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/*
* Copyright (C) 2014-2018 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "BufferedOutputStream.hxx"
#include "OutputStream.hxx"
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#ifdef _UNICODE
#include "system/Error.hxx"
#include <windows.h>
#endif
bool
BufferedOutputStream::AppendToBuffer(const void *data, size_t size) noexcept
{
auto r = buffer.Write();
if (r.size < size)
return false;
memcpy(r.data, data, size);
buffer.Append(size);
return true;
}
void
BufferedOutputStream::Write(const void *data, size_t size)
{
/* try to append to the current buffer */
if (AppendToBuffer(data, size))
return;
/* not enough room in the buffer - flush it */
Flush();
/* see if there's now enough room */
if (AppendToBuffer(data, size))
return;
/* too large for the buffer: direct write */
os.Write(data, size);
}
void
BufferedOutputStream::Write(const char *p)
{
Write(p, strlen(p));
}
void
BufferedOutputStream::Format(const char *fmt, ...)
{
auto r = buffer.Write();
if (r.empty()) {
Flush();
r = buffer.Write();
}
/* format into the buffer */
va_list ap;
va_start(ap, fmt);
size_t size = vsnprintf(r.data, r.size, fmt, ap);
va_end(ap);
if (gcc_unlikely(size >= r.size)) {
/* buffer was not large enough; flush it and try
again */
Flush();
r = buffer.Write();
if (gcc_unlikely(size >= r.size)) {
/* still not enough space: grow the buffer and
try again */
r.size = size + 1;
r.data = buffer.Write(r.size);
}
/* format into the new buffer */
va_start(ap, fmt);
size = vsnprintf(r.data, r.size, fmt, ap);
va_end(ap);
/* this time, it must fit */
assert(size < r.size);
}
buffer.Append(size);
}
#ifdef _UNICODE
void
BufferedOutputStream::Write(const wchar_t *p)
{
WriteWideToUTF8(p, wcslen(p));
}
void
BufferedOutputStream::WriteWideToUTF8(const wchar_t *src, size_t src_length)
{
if (src_length == 0)
return;
auto r = buffer.Write();
if (r.empty()) {
Flush();
r = buffer.Write();
}
int length = WideCharToMultiByte(CP_UTF8, 0, src, src_length,
r.data, r.size, nullptr, nullptr);
if (length <= 0) {
const auto error = GetLastError();
if (error != ERROR_INSUFFICIENT_BUFFER)
throw MakeLastError(error, "UTF-8 conversion failed");
/* how much buffer do we need? */
length = WideCharToMultiByte(CP_UTF8, 0, src, src_length,
nullptr, 0, nullptr, nullptr);
if (length <= 0)
throw MakeLastError(error, "UTF-8 conversion failed");
/* grow the buffer and try again */
length = WideCharToMultiByte(CP_UTF8, 0, src, src_length,
buffer.Write(length), length,
nullptr, nullptr);
if (length <= 0)
throw MakeLastError(error, "UTF-8 conversion failed");
}
buffer.Append(length);
}
#endif
void
BufferedOutputStream::Flush()
{
auto r = buffer.Read();
if (r.empty())
return;
os.Write(r.data, r.size);
buffer.Consume(r.size);
}