Xin Zhang / azure-iot-c-sdk-f767zi

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Dependents:   samplemqtt

c-utility/src/base32.c@0:f7f1f0d76dd6, 2018-08-23 (annotated)

Committer:
XinZhangMS
Date:
Thu Aug 23 06:52:14 2018 +0000
Revision:
0:f7f1f0d76dd6
azure-c-sdk for mbed os supporting NUCLEO_F767ZI

Who changed what in which revision?

UserRevisionLine numberNew contents of line
XinZhangMS 0:f7f1f0d76dd6 1 // Copyright (c) Microsoft. All rights reserved.
XinZhangMS 0:f7f1f0d76dd6 2 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
XinZhangMS 0:f7f1f0d76dd6 3
XinZhangMS 0:f7f1f0d76dd6 4 #include <stdlib.h>
XinZhangMS 0:f7f1f0d76dd6 5 #include <stddef.h>
XinZhangMS 0:f7f1f0d76dd6 6 #include <stdint.h>
XinZhangMS 0:f7f1f0d76dd6 7 #include <ctype.h>
XinZhangMS 0:f7f1f0d76dd6 8 #include "azure_c_shared_utility/buffer_.h"
XinZhangMS 0:f7f1f0d76dd6 9 #include "azure_c_shared_utility/xlogging.h"
XinZhangMS 0:f7f1f0d76dd6 10 #include "azure_c_shared_utility/gballoc.h"
XinZhangMS 0:f7f1f0d76dd6 11 #include "azure_c_shared_utility/strings.h"
XinZhangMS 0:f7f1f0d76dd6 12
XinZhangMS 0:f7f1f0d76dd6 13 #include "azure_c_shared_utility/base32.h"
XinZhangMS 0:f7f1f0d76dd6 14
XinZhangMS 0:f7f1f0d76dd6 15 static const unsigned char BASE32_EQUAL_SIGN = 32;
XinZhangMS 0:f7f1f0d76dd6 16
XinZhangMS 0:f7f1f0d76dd6 17 static const char BASE32_VALUES[] = "abcdefghijklmnopqrstuvwxyz234567=";
XinZhangMS 0:f7f1f0d76dd6 18 #define TARGET_BLOCK_SIZE 5
XinZhangMS 0:f7f1f0d76dd6 19 #define INVALID_CHAR_POS 260
XinZhangMS 0:f7f1f0d76dd6 20
XinZhangMS 0:f7f1f0d76dd6 21 #define BASE32_INPUT_SIZE 8
XinZhangMS 0:f7f1f0d76dd6 22
XinZhangMS 0:f7f1f0d76dd6 23 #define ASCII_VALUE_MAX 0x80
XinZhangMS 0:f7f1f0d76dd6 24
XinZhangMS 0:f7f1f0d76dd6 25 static size_t base32_encoding_length(size_t src_len)
XinZhangMS 0:f7f1f0d76dd6 26 {
XinZhangMS 0:f7f1f0d76dd6 27 return (((src_len + TARGET_BLOCK_SIZE - 1) / TARGET_BLOCK_SIZE) * 8);
XinZhangMS 0:f7f1f0d76dd6 28 }
XinZhangMS 0:f7f1f0d76dd6 29
XinZhangMS 0:f7f1f0d76dd6 30 static size_t base32_decoding_length(size_t src_len)
XinZhangMS 0:f7f1f0d76dd6 31 {
XinZhangMS 0:f7f1f0d76dd6 32 return ((src_len*TARGET_BLOCK_SIZE) / 8);
XinZhangMS 0:f7f1f0d76dd6 33 }
XinZhangMS 0:f7f1f0d76dd6 34
XinZhangMS 0:f7f1f0d76dd6 35 static unsigned char convert_value_to_base32_char(unsigned char value)
XinZhangMS 0:f7f1f0d76dd6 36 {
XinZhangMS 0:f7f1f0d76dd6 37 unsigned char result;
XinZhangMS 0:f7f1f0d76dd6 38
XinZhangMS 0:f7f1f0d76dd6 39 if (value >= 50 && value <= 55)
XinZhangMS 0:f7f1f0d76dd6 40 {
XinZhangMS 0:f7f1f0d76dd6 41 result = 0x1a+(value-50);
XinZhangMS 0:f7f1f0d76dd6 42 }
XinZhangMS 0:f7f1f0d76dd6 43 else if (value == 61)
XinZhangMS 0:f7f1f0d76dd6 44 {
XinZhangMS 0:f7f1f0d76dd6 45 result = 0x20;
XinZhangMS 0:f7f1f0d76dd6 46 }
XinZhangMS 0:f7f1f0d76dd6 47 else if ((value <= 49) || (value >= 56 && value <= 64))
XinZhangMS 0:f7f1f0d76dd6 48 {
XinZhangMS 0:f7f1f0d76dd6 49 result = 0xFF;
XinZhangMS 0:f7f1f0d76dd6 50 }
XinZhangMS 0:f7f1f0d76dd6 51 else if (value >= 65 && value <= 90)
XinZhangMS 0:f7f1f0d76dd6 52 {
XinZhangMS 0:f7f1f0d76dd6 53 result = 0x00 + (value - 65);
XinZhangMS 0:f7f1f0d76dd6 54 }
XinZhangMS 0:f7f1f0d76dd6 55 else if (value >= 91 && value <= 96)
XinZhangMS 0:f7f1f0d76dd6 56 {
XinZhangMS 0:f7f1f0d76dd6 57 result = 0xFF;
XinZhangMS 0:f7f1f0d76dd6 58 }
XinZhangMS 0:f7f1f0d76dd6 59 else if (value >= 97 && value <= 123)
XinZhangMS 0:f7f1f0d76dd6 60 {
XinZhangMS 0:f7f1f0d76dd6 61 result = 0x00 + (value - 97);
XinZhangMS 0:f7f1f0d76dd6 62 }
XinZhangMS 0:f7f1f0d76dd6 63 else // value > 123
XinZhangMS 0:f7f1f0d76dd6 64 {
XinZhangMS 0:f7f1f0d76dd6 65 result = 0xFF;
XinZhangMS 0:f7f1f0d76dd6 66 }
XinZhangMS 0:f7f1f0d76dd6 67 return result;
XinZhangMS 0:f7f1f0d76dd6 68 }
XinZhangMS 0:f7f1f0d76dd6 69
XinZhangMS 0:f7f1f0d76dd6 70 static char* base32_encode_impl(const unsigned char* source, size_t src_size)
XinZhangMS 0:f7f1f0d76dd6 71 {
XinZhangMS 0:f7f1f0d76dd6 72 char* result;
XinZhangMS 0:f7f1f0d76dd6 73
XinZhangMS 0:f7f1f0d76dd6 74 // Allocate target buffer
XinZhangMS 0:f7f1f0d76dd6 75 size_t output_len = base32_encoding_length(src_size);
XinZhangMS 0:f7f1f0d76dd6 76 /* Codes_SRS_BASE32_07_009: [ base32_encode_impl shall allocate the buffer to the size of the encoding value. ] */
XinZhangMS 0:f7f1f0d76dd6 77 if ((result = (char*)malloc(output_len + 1)) == NULL)
XinZhangMS 0:f7f1f0d76dd6 78 {
XinZhangMS 0:f7f1f0d76dd6 79 LogError("Failure allocating output buffer");
XinZhangMS 0:f7f1f0d76dd6 80 }
XinZhangMS 0:f7f1f0d76dd6 81 else
XinZhangMS 0:f7f1f0d76dd6 82 {
XinZhangMS 0:f7f1f0d76dd6 83 const unsigned char* iterator = source;
XinZhangMS 0:f7f1f0d76dd6 84 size_t block_len = 0;
XinZhangMS 0:f7f1f0d76dd6 85 size_t result_len = 0;
XinZhangMS 0:f7f1f0d76dd6 86 unsigned char pos1 = 0;
XinZhangMS 0:f7f1f0d76dd6 87 unsigned char pos2 = 0;
XinZhangMS 0:f7f1f0d76dd6 88 unsigned char pos3 = 0;
XinZhangMS 0:f7f1f0d76dd6 89 unsigned char pos4 = 0;
XinZhangMS 0:f7f1f0d76dd6 90 unsigned char pos5 = 0;
XinZhangMS 0:f7f1f0d76dd6 91 unsigned char pos6 = 0;
XinZhangMS 0:f7f1f0d76dd6 92 unsigned char pos7 = 0;
XinZhangMS 0:f7f1f0d76dd6 93 unsigned char pos8 = 0;
XinZhangMS 0:f7f1f0d76dd6 94
XinZhangMS 0:f7f1f0d76dd6 95 memset(result, 0, output_len + 1);
XinZhangMS 0:f7f1f0d76dd6 96
XinZhangMS 0:f7f1f0d76dd6 97 // Go through the source buffer sectioning off blocks of 5
XinZhangMS 0:f7f1f0d76dd6 98 /* Codes_SRS_BASE32_07_010: [ base32_encode_impl shall look through source and separate each block into 5 bit chunks ] */
XinZhangMS 0:f7f1f0d76dd6 99 while (src_size >= 1 && result != NULL)
XinZhangMS 0:f7f1f0d76dd6 100 {
XinZhangMS 0:f7f1f0d76dd6 101 pos1 = pos2 = pos3 = pos4 = pos5 = pos6 = pos7 = pos8 = 0;
XinZhangMS 0:f7f1f0d76dd6 102 block_len = src_size > TARGET_BLOCK_SIZE ? TARGET_BLOCK_SIZE : src_size;
XinZhangMS 0:f7f1f0d76dd6 103 // Fall through switch block to process the 5 (or smaller) block
XinZhangMS 0:f7f1f0d76dd6 104 switch (block_len)
XinZhangMS 0:f7f1f0d76dd6 105 {
XinZhangMS 0:f7f1f0d76dd6 106 case 5:
XinZhangMS 0:f7f1f0d76dd6 107 pos8 = (iterator[4] & 0x1f);
XinZhangMS 0:f7f1f0d76dd6 108 pos7 = ((iterator[4] & 0xe0) >> 5);
XinZhangMS 0:f7f1f0d76dd6 109 // fall through
XinZhangMS 0:f7f1f0d76dd6 110 case 4:
XinZhangMS 0:f7f1f0d76dd6 111 pos7 |= ((iterator[3] & 0x03) << 3);
XinZhangMS 0:f7f1f0d76dd6 112 pos6 = ((iterator[3] & 0x7c) >> 2);
XinZhangMS 0:f7f1f0d76dd6 113 pos5 = ((iterator[3] & 0x80) >> 7);
XinZhangMS 0:f7f1f0d76dd6 114 // fall through
XinZhangMS 0:f7f1f0d76dd6 115 case 3:
XinZhangMS 0:f7f1f0d76dd6 116 pos5 |= ((iterator[2] & 0x0f) << 1);
XinZhangMS 0:f7f1f0d76dd6 117 pos4 = ((iterator[2] & 0xf0) >> 4);
XinZhangMS 0:f7f1f0d76dd6 118 // fall through
XinZhangMS 0:f7f1f0d76dd6 119 case 2:
XinZhangMS 0:f7f1f0d76dd6 120 pos4 |= ((iterator[1] & 0x01) << 4);
XinZhangMS 0:f7f1f0d76dd6 121 pos3 = ((iterator[1] & 0x3e) >> 1);
XinZhangMS 0:f7f1f0d76dd6 122 pos2 = ((iterator[1] & 0xc0) >> 6);
XinZhangMS 0:f7f1f0d76dd6 123 // fall through
XinZhangMS 0:f7f1f0d76dd6 124 case 1:
XinZhangMS 0:f7f1f0d76dd6 125 pos2 |= ((iterator[0] & 0x07) << 2);
XinZhangMS 0:f7f1f0d76dd6 126 pos1 = ((iterator[0] & 0xf8) >> 3);
XinZhangMS 0:f7f1f0d76dd6 127 break;
XinZhangMS 0:f7f1f0d76dd6 128 }
XinZhangMS 0:f7f1f0d76dd6 129 // Move the iterator the block size
XinZhangMS 0:f7f1f0d76dd6 130 iterator += block_len;
XinZhangMS 0:f7f1f0d76dd6 131 // and decrement the src_size;
XinZhangMS 0:f7f1f0d76dd6 132 src_size -= block_len;
XinZhangMS 0:f7f1f0d76dd6 133
XinZhangMS 0:f7f1f0d76dd6 134 /* Codes_SRS_BASE32_07_012: [ If the src_size is not divisible by 8, base32_encode_impl shall pad the remaining places with =. ] */
XinZhangMS 0:f7f1f0d76dd6 135 switch (block_len)
XinZhangMS 0:f7f1f0d76dd6 136 {
XinZhangMS 0:f7f1f0d76dd6 137 case 1: pos3 = pos4 = 32; // fall through
XinZhangMS 0:f7f1f0d76dd6 138 case 2: pos5 = 32; // fall through
XinZhangMS 0:f7f1f0d76dd6 139 case 3: pos6 = pos7 = 32; // fall through
XinZhangMS 0:f7f1f0d76dd6 140 case 4: pos8 = 32; // fall through
XinZhangMS 0:f7f1f0d76dd6 141 case 5:
XinZhangMS 0:f7f1f0d76dd6 142 break;
XinZhangMS 0:f7f1f0d76dd6 143 }
XinZhangMS 0:f7f1f0d76dd6 144
XinZhangMS 0:f7f1f0d76dd6 145 /* Codes_SRS_BASE32_07_011: [ base32_encode_impl shall then map the 5 bit chunks into one of the BASE32 values (a-z,2,3,4,5,6,7) values. ] */
XinZhangMS 0:f7f1f0d76dd6 146 result[result_len++] = BASE32_VALUES[pos1];
XinZhangMS 0:f7f1f0d76dd6 147 result[result_len++] = BASE32_VALUES[pos2];
XinZhangMS 0:f7f1f0d76dd6 148 result[result_len++] = BASE32_VALUES[pos3];
XinZhangMS 0:f7f1f0d76dd6 149 result[result_len++] = BASE32_VALUES[pos4];
XinZhangMS 0:f7f1f0d76dd6 150 result[result_len++] = BASE32_VALUES[pos5];
XinZhangMS 0:f7f1f0d76dd6 151 result[result_len++] = BASE32_VALUES[pos6];
XinZhangMS 0:f7f1f0d76dd6 152 result[result_len++] = BASE32_VALUES[pos7];
XinZhangMS 0:f7f1f0d76dd6 153 result[result_len++] = BASE32_VALUES[pos8];
XinZhangMS 0:f7f1f0d76dd6 154 }
XinZhangMS 0:f7f1f0d76dd6 155 }
XinZhangMS 0:f7f1f0d76dd6 156 return result;
XinZhangMS 0:f7f1f0d76dd6 157 }
XinZhangMS 0:f7f1f0d76dd6 158
XinZhangMS 0:f7f1f0d76dd6 159 static BUFFER_HANDLE base32_decode_impl(const char* source)
XinZhangMS 0:f7f1f0d76dd6 160 {
XinZhangMS 0:f7f1f0d76dd6 161 BUFFER_HANDLE result;
XinZhangMS 0:f7f1f0d76dd6 162
XinZhangMS 0:f7f1f0d76dd6 163 size_t src_length = strlen(source);
XinZhangMS 0:f7f1f0d76dd6 164 if (src_length % BASE32_INPUT_SIZE != 0)
XinZhangMS 0:f7f1f0d76dd6 165 {
XinZhangMS 0:f7f1f0d76dd6 166 /* Codes_SRS_BASE32_07_021: [ If the source length is not evenly divisible by 8, base32_decode_impl shall return NULL. ] */
XinZhangMS 0:f7f1f0d76dd6 167 LogError("Failure invalid input length %lu", src_length);
XinZhangMS 0:f7f1f0d76dd6 168 result = NULL;
XinZhangMS 0:f7f1f0d76dd6 169 }
XinZhangMS 0:f7f1f0d76dd6 170 else
XinZhangMS 0:f7f1f0d76dd6 171 {
XinZhangMS 0:f7f1f0d76dd6 172 size_t dest_size = 0;
XinZhangMS 0:f7f1f0d76dd6 173 unsigned char* temp_buffer;
XinZhangMS 0:f7f1f0d76dd6 174 unsigned char* dest_buff;
XinZhangMS 0:f7f1f0d76dd6 175 bool continue_processing = true;
XinZhangMS 0:f7f1f0d76dd6 176 unsigned char input[8];
XinZhangMS 0:f7f1f0d76dd6 177 const char* iterator = source;
XinZhangMS 0:f7f1f0d76dd6 178
XinZhangMS 0:f7f1f0d76dd6 179 /* Codes_SRS_BASE32_07_022: [ base32_decode_impl shall allocate a temp buffer to store the in process value. ] */
XinZhangMS 0:f7f1f0d76dd6 180 size_t allocation_len = base32_decoding_length(src_length);
XinZhangMS 0:f7f1f0d76dd6 181 if ((temp_buffer = (unsigned char*)malloc(allocation_len)) == NULL)
XinZhangMS 0:f7f1f0d76dd6 182 {
XinZhangMS 0:f7f1f0d76dd6 183 /* Codes_SRS_BASE32_07_023: [ If an error is encountered, base32_decode_impl shall return NULL. ] */
XinZhangMS 0:f7f1f0d76dd6 184 LogError("Failure allocating buffer");
XinZhangMS 0:f7f1f0d76dd6 185 result = NULL;
XinZhangMS 0:f7f1f0d76dd6 186 }
XinZhangMS 0:f7f1f0d76dd6 187 else
XinZhangMS 0:f7f1f0d76dd6 188 {
XinZhangMS 0:f7f1f0d76dd6 189 dest_buff = temp_buffer;
XinZhangMS 0:f7f1f0d76dd6 190 while (*iterator != '\0')
XinZhangMS 0:f7f1f0d76dd6 191 {
XinZhangMS 0:f7f1f0d76dd6 192 size_t index = 0;
XinZhangMS 0:f7f1f0d76dd6 193 /* Codes_SRS_BASE32_07_024: [ base32_decode_impl shall loop through and collect 8 characters from the source variable. ] */
XinZhangMS 0:f7f1f0d76dd6 194 for (index = 0; index < BASE32_INPUT_SIZE; index++)
XinZhangMS 0:f7f1f0d76dd6 195 {
XinZhangMS 0:f7f1f0d76dd6 196 input[index] = *iterator;
XinZhangMS 0:f7f1f0d76dd6 197 iterator++;
XinZhangMS 0:f7f1f0d76dd6 198 if (input[index] >= ASCII_VALUE_MAX)
XinZhangMS 0:f7f1f0d76dd6 199 {
XinZhangMS 0:f7f1f0d76dd6 200 LogError("Failure source encoding");
XinZhangMS 0:f7f1f0d76dd6 201 continue_processing = false;
XinZhangMS 0:f7f1f0d76dd6 202 break;
XinZhangMS 0:f7f1f0d76dd6 203 }
XinZhangMS 0:f7f1f0d76dd6 204
XinZhangMS 0:f7f1f0d76dd6 205 input[index] = convert_value_to_base32_char(input[index]);
XinZhangMS 0:f7f1f0d76dd6 206 }
XinZhangMS 0:f7f1f0d76dd6 207
XinZhangMS 0:f7f1f0d76dd6 208 if (!continue_processing)
XinZhangMS 0:f7f1f0d76dd6 209 {
XinZhangMS 0:f7f1f0d76dd6 210 result = NULL;
XinZhangMS 0:f7f1f0d76dd6 211 break;
XinZhangMS 0:f7f1f0d76dd6 212 }
XinZhangMS 0:f7f1f0d76dd6 213 else if ((dest_size + TARGET_BLOCK_SIZE) > allocation_len)
XinZhangMS 0:f7f1f0d76dd6 214 {
XinZhangMS 0:f7f1f0d76dd6 215 LogError("Failure target length exceeded");
XinZhangMS 0:f7f1f0d76dd6 216 result = NULL;
XinZhangMS 0:f7f1f0d76dd6 217 continue_processing = false;
XinZhangMS 0:f7f1f0d76dd6 218 break;
XinZhangMS 0:f7f1f0d76dd6 219 }
XinZhangMS 0:f7f1f0d76dd6 220 else
XinZhangMS 0:f7f1f0d76dd6 221 {
XinZhangMS 0:f7f1f0d76dd6 222 // Codes_SRS_BASE32_07_025: [ base32_decode_impl shall group 5 bytes at a time into the temp buffer. ]
XinZhangMS 0:f7f1f0d76dd6 223 *dest_buff++ = ((input[0] & 0x1f) << 3) | ((input[1] & 0x1c) >> 2);
XinZhangMS 0:f7f1f0d76dd6 224 *dest_buff++ = ((input[1] & 0x03) << 6) | ((input[2] & 0x1f) << 1) | ((input[3] & 0x10) >> 4);
XinZhangMS 0:f7f1f0d76dd6 225 *dest_buff++ = ((input[3] & 0x0f) << 4) | ((input[4] & 0x1e) >> 1);
XinZhangMS 0:f7f1f0d76dd6 226 *dest_buff++ = ((input[4] & 0x01) << 7) | ((input[5] & 0x1f) << 2) | ((input[6] & 0x18) >> 3);
XinZhangMS 0:f7f1f0d76dd6 227 *dest_buff++ = ((input[6] & 0x07) << 5) | (input[7] & 0x1f);
XinZhangMS 0:f7f1f0d76dd6 228 dest_size += TARGET_BLOCK_SIZE;
XinZhangMS 0:f7f1f0d76dd6 229 // If there is padding remove it
XinZhangMS 0:f7f1f0d76dd6 230 // Because we are packing 5 bytes into an 8 byte variable we need to check every other
XinZhangMS 0:f7f1f0d76dd6 231 // variable for padding
XinZhangMS 0:f7f1f0d76dd6 232 if (input[7] == BASE32_EQUAL_SIGN)
XinZhangMS 0:f7f1f0d76dd6 233 {
XinZhangMS 0:f7f1f0d76dd6 234 --dest_size;
XinZhangMS 0:f7f1f0d76dd6 235 if (input[5] == BASE32_EQUAL_SIGN)
XinZhangMS 0:f7f1f0d76dd6 236 {
XinZhangMS 0:f7f1f0d76dd6 237 --dest_size;
XinZhangMS 0:f7f1f0d76dd6 238 if (input[4] == BASE32_EQUAL_SIGN)
XinZhangMS 0:f7f1f0d76dd6 239 {
XinZhangMS 0:f7f1f0d76dd6 240 --dest_size;
XinZhangMS 0:f7f1f0d76dd6 241 if (input[2] == BASE32_EQUAL_SIGN)
XinZhangMS 0:f7f1f0d76dd6 242 {
XinZhangMS 0:f7f1f0d76dd6 243 --dest_size;
XinZhangMS 0:f7f1f0d76dd6 244 }
XinZhangMS 0:f7f1f0d76dd6 245 }
XinZhangMS 0:f7f1f0d76dd6 246 }
XinZhangMS 0:f7f1f0d76dd6 247 }
XinZhangMS 0:f7f1f0d76dd6 248 }
XinZhangMS 0:f7f1f0d76dd6 249 }
XinZhangMS 0:f7f1f0d76dd6 250
XinZhangMS 0:f7f1f0d76dd6 251 if (!continue_processing)
XinZhangMS 0:f7f1f0d76dd6 252 {
XinZhangMS 0:f7f1f0d76dd6 253 result = NULL;
XinZhangMS 0:f7f1f0d76dd6 254 }
XinZhangMS 0:f7f1f0d76dd6 255 else
XinZhangMS 0:f7f1f0d76dd6 256 {
XinZhangMS 0:f7f1f0d76dd6 257 /* Codes_SRS_BASE32_07_026: [ Once base32_decode_impl is complete it shall create a BUFFER with the temp buffer. ] */
XinZhangMS 0:f7f1f0d76dd6 258 result = BUFFER_create(temp_buffer, dest_size);
XinZhangMS 0:f7f1f0d76dd6 259 if (result == NULL)
XinZhangMS 0:f7f1f0d76dd6 260 {
XinZhangMS 0:f7f1f0d76dd6 261 LogError("Failure: BUFFER_create failed to create decoded buffer");
XinZhangMS 0:f7f1f0d76dd6 262 }
XinZhangMS 0:f7f1f0d76dd6 263 }
XinZhangMS 0:f7f1f0d76dd6 264 free(temp_buffer);
XinZhangMS 0:f7f1f0d76dd6 265 }
XinZhangMS 0:f7f1f0d76dd6 266 }
XinZhangMS 0:f7f1f0d76dd6 267 return result;
XinZhangMS 0:f7f1f0d76dd6 268 }
XinZhangMS 0:f7f1f0d76dd6 269
XinZhangMS 0:f7f1f0d76dd6 270 BUFFER_HANDLE Base32_Decode(STRING_HANDLE handle)
XinZhangMS 0:f7f1f0d76dd6 271 {
XinZhangMS 0:f7f1f0d76dd6 272 BUFFER_HANDLE result;
XinZhangMS 0:f7f1f0d76dd6 273 if (handle == NULL)
XinZhangMS 0:f7f1f0d76dd6 274 {
XinZhangMS 0:f7f1f0d76dd6 275 /* Codes_SRS_BASE32_07_016: [ If source is NULL Base32_Decoder shall return NULL. ] */
XinZhangMS 0:f7f1f0d76dd6 276 LogError("invalid parameter handle");
XinZhangMS 0:f7f1f0d76dd6 277 result = NULL;
XinZhangMS 0:f7f1f0d76dd6 278 }
XinZhangMS 0:f7f1f0d76dd6 279 else
XinZhangMS 0:f7f1f0d76dd6 280 {
XinZhangMS 0:f7f1f0d76dd6 281 const char* str_source = STRING_c_str(handle);
XinZhangMS 0:f7f1f0d76dd6 282 if (str_source == NULL)
XinZhangMS 0:f7f1f0d76dd6 283 {
XinZhangMS 0:f7f1f0d76dd6 284 /* Codes_SRS_BASE32_07_027: [ If the string in source value is NULL, Base32_Decoder shall return NULL. ] */
XinZhangMS 0:f7f1f0d76dd6 285 LogError("NULL value specified in string");
XinZhangMS 0:f7f1f0d76dd6 286 result = NULL;
XinZhangMS 0:f7f1f0d76dd6 287 }
XinZhangMS 0:f7f1f0d76dd6 288 else
XinZhangMS 0:f7f1f0d76dd6 289 {
XinZhangMS 0:f7f1f0d76dd6 290 /* Codes_SRS_BASE32_07_018: [ Base32_Decoder shall call base32_decode_impl to decode the base64 value. ] */
XinZhangMS 0:f7f1f0d76dd6 291 result = base32_decode_impl(str_source);
XinZhangMS 0:f7f1f0d76dd6 292 }
XinZhangMS 0:f7f1f0d76dd6 293 }
XinZhangMS 0:f7f1f0d76dd6 294 /* Codes_SRS_BASE32_07_017: [ On success Base32_Decoder shall return a BUFFER_HANDLE that contains the decoded bytes for source. ] */
XinZhangMS 0:f7f1f0d76dd6 295 return result;
XinZhangMS 0:f7f1f0d76dd6 296 }
XinZhangMS 0:f7f1f0d76dd6 297
XinZhangMS 0:f7f1f0d76dd6 298 BUFFER_HANDLE Base32_Decode_String(const char* source)
XinZhangMS 0:f7f1f0d76dd6 299 {
XinZhangMS 0:f7f1f0d76dd6 300 BUFFER_HANDLE result;
XinZhangMS 0:f7f1f0d76dd6 301 if (source == NULL)
XinZhangMS 0:f7f1f0d76dd6 302 {
XinZhangMS 0:f7f1f0d76dd6 303 /* Codes_SRS_BASE32_07_008: [ If source is NULL Base32_Decoder_String shall return NULL. ] */
XinZhangMS 0:f7f1f0d76dd6 304 LogError("invalid parameter source=NULL");
XinZhangMS 0:f7f1f0d76dd6 305 result = NULL;
XinZhangMS 0:f7f1f0d76dd6 306 }
XinZhangMS 0:f7f1f0d76dd6 307 else
XinZhangMS 0:f7f1f0d76dd6 308 {
XinZhangMS 0:f7f1f0d76dd6 309 /* Codes_SRS_BASE32_07_020: [ Base32_Decoder_String shall call base32_decode_impl to decode the base64 value. ] */
XinZhangMS 0:f7f1f0d76dd6 310 result = base32_decode_impl(source);
XinZhangMS 0:f7f1f0d76dd6 311 }
XinZhangMS 0:f7f1f0d76dd6 312 /* Codes_SRS_BASE32_07_019: [ On success Base32_Decoder_String shall return a BUFFER_HANDLE that contains the decoded bytes for source. ] */
XinZhangMS 0:f7f1f0d76dd6 313 return result;
XinZhangMS 0:f7f1f0d76dd6 314 }
XinZhangMS 0:f7f1f0d76dd6 315
XinZhangMS 0:f7f1f0d76dd6 316 char* Base32_Encode_Bytes(const unsigned char* source, size_t size)
XinZhangMS 0:f7f1f0d76dd6 317 {
XinZhangMS 0:f7f1f0d76dd6 318 char* result;
XinZhangMS 0:f7f1f0d76dd6 319 if (source == NULL)
XinZhangMS 0:f7f1f0d76dd6 320 {
XinZhangMS 0:f7f1f0d76dd6 321 /* Codes_SRS_BASE32_07_004: [ If source is NULL Base32_Encode shall return NULL. ] */
XinZhangMS 0:f7f1f0d76dd6 322 result = NULL;
XinZhangMS 0:f7f1f0d76dd6 323 LogError("Failure: Invalid input parameter source");
XinZhangMS 0:f7f1f0d76dd6 324 }
XinZhangMS 0:f7f1f0d76dd6 325 else if (size == 0)
XinZhangMS 0:f7f1f0d76dd6 326 {
XinZhangMS 0:f7f1f0d76dd6 327 /* Codes_SRS_BASE32_07_005: [ If size is 0 Base32_Encode shall return an empty string. ] */
XinZhangMS 0:f7f1f0d76dd6 328 result = malloc(1);
XinZhangMS 0:f7f1f0d76dd6 329 strcpy(result, "");
XinZhangMS 0:f7f1f0d76dd6 330 }
XinZhangMS 0:f7f1f0d76dd6 331 else
XinZhangMS 0:f7f1f0d76dd6 332 {
XinZhangMS 0:f7f1f0d76dd6 333 /* Codes_SRS_BASE32_07_007: [ Base32_Encode_Bytes shall call into base32_Encode_impl to encode the source data. ] */
XinZhangMS 0:f7f1f0d76dd6 334 result = base32_encode_impl(source, size);
XinZhangMS 0:f7f1f0d76dd6 335 if (result == NULL)
XinZhangMS 0:f7f1f0d76dd6 336 {
XinZhangMS 0:f7f1f0d76dd6 337 /* Codes_SRS_BASE32_07_014: [ Upon failure Base32_Encode_Bytes shall return NULL. ] */
XinZhangMS 0:f7f1f0d76dd6 338 LogError("encoding of unsigned char failed.");
XinZhangMS 0:f7f1f0d76dd6 339 }
XinZhangMS 0:f7f1f0d76dd6 340 }
XinZhangMS 0:f7f1f0d76dd6 341 /* Codes_SRS_BASE32_07_006: [ If successful Base32_Encode shall return the base32 value of input. ] */
XinZhangMS 0:f7f1f0d76dd6 342 return result;
XinZhangMS 0:f7f1f0d76dd6 343 }
XinZhangMS 0:f7f1f0d76dd6 344
XinZhangMS 0:f7f1f0d76dd6 345 STRING_HANDLE Base32_Encode(BUFFER_HANDLE source)
XinZhangMS 0:f7f1f0d76dd6 346 {
XinZhangMS 0:f7f1f0d76dd6 347 STRING_HANDLE result;
XinZhangMS 0:f7f1f0d76dd6 348 if (source == NULL)
XinZhangMS 0:f7f1f0d76dd6 349 {
XinZhangMS 0:f7f1f0d76dd6 350 /* Codes_SRS_BASE32_07_001: [ If source is NULL Base32_Encode shall return NULL. ] */
XinZhangMS 0:f7f1f0d76dd6 351 result = NULL;
XinZhangMS 0:f7f1f0d76dd6 352 LogError("Failure: Invalid input parameter");
XinZhangMS 0:f7f1f0d76dd6 353 }
XinZhangMS 0:f7f1f0d76dd6 354 else
XinZhangMS 0:f7f1f0d76dd6 355 {
XinZhangMS 0:f7f1f0d76dd6 356 size_t input_len = BUFFER_length(source);
XinZhangMS 0:f7f1f0d76dd6 357 const unsigned char* input_value = BUFFER_u_char(source);
XinZhangMS 0:f7f1f0d76dd6 358 if (input_value == NULL || input_len == 0)
XinZhangMS 0:f7f1f0d76dd6 359 {
XinZhangMS 0:f7f1f0d76dd6 360 /* Codes_SRS_BASE32_07_015: [ If size is 0 Base32_Encode shall return an empty string. ] */
XinZhangMS 0:f7f1f0d76dd6 361 result = STRING_new();
XinZhangMS 0:f7f1f0d76dd6 362 if (result == NULL)
XinZhangMS 0:f7f1f0d76dd6 363 {
XinZhangMS 0:f7f1f0d76dd6 364 LogError("Failure constructing new string.");
XinZhangMS 0:f7f1f0d76dd6 365 }
XinZhangMS 0:f7f1f0d76dd6 366 }
XinZhangMS 0:f7f1f0d76dd6 367 else
XinZhangMS 0:f7f1f0d76dd6 368 {
XinZhangMS 0:f7f1f0d76dd6 369 /* Codes_SRS_BASE32_07_003: [ Base32_Encode shall call into base32_Encode_impl to encode the source data. ] */
XinZhangMS 0:f7f1f0d76dd6 370 char* encoded = base32_encode_impl(input_value, input_len);
XinZhangMS 0:f7f1f0d76dd6 371 if (encoded == NULL)
XinZhangMS 0:f7f1f0d76dd6 372 {
XinZhangMS 0:f7f1f0d76dd6 373 /* Codes_SRS_BASE32_07_014: [ Upon failure base32_Encode shall return NULL. ] */
XinZhangMS 0:f7f1f0d76dd6 374 LogError("base32 encode implementation failed.");
XinZhangMS 0:f7f1f0d76dd6 375 result = NULL;
XinZhangMS 0:f7f1f0d76dd6 376 }
XinZhangMS 0:f7f1f0d76dd6 377 else
XinZhangMS 0:f7f1f0d76dd6 378 {
XinZhangMS 0:f7f1f0d76dd6 379 /* Codes_SRS_BASE32_07_012: [ base32_Encode shall wrap the base32_Encode_impl result into a STRING_HANDLE. ] */
XinZhangMS 0:f7f1f0d76dd6 380 result = STRING_construct(encoded);
XinZhangMS 0:f7f1f0d76dd6 381 if (result == NULL)
XinZhangMS 0:f7f1f0d76dd6 382 {
XinZhangMS 0:f7f1f0d76dd6 383 /* Codes_SRS_BASE32_07_014: [ Upon failure base32_Encode shall return NULL. ] */
XinZhangMS 0:f7f1f0d76dd6 384 LogError("string construction failed.");
XinZhangMS 0:f7f1f0d76dd6 385 }
XinZhangMS 0:f7f1f0d76dd6 386 free(encoded);
XinZhangMS 0:f7f1f0d76dd6 387 }
XinZhangMS 0:f7f1f0d76dd6 388 }
XinZhangMS 0:f7f1f0d76dd6 389 }
XinZhangMS 0:f7f1f0d76dd6 390 /* Codes_SRS_BASE32_07_002: [ If successful Base32_Encode shall return the base32 value of source. ] */
XinZhangMS 0:f7f1f0d76dd6 391 return result;
XinZhangMS 0:f7f1f0d76dd6 392 }