lavf: add data: URI scheme.

1 files changed, 118 insertions, 0 deletions

diff --git a/libavformat/data_uri.c b/libavformat/data_uri.c
new file mode 100644
index 0000000000..1598b999ae
--- /dev/null
+++ b/libavformat/data_uri.c
@@ -0,0 +1,118 @@
+/*
+ * 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),
+};