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Annotation of src/usr.bin/gzsig/gzip.h, Revision 1.1

1.1     ! marius      1: /*
        !             2:  * gzip.h
        !             3:  *
        !             4:  * Copyright (c) 2001 Dug Song <dugsong@arbor.net>
        !             5:  * Copyright (c) 2001 Arbor Networks, Inc.
        !             6:  *
        !             7:  *   Redistribution and use in source and binary forms, with or without
        !             8:  *   modification, are permitted provided that the following conditions
        !             9:  *   are met:
        !            10:  *
        !            11:  *   1. Redistributions of source code must retain the above copyright
        !            12:  *      notice, this list of conditions and the following disclaimer.
        !            13:  *   2. Redistributions in binary form must reproduce the above copyright
        !            14:  *      notice, this list of conditions and the following disclaimer in the
        !            15:  *      documentation and/or other materials provided with the distribution.
        !            16:  *   3. The names of the copyright holders may not be used to endorse or
        !            17:  *      promote products derived from this software without specific
        !            18:  *      prior written permission.
        !            19:  *
        !            20:  *   THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
        !            21:  *   INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
        !            22:  *   AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
        !            23:  *   THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
        !            24:  *   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
        !            25:  *   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
        !            26:  *   OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
        !            27:  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
        !            28:  *   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
        !            29:  *   ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            30:  *
        !            31:  * $Id: gzip.h,v 1.2 2005/04/01 16:47:31 dugsong Exp $
        !            32:  */
        !            33:
        !            34: #ifndef GZIP_H
        !            35: #define GZIP_H
        !            36:
        !            37: /* RFC 1952 is b0rked! This is from gzip-1.2.4's algorithm.doc... */
        !            38:
        !            39: /* Magic header */
        !            40: #define GZIP_MAGIC             "\037\213"
        !            41:
        !            42: /* Compression methods */
        !            43: #define GZIP_MSTORED           0
        !            44: #define GZIP_MCOMPRESS         1
        !            45: #define GZIP_MPACKED           2
        !            46: #define GZIP_MLZHED            3
        !            47: #define GZIP_MDEFLATE          8
        !            48:
        !            49: /* Flags */
        !            50: #define GZIP_FTEXT             0x01
        !            51: #define GZIP_FCONT             0x02    /* never set by gzip-1.2.4 */
        !            52: #define GZIP_FEXTRA            0x04
        !            53: #define GZIP_FNAME             0x08
        !            54: #define GZIP_FCOMMENT          0x10
        !            55: #define GZIP_FENCRYPT          0x20
        !            56: #define GZIP_FRESERVED         0xC0
        !            57:
        !            58: #define GZIP_FENCRYPT_LEN      12
        !            59:
        !            60: #define GZSIG_ID               "GS"
        !            61: #define GZSIG_VERSION          1
        !            62:
        !            63: struct gzsig_data {
        !            64:        u_char  version;
        !            65: #ifdef COMMENT_ONLY
        !            66:        u_char  signature[];
        !            67: #endif
        !            68: };
        !            69:
        !            70: /*
        !            71:  * Note: all number fields below are in little-endian byte order.
        !            72:  */
        !            73:
        !            74: struct gzip_xfield {
        !            75:        u_short len;
        !            76:        struct gzip_subfield {
        !            77:                u_char  id[2];
        !            78:                u_short len;
        !            79: #ifdef COMMENT_ONLY
        !            80:                u_char  data[];
        !            81: #endif
        !            82:        } subfield;
        !            83: };
        !            84:
        !            85: struct gzip_header {
        !            86:        u_char          magic[2];
        !            87:        u_char          method;
        !            88:        u_char          flags;
        !            89:        u_char          mtime[4];
        !            90:        u_char          xflags;
        !            91:        u_char          os;
        !            92: #if COMMENT_ONLY
        !            93:        /* Optional fields */
        !            94:        u_char          part[2];                /* flags & GZIP_FCONT */
        !            95:        struct gzip_xfield xfield;              /* flags & GZIP_FEXTRA */
        !            96:        char            filename[];             /* flags & GZIP_FNAME */
        !            97:        char            comment[];              /* flags & GZIP_FCOMMENT */
        !            98:        u_char          encrypt_hdr[12];        /* flags & GZIP_FENCRYPT */
        !            99: #endif
        !           100: };
        !           101:
        !           102: struct gzip_trailer {
        !           103:        u_int32_t       crc32[4];
        !           104:        u_int32_t       size[4];
        !           105: };
        !           106:
        !           107: #endif /* GZIP_H */