[4] | 1 | /**
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| 2 | * @file codec.cpp
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| 3 | * @author myusgun@gmail.com
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| 4 | * @brief codec
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| 5 | */
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| 6 | #include "cf/codec.h"
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| 7 | #include "cf/memory.h"
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| 8 |
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| 9 | #define BASE64_PADDING_CHAR_INDEX 64
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| 10 |
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| 11 | cf::codec::base64 * cf::codec::base64::getInstance()
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| 12 | {
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| 13 | static cf::codec::base64 instance;
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| 14 |
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| 15 | return &instance;
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| 16 | }
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| 17 |
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| 18 | std::string cf::codec::base64::encode(const cf::bin & in) const
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| 19 | throw (cf::exception)
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| 20 | {
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| 21 | if (in.empty())
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| 22 | THROW_EXCEPTION("input is empty");
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| 23 | try
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| 24 | {
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| 25 | cf::size_t inlen = in.size();
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| 26 | cf::char_t * buf = NULL;
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| 27 | cf::size_t memsize = (((inlen + 2) / 3) * 4) + 1;
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| 28 | cf::memory mem(memsize);
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| 29 |
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| 30 | buf = reinterpret_cast<cf::char_t *>(mem.buffer());
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| 31 |
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| 32 | /*--------------------------------------------------------------*/
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| 33 | cf::char_t * dst = buf;
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| 34 | const cf::uint8_t * src = in.buffer();
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| 35 | const cf::uint8_t * ptr = src;
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| 36 |
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| 37 | const static cf::char_t base64enc[] = {
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| 38 | 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', /* 00 - 07 */
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| 39 | 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', /* 08 - 15 */
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| 40 | 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', /* 16 - 23 */
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| 41 | 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', /* 24 - 31 */
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| 42 | 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', /* 32 - 39 */
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| 43 | 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', /* 40 - 47 */
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| 44 | 'w', 'x', 'y', 'z', '0', '1', '2', '3', /* 48 - 55 */
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| 45 | '4', '5', '6', '7', '8', '9', '+', '/', /* 56 - 63 */
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| 46 | '=' /* padding */
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| 47 | };
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| 48 |
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| 49 | #define SEXTUPLE_E_1(__x) (((__x[0]) >> 2) & 0x3f)
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| 50 | #define SEXTUPLE_E_2(__x) (((__x[0]) << 4) & 0x30)
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| 51 | #define SEXTUPLE_E_3(__x) (((__x[1]) >> 4) & 0x0f)
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| 52 | #define SEXTUPLE_E_4(__x) (((__x[1]) << 2) & 0x3c)
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| 53 | #define SEXTUPLE_E_5(__x) (((__x[2]) >> 6) & 0x03)
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| 54 | #define SEXTUPLE_E_6(__x) (((__x[2]) ) & 0x3f)
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| 55 |
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| 56 | for ( ; static_cast<cf::size_t>(ptr - src) < (inlen - 2) ; ptr += 3)
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| 57 | {
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| 58 | *dst++ = base64enc[SEXTUPLE_E_1 (ptr)];
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| 59 | *dst++ = base64enc[SEXTUPLE_E_2 (ptr) | SEXTUPLE_E_3 (ptr)];
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| 60 | *dst++ = base64enc[SEXTUPLE_E_4 (ptr) | SEXTUPLE_E_5 (ptr)];
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| 61 | *dst++ = base64enc[SEXTUPLE_E_6 (ptr)];
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| 62 | }
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| 63 |
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| 64 | if (static_cast<cf::size_t>(ptr - src) < inlen)
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| 65 | {
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| 66 | *dst++ = base64enc[SEXTUPLE_E_1 (ptr)];
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| 67 |
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| 68 | if (static_cast<cf::size_t>(ptr - src) == (inlen - 1))
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| 69 | {
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| 70 | *dst++ = base64enc[SEXTUPLE_E_2 (ptr)];
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| 71 | *dst++ = base64enc[BASE64_PADDING_CHAR_INDEX];
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| 72 | }
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| 73 | else
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| 74 | {
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| 75 | *dst++ = base64enc[SEXTUPLE_E_2 (ptr) | SEXTUPLE_E_3 (ptr)];
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| 76 | *dst++ = base64enc[SEXTUPLE_E_4 (ptr)];
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| 77 | }
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| 78 |
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| 79 | *dst++ = base64enc[BASE64_PADDING_CHAR_INDEX];
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| 80 | }
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| 81 | *dst = '\0';
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| 82 | /*--------------------------------------------------------------*/
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| 83 |
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| 84 | return std::string(buf);
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| 85 | }
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| 86 | catch (cf::exception &e)
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| 87 | {
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| 88 | FORWARD_EXCEPTION(e);
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| 89 | }
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| 90 | }
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| 91 |
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| 92 | cf::bin cf::codec::base64::decode(const std::string & in) const
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| 93 | throw (cf::exception)
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| 94 | {
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| 95 | if (in.empty())
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| 96 | THROW_EXCEPTION("base64 string is empty");
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| 97 |
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| 98 | try
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| 99 | {
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| 100 | cf::uint8_t * buf = NULL;
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| 101 | cf::long_t outlen = 0;
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| 102 | cf::size_t memsize = in.size() / 4 * 3;
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| 103 | cf::memory mem(memsize);
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| 104 |
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| 105 | buf = reinterpret_cast<cf::uint8_t *>(mem.buffer());
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| 106 |
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| 107 | /*--------------------------------------------------------------*/
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| 108 | const cf::char_t * src = in.c_str();
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| 109 | const cf::char_t * ptr = src;
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| 110 | cf::uint8_t * dst = buf;
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| 111 | cf::long_t remain = 0;
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| 112 | cf::long_t binlen = 0;
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| 113 |
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| 114 | const static cf::uint8_t base64dec[] = {
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| 115 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 00 - 07 */
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| 116 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 08 - 15 */
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| 117 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 16 - 23 */
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| 118 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 24 - 31 */
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| 119 | 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 32 - 39 */
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| 120 | 0xff,0xff,0xff, 62,0xff,0xff,0xff, 63, /* 40 - 47 */
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| 121 | 52, 53, 54, 55, 56, 57, 58, 59, /* 48 - 55 */
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| 122 | 60, 61,0xff,0xff,0xff, 64,0xff,0xff, /* 56 - 63 */
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| 123 | 0xff, 0, 1, 2, 3, 4, 5, 6, /* 64 - 71 */
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| 124 | 7, 8, 9, 10, 11, 12, 13, 14, /* 71 - 79 */
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| 125 | 15, 16, 17, 18, 19, 20, 21, 22, /* 80 - 87 */
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| 126 | 23, 24, 25,0xff,0xff,0xff,0xff,0xff, /* 88 - 95 */
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| 127 | 0xff, 26, 27, 28, 29, 30, 31, 32, /* 96 - 103 */
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| 128 | 33, 34, 35, 36, 37, 38, 39, 40, /* 104 - 111 */
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| 129 | 41, 42, 43, 44, 45, 46, 47, 48, /* 112 - 119 */
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| 130 | 49, 50, 51,0xff,0xff,0xff,0xff,0xff /* 120 - 127 */
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| 131 | };
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| 132 |
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| 133 | while (base64dec[(int)*ptr] < BASE64_PADDING_CHAR_INDEX) ptr++;
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| 134 |
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| 135 | if (*ptr == 0xff)
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| 136 | THROW_EXCEPTION("input string is not base64-encoded");
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| 137 |
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| 138 | remain = ptr - src;
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| 139 | binlen = ((remain + 2/* max padding length */) / 4) * 3;
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| 140 |
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| 141 | #define SEXTUPLE_D_1(src) (base64dec[(int)src[0]] << 2)
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| 142 | #define SEXTUPLE_D_2(src) (base64dec[(int)src[1]] >> 4)
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| 143 | #define SEXTUPLE_D_3(src) (base64dec[(int)src[1]] << 4)
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| 144 | #define SEXTUPLE_D_4(src) (base64dec[(int)src[2]] >> 2)
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| 145 | #define SEXTUPLE_D_5(src) (base64dec[(int)src[2]] << 6)
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| 146 | #define SEXTUPLE_D_6(src) (base64dec[(int)src[3]] )
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| 147 |
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| 148 | for (ptr = src ; remain > 4 ; remain -= 4, ptr += 4)
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| 149 | {
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| 150 | *dst++ = (cf::uint8_t)(SEXTUPLE_D_1(ptr) | SEXTUPLE_D_2(ptr));
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| 151 | *dst++ = (cf::uint8_t)(SEXTUPLE_D_3(ptr) | SEXTUPLE_D_4(ptr));
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| 152 | *dst++ = (cf::uint8_t)(SEXTUPLE_D_5(ptr) | SEXTUPLE_D_6(ptr));
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| 153 | }
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| 154 |
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| 155 | if (remain > 1)
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| 156 | *dst++ = (cf::uint8_t)(SEXTUPLE_D_1(ptr) | SEXTUPLE_D_2(ptr));
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| 157 | if (remain > 2)
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| 158 | *dst++ = (cf::uint8_t)(SEXTUPLE_D_3(ptr) | SEXTUPLE_D_4(ptr));
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| 159 | if (remain > 3)
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| 160 | *dst++ = (cf::uint8_t)(SEXTUPLE_D_5(ptr) | SEXTUPLE_D_6(ptr));
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| 161 |
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| 162 | outlen = binlen - (4 - remain);
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| 163 | /*--------------------------------------------------------------*/
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| 164 |
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| 165 | return cf::bin(buf, static_cast<cf::size_t>(outlen));
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| 166 | }
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| 167 | catch (cf::exception &e)
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| 168 | {
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| 169 | FORWARD_EXCEPTION(e);
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| 170 | }
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| 171 | }
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| 172 |
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| 173 | cf::codec::hex * cf::codec::hex::getInstance()
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| 174 | {
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| 175 | static cf::codec::hex instance;
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| 176 |
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| 177 | return &instance;
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| 178 | }
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| 179 |
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| 180 | std::string cf::codec::hex::encode(const cf::bin & in) const
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| 181 | throw (cf::exception)
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| 182 | {
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| 183 | if (in.empty())
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| 184 | THROW_EXCEPTION("input is empty");
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| 185 |
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| 186 | try
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| 187 | {
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| 188 | cf::char_t * buf = NULL;
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| 189 | cf::size_t memsize = in.size() * 2 + 1;
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| 190 | cf::memory mem(memsize);
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| 191 |
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| 192 | buf = reinterpret_cast<cf::char_t *>(mem.buffer());
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| 193 |
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| 194 | /*--------------------------------------------------------------*/
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| 195 | const cf::uint8_t * src = in.buffer();
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| 196 | cf::char_t * dst = buf;
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| 197 |
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| 198 | const static cf::char_t hexenc[] = {
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| 199 | '0', '1', '2', '3', '4', '5', '6', '7',
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| 200 | '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
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| 201 | };
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| 202 |
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| 203 | for ( ; static_cast<cf::size_t>(src - in.buffer()) < in.size() ; src++)
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| 204 | {
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| 205 | *dst++ = hexenc[((*src) >> 4) & 0x0f];
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| 206 | *dst++ = hexenc[((*src) ) & 0x0f];
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| 207 | }
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| 208 | *dst = '\0';
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| 209 | /*--------------------------------------------------------------*/
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| 210 |
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| 211 | return std::string(buf);
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| 212 | }
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| 213 | catch (cf::exception &e)
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| 214 | {
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| 215 | FORWARD_EXCEPTION(e);
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| 216 | }
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| 217 | }
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| 218 |
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| 219 | cf::bin cf::codec::hex::decode(const std::string & in) const
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| 220 | throw (cf::exception)
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| 221 | {
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| 222 | if (in.empty())
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| 223 | THROW_EXCEPTION("hex string is empty");
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| 224 |
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| 225 | try
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| 226 | {
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| 227 | cf::uint8_t * buf = NULL;
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| 228 | cf::int32_t len = 0;
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| 229 | cf::size_t memsize = in.size() / 2;
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| 230 | cf::memory mem(memsize);
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| 231 |
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| 232 | buf = reinterpret_cast<cf::uint8_t *>(mem.buffer());
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| 233 |
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| 234 | /*--------------------------------------------------------------*/
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| 235 | cf::int32_t length = 0; /* even-number */
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| 236 |
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| 237 | const cf::char_t * src = in.c_str();
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| 238 | const cf::char_t * ptr = src;
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| 239 | cf::uint8_t * dst = buf;
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| 240 | cf::uint8_t val = 0;
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| 241 | cf::uint8_t sum = 0;
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| 242 | cf::uint8_t asciiHex = 0;
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| 243 |
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| 244 | const static cf::uint8_t hexdec[] = {
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| 245 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 00 - 07 */
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| 246 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 08 - 15 */
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| 247 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16 - 23 */
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| 248 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24 - 31 */
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| 249 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 32 - 39 */
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| 250 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 40 - 47 */
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| 251 | '0', '0', '0', '0', '0', '0', '0', '0', /* 48 - 55 */
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| 252 | '0', '0',0x00,0x00,0x00,0x00,0x00,0x00, /* 56 - 63 */
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| 253 | 0x00, 'A', 'A', 'A', 'A', 'A', 'A',0x00, /* 64 - 71 */
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| 254 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 71 - 79 */
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| 255 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 80 - 87 */
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| 256 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 88 - 95 */
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| 257 | 0x00, 'a', 'a', 'a', 'a', 'a', 'a',0x00, /* 96 - 103 */
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| 258 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 104 - 111 */
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| 259 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112 - 119 */
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| 260 | 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 /* 120 - 127 */
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| 261 | };
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| 262 |
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| 263 | for ( ; hexdec[(int)*ptr] && *ptr ; ptr++, length++);
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| 264 |
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| 265 | if (*ptr)
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| 266 | THROW_EXCEPTION("input string is not hex-encoded");
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| 267 |
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| 268 | for (ptr = src ; *ptr ; )
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| 269 | {
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| 270 | sum = 0; /* init/re-init decoding-buffer */
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| 271 |
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| 272 | /* decode one character */
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| 273 | #define DECODE_HEX(x) \
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| 274 | do { \
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| 275 | val = static_cast<cf::uint8_t>(*(x)); \
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| 276 | sum = (cf::uint8_t)(sum << 4); \
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| 277 | asciiHex = hexdec[val]; \
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| 278 | \
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| 279 | sum |= (cf::uint8_t) \
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| 280 | (val - asciiHex + (asciiHex == '0' ? 0 : 10)); \
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| 281 | } while (0)
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| 282 |
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| 283 | /* decode one byte by decode two character */
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| 284 | DECODE_HEX(ptr++);
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| 285 | DECODE_HEX(ptr++);
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| 286 |
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| 287 | *dst++ = sum;
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| 288 | }
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| 289 | len = length / 2;
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| 290 | /*--------------------------------------------------------------*/
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| 291 |
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| 292 | return cf::bin(buf, len);
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| 293 | }
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| 294 | catch (cf::exception &e)
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| 295 | {
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| 296 | FORWARD_EXCEPTION(e);
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| 297 | }
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| 298 | }
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