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/**
* Copyright (c) 2017 rxi
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MIT license. See `microtar.c` for details.
*/
#include <stdio.h>
#include <string.h>
#include "microtar.h"
static int file_write(mtar_t *tar, const void *data, unsigned size) {
unsigned res = fwrite(data, 1, size, tar->stream);
return (res == size) ? MTAR_ESUCCESS : MTAR_EWRITEFAIL;
}
static int file_read(mtar_t *tar, void *data, unsigned size) {
unsigned res = fread(data, 1, size, tar->stream);
return (res == size) ? MTAR_ESUCCESS : MTAR_EREADFAIL;
}
static int file_seek(mtar_t *tar, unsigned offset) {
int res = fseek(tar->stream, offset, SEEK_SET);
return (res == 0) ? MTAR_ESUCCESS : MTAR_ESEEKFAIL;
}
static int file_close(mtar_t *tar) {
fclose(tar->stream);
return MTAR_ESUCCESS;
}
int mtar_open(mtar_t *tar, const char *filename, const char *mode) {
int err;
mtar_header_t h;
/* Init tar struct and functions */
memset(tar, 0, sizeof(*tar));
tar->write = file_write;
tar->read = file_read;
tar->seek = file_seek;
tar->close = file_close;
/* Assure mode is always binary */
if ( strchr(mode, 'r') ) mode = "rb";
if ( strchr(mode, 'w') ) mode = "wb";
if ( strchr(mode, 'a') ) mode = "ab";
/* Open file */
tar->stream = fopen(filename, mode);
if (!tar->stream) {
return MTAR_EOPENFAIL;
}
/* Read first header to check it is valid if mode is `r` */
if (*mode == 'r') {
err = mtar_read_header(tar, &h);
if (err != MTAR_ESUCCESS) {
mtar_close(tar);
return err;
}
}
/* Return ok */
return MTAR_ESUCCESS;
}
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