From 676aac180745f9dcff8b475160bb9c8beb4ea71f Mon Sep 17 00:00:00 2001
From: Rosen Penev <rosenp@gmail.com>
Date: Wed, 12 Jul 2023 08:56:50 -0700
Subject: [PATCH] remove endian handling

There's std::endian now.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 include/exiv2/config.h | 14 --------------
 src/bmffimage.cpp      |  3 ++-
 src/image.cpp          | 11 ++---------
 src/jp2image.cpp       |  3 ++-
 src/pgfimage.cpp       |  4 +++-
 5 files changed, 9 insertions(+), 26 deletions(-)

diff --git a/include/exiv2/config.h b/include/exiv2/config.h
index e55bd28bbb..d509df7743 100644
--- a/include/exiv2/config.h
+++ b/include/exiv2/config.h
@@ -31,20 +31,6 @@
 #endif
 #endif
 
-#ifndef __LITTLE_ENDIAN__
-#if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__)
-#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
-#define __LITTLE_ENDIAN__ 1
-#endif
-#endif
-#endif
-
-#ifndef __LITTLE_ENDIAN__
-#if defined(_WIN32) || defined(__CYGWIN__)
-#define __LITTLE_ENDIAN__ 1
-#endif
-#endif
-
 /*
   If you're using Solaris and the Solaris Studio compiler
   you must -library=stdcxx4 along with these inclusions below
diff --git a/src/bmffimage.cpp b/src/bmffimage.cpp
index 185672b9b8..895290b57a 100644
--- a/src/bmffimage.cpp
+++ b/src/bmffimage.cpp
@@ -21,6 +21,7 @@
 #endif
 
 // + standard includes
+#include <bit>
 #include <cinttypes>
 #include <cstdio>
 #include <cstring>
@@ -92,7 +93,7 @@ std::string BmffImage::toAscii(uint32_t n) {
       return '_';  // show 0 as _
     return '.';    // others .
   });
-  if (!isBigEndianPlatform())
+  if (std::endian::native == std::endian::little)
     std::reverse(result.begin(), result.end());
   return result;
 }
diff --git a/src/image.cpp b/src/image.cpp
index e4607c9b56..323d2e0928 100644
--- a/src/image.cpp
+++ b/src/image.cpp
@@ -168,14 +168,6 @@ bool Image::isPrintICC(uint16_t type, Exiv2::PrintStructureOption option) {
   return type == 0x8773 && option == kpsIccProfile;
 }
 
-bool Image::isBigEndianPlatform() {
-  return std::endian::native == std::endian::big;
-}
-
-bool Image::isLittleEndianPlatform() {
-  return std::endian::native == std::endian::little;
-}
-
 uint64_t Image::byteSwap(uint64_t value, bool bSwap) {
   uint64_t result = 0;
   auto source_value = reinterpret_cast<byte*>(&value);
@@ -509,7 +501,8 @@ void Image::printTiffStructure(BasicIo& io, std::ostream& out, Exiv2::PrintStruc
     // read header (we already know for certain that we have a Tiff file)
     io.readOrThrow(dir.data(), 8, ErrorCode::kerCorruptedMetadata);
     auto c = dir.read_uint8(0);
-    bool bSwap = (c == 'M' && isLittleEndianPlatform()) || (c == 'I' && isBigEndianPlatform());
+    bool bSwap = (c == 'M' && std::endian::native == std::endian::little) ||
+                 (c == 'I' && std::endian::native == std::endian::big);
     size_t start = byteSwap4(dir, 4, bSwap);
     printIFDStructure(io, out, option, start + offset, bSwap, c, depth);
   }
diff --git a/src/jp2image.cpp b/src/jp2image.cpp
index 0fbd4d22f9..38af2f6990 100644
--- a/src/jp2image.cpp
+++ b/src/jp2image.cpp
@@ -18,6 +18,7 @@
 
 #include <algorithm>
 #include <array>
+#include <bit>
 #include <iostream>
 
 namespace Exiv2 {
@@ -101,7 +102,7 @@ Jp2Image::Jp2Image(BasicIo::UniquePtr io, bool create) : Image(ImageType::jp2, m
 std::string Jp2Image::toAscii(uint32_t n) {
   const auto p = reinterpret_cast<const char*>(&n);
   std::string result(p, p + 4);
-  if (!isBigEndianPlatform())
+  if (std::endian::native == std::endian::little)
     std::reverse(result.begin(), result.end());
   return result;
 }
diff --git a/src/pgfimage.cpp b/src/pgfimage.cpp
index 11b7890e7d..aff5e51a44 100644
--- a/src/pgfimage.cpp
+++ b/src/pgfimage.cpp
@@ -10,6 +10,7 @@
 #include "futils.hpp"
 #include "image.hpp"
 
+#include <bit>
 #include <iostream>
 
 // Signature from front of PGF file
@@ -54,7 +55,8 @@ static uint32_t byteSwap_(Exiv2::DataBuf& buf, size_t offset, bool bSwap) {
 }
 
 PgfImage::PgfImage(BasicIo::UniquePtr io, bool create) :
-    Image(ImageType::pgf, mdExif | mdIptc | mdXmp | mdComment, std::move(io)), bSwap_(isBigEndianPlatform()) {
+    Image(ImageType::pgf, mdExif | mdIptc | mdXmp | mdComment, std::move(io)),
+    bSwap_(std::endian::native == std::endian::big) {
   if (create && io_->open() == 0) {
 #ifdef EXIV2_DEBUG_MESSAGES
     std::cerr << "Exiv2::PgfImage:: Creating PGF image to memory\n";