input_stream: convert offset and size to the off_t data type

size_t and long aren't 64 bit safe (i.e. files larger than 2 GB on a
32 bit OS).  Use off_t instead, which is a 64 bit integer if compiled
with large file support.

src/decoder/mp3_plugin.c

@@ -673,7 +673,7 @@ static int decodeFirstFrame(mp3DecodeData * data,
 	 * Attempt to calulcate the length of the song from filesize
 	 */
 	{
-		size_t offset = data->inStream->offset;
+		off_t offset = data->inStream->offset;
 		mad_timer_t duration = data->frame.header.duration;
 		float frameTime = ((float)mad_timer_count(duration,
 		                   MAD_UNITS_MILLISECONDS)) / 1000;

src/input_curl.c

@@ -414,8 +414,7 @@ input_curl_send_request(struct input_curl *c)
 }
 
 static bool
-input_curl_seek(struct input_stream *is, mpd_unused long offset,
-		mpd_unused int whence)
+input_curl_seek(struct input_stream *is, off_t offset, int whence)
 {
 	struct input_curl *c = is->data;
 	bool ret;
@@ -427,15 +426,15 @@ input_curl_seek(struct input_stream *is, mpd_unused long offset,
 
 	switch (whence) {
 	case SEEK_SET:
-		is->offset = (off_t)offset;
+		is->offset = offset;
 		break;
 
 	case SEEK_CUR:
-		is->offset += (off_t)offset;
+		is->offset += offset;
 		break;
 
 	case SEEK_END:
-		is->offset = (off_t)is->size + (off_t)offset;
+		is->offset = is->size + offset;
 		break;
 
 	default:
@@ -456,7 +455,7 @@ input_curl_seek(struct input_stream *is, mpd_unused long offset,
 	/* send the "Range" header */
 
 	if (is->offset > 0) {
-		c->range = g_strdup_printf("%ld-", is->offset); /* XXX 64 bit safety */
+		c->range = g_strdup_printf("%lld-", (long long)is->offset);
 		curl_easy_setopt(c->easy, CURLOPT_RANGE, c->range);
 	}
 

src/input_file.c

@@ -52,7 +52,7 @@ input_file_open(struct input_stream *is, const char *filename)
 }
 
 static bool
-input_file_seek(struct input_stream *is, long offset, int whence)
+input_file_seek(struct input_stream *is, off_t offset, int whence)
 {
 	if (fseek((FILE *) is->data, offset, whence) == 0) {
 		is->offset = ftell((FILE *) is->data);

src/input_stream.c

@@ -76,7 +76,7 @@ input_stream_open(struct input_stream *is, char *url)
 }
 
 bool
-input_stream_seek(struct input_stream *is, long offset, int whence)
+input_stream_seek(struct input_stream *is, off_t offset, int whence)
 {
 	return is->plugin->seek(is, offset, whence);
 }

src/input_stream.h

@@ -21,6 +21,7 @@
 
 #include <stddef.h>
 #include <stdbool.h>
+#include <sys/types.h>
 
 struct input_stream;
 
@@ -31,7 +32,7 @@ struct input_plugin {
 	int (*buffer)(struct input_stream *is);
 	size_t (*read)(struct input_stream *is, void *ptr, size_t size);
 	bool (*eof)(struct input_stream *is);
-	bool (*seek)(struct input_stream *is, long offset, int whence);
+	bool (*seek)(struct input_stream *is, off_t offset, int whence);
 };
 
 struct input_stream {
@@ -41,8 +42,7 @@ struct input_stream {
 	bool ready;
 
 	int error;
-	long offset;
-	size_t size;
+	off_t size, offset;
 	char *mime;
 
 	void *data;
@@ -60,7 +60,7 @@ bool
 input_stream_open(struct input_stream *is, char *url);
 
 bool
-input_stream_seek(struct input_stream *is, long offset, int whence);
+input_stream_seek(struct input_stream *is, off_t offset, int whence);
 
 void input_stream_close(struct input_stream *is);
 bool input_stream_eof(struct input_stream *is);