_to_str(MSG_BYTES));
/* This means we're backing up the file in memory, so content_undo_save_state()
can restore it */
if (load_to_backup_buffer)
{
/* If we were previously backing up a file, let go of it first */
if (undo_save_buf.data)
{
free(undo_save_buf.data);
undo_save_buf.data = NULL;
}
undo_save_buf.data = malloc(size);
if (!undo_save_buf.data)
goto error;
memcpy(undo_save_buf.data, buf, size);
undo_save_buf.size = size;
strlcpy(undo_save_buf.path, path, sizeof(undo_save_buf.path));
free(buf);
return true;
}
num_blocks = content_allocate_save_blocks(blocks);
serial_info.data_const = buf;
serial_info.size = size;
/* Backup the current state so we can undo this load */
content_save_state("RAM", false);
ret = core_unserialize(&serial_info);
content_flush_save_blocks(blocks, num_blocks);
if (!ret)
goto error;
free(buf);
return true;
error:
RARCH_ERR("%s \"%s\".\n",
msg_hash_to_str(MSG_FAILED_TO_LOAD_STATE),
path);
free(buf);
return false;
}
bool content_rename_state(const char *origin, const char *dest)
{
int ret = 0;
if (path_file_exists(dest))
unlink(dest);
ret = rename (origin, dest);
if (!ret)
return true;
RARCH_LOG("Error %d renaming file %s\n", ret, origin);
return false;
}
/*
*
* TODO/FIXME: Figure out when and where this should be called.
* As it is, when e.g. closing Gambatte, we get the same printf message 4 times.
*
*/
bool content_reset_savestate_backups(void)
{
RARCH_LOG("Resetting undo buffers.\n");
if (undo_save_buf.data)
{
free(undo_save_buf.data);
undo_save_buf.data = NULL;
}
undo_save_buf.path[0] = '\0';
undo_save_buf.size = 0;
if (undo_load_buf.data)
{
free(undo_load_buf.data);
undo_load_buf.data = NULL;
}
undo_load_buf.path[0] = '\0';
undo_load_buf.size = 0;
return true;
}
bool content_undo_load_buf_is_empty(void)
{
return undo_load_buf.data == NULL || undo_load_buf.size == 0;
}
bool content_undo_save_buf_is_empty(void)
{
return undo_save_buf.data == NULL || undo_save_buf.size == 0;
}
static bool content_get_memory(retro_ctx_memory_info_t *mem_info,
ram_type_t *ram, unsigned slot)
{
ram->type = task_save_files->elems[slot].attr.i;
ram->path = task_save_files->elems[slot].data;
mem_info->id = ram->type;
core_get_memory(mem_info);
if (!mem_info->data || mem_info->size == 0)
return false;
return true;
}
/**
* content_load_ram_file:
* @path : path of RAM state that will be loaded from.
* @type : type of memory
*
* Load a RAM state from disk to memory.
*/
bool content_load_ram_file(unsigned slot)
{
ssize_t rc;
ram_type_t ram;
retro_ctx_memory_info_t mem_info;
void *buf = NULL;
if (!content_get_memory(&mem_info, &ram, slot))
return false;
if (!filestream_read_file(ram.path, &buf, &rc))
return false;
if (rc > 0)
{
if (rc > (ssize_t)mem_info.size)
{
RARCH_WARN("SRAM is larger than implementation expects, "
"doing partial load (truncating %u %s %s %u).\n",
(unsigned)rc,
msg_hash_to_str(MSG_BYTES),
msg_hash_to_str(MSG_TO),
(unsigned)mem_info.size);
rc = mem_info.size;
}
memcpy(mem_info.data, buf, rc);
}
if (buf)
free(buf);
return true;
}
/**
* dump_to_file_desperate:
* @data : pointer to data buffer.
* @size : size of @data.
* @type : type of file to be saved.
*
* Attempt to save valuable RAM data somewhere.
**/
static bool dump_to_file_desperate(const void *data,
size_t size, unsigned type)
{
time_t time_;
char timebuf[256] = {0};
char application_data[PATH_MAX_LENGTH] = {0};
char path[PATH_MAX_LENGTH] = {0};
if (!fill_pathname_application_data(application_data,
sizeof(application_data)))
return false;
snprintf(path, sizeof(path), "%s/RetroArch-recovery-%u",
application_data, type);
time(&time_);
strftime(timebuf, sizeof(timebuf), "%Y-%m-%d-%H-%M-%S", localtime(&time_));
strlcat(path, timebuf, sizeof(path));
if (!filestream_write_file(path, data, size))
return false;
RARCH_WARN("Succeeded in saving RAM data to \"%s\".\n", path);
return true;
}
/**
* content_save_ram_file:
* @path : path of RAM state that shall be written to.
* @type : type of memory
*
* Save a RAM state from memory to disk.
*
*/
bool content_save_ram_file(unsigned slot)
{
ram_type_t ram;
retro_ctx_memory_info_t mem_info;
if (!content_get_memory(&mem_info, &ram, slot))
return false;
RARCH_LOG("%s #%u %s \"%s\".\n",
msg_hash_to_str(MSG_SAVING_RAM_TYPE),
ram.type,
msg_hash_to_str(MSG_TO),
ram.path);
if (!filestream_write_file(ram.path, mem_info.data, mem_info.size))
{
RARCH_ERR("%s.\n",
msg_hash_to_str(MSG_FAILED_TO_SAVE_SRAM));
RARCH_WARN("Attempting to recover ...\n");
/* In case the file could not be written to,
* the fallback function 'dump_to_file_desperate'
* will be called. */
if (!dump_to_file_desperate(mem_info.data, mem_info.size, ram.type))
{
RARCH_WARN("Failed ... Cannot recover save file.\n");
}
return false;
}
RARCH_LOG("%s \"%s\".\n",
msg_hash_to_str(MSG_SAVED_SUCCESSFULLY_TO),
ram.path);
return true;
}
bool event_save_files(void)
{
unsigned i;
global_t *global = global_get_ptr();
if (!global || !task_save_files || !global->sram.use)
return false;
for (i = 0; i < task_save_files->size; i++)
content_save_ram_file(i);
return true;
}
bool event_load_save_files(void)
{
unsigned i;
global_t *global = global_get_ptr();
if (!global)
return false;
if (!task_save_files || global->sram.load_disable)
return false;
for (i = 0; i < task_save_files->size; i++)
content_load_ram_file(i);
return true;
}
void path_init_savefile_rtc(void)
{
union string_list_elem_attr attr;
char savefile_name_rtc[PATH_MAX_LENGTH] = {0};
global_t *global = global_get_ptr();
attr.i = RETRO_MEMORY_SAVE_RAM;
string_list_append(task_save_files, global->name.savefile, attr);
/* Infer .rtc save path from save ram path. */
attr.i = RETRO_MEMORY_RTC;
fill_pathname(savefile_name_rtc,
global->name.savefile,
file_path_str(FILE_PATH_RTC_EXTENSION),
sizeof(savefile_name_rtc));
string_list_append(task_save_files, savefile_name_rtc, attr);
}
void path_deinit_savefile(void)
{
if (task_save_files)
string_list_free(task_save_files);
task_save_files = NULL;
}
void path_init_savefile_new(void)
{
task_save_files = string_list_new();
retro_assert(task_save_files);
}
void *savefile_ptr_get(void)
{
return task_save_files;
}
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