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yaml-cpp

src

binary.cpp

binary.cpp 3.41 KB

#include "yaml-cpp/binary.h"

#include <cctype>

namespace YAML {
static const char encoding[] =
 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

std::string EncodeBase64(const unsigned char *data, std::size_t size) {
 const char PAD = '=';

std::string ret;
 ret.resize(4 * size / 3 + 3);
 char *out = &ret[0];

std::size_t chunks = size / 3;
 std::size_t remainder = size % 3;

for (std::size_t i = 0; i < chunks; i++, data += 3) {
 *out++ = encoding[data[0] >> 2];
 *out++ = encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
 *out++ = encoding[((data[1] & 0xf) << 2) | (data[2] >> 6)];
 *out++ = encoding[data[2] & 0x3f];
 }

switch (remainder) {
 case 0:
 break;
 case 1:
 *out++ = encoding[data[0] >> 2];
 *out++ = encoding[((data[0] & 0x3) << 4)];
 *out++ = PAD;
 *out++ = PAD;
 break;
 case 2:
 *out++ = encoding[data[0] >> 2];
 *out++ = encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
 *out++ = encoding[((data[1] & 0xf) << 2)];
 *out++ = PAD;
 break;
 }

ret.resize(out - &ret[0]);
 return ret;
}

static const unsigned char decoding[] = {
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255,
 255, 255, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
 255, 0, 255, 255, 255, 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, 255, 255, 255, 255, 255, 255, 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, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255,
};

std::vector<unsigned char> DecodeBase64(const std::string &input) {
 using ret_type = std::vector<unsigned char>;
 if (input.empty())
 return ret_type();

ret_type ret(3 * input.size() / 4 + 1);
 unsigned char *out = &ret[0];

unsigned value = 0;
 std::size_t cnt = 0;
 for (std::size_t i = 0; i < input.size(); i++) {
 if (std::isspace(static_cast<unsigned char>(input[i]))) {
 // skip newlines
 continue;
 }
 unsigned char d = decoding[static_cast<unsigned char>(input[i])];
 if (d == 255)
 return ret_type();

value = (value << 6) | d;
 if (cnt == 3) {
 *out++ = value >> 16;
 if (i > 0 && input[i - 1] != '=')
 *out++ = value >> 8;
 if (input[i] != '=')
 *out++ = value;
 cnt = 0;
 } else {
 ++cnt;
 }
 }
 if (cnt != 0) {
 // An invalid number of characters were encountered.
 return ret_type();
 }

ret.resize(out - &ret[0]);
 return ret;
}
} // namespace YAML

一键复制编辑原始数据按行查看历史

Jeremy Nimmer 提交于 2026年02月10日 23:01 +08:00 . Fix DecodeBase64 to reject truncated input

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 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 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107

#include "yaml-cpp/binary.h"

#include <cctype>

namespace YAML {
static const char encoding[] =
 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

std::string EncodeBase64(const unsigned char *data, std::size_t size) {
 const char PAD = '=';

 std::string ret;
 ret.resize(4 * size / 3 + 3);
 char *out = &ret[0];

 std::size_t chunks = size / 3;
 std::size_t remainder = size % 3;

 for (std::size_t i = 0; i < chunks; i++, data += 3) {
 *out++ = encoding[data[0] >> 2];
 *out++ = encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
 *out++ = encoding[((data[1] & 0xf) << 2) | (data[2] >> 6)];
 *out++ = encoding[data[2] & 0x3f];
 }

 switch (remainder) {
 case 0:
 break;
 case 1:
 *out++ = encoding[data[0] >> 2];
 *out++ = encoding[((data[0] & 0x3) << 4)];
 *out++ = PAD;
 *out++ = PAD;
 break;
 case 2:
 *out++ = encoding[data[0] >> 2];
 *out++ = encoding[((data[0] & 0x3) << 4) | (data[1] >> 4)];
 *out++ = encoding[((data[1] & 0xf) << 2)];
 *out++ = PAD;
 break;
 }

 ret.resize(out - &ret[0]);
 return ret;
}

static const unsigned char decoding[] = {
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 62, 255,
 255, 255, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 255, 255,
 255, 0, 255, 255, 255, 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, 255, 255, 255, 255, 255, 255, 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, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255,
};

std::vector<unsigned char> DecodeBase64(const std::string &input) {
 using ret_type = std::vector<unsigned char>;
 if (input.empty())
 return ret_type();

 ret_type ret(3 * input.size() / 4 + 1);
 unsigned char *out = &ret[0];

 unsigned value = 0;
 std::size_t cnt = 0;
 for (std::size_t i = 0; i < input.size(); i++) {
 if (std::isspace(static_cast<unsigned char>(input[i]))) {
 // skip newlines
 continue;
 }
 unsigned char d = decoding[static_cast<unsigned char>(input[i])];
 if (d == 255)
 return ret_type();

 value = (value << 6) | d;
 if (cnt == 3) {
 *out++ = value >> 16;
 if (i > 0 && input[i - 1] != '=')
 *out++ = value >> 8;
 if (input[i] != '=')
 *out++ = value;
 cnt = 0;
 } else {
 ++cnt;
 }
 }
 if (cnt != 0) {
 // An invalid number of characters were encountered.
 return ret_type();
 }

 ret.resize(out - &ret[0]);
 return ret;
}
} // namespace YAML