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9a19360398
This is an MIT-licensed library for reading and writing v7 format tar files. The version here is my fork, which fixes security issues in the original code (it hasn't been updated in 4 years, probably abandoned by the author). Change-Id: I86d41423dacc46e9fa0514b4fc7386a96c216e86
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2021 Aidan MacDonald
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "file.h"
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#include "microtar.h"
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#include <stdint.h>
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static int fd_write(mtar_t *tar, const void *data, unsigned size) {
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intptr_t fd = (intptr_t)tar->stream;
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ssize_t res = write(fd, data, size);
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if(res < 0 || ((unsigned)res != size))
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return MTAR_EWRITEFAIL;
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else
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return MTAR_ESUCCESS;
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}
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static int fd_read(mtar_t *tar, void *data, unsigned size) {
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intptr_t fd = (intptr_t)tar->stream;
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ssize_t res = read(fd, data, size);
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if(res < 0 || ((unsigned)res != size))
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return MTAR_EREADFAIL;
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else
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return MTAR_ESUCCESS;
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}
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static int fd_seek(mtar_t *tar, unsigned offset) {
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intptr_t fd = (intptr_t)tar->stream;
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off_t res = lseek(fd, offset, SEEK_SET);
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if(res < 0 || ((unsigned)res != offset))
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return MTAR_ESEEKFAIL;
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else
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return MTAR_ESUCCESS;
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}
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static int fd_close(mtar_t *tar) {
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intptr_t fd = (intptr_t)tar->stream;
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close(fd);
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return MTAR_ESUCCESS;
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}
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int mtar_open(mtar_t *tar, const char *filename, const char *mode) {
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int err;
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int openmode;
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int fd;
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/* Init tar struct and functions */
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memset(tar, 0, sizeof(*tar));
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tar->write = fd_write;
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tar->read = fd_read;
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tar->seek = fd_seek;
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tar->close = fd_close;
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/* Get correct mode flags */
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if ( strchr(mode, 'r') )
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openmode = O_RDONLY;
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else if ( strchr(mode, 'w') )
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openmode = O_CREAT|O_TRUNC|O_WRONLY;
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else if ( strchr(mode, 'a') )
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openmode = O_WRONLY|O_APPEND;
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else
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return MTAR_EFAILURE;
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/* Open file */
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fd = open(filename, openmode);
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if(fd < 0)
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return MTAR_EOPENFAIL;
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tar->stream = (void*)(intptr_t)fd;
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/* Read first header to check it is valid if mode is `r` */
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if ( openmode & O_RDONLY ) {
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err = mtar_read_header(tar, &tar->header);
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if (err != MTAR_ESUCCESS) {
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mtar_close(tar);
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return err;
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}
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}
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/* Return ok */
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return MTAR_ESUCCESS;
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}
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