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#include "buffer.h"
#include <util/generic/buffer.h>
class TBufferOutput::TImpl {
public:
inline TImpl(TBuffer& buf)
: Data_(buf)
{
}
virtual ~TImpl() = default;
inline size_t DoNext(void** ptr) {
if (Data_.Avail() == 0) {
Data_.Reserve(FastClp2(Data_.Capacity() + MinBufferGrowSize));
}
size_t previousSize = Data_.size();
Data_.Resize(Data_.Capacity());
*ptr = Data_.Begin() + previousSize;
return Data_.Size() - previousSize;
}
inline void DoUndo(size_t len) {
Y_ABORT_UNLESS(len <= Data_.Size(), "trying to undo more bytes than actually written");
Data_.Resize(Data_.size() - len);
}
inline void DoWrite(const void* buf, size_t len) {
Data_.Append((const char*)buf, len);
}
inline void DoWriteC(char c) {
Data_.Append(c);
}
inline TBuffer& Buffer() const noexcept {
return Data_;
}
private:
TBuffer& Data_;
static constexpr size_t MinBufferGrowSize = 16;
};
namespace {
using TImpl = TBufferOutput::TImpl;
class TOwnedImpl: private TBuffer, public TImpl {
public:
inline TOwnedImpl(size_t buflen)
: TBuffer(buflen)
, TImpl(static_cast<TBuffer&>(*this))
{
}
};
}
TBufferOutput::TBufferOutput(size_t buflen)
: Impl_(new TOwnedImpl(buflen))
{
}
TBufferOutput::TBufferOutput(TBuffer& buffer)
: Impl_(new TImpl(buffer))
{
}
TBufferOutput::TBufferOutput(TBufferOutput&&) noexcept = default;
TBufferOutput& TBufferOutput::operator=(TBufferOutput&&) noexcept = default;
TBufferOutput::~TBufferOutput() = default;
TBuffer& TBufferOutput::Buffer() const noexcept {
return Impl_->Buffer();
}
size_t TBufferOutput::DoNext(void** ptr) {
return Impl_->DoNext(ptr);
}
void TBufferOutput::DoUndo(size_t len) {
Impl_->DoUndo(len);
}
void TBufferOutput::DoWrite(const void* buf, size_t len) {
Impl_->DoWrite(buf, len);
}
void TBufferOutput::DoWriteC(char c) {
Impl_->DoWriteC(c);
}
TBufferInput::TBufferInput(const TBuffer& buffer)
: Buf_(buffer)
, Readed_(0)
{
}
TBufferInput::~TBufferInput() = default;
const TBuffer& TBufferInput::Buffer() const noexcept {
return Buf_;
}
void TBufferInput::Rewind() noexcept {
Readed_ = 0;
}
size_t TBufferInput::DoNext(const void** ptr, size_t len) {
len = Min(Buf_.Size() - Readed_, len);
*ptr = Buf_.data() + Readed_;
Readed_ += len;
return len;
}
void TBufferInput::DoUndo(size_t len) {
Y_ABORT_UNLESS(len <= Readed_);
Readed_ -= len;
}
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