65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
#include "utf8validator.h"
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static const uint8_t UTF8VALIDATOR_DFA[] =
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{
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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, // 00..1f
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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, // 20..3f
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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, // 40..5f
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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, // 60..7f
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, // 80..9f
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, // a0..bf
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8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, // c0..df
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0xa,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x3,0x3, // e0..ef
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0xb,0x6,0x6,0x6,0x5,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8, // f0..ff
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0x0,0x1,0x2,0x3,0x5,0x8,0x7,0x1,0x1,0x1,0x4,0x6,0x1,0x1,0x1,0x1, // s0..s0
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,0,1,0,1,1,1,1,1,1, // s1..s2
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1,2,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1, // s3..s4
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1,2,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,3,1,3,1,1,1,1,1,1, // s5..s6
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1,3,1,1,1,1,1,3,1,3,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,1,1,1,1 // s7..s8
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};
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#define UTF8_ACCEPT 0
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#define UTF8_REJECT 1
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void utf8vld_reset (utf8_validator_t* validator) {
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validator->state = UTF8_ACCEPT;
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validator->current_index = 0;
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validator->total_index = 0;
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validator->is_valid = 1;
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validator->ends_on_codepoint = 1;
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}
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void utf8vld_validate (utf8_validator_t* validator, const uint8_t* data, size_t offset, size_t length) {
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int state = validator->state;
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for (size_t i = offset; i < length + offset; ++i) {
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state = UTF8VALIDATOR_DFA[256 + (state << 4) + UTF8VALIDATOR_DFA[data[i]]];
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if (state == UTF8_REJECT)
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{
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validator->state = state;
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validator->current_index = i - offset;
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validator->total_index += i - offset;
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validator->is_valid = 0;
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validator->ends_on_codepoint = 0;
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return;
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}
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}
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validator->state = state;
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validator->current_index = length;
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validator->total_index += length;
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validator->is_valid = 1;
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validator->ends_on_codepoint = validator->state == UTF8_ACCEPT;
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}
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int utf8_valid(const uint8_t* data, size_t len) {
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utf8_validator_t validator;
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utf8vld_reset(&validator);
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utf8vld_validate(&validator, data, 0, len);
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return validator.is_valid;
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}
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