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#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "serialize.h"
#include "util.h"
#ifndef SERIALIZE_DEFAULT_SIZE
#define SERIALIZE_DEFAULT_SIZE (256*1024) //default to enough for a Genesis save state
#endif
void init_serialize(serialize_buffer *buf)
{
buf->storage = SERIALIZE_DEFAULT_SIZE;
buf->size = 0;
buf->current_section_start = 0;
buf->data = malloc(SERIALIZE_DEFAULT_SIZE);
}
static void reserve(serialize_buffer *buf, size_t amount)
{
if (amount > (buf->storage - buf->size)) {
buf->storage *= 2;
buf = realloc(buf, buf->storage + sizeof(*buf));
}
}
void save_int32(serialize_buffer *buf, uint32_t val)
{
reserve(buf, sizeof(val));
buf->data[buf->size++] = val >> 24;
buf->data[buf->size++] = val >> 16;
buf->data[buf->size++] = val >> 8;
buf->data[buf->size++] = val;
}
void save_int16(serialize_buffer *buf, uint16_t val)
{
reserve(buf, sizeof(val));
buf->data[buf->size++] = val >> 8;
buf->data[buf->size++] = val;
}
void save_int8(serialize_buffer *buf, uint8_t val)
{
reserve(buf, sizeof(val));
buf->data[buf->size++] = val;
}
void save_string(serialize_buffer *buf, char *val)
{
size_t len = strlen(val);
save_buffer8(buf, val, len);
}
void save_buffer8(serialize_buffer *buf, void *val, size_t len)
{
reserve(buf, len);
memcpy(&buf->data[buf->size], val, len);
buf->size += len;
}
void save_buffer16(serialize_buffer *buf, uint16_t *val, size_t len)
{
reserve(buf, len * sizeof(*val));
for(; len != 0; len--, val++) {
buf->data[buf->size++] = *val >> 8;
buf->data[buf->size++] = *val;
}
}
void save_buffer32(serialize_buffer *buf, uint32_t *val, size_t len)
{
reserve(buf, len * sizeof(*val));
for(; len != 0; len--, val++) {
buf->data[buf->size++] = *val >> 24;
buf->data[buf->size++] = *val >> 16;
buf->data[buf->size++] = *val >> 8;
buf->data[buf->size++] = *val;
}
}
void start_section(serialize_buffer *buf, uint16_t section_id)
{
save_int16(buf, section_id);
//reserve some space for size once we end this section
reserve(buf, sizeof(uint32_t));
buf->size += sizeof(uint32_t);
//save start point for use in end_device
buf->current_section_start = buf->size;
}
void end_section(serialize_buffer *buf)
{
size_t section_size = buf->size - buf->current_section_start;
if (section_size > 0xFFFFFFFFU) {
fatal_error("Sections larger than 4GB are not supported");
}
uint32_t size = section_size;
uint8_t *field = buf->data + buf->current_section_start - sizeof(uint32_t);
*(field++) = size >> 24;
*(field++) = size >> 16;
*(field++) = size >> 8;
*(field++) = size;
buf->current_section_start = 0;
}
void register_section_handler(deserialize_buffer *buf, section_handler handler, uint16_t section_id)
{
if (section_id > buf->max_handler) {
uint16_t old_max = buf->max_handler;
if (buf->max_handler < 0x8000) {
buf->max_handler *= 2;
} else {
buf->max_handler = 0xFFFF;
}
buf->handlers = realloc(buf->handlers, (buf->max_handler+1) * sizeof(handler));
memset(buf->handlers + old_max + 1, 0, (buf->max_handler - old_max) * sizeof(handler));
}
if (!buf->handlers) {
buf->handlers = calloc(buf->max_handler + 1, sizeof(handler));
}
buf->handlers[section_id] = handler;
}
void init_deserialize(deserialize_buffer *buf, uint8_t *data, size_t size)
{
buf->size = size;
buf->cur_pos = 0;
buf->data = data;
buf->handlers = NULL;
buf->max_handler = 8;
}
uint32_t load_int32(deserialize_buffer *buf)
{
uint32_t val;
if ((buf->size - buf->cur_pos) < sizeof(val)) {
fatal_error("Failed to load required int32 field");
}
val = buf->data[buf->cur_pos++] << 24;
val |= buf->data[buf->cur_pos++] << 16;
val |= buf->data[buf->cur_pos++] << 8;
val |= buf->data[buf->cur_pos++];
return val;
}
uint16_t load_int16(deserialize_buffer *buf)
{
uint16_t val;
if ((buf->size - buf->cur_pos) < sizeof(val)) {
fatal_error("Failed to load required int16 field");
}
val = buf->data[buf->cur_pos++] << 8;
val |= buf->data[buf->cur_pos++];
return val;
}
uint8_t load_int8(deserialize_buffer *buf)
{
uint8_t val;
if ((buf->size - buf->cur_pos) < sizeof(val)) {
fatal_error("Failed to load required int8 field");
}
val = buf->data[buf->cur_pos++];
return val;
}
void load_buffer8(deserialize_buffer *buf, void *dst, size_t len)
{
if ((buf->size - buf->cur_pos) < len) {
fatal_error("Failed to load required buffer of size %d", len);
}
memcpy(dst, buf->data + buf->cur_pos, len);
buf->cur_pos += len;
}
void load_buffer16(deserialize_buffer *buf, uint16_t *dst, size_t len)
{
if ((buf->size - buf->cur_pos) < len * sizeof(uint16_t)) {
fatal_error("Failed to load required buffer of size %d\n", len);
}
for(; len != 0; len--, dst++) {
uint16_t value = buf->data[buf->cur_pos++] << 8;
value |= buf->data[buf->cur_pos++];
*dst = value;
}
}
void load_buffer32(deserialize_buffer *buf, uint32_t *dst, size_t len)
{
if ((buf->size - buf->cur_pos) < len * sizeof(uint32_t)) {
fatal_error("Failed to load required buffer of size %d\n", len);
}
for(; len != 0; len--, dst++) {
uint32_t value = buf->data[buf->cur_pos++] << 24;
value |= buf->data[buf->cur_pos++] << 16;
value |= buf->data[buf->cur_pos++] << 8;
value |= buf->data[buf->cur_pos++];
*dst = value;
}
}
void load_section(deserialize_buffer *buf)
{
if (!buf->handlers) {
fatal_error("load_section called on a deserialize_buffer with no handlers registered\n");
}
uint16_t section_id = load_int16(buf);
uint32_t size = load_int32(buf);
if (size > (buf->size - buf->cur_pos)) {
fatal_error("Section is bigger than remaining space in file");
}
if (section_id > buf->max_handler || !buf->handlers[section_id].fun) {
warning("No handler for section ID %d, save state may be from a newer version\n", section_id);
buf->cur_pos += size;
return;
}
deserialize_buffer section;
init_deserialize(§ion, buf->data + buf->cur_pos, size);
buf->handlers[section_id].fun(§ion, buf->handlers[section_id].data);
buf->cur_pos += size;
}
static const char sz_ident[] = "BLSTSZ\x01\x07";
uint8_t save_to_file(serialize_buffer *buf, char *path)
{
FILE *f = fopen(path, "wb");
if (!f) {
return 0;
}
if (fwrite(sz_ident, 1, sizeof(sz_ident)-1, f) != sizeof(sz_ident)-1) {
fclose(f);
return 0;
}
if (fwrite(buf->data, 1, buf->size, f) != buf->size) {
fclose(f);
return 0;
}
fclose(f);
return 1;
}
uint8_t load_from_file(deserialize_buffer *buf, char *path)
{
FILE *f = fopen(path, "rb");
if (!f) {
return 0;
}
char ident[sizeof(sz_ident)-1];
long size = file_size(f);
if (size < sizeof(ident)) {
fclose(f);
return 0;
}
if (fread(ident, 1, sizeof(ident), f) != sizeof(ident)) {
fclose(f);
return 0;
}
fclose(f);
if (memcmp(ident, sz_ident, sizeof(ident))) {
return 0;
}
buf->size = size - sizeof(ident);
buf->cur_pos = 0;
buf->data = malloc(buf->size);
buf->handlers = NULL;
buf->max_handler = 8;
if (fread(buf->data, 1, buf->size, f) != buf->size) {
free(buf->data);
buf->data = NULL;
buf->size = 0;
return 0;
}
return 1;
}
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