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src, i18n: cleanup usage of MaybeStackBuffer
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- Templatize AsBuffer() and create a generic version for inclusion in
  the Buffer class
- Use MaybeStackBuffer::storage()
- If possible, avoid double conversion in ToASCII()/ToUnicode()
- More descriptive assertion error in tests

PR-URL: #11464
Reviewed-By: Steven R Loomis <srloomis@us.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
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@TimothyGu @italoacasas
TimothyGu authored and italoacasas committed Feb 25, 2017
1 parent fb85f50 commit 39b0034
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Showing 3 changed files with 85 additions and 58 deletions.
110 changes: 54 additions & 56 deletions src/node_i18n.cc
View file
Original file line number Diff line number Diff line change
Expand Up @@ -72,37 +72,19 @@ using v8::Value;

namespace i18n {

const size_t kStorageSize = 1024;

// TODO(jasnell): This could potentially become a member of MaybeStackBuffer
// at some point in the future. Care would need to be taken with the
// MaybeStackBuffer<UChar> variant below.
MaybeLocal<Object> AsBuffer(Isolate* isolate,
MaybeStackBuffer<char>* buf,
size_t len) {
if (buf->IsAllocated()) {
MaybeLocal<Object> ret = Buffer::New(isolate, buf->out(), len);
if (!ret.IsEmpty()) buf->Release();
template <typename T>
MaybeLocal<Object> ToBufferEndian(Environment* env, MaybeStackBuffer<T>* buf) {
MaybeLocal<Object> ret = Buffer::New(env, buf);
if (ret.IsEmpty())
return ret;
}
return Buffer::Copy(isolate, buf->out(), len);
}

MaybeLocal<Object> AsBuffer(Isolate* isolate,
MaybeStackBuffer<UChar>* buf,
size_t len) {
char* dst = reinterpret_cast<char*>(**buf);
MaybeLocal<Object> ret;
if (buf->IsAllocated()) {
ret = Buffer::New(isolate, dst, len);
if (!ret.IsEmpty()) buf->Release();
} else {
ret = Buffer::Copy(isolate, dst, len);
}
if (!ret.IsEmpty() && IsBigEndian()) {
SPREAD_BUFFER_ARG(ret.ToLocalChecked(), buf);
SwapBytes16(buf_data, buf_length);
static_assert(sizeof(T) == 1 || sizeof(T) == 2,
"Currently only one- or two-byte buffers are supported");
if (sizeof(T) > 1 && IsBigEndian()) {
SPREAD_BUFFER_ARG(ret.ToLocalChecked(), retbuf);
SwapBytes16(retbuf_data, retbuf_length);
}

return ret;
}

Expand Down Expand Up @@ -138,14 +120,14 @@ void CopySourceBuffer(MaybeStackBuffer<UChar>* dest,
}
}

typedef MaybeLocal<Object> (*TranscodeFunc)(Isolate* isolate,
typedef MaybeLocal<Object> (*TranscodeFunc)(Environment* env,
const char* fromEncoding,
const char* toEncoding,
const char* source,
const size_t source_length,
UErrorCode* status);

MaybeLocal<Object> Transcode(Isolate* isolate,
MaybeLocal<Object> Transcode(Environment* env,
const char* fromEncoding,
const char* toEncoding,
const char* source,
Expand All @@ -162,12 +144,14 @@ MaybeLocal<Object> Transcode(Isolate* isolate,
ucnv_convertEx(to.conv, from.conv, &target, target + limit,
&source, source + source_length, nullptr, nullptr,
nullptr, nullptr, true, true, status);
if (U_SUCCESS(*status))
ret = AsBuffer(isolate, &result, target - &result[0]);
if (U_SUCCESS(*status)) {
result.SetLength(target - &result[0]);
ret = ToBufferEndian(env, &result);
}
return ret;
}

MaybeLocal<Object> TranscodeToUcs2(Isolate* isolate,
MaybeLocal<Object> TranscodeToUcs2(Environment* env,
const char* fromEncoding,
const char* toEncoding,
const char* source,
Expand All @@ -181,11 +165,11 @@ MaybeLocal<Object> TranscodeToUcs2(Isolate* isolate,
ucnv_toUChars(from.conv, *destbuf, length_in_chars,
source, source_length, status);
if (U_SUCCESS(*status))
ret = AsBuffer(isolate, &destbuf, length_in_chars);
ret = ToBufferEndian(env, &destbuf);
return ret;
}

MaybeLocal<Object> TranscodeFromUcs2(Isolate* isolate,
MaybeLocal<Object> TranscodeFromUcs2(Environment* env,
const char* fromEncoding,
const char* toEncoding,
const char* source,
Expand All @@ -200,37 +184,42 @@ MaybeLocal<Object> TranscodeFromUcs2(Isolate* isolate,
MaybeStackBuffer<char> destbuf(length_in_chars);
const uint32_t len = ucnv_fromUChars(to.conv, *destbuf, length_in_chars,
*sourcebuf, length_in_chars, status);
if (U_SUCCESS(*status))
ret = AsBuffer(isolate, &destbuf, len);
if (U_SUCCESS(*status)) {
destbuf.SetLength(len);
ret = ToBufferEndian(env, &destbuf);
}
return ret;
}

MaybeLocal<Object> TranscodeUcs2FromUtf8(Isolate* isolate,
MaybeLocal<Object> TranscodeUcs2FromUtf8(Environment* env,
const char* fromEncoding,
const char* toEncoding,
const char* source,
const size_t source_length,
UErrorCode* status) {
*status = U_ZERO_ERROR;
MaybeStackBuffer<UChar, kStorageSize> destbuf;
MaybeStackBuffer<UChar> destbuf;
int32_t result_length;
u_strFromUTF8(*destbuf, kStorageSize, &result_length,
u_strFromUTF8(*destbuf, destbuf.capacity(), &result_length,
source, source_length, status);
MaybeLocal<Object> ret;
if (U_SUCCESS(*status)) {
ret = AsBuffer(isolate, &destbuf, result_length * sizeof(**destbuf));
destbuf.SetLength(result_length);
ret = ToBufferEndian(env, &destbuf);
} else if (*status == U_BUFFER_OVERFLOW_ERROR) {
*status = U_ZERO_ERROR;
destbuf.AllocateSufficientStorage(result_length);
u_strFromUTF8(*destbuf, result_length, &result_length,
source, source_length, status);
if (U_SUCCESS(*status))
ret = AsBuffer(isolate, &destbuf, result_length * sizeof(**destbuf));
if (U_SUCCESS(*status)) {
destbuf.SetLength(result_length);
ret = ToBufferEndian(env, &destbuf);
}
}
return ret;
}

MaybeLocal<Object> TranscodeUtf8FromUcs2(Isolate* isolate,
MaybeLocal<Object> TranscodeUtf8FromUcs2(Environment* env,
const char* fromEncoding,
const char* toEncoding,
const char* source,
Expand All @@ -241,20 +230,21 @@ MaybeLocal<Object> TranscodeUtf8FromUcs2(Isolate* isolate,
const size_t length_in_chars = source_length / sizeof(UChar);
int32_t result_length;
MaybeStackBuffer<UChar> sourcebuf;
MaybeStackBuffer<char, kStorageSize> destbuf;
MaybeStackBuffer<char> destbuf;
CopySourceBuffer(&sourcebuf, source, source_length, length_in_chars);
u_strToUTF8(*destbuf, kStorageSize, &result_length,
u_strToUTF8(*destbuf, destbuf.capacity(), &result_length,
*sourcebuf, length_in_chars, status);
if (U_SUCCESS(*status)) {
ret = AsBuffer(isolate, &destbuf, result_length);
destbuf.SetLength(result_length);
ret = ToBufferEndian(env, &destbuf);
} else if (*status == U_BUFFER_OVERFLOW_ERROR) {
*status = U_ZERO_ERROR;
destbuf.AllocateSufficientStorage(result_length);
u_strToUTF8(*destbuf, result_length, &result_length, *sourcebuf,
length_in_chars, status);
if (U_SUCCESS(*status)) {
ret = Buffer::New(isolate, *destbuf, result_length);
destbuf.Release();
destbuf.SetLength(result_length);
ret = ToBufferEndian(env, &destbuf);
}
}
return ret;
Expand Down Expand Up @@ -320,7 +310,7 @@ void Transcode(const FunctionCallbackInfo<Value>&args) {
ABORT();
}

result = tfn(isolate, EncodingName(fromEncoding), EncodingName(toEncoding),
result = tfn(env, EncodingName(fromEncoding), EncodingName(toEncoding),
ts_obj_data, ts_obj_length, &status);
} else {
status = U_ILLEGAL_ARGUMENT_ERROR;
Expand Down Expand Up @@ -431,7 +421,7 @@ int32_t ToUnicode(MaybeStackBuffer<char>* buf,

int32_t len = uidna_nameToUnicodeUTF8(uidna,
input, length,
**buf, buf->length(),
**buf, buf->capacity(),
&info,
&status);

Expand All @@ -440,13 +430,17 @@ int32_t ToUnicode(MaybeStackBuffer<char>* buf,
buf->AllocateSufficientStorage(len);
len = uidna_nameToUnicodeUTF8(uidna,
input, length,
**buf, buf->length(),
**buf, buf->capacity(),
&info,
&status);
}

if (U_FAILURE(status))
if (U_FAILURE(status)) {
len = -1;
buf->SetLength(0);
} else {
buf->SetLength(len);
}

uidna_close(uidna);
return len;
Expand All @@ -465,7 +459,7 @@ int32_t ToASCII(MaybeStackBuffer<char>* buf,

int32_t len = uidna_nameToASCII_UTF8(uidna,
input, length,
**buf, buf->length(),
**buf, buf->capacity(),
&info,
&status);

Expand All @@ -474,13 +468,17 @@ int32_t ToASCII(MaybeStackBuffer<char>* buf,
buf->AllocateSufficientStorage(len);
len = uidna_nameToASCII_UTF8(uidna,
input, length,
**buf, buf->length(),
**buf, buf->capacity(),
&info,
&status);
}

if (U_FAILURE(status))
if (U_FAILURE(status)) {
len = -1;
buf->SetLength(0);
} else {
buf->SetLength(len);
}

uidna_close(uidna);
return len;
Expand Down
29 changes: 29 additions & 0 deletions src/node_internals.h
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Original file line number Diff line number Diff line change
Expand Up @@ -198,6 +198,35 @@ v8::MaybeLocal<v8::Object> New(Environment* env,
// because ArrayBufferAllocator::Free() deallocates it again with free().
// Mixing operator new and free() is undefined behavior so don't do that.
v8::MaybeLocal<v8::Object> New(Environment* env, char* data, size_t length);

// Construct a Buffer from a MaybeStackBuffer (and also its subclasses like
// Utf8Value and TwoByteValue).
// If |buf| is invalidated, an empty MaybeLocal is returned, and nothing is
// changed.
// If |buf| contains actual data, this method takes ownership of |buf|'s
// underlying buffer. However, |buf| itself can be reused even after this call,
// but its capacity, if increased through AllocateSufficientStorage, is not
// guaranteed to stay the same.
template <typename T>
static v8::MaybeLocal<v8::Object> New(Environment* env,
MaybeStackBuffer<T>* buf) {
v8::MaybeLocal<v8::Object> ret;
char* src = reinterpret_cast<char*>(buf->out());
const size_t len_in_bytes = buf->length() * sizeof(buf->out()[0]);

if (buf->IsAllocated())
ret = New(env, src, len_in_bytes);
else if (!buf->IsInvalidated())
ret = Copy(env, src, len_in_bytes);

if (ret.IsEmpty())
return ret;

if (buf->IsAllocated())
buf->Release();

return ret;
}
} // namespace Buffer

} // namespace node
Expand Down
4 changes: 2 additions & 2 deletions test/parallel/test-icu-transcode.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -22,9 +22,9 @@ const tests = {

for (const test in tests) {
const dest = buffer.transcode(orig, 'utf8', test);
assert.strictEqual(dest.length, tests[test].length);
assert.strictEqual(dest.length, tests[test].length, `utf8->${test} length`);
for (let n = 0; n < tests[test].length; n++)
assert.strictEqual(dest[n], tests[test][n]);
assert.strictEqual(dest[n], tests[test][n], `utf8->${test} char ${n}`);
}

{
Expand Down

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