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 | /* |
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 | */ |
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) |
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 | |