Return to zip_source_crc.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / php / ext / zip / lib

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

1.1     ! misho       1: /*
        !             2:   zip_source_crc.c -- pass-through source that calculates CRC32 and size
        !             3:   Copyright (C) 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 <stdlib.h>
        !            37: #include <string.h>
        !            38: 
        !            39: #include "zipint.h"
        !            40: 
        !            41: struct crc {
        !            42:     int eof;
        !            43:     int validate;
        !            44:     int e[2];
        !            45:     zip_uint64_t size;
        !            46:     zip_uint32_t crc;
        !            47: };
        !            48: 
        !            49: static zip_int64_t crc_read(struct zip_source *, void *, void *
        !            50:                            , zip_uint64_t, enum zip_source_cmd);
        !            51: 
        !            52: 
        !            53: 
        !            54: ZIP_EXTERN(struct zip_source *)
        !            55: zip_source_crc(struct zip *za, struct zip_source *src, int validate)
        !            56: {
        !            57:     struct crc *ctx;
        !            58: 
        !            59:     if (src == NULL) {
        !            60:        _zip_error_set(&za->error, ZIP_ER_INVAL, 0);
        !            61:        return NULL;
        !            62:     }
        !            63: 
        !            64:     if ((ctx=(struct crc *)malloc(sizeof(*ctx))) == NULL) {
        !            65:        _zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
        !            66:        return NULL;
        !            67:     }
        !            68: 
        !            69:     ctx->validate = validate;
        !            70: 
        !            71:     return zip_source_layered(za, src, crc_read, ctx);
        !            72: }
        !            73: 
        !            74: 
        !            75: 
        !            76: static zip_int64_t
        !            77: crc_read(struct zip_source *src, void *_ctx, void *data,
        !            78:         zip_uint64_t len, enum zip_source_cmd cmd)
        !            79: {
        !            80:     struct crc *ctx;
        !            81:     zip_int64_t n;
        !            82: 
        !            83:     ctx = (struct crc *)_ctx;
        !            84: 
        !            85:     switch (cmd) {
        !            86:     case ZIP_SOURCE_OPEN:
        !            87:        ctx->eof = 0;
        !            88:        ctx->crc = crc32(0, NULL, 0);
        !            89:        ctx->size = 0;
        !            90: 
        !            91:        return 0;
        !            92: 
        !            93:     case ZIP_SOURCE_READ:
        !            94:        if (ctx->eof || len == 0)
        !            95:            return 0;
        !            96: 
        !            97:        if ((n=zip_source_read(src, data, len)) < 0)
        !            98:            return ZIP_SOURCE_ERR_LOWER;
        !            99: 
        !           100:        if (n == 0) {
        !           101:            ctx->eof = 1;
        !           102:            if (ctx->validate) {
        !           103:                struct zip_stat st;
        !           104: 
        !           105:                if (zip_source_stat(src, &st) < 0)
        !           106:                    return ZIP_SOURCE_ERR_LOWER;
        !           107: 
        !           108:                if ((st.valid & ZIP_STAT_CRC) && st.crc != ctx->crc) {
        !           109:                    ctx->e[0] = ZIP_ER_CRC;
        !           110:                    ctx->e[1] = 0;
        !           111:                    
        !           112:                    return -1;
        !           113:                }
        !           114:                if ((st.valid & ZIP_STAT_SIZE) && st.size != ctx->size) {
        !           115:                    ctx->e[0] = ZIP_ER_INCONS;
        !           116:                    ctx->e[1] = 0;
        !           117:                    
        !           118:                    return -1;
        !           119:                }
        !           120:            }
        !           121:        }
        !           122:        else {
        !           123:            ctx->size += n;
        !           124:            ctx->crc = crc32(ctx->crc, data, n);
        !           125:        }
        !           126:        return n;
        !           127: 
        !           128:     case ZIP_SOURCE_CLOSE:
        !           129:        return 0;
        !           130: 
        !           131:     case ZIP_SOURCE_STAT:
        !           132:        {
        !           133:            struct zip_stat *st;
        !           134: 
        !           135:            st = (struct zip_stat *)data;
        !           136: 
        !           137:            if (ctx->eof) {
        !           138:                /* XXX: Set comp_size, comp_method, encryption_method?
        !           139:                        After all, this only works for uncompressed data. */
        !           140:                st->size = ctx->size;
        !           141:                st->crc = ctx->crc;
        !           142:                st->valid |= ZIP_STAT_SIZE|ZIP_STAT_CRC;
        !           143:            }
        !           144:        }
        !           145:        return 0;
        !           146:        
        !           147:     case ZIP_SOURCE_ERROR:
        !           148:        memcpy(data, ctx->e, sizeof(ctx->e));
        !           149:        return 0;
        !           150: 
        !           151:     case ZIP_SOURCE_FREE:
        !           152:        free(ctx);
        !           153:        return 0;
        !           154: 
        !           155:     default:
        !           156:        return -1;
        !           157:     }
        !           158:     
        !           159: }