Unicode

Unicode — Unicode utility functions.

Synopsis

typedef             librdf_unichar;
int                 librdf_unicode_char_to_utf8         (librdf_unichar c,
                                                         byte *output,
                                                         int length);
int                 librdf_utf8_to_unicode_char         (librdf_unichar *output,
                                                         const byte *input,
                                                         int length);
byte*               librdf_utf8_to_latin1               (const byte *input,
                                                         int length,
                                                         int *output_length);
byte*               librdf_latin1_to_utf8               (const byte *input,
                                                         int length,
                                                         int *output_length);
void                librdf_utf8_print                   (const byte *input,
                                                         int length,
                                                         FILE *stream);

Description

Utility functions to convert between UTF-8, full Unicode and Latin-1. Redland uses UTF-8 for all string formats (except where noted) but these may need to be converted to other Unicode encodings or downgraded with loss to Latin-1.

Details

librdf_unichar

typedef u32 librdf_unichar;

Unicode codepoint.

librdf_unicode_char_to_utf8 ()

int                 librdf_unicode_char_to_utf8         (librdf_unichar c,
                                                         byte *output,
                                                         int length);

Convert a Unicode character to UTF-8 encoding.

If buffer is NULL, then will calculate the length rather than perform it. This can be used by the caller to allocate space and then re-call this function with the new buffer.

`c` :	Unicode character
`output` :	UTF-8 string buffer or NULL
`length` :	buffer size
Returns :	bytes written to output buffer or <0 on failure

librdf_utf8_to_unicode_char ()

int                 librdf_utf8_to_unicode_char         (librdf_unichar *output,
                                                         const byte *input,
                                                         int length);

Convert an UTF-8 encoded buffer to a Unicode character.

If output is NULL, then will calculate the number of bytes that will be used from the input buffer and not perform the conversion.

`output` :	Pointer to the Unicode character or NULL
`input` :	UTF-8 string buffer
`length` :	buffer size
Returns :	bytes used from input buffer or <0 on failure

librdf_utf8_to_latin1 ()

byte*               librdf_utf8_to_latin1               (const byte *input,
                                                         int length,
                                                         int *output_length);

Convert a UTF-8 string to ISO Latin-1.

Converts the given UTF-8 string to the ISO Latin-1 subset of Unicode (characters 0x00-0xff), discarding any out of range characters.

If the output_length pointer is not NULL, the returned string length will be stored there.

`input` :	UTF-8 string buffer
`length` :	buffer size
`output_length` :	Pointer to variable to store resulting string length or NULL
Returns :	pointer to new ISO Latin-1 string or NULL on failure

librdf_latin1_to_utf8 ()

byte*               librdf_latin1_to_utf8               (const byte *input,
                                                         int length,
                                                         int *output_length);

Convert an ISO Latin-1 encoded string to UTF-8.

Converts the given ISO Latin-1 string to an UTF-8 encoded string representing the same content. This is lossless.

If the output_length pointer is not NULL, the returned string length will be stored there.

`input` :	ISO Latin-1 string buffer
`length` :	buffer size
`output_length` :	Pointer to variable to store resulting string length or NULL
Returns :	pointer to new UTF-8 string or NULL on failure

librdf_utf8_print ()

void                librdf_utf8_print                   (const byte *input,
                                                         int length,
                                                         FILE *stream);

Print a UTF-8 string to a stream.

Pretty prints the UTF-8 string in a pseudo-C character format like \uhex digits when the characters fail the isprint() test.

`input` :	UTF-8 string buffer
`length` :	buffer size
`stream` :	FILE* stream

			Redland RDF Library Manual
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