root/ext/zip/lib/zip_buffer.c

DEFINITIONS

1. _zip_buffer_data
2. _zip_buffer_free
3. _zip_buffer_eof
4. _zip_buffer_get
5. _zip_buffer_get_16
6. _zip_buffer_get_32
7. _zip_buffer_get_64
8. _zip_buffer_get_8
9. _zip_buffer_left
10. _zip_buffer_new
11. _zip_buffer_new_from_source
12. _zip_buffer_offset
13. _zip_buffer_ok
14. _zip_buffer_put
15. _zip_buffer_put_16
16. _zip_buffer_put_32
17. _zip_buffer_put_64
18. _zip_buffer_put_8
19. _zip_buffer_set_offset
20. _zip_buffer_skip
21. _zip_buffer_size

   1 /*
   2  zip_buffer.c -- bounds checked access to memory buffer
   3  Copyright (C) 2014 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 zip_uint8_t *
  40 _zip_buffer_data(zip_buffer_t *buffer)
  41 {
  42     return buffer->data;
  43 }
  44 
  45 
  46 void
  47 _zip_buffer_free(zip_buffer_t *buffer)
  48 {
  49     if (buffer == NULL) {
  50         return;
  51     }
  52     
  53     if (buffer->free_data) {
  54         free(buffer->data);
  55     }
  56     
  57     free(buffer);
  58 }
  59 
  60 
  61 bool
  62 _zip_buffer_eof(zip_buffer_t *buffer)
  63 {
  64     return buffer->ok && buffer->offset == buffer->size;
  65 }
  66 
  67 
  68 zip_uint8_t *
  69 _zip_buffer_get(zip_buffer_t *buffer, zip_uint64_t length)
  70 {
  71     zip_uint8_t *data;
  72     
  73     if (!buffer->ok || buffer->offset + length < length || buffer->offset + length > buffer->size) {
  74         buffer->ok = false;
  75         return NULL;
  76     }
  77     
  78     data = buffer->data + buffer->offset;
  79     buffer->offset += length;
  80     return data;
  81 }
  82 
  83 
  84 zip_uint16_t
  85 _zip_buffer_get_16(zip_buffer_t *buffer)
  86 {
  87     zip_uint8_t *data = _zip_buffer_get(buffer, 2);
  88     
  89     if (data == NULL) {
  90         return 0;
  91     }
  92     
  93     return (zip_uint16_t)(data[0] + (data[1] << 8));
  94 }
  95 
  96 
  97 zip_uint32_t
  98 _zip_buffer_get_32(zip_buffer_t *buffer)
  99 {
 100     zip_uint8_t *data = _zip_buffer_get(buffer, 4);
 101     
 102     if (data == NULL) {
 103         return 0;
 104     }
 105     
 106     return ((((((zip_uint32_t)data[3] << 8) + data[2]) << 8) + data[1]) << 8) + data[0];
 107 }
 108 
 109 
 110 zip_uint64_t
 111 _zip_buffer_get_64(zip_buffer_t *buffer)
 112 {
 113     zip_uint8_t *data = _zip_buffer_get(buffer, 8);
 114     
 115     if (data == NULL) {
 116         return 0;
 117     }
 118 
 119     return ((zip_uint64_t)data[7] << 56) + ((zip_uint64_t)data[6] << 48) + ((zip_uint64_t)data[5] << 40) + ((zip_uint64_t)data[4] << 32) + ((zip_uint64_t)data[3] << 24) + ((zip_uint64_t)data[2] << 16) + ((zip_uint64_t)data[1] << 8) + (zip_uint64_t)data[0];
 120 }
 121 
 122 
 123 
 124 zip_uint8_t
 125 _zip_buffer_get_8(zip_buffer_t *buffer)
 126 {
 127     zip_uint8_t *data = _zip_buffer_get(buffer, 1);
 128     
 129     if (data == NULL) {
 130         return 0;
 131     }
 132     
 133     return data[0];
 134 }
 135 
 136 
 137 zip_uint64_t
 138 _zip_buffer_left(zip_buffer_t *buffer)
 139 {
 140     return buffer->ok ? buffer->size - buffer->offset : 0;
 141 }
 142 
 143 
 144 zip_buffer_t *
 145 _zip_buffer_new(zip_uint8_t *data, zip_uint64_t size)
 146 {
 147     bool free_data = (data == NULL);
 148     zip_buffer_t *buffer;
 149     
 150     if (data == NULL) {
 151         if ((data = (zip_uint8_t *)malloc(size)) == NULL) {
 152             return NULL;
 153         }
 154     }
 155 
 156     if ((buffer = (zip_buffer_t *)malloc(sizeof(*buffer))) == NULL) {
 157         if (free_data) {
 158             free(data);
 159         }
 160         return NULL;
 161     }
 162     
 163     buffer->ok = true;
 164     buffer->data = data;
 165     buffer->size = size;
 166     buffer->offset = 0;
 167     buffer->free_data = free_data;
 168     
 169     return buffer;
 170 }
 171 
 172 
 173 zip_buffer_t *
 174 _zip_buffer_new_from_source(zip_source_t *src, zip_uint64_t size, zip_uint8_t *buf, zip_error_t *error)
 175 {
 176     zip_buffer_t *buffer;
 177     
 178     if ((buffer = _zip_buffer_new(buf, size)) == NULL) {
 179         zip_error_set(error, ZIP_ER_MEMORY, 0);
 180         return NULL;
 181     }
 182     
 183     if (_zip_read(src, buffer->data, size, error) < 0) {
 184         _zip_buffer_free(buffer);
 185         return NULL;
 186     }
 187     
 188     return buffer;
 189 }
 190 
 191 
 192 zip_uint64_t
 193 _zip_buffer_offset(zip_buffer_t *buffer)
 194 {
 195     return buffer->ok ? buffer->offset : 0;
 196 }
 197 
 198 
 199 bool
 200 _zip_buffer_ok(zip_buffer_t *buffer)
 201 {
 202     return buffer->ok;
 203 }
 204 
 205 
 206 int
 207 _zip_buffer_put(zip_buffer_t *buffer, const void *src, size_t length)
 208 {
 209     zip_uint8_t *dst = _zip_buffer_get(buffer, length);
 210     
 211     if (dst == NULL) {
 212         return -1;
 213     }
 214     
 215     memcpy(dst, src, length);
 216     return 0;
 217 }
 218 
 219 
 220 int
 221 _zip_buffer_put_16(zip_buffer_t *buffer, zip_uint16_t i)
 222 {
 223     zip_uint8_t *data = _zip_buffer_get(buffer, 2);
 224     
 225     if (data == NULL) {
 226         return -1;
 227     }
 228 
 229     data[0] = (zip_uint8_t)(i & 0xff);
 230     data[1] = (zip_uint8_t)((i >> 8) & 0xff);
 231     
 232     return 0;
 233 }
 234 
 235 
 236 int
 237 _zip_buffer_put_32(zip_buffer_t *buffer, zip_uint32_t i)
 238 {
 239     zip_uint8_t *data = _zip_buffer_get(buffer, 4);
 240     
 241     if (data == NULL) {
 242         return -1;
 243     }
 244     
 245     data[0] = (zip_uint8_t)(i & 0xff);
 246     data[1] = (zip_uint8_t)((i >> 8) & 0xff);
 247     data[2] = (zip_uint8_t)((i >> 16) & 0xff);
 248     data[3] = (zip_uint8_t)((i >> 24) & 0xff);
 249     
 250     return 0;
 251 }
 252 
 253 
 254 int
 255 _zip_buffer_put_64(zip_buffer_t *buffer, zip_uint64_t i)
 256 {
 257     zip_uint8_t *data = _zip_buffer_get(buffer, 8);
 258     
 259     if (data == NULL) {
 260         return -1;
 261     }
 262     
 263     data[0] = (zip_uint8_t)(i & 0xff);
 264     data[1] = (zip_uint8_t)((i >> 8) & 0xff);
 265     data[2] = (zip_uint8_t)((i >> 16) & 0xff);
 266     data[3] = (zip_uint8_t)((i >> 24) & 0xff);
 267     data[4] = (zip_uint8_t)((i >> 32) & 0xff);
 268     data[5] = (zip_uint8_t)((i >> 40) & 0xff);
 269     data[6] = (zip_uint8_t)((i >> 48) & 0xff);
 270     data[7] = (zip_uint8_t)((i >> 56) & 0xff);
 271     
 272     return 0;
 273 }
 274 
 275 
 276 int
 277 _zip_buffer_put_8(zip_buffer_t *buffer, zip_uint8_t i)
 278 {
 279     zip_uint8_t *data = _zip_buffer_get(buffer, 1);
 280     
 281     if (data == NULL) {
 282         return -1;
 283     }
 284     
 285     data[0] = i;
 286     
 287     return 0;
 288 }
 289 
 290 
 291 int
 292 _zip_buffer_set_offset(zip_buffer_t *buffer, zip_uint64_t offset)
 293 {
 294     if (offset > buffer->size) {
 295         buffer->ok = false;
 296         return -1;
 297     }
 298     
 299     buffer->ok = true;
 300     buffer->offset = offset;
 301     
 302     return 0;
 303 }
 304 
 305 
 306 int
 307 _zip_buffer_skip(zip_buffer_t *buffer, zip_uint64_t length) {
 308     zip_uint64_t offset = buffer->offset + length;
 309     
 310     if (offset < buffer->offset) {
 311         buffer->ok = false;
 312         return -1;
 313     }
 314     return _zip_buffer_set_offset(buffer, offset);
 315 }
 316 
 317 zip_uint64_t
 318 _zip_buffer_size(zip_buffer_t *buffer)
 319 {
 320     return buffer->size;
 321 }