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/* Copyright (c) 1998, 1999, 2003, 2004 Lance Arsenault, (GNU GPL (v2+))
*/
#include "config.h"
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <gtkmm.h>
#include "value_t.h"
#include "FileReader.h"
#include "errorStr.h"
#include "Globel.h"
FileReader::FileReader(const char *filename_in, FILE *file_in)
{
isFree = 0;
openedFile = 0;
file = NULL;
buffer = NULL;
bufferSize = 0;
in = 0;
out = 0;
error = 0;
// user end of file
endOfFile = 0;
// if end of file is set
_endOfFile = 0;
if(!file_in)
{
file = fopen(filename_in, "r");
if(!file)
{
snprintf(errorStr, ERRORSTR_LENGTH,
"quickplot ERROR: Failed to open file '%s' for reading: "
"system error number %d: %s.",
filename_in, errno, strerror(errno));
if(!opSilent)
opSpew << errorStr << std::endl;
error = 1;
endOfFile = 1;
return;
}
openedFile = 1;
}
else
file = file_in;
}
FileReader::~FileReader(void)
{
if(buffer)
{
free(buffer);
buffer = NULL;
bufferSize = 0;
}
if(file && openedFile)
{
fclose(file);
file = NULL;
openedFile = 0;
}
}
void FileReader::rewind(void)
{
out = 0;
endOfFile = 0;
}
void FileReader::freeRewind(void)
{
isFree = 1;
}
int FileReader::readChar(void)
{
if(isFree && in == out)
{
if(_endOfFile) return EOF;
// no longer buffered.
int i = fgetc(file);
if(i == EOF)
_endOfFile = endOfFile = 1;
//printf("%c", (char) i);
return i;
}
// enough data in the buffer.
else if(in > out)
{
//printf("%c", (char) buffer[out]);
return ((int) buffer[out++]);
}
else if(_endOfFile)
{
return EOF;
}
else // If need more data in the buffer.
{
// is the buffer big enough
if(in + 1 > bufferSize)
buffer = (unsigned char *)
realloc(buffer, sizeof(unsigned char)*(bufferSize += CHUNK));
int i = fgetc(file);
if(i == EOF)
{
_endOfFile = endOfFile = 1;
return EOF;
}
else
{
buffer[in++] = ((unsigned char) i);
out = in;
//printf("%c", (char) buffer[in-1]);
return i;
}
}
}
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