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/* Copyright (C) 2010-2020 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (memory_stream.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>
#include <streams/memory_stream.h>
/* TODO/FIXME - static globals */
static uint8_t* g_buffer = NULL;
static uint64_t g_size = 0;
static uint64_t last_file_size = 0;
struct memstream
{
uint64_t size;
uint64_t ptr;
uint64_t max_ptr;
uint8_t *buf;
unsigned writing;
};
void memstream_set_buffer(uint8_t *buffer, uint64_t size)
{
g_buffer = buffer;
g_size = size;
}
uint64_t memstream_get_last_size(void)
{
return last_file_size;
}
memstream_t *memstream_open(unsigned writing)
{
memstream_t *stream;
if (!g_buffer || !g_size)
return NULL;
stream = (memstream_t*)malloc(sizeof(*stream));
if (!stream)
return NULL;
stream->buf = g_buffer;
stream->size = g_size;
stream->ptr = 0;
stream->max_ptr = 0;
stream->writing = writing;
g_buffer = NULL;
g_size = 0;
return stream;
}
void memstream_close(memstream_t *stream)
{
if (!stream)
return;
last_file_size = stream->writing ? stream->max_ptr : stream->size;
free(stream);
}
uint64_t memstream_get_ptr(memstream_t *stream)
{
return stream->ptr;
}
uint64_t memstream_read(memstream_t *stream, void *data, uint64_t bytes)
{
uint64_t avail = 0;
if (!stream)
return 0;
avail = stream->size - stream->ptr;
if (bytes > avail)
bytes = avail;
memcpy(data, stream->buf + stream->ptr, (size_t)bytes);
stream->ptr += bytes;
if (stream->ptr > stream->max_ptr)
stream->max_ptr = stream->ptr;
return bytes;
}
uint64_t memstream_write(memstream_t *stream,
const void *data, uint64_t bytes)
{
uint64_t avail = 0;
if (!stream)
return 0;
avail = stream->size - stream->ptr;
if (bytes > avail)
bytes = avail;
memcpy(stream->buf + stream->ptr, data, (size_t)bytes);
stream->ptr += bytes;
if (stream->ptr > stream->max_ptr)
stream->max_ptr = stream->ptr;
return bytes;
}
int64_t memstream_seek(memstream_t *stream, int64_t offset, int whence)
{
uint64_t ptr;
switch (whence)
{
case SEEK_SET:
ptr = offset;
break;
case SEEK_CUR:
ptr = stream->ptr + offset;
break;
case SEEK_END:
ptr = (stream->writing ? stream->max_ptr : stream->size) + offset;
break;
default:
return -1;
}
if (ptr <= stream->size)
{
stream->ptr = ptr;
return 0;
}
return -1;
}
void memstream_rewind(memstream_t *stream)
{
memstream_seek(stream, 0L, SEEK_SET);
}
uint64_t memstream_pos(memstream_t *stream)
{
return stream->ptr;
}
char *memstream_gets(memstream_t *stream, char *buffer, size_t len)
{
return NULL;
}
int memstream_getc(memstream_t *stream)
{
int ret = 0;
if (stream->ptr >= stream->size)
return EOF;
ret = stream->buf[stream->ptr++];
if (stream->ptr > stream->max_ptr)
stream->max_ptr = stream->ptr;
return ret;
}
void memstream_putc(memstream_t *stream, int c)
{
if (stream->ptr < stream->size)
stream->buf[stream->ptr++] = c;
if (stream->ptr > stream->max_ptr)
stream->max_ptr = stream->ptr;
}
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