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/*
* stream.c - streaming I/O implementation
*
* Copyright (C) 2019 Emmanuel Marty
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
/*
* Uses the libdivsufsort library Copyright (c) 2003-2008 Yuta Mori
*
* Inspired by LZ4 by Yann Collet. https://github.com/lz4/lz4
* With help, ideas, optimizations and speed measurements by spke <zxintrospec@gmail.com>
* With ideas from Lizard by Przemyslaw Skibinski and Yann Collet. https://github.com/inikep/lizard
* Also with ideas from smallz4 by Stephan Brumme. https://create.stephan-brumme.com/smallz4/
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "stream.h"
/**
* Close file stream
*
* @param stream stream
*/
static void lzsa_filestream_close(lzsa_stream_t *stream) {
if (stream->obj) {
fclose((FILE*)stream->obj);
stream->obj = NULL;
stream->read = NULL;
stream->write = NULL;
stream->eof = NULL;
stream->close = NULL;
}
}
/**
* Read from file stream
*
* @param stream stream
* @param ptr buffer to read into
* @param size number of bytes to read
*
* @return number of bytes read
*/
static size_t lzsa_filestream_read(lzsa_stream_t *stream, void *ptr, size_t size) {
return fread(ptr, 1, size, (FILE*)stream->obj);
}
/**
* Write to file stream
*
* @param stream stream
* @param ptr buffer to write from
* @param size number of bytes to write
*
* @return number of bytes written
*/
static size_t lzsa_filestream_write(lzsa_stream_t *stream, void *ptr, size_t size) {
return fwrite(ptr, 1, size, (FILE*)stream->obj);
}
/**
* Check if file stream has reached the end of the data
*
* @param stream stream
*
* @return nonzero if the end of the data has been reached, 0 if there is more data
*/
static int lzsa_filestream_eof(lzsa_stream_t *stream) {
return feof((FILE*)stream->obj);
}
/**
* Open file and create an I/O stream from it
*
* @param stream stream to fill out
* @param pszInFilename filename
* @param pszMode open mode, as with fopen()
*
* @return 0 for success, nonzero for failure
*/
int lzsa_filestream_open(lzsa_stream_t *stream, const char *pszInFilename, const char *pszMode) {
stream->obj = (void*)fopen(pszInFilename, pszMode);
if (stream->obj) {
stream->read = lzsa_filestream_read;
stream->write = lzsa_filestream_write;
stream->eof = lzsa_filestream_eof;
stream->close = lzsa_filestream_close;
return 0;
}
else
return -1;
}
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