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Annotation of embedaddon/php/ext/zip/lib/zip_filerange_crc.c, revision 1.1

1.1     ! misho       1: /*
        !             2:   zip_filerange_crc.c -- compute CRC32 for a range of a file
        !             3:   Copyright (C) 2008-2009 Dieter Baron and Thomas Klausner
        !             4: 
        !             5:   This file is part of libzip, a library to manipulate ZIP archives.
        !             6:   The authors can be contacted at <libzip@nih.at>
        !             7: 
        !             8:   Redistribution and use in source and binary forms, with or without
        !             9:   modification, are permitted provided that the following conditions
        !            10:   are met:
        !            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
        !            15:      the documentation and/or other materials provided with the
        !            16:      distribution.
        !            17:   3. The names of the authors may not be used to endorse or promote
        !            18:      products derived from this software without specific prior
        !            19:      written permission.
        !            20:  
        !            21:   THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
        !            22:   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        !            23:   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
        !            25:   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
        !            27:   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
        !            28:   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
        !            29:   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
        !            30:   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
        !            31:   IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            32: */
        !            33: 
        !            34: 
        !            35: 
        !            36: #include <stdio.h>
        !            37: #include <errno.h>
        !            38: 
        !            39: #include "zipint.h"
        !            40: 
        !            41: 
        !            42: 
        !            43: 
        !            44: int
        !            45: _zip_filerange_crc(FILE *fp, off_t start, off_t len, uLong *crcp,
        !            46:                   struct zip_error *errp)
        !            47: {
        !            48:     Bytef buf[BUFSIZE];
        !            49:     size_t n;
        !            50: 
        !            51:     *crcp = crc32(0L, Z_NULL, 0);
        !            52: 
        !            53:     if (fseeko(fp, start, SEEK_SET) != 0) {
        !            54:        _zip_error_set(errp, ZIP_ER_SEEK, errno);
        !            55:        return -1;
        !            56:     }
        !            57:     
        !            58:     while (len > 0) {
        !            59:        n = len > BUFSIZE ? BUFSIZE : len;
        !            60:        if ((n=fread(buf, 1, n, fp)) <= 0) {
        !            61:            _zip_error_set(errp, ZIP_ER_READ, errno);
        !            62:            return -1;
        !            63:        }
        !            64: 
        !            65:        *crcp = crc32(*crcp, buf, n);
        !            66: 
        !            67:        len-= n;
        !            68:     }
        !            69: 
        !            70:     return 0;
        !            71: }