85 lines
4.0 KiB
C
85 lines
4.0 KiB
C
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/*
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punycode.h from RFC 3492
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http://www.nicemice.net/idn/
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Adam M. Costello
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http://www.nicemice.net/amc/
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This is ANSI C code (C89) implementing Punycode (RFC 3492).
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*/
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#include <limits.h>
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enum punycode_status {
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punycode_success,
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punycode_bad_input, /* Input is invalid. */
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punycode_big_output, /* Output would exceed the space provided. */
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punycode_overflow /* Input needs wider integers to process. */
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};
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#if UINT_MAX >= (1 << 26) - 1
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typedef unsigned int punycode_uint;
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#else
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typedef unsigned long punycode_uint;
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#endif
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enum punycode_status punycode_encode(
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punycode_uint input_length,
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const punycode_uint input[],
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const unsigned char case_flags[],
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punycode_uint *output_length,
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char output[] );
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/* punycode_encode() converts Unicode to Punycode. The input */
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/* is represented as an array of Unicode code points (not code */
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/* units; surrogate pairs are not allowed), and the output */
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/* will be represented as an array of ASCII code points. The */
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/* output string is *not* null-terminated; it will contain */
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/* zeros if and only if the input contains zeros. (Of course */
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/* the caller can leave room for a terminator and add one if */
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/* needed.) The input_length is the number of code points in */
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/* the input. The output_length is an in/out argument: the */
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/* caller passes in the maximum number of code points that it */
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/* can receive, and on successful return it will contain the */
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/* number of code points actually output. The case_flags array */
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/* holds input_length boolean values, where nonzero suggests that */
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/* the corresponding Unicode character be forced to uppercase */
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/* after being decoded (if possible), and zero suggests that */
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/* it be forced to lowercase (if possible). ASCII code points */
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/* are encoded literally, except that ASCII letters are forced */
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/* to uppercase or lowercase according to the corresponding */
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/* uppercase flags. If case_flags is a null pointer then ASCII */
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/* letters are left as they are, and other code points are */
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/* treated as if their uppercase flags were zero. The return */
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/* value can be any of the punycode_status values defined above */
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/* except punycode_bad_input; if not punycode_success, then */
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/* output_size and output might contain garbage. */
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enum punycode_status punycode_decode(
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punycode_uint input_length,
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const char input[],
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punycode_uint *output_length,
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punycode_uint output[],
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unsigned char case_flags[] );
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/* punycode_decode() converts Punycode to Unicode. The input is */
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/* represented as an array of ASCII code points, and the output */
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/* will be represented as an array of Unicode code points. The */
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/* input_length is the number of code points in the input. The */
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/* output_length is an in/out argument: the caller passes in */
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/* the maximum number of code points that it can receive, and */
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/* on successful return it will contain the actual number of */
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/* code points output. The case_flags array needs room for at */
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/* least output_length values, or it can be a null pointer if the */
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/* case information is not needed. A nonzero flag suggests that */
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/* the corresponding Unicode character be forced to uppercase */
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/* by the caller (if possible), while zero suggests that it be */
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/* forced to lowercase (if possible). ASCII code points are */
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/* output already in the proper case, but their flags will be set */
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/* appropriately so that applying the flags would be harmless. */
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/* The return value can be any of the punycode_status values */
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/* defined above; if not punycode_success, then output_length, */
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/* output, and case_flags might contain garbage. On success, the */
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/* decoder will never need to write an output_length greater than */
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/* input_length, because of how the encoding is defined. */
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