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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cmUVStreambuf_h
#define cmUVStreambuf_h
#include <algorithm>
#include <cstring>
#include <streambuf>
#include <vector>
#include "cm_uv.h"
#include "cmUVHandlePtr.h"
/*
* This file is based on example code from:
*
* http://www.voidcn.com/article/p-vjnlygmc-gy.html
*
* The example code was distributed under the following license:
*
* Copyright 2007 Edd Dawson.
* Distributed under the Boost Software License, Version 1.0.
*
* Boost Software License - Version 1.0 - August 17th, 2003
*
* Permission is hereby granted, free of charge, to any person or organization
* obtaining a copy of the software and accompanying documentation covered by
* this license (the "Software") to use, reproduce, display, distribute,
* execute, and transmit the Software, and to prepare derivative works of the
* Software, and to permit third-parties to whom the Software is furnished to
* do so, all subject to the following:
*
* The copyright notices in the Software and this entire statement, including
* the above license grant, this restriction and the following disclaimer,
* must be included in all copies of the Software, in whole or in part, and
* all derivative works of the Software, unless such copies or derivative
* works are solely in the form of machine-executable object code generated by
* a source language processor.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
template <typename CharT, typename Traits = std::char_traits<CharT>>
class cmBasicUVStreambuf : public std::basic_streambuf<CharT, Traits>
{
public:
cmBasicUVStreambuf(std::size_t bufSize = 256, std::size_t putBack = 8);
~cmBasicUVStreambuf() override;
bool is_open() const;
cmBasicUVStreambuf* open(uv_stream_t* stream);
cmBasicUVStreambuf* close();
protected:
typename cmBasicUVStreambuf<CharT, Traits>::int_type underflow() override;
std::streamsize showmanyc() override;
// FIXME: Add write support
private:
uv_stream_t* Stream = nullptr;
void* OldStreamData = nullptr;
const std::size_t PutBack = 0;
std::vector<CharT> InputBuffer;
bool EndOfFile = false;
void StreamReadStartStop();
void StreamRead(ssize_t nread);
void HandleAlloc(uv_buf_t* buf);
};
template <typename CharT, typename Traits>
cmBasicUVStreambuf<CharT, Traits>::cmBasicUVStreambuf(std::size_t bufSize,
std::size_t putBack)
: PutBack(std::max<std::size_t>(putBack, 1))
, InputBuffer(std::max<std::size_t>(this->PutBack, bufSize) + this->PutBack)
{
this->close();
}
template <typename CharT, typename Traits>
cmBasicUVStreambuf<CharT, Traits>::~cmBasicUVStreambuf()
{
this->close();
}
template <typename CharT, typename Traits>
bool cmBasicUVStreambuf<CharT, Traits>::is_open() const
{
return this->Stream != nullptr;
}
template <typename CharT, typename Traits>
cmBasicUVStreambuf<CharT, Traits>* cmBasicUVStreambuf<CharT, Traits>::open(
uv_stream_t* stream)
{
this->close();
this->Stream = stream;
this->EndOfFile = false;
if (this->Stream) {
this->OldStreamData = this->Stream->data;
this->Stream->data = this;
}
this->StreamReadStartStop();
return this;
}
template <typename CharT, typename Traits>
cmBasicUVStreambuf<CharT, Traits>* cmBasicUVStreambuf<CharT, Traits>::close()
{
if (this->Stream) {
uv_read_stop(this->Stream);
this->Stream->data = this->OldStreamData;
}
this->Stream = nullptr;
CharT* readEnd = this->InputBuffer.data() + this->InputBuffer.size();
this->setg(readEnd, readEnd, readEnd);
return this;
}
template <typename CharT, typename Traits>
typename cmBasicUVStreambuf<CharT, Traits>::int_type
cmBasicUVStreambuf<CharT, Traits>::underflow()
{
if (!this->is_open()) {
return Traits::eof();
}
if (this->gptr() < this->egptr()) {
return Traits::to_int_type(*this->gptr());
}
this->StreamReadStartStop();
while (this->in_avail() == 0) {
uv_run(this->Stream->loop, UV_RUN_ONCE);
}
if (this->in_avail() == -1) {
return Traits::eof();
}
return Traits::to_int_type(*this->gptr());
}
template <typename CharT, typename Traits>
std::streamsize cmBasicUVStreambuf<CharT, Traits>::showmanyc()
{
if (!this->is_open() || this->EndOfFile) {
return -1;
}
return 0;
}
template <typename CharT, typename Traits>
void cmBasicUVStreambuf<CharT, Traits>::StreamReadStartStop()
{
if (this->Stream) {
uv_read_stop(this->Stream);
if (this->gptr() >= this->egptr()) {
uv_read_start(
this->Stream,
[](uv_handle_t* handle, size_t /* unused */, uv_buf_t* buf) {
auto streambuf =
static_cast<cmBasicUVStreambuf<CharT, Traits>*>(handle->data);
streambuf->HandleAlloc(buf);
},
[](uv_stream_t* stream2, ssize_t nread, const uv_buf_t* /* unused */) {
auto streambuf =
static_cast<cmBasicUVStreambuf<CharT, Traits>*>(stream2->data);
streambuf->StreamRead(nread);
});
}
}
}
template <typename CharT, typename Traits>
void cmBasicUVStreambuf<CharT, Traits>::HandleAlloc(uv_buf_t* buf)
{
auto size = this->egptr() - this->gptr();
std::memmove(this->InputBuffer.data(), this->gptr(),
this->egptr() - this->gptr());
this->setg(this->InputBuffer.data(), this->InputBuffer.data(),
this->InputBuffer.data() + size);
buf->base = this->egptr();
#ifdef _WIN32
# define BUF_LEN_TYPE ULONG
#else
# define BUF_LEN_TYPE size_t
#endif
buf->len = BUF_LEN_TYPE(
(this->InputBuffer.data() + this->InputBuffer.size() - this->egptr()) *
sizeof(CharT));
#undef BUF_LEN_TYPE
}
template <typename CharT, typename Traits>
void cmBasicUVStreambuf<CharT, Traits>::StreamRead(ssize_t nread)
{
if (nread > 0) {
this->setg(this->eback(), this->gptr(),
this->egptr() + nread / sizeof(CharT));
uv_read_stop(this->Stream);
} else if (nread < 0 /*|| nread == UV_EOF*/) {
this->EndOfFile = true;
uv_read_stop(this->Stream);
}
}
using cmUVStreambuf = cmBasicUVStreambuf<char>;
#endif
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