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93 lines
3.9 KiB
93 lines
3.9 KiB
2 years ago
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#include <stdio.h>
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/*
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* http://www.unicode.org/versions/Unicode6.0.0/ch03.pdf - page 94
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*
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* Table 3-7. Well-Formed UTF-8 Byte Sequences
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*
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* +--------------------+------------+-------------+------------+-------------+
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* | Code Points | First Byte | Second Byte | Third Byte | Fourth Byte |
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* +--------------------+------------+-------------+------------+-------------+
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* | U+0000..U+007F | 00..7F | | | |
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* +--------------------+------------+-------------+------------+-------------+
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* | U+0080..U+07FF | C2..DF | 80..BF | | |
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* +--------------------+------------+-------------+------------+-------------+
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* | U+0800..U+0FFF | E0 | A0..BF | 80..BF | |
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* +--------------------+------------+-------------+------------+-------------+
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* | U+1000..U+CFFF | E1..EC | 80..BF | 80..BF | |
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* +--------------------+------------+-------------+------------+-------------+
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* | U+D000..U+D7FF | ED | 80..9F | 80..BF | |
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* +--------------------+------------+-------------+------------+-------------+
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* | U+E000..U+FFFF | EE..EF | 80..BF | 80..BF | |
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* +--------------------+------------+-------------+------------+-------------+
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* | U+10000..U+3FFFF | F0 | 90..BF | 80..BF | 80..BF |
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* +--------------------+------------+-------------+------------+-------------+
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* | U+40000..U+FFFFF | F1..F3 | 80..BF | 80..BF | 80..BF |
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* +--------------------+------------+-------------+------------+-------------+
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* | U+100000..U+10FFFF | F4 | 80..8F | 80..BF | 80..BF |
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* +--------------------+------------+-------------+------------+-------------+
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*/
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/* Return 0 - success, >0 - index(1 based) of first error char */
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int utf8_naive(const unsigned char *data, int len)
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{
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int err_pos = 1;
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while (len) {
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int bytes;
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const unsigned char byte1 = data[0];
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/* 00..7F */
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if (byte1 <= 0x7F) {
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bytes = 1;
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/* C2..DF, 80..BF */
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} else if (len >= 2 && byte1 >= 0xC2 && byte1 <= 0xDF &&
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(signed char)data[1] <= (signed char)0xBF) {
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bytes = 2;
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} else if (len >= 3) {
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const unsigned char byte2 = data[1];
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/* Is byte2, byte3 between 0x80 ~ 0xBF */
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const int byte2_ok = (signed char)byte2 <= (signed char)0xBF;
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const int byte3_ok = (signed char)data[2] <= (signed char)0xBF;
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if (byte2_ok && byte3_ok &&
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/* E0, A0..BF, 80..BF */
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((byte1 == 0xE0 && byte2 >= 0xA0) ||
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/* E1..EC, 80..BF, 80..BF */
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(byte1 >= 0xE1 && byte1 <= 0xEC) ||
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/* ED, 80..9F, 80..BF */
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(byte1 == 0xED && byte2 <= 0x9F) ||
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/* EE..EF, 80..BF, 80..BF */
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(byte1 >= 0xEE && byte1 <= 0xEF))) {
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bytes = 3;
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} else if (len >= 4) {
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/* Is byte4 between 0x80 ~ 0xBF */
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const int byte4_ok = (signed char)data[3] <= (signed char)0xBF;
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if (byte2_ok && byte3_ok && byte4_ok &&
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/* F0, 90..BF, 80..BF, 80..BF */
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((byte1 == 0xF0 && byte2 >= 0x90) ||
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/* F1..F3, 80..BF, 80..BF, 80..BF */
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(byte1 >= 0xF1 && byte1 <= 0xF3) ||
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/* F4, 80..8F, 80..BF, 80..BF */
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(byte1 == 0xF4 && byte2 <= 0x8F))) {
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bytes = 4;
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} else {
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return err_pos;
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}
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} else {
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return err_pos;
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}
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} else {
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return err_pos;
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}
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len -= bytes;
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err_pos += bytes;
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data += bytes;
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}
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return 0;
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}
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