Fix Windows CI stack buffer overrun (0xc0000409)

- Reduce GRK_PATH_LEN from 4096 to 1024 (Windows MAX_PATH is 260;
  1024 is sufficient for extended paths)
- Heap-allocate grk_cparameters, grk_decompress_parameters, and
  grk_stream_params in GrkLRUCacheTest to eliminate ~96KB stack frames
  that trigger VS 2026 /GS security cookie violations
- Add GRK_ENABLE_ASAN CMake option; enable on Windows CI for precise
  buffer overrun diagnostics

Author: Grok Compression

.github/workflows/build.yml

@@ -94,7 +94,9 @@ jobs:
       # and build directories, but this is only available with CMake 3.13 and higher.
       # The CMake binaries on the Github Actions machines are (as of this writing) 3.12
       run: |
-        if [[ "${{ matrix.os }}" != "ubuntu-latest" ]]; then
+        if [[ "${{ matrix.os }}" == "windows-latest" ]]; then
+          cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DBUILD_SHARED_LIBS=${{ matrix.shared_libs_flag }} -DBUILD_TESTING:BOOL=ON -DGRK_DATA_ROOT=$DATA_ROOT -DGRK_ENABLE_LIBCURL=OFF -DGRK_ENABLE_ASAN=ON $GENERATOR_PLATFORM
+        elif [[ "${{ matrix.os }}" != "ubuntu-latest" ]]; then
           cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DBUILD_SHARED_LIBS=${{ matrix.shared_libs_flag }} -DBUILD_TESTING:BOOL=ON -DGRK_DATA_ROOT=$DATA_ROOT -DGRK_ENABLE_LIBCURL=OFF $GENERATOR_PLATFORM
         else
           cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DBUILD_SHARED_LIBS=${{ matrix.shared_libs_flag }} -DBUILD_TESTING:BOOL=ON -DGRK_DATA_ROOT=$DATA_ROOT -DGRK_ENABLE_LIBCURL=ON $GENERATOR_PLATFORM

CMakeLists.txt

@@ -81,6 +81,18 @@ if(CMAKE_CXX_LINK_PIE_SUPPORTED)
   set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
 endif()
 
+# AddressSanitizer support
+option(GRK_ENABLE_ASAN "Enable AddressSanitizer (ASan) for detecting memory errors" OFF)
+if(GRK_ENABLE_ASAN)
+  if(MSVC)
+    add_compile_options(/fsanitize=address)
+    # MSVC ASan does not require link flags; the runtime is linked automatically.
+  else()
+    add_compile_options(-fsanitize=address -fno-omit-frame-pointer)
+    add_link_options(-fsanitize=address)
+  endif()
+endif()
+
 add_compile_options(
   $<$<AND:$<COMPILE_LANGUAGE:C,CXX>,$<CONFIG:RelWithDebInfo>>:-fno-omit-frame-pointer>)
 add_link_options(

src/lib/core/grok.h

@@ -324,7 +324,7 @@ typedef enum _GRK_CODEC_FORMAT
   GRK_CODEC_MJ2 /** Motion JPEG 2000 */
 } GRK_CODEC_FORMAT;
 
-#define GRK_PATH_LEN 4096 /* Grok maximum supported filename size */
+#define GRK_PATH_LEN 1024 /* Grok maximum supported filename size */
 #define GRK_MAX_LAYERS 256 /* Grok maximum number of quality layers */
 
 /*