68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*
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* Copyright (C) 2001-2003 Hewlett-Packard Co.
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* Contributed by Stephane Eranian <eranian@hpl.hp.com>
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*
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* This file is part of the ELILO, the EFI Linux boot loader.
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*
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* ELILO is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* ELILO is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with ELILO; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*
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* Please check out the elilo.txt for complete documentation on how
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* to use this program.
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*/
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#ifndef __GZIP_H__
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#define __GZIP_H__
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int gunzip_image(memdesc_t *);
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int gunzip_kernel(fops_fd_t, kdesc_t *);
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/* gzip flag byte */
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#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
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#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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#define COMMENT 0x10 /* bit 4 set: file comment present */
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#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
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#define RESERVED 0xC0 /* bit 6,7: reserved */
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/*
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* check for valid gzip signature
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* return:
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* 0 : valid gzip archive
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* -1: invalid gzip archive
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*/
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static inline int
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gzip_probe(unsigned char *buf, unsigned long size)
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{
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if (size < 4) return -1;
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if (buf[0] != 037 ||
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((buf[1] != 0213) && (buf[1] != 0236))) return -1;
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/* We only support method #8, DEFLATED */
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if (buf[2] != 8) return -1;
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if ((buf[3] & ENCRYPTED) != 0) return -1;
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if ((buf[3] & CONTINUATION) != 0) return -1;
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if ((buf[3] & RESERVED) != 0) return -1;
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return 0;
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}
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#endif /* __GZIP_H__ */
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