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Force the JVM to use UTF-8 on Windows
This change patches the app manifest of the `java.exe` launcher in the embedded JDK to always use the UTF-8 codepage on Windows 1903 and later. This is necessary because the launcher sets sun.jnu.encoding to the system code page, which by default is a legacy code page such as Cp1252 on Windows. This causes the JVM to be unable to interact with files whose paths contain Unicode characters not representable in the system code page, as well as command-line arguments and environment variables containing such characters. The Windows VMs in CI are not running Windows 1903 or later yet, so this change can currently only be tested locally by running `bazel info character-encoding` and verifying that it prints `sun.jnu.encoding = UTF-8`. Work towards bazelbuild#374 Work towards bazelbuild#18293 Work towards bazelbuild#23859 Closes bazelbuild#24172. PiperOrigin-RevId: 693466466 Change-Id: I4914c21e846493a8880ac8c6f5e1afa9fae87366
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| // Copyright 2024 The Bazel Authors. All rights reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| #include <stdio.h> | ||
| #include <stdlib.h> | ||
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| #define WIN32_LEAN_AND_MEAN | ||
| #include <windows.h> | ||
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| #include <string> | ||
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| // This program patches the app manifest of the java.exe launcher to force its | ||
| // active code page to UTF-8 on Windows 1903 and later. | ||
| // https://learn.microsoft.com/en-us/windows/apps/design/globalizing/use-utf8-code-page#set-a-process-code-page-to-utf-8 | ||
| // | ||
| // This is necessary because the launcher sets sun.jnu.encoding to the system | ||
| // code page, which by default is a legacy code page such as Cp1252 on Windows. | ||
| // This causes the JVM to be unable to interact with files whose paths contain | ||
| // Unicode characters not representable in the system code page, as well as | ||
| // command-line arguments and environment variables containing such characters. | ||
| // | ||
| // Usage in the libjava.dll code: | ||
| // https://github.com/openjdk/jdk/blob/e7f0bf11ff0e89b6b156d5e88ca3771c706aa46a/src/java.base/windows/native/libjava/java_props_md.c#L63-L65 | ||
| int wmain(int argc, wchar_t *argv[]) { | ||
| if (argc != 2) { | ||
| fwprintf(stderr, L"Usage: %ls <filename>\n", argv[0]); | ||
| return 1; | ||
| } | ||
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| // Read the app manifest (aka side-by-side or fusion manifest) from the | ||
| // executable, which requires loading it as a "module". | ||
| HMODULE exe = LoadLibraryExW(argv[1], nullptr, LOAD_LIBRARY_AS_DATAFILE); | ||
| if (!exe) { | ||
| fwprintf(stderr, L"Error loading file %ls: %d\n", argv[1], GetLastError()); | ||
| return 1; | ||
| } | ||
| HRSRC manifest_resource = FindResourceA(exe, MAKEINTRESOURCE(1), RT_MANIFEST); | ||
| if (!manifest_resource) { | ||
| fwprintf(stderr, L"Resource not found: %d\n", GetLastError()); | ||
| return 1; | ||
| } | ||
| HGLOBAL manifest_handle = LoadResource(exe, manifest_resource); | ||
| if (!manifest_handle) { | ||
| fwprintf(stderr, L"Error loading resource: %d\n", GetLastError()); | ||
| return 1; | ||
| } | ||
| LPVOID manifest_data = LockResource(manifest_handle); | ||
| if (!manifest_data) { | ||
| fwprintf(stderr, L"Error locking resource: %d\n", GetLastError()); | ||
| return 1; | ||
| } | ||
| DWORD manifest_len = SizeofResource(exe, manifest_resource); | ||
| std::string manifest((char *)manifest_data, manifest_len); | ||
| UnlockResource(manifest_handle); | ||
| FreeResource(manifest_handle); | ||
| FreeLibrary(exe); | ||
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| // Insert the activeCodePage element into the manifest at the end of the | ||
| // windowsSettings element. | ||
| // https://github.com/openjdk/jdk/blob/29882bfe7b7e76446a96862cd0a5e81c7e054415/src/java.base/windows/native/launcher/java.manifest#L43 | ||
| std::size_t insert_pos = manifest.find("</asmv3:windowsSettings>"); | ||
| if (insert_pos == std::wstring::npos) { | ||
| fwprintf(stderr, L"End tag not found in manifest:\n%hs", manifest.c_str()); | ||
| return 1; | ||
| } | ||
| std::string new_manifest = manifest.substr(0, insert_pos) + | ||
| "<activeCodePage " | ||
| "xmlns=\"http://schemas.microsoft.com/SMI/2019/" | ||
| "WindowsSettings\">UTF-8</activeCodePage>" + | ||
| manifest.substr(insert_pos); | ||
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| // Write back the modified app manifest. | ||
| HANDLE update_handle = BeginUpdateResourceW(argv[1], false); | ||
| if (!update_handle) { | ||
| fwprintf(stderr, L"Error opening file %ls for update: %d\n", argv[1], | ||
| GetLastError()); | ||
| return 1; | ||
| } | ||
| if (!UpdateResourceA(update_handle, RT_MANIFEST, MAKEINTRESOURCE(1), | ||
| MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL), | ||
| const_cast<char *>(new_manifest.c_str()), | ||
| new_manifest.size())) { | ||
| fwprintf(stderr, L"Error updating resource: %d\n", GetLastError()); | ||
| return 1; | ||
| } | ||
| if (!EndUpdateResourceW(update_handle, false)) { | ||
| fwprintf(stderr, L"Error finalizing update: %d\n", GetLastError()); | ||
| return 1; | ||
| } | ||
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||
| return 0; | ||
| } |
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