system/ByteOrder: new library for byte ordering / endianess

src/decoder/DsdiffDecoderPlugin.cxx

@@ -33,6 +33,7 @@
 #include "CheckAudioFormat.hxx"
 #include "util/bit_reverse.h"
 #include "util/Error.hxx"
+#include "system/ByteOrder.hxx"
 #include "tag/TagHandler.hxx"
 #include "DsdLib.hxx"
 #include "Log.hxx"
@@ -56,8 +57,8 @@ struct DsdiffChunkHeader {
 	 */
 	gcc_const
 	uint64_t GetSize() const {
-		return (((uint64_t)GUINT32_FROM_BE(size_high)) << 32) |
-			((uint64_t)GUINT32_FROM_BE(size_low));
+		return (uint64_t(FromBE32(size_high)) << 32) |
+			uint64_t(FromBE32(size_low));
 	}
 };
 
@@ -141,7 +142,7 @@ dsdiff_read_prop_snd(struct decoder *decoder, struct input_stream *is,
 						 sizeof(sample_rate)))
 				return false;
 
-			metadata->sample_rate = GUINT32_FROM_BE(sample_rate);
+			metadata->sample_rate = FromBE32(sample_rate);
 		} else if (dsdlib_id_equals(&header.id, "CHNL")) {
 			uint16_t channels;
 			if (header.GetSize() < sizeof(channels) ||
@@ -150,7 +151,7 @@ dsdiff_read_prop_snd(struct decoder *decoder, struct input_stream *is,
 			    !dsdlib_skip_to(decoder, is, chunk_end_offset))
 				return false;
 
-			metadata->channels = GUINT16_FROM_BE(channels);
+			metadata->channels = FromBE16(channels);
 		} else if (dsdlib_id_equals(&header.id, "CMPR")) {
 			struct dsdlib_id type;
 			if (header.GetSize() < sizeof(type) ||
@@ -211,7 +212,7 @@ dsdiff_handle_native_tag(struct input_stream *is,
 	if (!dsdlib_read(nullptr, is, &metatag, sizeof(metatag)))
 		return;
 
-	uint32_t length = GUINT32_FROM_BE(metatag.size);
+	uint32_t length = FromBE32(metatag.size);
 
 	/* Check and limit size of the tag to prevent a stack overflow */
 	if (length == 0 || length > 60)

src/decoder/DsfDecoderPlugin.cxx

@@ -34,6 +34,7 @@
 #include "CheckAudioFormat.hxx"
 #include "util/bit_reverse.h"
 #include "util/Error.hxx"
+#include "system/ByteOrder.hxx"
 #include "DsdLib.hxx"
 #include "tag/TagHandler.hxx"
 #include "Log.hxx"
@@ -107,16 +108,16 @@ dsf_read_metadata(struct decoder *decoder, struct input_stream *is,
 	    !dsdlib_id_equals(&dsf_header.id, "DSD "))
 		return false;
 
-	chunk_size = (((uint64_t)GUINT32_FROM_LE(dsf_header.size_high)) << 32) |
-		((uint64_t)GUINT32_FROM_LE(dsf_header.size_low));
+	chunk_size = (uint64_t(FromLE32(dsf_header.size_high)) << 32) |
+		uint64_t(FromLE32(dsf_header.size_low));
 
 	if (sizeof(dsf_header) != chunk_size)
 		return false;
 
 #ifdef HAVE_ID3TAG
 	uint64_t metadata_offset;
-	metadata_offset = (((uint64_t)GUINT32_FROM_LE(dsf_header.pmeta_high)) << 32) |
-			   ((uint64_t)GUINT32_FROM_LE(dsf_header.pmeta_low));
+	metadata_offset = (uint64_t(FromLE32(dsf_header.pmeta_high)) << 32) |
+		uint64_t(FromLE32(dsf_header.pmeta_low));
 #endif
 
 	/* read the 'fmt ' chunk of the DSF file */
@@ -126,13 +127,13 @@ dsf_read_metadata(struct decoder *decoder, struct input_stream *is,
 		return false;
 
 	uint64_t fmt_chunk_size;
-	fmt_chunk_size = (((uint64_t)GUINT32_FROM_LE(dsf_fmt_chunk.size_high)) << 32) |
-			  ((uint64_t)GUINT32_FROM_LE(dsf_fmt_chunk.size_low));
+	fmt_chunk_size = (uint64_t(FromLE32(dsf_fmt_chunk.size_high)) << 32) |
+		uint64_t(FromLE32(dsf_fmt_chunk.size_low));
 
 	if (fmt_chunk_size != sizeof(dsf_fmt_chunk))
 		return false;
 
-	uint32_t samplefreq = (uint32_t)GUINT32_FROM_LE(dsf_fmt_chunk.sample_freq);
+	uint32_t samplefreq = FromLE32(dsf_fmt_chunk.sample_freq);
 
 	/* for now, only support version 1 of the standard, DSD raw stereo
 	   files with a sample freq of 2822400 Hz */
@@ -143,7 +144,7 @@ dsf_read_metadata(struct decoder *decoder, struct input_stream *is,
 	    || samplefreq != 2822400)
 		return false;
 
-	uint32_t chblksize = (uint32_t)GUINT32_FROM_LE(dsf_fmt_chunk.block_size);
+	uint32_t chblksize = FromLE32(dsf_fmt_chunk.block_size);
 	/* according to the spec block size should always be 4096 */
 	if (chblksize != 4096)
 		return false;
@@ -158,8 +159,8 @@ dsf_read_metadata(struct decoder *decoder, struct input_stream *is,
 	   we use the actual data size as chunk size */
 
 	uint64_t data_size;
-	data_size = (((uint64_t)GUINT32_FROM_LE(data_chunk.size_high)) << 32) |
-		((uint64_t)GUINT32_FROM_LE(data_chunk.size_low));
+	data_size = (uint64_t(FromLE32(data_chunk.size_high)) << 32) |
+		uint64_t(FromLE32(data_chunk.size_low));
 	data_size -= sizeof(data_chunk);
 
 	metadata->chunk_size = data_size;

src/decoder/VorbisDecoderPlugin.cxx

@@ -27,6 +27,7 @@
 #include "util/Error.hxx"
 #include "util/UriUtil.hxx"
 #include "util/Macros.hxx"
+#include "system/ByteOrder.hxx"
 #include "CheckAudioFormat.hxx"
 #include "tag/TagHandler.hxx"
 #include "Log.hxx"
@@ -47,18 +48,10 @@
 #define ov_time_seek_page(VF, S) (ov_time_seek_page(VF, (S)*1000))
 #endif /* HAVE_TREMOR */
 
-#include <glib.h>
-
 #include <assert.h>
 #include <errno.h>
 #include <unistd.h>
 
-#if G_BYTE_ORDER == G_BIG_ENDIAN
-#define VORBIS_BIG_ENDIAN true
-#else
-#define VORBIS_BIG_ENDIAN false
-#endif
-
 struct vorbis_input_stream {
 	struct decoder *decoder;
 
@@ -248,7 +241,7 @@ vorbis_stream_decode(struct decoder *decoder,
 
 #ifdef HAVE_TREMOR
 		long nbytes = ov_read(&vf, buffer, sizeof(buffer),
-				      VORBIS_BIG_ENDIAN, 2, 1,
+				      IsBigEndian(), 2, 1,
 				      &current_section);
 #else
 		float **per_channel;

src/decoder/sidplay_decoder_plugin.cxx

@@ -21,6 +21,7 @@
 #include "../DecoderAPI.hxx"
 #include "tag/TagHandler.hxx"
 #include "util/Domain.hxx"
+#include "system/ByteOrder.hxx"
 #include "Log.hxx"
 
 #include <errno.h>
@@ -265,11 +266,9 @@ sidplay_file_decode(struct decoder *decoder, const char *path_fs)
 	config.sidEmulation = &builder;
 	config.sidModel = SID2_MODEL_CORRECT;
 	config.sidSamples = true;
-#if G_BYTE_ORDER == G_LITTLE_ENDIAN
-	config.sampleFormat = SID2_LITTLE_SIGNED;
-#else
-	config.sampleFormat = SID2_BIG_SIGNED;
-#endif
+	config.sampleFormat = IsLittleEndian()
+		? SID2_LITTLE_SIGNED
+		: SID2_BIG_SIGNED;
 	if (tune.isStereo()) {
 		config.playback = sid2_stereo;
 		channels = 2;

src/encoder/OpusEncoderPlugin.cxx

@@ -25,6 +25,7 @@
 #include "ConfigError.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
+#include "system/ByteOrder.hxx"
 
 #include <opus.h>
 #include <ogg/ogg.h>
@@ -338,9 +339,9 @@ opus_encoder_generate_head(struct opus_encoder *encoder)
 	memcpy(header, "OpusHead", 8);
 	header[8] = 1;
 	header[9] = encoder->audio_format.channels;
-	*(uint16_t *)(header + 10) = GUINT16_TO_LE(encoder->lookahead);
+	*(uint16_t *)(header + 10) = ToLE16(encoder->lookahead);
 	*(uint32_t *)(header + 12) =
-		GUINT32_TO_LE(encoder->audio_format.sample_rate);
+		ToLE32(encoder->audio_format.sample_rate);
 	header[16] = 0;
 	header[17] = 0;
 	header[18] = 0;
@@ -365,9 +366,9 @@ opus_encoder_generate_tags(struct opus_encoder *encoder)
 	size_t comments_size = 8 + 4 + version_length + 4;
 	unsigned char *comments = (unsigned char *)g_malloc(comments_size);
 	memcpy(comments, "OpusTags", 8);
-	*(uint32_t *)(comments + 8) = GUINT32_TO_LE(version_length);
+	*(uint32_t *)(comments + 8) = ToLE32(version_length);
 	memcpy(comments + 12, version, version_length);
-	*(uint32_t *)(comments + 12 + version_length) = GUINT32_TO_LE(0);
+	*(uint32_t *)(comments + 12 + version_length) = ToLE32(0);
 
 	ogg_packet packet;
 	packet.packet = comments;

src/encoder/WaveEncoderPlugin.cxx

@@ -20,6 +20,7 @@
 #include "config.h"
 #include "WaveEncoderPlugin.hxx"
 #include "EncoderAPI.hxx"
+#include "system/ByteOrder.hxx"
 #include "util/fifo_buffer.h"
 extern "C" {
 #include "util/growing_fifo.h"
@@ -62,24 +63,23 @@ fill_wave_header(struct wave_header *header, int channels, int bits,
 	int data_size = 0x0FFFFFFF;
 
 	/* constants */
-	header->id_riff = GUINT32_TO_LE(0x46464952);
-	header->id_wave = GUINT32_TO_LE(0x45564157);
-	header->id_fmt = GUINT32_TO_LE(0x20746d66);
-	header->id_data = GUINT32_TO_LE(0x61746164);
+	header->id_riff = ToLE32(0x46464952);
+	header->id_wave = ToLE32(0x45564157);
+	header->id_fmt = ToLE32(0x20746d66);
+	header->id_data = ToLE32(0x61746164);
 
         /* wave format */
-	header->format = GUINT16_TO_LE(1);		// PCM_FORMAT
-	header->channels = GUINT16_TO_LE(channels);
-	header->bits = GUINT16_TO_LE(bits);
-	header->freq = GUINT32_TO_LE(freq);
-	header->blocksize = GUINT16_TO_LE(block_size);
-	header->byterate = GUINT32_TO_LE(freq * block_size);
+	header->format = ToLE16(1); // PCM_FORMAT
+	header->channels = ToLE16(channels);
+	header->bits = ToLE16(bits);
+	header->freq = ToLE32(freq);
+	header->blocksize = ToLE16(block_size);
+	header->byterate = ToLE32(freq * block_size);
 
         /* chunk sizes (fake data length) */
-	header->fmt_size = GUINT32_TO_LE(16);
-	header->data_size = GUINT32_TO_LE(data_size);
-	header->riff_size = GUINT32_TO_LE(4 + (8 + 16) +
-					 (8 + data_size));
+	header->fmt_size = ToLE32(16);
+	header->data_size = ToLE32(data_size);
+	header->riff_size = ToLE32(4 + (8 + 16) + (8 + data_size));
 }
 
 static Encoder *
@@ -153,29 +153,29 @@ wave_encoder_close(Encoder *_encoder)
 	fifo_buffer_free(encoder->buffer);
 }
 
-static inline size_t
+static size_t
 pcm16_to_wave(uint16_t *dst16, const uint16_t *src16, size_t length)
 {
 	size_t cnt = length >> 1;
 	while (cnt > 0) {
-		*dst16++ = GUINT16_TO_LE(*src16++);
+		*dst16++ = ToLE16(*src16++);
 		cnt--;
 	}
 	return length;
 }
 
-static inline size_t
+static size_t
 pcm32_to_wave(uint32_t *dst32, const uint32_t *src32, size_t length)
 {
 	size_t cnt = length >> 2;
 	while (cnt > 0){
-		*dst32++ = GUINT32_TO_LE(*src32++);
+		*dst32++ = ToLE32(*src32++);
 		cnt--;
 	}
 	return length;
 }
 
-static inline size_t
+static size_t
 pcm24_to_wave(uint8_t *dst8, const uint32_t *src32, size_t length)
 {
 	uint32_t value;
@@ -202,35 +202,35 @@ wave_encoder_write(Encoder *_encoder,
 
 	uint8_t *dst = (uint8_t *)growing_fifo_write(&encoder->buffer, length);
 
-#if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
-	switch (encoder->bits) {
-	case 8:
-	case 16:
-	case 32:// optimized cases
-		memcpy(dst, src, length);
-		break;
-	case 24:
-		length = pcm24_to_wave(dst, (const uint32_t *)src, length);
-		break;
-	}
-#elif (G_BYTE_ORDER == G_BIG_ENDIAN)
-	switch (encoder->bits) {
-	case 8:
-		memcpy(dst, src, length);
-		break;
-	case 16:
-		length = pcm16_to_wave(dst, (const uint16_t *)src, length);
-		break;
-	case 24:
-		length = pcm24_to_wave(dst, (const uint32_t *)src, length);
-		break;
-	case 32:
-		length = pcm32_to_wave(dst, (const uint32_t *)src, length);
-		break;
+	if (IsLittleEndian()) {
+		switch (encoder->bits) {
+		case 8:
+		case 16:
+		case 32:// optimized cases
+			memcpy(dst, src, length);
+			break;
+		case 24:
+			length = pcm24_to_wave(dst, (const uint32_t *)src, length);
+			break;
+		}
+	} else {
+		switch (encoder->bits) {
+		case 8:
+			memcpy(dst, src, length);
+			break;
+		case 16:
+			length = pcm16_to_wave((uint16_t *)dst,
+					       (const uint16_t *)src, length);
+			break;
+		case 24:
+			length = pcm24_to_wave(dst, (const uint32_t *)src, length);
+			break;
+		case 32:
+			length = pcm32_to_wave((uint32_t *)dst,
+					       (const uint32_t *)src, length);
+			break;
+		}
 	}
-#else
-#error G_BYTE_ORDER set to G_PDP_ENDIAN is not supported by wave_encoder
-#endif
 
 	fifo_buffer_append(encoder->buffer, length);
 	return true;

src/input/CdioParanoiaInputPlugin.cxx

@@ -28,6 +28,7 @@
 #include "InputPlugin.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
+#include "system/ByteOrder.hxx"
 #include "Log.hxx"
 
 #include <stdio.h>
@@ -202,12 +203,12 @@ input_cdio_open(const char *uri,
 
 	case 0:
 		LogDebug(cdio_domain, "drive returns audio data Little Endian");
-		reverse_endian = G_BYTE_ORDER == G_BIG_ENDIAN;
+		reverse_endian = IsBigEndian();
 		break;
 
 	case 1:
 		LogDebug(cdio_domain, "drive returns audio data Big Endian");
-		reverse_endian = G_BYTE_ORDER == G_LITTLE_ENDIAN;
+		reverse_endian = IsLittleEndian();
 		break;
 
 	default:

src/output/OSXOutputPlugin.cxx

@@ -25,9 +25,9 @@
 #include "util/Domain.hxx"
 #include "thread/Mutex.hxx"
 #include "thread/Cond.hxx"
+#include "system/ByteOrder.hxx"
 #include "Log.hxx"
 
-#include <glib.h>
 #include <CoreAudio/AudioHardware.h>
 #include <AudioUnit/AudioUnit.h>
 #include <CoreServices/CoreServices.h>
@@ -342,9 +342,8 @@ osx_output_open(struct audio_output *ao, AudioFormat &audio_format,
 		break;
 	}
 
-#if G_BYTE_ORDER == G_BIG_ENDIAN
-	stream_description.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
-#endif
+	if (IsBigEndian())
+		stream_description.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
 
 	stream_description.mBytesPerPacket = audio_format.GetFrameSize();
 	stream_description.mFramesPerPacket = 1;

src/output/OssOutputPlugin.cxx

@@ -25,10 +25,9 @@
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
 #include "util/Macros.hxx"
+#include "system/ByteOrder.hxx"
 #include "Log.hxx"
 
-#include <glib.h>
-
 #include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <fcntl.h>
@@ -532,7 +531,7 @@ oss_probe_sample_format(int fd, SampleFormat sample_format,
 	pcm_export.Open(sample_format, 0, false, false,
 			oss_format == AFMT_S24_PACKED,
 			oss_format == AFMT_S24_PACKED &&
-			G_BYTE_ORDER != G_LITTLE_ENDIAN);
+			!IsLittleEndian());
 #endif
 
 	return SUCCESS;

src/pcm/PcmPack.cxx

@@ -18,15 +18,14 @@
  */
 
 #include "PcmPack.hxx"
-
-#include <glib.h>
+#include "system/ByteOrder.hxx"
 
 static void
 pack_sample(uint8_t *dest, const int32_t *src0)
 {
 	const uint8_t *src = (const uint8_t *)src0;
 
-	if (G_BYTE_ORDER == G_BIG_ENDIAN)
+	if (IsBigEndian())
 		++src;
 
 	*dest++ = *src++;
@@ -51,7 +50,7 @@ unpack_sample(int32_t *dest0, const uint8_t *src)
 {
 	uint8_t *dest = (uint8_t *)dest0;
 
-	if (G_BYTE_ORDER == G_BIG_ENDIAN)
+	if (IsBigEndian())
 		/* extend the sign bit to the most fourth byte */
 		*dest++ = *src & 0x80 ? 0xff : 0x00;
 
@@ -59,7 +58,7 @@ unpack_sample(int32_t *dest0, const uint8_t *src)
 	*dest++ = *src++;
 	*dest++ = *src;
 
-	if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
+	if (IsLittleEndian())
 		/* extend the sign bit to the most fourth byte */
 		*dest++ = *src & 0x80 ? 0xff : 0x00;
 }

src/system/ByteOrder.hxx

+/*
+ * Copyright (C) 2011-2013 Max Kellermann <max@duempel.org>,
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef BYTE_ORDER_HXX
+#define BYTE_ORDER_HXX
+
+#include <stdint.h>
+
+#if defined(__i386__) || defined(__x86_64__) || defined(__ARMEL__)
+#define IS_LITTLE_ENDIAN true
+#define IS_BIG_ENDIAN false
+#else
+#define IS_LITTLE_ENDIAN true
+#define IS_BIG_ENDIAN false;
+#endif
+
+static inline constexpr bool
+IsLittleEndian()
+{
+	return IS_LITTLE_ENDIAN;
+}
+
+static inline constexpr bool
+IsBigEndian()
+{
+	return IS_BIG_ENDIAN;
+}
+
+static inline constexpr uint16_t
+ByteSwap16(uint16_t value)
+{
+  return (value >> 8) | (value << 8);
+}
+
+static inline constexpr uint32_t
+ByteSwap32(uint32_t value)
+{
+  return (value >> 24) | ((value >> 8) & 0x0000ff00) |
+    ((value << 8) & 0x00ff0000) | (value << 24);
+}
+
+static inline constexpr uint64_t
+ByteSwap64(uint64_t value)
+{
+  return uint64_t(ByteSwap32(uint32_t(value >> 32)))
+    | (uint64_t(ByteSwap32(value)) << 32);
+}
+
+/**
+ * Converts a 16bit value from big endian to the system's byte order
+ */
+static inline constexpr uint16_t
+FromBE16(uint16_t value)
+{
+	return IsBigEndian() ? value : ByteSwap16(value);
+}
+
+/**
+ * Converts a 32bit value from big endian to the system's byte order
+ */
+static inline constexpr uint32_t
+FromBE32(uint32_t value)
+{
+	return IsBigEndian() ? value : ByteSwap32(value);
+}
+
+/**
+ * Converts a 64bit value from big endian to the system's byte order
+ */
+static inline constexpr uint64_t
+FromBE64(uint64_t value)
+{
+	return IsBigEndian() ? value : ByteSwap64(value);
+}
+
+/**
+ * Converts a 16bit value from little endian to the system's byte order
+ */
+static inline constexpr uint16_t
+FromLE16(uint16_t value)
+{
+	return IsLittleEndian() ? value : ByteSwap16(value);
+}
+
+/**
+ * Converts a 32bit value from little endian to the system's byte order
+ */
+static inline constexpr uint32_t
+FromLE32(uint32_t value)
+{
+	return IsLittleEndian() ? value : ByteSwap32(value);
+}
+
+/**
+ * Converts a 64bit value from little endian to the system's byte order
+ */
+static inline constexpr uint64_t
+FromLE64(uint64_t value)
+{
+	return IsLittleEndian() ? value : ByteSwap64(value);
+}
+
+/**
+ * Converts a 16bit value from the system's byte order to big endian
+ */
+static inline constexpr uint16_t
+ToBE16(uint16_t value)
+{
+	return IsBigEndian() ? value : ByteSwap16(value);
+}
+
+/**
+ * Converts a 32bit value from the system's byte order to big endian
+ */
+static inline constexpr uint32_t
+ToBE32(uint32_t value)
+{
+	return IsBigEndian() ? value : ByteSwap32(value);
+}
+
+/**
+ * Converts a 64bit value from the system's byte order to big endian
+ */
+static inline constexpr uint64_t
+ToBE64(uint64_t value)
+{
+	return IsBigEndian() ? value : ByteSwap64(value);
+}
+
+/**
+ * Converts a 16bit value from the system's byte order to little endian
+ */
+static inline constexpr uint16_t
+ToLE16(uint16_t value)
+{
+	return IsLittleEndian() ? value : ByteSwap16(value);
+}
+
+/**
+ * Converts a 32bit value from the system's byte order to little endian
+ */
+static inline constexpr uint32_t
+ToLE32(uint32_t value)
+{
+	return IsLittleEndian() ? value : ByteSwap32(value);
+}
+
+/**
+ * Converts a 64bit value from the system's byte order to little endian
+ */
+static inline constexpr uint64_t
+ToLE64(uint64_t value)
+{
+	return IsLittleEndian() ? value : ByteSwap64(value);
+}
+
+#endif

src/tag/Aiff.cxx

@@ -20,6 +20,7 @@
 #include "config.h" /* must be first for large file support */
 #include "Aiff.hxx"
 #include "util/Domain.hxx"
+#include "system/ByteOrder.hxx"
 #include "Log.hxx"
 
 #include <glib.h>
@@ -65,7 +66,7 @@ aiff_seek_id3(FILE *file)
 	size_t size = fread(&header, sizeof(header), 1, file);
 	if (size != 1 ||
 	    memcmp(header.id, "FORM", 4) != 0 ||
-	    GUINT32_FROM_BE(header.size) > (uint32_t)st.st_size ||
+	    FromBE32(header.size) > (uint32_t)st.st_size ||
 	    (memcmp(header.format, "AIFF", 4) != 0 &&
 	     memcmp(header.format, "AIFC", 4) != 0))
 		/* not a AIFF file */
@@ -79,7 +80,7 @@ aiff_seek_id3(FILE *file)
 		if (size != 1)
 			return 0;
 
-		size = GUINT32_FROM_BE(chunk.size);
+		size = FromBE32(chunk.size);
 		if (size > G_MAXINT32)
 			/* too dangerous, bail out: possible integer
 			   underflow when casting to off_t */

src/tag/ApeLoader.cxx

@@ -19,6 +19,7 @@
 
 #include "config.h"
 #include "ApeLoader.hxx"
+#include "system/ByteOrder.hxx"
 
 #include <glib.h>
 
@@ -44,11 +45,11 @@ ape_scan_internal(FILE *fp, ApeTagCallback callback)
 	if (fseek(fp, -(long)sizeof(footer), SEEK_END) ||
 	    fread(&footer, 1, sizeof(footer), fp) != sizeof(footer) ||
 	    memcmp(footer.id, "APETAGEX", sizeof(footer.id)) != 0 ||
-	    GUINT32_FROM_LE(footer.version) != 2000)
+	    FromLE32(footer.version) != 2000)
 		return false;
 
 	/* find beginning of ape tag */
-	size_t remaining = GUINT32_FROM_LE(footer.length);
+	size_t remaining = FromLE32(footer.length);
 	if (remaining <= sizeof(footer) + 10 ||
 	    /* refuse to load more than one megabyte of tag data */
 	    remaining > 1024 * 1024 ||
@@ -66,13 +67,13 @@ ape_scan_internal(FILE *fp, ApeTagCallback callback)
 	}
 
 	/* read tags */
-	unsigned n = GUINT32_FROM_LE(footer.count);
+	unsigned n = FromLE32(footer.count);
 	const char *p = buffer;
 	while (n-- && remaining > 10) {
-		size_t size = GUINT32_FROM_LE(*(const uint32_t *)p);
+		size_t size = FromLE32(*(const uint32_t *)p);
 		p += 4;
 		remaining -= 4;
-		unsigned long flags = GUINT32_FROM_LE(*(const uint32_t *)p);
+		unsigned long flags = FromLE32(*(const uint32_t *)p);
 		p += 4;
 		remaining -= 4;
 

src/tag/Riff.cxx

@@ -20,6 +20,7 @@
 #include "config.h" /* must be first for large file support */
 #include "Riff.hxx"
 #include "util/Domain.hxx"
+#include "system/ByteOrder.hxx"
 #include "Log.hxx"
 
 #include <glib.h>
@@ -65,7 +66,7 @@ riff_seek_id3(FILE *file)
 	size_t size = fread(&header, sizeof(header), 1, file);
 	if (size != 1 ||
 	    memcmp(header.id, "RIFF", 4) != 0 ||
-	    GUINT32_FROM_LE(header.size) > (uint32_t)st.st_size)
+	    FromLE32(header.size) > (uint32_t)st.st_size)
 		/* not a RIFF file */
 		return 0;
 
@@ -77,7 +78,7 @@ riff_seek_id3(FILE *file)
 		if (size != 1)
 			return 0;
 
-		size = GUINT32_FROM_LE(chunk.size);
+		size = FromLE32(chunk.size);
 		if (size > G_MAXINT32)
 			/* too dangerous, bail out: possible integer
 			   underflow when casting to off_t */

src/util/ByteReverse.cxx

@@ -18,9 +18,9 @@
  */
 
 #include "ByteReverse.hxx"
+#include "system/ByteOrder.hxx"
 #include "Compiler.h"
 
-#include <glib.h>
 #include <assert.h>
 
 void
@@ -33,7 +33,7 @@ reverse_bytes_16(uint16_t *gcc_restrict dest,
 
 	while (src < src_end) {
 		const uint16_t x = *src++;
-		*dest++ = GUINT16_SWAP_LE_BE(x);
+		*dest++ = ByteSwap16(x);
 	}
 }
 
@@ -47,7 +47,7 @@ reverse_bytes_32(uint32_t *gcc_restrict dest,
 
 	while (src < src_end) {
 		const uint32_t x = *src++;
-		*dest++ = GUINT32_SWAP_LE_BE(x);
+		*dest++ = ByteSwap32(x);
 	}
 }
 
@@ -61,7 +61,7 @@ reverse_bytes_64(uint64_t *gcc_restrict dest,
 
 	while (src < src_end) {
 		const uint64_t x = *src++;
-		*dest++ = GUINT64_SWAP_LE_BE(x);
+		*dest++ = ByteSwap64(x);
 	}
 }
 

test/test_pcm_pack.cxx

@@ -20,6 +20,7 @@
 #include "test_pcm_all.hxx"
 #include "test_pcm_util.hxx"
 #include "pcm/PcmPack.hxx"
+#include "system/ByteOrder.hxx"
 
 #include <glib.h>
 
@@ -34,7 +35,7 @@ test_pcm_pack_24()
 
 	for (unsigned i = 0; i < N; ++i) {
 		int32_t d;
-		if (G_BYTE_ORDER == G_BIG_ENDIAN)
+		if (IsBigEndian())
 			d = (dest[i * 3] << 16) | (dest[i * 3 + 1] << 8)
 				| dest[i * 3 + 2];
 		else
@@ -58,7 +59,7 @@ test_pcm_unpack_24()
 
 	for (unsigned i = 0; i < N; ++i) {
 		int32_t s;
-		if (G_BYTE_ORDER == G_BIG_ENDIAN)
+		if (IsBigEndian())
 			s = (src[i * 3] << 16) | (src[i * 3 + 1] << 8)
 				| src[i * 3 + 2];
 		else