Thank you for explanation!
2016-06-03 9:42 GMT+03:00 Jochen Eisinger <joc...@chromium.org>:
> Your input string is encoded as CESU-8, not UTF-8. Older versions of V8
> would silently accept that encoding, however, this leads to broken behavior
> when interacting with libraries actually expecting UTF-8, so we changed our
> implementation to actually require UTF-8, and invalid characters are
> replaced when converting the string to our internal utf-16 representation.
>
> Roman Budnyjj <budn...@gmail.com> schrieb am Do., 2. Juni 2016, 20:44:
>
>> Hi guys,
>> I'm trying to pass some string data to the JS functions, managed by V8.
>> These strings are UTF8-encoded and contain surrogate pairs (Emoji).
>> I've found, that for some reason new versions (5.1.281.56) of library
>> modify these strings, so
>> the contents of strings after conversion to std types back are not the
>> same, as it was initially:
>>
>> #include <include/v8.h>
>>
>> #include <include/libplatform/libplatform.h>
>>
>> #include <fcntl.h>
>> #include <stdio.h>
>> #include <stdlib.h>
>> #include <string.h>
>> #include <string>
>>
>>
>> class SampleArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
>> public:
>> virtual void* Allocate(size_t length) {
>> void* data = AllocateUninitialized(length);
>> return data == NULL ? data : memset(data, 0, length);
>> }
>> virtual void* AllocateUninitialized(size_t length) { return
>> malloc(length); }
>> virtual void Free(void* data, size_t) { free(data); }
>> };
>>
>> int main(int argc, char* argv[]) {
>> v8::V8::InitializeICU();
>> v8::V8::InitializeExternalStartupData(argv[0]);
>> v8::Platform* platform = v8::platform::CreateDefaultPlatform();
>> v8::V8::InitializePlatform(platform);
>> v8::V8::Initialize();
>> v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
>> SampleArrayBufferAllocator array_buffer_allocator;
>> v8::Isolate::CreateParams create_params;
>> create_params.array_buffer_allocator = &array_buffer_allocator;
>> v8::Isolate* isolate = v8::Isolate::New(create_params);
>> {
>> v8::Isolate::Scope isolate_scope(isolate);
>> v8::HandleScope handle_scope(isolate);
>> // v8::Local<v8::Context> context = CreateShellContext(isolate);
>>
>> // \uD83C\uDC32\
>> std::string src("\355\240\274\355\260\262");
>> std::string dst =
>> *v8::String::Utf8Value(
>> v8::String::NewFromUtf8(
>> isolate, src.c_str(),
>> v8::NewStringType::kNormal).ToLocalChecked());
>> if (src != dst) {
>> printf("!\n");
>> }
>> }
>>
>> return 0;
>> }
>>
>> Both on my x64 machine and android-19 (ARM) it prints "!".
>> I also want to mention, that on older versions of V8 (3.27.34) this
>> string stays unmodified.
>> Could you please describe the reasons of such behavior?
>>
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