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#pragma once
#include "macros.h"
#include <library/cpp/yson_pull/output.h>
#include <util/system/types.h>
#include <cstddef>
#include <cstring>
namespace NYsonPull {
namespace NDetail {
template <class StreamCounter>
class byte_writer {
NYsonPull::NOutput::IStream& stream_;
StreamCounter stream_counter_;
public:
byte_writer(NYsonPull::NOutput::IStream& stream)
: stream_(stream)
{
}
// const-ness added to prevent direct stream mutation
const NYsonPull::NOutput::IStream& stream() {
return stream_;
}
const StreamCounter& counter() {
return stream_counter_;
}
void flush_buffer() {
stream_.flush_buffer();
}
void advance(size_t bytes) {
auto& buf = stream_.buffer();
stream_counter_.update(
buf.pos(),
buf.pos() + bytes);
buf.advance(bytes);
}
void write(ui8 c) {
auto& buf = stream_.buffer();
if (Y_LIKELY(!buf.is_full())) {
*buf.pos() = c;
advance(1);
} else {
auto ptr = reinterpret_cast<char*>(&c);
stream_counter_.update(&c, &c + 1);
stream_.flush_buffer({ptr, 1});
}
}
void write(const ui8* data, size_t size) {
auto& buf = stream_.buffer();
auto free_buf = buf.available();
if (Y_LIKELY(size < free_buf)) {
::memcpy(buf.pos(), data, size);
advance(size);
} else {
if (!buf.is_full()) {
::memcpy(buf.pos(), data, free_buf);
advance(free_buf);
data += free_buf;
size -= free_buf;
}
stream_counter_.update(data, data + size);
stream_.flush_buffer({reinterpret_cast<const char*>(data),
size});
}
}
};
}
}
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