CMake/Source/cmUVStream.h
2023-06-14 11:53:55 -04:00

141 lines
3.5 KiB
C++

/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#pragma once
#include <cassert>
#include <istream>
#include <cm3p/uv.h>
#include "cmUVHandlePtr.h"
#include "cmUVStreambuf.h"
template <typename CharT, typename Traits = std::char_traits<CharT>>
class cmBasicUVIStream : public std::basic_istream<CharT>
{
public:
cmBasicUVIStream();
cmBasicUVIStream(uv_stream_t* stream);
bool is_open() const;
void open(uv_stream_t* stream);
void close();
private:
cmBasicUVStreambuf<CharT, Traits> Buffer;
};
template <typename CharT, typename Traits>
cmBasicUVIStream<CharT, Traits>::cmBasicUVIStream()
: std::basic_istream<CharT, Traits>(&this->Buffer)
{
}
template <typename CharT, typename Traits>
cmBasicUVIStream<CharT, Traits>::cmBasicUVIStream(uv_stream_t* stream)
: cmBasicUVIStream()
{
this->open(stream);
}
template <typename CharT, typename Traits>
bool cmBasicUVIStream<CharT, Traits>::is_open() const
{
return this->Buffer.is_open();
}
template <typename CharT, typename Traits>
void cmBasicUVIStream<CharT, Traits>::open(uv_stream_t* stream)
{
this->Buffer.open(stream);
}
template <typename CharT, typename Traits>
void cmBasicUVIStream<CharT, Traits>::close()
{
this->Buffer.close();
}
using cmUVIStream = cmBasicUVIStream<char>;
template <typename CharT, typename Traits = std::char_traits<CharT>>
class cmBasicUVPipeIStream : public cmBasicUVIStream<CharT, Traits>
{
public:
cmBasicUVPipeIStream();
cmBasicUVPipeIStream(uv_loop_t& loop, int fd);
using cmBasicUVIStream<CharT, Traits>::is_open;
void open(uv_loop_t& loop, int fd);
void close();
private:
cm::uv_pipe_ptr Pipe;
};
template <typename CharT, typename Traits>
cmBasicUVPipeIStream<CharT, Traits>::cmBasicUVPipeIStream() = default;
template <typename CharT, typename Traits>
cmBasicUVPipeIStream<CharT, Traits>::cmBasicUVPipeIStream(uv_loop_t& loop,
int fd)
{
this->open(loop, fd);
}
template <typename CharT, typename Traits>
void cmBasicUVPipeIStream<CharT, Traits>::open(uv_loop_t& loop, int fd)
{
this->Pipe.init(loop, 0);
uv_pipe_open(this->Pipe, fd);
this->cmBasicUVIStream<CharT, Traits>::open(this->Pipe);
}
template <typename CharT, typename Traits>
void cmBasicUVPipeIStream<CharT, Traits>::close()
{
this->cmBasicUVIStream<CharT, Traits>::close();
this->Pipe.reset();
}
using cmUVPipeIStream = cmBasicUVPipeIStream<char>;
template <typename ReadCallback, typename FinishCallback>
void cmUVStreamRead(uv_stream_t* stream, ReadCallback onRead,
FinishCallback onFinish)
{
struct ReadData
{
std::vector<char> Buffer;
ReadCallback OnRead;
FinishCallback OnFinish;
};
stream->data = new ReadData{ {}, std::move(onRead), std::move(onFinish) };
uv_read_start(
stream,
[](uv_handle_t* s, std::size_t suggestedSize, uv_buf_t* buffer) {
auto* data = static_cast<ReadData*>(s->data);
data->Buffer.resize(suggestedSize);
buffer->base = data->Buffer.data();
buffer->len = suggestedSize;
},
[](uv_stream_t* s, ssize_t nread, const uv_buf_t* buffer) {
auto* data = static_cast<ReadData*>(s->data);
if (nread > 0) {
(void)buffer;
assert(buffer->base == data->Buffer.data());
data->Buffer.resize(nread);
data->OnRead(std::move(data->Buffer));
} else if (nread < 0 /*|| nread == UV_EOF*/) {
data->OnFinish();
uv_read_stop(s);
delete data;
}
});
}