root/ext/zip/lib/zip_io_util.c

DEFINITIONS

1. _zip_read
2. _zip_read_data
3. _zip_read_string
4. _zip_write

   1 /*
   2  zip_io_util.c -- I/O helper functions
   3  Copyright (C) 1999-2015 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 #include <stdlib.h>
  35 #include <string.h>
  36 
  37 #include "zipint.h"
  38 
  39 int
  40 _zip_read(zip_source_t *src, zip_uint8_t *b, zip_uint64_t length, zip_error_t *error)
  41 {
  42     zip_int64_t n;
  43 
  44     if (length > ZIP_INT64_MAX) {
  45         zip_error_set(error, ZIP_ER_INTERNAL, 0);
  46         return -1;
  47     }
  48 
  49     if ((n = zip_source_read(src, b, length)) < 0) {
  50         _zip_error_set_from_source(error, src);
  51         return -1;
  52     }
  53 
  54     if (n < (zip_int64_t)length) {
  55         zip_error_set(error, ZIP_ER_EOF, 0);
  56         return -1;
  57     }
  58 
  59     return 0;
  60 }
  61 
  62 
  63 zip_uint8_t *
  64 _zip_read_data(zip_buffer_t *buffer, zip_source_t *src, size_t length, bool nulp, zip_error_t *error)
  65 {
  66     zip_uint8_t *r;
  67     
  68     if (length == 0 && !nulp) {
  69         return NULL;
  70     }
  71 
  72     r = (zip_uint8_t *)malloc(length + (nulp ? 1 : 0));
  73     if (!r) {
  74         zip_error_set(error, ZIP_ER_MEMORY, 0);
  75         return NULL;
  76     }
  77 
  78     if (buffer) {
  79         zip_uint8_t *data = _zip_buffer_get(buffer, length);
  80         
  81         if (data == NULL) {
  82             zip_error_set(error, ZIP_ER_MEMORY, 0);
  83             free(r);
  84             return NULL;
  85         }
  86         memcpy(r, data, length);
  87     }
  88     else {
  89         if (_zip_read(src, r, length, error) < 0) {
  90             free(r);
  91             return NULL;
  92         }
  93     }
  94 
  95     if (nulp) {
  96         zip_uint8_t *o;
  97         /* replace any in-string NUL characters with spaces */
  98         r[length] = 0;
  99         for (o=r; o<r+length; o++)
 100             if (*o == '\0')
 101                 *o = ' ';
 102     }
 103 
 104     return r;
 105 }
 106 
 107 
 108 zip_string_t *
 109 _zip_read_string(zip_buffer_t *buffer, zip_source_t *src, zip_uint16_t len, bool nulp, zip_error_t *error)
 110 {
 111     zip_uint8_t *raw;
 112     zip_string_t *s;
 113 
 114     if ((raw=_zip_read_data(buffer, src, len, nulp, error)) == NULL)
 115         return NULL;
 116 
 117     s = _zip_string_new(raw, len, ZIP_FL_ENC_GUESS, error);
 118     free(raw);
 119     return s;
 120 }
 121 
 122 
 123 int
 124 _zip_write(zip_t *za, const void *data, zip_uint64_t length)
 125 {
 126     zip_int64_t n;
 127     
 128     if ((n = zip_source_write(za->src, data, length)) < 0) {
 129         _zip_error_set_from_source(&za->error, za->src);
 130         return -1;
 131     }
 132     if ((zip_uint64_t)n != length) {
 133         zip_error_set(&za->error, ZIP_ER_WRITE, EINTR);
 134         return -1;
 135     }
 136     
 137     return 0;
 138 }