1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel (at) 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 #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) 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 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 */ 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 */ 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) 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 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 */ 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 */ 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) 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
