added InputStream.ready

The flag "ready" indicates whether the input stream is ready and it
has parsed all meta data.  Previously, it was impossible for
decodeStart() to see the content type of HTTP input streams, because
at that time, the HTTP response wasn't parsed yet.

src/decode.c

@@ -53,6 +53,18 @@ static void decodeStart(void)
 	dc.state = DECODE_STATE_START;
 	dc.command = DECODE_COMMAND_NONE;
 
+	/* wait for the input stream to become ready; its metadata
+	   will be available then */
+
+	while (!inStream.ready) {
+		if (dc.command != DECODE_COMMAND_NONE)
+			goto stop;
+
+		ret = bufferInputStream(&inStream);
+		if (ret < 0)
+			goto stop;
+	}
+
 	/* for http streams, seekable is determined in bufferInputStream */
 	dc.seekable = inStream.seekable;
 

src/inputStream.c

@@ -31,6 +31,7 @@ void initInputStream(void)
 
 int openInputStream(InputStream * inStream, char *url)
 {
+	inStream->ready = 0;
 	inStream->offset = 0;
 	inStream->size = 0;
 	inStream->error = 0;

src/inputStream.h

@@ -32,6 +32,8 @@ typedef int (*InputStreamAtEOFFunc) (InputStream * inStream);
 typedef int (*InputStreamBufferFunc) (InputStream * inStream);
 
 struct _InputStream {
+	int ready;
+
 	int error;
 	long offset;
 	size_t size;

src/inputStream_file.c

@@ -52,6 +52,8 @@ int inputStream_fileOpen(InputStream * inStream, char *filename)
 	inStream->atEOFFunc = inputStream_fileAtEOF;
 	inStream->bufferFunc = inputStream_fileBuffer;
 
+	inStream->ready = 1;
+
 	return 0;
 }
 

src/inputStream_http.c

@@ -598,6 +598,7 @@ found:
 		xclose(data->fd);
 		data->fd = -1;
 		data->state = CONN_STATE_REDIRECT;
+		is->ready = 1;
 		return 0; /* success */
 	}
 	return -1;
@@ -696,6 +697,7 @@ static int recv_response(InputStream * is)
 
 	ringbuf_writer_reset(data->rb);
 	data->state = CONN_STATE_PREBUFFER;
+	is->ready = 1;
 
 	return 0;
 }