/* * Copyright (c) 2012 Nicolas George * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with FFmpeg; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <string.h>#include "libavutil/avstring.h"#include "libavutil/base64.h"#include "url.h" typedef struct {    const uint8_t *data;    void *tofree;    size_t size;    size_t pos;} DataContext; static av_cold int data_open(URLContext *h, const char *uri, int flags){    DataContext *dc = h->priv_data;    const char *data, *opt, *next;    char *ddata;    int ret, base64 = 0;    size_t in_size;     /* data:content/type[;base64],payload */     av_strstart(uri, "data:", &uri);    data = strchr(uri, ',');    if (!data) {        av_log(h, AV_LOG_ERROR, "No ',' delimiter in URI\n");        return AVERROR(EINVAL);    }    opt = uri;    while (opt < data) {        next = av_x_if_null(memchr(opt, ';', data - opt), data);        if (opt == uri) {            if (!memchr(opt, '/', next - opt)) { /* basic validity check */                av_log(h, AV_LOG_ERROR, "Invalid content-type '%.*s'\n",                       (int)(next - opt), opt);                return AVERROR(EINVAL);            }            av_log(h, AV_LOG_VERBOSE, "Content-type: %.*s\n",                   (int)(next - opt), opt);        } else {            if (!av_strncasecmp(opt, "base64", next - opt)) {                base64 = 1;            } else {                av_log(h, AV_LOG_VERBOSE, "Ignoring option '%.*s'\n",                       (int)(next - opt), opt);            }        }        opt = next + 1;    }     data++;    in_size = strlen(data);    if (base64) {        size_t out_size = 3 * (in_size / 4) + 1;         if (out_size > INT_MAX || !(ddata = av_malloc(out_size)))            return AVERROR(ENOMEM);        if ((ret = av_base64_decode(ddata, data, out_size)) < 0) {            av_free(ddata);            av_log(h, AV_LOG_ERROR, "Invalid base64 in URI\n");            return ret;        }        dc->data = dc->tofree = ddata;        dc->size = ret;    } else {        dc->data = data;        dc->size = in_size;    }    return 0;} static av_cold int data_close(URLContext *h){    DataContext *dc = h->priv_data;     av_freep(&dc->tofree);    return 0;} static int data_read(URLContext *h, unsigned char *buf, int size){    DataContext *dc = h->priv_data;     if (dc->pos >= dc->size)        return AVERROR_EOF;    size = FFMIN(size, dc->size - dc->pos);    memcpy(buf, dc->data + dc->pos, size);    dc->pos += size;    return size;} const URLProtocol ff_data_protocol = {    .name           = "data",    .url_open       = data_open,    .url_close      = data_close,    .url_read       = data_read,    .priv_data_size = sizeof(DataContext),};