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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/compression/deflate_transformer.h"
#include <string.h>
#include <algorithm>
#include <limits>
#include "third_party/blink/renderer/bindings/core/v8/array_buffer_or_array_buffer_view.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_binding_for_core.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_uint8_array.h"
#include "third_party/blink/renderer/core/streams/transform_stream_default_controller.h"
#include "third_party/blink/renderer/core/streams/transform_stream_transformer.h"
#include "third_party/blink/renderer/core/typed_arrays/array_buffer_view_helpers.h"
#include "third_party/blink/renderer/modules/compression/compression_format.h"
#include "third_party/blink/renderer/modules/compression/zlib_partition_alloc.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/bindings/to_v8.h"
#include "v8/include/v8.h"
namespace blink {
DeflateTransformer::DeflateTransformer(ScriptState* script_state,
CompressionFormat format,
int level)
: script_state_(script_state), out_buffer_(kBufferSize) {
DCHECK(level >= 1 && level <= 9);
memset(&stream_, 0, sizeof(z_stream));
ZlibPartitionAlloc::Configure(&stream_);
constexpr int kWindowBits = 15;
constexpr int kUseGzip = 16;
int err;
switch (format) {
case CompressionFormat::kDeflate:
err = deflateInit2(&stream_, level, Z_DEFLATED, kWindowBits, 8,
Z_DEFAULT_STRATEGY);
break;
case CompressionFormat::kGzip:
err = deflateInit2(&stream_, level, Z_DEFLATED, kWindowBits + kUseGzip, 8,
Z_DEFAULT_STRATEGY);
break;
}
DCHECK_EQ(Z_OK, err);
}
DeflateTransformer::~DeflateTransformer() {
if (!was_flush_called_) {
deflateEnd(&stream_);
}
}
ScriptPromise DeflateTransformer::Transform(
v8::Local<v8::Value> chunk,
TransformStreamDefaultController* controller,
ExceptionState& exception_state) {
ArrayBufferOrArrayBufferView buffer_source;
V8ArrayBufferOrArrayBufferView::ToImpl(
script_state_->GetIsolate(), chunk, buffer_source,
UnionTypeConversionMode::kNotNullable, exception_state);
if (exception_state.HadException()) {
return ScriptPromise();
}
if (buffer_source.IsArrayBufferView()) {
const auto* view = buffer_source.GetAsArrayBufferView().View();
const uint8_t* start = static_cast<const uint8_t*>(view->BaseAddress());
size_t length = view->byteLengthAsSizeT();
if (length > std::numeric_limits<wtf_size_t>::max()) {
exception_state.ThrowRangeError(
"Buffer size exceeds maximum heap object size.");
return ScriptPromise();
}
Deflate(start, static_cast<wtf_size_t>(length), IsFinished(false),
controller, exception_state);
return ScriptPromise::CastUndefined(script_state_);
}
DCHECK(buffer_source.IsArrayBuffer());
const auto* array_buffer = buffer_source.GetAsArrayBuffer();
const uint8_t* start = static_cast<const uint8_t*>(array_buffer->Data());
size_t length = array_buffer->ByteLengthAsSizeT();
if (length > std::numeric_limits<wtf_size_t>::max()) {
exception_state.ThrowRangeError(
"Buffer size exceeds maximum heap object size.");
return ScriptPromise();
}
Deflate(start, static_cast<wtf_size_t>(length), IsFinished(false), controller,
exception_state);
return ScriptPromise::CastUndefined(script_state_);
}
ScriptPromise DeflateTransformer::Flush(
TransformStreamDefaultController* controller,
ExceptionState& exception_state) {
Deflate(nullptr, 0u, IsFinished(true), controller, exception_state);
was_flush_called_ = true;
deflateEnd(&stream_);
out_buffer_.clear();
return ScriptPromise::CastUndefined(script_state_);
}
void DeflateTransformer::Deflate(const uint8_t* start,
wtf_size_t length,
IsFinished finished,
TransformStreamDefaultController* controller,
ExceptionState& exception_state) {
stream_.avail_in = length;
// Zlib treats this pointer as const, so this cast is safe.
stream_.next_in = const_cast<uint8_t*>(start);
do {
stream_.avail_out = out_buffer_.size();
stream_.next_out = out_buffer_.data();
int err = deflate(&stream_, finished ? Z_FINISH : Z_NO_FLUSH);
DCHECK((finished && err == Z_STREAM_END) || err == Z_OK ||
err == Z_BUF_ERROR);
wtf_size_t bytes = out_buffer_.size() - stream_.avail_out;
if (bytes) {
controller->enqueue(
script_state_,
ScriptValue::From(script_state_,
DOMUint8Array::Create(out_buffer_.data(), bytes)),
exception_state);
if (exception_state.HadException()) {
return;
}
}
} while (stream_.avail_out == 0);
}
void DeflateTransformer::Trace(Visitor* visitor) {
visitor->Trace(script_state_);
TransformStreamTransformer::Trace(visitor);
}
} // namespace blink
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