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/*------------------------------------------------------------------------------
* Copyright (C) 2003-2006 Jos van den Oever
*
* Distributable under the terms of either the Apache License (Version 2.0) or
* the GNU Lesser General Public License, as specified in the COPYING file.
------------------------------------------------------------------------------*/
/* This file is part of Strigi Desktop Search
*
* Copyright (C) 2006 Jos van den Oever <jos@vandenoever.info>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "jstreamsconfig.h"
#include "fileinputstream.h"
#include <cerrno>
#include <cstring>
namespace jstreams {
const int32_t FileInputStream::defaultBufferSize = 1048576;
FileInputStream::FileInputStream(const char *filepath, int32_t buffersize) {
// try to open the file for reading
file = fopen(filepath, "rb");
this->filepath = filepath;
if (file == 0) {
// handle error
error = "Could not read file '";
error += filepath;
error += "': ";
error += strerror(errno);
status = Error;
return;
}
// determine file size. if the stream is not seekable, the size will be -1
fseek(file, 0, SEEK_END);
size = ftell(file);
fseek(file, 0, SEEK_SET);
// if the file has size 0, make sure that it's really empty
// this is useful for filesystems like /proc that report files as size 0
// for files that do contain content
if (size == 0) {
char dummy[1];
size_t n = fread(dummy, 1, 1, file);
if (n == 1) {
size = -1;
fseek(file, 0, SEEK_SET);
} else {
fclose(file);
file = 0;
return;
}
}
// allocate memory in the buffer
int32_t bufsize = (size <= buffersize) ?size+1 :buffersize;
mark(bufsize);
}
FileInputStream::~FileInputStream() {
if (file) {
if (fclose(file)) {
// handle error
error = "Could not close file '" + filepath + "'.";
}
}
}
int32_t
FileInputStream::fillBuffer(char* start, int32_t space) {
if (file == 0) return -1;
// read into the buffer
int32_t nwritten = fread(start, 1, space, file);
// check the file stream status
if (ferror(file)) {
error = "Could not read from file '" + filepath + "'.";
fclose(file);
file = 0;
status = Error;
return -1;
}
if (feof(file)) {
fclose(file);
file = 0;
}
return nwritten;
}
}
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