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

1.1     ! misho       1: /*
        !             2:   zip_source_buffer.c -- create zip data source from buffer
        !             3:   Copyright (C) 1999-2007 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 read_data {
        !            42:     const char *buf, *data, *end;
        !            43:     time_t mtime;
        !            44:     int freep;
        !            45: };
        !            46: 
        !            47: static ssize_t read_data(void *state, void *data, size_t len,
        !            48:                         enum zip_source_cmd cmd);
        !            49: 
        !            50: 
        !            51: 
        !            52: ZIP_EXTERN(struct zip_source *)
        !            53: zip_source_buffer(struct zip *za, const void *data, off_t len, int freep)
        !            54: {
        !            55:     struct read_data *f;
        !            56:     struct zip_source *zs;
        !            57: 
        !            58:     if (za == NULL)
        !            59:        return NULL;
        !            60: 
        !            61:     if (len < 0 || (data == NULL && len > 0)) {
        !            62:        _zip_error_set(&za->error, ZIP_ER_INVAL, 0);
        !            63:        return NULL;
        !            64:     }
        !            65: 
        !            66:     if ((f=(struct read_data *)malloc(sizeof(*f))) == NULL) {
        !            67:        _zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
        !            68:        return NULL;
        !            69:     }
        !            70: 
        !            71:     f->data = (const char *)data;
        !            72:     f->end = ((const char *)data)+len;
        !            73:     f->freep = freep;
        !            74:     f->mtime = time(NULL);
        !            75:     
        !            76:     if ((zs=zip_source_function(za, read_data, f)) == NULL) {
        !            77:        free(f);
        !            78:        return NULL;
        !            79:     }
        !            80: 
        !            81:     return zs;
        !            82: }
        !            83: 
        !            84: 
        !            85: 
        !            86: static ssize_t
        !            87: read_data(void *state, void *data, size_t len, enum zip_source_cmd cmd)
        !            88: {
        !            89:     struct read_data *z;
        !            90:     char *buf;
        !            91:     size_t n;
        !            92: 
        !            93:     z = (struct read_data *)state;
        !            94:     buf = (char *)data;
        !            95: 
        !            96:     switch (cmd) {
        !            97:     case ZIP_SOURCE_OPEN:
        !            98:        z->buf = z->data;
        !            99:        return 0;
        !           100:        
        !           101:     case ZIP_SOURCE_READ:
        !           102:        n = z->end - z->buf;
        !           103:        if (n > len)
        !           104:            n = len;
        !           105: 
        !           106:        if (n) {
        !           107:            memcpy(buf, z->buf, n);
        !           108:            z->buf += n;
        !           109:        }
        !           110: 
        !           111:        return n;
        !           112:        
        !           113:     case ZIP_SOURCE_CLOSE:
        !           114:        return 0;
        !           115: 
        !           116:     case ZIP_SOURCE_STAT:
        !           117:         {
        !           118:            struct zip_stat *st;
        !           119:            
        !           120:            if (len < sizeof(*st))
        !           121:                return -1;
        !           122: 
        !           123:            st = (struct zip_stat *)data;
        !           124: 
        !           125:            zip_stat_init(st);
        !           126:            st->mtime = z->mtime;
        !           127:            st->size = z->end - z->data;
        !           128:            
        !           129:            return sizeof(*st);
        !           130:        }
        !           131: 
        !           132:     case ZIP_SOURCE_ERROR:
        !           133:        {
        !           134:            int *e;
        !           135: 
        !           136:            if (len < sizeof(int)*2)
        !           137:                return -1;
        !           138: 
        !           139:            e = (int *)data;
        !           140:            e[0] = e[1] = 0;
        !           141:        }
        !           142:        return sizeof(int)*2;
        !           143: 
        !           144:     case ZIP_SOURCE_FREE:
        !           145:        if (z->freep) {
        !           146:            free((void *)z->data);
        !           147:            z->data = NULL;
        !           148:        }
        !           149:        free(z);
        !           150:        return 0;
        !           151: 
        !           152:     default:
        !           153:        ;
        !           154:     }
        !           155: 
        !           156:     return -1;
        !           157: }