http: Refactor process_line

(cherry picked from commit 4ff99ab3d7d5576e99e6b8a411b4a44500ed88fa)

1 files changed, 85 insertions, 51 deletions

diff --git a/libavformat/http.c b/libavformat/http.c
index ba0cf574ab..161bb6bf49 100644
--- a/libavformat/http.c
+++ b/libavformat/http.c
@@ -303,11 +303,89 @@ static int http_get_line(HTTPContext *s, char *line, int line_size)
     }
 }
 
+static int check_http_code(URLContext *h, int http_code, const char *end)
+{
+    HTTPContext *s = h->priv_data;
+    /* error codes are 4xx and 5xx, but regard 401 as a success, so we
+     * don't abort until all headers have been parsed. */
+    if (http_code >= 400 && http_code < 600 &&
+        (http_code != 401 || s->auth_state.auth_type != HTTP_AUTH_NONE) &&
+        (http_code != 407 || s->proxy_auth_state.auth_type != HTTP_AUTH_NONE)) {
+        end += strspn(end, SPACE_CHARS);
+        av_log(h, AV_LOG_WARNING, "HTTP error %d %s\n", http_code, end);
+        return AVERROR(EIO);
+    }
+    return 0;
+}
+
+static int parse_location(HTTPContext *s, const char *p)
+{
+    char redirected_location[MAX_URL_SIZE], *new_loc;
+    ff_make_absolute_url(redirected_location, sizeof(redirected_location),
+                         s->location, p);
+    new_loc = av_strdup(redirected_location);
+    if (!new_loc)
+        return AVERROR(ENOMEM);
+    av_free(s->location);
+    s->location = new_loc;
+    return 0;
+}
+
+/* "bytes $from-$to/$document_size" */
+static void parse_content_range(URLContext *h, char *p)
+{
+    HTTPContext *s = h->priv_data;
+    const char *slash;
+
+    if (!strncmp(p, "bytes ", 6)) {
+        p += 6;
+        s->off = strtoll(p, NULL, 10);
+        if ((slash = strchr(p, '/')) && strlen(slash) > 0)
+            s->filesize = strtoll(slash+1, NULL, 10);
+    }
+    h->is_streamed = 0; /* we _can_ in fact seek */
+}
+
+static int parse_content_encoding(URLContext *h, char *p)
+{
+    HTTPContext *s = h->priv_data;
+
+    if (!av_strncasecmp(p, "gzip", 4) ||
+        !av_strncasecmp(p, "deflate", 7)) {
+#if CONFIG_ZLIB
+        s->compressed = 1;
+        inflateEnd(&s->inflate_stream);
+        if (inflateInit2(&s->inflate_stream, 32 + 15) != Z_OK) {
+            av_log(h, AV_LOG_WARNING, "Error during zlib initialisation: %s\n",
+                   s->inflate_stream.msg);
+            return AVERROR(ENOSYS);
+        }
+        if (zlibCompileFlags() & (1 << 17)) {
+            av_log(h, AV_LOG_WARNING,
+                   "Your zlib was compiled without gzip support.\n");
+            return AVERROR(ENOSYS);
+        }
+#else
+        av_log(h, AV_LOG_WARNING,
+               "Compressed (%s) content, need zlib with gzip support\n", p);
+        return AVERROR(ENOSYS);
+#endif
+    } else if (!av_strncasecmp(p, "identity", 8)) {
+        // The normal, no-encoding case (although servers shouldn't include
+        // the header at all if this is the case).
+    } else {
+        av_log(h, AV_LOG_WARNING, "Unknown content coding: %s\n", p);
+        return AVERROR(ENOSYS);
+    }
+    return 0;
+}
+
 static int process_line(URLContext *h, char *line, int line_count,
                         int *new_location)
 {
     HTTPContext *s = h->priv_data;
     char *tag, *p, *end;
+    int ret;
 
     /* end of header */
     if (line[0] == '\0') {
@@ -325,15 +403,8 @@ static int process_line(URLContext *h, char *line, int line_count,
 
         av_dlog(NULL, "http_code=%d\n", s->http_code);
 
-        /* error codes are 4xx and 5xx, but regard 401 as a success, so we
-         * don't abort until all headers have been parsed. */
-        if (s->http_code >= 400 && s->http_code < 600 &&
-            (s->http_code != 401 || s->auth_state.auth_type != HTTP_AUTH_NONE) &&
-            (s->http_code != 407 || s->proxy_auth_state.auth_type != HTTP_AUTH_NONE)) {
-            end += strspn(end, SPACE_CHARS);
-            av_log(h, AV_LOG_WARNING, "HTTP error %d %s\n", s->http_code, end);
-            return AVERROR(EIO);
-        }
+        if ((ret = check_http_code(h, s->http_code, end)) < 0)
+            return ret;
     } else {
         while (*p != '\0' && *p != ':')
             p++;
@@ -346,27 +417,13 @@ static int process_line(URLContext *h, char *line, int line_count,
         while (av_isspace(*p))
             p++;
         if (!av_strcasecmp(tag, "Location")) {
-            char redirected_location[MAX_URL_SIZE], *new_loc;
-            ff_make_absolute_url(redirected_location, sizeof(redirected_location),
-                                 s->location, p);
-            new_loc = av_strdup(redirected_location);
-            if (!new_loc)
-                return AVERROR(ENOMEM);
-            av_free(s->location);
-            s->location = new_loc;
+            if ((ret = parse_location(s, p)) < 0)
+                return ret;
             *new_location = 1;
         } else if (!av_strcasecmp(tag, "Content-Length") && s->filesize == -1) {
             s->filesize = strtoll(p, NULL, 10);
         } else if (!av_strcasecmp(tag, "Content-Range")) {
-            /* "bytes $from-$to/$document_size" */
-            const char *slash;
-            if (!strncmp(p, "bytes ", 6)) {
-                p += 6;
-                s->off = strtoll(p, NULL, 10);
-                if ((slash = strchr(p, '/')) && strlen(slash) > 0)
-                    s->filesize = strtoll(slash+1, NULL, 10);
-            }
-            h->is_streamed = 0; /* we _can_ in fact seek */
+            parse_content_range(h, p);
         } else if (!av_strcasecmp(tag, "Accept-Ranges") &&
                    !strncmp(p, "bytes", 5)) {
             h->is_streamed = 0;
@@ -384,31 +441,8 @@ static int process_line(URLContext *h, char *line, int line_count,
             if (!strcmp(p, "close"))
                 s->willclose = 1;
         } else if (!av_strcasecmp(tag, "Content-Encoding")) {
-            if (!av_strncasecmp(p, "gzip", 4) ||
-                !av_strncasecmp(p, "deflate", 7)) {
-#if CONFIG_ZLIB
-                s->compressed = 1;
-                inflateEnd(&s->inflate_stream);
-                if (inflateInit2(&s->inflate_stream, 32 + 15) != Z_OK) {
-                    av_log(h, AV_LOG_WARNING, "Error during zlib initialisation: %s\n",
-                           s->inflate_stream.msg);
-                    return AVERROR(ENOSYS);
-                }
-                if (zlibCompileFlags() & (1 << 17)) {
-                    av_log(h, AV_LOG_WARNING, "Your zlib was compiled without gzip support.\n");
-                    return AVERROR(ENOSYS);
-                }
-#else
-                av_log(h, AV_LOG_WARNING, "Compressed (%s) content, need zlib with gzip support\n", p);
-                return AVERROR(ENOSYS);
-#endif
-            } else if (!av_strncasecmp(p, "identity", 8)) {
-                // The normal, no-encoding case (although servers shouldn't include
-                // the header at all if this is the case).
-            } else {
-                av_log(h, AV_LOG_WARNING, "Unknown content coding: %s\n", p);
-                return AVERROR(ENOSYS);
-            }
+            if ((ret = parse_content_encoding(h, p)) < 0)
+                return ret;
         }
     }
     return 1;