/* * 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), };