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Annotation of embedaddon/curl/lib/curl_endian.c, revision 1.1

1.1     ! misho       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 */