Nigel Rantor / azure_c_shared_utility

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Fork of azure_c_shared_utility by Azure IoT

base64.c@25:8507bf644fdf, 2017-04-21 (annotated)

Committer:
AzureIoTClient
Date:
Fri Apr 21 14:51:10 2017 -0700
Revision:
25:8507bf644fdf
Parent:
19:2e0811512ceb 
1.1.13

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Azure.IoT Build 0:fa2de1b79154 1 // Copyright (c) Microsoft. All rights reserved.
Azure.IoT Build 0:fa2de1b79154 2 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
Azure.IoT Build 0:fa2de1b79154 3
Azure.IoT Build 0:fa2de1b79154 4 #include <stdlib.h>
Azure.IoT Build 0:fa2de1b79154 5 #include "azure_c_shared_utility/gballoc.h"
Azure.IoT Build 0:fa2de1b79154 6 #include <stddef.h>
AzureIoTClient 13:920e00014ee3 7 #include <stdint.h>
Azure.IoT Build 0:fa2de1b79154 8 #include "azure_c_shared_utility/base64.h"
Azure.IoT Build 6:c55b013dfc2a 9 #include "azure_c_shared_utility/xlogging.h"
Azure.IoT Build 0:fa2de1b79154 10
AzureIoTClient 13:920e00014ee3 11
AzureIoTClient 13:920e00014ee3 12 #define splitInt(intVal, bytePos) (char)((intVal >> (bytePos << 3)) & 0xFF)
AzureIoTClient 13:920e00014ee3 13 #define joinChars(a, b, c, d) (uint32_t)((uint32_t)a + ((uint32_t)b << 8) + ((uint32_t)c << 16) + ((uint32_t)d << 24))
AzureIoTClient 13:920e00014ee3 14
AzureIoTClient 13:920e00014ee3 15 static char base64char(unsigned char val)
AzureIoTClient 13:920e00014ee3 16 {
AzureIoTClient 13:920e00014ee3 17 char result;
Azure.IoT Build 0:fa2de1b79154 18
AzureIoTClient 13:920e00014ee3 19 if (val < 26)
AzureIoTClient 13:920e00014ee3 20 {
AzureIoTClient 13:920e00014ee3 21 result = 'A' + (char)val;
AzureIoTClient 13:920e00014ee3 22 }
AzureIoTClient 13:920e00014ee3 23 else if (val < 52)
AzureIoTClient 13:920e00014ee3 24 {
AzureIoTClient 13:920e00014ee3 25 result = 'a' + ((char)val - 26);
AzureIoTClient 13:920e00014ee3 26 }
AzureIoTClient 13:920e00014ee3 27 else if (val < 62)
AzureIoTClient 13:920e00014ee3 28 {
AzureIoTClient 13:920e00014ee3 29 result = '0' + ((char)val - 52);
AzureIoTClient 13:920e00014ee3 30 }
AzureIoTClient 13:920e00014ee3 31 else if (val == 62)
AzureIoTClient 13:920e00014ee3 32 {
AzureIoTClient 13:920e00014ee3 33 result = '+';
AzureIoTClient 13:920e00014ee3 34 }
AzureIoTClient 13:920e00014ee3 35 else
AzureIoTClient 13:920e00014ee3 36 {
AzureIoTClient 13:920e00014ee3 37 result = '/';
AzureIoTClient 13:920e00014ee3 38 }
Azure.IoT Build 0:fa2de1b79154 39
AzureIoTClient 13:920e00014ee3 40 return result;
AzureIoTClient 13:920e00014ee3 41 }
AzureIoTClient 13:920e00014ee3 42
AzureIoTClient 13:920e00014ee3 43 static char base64b16(unsigned char val)
AzureIoTClient 13:920e00014ee3 44 {
AzureIoTClient 13:920e00014ee3 45 const uint32_t base64b16values[4] = {
AzureIoTClient 13:920e00014ee3 46 joinChars('A', 'E', 'I', 'M'),
AzureIoTClient 13:920e00014ee3 47 joinChars('Q', 'U', 'Y', 'c'),
AzureIoTClient 13:920e00014ee3 48 joinChars('g', 'k', 'o', 's'),
AzureIoTClient 13:920e00014ee3 49 joinChars('w', '0', '4', '8')
AzureIoTClient 13:920e00014ee3 50 };
AzureIoTClient 13:920e00014ee3 51 return splitInt(base64b16values[val >> 2], (val & 0x03));
AzureIoTClient 13:920e00014ee3 52 }
AzureIoTClient 13:920e00014ee3 53
AzureIoTClient 13:920e00014ee3 54 static char base64b8(unsigned char val)
AzureIoTClient 13:920e00014ee3 55 {
AzureIoTClient 13:920e00014ee3 56 const uint32_t base64b8values = joinChars('A', 'Q', 'g', 'w');
AzureIoTClient 13:920e00014ee3 57 return splitInt(base64b8values, val);
AzureIoTClient 13:920e00014ee3 58 }
Azure.IoT Build 0:fa2de1b79154 59
Azure.IoT Build 0:fa2de1b79154 60 static int base64toValue(char base64character, unsigned char* value)
Azure.IoT Build 0:fa2de1b79154 61 {
Azure.IoT Build 0:fa2de1b79154 62 int result = 0;
Azure.IoT Build 0:fa2de1b79154 63 if (('A' <= base64character) && (base64character <= 'Z'))
Azure.IoT Build 0:fa2de1b79154 64 {
Azure.IoT Build 0:fa2de1b79154 65 *value = base64character - 'A';
Azure.IoT Build 0:fa2de1b79154 66 }
Azure.IoT Build 0:fa2de1b79154 67 else if (('a' <= base64character) && (base64character <= 'z'))
Azure.IoT Build 0:fa2de1b79154 68 {
Azure.IoT Build 0:fa2de1b79154 69 *value = ('Z' - 'A') + 1 + (base64character - 'a');
Azure.IoT Build 0:fa2de1b79154 70 }
Azure.IoT Build 0:fa2de1b79154 71 else if (('0' <= base64character) && (base64character <= '9'))
Azure.IoT Build 0:fa2de1b79154 72 {
Azure.IoT Build 0:fa2de1b79154 73 *value = ('Z' - 'A') + 1 + ('z' - 'a') + 1 + (base64character - '0');
Azure.IoT Build 0:fa2de1b79154 74 }
Azure.IoT Build 0:fa2de1b79154 75 else if ('+' == base64character)
Azure.IoT Build 0:fa2de1b79154 76 {
Azure.IoT Build 0:fa2de1b79154 77 *value = 62;
Azure.IoT Build 0:fa2de1b79154 78 }
Azure.IoT Build 0:fa2de1b79154 79 else if ('/' == base64character)
Azure.IoT Build 0:fa2de1b79154 80 {
Azure.IoT Build 0:fa2de1b79154 81 *value = 63;
Azure.IoT Build 0:fa2de1b79154 82 }
Azure.IoT Build 0:fa2de1b79154 83 else
Azure.IoT Build 0:fa2de1b79154 84 {
Azure.IoT Build 0:fa2de1b79154 85 *value = 0;
Azure.IoT Build 0:fa2de1b79154 86 result = -1;
Azure.IoT Build 0:fa2de1b79154 87 }
Azure.IoT Build 0:fa2de1b79154 88 return result;
Azure.IoT Build 0:fa2de1b79154 89 }
Azure.IoT Build 0:fa2de1b79154 90
Azure.IoT Build 0:fa2de1b79154 91 static size_t numberOfBase64Characters(const char* encodedString)
Azure.IoT Build 0:fa2de1b79154 92 {
Azure.IoT Build 0:fa2de1b79154 93 size_t length = 0;
Azure.IoT Build 0:fa2de1b79154 94 unsigned char junkChar;
Azure.IoT Build 0:fa2de1b79154 95 while (base64toValue(encodedString[length],&junkChar) != -1)
Azure.IoT Build 0:fa2de1b79154 96 {
Azure.IoT Build 0:fa2de1b79154 97 length++;
Azure.IoT Build 0:fa2de1b79154 98 }
Azure.IoT Build 0:fa2de1b79154 99 return length;
Azure.IoT Build 0:fa2de1b79154 100 }
AzureIoTClient 5:921351ce6973 101
AzureIoTClient 5:921351ce6973 102 /*returns the count of original bytes before being base64 encoded*/
AzureIoTClient 5:921351ce6973 103 /*notice NO validation of the content of encodedString. Its length is validated to be a multiple of 4.*/
Azure.IoT Build 0:fa2de1b79154 104 static size_t Base64decode_len(const char *encodedString)
Azure.IoT Build 0:fa2de1b79154 105 {
AzureIoTClient 5:921351ce6973 106 size_t result;
AzureIoTClient 5:921351ce6973 107 size_t sourceLength = strlen(encodedString);
AzureIoTClient 5:921351ce6973 108
AzureIoTClient 5:921351ce6973 109 if (sourceLength == 0)
Azure.IoT Build 0:fa2de1b79154 110 {
AzureIoTClient 5:921351ce6973 111 result = 0;
AzureIoTClient 5:921351ce6973 112 }
AzureIoTClient 5:921351ce6973 113 else
AzureIoTClient 5:921351ce6973 114 {
AzureIoTClient 5:921351ce6973 115 result = sourceLength / 4 * 3;
AzureIoTClient 5:921351ce6973 116 if (encodedString[sourceLength - 1] == '=')
Azure.IoT Build 0:fa2de1b79154 117 {
AzureIoTClient 5:921351ce6973 118 if (encodedString[sourceLength - 2] == '=')
Azure.IoT Build 0:fa2de1b79154 119 {
AzureIoTClient 5:921351ce6973 120 result --;
Azure.IoT Build 0:fa2de1b79154 121 }
AzureIoTClient 5:921351ce6973 122 result--;
Azure.IoT Build 0:fa2de1b79154 123 }
Azure.IoT Build 0:fa2de1b79154 124 }
AzureIoTClient 5:921351ce6973 125 return result;
Azure.IoT Build 0:fa2de1b79154 126 }
Azure.IoT Build 0:fa2de1b79154 127
Azure.IoT Build 0:fa2de1b79154 128 static void Base64decode(unsigned char *decodedString, const char *base64String)
Azure.IoT Build 0:fa2de1b79154 129 {
Azure.IoT Build 0:fa2de1b79154 130
Azure.IoT Build 0:fa2de1b79154 131 size_t numberOfEncodedChars;
Azure.IoT Build 0:fa2de1b79154 132 size_t indexOfFirstEncodedChar;
Azure.IoT Build 0:fa2de1b79154 133 size_t decodedIndex;
Azure.IoT Build 0:fa2de1b79154 134
Azure.IoT Build 0:fa2de1b79154 135 //
Azure.IoT Build 0:fa2de1b79154 136 // We can only operate on individual bytes. If we attempt to work
Azure.IoT Build 0:fa2de1b79154 137 // on anything larger we could get an alignment fault on some
Azure.IoT Build 0:fa2de1b79154 138 // architectures
Azure.IoT Build 0:fa2de1b79154 139 //
Azure.IoT Build 0:fa2de1b79154 140
Azure.IoT Build 0:fa2de1b79154 141 numberOfEncodedChars = numberOfBase64Characters(base64String);
Azure.IoT Build 0:fa2de1b79154 142 indexOfFirstEncodedChar = 0;
Azure.IoT Build 0:fa2de1b79154 143 decodedIndex = 0;
Azure.IoT Build 0:fa2de1b79154 144 while (numberOfEncodedChars >= 4)
Azure.IoT Build 0:fa2de1b79154 145 {
Azure.IoT Build 0:fa2de1b79154 146 unsigned char c1;
Azure.IoT Build 0:fa2de1b79154 147 unsigned char c2;
Azure.IoT Build 0:fa2de1b79154 148 unsigned char c3;
Azure.IoT Build 0:fa2de1b79154 149 unsigned char c4;
Azure.IoT Build 0:fa2de1b79154 150 (void)base64toValue(base64String[indexOfFirstEncodedChar], &c1);
Azure.IoT Build 0:fa2de1b79154 151 (void)base64toValue(base64String[indexOfFirstEncodedChar + 1], &c2);
Azure.IoT Build 0:fa2de1b79154 152 (void)base64toValue(base64String[indexOfFirstEncodedChar + 2], &c3);
Azure.IoT Build 0:fa2de1b79154 153 (void)base64toValue(base64String[indexOfFirstEncodedChar + 3], &c4);
Azure.IoT Build 0:fa2de1b79154 154 decodedString[decodedIndex] = (c1 << 2) | (c2 >> 4);
Azure.IoT Build 0:fa2de1b79154 155 decodedIndex++;
Azure.IoT Build 0:fa2de1b79154 156 decodedString[decodedIndex] = ((c2 & 0x0f) << 4) | (c3 >> 2);
Azure.IoT Build 0:fa2de1b79154 157 decodedIndex++;
Azure.IoT Build 0:fa2de1b79154 158 decodedString[decodedIndex] = ((c3 & 0x03) << 6) | c4;
Azure.IoT Build 0:fa2de1b79154 159 decodedIndex++;
Azure.IoT Build 0:fa2de1b79154 160 numberOfEncodedChars -= 4;
Azure.IoT Build 0:fa2de1b79154 161 indexOfFirstEncodedChar += 4;
Azure.IoT Build 0:fa2de1b79154 162
Azure.IoT Build 0:fa2de1b79154 163 }
Azure.IoT Build 0:fa2de1b79154 164
Azure.IoT Build 0:fa2de1b79154 165 if (numberOfEncodedChars == 2)
Azure.IoT Build 0:fa2de1b79154 166 {
Azure.IoT Build 0:fa2de1b79154 167 unsigned char c1;
Azure.IoT Build 0:fa2de1b79154 168 unsigned char c2;
Azure.IoT Build 0:fa2de1b79154 169 (void)base64toValue(base64String[indexOfFirstEncodedChar], &c1);
Azure.IoT Build 0:fa2de1b79154 170 (void)base64toValue(base64String[indexOfFirstEncodedChar + 1], &c2);
Azure.IoT Build 0:fa2de1b79154 171 decodedString[decodedIndex] = (c1 << 2) | (c2 >> 4);
Azure.IoT Build 0:fa2de1b79154 172 }
Azure.IoT Build 0:fa2de1b79154 173 else if (numberOfEncodedChars == 3)
Azure.IoT Build 0:fa2de1b79154 174 {
Azure.IoT Build 0:fa2de1b79154 175 unsigned char c1;
Azure.IoT Build 0:fa2de1b79154 176 unsigned char c2;
Azure.IoT Build 0:fa2de1b79154 177 unsigned char c3;
Azure.IoT Build 0:fa2de1b79154 178 (void)base64toValue(base64String[indexOfFirstEncodedChar], &c1);
Azure.IoT Build 0:fa2de1b79154 179 (void)base64toValue(base64String[indexOfFirstEncodedChar + 1], &c2);
Azure.IoT Build 0:fa2de1b79154 180 (void)base64toValue(base64String[indexOfFirstEncodedChar + 2], &c3);
Azure.IoT Build 0:fa2de1b79154 181 decodedString[decodedIndex] = (c1 << 2) | (c2 >> 4);
Azure.IoT Build 0:fa2de1b79154 182 decodedIndex++;
Azure.IoT Build 0:fa2de1b79154 183 decodedString[decodedIndex] = ((c2 & 0x0f) << 4) | (c3 >> 2);
Azure.IoT Build 0:fa2de1b79154 184 }
Azure.IoT Build 0:fa2de1b79154 185 }
Azure.IoT Build 0:fa2de1b79154 186
Azure.IoT Build 0:fa2de1b79154 187 BUFFER_HANDLE Base64_Decoder(const char* source)
Azure.IoT Build 0:fa2de1b79154 188 {
AzureIoTClient 5:921351ce6973 189 BUFFER_HANDLE result;
Azure.IoT Build 0:fa2de1b79154 190 /*Codes_SRS_BASE64_06_008: [If source is NULL then Base64_Decode shall return NULL.]*/
AzureIoTClient 5:921351ce6973 191 if (source == NULL)
Azure.IoT Build 0:fa2de1b79154 192 {
AzureIoTClient 5:921351ce6973 193 LogError("invalid parameter const char* source=%p", source);
AzureIoTClient 5:921351ce6973 194 result = NULL;
AzureIoTClient 5:921351ce6973 195 }
AzureIoTClient 5:921351ce6973 196 else
AzureIoTClient 5:921351ce6973 197 {
AzureIoTClient 5:921351ce6973 198 if ((strlen(source) % 4) != 0)
Azure.IoT Build 0:fa2de1b79154 199 {
Azure.IoT Build 0:fa2de1b79154 200 /*Codes_SRS_BASE64_06_011: [If the source string has an invalid length for a base 64 encoded string then Base64_Decode shall return NULL.]*/
AzureIoTClient 1:9190c0f4d23a 201 LogError("Invalid length Base64 string!");
AzureIoTClient 5:921351ce6973 202 result = NULL;
Azure.IoT Build 0:fa2de1b79154 203 }
Azure.IoT Build 0:fa2de1b79154 204 else
Azure.IoT Build 0:fa2de1b79154 205 {
Azure.IoT Build 0:fa2de1b79154 206 if ((result = BUFFER_new()) == NULL)
Azure.IoT Build 0:fa2de1b79154 207 {
Azure.IoT Build 0:fa2de1b79154 208 /*Codes_SRS_BASE64_06_010: [If there is any memory allocation failure during the decode then Base64_Decode shall return NULL.]*/
AzureIoTClient 1:9190c0f4d23a 209 LogError("Could not create a buffer to decoding.");
Azure.IoT Build 0:fa2de1b79154 210 }
Azure.IoT Build 0:fa2de1b79154 211 else
Azure.IoT Build 0:fa2de1b79154 212 {
Azure.IoT Build 0:fa2de1b79154 213 size_t sizeOfOutputBuffer = Base64decode_len(source);
Azure.IoT Build 0:fa2de1b79154 214 /*Codes_SRS_BASE64_06_009: [If the string pointed to by source is zero length then the handle returned shall refer to a zero length buffer.]*/
Azure.IoT Build 0:fa2de1b79154 215 if (sizeOfOutputBuffer > 0)
Azure.IoT Build 0:fa2de1b79154 216 {
Azure.IoT Build 0:fa2de1b79154 217 if (BUFFER_pre_build(result, sizeOfOutputBuffer) != 0)
Azure.IoT Build 0:fa2de1b79154 218 {
Azure.IoT Build 0:fa2de1b79154 219 /*Codes_SRS_BASE64_06_010: [If there is any memory allocation failure during the decode then Base64_Decode shall return NULL.]*/
AzureIoTClient 1:9190c0f4d23a 220 LogError("Could not prebuild a buffer for base 64 decoding.");
Azure.IoT Build 0:fa2de1b79154 221 BUFFER_delete(result);
Azure.IoT Build 0:fa2de1b79154 222 result = NULL;
Azure.IoT Build 0:fa2de1b79154 223 }
Azure.IoT Build 0:fa2de1b79154 224 else
Azure.IoT Build 0:fa2de1b79154 225 {
Azure.IoT Build 0:fa2de1b79154 226 Base64decode(BUFFER_u_char(result), source);
Azure.IoT Build 0:fa2de1b79154 227 }
Azure.IoT Build 0:fa2de1b79154 228 }
Azure.IoT Build 0:fa2de1b79154 229 }
Azure.IoT Build 0:fa2de1b79154 230 }
Azure.IoT Build 0:fa2de1b79154 231 }
Azure.IoT Build 0:fa2de1b79154 232 return result;
Azure.IoT Build 0:fa2de1b79154 233 }
Azure.IoT Build 0:fa2de1b79154 234
Azure.IoT Build 0:fa2de1b79154 235
Azure.IoT Build 0:fa2de1b79154 236 static STRING_HANDLE Base64_Encode_Internal(const unsigned char* source, size_t size)
Azure.IoT Build 0:fa2de1b79154 237 {
Azure.IoT Build 0:fa2de1b79154 238 STRING_HANDLE result;
Azure.IoT Build 0:fa2de1b79154 239 size_t neededSize = 0;
Azure.IoT Build 0:fa2de1b79154 240 char* encoded;
Azure.IoT Build 0:fa2de1b79154 241 size_t currentPosition = 0;
Azure.IoT Build 0:fa2de1b79154 242 neededSize += (size == 0) ? (0) : ((((size - 1) / 3) + 1) * 4);
Azure.IoT Build 0:fa2de1b79154 243 neededSize += 1; /*+1 because \0 at the end of the string*/
AzureIoTClient 25:8507bf644fdf 244 /*Codes_SRS_BASE64_06_006: [If when allocating memory to produce the encoding a failure occurs then Base64_Encoder shall return NULL.]*/
Azure.IoT Build 0:fa2de1b79154 245 encoded = (char*)malloc(neededSize);
Azure.IoT Build 0:fa2de1b79154 246 if (encoded == NULL)
Azure.IoT Build 0:fa2de1b79154 247 {
Azure.IoT Build 0:fa2de1b79154 248 result = NULL;
AzureIoTClient 25:8507bf644fdf 249 LogError("Base64_Encoder:: Allocation failed.");
Azure.IoT Build 0:fa2de1b79154 250 }
Azure.IoT Build 0:fa2de1b79154 251 else
Azure.IoT Build 0:fa2de1b79154 252 {
Azure.IoT Build 0:fa2de1b79154 253 /*b0 b1(+1) b2(+2)
Azure.IoT Build 0:fa2de1b79154 254 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
Azure.IoT Build 0:fa2de1b79154 255 |----c1---| |----c2---| |----c3---| |----c4---|
Azure.IoT Build 0:fa2de1b79154 256 */
Azure.IoT Build 0:fa2de1b79154 257
Azure.IoT Build 0:fa2de1b79154 258 size_t destinationPosition = 0;
Azure.IoT Build 0:fa2de1b79154 259 while (size - currentPosition >= 3)
Azure.IoT Build 0:fa2de1b79154 260 {
AzureIoTClient 13:920e00014ee3 261 char c1 = base64char(source[currentPosition] >> 2);
AzureIoTClient 13:920e00014ee3 262 char c2 = base64char(
Azure.IoT Build 0:fa2de1b79154 263 ((source[currentPosition] & 3) << 4) |
Azure.IoT Build 0:fa2de1b79154 264 (source[currentPosition + 1] >> 4)
AzureIoTClient 13:920e00014ee3 265 );
AzureIoTClient 13:920e00014ee3 266 char c3 = base64char(
Azure.IoT Build 0:fa2de1b79154 267 ((source[currentPosition + 1] & 0x0F) << 2) |
Azure.IoT Build 0:fa2de1b79154 268 ((source[currentPosition + 2] >> 6) & 3)
AzureIoTClient 13:920e00014ee3 269 );
AzureIoTClient 13:920e00014ee3 270 char c4 = base64char(
Azure.IoT Build 0:fa2de1b79154 271 source[currentPosition + 2] & 0x3F
AzureIoTClient 13:920e00014ee3 272 );
Azure.IoT Build 0:fa2de1b79154 273 currentPosition += 3;
Azure.IoT Build 0:fa2de1b79154 274 encoded[destinationPosition++] = c1;
Azure.IoT Build 0:fa2de1b79154 275 encoded[destinationPosition++] = c2;
Azure.IoT Build 0:fa2de1b79154 276 encoded[destinationPosition++] = c3;
Azure.IoT Build 0:fa2de1b79154 277 encoded[destinationPosition++] = c4;
Azure.IoT Build 0:fa2de1b79154 278
Azure.IoT Build 0:fa2de1b79154 279 }
Azure.IoT Build 0:fa2de1b79154 280 if (size - currentPosition == 2)
Azure.IoT Build 0:fa2de1b79154 281 {
AzureIoTClient 13:920e00014ee3 282 char c1 = base64char(source[currentPosition] >> 2);
AzureIoTClient 13:920e00014ee3 283 char c2 = base64char(
Azure.IoT Build 0:fa2de1b79154 284 ((source[currentPosition] & 0x03) << 4) |
Azure.IoT Build 0:fa2de1b79154 285 (source[currentPosition + 1] >> 4)
AzureIoTClient 13:920e00014ee3 286 );
AzureIoTClient 13:920e00014ee3 287 char c3 = base64b16(source[currentPosition + 1] & 0x0F);
Azure.IoT Build 0:fa2de1b79154 288 encoded[destinationPosition++] = c1;
Azure.IoT Build 0:fa2de1b79154 289 encoded[destinationPosition++] = c2;
Azure.IoT Build 0:fa2de1b79154 290 encoded[destinationPosition++] = c3;
Azure.IoT Build 0:fa2de1b79154 291 encoded[destinationPosition++] = '=';
Azure.IoT Build 0:fa2de1b79154 292 }
Azure.IoT Build 0:fa2de1b79154 293 else if (size - currentPosition == 1)
Azure.IoT Build 0:fa2de1b79154 294 {
AzureIoTClient 13:920e00014ee3 295 char c1 = base64char(source[currentPosition] >> 2);
AzureIoTClient 13:920e00014ee3 296 char c2 = base64b8(source[currentPosition] & 0x03);
Azure.IoT Build 0:fa2de1b79154 297 encoded[destinationPosition++] = c1;
Azure.IoT Build 0:fa2de1b79154 298 encoded[destinationPosition++] = c2;
Azure.IoT Build 0:fa2de1b79154 299 encoded[destinationPosition++] = '=';
Azure.IoT Build 0:fa2de1b79154 300 encoded[destinationPosition++] = '=';
Azure.IoT Build 0:fa2de1b79154 301 }
Azure.IoT Build 0:fa2de1b79154 302
Azure.IoT Build 0:fa2de1b79154 303 /*null terminating the string*/
Azure.IoT Build 0:fa2de1b79154 304 encoded[destinationPosition] = '\0';
AzureIoTClient 25:8507bf644fdf 305 /*Codes_SRS_BASE64_06_007: [Otherwise Base64_Encoder shall return a pointer to STRING, that string contains the base 64 encoding of input.]*/
Azure.IoT Build 0:fa2de1b79154 306 result = STRING_new_with_memory(encoded);
Azure.IoT Build 0:fa2de1b79154 307 if (result == NULL)
Azure.IoT Build 0:fa2de1b79154 308 {
Azure.IoT Build 0:fa2de1b79154 309 free(encoded);
AzureIoTClient 25:8507bf644fdf 310 LogError("Base64_Encoder:: Allocation failed for return value.");
Azure.IoT Build 0:fa2de1b79154 311 }
Azure.IoT Build 0:fa2de1b79154 312 }
Azure.IoT Build 0:fa2de1b79154 313 return result;
Azure.IoT Build 0:fa2de1b79154 314 }
Azure.IoT Build 0:fa2de1b79154 315
Azure.IoT Build 0:fa2de1b79154 316 STRING_HANDLE Base64_Encode_Bytes(const unsigned char* source, size_t size)
Azure.IoT Build 0:fa2de1b79154 317 {
Azure.IoT Build 0:fa2de1b79154 318 STRING_HANDLE result;
Azure.IoT Build 0:fa2de1b79154 319 /*Codes_SRS_BASE64_02_001: [If source is NULL then Base64_Encode_Bytes shall return NULL.] */
Azure.IoT Build 0:fa2de1b79154 320 if (source == NULL)
Azure.IoT Build 0:fa2de1b79154 321 {
Azure.IoT Build 0:fa2de1b79154 322 result = NULL;
Azure.IoT Build 0:fa2de1b79154 323 }
Azure.IoT Build 0:fa2de1b79154 324 /*Codes_SRS_BASE64_02_002: [If source is not NULL and size is zero, then Base64_Encode_Bytes shall produce an empty STRING_HANDLE.] */
Azure.IoT Build 0:fa2de1b79154 325 else if (size == 0)
Azure.IoT Build 0:fa2de1b79154 326 {
Azure.IoT Build 0:fa2de1b79154 327 result = STRING_new(); /*empty string*/
Azure.IoT Build 0:fa2de1b79154 328 }
Azure.IoT Build 0:fa2de1b79154 329 else
Azure.IoT Build 0:fa2de1b79154 330 {
Azure.IoT Build 0:fa2de1b79154 331 result = Base64_Encode_Internal(source, size);
Azure.IoT Build 0:fa2de1b79154 332 }
Azure.IoT Build 0:fa2de1b79154 333 return result;
Azure.IoT Build 0:fa2de1b79154 334 }
Azure.IoT Build 0:fa2de1b79154 335
AzureIoTClient 25:8507bf644fdf 336 STRING_HANDLE Base64_Encoder(BUFFER_HANDLE input)
Azure.IoT Build 0:fa2de1b79154 337 {
Azure.IoT Build 0:fa2de1b79154 338 STRING_HANDLE result;
Azure.IoT Build 0:fa2de1b79154 339 /*the following will happen*/
Azure.IoT Build 0:fa2de1b79154 340 /*1. the "data" of the binary shall be "eaten" 3 characters at a time and produce 4 base64 encoded characters for as long as there are more than 3 characters still to process*/
Azure.IoT Build 0:fa2de1b79154 341 /*2. the remaining characters (1 or 2) shall be encoded.*/
Azure.IoT Build 0:fa2de1b79154 342 /*there's a level of assumption that 'a' corresponds to 0b000000 and that '_' corresponds to 0b111111*/
Azure.IoT Build 0:fa2de1b79154 343 /*the encoding will use the optional [=] or [==] at the end of the encoded string, so that other less standard aware libraries can do their work*/
Azure.IoT Build 0:fa2de1b79154 344 /*these are the bits of the 3 normal bytes to be encoded*/
Azure.IoT Build 0:fa2de1b79154 345
AzureIoTClient 25:8507bf644fdf 346 /*Codes_SRS_BASE64_06_001: [If input is NULL then Base64_Encoder shall return NULL.]*/
Azure.IoT Build 0:fa2de1b79154 347 if (input == NULL)
Azure.IoT Build 0:fa2de1b79154 348 {
Azure.IoT Build 0:fa2de1b79154 349 result = NULL;
AzureIoTClient 25:8507bf644fdf 350 LogError("Base64_Encoder:: NULL input");
Azure.IoT Build 0:fa2de1b79154 351 }
Azure.IoT Build 0:fa2de1b79154 352 else
Azure.IoT Build 0:fa2de1b79154 353 {
Azure.IoT Build 0:fa2de1b79154 354 size_t inputSize;
Azure.IoT Build 0:fa2de1b79154 355 const unsigned char* inputBinary;
Azure.IoT Build 0:fa2de1b79154 356 if ((BUFFER_content(input, &inputBinary) != 0) ||
Azure.IoT Build 0:fa2de1b79154 357 (BUFFER_size(input, &inputSize) != 0))
Azure.IoT Build 0:fa2de1b79154 358 {
Azure.IoT Build 0:fa2de1b79154 359 result = NULL;
AzureIoTClient 25:8507bf644fdf 360 LogError("Base64_Encoder:: BUFFER_routines failure.");
Azure.IoT Build 0:fa2de1b79154 361 }
Azure.IoT Build 0:fa2de1b79154 362 else
Azure.IoT Build 0:fa2de1b79154 363 {
Azure.IoT Build 0:fa2de1b79154 364 result = Base64_Encode_Internal(inputBinary, inputSize);
Azure.IoT Build 0:fa2de1b79154 365 }
Azure.IoT Build 0:fa2de1b79154 366 }
Azure.IoT Build 0:fa2de1b79154 367 return result;
Azure.IoT Build 0:fa2de1b79154 368 }