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/*
* Copyright 2003-2018 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "BufferedReader.hxx"
#include "Reader.hxx"
#include "util/TextFile.hxx"
#include <stdexcept>
#include <stdint.h>
#include <string.h>
bool
BufferedReader::Fill(bool need_more)
{
if (eof)
return !need_more;
auto w = buffer.Write();
if (w.empty()) {
if (buffer.GetCapacity() >= MAX_SIZE)
return !need_more;
buffer.Grow(buffer.GetCapacity() * 2);
w = buffer.Write();
assert(!w.empty());
}
size_t nbytes = reader.Read(w.data, w.size);
if (nbytes == 0) {
eof = true;
return !need_more;
}
buffer.Append(nbytes);
return true;
}
void *
BufferedReader::ReadFull(size_t size)
{
while (true) {
auto r = Read();
if (r.size >= size)
return r.data;
if (!Fill(true))
throw std::runtime_error("Premature end of file");
}
}
size_t
BufferedReader::ReadFromBuffer(WritableBuffer<void> dest) noexcept
{
auto src = Read();
size_t nbytes = std::min(src.size, dest.size);
memcpy(dest.data, src.data, nbytes);
Consume(nbytes);
return nbytes;
}
void
BufferedReader::ReadFull(WritableBuffer<void> _dest)
{
auto dest = WritableBuffer<uint8_t>::FromVoid(_dest);
assert(dest.size == _dest.size);
while (true) {
size_t nbytes = ReadFromBuffer(dest.ToVoid());
dest.skip_front(nbytes);
if (dest.size == 0)
break;
if (!Fill(true))
throw std::runtime_error("Premature end of file");
}
}
char *
BufferedReader::ReadLine()
{
do {
char *line = ReadBufferedLine(buffer);
if (line != nullptr) {
++line_number;
return line;
}
} while (Fill(true));
if (!eof || buffer.empty())
return nullptr;
auto w = buffer.Write();
if (w.empty()) {
buffer.Grow(buffer.GetCapacity() + 1);
w = buffer.Write();
assert(!w.empty());
}
/* terminate the last line */
w[0] = 0;
char *line = buffer.Read().data;
buffer.Clear();
++line_number;
return line;
}
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