1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217
|
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#pragma once
#include <algorithm>
#include <cstring>
#include <streambuf>
#include <vector>
#include <cm3p/uv.h>
#include "cmUVHandlePtr.h"
/*
* This file is based on example code from:
*
* https://web.archive.org/web/20170515211805/
* http://www.mr-edd.co.uk/blog/beginners_guide_streambuf
*
* 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>;
|