utils: add endian_inl.h

moves the following to this header:
- htole*() definitions from bit_writer.c
- __BIG_ENDIAN__ fallback define from bit_reader_inl.h

Change-Id: I7fff59543f08a70bf8f9ddac849b72ed290471b1

makefile.unix

@@ -246,10 +246,13 @@ all: ex $(EXTRA_EXAMPLES)
 
 $(EX_FORMAT_DEC_OBJS): %.o: %.h
 
-# special dependencies for tree.c/vp8.c/bit_reader.c <-> bit_reader_inl.h
-src/dec/tree.o: src/utils/bit_reader_inl.h
-src/dec/vp8.o: src/utils/bit_reader_inl.h
-src/utils/bit_reader.o: src/utils/bit_reader_inl.h
+# special dependencies:
+#   tree.c/vp8.c/bit_reader.c <-> bit_reader_inl.h, endian_inl.h
+#   bit_writer.c <-> endian_inl.h
+src/dec/tree.o: src/utils/bit_reader_inl.h src/utils/endian_inl.h
+src/dec/vp8.o: src/utils/bit_reader_inl.h src/utils/endian_inl.h
+src/utils/bit_reader.o: src/utils/bit_reader_inl.h src/utils/endian_inl.h
+src/utils/bit_writer.o: src/utils/endian_inl.h
 
 %.o: %.c $(HDRS)
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@

src/utils/Makefile.am

@@ -13,6 +13,7 @@ COMMON_SOURCES += bit_reader.h
 COMMON_SOURCES += bit_reader_inl.h
 COMMON_SOURCES += color_cache.c
 COMMON_SOURCES += color_cache.h
+COMMON_SOURCES += endian_inl.h
 COMMON_SOURCES += filters.c
 COMMON_SOURCES += filters.h
 COMMON_SOURCES += huffman.c

src/utils/bit_reader_inl.h

@@ -17,6 +17,7 @@
 #define WEBP_UTILS_BIT_READER_INL_H_
 
 #include "./bit_reader.h"
+#include "./endian_inl.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -35,12 +36,6 @@ typedef uint16_t lbit_t;
 typedef uint8_t lbit_t;
 #endif
 
-// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
-#if !defined(__BIG_ENDIAN__) && defined(__BYTE_ORDER__) && \
-    (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
-#define __BIG_ENDIAN__
-#endif
-
 // gcc 4.3 has builtin functions for swap32/swap64
 #if defined(__GNUC__) && \
            (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))

src/utils/bit_writer.c

@@ -17,6 +17,7 @@
 #include <stdlib.h>
 
 #include "./bit_writer.h"
+#include "./endian_inl.h"
 #include "./utils.h"
 
 //------------------------------------------------------------------------------
@@ -204,35 +205,6 @@ void VP8BitWriterWipeOut(VP8BitWriter* const bw) {
 #define VP8L_WRITER_BITS (VP8L_WRITER_BYTES * 8)
 #define VP8L_WRITER_MAX_BITS (8 * (int)sizeof(vp8l_atype_t))
 
-//  endian-specific htoleXX() definition
-// TODO(skal): move this to config.h, and collect all the endian-related code
-// in a proper .h file
-#if defined(_WIN32)
-#if !defined(_M_PPC)
-#define htole32(x) (x)
-#define htole16(x) (x)
-#else     // PPC is BIG_ENDIAN
-#include <stdlib.h>
-#define htole32(x) (_byteswap_ulong((unsigned long)(x)))
-#define htole16(x) (_byteswap_ushort((unsigned short)(x)))
-#endif    // _M_PPC
-#elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || \
-      defined(__DragonFly__)
-#include <sys/endian.h>
-#elif defined(__APPLE__)
-#include <libkern/OSByteOrder.h>
-#define htole32 OSSwapHostToLittleInt32
-#define htole16 OSSwapHostToLittleInt16
-#elif defined(__native_client__) && !defined(__GLIBC__)
-// NaCl without glibc is assumed to be little-endian
-#define htole32(x) (x)
-#define htole16(x) (x)
-#elif defined(__QNX__)
-#include <net/netbyte.h>
-#else     // pretty much all linux and/or glibc
-#include <endian.h>
-#endif
-
 // Returns 1 on success.
 static int VP8LBitWriterResize(VP8LBitWriter* const bw, size_t extra_size) {
   uint8_t* allocated_buf;

src/utils/endian_inl.h

@@ -0,0 +1,50 @@
+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Endian related functions.
+
+#ifndef WEBP_UTILS_ENDIAN_INL_H_
+#define WEBP_UTILS_ENDIAN_INL_H_
+
+// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
+#if !defined(__BIG_ENDIAN__) && defined(__BYTE_ORDER__) && \
+    (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
+#define __BIG_ENDIAN__
+#endif
+
+//  endian-specific htoleXX() definition
+// TODO(skal): add a test for htoleXX() in endian.h and others in autoconf or
+// remove it and replace with a generic implementation.
+#if defined(_WIN32)
+#if !defined(_M_PPC)
+#define htole32(x) (x)
+#define htole16(x) (x)
+#else     // PPC is BIG_ENDIAN
+#include <stdlib.h>
+#define htole32(x) (_byteswap_ulong((unsigned long)(x)))
+#define htole16(x) (_byteswap_ushort((unsigned short)(x)))
+#endif    // _M_PPC
+#elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || \
+      defined(__DragonFly__)
+#include <sys/endian.h>
+#elif defined(__APPLE__)
+#include <libkern/OSByteOrder.h>
+#define htole32 OSSwapHostToLittleInt32
+#define htole16 OSSwapHostToLittleInt16
+#elif defined(__native_client__) && !defined(__GLIBC__)
+// NaCl without glibc is assumed to be little-endian
+#define htole32(x) (x)
+#define htole16(x) (x)
+#elif defined(__QNX__)
+#include <net/netbyte.h>
+#else     // pretty much all linux and/or glibc
+#include <endian.h>
+#endif
+
+#endif  // WEBP_UTILS_ENDIAN_INL_H_