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// Copyright 2014 the V8 project 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 "src/snapshot-source-sink.h"
#include "src/base/logging.h"
#include "src/handles-inl.h"
#include "src/serialize.h" // for SerializerDeserializer::nop() in AtEOF()
namespace v8 {
namespace internal {
int32_t SnapshotByteSource::GetUnalignedInt() {
DCHECK(position_ < length_); // Require at least one byte left.
int32_t answer = data_[position_];
answer |= data_[position_ + 1] << 8;
answer |= data_[position_ + 2] << 16;
answer |= data_[position_ + 3] << 24;
return answer;
}
void SnapshotByteSource::CopyRaw(byte* to, int number_of_bytes) {
MemCopy(to, data_ + position_, number_of_bytes);
position_ += number_of_bytes;
}
void SnapshotByteSink::PutInt(uintptr_t integer, const char* description) {
DCHECK(integer < 1 << 30);
integer <<= 2;
int bytes = 1;
if (integer > 0xff) bytes = 2;
if (integer > 0xffff) bytes = 3;
if (integer > 0xffffff) bytes = 4;
integer |= (bytes - 1);
Put(static_cast<int>(integer & 0xff), "IntPart1");
if (bytes > 1) Put(static_cast<int>((integer >> 8) & 0xff), "IntPart2");
if (bytes > 2) Put(static_cast<int>((integer >> 16) & 0xff), "IntPart3");
if (bytes > 3) Put(static_cast<int>((integer >> 24) & 0xff), "IntPart4");
}
void SnapshotByteSink::PutRaw(const byte* data, int number_of_bytes,
const char* description) {
data_.AddAll(Vector<byte>(const_cast<byte*>(data), number_of_bytes));
}
bool SnapshotByteSource::AtEOF() {
if (0u + length_ - position_ > 2 * sizeof(uint32_t)) return false;
for (int x = position_; x < length_; x++) {
if (data_[x] != SerializerDeserializer::nop()) return false;
}
return true;
}
bool SnapshotByteSource::GetBlob(const byte** data, int* number_of_bytes) {
int size = GetInt();
*number_of_bytes = size;
if (position_ + size <= length_) {
*data = &data_[position_];
Advance(size);
return true;
} else {
Advance(length_ - position_); // proceed until end.
return false;
}
}
} // namespace v8::internal
} // namespace v8
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