punycode.c File Reference

#include <config.h>
#include <string.h>
#include "punycode.h"

Go to the source code of this file.

Macros
#define	basic(cp)   ((punycode_uint)(cp) < 0x80)
#define	delim(cp)   ((cp) == delimiter)
#define	flagged(bcp)   ((punycode_uint)(bcp) - 65 < 26)

Enumerations
enum	{   base = 36 , tmin = 1 , tmax = 26 , skew = 38 ,   damp = 700 , initial_bias = 72 , initial_n = 0x80 , delimiter = 0x2D }

Functions
int	punycode_encode (size_t input_length, const punycode_uint input[], const unsigned char case_flags[], size_t *output_length, char output[])
int	punycode_decode (size_t input_length, const char input[], size_t *output_length, punycode_uint output[], unsigned char case_flags[])

Macro Definition Documentation

basic

#define basic

(

cp

)

((punycode_uint)(cp) < 0x80)

Definition at line 82 of file punycode.c.

delim

#define delim

(

cp

)

((cp) == delimiter)

Definition at line 85 of file punycode.c.

flagged

#define flagged

(

bcp

)

((punycode_uint)(bcp) - 65 < 26)

Definition at line 116 of file punycode.c.

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
base
tmin
tmax
skew
damp
initial_bias
initial_n
delimiter

Definition at line 76 of file punycode.c.

Function Documentation

punycode_decode()

int punycode_decode	(	size_t	input_length,
		const char	input[],
		size_t *	output_length,
		punycode_uint	output[],
		unsigned char	case_flags[]
	)

punycode_decode:

Parameters

input_length	The number of ASCII code points in the @input array.
input	An array of ASCII code points (0..7F).
output_length	The caller passes in the maximum number of code points that it can receive into the @output array (which is also the maximum number of flags that it can receive into the @case_flags array, if @case_flags is not a NULL pointer). On successful return it will contain the number of code points actually output (which is also the number of flags actually output, if case_flags is not a null pointer). The decoder will never need to output more code points than the number of ASCII code points in the input, because of the way the encoding is defined. The number of code points output cannot exceed the maximum possible value of a punycode_uint, even if the supplied @output_length is greater than that.
output	An array of code points like the input argument of punycode_encode() (see above).
case_flags	A NULL pointer (if the flags are not needed by the caller) or an array of boolean values parallel to the @output array. Nonzero (true, flagged) suggests that the corresponding Unicode character be forced to uppercase by the caller (if possible), and zero (false, unflagged) suggests that it be forced to lowercase (if possible). ASCII code points (0..7F) are output already in the proper case, but their flags will be set appropriately so that applying the flags would be harmless.

Converts Punycode to a sequence of code points (presumed to be Unicode code points).

Return value: The return value can be any of the Punycode_status values defined above. If not PUNYCODE_SUCCESS, then @output_length, @output, and @case_flags might contain garbage.

Definition at line 348 of file punycode.c.

punycode_encode()

int punycode_encode	(	size_t	input_length,
		const punycode_uint	input[],
		const unsigned char	case_flags[],
		size_t *	output_length,
		char	output[]
	)

punycode_encode:

Parameters

input_length	The number of code points in the @input array and the number of flags in the @case_flags array.
input	An array of code points. They are presumed to be Unicode code points, but that is not strictly REQUIRED. The array contains code points, not code units. UTF-16 uses code units D800 through DFFF to refer to code points 10000..10FFFF. The code points D800..DFFF do not occur in any valid Unicode string. The code points that can occur in Unicode strings (0..D7FF and E000..10FFFF) are also called Unicode scalar values.
case_flags	A NULL pointer or an array of boolean values parallel to the @input array. Nonzero (true, flagged) suggests that the corresponding Unicode character be forced to uppercase after being decoded (if possible), and zero (false, unflagged) suggests that it be forced to lowercase (if possible). ASCII code points (0..7F) are encoded literally, except that ASCII letters are forced to uppercase or lowercase according to the corresponding case flags. If @case_flags is a NULL pointer then ASCII letters are left as they are, and other code points are treated as unflagged.
output_length	The caller passes in the maximum number of ASCII code points that it can receive. On successful return it will contain the number of ASCII code points actually output.
output	An array of ASCII code points. It is not null-terminated; it will contain zeros if and only if the @input contains zeros. (Of course the caller can leave room for a terminator and add one if needed.)

Converts a sequence of code points (presumed to be Unicode code points) to Punycode.

Return value: The return value can be any of the Punycode_status values defined above except PUNYCODE_BAD_INPUT. If not PUNYCODE_SUCCESS, then @output_size and @output might contain garbage.

Definition at line 196 of file punycode.c.