Improve UTF-8 decoding and encoding functions #410
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Ensure proper UTF-8 encoding (1 to 4 bytes). Handle invalid encodings (return 0xFFFD and consume a single byte) Individually encoded surrogate code points are accepted. - add `utf8_scan()` to analyze a byte array for UTF-8 contents detects invalid encoding, computes number of codepoints and content kind: plain ASCII, 8-bit, 16-bit or larger codepoints. - add `utf8_encode_len(c)` to compute the number of bytes to encode `c` - rename `unicode_to_utf8` as `utf8_encode` - rename `unicode_from_utf8` as `utf8_decode` - add `utf8_decode_buf8(dest, size, src, len)` to decode a UTF-8 encoded byte array known to contain only ASCII and 8-bit codepoints. - add `utf8_decode_buf16(dest, size, src, len)` to decode a UTF-8 encoded byte array into an array of 16-bit codepoints using UTF-16 surrogate pairs for non-BMP1 codepoints. - add `utf8_encode_buf8(dest, size, src, len)` to encode an array of 8-bit codepoints as a UTF-8 encoded null terminated string - add `utf16_encode_buf8(dest, size, src, len)` to decode an array of 16-bit codepoints (including surrogate pairs) as a UTF-8 encoded null terminated string - detect invalid UTF-8 encoding in RegExp parser - simplify `JS_AtomGetStrRT`, `JS_NewStringLen` using the above functions - simplify UTF-8 decoding and error testing
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Ensure proper UTF-8 encoding (1 to 4 bytes).
Handle invalid encodings (return 0xFFFD and consume a single byte) Individually encoded surrogate code points are accepted.
utf8_scan()to analyze a byte array for UTF-8 contents detects invalid encoding, computes number of codepoints and content kind: plain ASCII, 8-bit, 16-bit or larger codepoints.utf8_encode_len(c)to compute the number of bytes to encodecunicode_to_utf8asutf8_encodeunicode_from_utf8asutf8_decodeutf8_decode_buf8(dest, size, src, len)to decode a UTF-8 encoded byte array known to contain only ASCII and 8-bit codepoints.utf8_decode_buf16(dest, size, src, len)to decode a UTF-8 encoded byte array into an array of 16-bit codepoints using UTF-16 surrogate pairs for non-BMP1 codepoints.utf8_encode_buf8(dest, size, src, len)to encode an array of 8-bit codepoints as a UTF-8 encoded null terminated stringutf16_encode_buf8(dest, size, src, len)to decode an array of 16-bit codepoints (including surrogate pairs) as a UTF-8 encoded null terminated stringJS_AtomGetStrRT,JS_NewStringLenusing the above functionsThis commit is preliminary for another PR fixing some
JSAtomcreation inconsistencies and inefficiencies.