ICU: Backport 79.1 commit that fixes non-assembly datafile

Author: Ghabry

emscripten/2_build_toolchain.sh

@@ -36,9 +36,14 @@ if [ ! -f .patches-applied ]; then
 	# (see https://groups.google.com/forum/#!topic/emscripten-discuss/YM3jC_qQoPk)
 	perl -pi -e 's/HAVE_ARC4RANDOM\)/NO_ARC4RANDOM\)/' $EXPAT_DIR/ConfigureChecks.cmake
 
+	# Fix ICU (Remove when 79.1 is released)
+	(cd $ICU_DIR
+		patch -Np2 < $SCRIPT_DIR/../shared/extra/icu-fix-data.patch
+	)
+
 	if [ "$USE_WASM_SIMD" == "1" ]; then
 		(cd $PIXMAN_DIR
-			patch -Np2 < ../pixman-wasm.patch
+			patch -Np2 < $SCRIPT_DIR/pixman-wasm.patch
 		)
 	fi
 

ios/2_build_toolchain.sh

@@ -22,6 +22,11 @@ if [ ! -f .patches-applied ]; then
 
 	patches_common
 
+	# Fix ICU (Remove when 79.1 is released)
+	(cd $ICU_DIR
+		patch -Np2 < $SCRIPT_DIR/../shared/extra/icu-fix-data.patch
+	)
+
 	touch .patches-applied
 fi
 

macos/2_build_toolchain.sh

@@ -22,6 +22,11 @@ if [ ! -f .patches-applied ]; then
 
 	patches_common
 
+	# Fix ICU (Remove when 79.1 is released)
+	(cd $ICU_DIR
+		patch -Np2 < $SCRIPT_DIR/../shared/extra/icu-fix-data.patch
+	)
+
 	touch .patches-applied
 fi
 

shared/extra/icu-fix-data.patch

@@ -0,0 +1,43 @@
+From aa17de1994d188560d99d07c37bf333416483899 Mon Sep 17 00:00:00 2001
+From: George Rhoten <grhoten@users.noreply.github.com>
+Date: Tue, 18 Nov 2025 15:47:24 -0800
+Subject: [PATCH] ICU-23263 Support shared/static data library that uses a
+ pointer based table of contents
+
+---
+ icu4c/source/common/ucnv_io.cpp | 7 ++++---
+ icu4c/source/configure          | 2 +-
+ icu4c/source/configure.ac       | 2 +-
+ 3 files changed, 6 insertions(+), 5 deletions(-)
+
+diff --git a/icu4c/source/common/ucnv_io.cpp b/icu4c/source/common/ucnv_io.cpp
+index 46a26f821fd8..66813f5a0372 100644
+--- a/icu4c/source/common/ucnv_io.cpp
++++ b/icu4c/source/common/ucnv_io.cpp
+@@ -249,14 +249,15 @@ static void U_CALLCONV initAliasData(UErrorCode &errCode) {
+ 
+     sectionSizes = static_cast<const uint32_t*>(udata_getMemory(data));
+     int32_t dataLength = udata_getLength(data); // This is the length minus the UDataInfo size
+-    if (dataLength <= int32_t(sizeof(sectionSizes[0]))) {
++    UBool isDataLengthKnown = dataLength >= 0; // Only false when using a pointer table of contents (not files nor a common data archive)
++    if (isDataLengthKnown && dataLength <= int32_t(sizeof(sectionSizes[0]))) {
+         // We don't even have a TOC!
+         goto invalidFormat;
+     }
+     table = reinterpret_cast<const uint16_t*>(sectionSizes);
+     tableStart = sectionSizes[0];
+     sizeOfTOC = int32_t((tableStart + 1) * sizeof(sectionSizes[0]));
+-    if (tableStart < minTocLength || dataLength <= sizeOfTOC) {
++    if (tableStart < minTocLength || (isDataLengthKnown && dataLength <= sizeOfTOC)) {
+         // We don't have a whole TOC!
+         goto invalidFormat;
+     }
+@@ -279,7 +280,7 @@ static void U_CALLCONV initAliasData(UErrorCode &errCode) {
+     for (uint32_t section = 1; section <= tableStart; section++) {
+         sizeOfData += sectionSizes[section] * sizeof(table[0]);
+     }
+-    if (dataLength < sizeOfData) {
++    if (isDataLengthKnown && dataLength < sizeOfData) {
+         // Truncated file!
+         goto invalidFormat;
+     }

tvos/2_build_toolchain.sh

@@ -22,6 +22,11 @@ if [ ! -f .patches-applied ]; then
 
 	patches_common
 
+	# Fix ICU (Remove when 79.1 is released)
+	(cd $ICU_DIR
+		patch -Np2 < $SCRIPT_DIR/../shared/extra/icu-fix-data.patch
+	)
+
 	touch .patches-applied
 fi