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Presize the download buffer when we see the Content-Length header;

this saves around 70us per received packet (which is around 50% of the
overall packet processing time).
tags/v0.9.3
Michael Brown 18 år sedan
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6c72bf13a1
1 ändrade filer med 12 tillägg och 0 borttagningar
  1. 12
    0
      src/net/tcp/http.c

+ 12
- 0
src/net/tcp/http.c Visa fil

@@ -139,6 +139,7 @@ static void http_rx_response ( struct http_request *http, char *response ) {
139 139
 static int http_rx_content_length ( struct http_request *http,
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 				    const char *value ) {
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 	char *endp;
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+	int rc;
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 	http->content_length = strtoul ( value, &endp, 10 );
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 	if ( *endp != '\0' ) {
@@ -147,6 +148,15 @@ static int http_rx_content_length ( struct http_request *http,
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 		return -EIO;
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 	}
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+	/* Try to presize the receive buffer */
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+	if ( ( rc = expand_buffer ( http->buffer,
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+				    http->content_length ) ) != 0 ) {
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+		/* May as well abandon the download now; it will fail */
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+		DBGC ( http, "HTTP %p could not presize buffer: %s\n",
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+		       http, strerror ( rc ) );
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+		return rc;
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+	}
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+
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 	return 0;
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 }
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@@ -162,6 +172,8 @@ struct http_header_handler {
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 	 * @v http	HTTP request
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 	 * @v value	HTTP header value
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 	 * @ret rc	Return status code
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+	 *
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+	 * If an error is returned, the download will be aborted.
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 	 */
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 	int ( * rx ) ( struct http_request *http, const char *value );
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 };

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