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1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 1998 - 2016, 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 #if (CURL_SIZEOF_CURL_OFF_T > 4)
66 /*
67  * Curl_read64_le()
68  *
69  * This function converts a 64-bit integer from the little endian format, as
70  * used in the incoming package to whatever endian format we're using
71  * natively.
72  *
73  * Parameters:
74  *
75  * buf      [in]     - A pointer to a 8 byte buffer.
76  *
77  * Returns the integer.
78  */
79 #if defined(HAVE_LONGLONG)
Curl_read64_le(const unsigned char * buf)80 unsigned long long Curl_read64_le(const unsigned char *buf)
81 {
82   return ((unsigned long long)buf[0]) |
83          ((unsigned long long)buf[1] << 8) |
84          ((unsigned long long)buf[2] << 16) |
85          ((unsigned long long)buf[3] << 24) |
86          ((unsigned long long)buf[4] << 32) |
87          ((unsigned long long)buf[5] << 40) |
88          ((unsigned long long)buf[6] << 48) |
89          ((unsigned long long)buf[7] << 56);
90 }
91 #else
Curl_read64_le(const unsigned char * buf)92 unsigned __int64 Curl_read64_le(const unsigned char *buf)
93 {
94   return ((unsigned __int64)buf[0]) | ((unsigned __int64)buf[1] << 8) |
95          ((unsigned __int64)buf[2] << 16) | ((unsigned __int64)buf[3] << 24) |
96          ((unsigned __int64)buf[4] << 32) | ((unsigned __int64)buf[5] << 40) |
97          ((unsigned __int64)buf[6] << 48) | ((unsigned __int64)buf[7] << 56);
98 }
99 #endif
100 
101 #endif /* CURL_SIZEOF_CURL_OFF_T > 4 */
102 
103 /*
104  * Curl_read16_be()
105  *
106  * This function converts a 16-bit integer from the big endian format, as
107  * used in the incoming package to whatever endian format we're using
108  * natively.
109  *
110  * Parameters:
111  *
112  * buf      [in]     - A pointer to a 2 byte buffer.
113  *
114  * Returns the integer.
115  */
Curl_read16_be(const unsigned char * buf)116 unsigned short Curl_read16_be(const unsigned char *buf)
117 {
118   return (unsigned short)(((unsigned short)buf[0] << 8) |
119                           ((unsigned short)buf[1]));
120 }
121 
122 /*
123  * Curl_read32_be()
124  *
125  * This function converts a 32-bit integer from the big endian format, as
126  * used in the incoming package to whatever endian format we're using
127  * natively.
128  *
129  * Parameters:
130  *
131  * buf      [in]     - A pointer to a 4 byte buffer.
132  *
133  * Returns the integer.
134  */
Curl_read32_be(const unsigned char * buf)135 unsigned int Curl_read32_be(const unsigned char *buf)
136 {
137   return ((unsigned int)buf[0] << 24) | ((unsigned int)buf[1] << 16) |
138          ((unsigned int)buf[2] << 8) | ((unsigned int)buf[3]);
139 }
140 
141 #if (CURL_SIZEOF_CURL_OFF_T > 4)
142 /*
143  * Curl_read64_be()
144  *
145  * This function converts a 64-bit integer from the big endian format, as
146  * used in the incoming package to whatever endian format we're using
147  * natively.
148  *
149  * Parameters:
150  *
151  * buf      [in]     - A pointer to a 8 byte buffer.
152  *
153  * Returns the integer.
154  */
155 #if defined(HAVE_LONGLONG)
Curl_read64_be(const unsigned char * buf)156 unsigned long long Curl_read64_be(const unsigned char *buf)
157 {
158   return ((unsigned long long)buf[0] << 56) |
159          ((unsigned long long)buf[1] << 48) |
160          ((unsigned long long)buf[2] << 40) |
161          ((unsigned long long)buf[3] << 32) |
162          ((unsigned long long)buf[4] << 24) |
163          ((unsigned long long)buf[5] << 16) |
164          ((unsigned long long)buf[6] << 8) |
165          ((unsigned long long)buf[7]);
166 }
167 #else
Curl_read64_be(const unsigned char * buf)168 unsigned __int64 Curl_read64_be(const unsigned char *buf)
169 {
170   return ((unsigned __int64)buf[0] << 56) | ((unsigned __int64)buf[1] << 48) |
171          ((unsigned __int64)buf[2] << 40) | ((unsigned __int64)buf[3] << 32) |
172          ((unsigned __int64)buf[4] << 24) | ((unsigned __int64)buf[5] << 16) |
173          ((unsigned __int64)buf[6] << 8) | ((unsigned __int64)buf[7]);
174 }
175 #endif
176 
177 #endif /* CURL_SIZEOF_CURL_OFF_T > 4 */
178 
179 /*
180  * Curl_write16_le()
181  *
182  * This function converts a 16-bit integer from the native endian format,
183  * to little endian format ready for sending down the wire.
184  *
185  * Parameters:
186  *
187  * value    [in]     - The 16-bit integer value.
188  * buffer   [in]     - A pointer to the output buffer.
189  */
Curl_write16_le(const short value,unsigned char * buffer)190 void Curl_write16_le(const short value, unsigned char *buffer)
191 {
192   buffer[0] = (char)(value & 0x00FF);
193   buffer[1] = (char)((value & 0xFF00) >> 8);
194 }
195 
196 /*
197  * Curl_write32_le()
198  *
199  * This function converts a 32-bit integer from the native endian format,
200  * to little endian format ready for sending down the wire.
201  *
202  * Parameters:
203  *
204  * value    [in]     - The 32-bit integer value.
205  * buffer   [in]     - A pointer to the output buffer.
206  */
Curl_write32_le(const int value,unsigned char * buffer)207 void Curl_write32_le(const int value, unsigned char *buffer)
208 {
209   buffer[0] = (char)(value & 0x000000FF);
210   buffer[1] = (char)((value & 0x0000FF00) >> 8);
211   buffer[2] = (char)((value & 0x00FF0000) >> 16);
212   buffer[3] = (char)((value & 0xFF000000) >> 24);
213 }
214 
215 #if (CURL_SIZEOF_CURL_OFF_T > 4)
216 /*
217  * Curl_write64_le()
218  *
219  * This function converts a 64-bit integer from the native endian format,
220  * to little endian format ready for sending down the wire.
221  *
222  * Parameters:
223  *
224  * value    [in]     - The 64-bit integer value.
225  * buffer   [in]     - A pointer to the output buffer.
226  */
227 #if defined(HAVE_LONGLONG)
Curl_write64_le(const long long value,unsigned char * buffer)228 void Curl_write64_le(const long long value, unsigned char *buffer)
229 #else
230 void Curl_write64_le(const __int64 value, unsigned char *buffer)
231 #endif
232 {
233   Curl_write32_le((int)value, buffer);
234   Curl_write32_le((int)(value >> 32), buffer + 4);
235 }
236 #endif /* CURL_SIZEOF_CURL_OFF_T > 4 */
237