root/ext/zip/lib/zip_source_buffer.c

DEFINITIONS

1. zip_source_buffer
2. read_data

   1 /*
   2   zip_source_buffer.c -- create zip data source from buffer
   3   Copyright (C) 1999-2009 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 read_data {
  42     const char *buf, *data, *end;
  43     time_t mtime;
  44     int freep;
  45 };
  46 
  47 static zip_int64_t read_data(void *, void *, zip_uint64_t, enum zip_source_cmd);
  48 
  49 
  50 
  51 ZIP_EXTERN struct zip_source *
  52 zip_source_buffer(struct zip *za, const void *data, zip_uint64_t len, int freep)
  53 {
  54     struct read_data *f;
  55     struct zip_source *zs;
  56 
  57     if (za == NULL)
  58         return NULL;
  59 
  60     if (data == NULL && len > 0) {
  61         _zip_error_set(&za->error, ZIP_ER_INVAL, 0);
  62         return NULL;
  63     }
  64 
  65     if ((f=(struct read_data *)malloc(sizeof(*f))) == NULL) {
  66         _zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
  67         return NULL;
  68     }
  69 
  70     f->data = (const char *)data;
  71     f->end = ((const char *)data)+len;
  72     f->freep = freep;
  73     f->mtime = time(NULL);
  74     
  75     if ((zs=zip_source_function(za, read_data, f)) == NULL) {
  76         free(f);
  77         return NULL;
  78     }
  79 
  80     return zs;
  81 }
  82 
  83 
  84 
  85 static zip_int64_t
  86 read_data(void *state, void *data, zip_uint64_t len, enum zip_source_cmd cmd)
  87 {
  88     struct read_data *z;
  89     char *buf;
  90     zip_uint64_t n;
  91 
  92     z = (struct read_data *)state;
  93     buf = (char *)data;
  94 
  95     switch (cmd) {
  96     case ZIP_SOURCE_OPEN:
  97         z->buf = z->data;
  98         return 0;
  99         
 100     case ZIP_SOURCE_READ:
 101         n = (zip_uint64_t)(z->end - z->buf);
 102         if (n > len)
 103             n = len;
 104 
 105         if (n) {
 106             memcpy(buf, z->buf, n);
 107             z->buf += n;
 108         }
 109 
 110         return (zip_int64_t)n;
 111         
 112     case ZIP_SOURCE_CLOSE:
 113         return 0;
 114 
 115     case ZIP_SOURCE_STAT:
 116         {
 117             struct zip_stat *st;
 118             
 119             if (len < sizeof(*st))
 120                 return -1;
 121 
 122             st = (struct zip_stat *)data;
 123 
 124             zip_stat_init(st);
 125             st->mtime = z->mtime;
 126             st->size = (zip_uint64_t)(z->end - z->data);
 127             st->comp_size = st->size;
 128             st->comp_method = ZIP_CM_STORE;
 129             st->encryption_method = ZIP_EM_NONE;
 130             st->valid = ZIP_STAT_MTIME|ZIP_STAT_SIZE|ZIP_STAT_COMP_SIZE
 131                 |ZIP_STAT_COMP_METHOD|ZIP_STAT_ENCRYPTION_METHOD;
 132             
 133             return sizeof(*st);
 134         }
 135 
 136     case ZIP_SOURCE_ERROR:
 137         {
 138             int *e;
 139 
 140             if (len < sizeof(int)*2)
 141                 return -1;
 142 
 143             e = (int *)data;
 144             e[0] = e[1] = 0;
 145         }
 146         return sizeof(int)*2;
 147 
 148     case ZIP_SOURCE_FREE:
 149         if (z->freep) {
 150             free((void *)z->data);
 151             z->data = NULL;
 152         }
 153         free(z);
 154         return 0;
 155 
 156     default:
 157         ;
 158     }
 159 
 160     return -1;
 161 }