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Message generation/parsing context. Charset conversion options. Preli…
…minary implementation of RFC-6532.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,263 @@ | ||
| /* | ||
| punycode.c from RFC 3492 | ||
| http://www.nicemice.net/idn/ | ||
| Adam M. Costello | ||
| http://www.nicemice.net/amc/ | ||
| This is ANSI C code (C89) implementing Punycode (RFC 3492). | ||
| */ | ||
|
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| #include <string.h> | ||
|
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| /*** Bootstring parameters for Punycode ***/ | ||
|
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| enum { base = 36, tmin = 1, tmax = 26, skew = 38, damp = 700, | ||
| initial_bias = 72, initial_n = 0x80, delimiter = 0x2D }; | ||
|
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| /* basic(cp) tests whether cp is a basic code point: */ | ||
| #define basic(cp) ((punycode_uint)(cp) < 0x80) | ||
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| /* delim(cp) tests whether cp is a delimiter: */ | ||
| #define delim(cp) ((cp) == delimiter) | ||
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| /* decode_digit(cp) returns the numeric value of a basic code */ | ||
| /* point (for use in representing integers) in the range 0 to */ | ||
| /* base-1, or base if cp is does not represent a value. */ | ||
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| static punycode_uint decode_digit(punycode_uint cp) | ||
| { | ||
| return cp - 48 < 10 ? cp - 22 : cp - 65 < 26 ? cp - 65 : | ||
| cp - 97 < 26 ? cp - 97 : (punycode_uint) base; | ||
| } | ||
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| /* encode_digit(d,flag) returns the basic code point whose value */ | ||
| /* (when used for representing integers) is d, which needs to be in */ | ||
| /* the range 0 to base-1. The lowercase form is used unless flag is */ | ||
| /* nonzero, in which case the uppercase form is used. The behavior */ | ||
| /* is undefined if flag is nonzero and digit d has no uppercase form. */ | ||
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| static char encode_digit(punycode_uint d, int flag) | ||
| { | ||
| return d + 22 + 75 * (d < 26) - ((flag != 0) << 5); | ||
| /* 0..25 map to ASCII a..z or A..Z */ | ||
| /* 26..35 map to ASCII 0..9 */ | ||
| } | ||
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| /* flagged(bcp) tests whether a basic code point is flagged */ | ||
| /* (uppercase). The behavior is undefined if bcp is not a */ | ||
| /* basic code point. */ | ||
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| #define flagged(bcp) ((punycode_uint)(bcp) - 65 < 26) | ||
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| /* encode_basic(bcp,flag) forces a basic code point to lowercase */ | ||
| /* if flag is zero, uppercase if flag is nonzero, and returns */ | ||
| /* the resulting code point. The code point is unchanged if it */ | ||
| /* is caseless. The behavior is undefined if bcp is not a basic */ | ||
| /* code point. */ | ||
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| static char encode_basic(punycode_uint bcp, int flag) | ||
| { | ||
| bcp -= (bcp - 97 < 26) << 5; | ||
| return bcp + ((!flag && (bcp - 65 < 26)) << 5); | ||
| } | ||
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| /*** Platform-specific constants ***/ | ||
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| /* maxint is the maximum value of a punycode_uint variable: */ | ||
| static const punycode_uint maxint = -1U; | ||
| /* Because maxint is unsigned, -1 becomes the maximum value. */ | ||
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| /*** Bias adaptation function ***/ | ||
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| static punycode_uint adapt( | ||
| punycode_uint delta, punycode_uint numpoints, int firsttime ) | ||
| { | ||
| punycode_uint k; | ||
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| delta = firsttime ? delta / damp : delta >> 1; | ||
| /* delta >> 1 is a faster way of doing delta / 2 */ | ||
| delta += delta / numpoints; | ||
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| for (k = 0; delta > ((base - tmin) * tmax) / 2; k += base) { | ||
| delta /= base - tmin; | ||
| } | ||
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| return k + (base - tmin + 1) * delta / (delta + skew); | ||
| } | ||
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| /*** Main encode function ***/ | ||
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| enum punycode_status punycode_encode( | ||
| punycode_uint input_length, | ||
| const punycode_uint input[], | ||
| const unsigned char case_flags[], | ||
| punycode_uint *output_length, | ||
| char output[] ) | ||
| { | ||
| punycode_uint n, delta, h, b, out, max_out, bias, j, m, q, k, t; | ||
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| /* Initialize the state: */ | ||
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| n = initial_n; | ||
| delta = out = 0; | ||
| max_out = *output_length; | ||
| bias = initial_bias; | ||
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| /* Handle the basic code points: */ | ||
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| for (j = 0; j < input_length; ++j) { | ||
| if (basic(input[j])) { | ||
| if (max_out - out < 2) return punycode_big_output; | ||
| output[out++] = | ||
| case_flags ? encode_basic(input[j], case_flags[j]) : input[j]; | ||
| } | ||
| /* else if (input[j] < n) return punycode_bad_input; */ | ||
| /* (not needed for Punycode with unsigned code points) */ | ||
| } | ||
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| h = b = out; | ||
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| /* h is the number of code points that have been handled, b is the */ | ||
| /* number of basic code points, and out is the number of characters */ | ||
| /* that have been output. */ | ||
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| if (b > 0) output[out++] = delimiter; | ||
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| /* Main encoding loop: */ | ||
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| while (h < input_length) { | ||
| /* All non-basic code points < n have been */ | ||
| /* handled already. Find the next larger one: */ | ||
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| for (m = maxint, j = 0; j < input_length; ++j) { | ||
| /* if (basic(input[j])) continue; */ | ||
| /* (not needed for Punycode) */ | ||
| if (input[j] >= n && input[j] < m) m = input[j]; | ||
| } | ||
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| /* Increase delta enough to advance the decoder's */ | ||
| /* <n,i> state to <m,0>, but guard against overflow: */ | ||
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| if (m - n > (maxint - delta) / (h + 1)) return punycode_overflow; | ||
| delta += (m - n) * (h + 1); | ||
| n = m; | ||
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| for (j = 0; j < input_length; ++j) { | ||
| /* Punycode does not need to check whether input[j] is basic: */ | ||
| if (input[j] < n /* || basic(input[j]) */ ) { | ||
| if (++delta == 0) return punycode_overflow; | ||
| } | ||
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| if (input[j] == n) { | ||
| /* Represent delta as a generalized variable-length integer: */ | ||
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| for (q = delta, k = base; ; k += base) { | ||
| if (out >= max_out) return punycode_big_output; | ||
| t = k <= bias /* + tmin */ ? (punycode_uint) tmin : /* +tmin not needed */ | ||
| k >= (punycode_uint) bias + (punycode_uint) tmax ? (punycode_uint) tmax : k - (punycode_uint) bias; | ||
| if (q < t) break; | ||
| output[out++] = encode_digit(t + (q - t) % (base - t), 0); | ||
| q = (q - t) / (base - t); | ||
| } | ||
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| output[out++] = encode_digit(q, case_flags && case_flags[j]); | ||
| bias = adapt(delta, h + 1, h == b); | ||
| delta = 0; | ||
| ++h; | ||
| } | ||
| } | ||
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| ++delta, ++n; | ||
| } | ||
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| *output_length = out; | ||
| return punycode_success; | ||
| } | ||
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| /*** Main decode function ***/ | ||
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| enum punycode_status punycode_decode( | ||
| punycode_uint input_length, | ||
| const char input[], | ||
| punycode_uint *output_length, | ||
| punycode_uint output[], | ||
| unsigned char case_flags[] ) | ||
| { | ||
| punycode_uint n, out, i, max_out, bias, | ||
| b, j, in, oldi, w, k, digit, t; | ||
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| /* Initialize the state: */ | ||
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| n = initial_n; | ||
| out = i = 0; | ||
| max_out = *output_length; | ||
| bias = initial_bias; | ||
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| /* Handle the basic code points: Let b be the number of input code */ | ||
| /* points before the last delimiter, or 0 if there is none, then */ | ||
| /* copy the first b code points to the output. */ | ||
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| for (b = j = 0; j < input_length; ++j) if (delim(input[j])) b = j; | ||
| if (b > max_out) return punycode_big_output; | ||
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| for (j = 0; j < b; ++j) { | ||
| if (case_flags) case_flags[out] = flagged(input[j]); | ||
| if (!basic(input[j])) return punycode_bad_input; | ||
| output[out++] = input[j]; | ||
| } | ||
|
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| /* Main decoding loop: Start just after the last delimiter if any */ | ||
| /* basic code points were copied; start at the beginning otherwise. */ | ||
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| for (in = b > 0 ? b + 1 : 0; in < input_length; ++out) { | ||
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| /* in is the index of the next character to be consumed, and */ | ||
| /* out is the number of code points in the output array. */ | ||
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| /* Decode a generalized variable-length integer into delta, */ | ||
| /* which gets added to i. The overflow checking is easier */ | ||
| /* if we increase i as we go, then subtract off its starting */ | ||
| /* value at the end to obtain delta. */ | ||
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| for (oldi = i, w = 1, k = base; ; k += base) { | ||
| if (in >= input_length) return punycode_bad_input; | ||
| digit = decode_digit(input[in++]); | ||
| if (digit >= base) return punycode_bad_input; | ||
| if (digit > (maxint - i) / w) return punycode_overflow; | ||
| i += digit * w; | ||
| t = k <= (punycode_uint) bias /* + tmin */ ? (punycode_uint) tmin : /* +tmin not needed */ | ||
| k >= (punycode_uint) bias + (punycode_uint) tmax ? (punycode_uint) tmax : k - (punycode_uint) bias; | ||
| if (digit < t) break; | ||
| if (w > maxint / (base - t)) return punycode_overflow; | ||
| w *= (base - t); | ||
| } | ||
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| bias = adapt(i - oldi, out + 1, oldi == 0); | ||
|
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| /* i was supposed to wrap around from out+1 to 0, */ | ||
| /* incrementing n each time, so we'll fix that now: */ | ||
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| if (i / (out + 1) > maxint - n) return punycode_overflow; | ||
| n += i / (out + 1); | ||
| i %= (out + 1); | ||
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| /* Insert n at position i of the output: */ | ||
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| /* not needed for Punycode: */ | ||
| /* if (decode_digit(n) <= base) return punycode_invalid_input; */ | ||
| if (out >= max_out) return punycode_big_output; | ||
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| if (case_flags) { | ||
| memmove(case_flags + i + 1, case_flags + i, out - i); | ||
| /* Case of last character determines uppercase flag: */ | ||
| case_flags[i] = flagged(input[in - 1]); | ||
| } | ||
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| memmove(output + i + 1, output + i, (out - i) * sizeof *output); | ||
| output[i++] = n; | ||
| } | ||
|
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| *output_length = out; | ||
| return punycode_success; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| /* | ||
| punycode.h from RFC 3492 | ||
| http://www.nicemice.net/idn/ | ||
| Adam M. Costello | ||
| http://www.nicemice.net/amc/ | ||
| This is ANSI C code (C89) implementing Punycode (RFC 3492). | ||
| */ | ||
|
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| #include <limits.h> | ||
|
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| enum punycode_status { | ||
| punycode_success, | ||
| punycode_bad_input, /* Input is invalid. */ | ||
| punycode_big_output, /* Output would exceed the space provided. */ | ||
| punycode_overflow /* Input needs wider integers to process. */ | ||
| }; | ||
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| #if UINT_MAX >= (1 << 26) - 1 | ||
| typedef unsigned int punycode_uint; | ||
| #else | ||
| typedef unsigned long punycode_uint; | ||
| #endif | ||
|
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| enum punycode_status punycode_encode( | ||
| punycode_uint input_length, | ||
| const punycode_uint input[], | ||
| const unsigned char case_flags[], | ||
| punycode_uint *output_length, | ||
| char output[] ); | ||
|
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| /* punycode_encode() converts Unicode to Punycode. The input */ | ||
| /* is represented as an array of Unicode code points (not code */ | ||
| /* units; surrogate pairs are not allowed), and the output */ | ||
| /* will be represented as an array of ASCII code points. The */ | ||
| /* output string 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.) The input_length is the number of code points in */ | ||
| /* the input. The output_length is an in/out argument: the */ | ||
| /* caller passes in the maximum number of code points that it */ | ||
| /* can receive, and on successful return it will contain the */ | ||
| /* number of code points actually output. The case_flags array */ | ||
| /* holds input_length boolean values, where nonzero suggests that */ | ||
| /* the corresponding Unicode character be forced to uppercase */ | ||
| /* after being decoded (if possible), and zero suggests that */ | ||
| /* it be forced to lowercase (if possible). ASCII code points */ | ||
| /* are encoded literally, except that ASCII letters are forced */ | ||
| /* to uppercase or lowercase according to the corresponding */ | ||
| /* uppercase flags. If case_flags is a null pointer then ASCII */ | ||
| /* letters are left as they are, and other code points are */ | ||
| /* treated as if their uppercase flags were zero. 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. */ | ||
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| enum punycode_status punycode_decode( | ||
| punycode_uint input_length, | ||
| const char input[], | ||
| punycode_uint *output_length, | ||
| punycode_uint output[], | ||
| unsigned char case_flags[] ); | ||
|
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| /* punycode_decode() converts Punycode to Unicode. The input is */ | ||
| /* represented as an array of ASCII code points, and the output */ | ||
| /* will be represented as an array of Unicode code points. The */ | ||
| /* input_length is the number of code points in the input. The */ | ||
| /* output_length is an in/out argument: the caller passes in */ | ||
| /* the maximum number of code points that it can receive, and */ | ||
| /* on successful return it will contain the actual number of */ | ||
| /* code points output. The case_flags array needs room for at */ | ||
| /* least output_length values, or it can be a null pointer if the */ | ||
| /* case information is not needed. A nonzero flag suggests that */ | ||
| /* the corresponding Unicode character be forced to uppercase */ | ||
| /* by the caller (if possible), while zero suggests that it be */ | ||
| /* forced to lowercase (if possible). ASCII code points are */ | ||
| /* output already in the proper case, but their flags will be set */ | ||
| /* appropriately so that applying the flags would be harmless. */ | ||
| /* 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. On success, the */ | ||
| /* decoder will never need to write an output_length greater than */ | ||
| /* input_length, because of how the encoding is defined. */ |
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