| /* |
| * 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; |
| } |
| |
| URLProtocol ff_data_protocol = { |
| .name = "data", |
| .url_open = data_open, |
| .url_close = data_close, |
| .url_read = data_read, |
| .priv_data_size = sizeof(DataContext), |
| }; |