mirror of https://github.com/mpv-player/mpv
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/*
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* xbuffer code
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*
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* Includes a minimalistic replacement for xine_buffer functions used in
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* Real streaming code. Only function needed by this code are implemented.
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*
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* Most code comes from xine_buffer.c Copyright (C) 2002 the xine project
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*
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* WARNING: do not mix original xine_buffer functions with this code!
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* xbuffers behave like xine_buffers, but are not byte-compatible with them.
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* You must take care of pointers returned by xbuffers functions (no macro to
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* do it automatically)
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*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include "xbuffer.h"
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typedef struct {
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uint32_t size;
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uint32_t chunk_size;
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} xbuffer_header_t;
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#define XBUFFER_HEADER_SIZE sizeof (xbuffer_header_t)
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void *xbuffer_init(int chunk_size) {
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uint8_t *data=calloc(1,chunk_size+XBUFFER_HEADER_SIZE);
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xbuffer_header_t *header=(xbuffer_header_t*)data;
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header->size=chunk_size;
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header->chunk_size=chunk_size;
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return data+XBUFFER_HEADER_SIZE;
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}
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void *xbuffer_free(void *buf) {
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if (!buf) {
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return NULL;
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}
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free(((uint8_t*)buf)-XBUFFER_HEADER_SIZE);
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return NULL;
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}
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void *xbuffer_copyin(void *buf, int index, const void *data, int len) {
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if (!buf || !data) {
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return NULL;
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}
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buf = xbuffer_ensure_size(buf, index+len);
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memcpy(((uint8_t*)buf)+index, data, len);
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return buf;
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}
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void *xbuffer_ensure_size(void *buf, int size) {
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xbuffer_header_t *xbuf;
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int new_size;
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if (!buf) {
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return 0;
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}
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xbuf = ((xbuffer_header_t*)(((uint8_t*)buf)-XBUFFER_HEADER_SIZE));
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if (xbuf->size < size) {
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new_size = size + xbuf->chunk_size - (size % xbuf->chunk_size);
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xbuf->size = new_size;
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buf = ((uint8_t*)realloc(((uint8_t*)buf)-XBUFFER_HEADER_SIZE,
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new_size+XBUFFER_HEADER_SIZE)) + XBUFFER_HEADER_SIZE;
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}
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return buf;
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}
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void *xbuffer_strcat(void *buf, char *data) {
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if (!buf || !data) {
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return NULL;
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}
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buf = xbuffer_ensure_size(buf, strlen(buf)+strlen(data)+1);
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strcat(buf, data);
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return buf;
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}
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