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/*
Copyright (C) 2009 Her Majesty the Queen in Right of Canada (Communications
Research Center Canada)
Copyright (C) 2013 Matthias P. Braendli
http://mpb.li
Base class for all file and fifo-based inputs.
*/
/*
This file is part of CRC-DabMux.
CRC-DabMux 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 3 of the
License, or (at your option) any later version.
CRC-DabMux 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 CRC-DabMux. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inputs/Input.h"
#include <string>
#include <cstdlib>
#include <cstdio>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#ifndef _WIN32
# define O_BINARY 0
#endif
#ifdef HAVE_INPUT_FILE
int InputFile::Open()
{
fprintf(stderr, "Opening %s\n", m_filename.c_str());
this->file = open(this->m_filename.c_str(), O_RDONLY | O_BINARY);
if (this->file == -1) {
perror(m_filename.c_str());
return -1;
}
return 0;
}
/**
* This function replace the read function by trying many times a reading.
* It tries to read until all bytes are read. Very useful when reading from a
* pipe because sometimes 2 pass is necessary to read all bytes.
* @param file File descriptor.
* @param data Address of the buffer to write data into.
* @param size Number of bytes to read.
* @param tries Max number of tries to read.
* @return Same as read function:
* Nb of bytes read.
* -1 if error.
*/
long InputFile::ReadData(void* data, size_t size, unsigned int tries)
{
size_t result;
size_t offset = 0;
if (size == 0) return 0;
if (tries == 0) return 0;
result = read(file, data, size);
if (result == -1) {
if (errno == EAGAIN) {
return ReadData(data, size, tries - 1);
}
return -1;
}
offset = result;
size -= offset;
data = (char*)data + offset;
result = ReadData(data, size, tries - 1);
if (result == -1) {
return -1;
}
offset += result;
return offset;
}
int InputFile::Rewind()
{
return lseek(this->file, 0, SEEK_SET);
}
int InputFile::Close()
{
if (this->file != -1) {
close(this->file);
}
return 0;
}
#endif
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