Add support for "chunked" data blocks. Patch by Peter Holik (peter holik at).

Originally committed as revision 19256 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/http.c

@@ -23,6 +23,7 @@
 #include "libavutil/avstring.h"
 #include "avformat.h"
 #include <unistd.h>
+#include <strings.h>
 #include "network.h"
 #include "os_support.h"
 
@@ -39,6 +40,7 @@ typedef struct {
     unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
     int line_count;
     int http_code;
+    int64_t chunksize;      /**< Used if "Transfer-Encoding: chunked" otherwise -1. */
     int64_t off, filesize;
     char location[URL_SIZE];
 } HTTPContext;
@@ -124,6 +126,7 @@ static int http_open(URLContext *h, const char *uri, int flags)
     }
     h->priv_data = s;
     s->filesize = -1;
+    s->chunksize = -1;
     s->off = 0;
     av_strlcpy(s->location, uri, URL_SIZE);
 
@@ -222,6 +225,9 @@ static int process_line(URLContext *h, char *line, int line_count,
                     s->filesize = atoll(slash+1);
             }
             h->is_streamed = 0; /* we _can_ in fact seek */
+        } else if (!strcmp (tag, "Transfer-Encoding") && !strncasecmp(p, "chunked", 7)) {
+            s->filesize = -1;
+            s->chunksize = 0;
         }
     }
     return 1;
@@ -296,6 +302,27 @@ static int http_read(URLContext *h, uint8_t *buf, int size)
     HTTPContext *s = h->priv_data;
     int len;
 
+    if (s->chunksize >= 0) {
+        if (!s->chunksize) {
+            char line[32];
+
+            for(;;) {
+                do {
+                    if (http_get_line(s, line, sizeof(line)) < 0)
+                        return AVERROR(EIO);
+                } while (!*line);    /* skip CR LF from last chunk */
+
+                s->chunksize = strtoll(line, NULL, 16);
+
+                dprintf(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize);
+
+                if (!s->chunksize)
+                    return 0;
+                break;
+            }
+        }
+        size = FFMIN(size, s->chunksize);
+    }
     /* read bytes from input buffer first */
     len = s->buf_end - s->buf_ptr;
     if (len > 0) {
@@ -306,8 +333,11 @@ static int http_read(URLContext *h, uint8_t *buf, int size)
     } else {
         len = url_read(s->hd, buf, size);
     }
-    if (len > 0)
+    if (len > 0) {
         s->off += len;
+        if (s->chunksize > 0)
+            s->chunksize -= len;
+    }
     return len;
 }