119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
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/*
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* Copyright (c) 2012 Nicolas George
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with FFmpeg; 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 <string.h>
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#include "libavutil/avstring.h"
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#include "libavutil/base64.h"
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#include "url.h"
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typedef struct {
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const uint8_t *data;
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void *tofree;
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size_t size;
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size_t pos;
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} DataContext;
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static av_cold int data_open(URLContext *h, const char *uri, int flags)
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{
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DataContext *dc = h->priv_data;
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const char *data, *opt, *next;
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char *ddata;
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int ret, base64 = 0;
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size_t in_size;
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/* data:content/type[;base64],payload */
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av_strstart(uri, "data:", &uri);
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data = strchr(uri, ',');
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if (!data) {
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av_log(h, AV_LOG_ERROR, "No ',' delimiter in URI\n");
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return AVERROR(EINVAL);
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}
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opt = uri;
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while (opt < data) {
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next = av_x_if_null(memchr(opt, ';', data - opt), data);
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if (opt == uri) {
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if (!memchr(opt, '/', next - opt)) { /* basic validity check */
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av_log(h, AV_LOG_ERROR, "Invalid content-type '%.*s'\n",
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(int)(next - opt), opt);
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return AVERROR(EINVAL);
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}
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av_log(h, AV_LOG_VERBOSE, "Content-type: %.*s\n",
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(int)(next - opt), opt);
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} else {
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if (!av_strncasecmp(opt, "base64", next - opt)) {
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base64 = 1;
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} else {
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av_log(h, AV_LOG_VERBOSE, "Ignoring option '%.*s'\n",
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(int)(next - opt), opt);
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}
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}
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opt = next + 1;
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}
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data++;
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in_size = strlen(data);
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if (base64) {
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size_t out_size = 3 * (in_size / 4) + 1;
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if (out_size > INT_MAX || !(ddata = av_malloc(out_size)))
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return AVERROR(ENOMEM);
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if ((ret = av_base64_decode(ddata, data, out_size)) < 0) {
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av_free(ddata);
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av_log(h, AV_LOG_ERROR, "Invalid base64 in URI\n");
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return ret;
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}
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dc->data = dc->tofree = ddata;
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dc->size = ret;
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} else {
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dc->data = data;
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dc->size = in_size;
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}
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return 0;
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}
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static av_cold int data_close(URLContext *h)
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{
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DataContext *dc = h->priv_data;
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av_freep(&dc->tofree);
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return 0;
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}
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static int data_read(URLContext *h, unsigned char *buf, int size)
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{
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DataContext *dc = h->priv_data;
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if (dc->pos >= dc->size)
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return AVERROR_EOF;
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size = FFMIN(size, dc->size - dc->pos);
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memcpy(buf, dc->data + dc->pos, size);
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dc->pos += size;
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return size;
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}
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const URLProtocol ff_data_protocol = {
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.name = "data",
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.url_open = data_open,
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.url_close = data_close,
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.url_read = data_read,
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.priv_data_size = sizeof(DataContext),
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};
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