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 */
Curl_read16_le(const unsigned char * buf)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 */
Curl_read32_le(const unsigned char * buf)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 */
Curl_read16_be(const unsigned char * buf)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 /*
85 * write32_le()
86 *
87 * This function converts a 32-bit integer from the native endian format,
88 * to little endian format ready for sending down the wire.
89 *
90 * Parameters:
91 *
92 * value [in] - The 32-bit integer value.
93 * buffer [in] - A pointer to the output buffer.
94 */
write32_le(const int value,unsigned char * buffer)95 static void write32_le(const int value, unsigned char *buffer)
96 {
97 buffer[0] = (char)(value & 0x000000FF);
98 buffer[1] = (char)((value & 0x0000FF00) >> 8);
99 buffer[2] = (char)((value & 0x00FF0000) >> 16);
100 buffer[3] = (char)((value & 0xFF000000) >> 24);
101 }
102
103 #if (CURL_SIZEOF_CURL_OFF_T > 4)
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)
Curl_write64_le(const long long value,unsigned char * buffer)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 */
125