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    1: /***************************************************************************
    2:  *                                  _   _ ____  _
    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
    9:  *
   10:  * This software is licensed as described in the file COPYING, which
   11:  * you should have received as part of this distribution. The terms
   12:  * are also available at https://curl.haxx.se/docs/copyright.html.
   13:  *
   14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   15:  * copies of the Software, and permit persons to whom the Software is
   16:  * furnished to do so, under the terms of the COPYING file.
   17:  *
   18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   19:  * KIND, either express or implied.
   20:  *
   21:  ***************************************************************************/
   22: 
   23: #include "curl_setup.h"
   24: 
   25: #include "curl_endian.h"
   26: 
   27: /*
   28:  * Curl_read16_le()
   29:  *
   30:  * This function converts a 16-bit integer from the little endian format, as
   31:  * used in the incoming package to whatever endian format we're using
   32:  * natively.
   33:  *
   34:  * Parameters:
   35:  *
   36:  * buf      [in]     - A pointer to a 2 byte buffer.
   37:  *
   38:  * Returns the integer.
   39:  */
   40: unsigned short Curl_read16_le(const unsigned char *buf)
   41: {
   42:   return (unsigned short)(((unsigned short)buf[0]) |
   43:                           ((unsigned short)buf[1] << 8));
   44: }
   45: 
   46: /*
   47:  * Curl_read32_le()
   48:  *
   49:  * This function converts a 32-bit integer from the little endian format, as
   50:  * used in the incoming package to whatever endian format we're using
   51:  * natively.
   52:  *
   53:  * Parameters:
   54:  *
   55:  * buf      [in]     - A pointer to a 4 byte buffer.
   56:  *
   57:  * Returns the integer.
   58:  */
   59: unsigned int Curl_read32_le(const unsigned char *buf)
   60: {
   61:   return ((unsigned int)buf[0]) | ((unsigned int)buf[1] << 8) |
   62:          ((unsigned int)buf[2] << 16) | ((unsigned int)buf[3] << 24);
   63: }
   64: 
   65: /*
   66:  * Curl_read16_be()
   67:  *
   68:  * This function converts a 16-bit integer from the big endian format, as
   69:  * used in the incoming package to whatever endian format we're using
   70:  * natively.
   71:  *
   72:  * Parameters:
   73:  *
   74:  * buf      [in]     - A pointer to a 2 byte buffer.
   75:  *
   76:  * Returns the integer.
   77:  */
   78: unsigned short Curl_read16_be(const unsigned char *buf)
   79: {
   80:   return (unsigned short)(((unsigned short)buf[0] << 8) |
   81:                           ((unsigned short)buf[1]));
   82: }
   83: 
   84: #if (CURL_SIZEOF_CURL_OFF_T > 4)
   85: /*
   86:  * write32_le()
   87:  *
   88:  * This function converts a 32-bit integer from the native endian format,
   89:  * to little endian format ready for sending down the wire.
   90:  *
   91:  * Parameters:
   92:  *
   93:  * value    [in]     - The 32-bit integer value.
   94:  * buffer   [in]     - A pointer to the output buffer.
   95:  */
   96: static void write32_le(const int value, unsigned char *buffer)
   97: {
   98:   buffer[0] = (char)(value & 0x000000FF);
   99:   buffer[1] = (char)((value & 0x0000FF00) >> 8);
  100:   buffer[2] = (char)((value & 0x00FF0000) >> 16);
  101:   buffer[3] = (char)((value & 0xFF000000) >> 24);
  102: }
  103: 
  104: /*
  105:  * Curl_write64_le()
  106:  *
  107:  * This function converts a 64-bit integer from the native endian format,
  108:  * to little endian format ready for sending down the wire.
  109:  *
  110:  * Parameters:
  111:  *
  112:  * value    [in]     - The 64-bit integer value.
  113:  * buffer   [in]     - A pointer to the output buffer.
  114:  */
  115: #if defined(HAVE_LONGLONG)
  116: void Curl_write64_le(const long long value, unsigned char *buffer)
  117: #else
  118: void Curl_write64_le(const __int64 value, unsigned char *buffer)
  119: #endif
  120: {
  121:   write32_le((int)value, buffer);
  122:   write32_le((int)(value >> 32), buffer + 4);
  123: }
  124: #endif /* CURL_SIZEOF_CURL_OFF_T > 4 */