InputStream: use int64_t instead of goffset

Decouple some more from GLib.

20 files changed, 78 insertions, 64 deletions

diff --git a/src/InputPlugin.hxx b/src/InputPlugin.hxx
index f6976bf8d..134207584 100644
--- a/src/InputPlugin.hxx
+++ b/src/InputPlugin.hxx
@@ -23,9 +23,8 @@
 #include "thread/Mutex.hxx"
 #include "thread/Cond.hxx"
 
-#include <glib.h>
-
 #include <stddef.h>
+#include <stdint.h>
 
 struct config_param;
 struct input_stream;
@@ -33,6 +32,8 @@ class Error;
 struct Tag;
 
 struct InputPlugin {
+	typedef int64_t offset_type;
+
 	const char *name;
 
 	/**
@@ -85,7 +86,7 @@ struct InputPlugin {
 	size_t (*read)(struct input_stream *is, void *ptr, size_t size,
 		       Error &error);
 	bool (*eof)(struct input_stream *is);
-	bool (*seek)(struct input_stream *is, goffset offset, int whence,
+	bool (*seek)(struct input_stream *is, offset_type offset, int whence,
 		     Error &error);
 };
 
diff --git a/src/InputStream.cxx b/src/InputStream.cxx
index 8a9f6c66d..23e535d15 100644
--- a/src/InputStream.cxx
+++ b/src/InputStream.cxx
@@ -95,7 +95,7 @@ input_stream::CheapSeeking() const
 }
 
 bool
-input_stream::Seek(goffset _offset, int whence, Error &error)
+input_stream::Seek(offset_type _offset, int whence, Error &error)
 {
 	if (plugin.seek == nullptr)
 		return false;
@@ -104,7 +104,7 @@ input_stream::Seek(goffset _offset, int whence, Error &error)
 }
 
 bool
-input_stream::LockSeek(goffset _offset, int whence, Error &error)
+input_stream::LockSeek(offset_type _offset, int whence, Error &error)
 {
 	if (plugin.seek == nullptr)
 		return false;
diff --git a/src/InputStream.hxx b/src/InputStream.hxx
index 51f32deec..2a3d7b2cd 100644
--- a/src/InputStream.hxx
+++ b/src/InputStream.hxx
@@ -26,9 +26,8 @@
 
 #include <string>
 
-#include <glib.h>
-
 #include <assert.h>
+#include <stdint.h>
 
 class Cond;
 class Error;
@@ -36,6 +35,8 @@ struct Tag;
 struct InputPlugin;
 
 struct input_stream {
+	typedef int64_t offset_type;
+
 	/**
 	 * the plugin which implements this input stream
 	 */
@@ -80,12 +81,12 @@ struct input_stream {
 	/**
 	 * the size of the resource, or -1 if unknown
 	 */
-	goffset size;
+	offset_type size;
 
 	/**
 	 * the current offset within the stream
 	 */
-	goffset offset;
+	offset_type offset;
 
 	/**
 	 * the MIME content type of the resource, or empty if unknown.
@@ -173,14 +174,14 @@ struct input_stream {
 	}
 
 	gcc_pure
-	goffset GetSize() const {
+	offset_type GetSize() const {
 		assert(ready);
 
 		return size;
 	}
 
 	gcc_pure
-	goffset GetOffset() const {
+	offset_type GetOffset() const {
 		assert(ready);
 
 		return offset;
@@ -208,13 +209,13 @@ struct input_stream {
 	 * @param offset the relative offset
 	 * @param whence the base of the seek, one of SEEK_SET, SEEK_CUR, SEEK_END
 	 */
-	bool Seek(goffset offset, int whence, Error &error);
+	bool Seek(offset_type offset, int whence, Error &error);
 
 	/**
 	 * Wrapper for Seek() which locks and unlocks the mutex; the
 	 * caller must not be holding it already.
 	 */
-	bool LockSeek(goffset offset, int whence, Error &error);
+	bool LockSeek(offset_type offset, int whence, Error &error);
 
 	/**
 	 * Returns true if the stream has reached end-of-file.
diff --git a/src/PlaylistPrint.cxx b/src/PlaylistPrint.cxx
index 791a600c5..0a9b5c4bc 100644
--- a/src/PlaylistPrint.cxx
+++ b/src/PlaylistPrint.cxx
@@ -36,6 +36,8 @@
 #include "util/Error.hxx"
 #include "thread/Cond.hxx"
 
+#include <glib.h>
+
 void
 playlist_print_uris(Client *client, const struct playlist *playlist)
 {
diff --git a/src/PlaylistQueue.cxx b/src/PlaylistQueue.cxx
index 183237b5f..28a1ff22d 100644
--- a/src/PlaylistQueue.cxx
+++ b/src/PlaylistQueue.cxx
@@ -28,6 +28,8 @@
 #include "Song.hxx"
 #include "thread/Cond.hxx"
 
+#include <glib.h>
+
 enum playlist_result
 playlist_load_into_queue(const char *uri, SongEnumerator &e,
 			 unsigned start_index, unsigned end_index,
diff --git a/src/PlaylistRegistry.cxx b/src/PlaylistRegistry.cxx
index 2a4cf8c5d..f18f7c5e9 100644
--- a/src/PlaylistRegistry.cxx
+++ b/src/PlaylistRegistry.cxx
@@ -40,6 +40,8 @@
 #include "system/FatalError.hxx"
 #include "Log.hxx"
 
+#include <glib.h>
+
 #include <assert.h>
 #include <string.h>
 #include <stdio.h>
diff --git a/src/archive/ZzipArchivePlugin.cxx b/src/archive/ZzipArchivePlugin.cxx
index ebac331b5..35730d078 100644
--- a/src/archive/ZzipArchivePlugin.cxx
+++ b/src/archive/ZzipArchivePlugin.cxx
@@ -178,12 +178,12 @@ zzip_input_eof(struct input_stream *is)
 {
 	ZzipInputStream *zis = (ZzipInputStream *)is;
 
-	return (goffset)zzip_tell(zis->file) == is->size;
+	return (InputPlugin::offset_type)zzip_tell(zis->file) == is->size;
 }
 
 static bool
-zzip_input_seek(struct input_stream *is,
-		goffset offset, int whence, Error &error)
+zzip_input_seek(struct input_stream *is, InputPlugin::offset_type offset,
+		int whence, Error &error)
 {
 	ZzipInputStream *zis = (ZzipInputStream *)is;
 	zzip_off_t ofs = zzip_seek(zis->file, offset, whence);
diff --git a/src/decoder/DsdLib.cxx b/src/decoder/DsdLib.cxx
index 7135c9903..491b158e6 100644
--- a/src/decoder/DsdLib.cxx
+++ b/src/decoder/DsdLib.cxx
@@ -63,7 +63,7 @@ dsdlib_read(struct decoder *decoder, struct input_stream *is,
  */
 bool
 dsdlib_skip_to(struct decoder *decoder, struct input_stream *is,
-	       goffset offset)
+	       int64_t offset)
 {
 	if (is->IsSeekable())
 		return is->Seek(offset, SEEK_SET, IgnoreError());
@@ -74,7 +74,7 @@ dsdlib_skip_to(struct decoder *decoder, struct input_stream *is,
 	char buffer[8192];
 	while (is->GetOffset() < offset) {
 		size_t length = sizeof(buffer);
-		if (offset - is->GetOffset() < (goffset)length)
+		if (offset - is->GetOffset() < (int64_t)length)
 			length = offset - is->GetOffset();
 
 		size_t nbytes = decoder_read(decoder, is, buffer, length);
@@ -91,7 +91,7 @@ dsdlib_skip_to(struct decoder *decoder, struct input_stream *is,
  */
 bool
 dsdlib_skip(struct decoder *decoder, struct input_stream *is,
-	    goffset delta)
+	    int64_t delta)
 {
 	assert(delta >= 0);
 
@@ -104,7 +104,7 @@ dsdlib_skip(struct decoder *decoder, struct input_stream *is,
 	char buffer[8192];
 	while (delta > 0) {
 		size_t length = sizeof(buffer);
-		if ((goffset)length > delta)
+		if ((int64_t)length > delta)
 			length = delta;
 
 		size_t nbytes = decoder_read(decoder, is, buffer, length);
@@ -126,7 +126,7 @@ dsdlib_skip(struct decoder *decoder, struct input_stream *is,
 void
 dsdlib_tag_id3(struct input_stream *is,
 	       const struct tag_handler *handler,
-	       void *handler_ctx, goffset tagoffset)
+	       void *handler_ctx, int64_t tagoffset)
 {
 	assert(tagoffset >= 0);
 
@@ -140,8 +140,8 @@ dsdlib_tag_id3(struct input_stream *is,
 	id3_length_t count;
 
 	/* Prevent broken files causing problems */
-	const goffset size = is->GetSize();
-	const goffset offset = is->GetOffset();
+	const auto size = is->GetSize();
+	const auto offset = is->GetOffset();
 	if (offset >= size)
 		return;
 
diff --git a/src/decoder/DsdLib.hxx b/src/decoder/DsdLib.hxx
index 2a8e15190..b1c708fca 100644
--- a/src/decoder/DsdLib.hxx
+++ b/src/decoder/DsdLib.hxx
@@ -21,8 +21,7 @@
 #define MPD_DECODER_DSDLIB_HXX
 
 #include <stdlib.h>
-
-#include <glib.h>
+#include <stdint.h>
 
 struct dsdlib_id {
 	char value[4];
@@ -37,15 +36,15 @@ dsdlib_read(struct decoder *decoder, struct input_stream *is,
 
 bool
 dsdlib_skip_to(struct decoder *decoder, struct input_stream *is,
-	       goffset offset);
+	       int64_t offset);
 
 bool
 dsdlib_skip(struct decoder *decoder, struct input_stream *is,
-	    goffset delta);
+	    int64_t delta);
 
 void
 dsdlib_tag_id3(struct input_stream *is,
 	       const struct tag_handler *handler,
-	       void *handler_ctx, goffset tagoffset);
+	       void *handler_ctx, int64_t tagoffset);
 
 #endif
diff --git a/src/decoder/DsdiffDecoderPlugin.cxx b/src/decoder/DsdiffDecoderPlugin.cxx
index c4150dd91..93002509f 100644
--- a/src/decoder/DsdiffDecoderPlugin.cxx
+++ b/src/decoder/DsdiffDecoderPlugin.cxx
@@ -72,13 +72,13 @@ struct DsdiffMetaData {
 	bool bitreverse;
 	uint64_t chunk_size;
 #ifdef HAVE_ID3TAG
-	goffset id3_offset;
+	input_stream::offset_type id3_offset;
 	uint64_t id3_size;
 #endif
 	/** offset for artist tag */
-	goffset diar_offset;
+	input_stream::offset_type diar_offset;
 	/** offset for title tag */
-	goffset diti_offset;
+	input_stream::offset_type diti_offset;
 };
 
 static bool lsbitfirst;
@@ -123,14 +123,14 @@ dsdiff_read_payload(struct decoder *decoder, struct input_stream *is,
 static bool
 dsdiff_read_prop_snd(struct decoder *decoder, struct input_stream *is,
 		     DsdiffMetaData *metadata,
-		     goffset end_offset)
+		     input_stream::offset_type end_offset)
 {
 	DsdiffChunkHeader header;
-	while ((goffset)(is->GetOffset() + sizeof(header)) <= end_offset) {
+	while ((input_stream::offset_type)(is->GetOffset() + sizeof(header)) <= end_offset) {
 		if (!dsdiff_read_chunk_header(decoder, is, &header))
 			return false;
 
-		goffset chunk_end_offset = is->GetOffset()
+		input_stream::offset_type chunk_end_offset = is->GetOffset()
 			+ header.GetSize();
 		if (chunk_end_offset > end_offset)
 			return false;
@@ -184,7 +184,7 @@ dsdiff_read_prop(struct decoder *decoder, struct input_stream *is,
 		 const DsdiffChunkHeader *prop_header)
 {
 	uint64_t prop_size = prop_header->GetSize();
-	goffset end_offset = is->GetOffset() + prop_size;
+	input_stream::offset_type end_offset = is->GetOffset() + prop_size;
 
 	struct dsdlib_id prop_id;
 	if (prop_size < sizeof(prop_id) ||
@@ -201,7 +201,7 @@ dsdiff_read_prop(struct decoder *decoder, struct input_stream *is,
 static void
 dsdiff_handle_native_tag(struct input_stream *is,
 			 const struct tag_handler *handler,
-			 void *handler_ctx, goffset tagoffset,
+			 void *handler_ctx, input_stream::offset_type tagoffset,
 			 enum tag_type type)
 {
 	if (!dsdlib_skip_to(nullptr, is, tagoffset))
@@ -259,7 +259,7 @@ dsdiff_read_metadata_extra(struct decoder *decoder, struct input_stream *is,
 	/* Now process all the remaining chunk headers in the stream
 	   and record their position and size */
 
-	const goffset size = is->GetSize();
+	const auto size = is->GetSize();
 	while (is->GetOffset() < size) {
 		uint64_t chunk_size = chunk_header->GetSize();
 
@@ -351,8 +351,8 @@ dsdiff_read_metadata(struct decoder *decoder, struct input_stream *is,
 		} else {
 			/* ignore unknown chunk */
 			const uint64_t chunk_size = chunk_header->GetSize();
-			goffset chunk_end_offset = is->GetOffset()
-				+ chunk_size;
+			input_stream::offset_type chunk_end_offset =
+				is->GetOffset() + chunk_size;
 
 			if (!dsdlib_skip_to(decoder, is, chunk_end_offset))
 				return false;
diff --git a/src/decoder/DsfDecoderPlugin.cxx b/src/decoder/DsfDecoderPlugin.cxx
index 28004e8b7..95735d8c6 100644
--- a/src/decoder/DsfDecoderPlugin.cxx
+++ b/src/decoder/DsfDecoderPlugin.cxx
@@ -47,7 +47,7 @@ struct DsfMetaData {
 	bool bitreverse;
 	uint64_t chunk_size;
 #ifdef HAVE_ID3TAG
-	goffset id3_offset;
+	input_stream::offset_type id3_offset;
 	uint64_t id3_size;
 #endif
 };
@@ -176,7 +176,7 @@ dsf_read_metadata(struct decoder *decoder, struct input_stream *is,
 	if (metadata_offset >= size)
 		metadata->id3_offset = 0;
 	else
-		metadata->id3_offset = (goffset) metadata_offset;
+		metadata->id3_offset = (input_stream::offset_type)metadata_offset;
 #endif
 	/* check bits per sample format, determine if bitreverse is needed */
 	metadata->bitreverse = dsf_fmt_chunk.bitssample == 1;
diff --git a/src/decoder/FaadDecoderPlugin.cxx b/src/decoder/FaadDecoderPlugin.cxx
index de846c61a..077b3ccf2 100644
--- a/src/decoder/FaadDecoderPlugin.cxx
+++ b/src/decoder/FaadDecoderPlugin.cxx
@@ -170,7 +170,7 @@ faad_song_duration(DecoderBuffer *buffer, struct input_stream *is)
 	size_t length;
 	bool success;
 
-	const goffset size = is->GetSize();
+	const auto size = is->GetSize();
 	fileread = size >= 0 ? size : 0;
 
 	decoder_buffer_fill(buffer);
diff --git a/src/decoder/MadDecoderPlugin.cxx b/src/decoder/MadDecoderPlugin.cxx
index 1cce24f31..a6c53bfb6 100644
--- a/src/decoder/MadDecoderPlugin.cxx
+++ b/src/decoder/MadDecoderPlugin.cxx
@@ -152,10 +152,10 @@ struct MadDecoder {
 	enum mp3_action DecodeNextFrame();
 
 	gcc_pure
-	goffset ThisFrameOffset() const;
+	input_stream::offset_type ThisFrameOffset() const;
 
 	gcc_pure
-	goffset RestIncludingThisFrame() const;
+	input_stream::offset_type RestIncludingThisFrame() const;
 
 	/**
 	 * Attempt to calulcate the length of the song from filesize
@@ -776,10 +776,10 @@ mp3_frame_duration(const struct mad_frame *frame)
 			       MAD_UNITS_MILLISECONDS) / 1000.0;
 }
 
-inline goffset
+inline input_stream::offset_type
 MadDecoder::ThisFrameOffset() const
 {
-	goffset offset = input_stream->GetOffset();
+	auto offset = input_stream->GetOffset();
 
 	if (stream.this_frame != nullptr)
 		offset -= stream.bufend - stream.this_frame;
@@ -789,7 +789,7 @@ MadDecoder::ThisFrameOffset() const
 	return offset;
 }
 
-inline goffset
+inline input_stream::offset_type
 MadDecoder::RestIncludingThisFrame() const
 {
 	return input_stream->GetSize() - ThisFrameOffset();
@@ -798,7 +798,7 @@ MadDecoder::RestIncludingThisFrame() const
 inline void
 MadDecoder::FileSizeToSongLength()
 {
-	goffset rest = RestIncludingThisFrame();
+	input_stream::offset_type rest = RestIncludingThisFrame();
 
 	if (rest > 0) {
 		float frame_duration = mp3_frame_duration(&frame);
diff --git a/src/decoder/ModplugDecoderPlugin.cxx b/src/decoder/ModplugDecoderPlugin.cxx
index 39c366492..685675350 100644
--- a/src/decoder/ModplugDecoderPlugin.cxx
+++ b/src/decoder/ModplugDecoderPlugin.cxx
@@ -36,12 +36,12 @@ static constexpr Domain modplug_domain("modplug");
 static constexpr size_t MODPLUG_FRAME_SIZE = 4096;
 static constexpr size_t MODPLUG_PREALLOC_BLOCK = 256 * 1024;
 static constexpr size_t MODPLUG_READ_BLOCK = 128 * 1024;
-static constexpr goffset MODPLUG_FILE_LIMIT = 100 * 1024 * 1024;
+static constexpr input_stream::offset_type MODPLUG_FILE_LIMIT = 100 * 1024 * 1024;
 
 static GByteArray *
 mod_loadfile(struct decoder *decoder, struct input_stream *is)
 {
-	const goffset size = is->GetSize();
+	const input_stream::offset_type size = is->GetSize();
 
 	if (size == 0) {
 		LogWarning(modplug_domain, "file is empty");
@@ -77,7 +77,7 @@ mod_loadfile(struct decoder *decoder, struct input_stream *is)
 			return nullptr;
 		}
 
-		if (goffset(bdatas->len + ret) > MODPLUG_FILE_LIMIT) {
+		if (input_stream::offset_type(bdatas->len + ret) > MODPLUG_FILE_LIMIT) {
 			LogWarning(modplug_domain, "stream too large");
 			g_free(data);
 			g_byte_array_free(bdatas, TRUE);
diff --git a/src/decoder/PcmDecoderPlugin.cxx b/src/decoder/PcmDecoderPlugin.cxx
index 61062f7f9..874fb5b89 100644
--- a/src/decoder/PcmDecoderPlugin.cxx
+++ b/src/decoder/PcmDecoderPlugin.cxx
@@ -46,7 +46,7 @@ pcm_stream_decode(struct decoder *decoder, struct input_stream *is)
 	const double time_to_size = audio_format.GetTimeToSize();
 
 	float total_time = -1;
-	const goffset size = is->GetSize();
+	const auto size = is->GetSize();
 	if (size >= 0)
 		total_time = size / time_to_size;
 
@@ -74,8 +74,8 @@ pcm_stream_decode(struct decoder *decoder, struct input_stream *is)
 				       buffer, nbytes, 0)
 			: decoder_get_command(decoder);
 		if (cmd == DecoderCommand::SEEK) {
-			goffset offset = (goffset)(time_to_size *
-						   decoder_seek_where(decoder));
+			input_stream::offset_type offset(time_to_size *
+							 decoder_seek_where(decoder));
 
 			Error error;
 			if (is->LockSeek(offset, SEEK_SET, error)) {
diff --git a/src/input/CdioParanoiaInputPlugin.cxx b/src/input/CdioParanoiaInputPlugin.cxx
index d441ed818..654a6dc4a 100644
--- a/src/input/CdioParanoiaInputPlugin.cxx
+++ b/src/input/CdioParanoiaInputPlugin.cxx
@@ -250,7 +250,7 @@ input_cdio_open(const char *uri,
 
 static bool
 input_cdio_seek(struct input_stream *is,
-		goffset offset, int whence, Error &error)
+		InputPlugin::offset_type offset, int whence, Error &error)
 {
 	CdioParanoiaInputStream *cis = (CdioParanoiaInputStream *)is;
 
diff --git a/src/input/CurlInputPlugin.cxx b/src/input/CurlInputPlugin.cxx
index 5a89fc1fd..6f11153ec 100644
--- a/src/input/CurlInputPlugin.cxx
+++ b/src/input/CurlInputPlugin.cxx
@@ -780,7 +780,7 @@ input_curl_read(struct input_stream *is, void *ptr, size_t size,
 	if (c->icy.IsDefined())
 		copy_icy_tag(c);
 
-	is->offset += (goffset)nbytes;
+	is->offset += (InputPlugin::offset_type)nbytes;
 
 	if (c->paused && curl_total_buffer_size(c) < CURL_RESUME_AT) {
 		c->base.mutex.unlock();
@@ -977,7 +977,8 @@ input_curl_easy_init(struct input_curl *c, Error &error)
 }
 
 static bool
-input_curl_seek(struct input_stream *is, goffset offset, int whence,
+input_curl_seek(struct input_stream *is, InputPlugin::offset_type offset,
+		int whence,
 		Error &error)
 {
 	struct input_curl *c = (struct input_curl *)is;
@@ -1022,7 +1023,7 @@ input_curl_seek(struct input_stream *is, goffset offset, int whence,
 	while (offset > is->offset && !c->buffers.empty()) {
 		auto &buffer = c->buffers.front();
 		size_t length = buffer.Available();
-		if (offset - is->offset < (goffset)length)
+		if (offset - is->offset < (InputPlugin::offset_type)length)
 			length = offset - is->offset;
 
 		const bool empty = !buffer.Consume(length);
diff --git a/src/input/FfmpegInputPlugin.cxx b/src/input/FfmpegInputPlugin.cxx
index e6eeaa8fc..0d9cf6b8f 100644
--- a/src/input/FfmpegInputPlugin.cxx
+++ b/src/input/FfmpegInputPlugin.cxx
@@ -34,6 +34,8 @@ extern "C" {
 #include <libavformat/avformat.h>
 }
 
+#include <glib.h>
+
 struct FfmpegInputStream {
 	struct input_stream base;
 
@@ -146,7 +148,8 @@ input_ffmpeg_eof(struct input_stream *is)
 }
 
 static bool
-input_ffmpeg_seek(struct input_stream *is, goffset offset, int whence,
+input_ffmpeg_seek(struct input_stream *is, InputPlugin::offset_type offset,
+		  int whence,
 		  Error &error)
 {
 	FfmpegInputStream *i = (FfmpegInputStream *)is;
diff --git a/src/input/FileInputPlugin.cxx b/src/input/FileInputPlugin.cxx
index 221dbff84..f52b1cd14 100644
--- a/src/input/FileInputPlugin.cxx
+++ b/src/input/FileInputPlugin.cxx
@@ -97,12 +97,13 @@ input_file_open(const char *filename,
 }
 
 static bool
-input_file_seek(struct input_stream *is, goffset offset, int whence,
+input_file_seek(struct input_stream *is, InputPlugin::offset_type offset,
+		int whence,
 		Error &error)
 {
 	FileInputStream *fis = (FileInputStream *)is;
 
-	offset = (goffset)lseek(fis->fd, (off_t)offset, whence);
+	offset = (InputPlugin::offset_type)lseek(fis->fd, (off_t)offset, whence);
 	if (offset < 0) {
 		error.SetErrno("Failed to seek");
 		return false;
diff --git a/src/input/RewindInputPlugin.cxx b/src/input/RewindInputPlugin.cxx
index 2088d8eea..567fb6888 100644
--- a/src/input/RewindInputPlugin.cxx
+++ b/src/input/RewindInputPlugin.cxx
@@ -164,7 +164,7 @@ input_rewind_read(struct input_stream *is, void *ptr, size_t size,
 
 		size_t nbytes = r->input->Read(ptr, size, error);
 
-		if (r->input->offset > (goffset)sizeof(r->buffer))
+		if (r->input->offset > (InputPlugin::offset_type)sizeof(r->buffer))
 			/* disable buffering */
 			r->tail = 0;
 		else if (r->tail == (size_t)is->offset) {
@@ -191,14 +191,16 @@ input_rewind_eof(struct input_stream *is)
 }
 
 static bool
-input_rewind_seek(struct input_stream *is, goffset offset, int whence,
+input_rewind_seek(struct input_stream *is, InputPlugin::offset_type offset,
+		  int whence,
 		  Error &error)
 {
 	RewindInputStream *r = (RewindInputStream *)is;
 
 	assert(is->ready);
 
-	if (whence == SEEK_SET && r->tail > 0 && offset <= (goffset)r->tail) {
+	if (whence == SEEK_SET && r->tail > 0 &&
+	    offset <= (InputPlugin::offset_type)r->tail) {
 		/* buffered seek */
 
 		assert(!r->ReadingFromBuffer() ||