1 | /***************************************************************************
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2 | * _ _ ____ _
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3 | * Project ___| | | | _ \| |
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4 | * / __| | | | |_) | |
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5 | * | (__| |_| | _ <| |___
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6 | * \___|\___/|_| \_\_____|
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7 | *
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8 | * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 | *
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10 | * This software is licensed as described in the file COPYING, which
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11 | * you should have received as part of this distribution. The terms
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12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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13 | *
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14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 | * copies of the Software, and permit persons to whom the Software is
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16 | * furnished to do so, under the terms of the COPYING file.
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17 | *
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18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 | * KIND, either express or implied.
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20 | *
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21 | ***************************************************************************/
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22 |
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23 | #include "curl_setup.h"
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24 |
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25 | #include "curl_endian.h"
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26 |
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27 | /*
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28 | * Curl_read16_le()
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29 | *
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30 | * This function converts a 16-bit integer from the little endian format, as
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31 | * used in the incoming package to whatever endian format we're using
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32 | * natively.
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33 | *
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34 | * Parameters:
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35 | *
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36 | * buf [in] - A pointer to a 2 byte buffer.
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37 | *
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38 | * Returns the integer.
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39 | */
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40 | unsigned short Curl_read16_le(unsigned char *buf)
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41 | {
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42 | return (unsigned short)(((unsigned short)buf[0]) |
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43 | ((unsigned short)buf[1] << 8));
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44 | }
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45 |
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46 | /*
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47 | * Curl_read32_le()
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48 | *
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49 | * This function converts a 32-bit integer from the little endian format, as
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50 | * used in the incoming package to whatever endian format we're using
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51 | * natively.
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52 | *
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53 | * Parameters:
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54 | *
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55 | * buf [in] - A pointer to a 4 byte buffer.
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56 | *
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57 | * Returns the integer.
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58 | */
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59 | unsigned int Curl_read32_le(unsigned char *buf)
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60 | {
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61 | return ((unsigned int)buf[0]) | ((unsigned int)buf[1] << 8) |
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62 | ((unsigned int)buf[2] << 16) | ((unsigned int)buf[3] << 24);
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63 | }
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64 |
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65 | #if (CURL_SIZEOF_CURL_OFF_T > 4)
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66 | /*
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67 | * Curl_read64_le()
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68 | *
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69 | * This function converts a 64-bit integer from the little endian format, as
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70 | * used in the incoming package to whatever endian format we're using
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71 | * natively.
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72 | *
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73 | * Parameters:
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74 | *
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75 | * buf [in] - A pointer to a 8 byte buffer.
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76 | *
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77 | * Returns the integer.
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78 | */
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79 | #if defined(HAVE_LONGLONG)
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80 | unsigned long long Curl_read64_le(unsigned char *buf)
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81 | {
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82 | return ((unsigned long long)buf[0]) |
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83 | ((unsigned long long)buf[1] << 8) |
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84 | ((unsigned long long)buf[2] << 16) |
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85 | ((unsigned long long)buf[3] << 24) |
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86 | ((unsigned long long)buf[4] << 32) |
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87 | ((unsigned long long)buf[5] << 40) |
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88 | ((unsigned long long)buf[6] << 48) |
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89 | ((unsigned long long)buf[7] << 56);
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90 | }
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91 | #else
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92 | unsigned __int64 Curl_read64_le(unsigned char *buf)
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93 | {
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94 | return ((unsigned __int64)buf[0]) | ((unsigned __int64)buf[1] << 8) |
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95 | ((unsigned __int64)buf[2] << 16) | ((unsigned __int64)buf[3] << 24) |
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96 | ((unsigned __int64)buf[4] << 32) | ((unsigned __int64)buf[5] << 40) |
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97 | ((unsigned __int64)buf[6] << 48) | ((unsigned __int64)buf[7] << 56);
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98 | }
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99 | #endif
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100 |
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101 | #endif /* CURL_SIZEOF_CURL_OFF_T > 4 */
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102 |
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103 | /*
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104 | * Curl_read16_be()
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105 | *
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106 | * This function converts a 16-bit integer from the big endian format, as
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107 | * used in the incoming package to whatever endian format we're using
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108 | * natively.
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109 | *
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110 | * Parameters:
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111 | *
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112 | * buf [in] - A pointer to a 2 byte buffer.
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113 | *
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114 | * Returns the integer.
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115 | */
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116 | unsigned short Curl_read16_be(unsigned char *buf)
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117 | {
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118 | return (unsigned short)(((unsigned short)buf[0] << 8) |
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119 | ((unsigned short)buf[1]));
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120 | }
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121 |
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122 | /*
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123 | * Curl_read32_be()
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124 | *
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125 | * This function converts a 32-bit integer from the big endian format, as
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126 | * used in the incoming package to whatever endian format we're using
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127 | * natively.
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128 | *
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129 | * Parameters:
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130 | *
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131 | * buf [in] - A pointer to a 4 byte buffer.
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132 | *
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133 | * Returns the integer.
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134 | */
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135 | unsigned int Curl_read32_be(unsigned char *buf)
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136 | {
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137 | return ((unsigned int)buf[0] << 24) | ((unsigned int)buf[1] << 16) |
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138 | ((unsigned int)buf[2] << 8) | ((unsigned int)buf[3]);
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139 | }
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140 |
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141 | #if (CURL_SIZEOF_CURL_OFF_T > 4)
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142 | /*
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143 | * Curl_read64_be()
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144 | *
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145 | * This function converts a 64-bit integer from the big endian format, as
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146 | * used in the incoming package to whatever endian format we're using
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147 | * natively.
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148 | *
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149 | * Parameters:
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150 | *
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151 | * buf [in] - A pointer to a 8 byte buffer.
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152 | *
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153 | * Returns the integer.
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154 | */
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155 | #if defined(HAVE_LONGLONG)
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156 | unsigned long long Curl_read64_be(unsigned char *buf)
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157 | {
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158 | return ((unsigned long long)buf[0] << 56) |
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159 | ((unsigned long long)buf[1] << 48) |
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160 | ((unsigned long long)buf[2] << 40) |
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161 | ((unsigned long long)buf[3] << 32) |
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162 | ((unsigned long long)buf[4] << 24) |
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163 | ((unsigned long long)buf[5] << 16) |
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164 | ((unsigned long long)buf[6] << 8) |
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165 | ((unsigned long long)buf[7]);
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166 | }
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167 | #else
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168 | unsigned __int64 Curl_read64_be(unsigned char *buf)
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169 | {
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170 | return ((unsigned __int64)buf[0] << 56) | ((unsigned __int64)buf[1] << 48) |
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171 | ((unsigned __int64)buf[2] << 40) | ((unsigned __int64)buf[3] << 32) |
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172 | ((unsigned __int64)buf[4] << 24) | ((unsigned __int64)buf[5] << 16) |
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173 | ((unsigned __int64)buf[6] << 8) | ((unsigned __int64)buf[7]);
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174 | }
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175 | #endif
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176 |
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177 | #endif /* CURL_SIZEOF_CURL_OFF_T > 4 */
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178 |
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179 | /*
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180 | * Curl_write16_le()
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181 | *
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182 | * This function converts a 16-bit integer from the native endian format,
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183 | * to little endian format ready for sending down the wire.
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184 | *
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185 | * Parameters:
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186 | *
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187 | * value [in] - The 16-bit integer value.
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188 | * buffer [in] - A pointer to the output buffer.
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189 | */
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190 | void Curl_write16_le(const short value, unsigned char *buffer)
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191 | {
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192 | buffer[0] = (char)(value & 0x00FF);
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193 | buffer[1] = (char)((value & 0xFF00) >> 8);
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194 | }
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195 |
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196 | /*
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197 | * Curl_write32_le()
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198 | *
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199 | * This function converts a 32-bit integer from the native endian format,
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200 | * to little endian format ready for sending down the wire.
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201 | *
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202 | * Parameters:
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203 | *
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204 | * value [in] - The 32-bit integer value.
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205 | * buffer [in] - A pointer to the output buffer.
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206 | */
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207 | void Curl_write32_le(const int value, unsigned char *buffer)
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208 | {
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209 | buffer[0] = (char)(value & 0x000000FF);
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210 | buffer[1] = (char)((value & 0x0000FF00) >> 8);
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211 | buffer[2] = (char)((value & 0x00FF0000) >> 16);
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212 | buffer[3] = (char)((value & 0xFF000000) >> 24);
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213 | }
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214 |
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215 | #if (CURL_SIZEOF_CURL_OFF_T > 4)
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216 | /*
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217 | * Curl_write64_le()
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218 | *
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219 | * This function converts a 64-bit integer from the native endian format,
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220 | * to little endian format ready for sending down the wire.
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221 | *
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222 | * Parameters:
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223 | *
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224 | * value [in] - The 64-bit integer value.
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225 | * buffer [in] - A pointer to the output buffer.
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226 | */
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227 | #if defined(HAVE_LONGLONG)
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228 | void Curl_write64_le(const long long value, unsigned char *buffer)
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229 | #else
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230 | void Curl_write64_le(const __int64 value, unsigned char *buffer)
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231 | #endif
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232 | {
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233 | Curl_write32_le((int)value, buffer);
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234 | Curl_write32_le((int)(value >> 32), buffer + 4);
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235 | }
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236 | #endif /* CURL_SIZEOF_CURL_OFF_T > 4 */
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