mirror of
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143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/* Copyright (C) 2010-2015 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (memory_stream.c).
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* ---------------------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge,
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* to any person obtaining a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <file/memory_stream.h>
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static uint8_t* g_buffer = NULL;
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static size_t g_size = 0;
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static size_t last_file_size = 0;
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struct memstream
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{
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uint8_t *m_buf;
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size_t m_size;
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size_t m_ptr;
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};
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void memstream_set_buffer(uint8_t *buffer, size_t size)
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{
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g_buffer = buffer;
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g_size = size;
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}
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size_t memstream_get_last_size(void)
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{
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return last_file_size;
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}
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static void memstream_init(memstream_t *stream, uint8_t *buffer, size_t max_size)
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{
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stream->m_buf = buffer;
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stream->m_size = max_size;
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stream->m_ptr = 0;
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}
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memstream_t *memstream_open(void)
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{
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memstream_t *stream;
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if (!g_buffer || !g_size)
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return NULL;
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stream = (memstream_t*)calloc(1, sizeof(*stream));
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memstream_init(stream, g_buffer, g_size);
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g_buffer = NULL;
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g_size = 0;
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return stream;
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}
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void memstream_close(memstream_t *stream)
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{
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last_file_size = stream->m_ptr;
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free(stream);
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}
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size_t memstream_read(memstream_t *stream, void *data, size_t bytes)
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{
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size_t avail = stream->m_size - stream->m_ptr;
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if (bytes > avail)
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bytes = avail;
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memcpy(data, stream->m_buf + stream->m_ptr, bytes);
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stream->m_ptr += bytes;
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return bytes;
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}
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size_t memstream_write(memstream_t *stream, const void *data, size_t bytes)
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{
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size_t avail = stream->m_size - stream->m_ptr;
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if (bytes > avail)
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bytes = avail;
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memcpy(stream->m_buf + stream->m_ptr, data, bytes);
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stream->m_ptr += bytes;
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return bytes;
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}
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int memstream_seek(memstream_t *stream, int offset, int whence)
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{
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size_t ptr;
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switch (whence)
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{
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case SEEK_SET:
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ptr = offset;
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break;
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case SEEK_CUR:
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ptr = stream->m_ptr + offset;
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break;
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case SEEK_END:
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ptr = stream->m_size + offset;
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break;
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default:
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return -1;
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}
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if (ptr <= stream->m_size)
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{
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stream->m_ptr = ptr;
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return 0;
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}
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return -1;
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}
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size_t memstream_pos(memstream_t *stream)
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{
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return stream->m_ptr;
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}
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char *memstream_gets(memstream_t *stream, char *buffer, size_t len)
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{
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return NULL;
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}
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int memstream_getc(memstream_t *stream)
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{
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if (stream->m_ptr >= stream->m_size)
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return EOF;
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return stream->m_buf[stream->m_ptr++];
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}
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