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utils.cpp
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268 lines (246 loc) · 10.1 KB
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#include "utils.h"
static const unsigned int crc32_table[] =
{
0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4};
uint32_t Utils::crc32(uint8_t value, uint32_t init)
{
return (init << 8) ^ crc32_table[((init >> 24) ^ value) & 255];
}
uint32_t Utils::crc32(int32_t value, uint32_t init)
{
auto crc = init;
crc = Utils::crc32((uint8_t)((value >> 0) & 0xff), crc);
crc = Utils::crc32((uint8_t)((value >> 8) & 0xff), crc);
crc = Utils::crc32((uint8_t)((value >> 16) & 0xff), crc);
crc = Utils::crc32((uint8_t)((value >> 24) & 0xff), crc);
return crc;
}
uint32_t Utils::crc32(uint32_t value, uint32_t init)
{
auto crc = init;
crc = Utils::crc32((uint8_t)((value >> 0) & 0xff), crc);
crc = Utils::crc32((uint8_t)((value >> 8) & 0xff), crc);
crc = Utils::crc32((uint8_t)((value >> 16) & 0xff), crc);
crc = Utils::crc32((uint8_t)((value >> 24) & 0xff), crc);
return crc;
}
uint32_t Utils::crc32(const uint8_t *buf, uint32_t len, uint32_t init)
{
uint32_t crc = init;
while (len--)
{
crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *buf) & 255];
buf++;
}
return crc;
}
char encoding_table[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3',
'4', '5', '6', '7', '8', '9', '+', '/'};
uint8_t decoding_table[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, 0, 0, 0, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, 0, 0, 0, 0,
0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0,
0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
int mod_table[] = {0, 2, 1};
bool Utils::tryBase64Encode(const uint8_t *input,
uint32_t inputLength,
uint8_t *output,
uint32_t outputSize,
uint32_t *outputLength)
{
*outputLength = 4 * ((inputLength + 2) / 3);
// Check for sufficient output space
if (*outputLength > outputSize)
return false;
for (uint32_t i = 0, j = 0; i < inputLength;)
{
uint32_t octet_a = i < inputLength ? (unsigned char)input[i++] : 0;
uint32_t octet_b = i < inputLength ? (unsigned char)input[i++] : 0;
uint32_t octet_c = i < inputLength ? (unsigned char)input[i++] : 0;
uint32_t triple = (octet_a << 0x10) + (octet_b << 0x08) + octet_c;
output[j++] = encoding_table[(triple >> 3 * 6) & 0x3F];
output[j++] = encoding_table[(triple >> 2 * 6) & 0x3F];
output[j++] = encoding_table[(triple >> 1 * 6) & 0x3F];
output[j++] = encoding_table[(triple >> 0 * 6) & 0x3F];
}
for (int i = 0; i < mod_table[inputLength % 3]; i++)
output[*outputLength - 1 - i] = '=';
return true;
}
bool Utils::tryBase64Decode(const char *input,
uint32_t inputLength,
uint8_t *output,
uint32_t outputSize,
uint32_t *outputLength)
{
if (inputLength % 4 != 0)
return false;
*outputLength = inputLength / 4 * 3;
if (input[inputLength - 1] == '=')
(*outputLength)--;
if (input[inputLength - 2] == '=')
(*outputLength)--;
// Check for sufficient output space
if (*outputLength > outputSize)
return false;
for (uint32_t i = 0, j = 0; i < inputLength;)
{
uint32_t sextet_a = input[i] == '=' ? 0 & i++ : decoding_table[((uint8_t*)input)[i++]];
uint32_t sextet_b = input[i] == '=' ? 0 & i++ : decoding_table[((uint8_t*)input)[i++]];
uint32_t sextet_c = input[i] == '=' ? 0 & i++ : decoding_table[((uint8_t*)input)[i++]];
uint32_t sextet_d = input[i] == '=' ? 0 & i++ : decoding_table[((uint8_t*)input)[i++]];
uint32_t triple = (sextet_a << 3 * 6) +
(sextet_b << 2 * 6) +
(sextet_c << 1 * 6) +
(sextet_d << 0 * 6);
if (j < *outputLength)
output[j++] = (triple >> 2 * 8) & 0xFF;
if (j < *outputLength)
output[j++] = (triple >> 1 * 8) & 0xFF;
if (j < *outputLength)
output[j++] = (triple >> 0 * 8) & 0xFF;
}
return true;
}
void Utils::strprint(char **dst, uint32_t &size, uint32_t value, uint32_t base)
{
char *dst_local = *dst;
while (size > 1)
{
auto module = value % base;
if (module < 10)
*dst_local++ = '0' + module;
else
*dst_local++ = 'A' + (module - 10);
value = value / base;
size--;
// Do not check as part of while clause so we enter here at least once, handling the case
// where value is zero from the beginning
if (value == 0)
break;
}
*dst_local = '\0';
*dst = dst_local;
}
void Utils::strprint(char **dst, uint32_t &size, const char *src)
{
char *dst_local = *dst;
while (size > 1 && *src != 0)
{
*dst_local++ = *src++;
size--;
}
*dst_local = '\0';
*dst = dst_local;
}
bool Utils::strTryParse(const char *src, uint32_t size, uint32_t &value, uint32_t base)
{
value = 0;
// Parse a UInt32 from <size> characters in <src>
// TODO verify min-max values
while (size > 0)
{
auto currChar = *src;
uint32_t valueToSum;
if (currChar >= '0' && currChar <= '9')
{
valueToSum = currChar - '0';
}
else if (currChar >= 'A' && currChar <= 'Z')
{
valueToSum = currChar - 'A' + 10;
}
else if (currChar >= 'a' && currChar <= 'z')
{
valueToSum = currChar - 'a' + 10;
}
else
{
return false;
}
value = value * base + valueToSum;
src += 1;
size--;
}
return true;
}