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att
GitHub Repository: att/ast
 Path: blob/master/src/cmd/pax/pax-gzip.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1987-2012 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * pax gzip format

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 */

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#include "format.h"

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static int

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gzip_getprologue(Pax_t* pax, Format_t* fp, Archive_t* ap, File_t* f, unsigned char* buf, size_t size)

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{

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	off_t		pos;

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	unsigned char	num[4];

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	if (size < 2 || buf[0] != 0x1f || buf[1] != 0x8b)

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		return 0;

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	if ((pos = lseek(ap->io->fd, (off_t)0, SEEK_CUR)) < 0 || lseek(ap->io->fd, (off_t)-4, SEEK_END) <= 0 || read(ap->io->fd, num, sizeof(num)) != sizeof(num))

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		ap->uncompressed = ap->io->size * 6;

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	else

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		ap->uncompressed = (num[0]) |

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				   (num[1] << 8) |

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				   (num[2] << 16) |

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				   (num[3] << 24);

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	lseek(ap->io->fd, pos, SEEK_SET);

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	return 1;

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}

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static Compress_format_t	pax_gzip_data =

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{

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	"-9",

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	{ "gunzip" },

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	{ "ratz", "-c" },

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};

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Format_t	pax_gzip_format =

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{

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	"gzip",

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	"gz",

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	"gzip compression",

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	0,

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	COMPRESS|IN|OUT,

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	0,

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	0,

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	0,

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	PAXNEXT(gzip),

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	&pax_gzip_data,

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	0,

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	gzip_getprologue,

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};

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PAXLIB(gzip)

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