Class Latin1Converter
- Since:
- 12.10.2006
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate static final int
private static final int
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic ByteBuffer
convert
(ByteBuffer buffer) A converter that processes a byte buffer containing a mix of UTF8 and Latin-1/Cp1252 chars.private static byte[]
convertToUTF8
(byte ch) Converts a Cp1252 char (contains all Latin-1 chars above 0x80) into a UTF-8 byte sequence.
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Field Details
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STATE_START
private static final int STATE_START- See Also:
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STATE_UTF8CHAR
private static final int STATE_UTF8CHAR- See Also:
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Constructor Details
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Latin1Converter
private Latin1Converter()Private constructor
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Method Details
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convert
A converter that processes a byte buffer containing a mix of UTF8 and Latin-1/Cp1252 chars. The result is a buffer where those chars have been converted to UTF-8; that means it contains only valid UTF-8 chars.Explanation of the processing: First the encoding of the buffer is detected looking at the first four bytes (that works only if the buffer starts with an ASCII-char, like xmls '<'). UTF-16/32 flavours do not require further processing.
In the case, UTF-8 is detected, it assumes wrong UTF8 chars to be a sequence of Latin-1/Cp1252 encoded bytes and converts the chars to their corresponding UTF-8 byte sequence.
The 0x80..0x9F range is undefined in Latin-1, but is defined in Windows code page 1252. The bytes 0x81, 0x8D, 0x8F, 0x90, and 0x9D are formally undefined by Windows 1252. These are in XML's RestrictedChar set, so we map them to a space.
The official Latin-1 characters in the range 0xA0..0xFF are converted into the Unicode Latin Supplement range U+00A0 - U+00FF.
Example: If an Euro-symbol (€) appears in the byte buffer (0xE2, 0x82, 0xAC), it will be left as is. But if only the first two bytes are appearing, followed by an ASCII char a (0xE2 - 0x82 - 0x41), it will be converted to 0xC3, 0xA2 (â) - 0xE2, 0x80, 0x9A (‚) - 0x41 (a).
- Parameters:
buffer
- a byte buffer contain- Returns:
- Returns a new buffer containing valid UTF-8
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convertToUTF8
private static byte[] convertToUTF8(byte ch) Converts a Cp1252 char (contains all Latin-1 chars above 0x80) into a UTF-8 byte sequence. The bytes 0x81, 0x8D, 0x8F, 0x90, and 0x9D are formally undefined by Windows 1252 and therefore replaced by a space (0x20).- Parameters:
ch
- an Cp1252 / Latin-1 byte- Returns:
- Returns a byte array containing a UTF-8 byte sequence.
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