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// Copyright 2019 The Chromium Authors
// 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 <algorithm>
#include <cstring>
#include <limits>
#include "base/compiler_specific.h"
#include "base/trace_event/typed_macros.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
#include "third_party/blink/renderer/bindings/core/v8/to_v8_traits.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_binding_for_core.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_typedefs.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_union_arraybuffer_arraybufferview.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/core/typed_arrays/dom_array_piece.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 "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);
UNSAFE_TODO(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;
case CompressionFormat::kDeflateRaw:
err = deflateInit2(&stream_, level, Z_DEFLATED, -kWindowBits, 8,
Z_DEFAULT_STRATEGY);
break;
}
DCHECK_EQ(Z_OK, err);
}
DeflateTransformer::~DeflateTransformer() {
if (!was_flush_called_) {
deflateEnd(&stream_);
}
}
ScriptPromise<IDLUndefined> DeflateTransformer::Transform(
v8::Local<v8::Value> chunk,
TransformStreamDefaultController* controller,
ExceptionState& exception_state) {
auto* buffer_source = V8BufferSource::Create(script_state_->GetIsolate(),
chunk, exception_state);
if (exception_state.HadException())
return EmptyPromise();
DOMArrayPiece array_piece(buffer_source);
if (array_piece.ByteLength() > std::numeric_limits<wtf_size_t>::max()) {
exception_state.ThrowRangeError(
"Buffer size exceeds maximum heap object size.");
return EmptyPromise();
}
Deflate(array_piece.Bytes(),
static_cast<wtf_size_t>(array_piece.ByteLength()), IsFinished(false),
controller, exception_state);
return ToResolvedUndefinedPromise(script_state_.Get());
}
ScriptPromise<IDLUndefined> 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 ToResolvedUndefinedPromise(script_state_.Get());
}
void DeflateTransformer::Deflate(const uint8_t* start,
wtf_size_t length,
IsFinished finished,
TransformStreamDefaultController* controller,
ExceptionState& exception_state) {
TRACE_EVENT("blink,devtools.timeline", "CompressionStream Deflate");
stream_.avail_in = length;
// Zlib treats this pointer as const, so this cast is safe.
stream_.next_in = const_cast<uint8_t*>(start);
// enqueue() may execute JavaScript which may invalidate the input buffer. So
// accumulate all the output before calling enqueue().
HeapVector<Member<DOMUint8Array>, 1u> buffers;
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) {
buffers.push_back(
DOMUint8Array::Create(base::span(out_buffer_).first(bytes)));
}
} while (stream_.avail_out == 0);
DCHECK_EQ(stream_.avail_in, 0u);
// JavaScript may be executed inside this loop, however it is safe because
// |buffers| is a local variable that JavaScript cannot modify.
for (DOMUint8Array* buffer : buffers) {
controller->enqueue(script_state_, ScriptValue::From(script_state_, buffer),
exception_state);
if (exception_state.HadException()) {
return;
}
}
}
void DeflateTransformer::Trace(Visitor* visitor) const {
visitor->Trace(script_state_);
TransformStreamTransformer::Trace(visitor);
}
} // namespace blink
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