ENH: Update to expat 2.7.2 code changes

Manually upgrade from expat 2.4.1 to 2.7.2.

EXPAT_GE and XML_GE need to be set in expat 2.7.2, but do not
need to be viewed in ITK.

If the variable EXPAT_SHARED_LIBS is true, then we
must set the value of ITK_EXPAT_STATIC to 1, otherwise
the variable ITK_EXPAT_STATIC is expected to not exist.

Minimize the code differences between ITK and expat upstream 2.7.2 with
regards to dllexport and dllimport.

Minimize the code differences between ITK and expat upstream 2.7.2 with
regards to dllexport and dllimport.

Remove unused expatConfig.h configuration file

Remove unused expatDllConfig.h configuration file

Remove dependence on libexpat.def MSVC file

By using the upstream configuration for dllimport and dll export, it is no longer necessary to
create a compile time file to determine if static or shared libraries are used.

On linux build use the following to identify symbols in 2.7.2
```bash
nm lib/libITKEXPAT-6.0.a \
     | grep " [TRD] " \
     |  awk '{ print $3 }' \
     | sort -df \
     | awk '{ print "#define "$1" @MANGLE_PREFIX@_"$1 }'
```

Author: hjmjohnson

.gitattributes

@@ -54,6 +54,7 @@ Modules/ThirdParty/** hooks-max-size=300000 hooks.style=
 Modules/ThirdParty/ZLIB/src/itkzlib-ng/crc32_braid_tbl.h hooks-max-size=700000
 Modules/ThirdParty/GDCM/src/gdcm/Source/DataDictionary/privatedicts.xml hooks-max-size=400000
 Modules/Filtering/Denoising/include/itkPatchBasedDenoisingImageFilter.hxx hooks-max-size=120000
+Modules/ThirdParty/Expat/src/expat/lib/xmlparse.c hooks-max-size=320000
 Documentation/docs/releases/* hooks-max-size=300000
 Documentation/Art/* hooks-max-size=300000
 pixi.lock hooks-max-size=1000000

Modules/ThirdParty/Expat/CMakeLists.txt

@@ -17,6 +17,8 @@ else()
   )
 set(ITKExpat_LIBRARIES ITKEXPAT)
 set(ITK_LIBRARY_PROPERTIES WINDOWS_EXPORT_ALL_SYMBOLS FALSE)
+set(EXPAT_GE ON CACHE BOOL   "Define to make general entity parsing functionality available" FORCE)
+set(XML_GE 1    CACHE STRING "Define to make general entity parsing functionality available" FORCE)
 endif()
 
 itk_module_impl()

Modules/ThirdParty/Expat/src/CMakeLists.txt

@@ -20,4 +20,6 @@ mark_as_advanced(FORCE
   EXPAT_WITH_LIBBSD
   EXPAT_WITH_GETRANDOM
   EXPAT_WITH_SYS_GETRANDOM
+  EXPAT_GE
+  XML_GE
   )

Modules/ThirdParty/Expat/src/expat/CMakeLists.txt

@@ -1,5 +1,5 @@
 Copyright (c) 1998-2000 Thai Open Source Software Center Ltd and Clark Cooper
-Copyright (c) 2001-2019 Expat maintainers
+Copyright (c) 2001-2025 Expat maintainers
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

Modules/ThirdParty/Expat/src/expat/COPYING

@@ -46,18 +46,26 @@ else(WORDS_BIGENDIAN)
 endif(WORDS_BIGENDIAN)
 
 if(HAVE_SYS_TYPES_H)
-    check_symbol_exists("off_t" "sys/types.h" OFF_T)
-    check_symbol_exists("size_t" "sys/types.h" SIZE_T)
-else(HAVE_SYS_TYPES_H)
-    set(OFF_T "long")
-    set(SIZE_T "unsigned")
-endif(HAVE_SYS_TYPES_H)
+    check_c_source_compiles("
+        #include <sys/types.h>
+        int main(void) {
+            const off_t offset = -123;
+            (void)offset;
+            return 0;
+        }"
+        HAVE_OFF_T)
+endif()
+
+if(NOT HAVE_OFF_T)
+    set(off_t "long")
+endif()
 
 check_c_source_compiles("
+        #define _GNU_SOURCE
         #include <stdlib.h>  /* for NULL */
         #include <unistd.h>  /* for syscall */
         #include <sys/syscall.h>  /* for SYS_getrandom */
-        int main() {
+        int main(void) {
             syscall(SYS_getrandom, NULL, 0, 0);
             return 0;
         }"

Modules/ThirdParty/Expat/src/expat/ConfigureChecks.cmake

@@ -1,5 +1,8 @@
 /* expat_config.h.cmake.  Based upon generated expat_config.h.in.  */
 
+#ifndef EXPAT_CONFIG_H
+#  define EXPAT_CONFIG_H 1
+
 /* 1234 = LIL_ENDIAN, 4321 = BIGENDIAN */
 #cmakedefine BYTEORDER @BYTEORDER@
 
@@ -58,7 +61,7 @@
 #cmakedefine HAVE_UNISTD_H
 
 /* Name of package */
-#define PACKAGE "@PACKAGE_NAME@"
+#  define PACKAGE "@PACKAGE_NAME@"
 
 /* Define to the address where bug reports for this package should be sent. */
 #cmakedefine PACKAGE_BUGREPORT "@PACKAGE_BUGREPORT@"
@@ -73,13 +76,15 @@
 #cmakedefine PACKAGE_TARNAME "@PACKAGE_TARNAME@"
 
 /* Define to the home page for this package. */
-#define PACKAGE_URL ""
+#  define PACKAGE_URL ""
 
 /* Define to the version of this package. */
 #cmakedefine PACKAGE_VERSION "@PACKAGE_VERSION@"
 
 /* Define to 1 if you have the ANSI C header files. */
+#  ifndef STDC_HEADERS
 #cmakedefine STDC_HEADERS
+#  endif
 
 /* whether byteorder is bigendian */
 #cmakedefine WORDS_BIGENDIAN
@@ -89,27 +94,29 @@
 #cmakedefine XML_ATTR_INFO
 
 /* Define to specify how much context to retain around the current parse
-   point. */
-#cmakedefine XML_CONTEXT_BYTES @XML_CONTEXT_BYTES@
+   point, 0 to disable. */
+#  define XML_CONTEXT_BYTES @XML_CONTEXT_BYTES@
 
-#if ! defined(_WIN32)
+#  if ! defined(_WIN32)
 /* Define to include code reading entropy from `/dev/urandom'. */
-  #cmakedefine XML_DEV_URANDOM
-#endif
+#cmakedefine XML_DEV_URANDOM
+#  endif
 
 /* Define to make parameter entity parsing functionality available. */
 #cmakedefine XML_DTD
 
+/* Define as 1/0 to enable/disable support for general entities. */
+#  define XML_GE @XML_GE@
+
 /* Define to make XML Namespaces functionality available. */
 #cmakedefine XML_NS
 
 /* Define to __FUNCTION__ or "" if `__func__' does not conform to ANSI C. */
-#ifdef _MSC_VER
-#  define __func__ __FUNCTION__
-#endif
+#  ifdef _MSC_VER
+#    define __func__ __FUNCTION__
+#  endif
 
 /* Define to `long' if <sys/types.h> does not define. */
-#cmakedefine off_t @OFF_T@
+#cmakedefine off_t @off_t@
 
-/* Define to `unsigned' if <sys/types.h> does not define. */
-#cmakedefine size_t @SIZE_T@
+#endif // ndef EXPAT_CONFIG_H

Modules/ThirdParty/Expat/src/expat/expatConfig.h.in

@@ -31,12 +31,14 @@ nm libITKEXPAT-5.3.a | grep " [TRD] " |  awk '{ print $3 }' | sort -df | awk '{
 
 */
 
+#define g_reparseDeferralEnabledDefault @MANGLE_PREFIX@_g_reparseDeferralEnabledDefault
 #define _INTERNAL_trim_to_complete_utf8_characters @MANGLE_PREFIX@__INTERNAL_trim_to_complete_utf8_characters
 #define testingAccountingGetCountBytesDirect @MANGLE_PREFIX@_testingAccountingGetCountBytesDirect
 #define testingAccountingGetCountBytesIndirect @MANGLE_PREFIX@_testingAccountingGetCountBytesIndirect
 #define unsignedCharToPrintable @MANGLE_PREFIX@_unsignedCharToPrintable
 #define XML_DefaultCurrent @MANGLE_PREFIX@_XML_DefaultCurrent
 #define XML_ErrorString @MANGLE_PREFIX@_XML_ErrorString
+#define XML_ExpatVersionInfo @MANGLE_PREFIX@_XML_ExpatVersionInfo
 #define XML_ExpatVersion @MANGLE_PREFIX@_XML_ExpatVersion
 #define XML_ExpatVersionInfo @MANGLE_PREFIX@_XML_ExpatVersionInfo
 #define XML_ExternalEntityParserCreate @MANGLE_PREFIX@_XML_ExternalEntityParserCreate
@@ -64,6 +66,7 @@ nm libITKEXPAT-5.3.a | grep " [TRD] " |  awk '{ print $3 }' | sort -df | awk '{
 #define XML_MemFree @MANGLE_PREFIX@_XML_MemFree
 #define XML_MemMalloc @MANGLE_PREFIX@_XML_MemMalloc
 #define XML_MemRealloc @MANGLE_PREFIX@_XML_MemRealloc
+#define XML_ParseBuffer @MANGLE_PREFIX@_XML_ParseBuffer
 #define XML_Parse @MANGLE_PREFIX@_XML_Parse
 #define XML_ParseBuffer @MANGLE_PREFIX@_XML_ParseBuffer
 #define XML_ParserCreate @MANGLE_PREFIX@_XML_ParserCreate
@@ -73,16 +76,20 @@ nm libITKEXPAT-5.3.a | grep " [TRD] " |  awk '{ print $3 }' | sort -df | awk '{
 #define XML_ParserReset @MANGLE_PREFIX@_XML_ParserReset
 #define XmlParseXmlDecl @MANGLE_PREFIX@_XmlParseXmlDecl
 #define XmlParseXmlDeclNS @MANGLE_PREFIX@_XmlParseXmlDeclNS
+#define XmlPrologStateInitExternalEntity @MANGLE_PREFIX@_XmlPrologStateInitExternalEntity
 #define XmlPrologStateInit @MANGLE_PREFIX@_XmlPrologStateInit
 #define XmlPrologStateInitExternalEntity @MANGLE_PREFIX@_XmlPrologStateInitExternalEntity
 #define XML_ResumeParser @MANGLE_PREFIX@_XML_ResumeParser
+#define XML_SetAllocTrackerActivationThreshold @MANGLE_PREFIX@_XML_SetAllocTrackerActivationThreshold
+#define XML_SetAllocTrackerMaximumAmplification @MANGLE_PREFIX@_XML_SetAllocTrackerMaximumAmplification
 #define XML_SetAttlistDeclHandler @MANGLE_PREFIX@_XML_SetAttlistDeclHandler
 #define XML_SetBase @MANGLE_PREFIX@_XML_SetBase
 #define XML_SetBillionLaughsAttackProtectionActivationThreshold @MANGLE_PREFIX@_XML_SetBillionLaughsAttackProtectionActivationThreshold
 #define XML_SetBillionLaughsAttackProtectionMaximumAmplification @MANGLE_PREFIX@_XML_SetBillionLaughsAttackProtectionMaximumAmplification
 #define XML_SetCdataSectionHandler @MANGLE_PREFIX@_XML_SetCdataSectionHandler
 #define XML_SetCharacterDataHandler @MANGLE_PREFIX@_XML_SetCharacterDataHandler
 #define XML_SetCommentHandler @MANGLE_PREFIX@_XML_SetCommentHandler
+#define XML_SetDefaultHandlerExpand @MANGLE_PREFIX@_XML_SetDefaultHandlerExpand
 #define XML_SetDefaultHandler @MANGLE_PREFIX@_XML_SetDefaultHandler
 #define XML_SetDefaultHandlerExpand @MANGLE_PREFIX@_XML_SetDefaultHandlerExpand
 #define XML_SetDoctypeDeclHandler @MANGLE_PREFIX@_XML_SetDoctypeDeclHandler
@@ -94,6 +101,7 @@ nm libITKEXPAT-5.3.a | grep " [TRD] " |  awk '{ print $3 }' | sort -df | awk '{
 #define XML_SetEndElementHandler @MANGLE_PREFIX@_XML_SetEndElementHandler
 #define XML_SetEndNamespaceDeclHandler @MANGLE_PREFIX@_XML_SetEndNamespaceDeclHandler
 #define XML_SetEntityDeclHandler @MANGLE_PREFIX@_XML_SetEntityDeclHandler
+#define XML_SetExternalEntityRefHandlerArg @MANGLE_PREFIX@_XML_SetExternalEntityRefHandlerArg
 #define XML_SetExternalEntityRefHandler @MANGLE_PREFIX@_XML_SetExternalEntityRefHandler
 #define XML_SetExternalEntityRefHandlerArg @MANGLE_PREFIX@_XML_SetExternalEntityRefHandlerArg
 #define XML_SetHashSalt @MANGLE_PREFIX@_XML_SetHashSalt
@@ -102,6 +110,7 @@ nm libITKEXPAT-5.3.a | grep " [TRD] " |  awk '{ print $3 }' | sort -df | awk '{
 #define XML_SetNotStandaloneHandler @MANGLE_PREFIX@_XML_SetNotStandaloneHandler
 #define XML_SetParamEntityParsing @MANGLE_PREFIX@_XML_SetParamEntityParsing
 #define XML_SetProcessingInstructionHandler @MANGLE_PREFIX@_XML_SetProcessingInstructionHandler
+#define XML_SetReparseDeferralEnabled @MANGLE_PREFIX@_XML_SetReparseDeferralEnabled
 #define XML_SetReturnNSTriplet @MANGLE_PREFIX@_XML_SetReturnNSTriplet
 #define XML_SetSkippedEntityHandler @MANGLE_PREFIX@_XML_SetSkippedEntityHandler
 #define XML_SetStartCdataSectionHandler @MANGLE_PREFIX@_XML_SetStartCdataSectionHandler
@@ -118,5 +127,4 @@ nm libITKEXPAT-5.3.a | grep " [TRD] " |  awk '{ print $3 }' | sort -df | awk '{
 #define XML_UseParserAsHandlerArg @MANGLE_PREFIX@_XML_UseParserAsHandlerArg
 #define XmlUtf16Encode @MANGLE_PREFIX@_XmlUtf16Encode
 #define XmlUtf8Encode @MANGLE_PREFIX@_XmlUtf8Encode
-
 #endif /* itk_expat_mangle_h */