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#include |
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namespace panda { namespace encode { |
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static const int XX = 255; /* illegal char */ |
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#define REV32(x) index32[(int)(x)] |
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static const char basis32[] = "abcdefghijklmnopqrstuvwxyz234567"; |
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static const char basis32up[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"; |
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static const unsigned char index32[256] = { |
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XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
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XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
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XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
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XX,XX,26,27, 28,29,30,31, XX,XX,XX,XX, XX,XX,XX,XX, |
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XX, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, |
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15,16,17,18, 19,20,21,22, 23,24,25,XX, XX,XX,XX,XX, |
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XX, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, |
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15,16,17,18, 19,20,21,22, 23,24,25,XX, XX,XX,XX,XX, |
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XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
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XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
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XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
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XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
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XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
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XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
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XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, |
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XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX, XX,XX,XX,XX |
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}; |
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size_t encode_base32 (const string_view source, char* dest, bool upper) { |
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100
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const char* const basis = upper ? basis32up : basis32; |
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const unsigned char* str = (unsigned char*)source.data(); |
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const unsigned char* const end = str + source.length(); |
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2
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char* ptr = dest; |
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102
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while (1) { |
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104
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if (str == end) break; |
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*ptr++ = basis[(*str & 0xf8) >> 3]; |
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104
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if (str == end) { |
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0
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ptr--; /* previous char is useless */ |
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0
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break; |
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} |
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104
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100
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*ptr++ = basis[((*str & 0x07) << 2) | ((str + 1 != end) ? ((*(str+1) & 0xc0) >> 6) : 0)]; |
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104
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str++; /* 0 complete, iin=1 */ |
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104
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100
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if (str == end) break; |
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102
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*ptr++ = basis[(*str & 0x3e) >> 1]; |
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50
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102
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if (str == end) { |
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0
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ptr--; /* previous char is useless */ |
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0
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break; |
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} |
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102
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*ptr++ = basis[((*str & 0x01) << 4) | ((str + 1 != end) ? ((*(str+1) & 0xf0) >> 4) : 0)]; |
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102
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str++; /* 1 complete, iin=2 */ |
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57
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102
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50
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if (str == end) break; |
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102
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*ptr++ = basis[((*str & 0x0f) << 1) | ((str + 1 != end) ? ((*(str+1) & 0x80) >> 7) : 0)]; |
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102
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str++; /* 2 complete, iin=3 */ |
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61
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102
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50
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if (str == end) break; |
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102
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*ptr++ = basis[(*str & 0x7c) >> 2]; |
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102
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if (str == end) { |
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0
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ptr--; /* previous char is useless */ |
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0
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break; |
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} |
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102
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*ptr++ = basis[((*str & 0x03) << 3) | ((str + 1 != end) ? ((*(str+1) & 0xe0) >> 5) : 0)]; |
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102
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str++; /* 3 complete, iin=4 */ |
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102
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if (str == end) break; |
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102
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*ptr++ = basis[*str & 0x1f]; |
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102
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str++; /* 4 complete, iin=5 */ |
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} |
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2
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return ptr - dest; |
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} |
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2
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size_t decode_base32 (const string_view source, char* dest) { |
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2
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const char* str = source.data(); |
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2
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const char* const end = str + source.length(); |
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2
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unsigned char* ptr = (unsigned char*)dest; |
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84
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102
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while (1) { |
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104
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50
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if (str+1 >= end || *str == 0 || str[1] == 0) break; |
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50
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50
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86
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104
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*ptr++ = ((REV32(*str) & 0x1f) << 3) | ((REV32(str[1]) & 0x1c) >> 2); |
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++str; |
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104
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100
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if (str+2 >= end || str[1] == 0 || str[2] == 0) break; |
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50
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90
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102
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*ptr++ = ((REV32(*str) & 0x03) << 6) | ((REV32(str[1]) & 0x1f) << 1) | ((REV32(str[2]) & 0x10) >> 4); |
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102
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str += 2; |
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102
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if (str+1 == end || str[1] == 0) break; |
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102
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*ptr++ = ((REV32(*str) & 0x0f) << 4) | ((REV32(str[1]) & 0x1e) >> 1); |
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102
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++str; |
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102
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if (str+2 >= end || str[1] == 0 || str[2] == 0) break; |
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50
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98
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102
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*ptr++ = ((REV32(*str) & 0x01) << 7) | ((REV32(str[1]) & 0x1f) << 2) | ((REV32(str[2]) & 0x18) >> 3); |
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102
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str += 2; |
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101
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102
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if (str+1 == end || str[1] == 0) break; |
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102
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102
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*ptr++ = ((REV32(*str) & 0x07) << 5) | ((REV32(str[1]) & 0x1f)); |
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102
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str += 2; |
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} |
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2
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return (char*)ptr - dest; |
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} |
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}} |