595 lines
16 KiB
C
595 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2014 SGI.
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* All rights reserved.
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*/
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#include "utf8n.h"
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int utf8version_is_supported(const struct unicode_map *um, unsigned int version)
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{
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int i = um->tables->utf8agetab_size - 1;
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while (i >= 0 && um->tables->utf8agetab[i] != 0) {
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if (version == um->tables->utf8agetab[i])
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return 1;
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i--;
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}
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return 0;
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}
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/*
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* UTF-8 valid ranges.
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*
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* The UTF-8 encoding spreads the bits of a 32bit word over several
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* bytes. This table gives the ranges that can be held and how they'd
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* be represented.
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*
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* 0x00000000 0x0000007F: 0xxxxxxx
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* 0x00000000 0x000007FF: 110xxxxx 10xxxxxx
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* 0x00000000 0x0000FFFF: 1110xxxx 10xxxxxx 10xxxxxx
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* 0x00000000 0x001FFFFF: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
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* 0x00000000 0x03FFFFFF: 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
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* 0x00000000 0x7FFFFFFF: 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
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*
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* There is an additional requirement on UTF-8, in that only the
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* shortest representation of a 32bit value is to be used. A decoder
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* must not decode sequences that do not satisfy this requirement.
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* Thus the allowed ranges have a lower bound.
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*
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* 0x00000000 0x0000007F: 0xxxxxxx
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* 0x00000080 0x000007FF: 110xxxxx 10xxxxxx
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* 0x00000800 0x0000FFFF: 1110xxxx 10xxxxxx 10xxxxxx
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* 0x00010000 0x001FFFFF: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
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* 0x00200000 0x03FFFFFF: 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
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* 0x04000000 0x7FFFFFFF: 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
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*
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* Actual unicode characters are limited to the range 0x0 - 0x10FFFF,
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* 17 planes of 65536 values. This limits the sequences actually seen
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* even more, to just the following.
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*
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* 0 - 0x7F: 0 - 0x7F
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* 0x80 - 0x7FF: 0xC2 0x80 - 0xDF 0xBF
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* 0x800 - 0xFFFF: 0xE0 0xA0 0x80 - 0xEF 0xBF 0xBF
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* 0x10000 - 0x10FFFF: 0xF0 0x90 0x80 0x80 - 0xF4 0x8F 0xBF 0xBF
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*
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* Within those ranges the surrogates 0xD800 - 0xDFFF are not allowed.
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*
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* Note that the longest sequence seen with valid usage is 4 bytes,
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* the same a single UTF-32 character. This makes the UTF-8
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* representation of Unicode strictly smaller than UTF-32.
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*
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* The shortest sequence requirement was introduced by:
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* Corrigendum #1: UTF-8 Shortest Form
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* It can be found here:
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* http://www.unicode.org/versions/corrigendum1.html
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*
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*/
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/*
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* Return the number of bytes used by the current UTF-8 sequence.
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* Assumes the input points to the first byte of a valid UTF-8
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* sequence.
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*/
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static inline int utf8clen(const char *s)
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{
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unsigned char c = *s;
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return 1 + (c >= 0xC0) + (c >= 0xE0) + (c >= 0xF0);
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}
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/*
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* Decode a 3-byte UTF-8 sequence.
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*/
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static unsigned int
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utf8decode3(const char *str)
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{
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unsigned int uc;
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uc = *str++ & 0x0F;
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uc <<= 6;
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uc |= *str++ & 0x3F;
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uc <<= 6;
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uc |= *str++ & 0x3F;
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return uc;
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}
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/*
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* Encode a 3-byte UTF-8 sequence.
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*/
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static int
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utf8encode3(char *str, unsigned int val)
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{
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str[2] = (val & 0x3F) | 0x80;
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val >>= 6;
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str[1] = (val & 0x3F) | 0x80;
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val >>= 6;
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str[0] = val | 0xE0;
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return 3;
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}
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/*
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* utf8trie_t
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*
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* A compact binary tree, used to decode UTF-8 characters.
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*
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* Internal nodes are one byte for the node itself, and up to three
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* bytes for an offset into the tree. The first byte contains the
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* following information:
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* NEXTBYTE - flag - advance to next byte if set
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* BITNUM - 3 bit field - the bit number to tested
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* OFFLEN - 2 bit field - number of bytes in the offset
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* if offlen == 0 (non-branching node)
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* RIGHTPATH - 1 bit field - set if the following node is for the
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* right-hand path (tested bit is set)
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* TRIENODE - 1 bit field - set if the following node is an internal
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* node, otherwise it is a leaf node
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* if offlen != 0 (branching node)
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* LEFTNODE - 1 bit field - set if the left-hand node is internal
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* RIGHTNODE - 1 bit field - set if the right-hand node is internal
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*
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* Due to the way utf8 works, there cannot be branching nodes with
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* NEXTBYTE set, and moreover those nodes always have a righthand
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* descendant.
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*/
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typedef const unsigned char utf8trie_t;
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#define BITNUM 0x07
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#define NEXTBYTE 0x08
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#define OFFLEN 0x30
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#define OFFLEN_SHIFT 4
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#define RIGHTPATH 0x40
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#define TRIENODE 0x80
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#define RIGHTNODE 0x40
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#define LEFTNODE 0x80
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/*
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* utf8leaf_t
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*
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* The leaves of the trie are embedded in the trie, and so the same
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* underlying datatype: unsigned char.
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*
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* leaf[0]: The unicode version, stored as a generation number that is
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* an index into ->utf8agetab[]. With this we can filter code
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* points based on the unicode version in which they were
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* defined. The CCC of a non-defined code point is 0.
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* leaf[1]: Canonical Combining Class. During normalization, we need
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* to do a stable sort into ascending order of all characters
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* with a non-zero CCC that occur between two characters with
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* a CCC of 0, or at the begin or end of a string.
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* The unicode standard guarantees that all CCC values are
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* between 0 and 254 inclusive, which leaves 255 available as
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* a special value.
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* Code points with CCC 0 are known as stoppers.
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* leaf[2]: Decomposition. If leaf[1] == 255, then leaf[2] is the
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* start of a NUL-terminated string that is the decomposition
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* of the character.
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* The CCC of a decomposable character is the same as the CCC
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* of the first character of its decomposition.
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* Some characters decompose as the empty string: these are
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* characters with the Default_Ignorable_Code_Point property.
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* These do affect normalization, as they all have CCC 0.
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*
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* The decompositions in the trie have been fully expanded, with the
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* exception of Hangul syllables, which are decomposed algorithmically.
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*
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* Casefolding, if applicable, is also done using decompositions.
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*
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* The trie is constructed in such a way that leaves exist for all
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* UTF-8 sequences that match the criteria from the "UTF-8 valid
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* ranges" comment above, and only for those sequences. Therefore a
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* lookup in the trie can be used to validate the UTF-8 input.
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*/
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typedef const unsigned char utf8leaf_t;
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#define LEAF_GEN(LEAF) ((LEAF)[0])
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#define LEAF_CCC(LEAF) ((LEAF)[1])
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#define LEAF_STR(LEAF) ((const char *)((LEAF) + 2))
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#define MINCCC (0)
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#define MAXCCC (254)
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#define STOPPER (0)
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#define DECOMPOSE (255)
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/* Marker for hangul syllable decomposition. */
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#define HANGUL ((char)(255))
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/* Size of the synthesized leaf used for Hangul syllable decomposition. */
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#define UTF8HANGULLEAF (12)
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/*
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* Hangul decomposition (algorithm from Section 3.12 of Unicode 6.3.0)
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*
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* AC00;<Hangul Syllable, First>;Lo;0;L;;;;;N;;;;;
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* D7A3;<Hangul Syllable, Last>;Lo;0;L;;;;;N;;;;;
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*
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* SBase = 0xAC00
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* LBase = 0x1100
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* VBase = 0x1161
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* TBase = 0x11A7
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* LCount = 19
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* VCount = 21
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* TCount = 28
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* NCount = 588 (VCount * TCount)
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* SCount = 11172 (LCount * NCount)
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*
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* Decomposition:
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* SIndex = s - SBase
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*
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* LV (Canonical/Full)
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* LIndex = SIndex / NCount
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* VIndex = (Sindex % NCount) / TCount
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* LPart = LBase + LIndex
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* VPart = VBase + VIndex
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*
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* LVT (Canonical)
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* LVIndex = (SIndex / TCount) * TCount
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* TIndex = (Sindex % TCount)
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* LVPart = SBase + LVIndex
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* TPart = TBase + TIndex
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*
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* LVT (Full)
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* LIndex = SIndex / NCount
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* VIndex = (Sindex % NCount) / TCount
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* TIndex = (Sindex % TCount)
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* LPart = LBase + LIndex
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* VPart = VBase + VIndex
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* if (TIndex == 0) {
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* d = <LPart, VPart>
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* } else {
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* TPart = TBase + TIndex
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* d = <LPart, TPart, VPart>
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* }
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*/
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/* Constants */
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#define SB (0xAC00)
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#define LB (0x1100)
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#define VB (0x1161)
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#define TB (0x11A7)
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#define LC (19)
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#define VC (21)
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#define TC (28)
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#define NC (VC * TC)
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#define SC (LC * NC)
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/* Algorithmic decomposition of hangul syllable. */
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static utf8leaf_t *
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utf8hangul(const char *str, unsigned char *hangul)
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{
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unsigned int si;
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unsigned int li;
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unsigned int vi;
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unsigned int ti;
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unsigned char *h;
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/* Calculate the SI, LI, VI, and TI values. */
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si = utf8decode3(str) - SB;
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li = si / NC;
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vi = (si % NC) / TC;
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ti = si % TC;
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/* Fill in base of leaf. */
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h = hangul;
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LEAF_GEN(h) = 2;
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LEAF_CCC(h) = DECOMPOSE;
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h += 2;
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/* Add LPart, a 3-byte UTF-8 sequence. */
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h += utf8encode3((char *)h, li + LB);
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/* Add VPart, a 3-byte UTF-8 sequence. */
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h += utf8encode3((char *)h, vi + VB);
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/* Add TPart if required, also a 3-byte UTF-8 sequence. */
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if (ti)
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h += utf8encode3((char *)h, ti + TB);
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/* Terminate string. */
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h[0] = '\0';
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return hangul;
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}
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/*
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* Use trie to scan s, touching at most len bytes.
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* Returns the leaf if one exists, NULL otherwise.
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*
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* A non-NULL return guarantees that the UTF-8 sequence starting at s
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* is well-formed and corresponds to a known unicode code point. The
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* shorthand for this will be "is valid UTF-8 unicode".
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*/
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static utf8leaf_t *utf8nlookup(const struct unicode_map *um,
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enum utf8_normalization n, unsigned char *hangul, const char *s,
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size_t len)
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{
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utf8trie_t *trie = um->tables->utf8data + um->ntab[n]->offset;
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int offlen;
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int offset;
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int mask;
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int node;
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if (len == 0)
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return NULL;
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node = 1;
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while (node) {
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offlen = (*trie & OFFLEN) >> OFFLEN_SHIFT;
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if (*trie & NEXTBYTE) {
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if (--len == 0)
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return NULL;
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s++;
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}
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mask = 1 << (*trie & BITNUM);
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if (*s & mask) {
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/* Right leg */
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if (offlen) {
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/* Right node at offset of trie */
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node = (*trie & RIGHTNODE);
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offset = trie[offlen];
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while (--offlen) {
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offset <<= 8;
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offset |= trie[offlen];
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}
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trie += offset;
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} else if (*trie & RIGHTPATH) {
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/* Right node after this node */
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node = (*trie & TRIENODE);
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trie++;
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} else {
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/* No right node. */
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return NULL;
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}
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} else {
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/* Left leg */
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if (offlen) {
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/* Left node after this node. */
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node = (*trie & LEFTNODE);
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trie += offlen + 1;
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} else if (*trie & RIGHTPATH) {
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/* No left node. */
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return NULL;
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} else {
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/* Left node after this node */
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node = (*trie & TRIENODE);
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trie++;
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}
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}
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}
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/*
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* Hangul decomposition is done algorithmically. These are the
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* codepoints >= 0xAC00 and <= 0xD7A3. Their UTF-8 encoding is
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* always 3 bytes long, so s has been advanced twice, and the
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* start of the sequence is at s-2.
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*/
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if (LEAF_CCC(trie) == DECOMPOSE && LEAF_STR(trie)[0] == HANGUL)
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trie = utf8hangul(s - 2, hangul);
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return trie;
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}
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/*
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* Use trie to scan s.
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* Returns the leaf if one exists, NULL otherwise.
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*
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* Forwards to utf8nlookup().
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*/
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static utf8leaf_t *utf8lookup(const struct unicode_map *um,
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enum utf8_normalization n, unsigned char *hangul, const char *s)
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{
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return utf8nlookup(um, n, hangul, s, (size_t)-1);
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}
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/*
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* Length of the normalization of s, touch at most len bytes.
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* Return -1 if s is not valid UTF-8 unicode.
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*/
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ssize_t utf8nlen(const struct unicode_map *um, enum utf8_normalization n,
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const char *s, size_t len)
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{
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utf8leaf_t *leaf;
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size_t ret = 0;
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unsigned char hangul[UTF8HANGULLEAF];
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while (len && *s) {
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leaf = utf8nlookup(um, n, hangul, s, len);
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if (!leaf)
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return -1;
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if (um->tables->utf8agetab[LEAF_GEN(leaf)] >
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um->ntab[n]->maxage)
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ret += utf8clen(s);
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else if (LEAF_CCC(leaf) == DECOMPOSE)
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ret += strlen(LEAF_STR(leaf));
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else
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ret += utf8clen(s);
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len -= utf8clen(s);
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s += utf8clen(s);
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}
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return ret;
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}
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/*
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* Set up an utf8cursor for use by utf8byte().
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*
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* u8c : pointer to cursor.
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* data : const struct utf8data to use for normalization.
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* s : string.
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* len : length of s.
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*
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* Returns -1 on error, 0 on success.
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*/
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int utf8ncursor(struct utf8cursor *u8c, const struct unicode_map *um,
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enum utf8_normalization n, const char *s, size_t len)
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{
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if (!s)
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return -1;
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u8c->um = um;
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u8c->n = n;
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u8c->s = s;
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u8c->p = NULL;
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u8c->ss = NULL;
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u8c->sp = NULL;
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u8c->len = len;
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u8c->slen = 0;
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u8c->ccc = STOPPER;
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u8c->nccc = STOPPER;
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/* Check we didn't clobber the maximum length. */
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if (u8c->len != len)
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return -1;
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/* The first byte of s may not be an utf8 continuation. */
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if (len > 0 && (*s & 0xC0) == 0x80)
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return -1;
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return 0;
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}
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/*
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* Get one byte from the normalized form of the string described by u8c.
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*
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* Returns the byte cast to an unsigned char on succes, and -1 on failure.
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*
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* The cursor keeps track of the location in the string in u8c->s.
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* When a character is decomposed, the current location is stored in
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* u8c->p, and u8c->s is set to the start of the decomposition. Note
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* that bytes from a decomposition do not count against u8c->len.
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*
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* Characters are emitted if they match the current CCC in u8c->ccc.
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* Hitting end-of-string while u8c->ccc == STOPPER means we're done,
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* and the function returns 0 in that case.
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*
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* Sorting by CCC is done by repeatedly scanning the string. The
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* values of u8c->s and u8c->p are stored in u8c->ss and u8c->sp at
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* the start of the scan. The first pass finds the lowest CCC to be
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* emitted and stores it in u8c->nccc, the second pass emits the
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* characters with this CCC and finds the next lowest CCC. This limits
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* the number of passes to 1 + the number of different CCCs in the
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* sequence being scanned.
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*
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* Therefore:
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* u8c->p != NULL -> a decomposition is being scanned.
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* u8c->ss != NULL -> this is a repeating scan.
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* u8c->ccc == -1 -> this is the first scan of a repeating scan.
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*/
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int utf8byte(struct utf8cursor *u8c)
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{
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utf8leaf_t *leaf;
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int ccc;
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for (;;) {
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/* Check for the end of a decomposed character. */
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if (u8c->p && *u8c->s == '\0') {
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u8c->s = u8c->p;
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u8c->p = NULL;
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}
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/* Check for end-of-string. */
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if (!u8c->p && (u8c->len == 0 || *u8c->s == '\0')) {
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/* There is no next byte. */
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if (u8c->ccc == STOPPER)
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return 0;
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/* End-of-string during a scan counts as a stopper. */
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ccc = STOPPER;
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goto ccc_mismatch;
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} else if ((*u8c->s & 0xC0) == 0x80) {
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/* This is a continuation of the current character. */
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if (!u8c->p)
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u8c->len--;
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return (unsigned char)*u8c->s++;
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}
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/* Look up the data for the current character. */
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if (u8c->p) {
|
|
leaf = utf8lookup(u8c->um, u8c->n, u8c->hangul, u8c->s);
|
|
} else {
|
|
leaf = utf8nlookup(u8c->um, u8c->n, u8c->hangul,
|
|
u8c->s, u8c->len);
|
|
}
|
|
|
|
/* No leaf found implies that the input is a binary blob. */
|
|
if (!leaf)
|
|
return -1;
|
|
|
|
ccc = LEAF_CCC(leaf);
|
|
/* Characters that are too new have CCC 0. */
|
|
if (u8c->um->tables->utf8agetab[LEAF_GEN(leaf)] >
|
|
u8c->um->ntab[u8c->n]->maxage) {
|
|
ccc = STOPPER;
|
|
} else if (ccc == DECOMPOSE) {
|
|
u8c->len -= utf8clen(u8c->s);
|
|
u8c->p = u8c->s + utf8clen(u8c->s);
|
|
u8c->s = LEAF_STR(leaf);
|
|
/* Empty decomposition implies CCC 0. */
|
|
if (*u8c->s == '\0') {
|
|
if (u8c->ccc == STOPPER)
|
|
continue;
|
|
ccc = STOPPER;
|
|
goto ccc_mismatch;
|
|
}
|
|
|
|
leaf = utf8lookup(u8c->um, u8c->n, u8c->hangul, u8c->s);
|
|
if (!leaf)
|
|
return -1;
|
|
ccc = LEAF_CCC(leaf);
|
|
}
|
|
|
|
/*
|
|
* If this is not a stopper, then see if it updates
|
|
* the next canonical class to be emitted.
|
|
*/
|
|
if (ccc != STOPPER && u8c->ccc < ccc && ccc < u8c->nccc)
|
|
u8c->nccc = ccc;
|
|
|
|
/*
|
|
* Return the current byte if this is the current
|
|
* combining class.
|
|
*/
|
|
if (ccc == u8c->ccc) {
|
|
if (!u8c->p)
|
|
u8c->len--;
|
|
return (unsigned char)*u8c->s++;
|
|
}
|
|
|
|
/* Current combining class mismatch. */
|
|
ccc_mismatch:
|
|
if (u8c->nccc == STOPPER) {
|
|
/*
|
|
* Scan forward for the first canonical class
|
|
* to be emitted. Save the position from
|
|
* which to restart.
|
|
*/
|
|
u8c->ccc = MINCCC - 1;
|
|
u8c->nccc = ccc;
|
|
u8c->sp = u8c->p;
|
|
u8c->ss = u8c->s;
|
|
u8c->slen = u8c->len;
|
|
if (!u8c->p)
|
|
u8c->len -= utf8clen(u8c->s);
|
|
u8c->s += utf8clen(u8c->s);
|
|
} else if (ccc != STOPPER) {
|
|
/* Not a stopper, and not the ccc we're emitting. */
|
|
if (!u8c->p)
|
|
u8c->len -= utf8clen(u8c->s);
|
|
u8c->s += utf8clen(u8c->s);
|
|
} else if (u8c->nccc != MAXCCC + 1) {
|
|
/* At a stopper, restart for next ccc. */
|
|
u8c->ccc = u8c->nccc;
|
|
u8c->nccc = MAXCCC + 1;
|
|
u8c->s = u8c->ss;
|
|
u8c->p = u8c->sp;
|
|
u8c->len = u8c->slen;
|
|
} else {
|
|
/* All done, proceed from here. */
|
|
u8c->ccc = STOPPER;
|
|
u8c->nccc = STOPPER;
|
|
u8c->sp = NULL;
|
|
u8c->ss = NULL;
|
|
u8c->slen = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_UNICODE_NORMALIZATION_SELFTEST_MODULE
|
|
EXPORT_SYMBOL_GPL(utf8version_is_supported);
|
|
EXPORT_SYMBOL_GPL(utf8nlen);
|
|
EXPORT_SYMBOL_GPL(utf8ncursor);
|
|
EXPORT_SYMBOL_GPL(utf8byte);
|
|
#endif
|