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android: Use correct encoding when converting strings

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The JNI functions that have "UTF" their name use "modified UTF-8"
rather than the standard UTF-8 that Citra uses, at least according
to Oracle's documentation, so it is incorrect for us to use them.
This change fixes the problem by converting between UTF-8 and
UTF-16 manually instead of letting JNI do it for us.
This commit is contained in:
JosJuice 2022-08-03 15:44:51 +02:00
parent 87677be921
commit ce07ef1821
4 changed files with 25 additions and 14 deletions
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22
src/android/app/src/main/jni/android_common/android_common.cpp
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@ -5,20 +5,28 @@
#include "jni/android_common/android_common.h"
#include <string>
#include <string_view>
#include <jni.h>
std::string GetJString(JNIEnv *env, jstring jstr) {
#include "common/string_util.h"
std::string GetJString(JNIEnv* env, jstring jstr) {
if (!jstr) {
return {};
}
const char *s = env->GetStringUTFChars(jstr, nullptr);
std::string result = s;
env->ReleaseStringUTFChars(jstr, s);
return result;
const jchar* jchars = env->GetStringChars(jstr, nullptr);
const jsize length = env->GetStringLength(jstr);
const std::u16string_view string_view(reinterpret_cast<const char16_t*>(jchars), length);
const std::string converted_string = Common::UTF16ToUTF8(string_view);
env->ReleaseStringChars(jstr, jchars);
return converted_string;
}
jstring ToJString(JNIEnv* env, const std::string& str) {
return env->NewStringUTF(str.c_str());
jstring ToJString(JNIEnv* env, std::string_view str) {
const std::u16string converted_string = Common::UTF8ToUTF16(str);
return env->NewString(reinterpret_cast<const jchar*>(converted_string.data()),
static_cast<jint>(converted_string.size()));
}

2
src/android/app/src/main/jni/android_common/android_common.h
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@ -9,4 +9,4 @@
#include <jni.h>
std::string GetJString(JNIEnv* env, jstring jstr);
jstring ToJString(JNIEnv* env, const std::string& str);
jstring ToJString(JNIEnv* env, std::string_view str);

10
src/common/string_util.cpp
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@ -8,6 +8,8 @@
#include <cstdlib>
#include <locale>
#include <sstream>
#include <string>
#include <string_view>
#include "common/common_paths.h"
#include "common/logging/log.h"
#include "common/string_util.h"
@ -135,14 +137,14 @@ std::string ReplaceAll(std::string result, const std::string& src, const std::st
return result;
}
std::string UTF16ToUTF8(const std::u16string& input) {
std::string UTF16ToUTF8(std::u16string_view input) {
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
return convert.to_bytes(input);
return convert.to_bytes(input.data(), input.data() + input.size());
}
std::u16string UTF8ToUTF16(const std::string& input) {
std::u16string UTF8ToUTF16(std::string_view input) {
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
return convert.from_bytes(input);
return convert.from_bytes(input.data(), input.data() + input.size());
}
#ifdef _WIN32

5
src/common/string_util.h
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@ -7,6 +7,7 @@
#include <algorithm>
#include <cstddef>
#include <string>
#include <string_view>
#include <vector>
#include "common/common_types.h"
#include "common/swap.h"
@ -37,8 +38,8 @@ void BuildCompleteFilename(std::string& _CompleteFilename, const std::string& _P
[[nodiscard]] std::string ReplaceAll(std::string result, const std::string& src,
const std::string& dest);
[[nodiscard]] std::string UTF16ToUTF8(const std::u16string& input);
[[nodiscard]] std::u16string UTF8ToUTF16(const std::string& input);
[[nodiscard]] std::string UTF16ToUTF8(std::u16string_view input);
[[nodiscard]] std::u16string UTF8ToUTF16(std::string_view input);
#ifdef _WIN32
[[nodiscard]] std::string UTF16ToUTF8(const std::wstring& input);