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unicode: reduce the size of utf8data[] 

Remove the Hangul decompositions from the utf8data trie, and do
algorithmic decomposition to calculate them on the fly. To store the
decomposition the caller of utf8lookup()/utf8nlookup() must provide a
12-byte buffer, which is used to synthesize a leaf with the
decomposition. This significantly reduces the size of the utf8data[]
array.

Changes made by Gabriel:
  Rebase to mainline
  Fix checkpatch errors
  Extract robustness fixes and merge back to original mkutf8data.c patch
  Regenerate utf8data.h

Signed-off-by: Olaf Weber <olaf@sgi.com>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Olaf Weber 2019-04-25 13:49:18 -04:00 committed by Theodore Ts'o
parent 44594c2fbf
commit a8384c6879
5 changed files with 3296 additions and 12685 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/unicode/README.utf8data
View File

@ -46,8 +46,8 @@ cd to this directory (fs/unicode) and run this command:
make C=../.. objdir=../.. utf8data.h.new
After sanity checking the newly generated utf8data.h.new file (the
version generated from the 11.0.0 UCD should be 13,834 lines long, and
have a total size of 1104k) and/or comparing it with the older version
version generated from the 11.0.0 UCD should be 4,061 lines long, and
have a total size of 320k) and/or comparing it with the older version
of utf8data.h, rename it to utf8data.h.
If you are a kernel developer updating to a newer version of the

191
fs/unicode/utf8-norm.c
View File

@ -98,6 +98,38 @@ static inline int utf8clen(const char *s)
return 1 + (c >= 0xC0) + (c >= 0xE0) + (c >= 0xF0);
}
/*
* Decode a 3-byte UTF-8 sequence.
*/
static unsigned int
utf8decode3(const char *str)
{
unsigned int uc;
uc = *str++ & 0x0F;
uc <<= 6;
uc |= *str++ & 0x3F;
uc <<= 6;
uc |= *str++ & 0x3F;
return uc;
}
/*
* Encode a 3-byte UTF-8 sequence.
*/
static int
utf8encode3(char *str, unsigned int val)
{
str[2] = (val & 0x3F) | 0x80;
val >>= 6;
str[1] = (val & 0x3F) | 0x80;
val >>= 6;
str[0] = val | 0xE0;
return 3;
}
/*
* utf8trie_t
*
@ -159,7 +191,8 @@ typedef const unsigned char utf8trie_t;
* characters with the Default_Ignorable_Code_Point property.
* These do affect normalization, as they all have CCC 0.
*
* The decompositions in the trie have been fully expanded.
* The decompositions in the trie have been fully expanded, with the
* exception of Hangul syllables, which are decomposed algorithmically.
*
* Casefolding, if applicable, is also done using decompositions.
*
@ -179,6 +212,105 @@ typedef const unsigned char utf8leaf_t;
#define STOPPER (0)
#define DECOMPOSE (255)
/* Marker for hangul syllable decomposition. */
#define HANGUL ((char)(255))
/* Size of the synthesized leaf used for Hangul syllable decomposition. */
#define UTF8HANGULLEAF (12)
/*
* Hangul decomposition (algorithm from Section 3.12 of Unicode 6.3.0)
*
* AC00;<Hangul Syllable, First>;Lo;0;L;;;;;N;;;;;
* D7A3;<Hangul Syllable, Last>;Lo;0;L;;;;;N;;;;;
*
* SBase = 0xAC00
* LBase = 0x1100
* VBase = 0x1161
* TBase = 0x11A7
* LCount = 19
* VCount = 21
* TCount = 28
* NCount = 588 (VCount * TCount)
* SCount = 11172 (LCount * NCount)
*
* Decomposition:
* SIndex = s - SBase
*
* LV (Canonical/Full)
* LIndex = SIndex / NCount
* VIndex = (Sindex % NCount) / TCount
* LPart = LBase + LIndex
* VPart = VBase + VIndex
*
* LVT (Canonical)
* LVIndex = (SIndex / TCount) * TCount
* TIndex = (Sindex % TCount)
* LVPart = SBase + LVIndex
* TPart = TBase + TIndex
*
* LVT (Full)
* LIndex = SIndex / NCount
* VIndex = (Sindex % NCount) / TCount
* TIndex = (Sindex % TCount)
* LPart = LBase + LIndex
* VPart = VBase + VIndex
* if (TIndex == 0) {
* d = <LPart, VPart>
* } else {
* TPart = TBase + TIndex
* d = <LPart, TPart, VPart>
* }
*/
/* Constants */
#define SB (0xAC00)
#define LB (0x1100)
#define VB (0x1161)
#define TB (0x11A7)
#define LC (19)
#define VC (21)
#define TC (28)
#define NC (VC * TC)
#define SC (LC * NC)
/* Algorithmic decomposition of hangul syllable. */
static utf8leaf_t *
utf8hangul(const char *str, unsigned char *hangul)
{
unsigned int si;
unsigned int li;
unsigned int vi;
unsigned int ti;
unsigned char *h;
/* Calculate the SI, LI, VI, and TI values. */
si = utf8decode3(str) - SB;
li = si / NC;
vi = (si % NC) / TC;
ti = si % TC;
/* Fill in base of leaf. */
h = hangul;
LEAF_GEN(h) = 2;
LEAF_CCC(h) = DECOMPOSE;
h += 2;
/* Add LPart, a 3-byte UTF-8 sequence. */
h += utf8encode3((char *)h, li + LB);
/* Add VPart, a 3-byte UTF-8 sequence. */
h += utf8encode3((char *)h, vi + VB);
/* Add TPart if required, also a 3-byte UTF-8 sequence. */
if (ti)
h += utf8encode3((char *)h, ti + TB);
/* Terminate string. */
h[0] = '\0';
return hangul;
}
/*
* Use trie to scan s, touching at most len bytes.
* Returns the leaf if one exists, NULL otherwise.
@ -187,8 +319,8 @@ typedef const unsigned char utf8leaf_t;
* is well-formed and corresponds to a known unicode code point. The
* shorthand for this will be "is valid UTF-8 unicode".
*/
static utf8leaf_t *utf8nlookup(const struct utf8data *data, const char *s,
size_t len)
static utf8leaf_t *utf8nlookup(const struct utf8data *data,
unsigned char *hangul, const char *s, size_t len)
{
utf8trie_t *trie = NULL;
int offlen;
@ -228,8 +360,7 @@ static utf8leaf_t *utf8nlookup(const struct utf8data *data, const char *s,
trie++;
} else {
/* No right node. */
node = 0;
trie = NULL;
return NULL;
}
} else {
/* Left leg */
@ -239,8 +370,7 @@ static utf8leaf_t *utf8nlookup(const struct utf8data *data, const char *s,
trie += offlen + 1;
} else if (*trie & RIGHTPATH) {
/* No left node. */
node = 0;
trie = NULL;
return NULL;
} else {
/* Left node after this node */
node = (*trie & TRIENODE);
@ -248,6 +378,14 @@ static utf8leaf_t *utf8nlookup(const struct utf8data *data, const char *s,
}
}
}
/*
* Hangul decomposition is done algorithmically. These are the
* codepoints >= 0xAC00 and <= 0xD7A3. Their UTF-8 encoding is
* always 3 bytes long, so s has been advanced twice, and the
* start of the sequence is at s-2.
*/
if (LEAF_CCC(trie) == DECOMPOSE && LEAF_STR(trie)[0] == HANGUL)
trie = utf8hangul(s - 2, hangul);
return trie;
}
@ -257,9 +395,10 @@ static utf8leaf_t *utf8nlookup(const struct utf8data *data, const char *s,
*
* Forwards to utf8nlookup().
*/
static utf8leaf_t *utf8lookup(const struct utf8data *data, const char *s)
static utf8leaf_t *utf8lookup(const struct utf8data *data,
unsigned char *hangul, const char *s)
{
return utf8nlookup(data, s, (size_t)-1);
return utf8nlookup(data, hangul, s, (size_t)-1);
}
/*
@ -272,11 +411,13 @@ int utf8agemax(const struct utf8data *data, const char *s)
utf8leaf_t *leaf;
int age = 0;
int leaf_age;
unsigned char hangul[UTF8HANGULLEAF];
if (!data)
return -1;
while (*s) {
leaf = utf8lookup(data, s);
leaf = utf8lookup(data, hangul, s);
if (!leaf)
return -1;
@ -299,12 +440,13 @@ int utf8agemin(const struct utf8data *data, const char *s)
utf8leaf_t *leaf;
int age;
int leaf_age;
unsigned char hangul[UTF8HANGULLEAF];
if (!data)
return -1;
age = data->maxage;
while (*s) {
leaf = utf8lookup(data, s);
leaf = utf8lookup(data, hangul, s);
if (!leaf)
return -1;
leaf_age = utf8agetab[LEAF_GEN(leaf)];
@ -325,11 +467,13 @@ int utf8nagemax(const struct utf8data *data, const char *s, size_t len)
utf8leaf_t *leaf;
int age = 0;
int leaf_age;
unsigned char hangul[UTF8HANGULLEAF];
if (!data)
return -1;
while (len && *s) {
leaf = utf8nlookup(data, s, len);
leaf = utf8nlookup(data, hangul, s, len);
if (!leaf)
return -1;
leaf_age = utf8agetab[LEAF_GEN(leaf)];
@ -351,12 +495,13 @@ int utf8nagemin(const struct utf8data *data, const char *s, size_t len)
utf8leaf_t *leaf;
int leaf_age;
int age;
unsigned char hangul[UTF8HANGULLEAF];
if (!data)
return -1;
age = data->maxage;
while (len && *s) {
leaf = utf8nlookup(data, s, len);
leaf = utf8nlookup(data, hangul, s, len);
if (!leaf)
return -1;
leaf_age = utf8agetab[LEAF_GEN(leaf)];
@ -379,11 +524,12 @@ ssize_t utf8len(const struct utf8data *data, const char *s)
{
utf8leaf_t *leaf;
size_t ret = 0;
unsigned char hangul[UTF8HANGULLEAF];
if (!data)
return -1;
while (*s) {
leaf = utf8lookup(data, s);
leaf = utf8lookup(data, hangul, s);
if (!leaf)
return -1;
if (utf8agetab[LEAF_GEN(leaf)] > data->maxage)
@ -406,11 +552,12 @@ ssize_t utf8nlen(const struct utf8data *data, const char *s, size_t len)
{
utf8leaf_t *leaf;
size_t ret = 0;
unsigned char hangul[UTF8HANGULLEAF];
if (!data)
return -1;
while (len && *s) {
leaf = utf8nlookup(data, s, len);
leaf = utf8nlookup(data, hangul, s, len);
if (!leaf)
return -1;
if (utf8agetab[LEAF_GEN(leaf)] > data->maxage)
@ -533,10 +680,12 @@ int utf8byte(struct utf8cursor *u8c)
}
/* Look up the data for the current character. */
if (u8c->p)
leaf = utf8lookup(u8c->data, u8c->s);
else
leaf = utf8nlookup(u8c->data, u8c->s, u8c->len);
if (u8c->p) {
leaf = utf8lookup(u8c->data, u8c->hangul, u8c->s);
} else {
leaf = utf8nlookup(u8c->data, u8c->hangul,
u8c->s, u8c->len);
}
/* No leaf found implies that the input is a binary blob. */
if (!leaf)
@ -557,7 +706,9 @@ int utf8byte(struct utf8cursor *u8c)
ccc = STOPPER;
goto ccc_mismatch;
}
leaf = utf8lookup(u8c->data, u8c->s);
leaf = utf8lookup(u8c->data, u8c->hangul, u8c->s);
ccc = LEAF_CCC(leaf);
}
/*

15475
fs/unicode/utf8data.h
View File

File diff suppressed because it is too large Load Diff

4
fs/unicode/utf8n.h
View File

@ -76,6 +76,9 @@ extern int utf8nagemin(const struct utf8data *data, const char *s, size_t len);
extern ssize_t utf8len(const struct utf8data *data, const char *s);
extern ssize_t utf8nlen(const struct utf8data *data, const char *s, size_t len);
/* Needed in struct utf8cursor below. */
#define UTF8HANGULLEAF (12)
/*
* Cursor structure used by the normalizer.
*/
@ -89,6 +92,7 @@ struct utf8cursor {
unsigned int slen;
short int ccc;
short int nccc;
unsigned char hangul[UTF8HANGULLEAF];
};
/*

307
scripts/mkutf8data.c
View File

@ -182,10 +182,14 @@ typedef unsigned char utf8leaf_t;
#define MAXCCC (254)
#define STOPPER (0)
#define DECOMPOSE (255)
#define HANGUL ((char)(255))
#define UTF8HANGULLEAF (12)
struct tree;
static utf8leaf_t *utf8nlookup(struct tree *, const char *, size_t);
static utf8leaf_t *utf8lookup(struct tree *, const char *);
static utf8leaf_t *utf8nlookup(struct tree *, unsigned char *,
const char *, size_t);
static utf8leaf_t *utf8lookup(struct tree *, unsigned char *, const char *);
unsigned char *utf8data;
size_t utf8data_size;
@ -333,6 +337,8 @@ static int utf32valid(unsigned int unichar)
return unichar < 0x110000;
}
#define HANGUL_SYLLABLE(U) ((U) >= 0xAC00 && (U) <= 0xD7A3)
#define NODE 1
#define LEAF 0
@ -463,7 +469,7 @@ static void tree_walk(struct tree *tree)
indent+1);
leaves += 1;
} else if (node->right) {
assert(node->rightnode==NODE);
assert(node->rightnode == NODE);
indent += 1;
node = node->right;
break;
@ -857,7 +863,7 @@ static void mark_nodes(struct tree *tree)
}
}
} else if (node->right) {
assert(node->rightnode==NODE);
assert(node->rightnode == NODE);
node = node->right;
continue;
}
@ -909,7 +915,7 @@ static void mark_nodes(struct tree *tree)
}
}
} else if (node->right) {
assert(node->rightnode==NODE);
assert(node->rightnode == NODE);
node = node->right;
if (!node->mark && node->parent->mark &&
!node->parent->left) {
@ -992,7 +998,7 @@ skip:
index += tree->leaf_size(node->right);
count++;
} else if (node->right) {
assert(node->rightnode==NODE);
assert(node->rightnode == NODE);
indent += 1;
node = node->right;
break;
@ -1013,6 +1019,25 @@ done:
return index;
}
/*
* Mark the nodes in a subtree, helper for size_nodes().
*/
static int mark_subtree(struct node *node)
{
int changed;
if (!node || node->mark)
return 0;
node->mark = 1;
node->index = node->parent->index;
changed = 1;
if (node->leftnode == NODE)
changed += mark_subtree(node->left);
if (node->rightnode == NODE)
changed += mark_subtree(node->right);
return changed;
}
/*
* Compute the size of nodes and leaves. We start by assuming that
* each node needs to store a three-byte offset. The indexes of the
@ -1031,6 +1056,7 @@ static int size_nodes(struct tree *tree)
unsigned int bitmask;
unsigned int pathbits;
unsigned int pathmask;
unsigned int nbit;
int changed;
int offset;
int size;
@ -1058,22 +1084,40 @@ static int size_nodes(struct tree *tree)
size = 1;
} else {
if (node->rightnode == NODE) {
/*
* If the right node is not marked,
* look for a corresponding node in
* the next tree. Such a node need
* not exist.
*/
right = node->right;
next = tree->next;
while (!right->mark) {
assert(next);
n = next->root;
while (n->bitnum != node->bitnum) {
if (pathbits & (1<<n->bitnum))
nbit = 1 << n->bitnum;
if (!(pathmask & nbit))
break;
if (pathbits & nbit) {
if (n->rightnode == LEAF)
break;
n = n->right;
else
} else {
if (n->leftnode == LEAF)
break;
n = n->left;
}
}
if (n->bitnum != node->bitnum)
break;
n = n->right;
assert(right->bitnum == n->bitnum);
right = n;
next = next->next;
}
/* Make sure the right node is marked. */
if (!right->mark)
changed += mark_subtree(right);
offset = right->index - node->index;
} else {
offset = *tree->leaf_index(tree, node->right);
@ -1115,7 +1159,7 @@ skip:
if (node->rightnode == LEAF) {
assert(node->right);
} else if (node->right) {
assert(node->rightnode==NODE);
assert(node->rightnode == NODE);
indent += 1;
node = node->right;
break;
@ -1148,8 +1192,15 @@ static void emit(struct tree *tree, unsigned char *data)
int offset;
int index;
int indent;
int size;
int bytes;
int leaves;
int nodes[4];
unsigned char byte;
nodes[0] = nodes[1] = nodes[2] = nodes[3] = 0;
leaves = 0;
bytes = 0;
index = tree->index;
data += index;
indent = 1;
@ -1158,7 +1209,10 @@ static void emit(struct tree *tree, unsigned char *data)
if (tree->childnode == LEAF) {
assert(tree->root);
tree->leaf_emit(tree->root, data);
return;
size = tree->leaf_size(tree->root);
index += size;
leaves++;
goto done;
}
assert(tree->childnode == NODE);
@ -1185,6 +1239,7 @@ static void emit(struct tree *tree, unsigned char *data)
offlen = 2;
else
offlen = 3;
nodes[offlen]++;
offset = node->offset;
byte |= offlen << OFFLEN_SHIFT;
*data++ = byte;
@ -1197,12 +1252,14 @@ static void emit(struct tree *tree, unsigned char *data)
} else if (node->left) {
if (node->leftnode == NODE)
byte |= TRIENODE;
nodes[0]++;
*data++ = byte;
index++;
} else if (node->right) {
byte |= RIGHTNODE;
if (node->rightnode == NODE)
byte |= TRIENODE;
nodes[0]++;
*data++ = byte;
index++;
} else {
@ -1217,7 +1274,10 @@ skip:
assert(node->left);
data = tree->leaf_emit(node->left,
data);
index += tree->leaf_size(node->left);
size = tree->leaf_size(node->left);
index += size;
bytes += size;
leaves++;
} else if (node->left) {
assert(node->leftnode == NODE);
indent += 1;
@ -1231,9 +1291,12 @@ skip:
assert(node->right);
data = tree->leaf_emit(node->right,
data);
index += tree->leaf_size(node->right);
size = tree->leaf_size(node->right);
index += size;
bytes += size;
leaves++;
} else if (node->right) {
assert(node->rightnode==NODE);
assert(node->rightnode == NODE);
indent += 1;
node = node->right;
break;
@ -1245,6 +1308,15 @@ skip:
indent -= 1;
}
}
done:
if (verbose > 0) {
printf("Emitted %d (%d) leaves",
leaves, bytes);
printf(" %d (%d+%d+%d+%d) nodes",
nodes[0] + nodes[1] + nodes[2] + nodes[3],
nodes[0], nodes[1], nodes[2], nodes[3]);
printf(" %d total\n", index - tree->index);
}
}
/* ------------------------------------------------------------------ */
@ -1346,8 +1418,12 @@ static void nfdi_print(void *l, int indent)
printf("%*sleaf @ %p code %X ccc %d gen %d", indent, "", leaf,
leaf->code, leaf->ccc, leaf->gen);
if (leaf->utf8nfdi)
if (leaf->utf8nfdi && leaf->utf8nfdi[0] == HANGUL)
printf(" nfdi \"%s\"", "HANGUL SYLLABLE");
else if (leaf->utf8nfdi)
printf(" nfdi \"%s\"", (const char*)leaf->utf8nfdi);
printf("\n");
}
@ -1357,8 +1433,11 @@ static void nfdicf_print(void *l, int indent)
printf("%*sleaf @ %p code %X ccc %d gen %d", indent, "", leaf,
leaf->code, leaf->ccc, leaf->gen);
if (leaf->utf8nfdicf)
printf(" nfdicf \"%s\"", (const char*)leaf->utf8nfdicf);
else if (leaf->utf8nfdi && leaf->utf8nfdi[0] == HANGUL)
printf(" nfdi \"%s\"", "HANGUL SYLLABLE");
else if (leaf->utf8nfdi)
printf(" nfdi \"%s\"", (const char*)leaf->utf8nfdi);
printf("\n");
@ -1388,9 +1467,11 @@ static int correction_mark(void *l)
static int nfdi_size(void *l)
{
struct unicode_data *leaf = l;
int size = 2;
if (leaf->utf8nfdi)
if (HANGUL_SYLLABLE(leaf->code))
size += 1;
else if (leaf->utf8nfdi)
size += strlen(leaf->utf8nfdi) + 1;
return size;
}
@ -1398,9 +1479,11 @@ static int nfdi_size(void *l)
static int nfdicf_size(void *l)
{
struct unicode_data *leaf = l;
int size = 2;
if (leaf->utf8nfdicf)
if (HANGUL_SYLLABLE(leaf->code))
size += 1;
else if (leaf->utf8nfdicf)
size += strlen(leaf->utf8nfdicf) + 1;
else if (leaf->utf8nfdi)
size += strlen(leaf->utf8nfdi) + 1;
@ -1427,7 +1510,11 @@ static unsigned char *nfdi_emit(void *l, unsigned char *data)
unsigned char *s;
*data++ = leaf->gen;
if (leaf->utf8nfdi) {
if (HANGUL_SYLLABLE(leaf->code)) {
*data++ = DECOMPOSE;
*data++ = HANGUL;
} else if (leaf->utf8nfdi) {
*data++ = DECOMPOSE;
s = (unsigned char*)leaf->utf8nfdi;
while ((*data++ = *s++) != 0)
@ -1444,7 +1531,11 @@ static unsigned char *nfdicf_emit(void *l, unsigned char *data)
unsigned char *s;
*data++ = leaf->gen;
if (leaf->utf8nfdicf) {
if (HANGUL_SYLLABLE(leaf->code)) {
*data++ = DECOMPOSE;
*data++ = HANGUL;
} else if (leaf->utf8nfdicf) {
*data++ = DECOMPOSE;
s = (unsigned char*)leaf->utf8nfdicf;
while ((*data++ = *s++) != 0)
@ -1467,6 +1558,11 @@ static void utf8_create(struct unicode_data *data)
unsigned int *um;
int i;
if (data->utf8nfdi) {
assert(data->utf8nfdi[0] == HANGUL);
return;
}
u = utf;
um = data->utf32nfdi;
if (um) {
@ -1652,6 +1748,7 @@ static void verify(struct tree *tree)
utf8leaf_t *leaf;
unsigned int unichar;
char key[4];
unsigned char hangul[UTF8HANGULLEAF];
int report;
int nocf;
@ -1665,7 +1762,8 @@ static void verify(struct tree *tree)
if (data->correction <= tree->maxage)
data = &unicode_data[unichar];
utf8encode(key,unichar);
leaf = utf8lookup(tree, key);
leaf = utf8lookup(tree, hangul, key);
if (!leaf) {
if (data->gen != -1)
report++;
@ -1679,7 +1777,10 @@ static void verify(struct tree *tree)
if (data->gen != LEAF_GEN(leaf))
report++;
if (LEAF_CCC(leaf) == DECOMPOSE) {
if (nocf) {
if (HANGUL_SYLLABLE(data->code)) {
if (data->utf8nfdi[0] != HANGUL)
report++;
} else if (nocf) {
if (!data->utf8nfdi) {
report++;
} else if (strcmp(data->utf8nfdi,
@ -2323,8 +2424,7 @@ static void corrections_init(void)
*
*/
static void
hangul_decompose(void)
static void hangul_decompose(void)
{
unsigned int sb = 0xAC00;
unsigned int lb = 0x1100;
@ -2368,6 +2468,15 @@ hangul_decompose(void)
memcpy(um, mapping, i * sizeof(unsigned int));
unicode_data[unichar].utf32nfdicf = um;
/*
* Add a cookie as a reminder that the hangul syllable
* decompositions must not be stored in the generated
* trie.
*/
unicode_data[unichar].utf8nfdi = malloc(2);
unicode_data[unichar].utf8nfdi[0] = HANGUL;
unicode_data[unichar].utf8nfdi[1] = '\0';
if (verbose > 1)
print_utf32nfdi(unichar);
@ -2493,6 +2602,99 @@ int utf8cursor(struct utf8cursor *, struct tree *, const char *);
int utf8ncursor(struct utf8cursor *, struct tree *, const char *, size_t);
int utf8byte(struct utf8cursor *);
/*
* Hangul decomposition (algorithm from Section 3.12 of Unicode 6.3.0)
*
* AC00;<Hangul Syllable, First>;Lo;0;L;;;;;N;;;;;
* D7A3;<Hangul Syllable, Last>;Lo;0;L;;;;;N;;;;;
*
* SBase = 0xAC00
* LBase = 0x1100
* VBase = 0x1161
* TBase = 0x11A7
* LCount = 19
* VCount = 21
* TCount = 28
* NCount = 588 (VCount * TCount)
* SCount = 11172 (LCount * NCount)
*
* Decomposition:
* SIndex = s - SBase
*
* LV (Canonical/Full)
* LIndex = SIndex / NCount
* VIndex = (Sindex % NCount) / TCount
* LPart = LBase + LIndex
* VPart = VBase + VIndex
*
* LVT (Canonical)
* LVIndex = (SIndex / TCount) * TCount
* TIndex = (Sindex % TCount)
* LVPart = SBase + LVIndex
* TPart = TBase + TIndex
*
* LVT (Full)
* LIndex = SIndex / NCount
* VIndex = (Sindex % NCount) / TCount
* TIndex = (Sindex % TCount)
* LPart = LBase + LIndex
* VPart = VBase + VIndex
* if (TIndex == 0) {
* d = <LPart, VPart>
* } else {
* TPart = TBase + TIndex
* d = <LPart, VPart, TPart>
* }
*/
/* Constants */
#define SB (0xAC00)
#define LB (0x1100)
#define VB (0x1161)
#define TB (0x11A7)
#define LC (19)
#define VC (21)
#define TC (28)
#define NC (VC * TC)
#define SC (LC * NC)
/* Algorithmic decomposition of hangul syllable. */
static utf8leaf_t *utf8hangul(const char *str, unsigned char *hangul)
{
unsigned int si;
unsigned int li;
unsigned int vi;
unsigned int ti;
unsigned char *h;
/* Calculate the SI, LI, VI, and TI values. */
si = utf8decode(str) - SB;
li = si / NC;
vi = (si % NC) / TC;
ti = si % TC;
/* Fill in base of leaf. */
h = hangul;
LEAF_GEN(h) = 2;
LEAF_CCC(h) = DECOMPOSE;
h += 2;
/* Add LPart, a 3-byte UTF-8 sequence. */
h += utf8encode((char *)h, li + LB);
/* Add VPart, a 3-byte UTF-8 sequence. */
h += utf8encode((char *)h, vi + VB);
/* Add TPart if required, also a 3-byte UTF-8 sequence. */
if (ti)
h += utf8encode((char *)h, ti + TB);
/* Terminate string. */
h[0] = '\0';
return hangul;
}
/*
* Use trie to scan s, touching at most len bytes.
* Returns the leaf if one exists, NULL otherwise.
@ -2501,7 +2703,8 @@ int utf8byte(struct utf8cursor *);
* is well-formed and corresponds to a known unicode code point. The
* shorthand for this will be "is valid UTF-8 unicode".
*/
static utf8leaf_t *utf8nlookup(struct tree *tree, const char *s, size_t len)
static utf8leaf_t *utf8nlookup(struct tree *tree, unsigned char *hangul,
const char *s, size_t len)
{
utf8trie_t *trie;
int offlen;
@ -2558,6 +2761,14 @@ static utf8leaf_t *utf8nlookup(struct tree *tree, const char *s, size_t len)
}
}
}
/*
* Hangul decomposition is done algorithmically. These are the
* codepoints >= 0xAC00 and <= 0xD7A3. Their UTF-8 encoding is
* always 3 bytes long, so s has been advanced twice, and the
* start of the sequence is at s-2.
*/
if (LEAF_CCC(trie) == DECOMPOSE && LEAF_STR(trie)[0] == HANGUL)
trie = utf8hangul(s - 2, hangul);
return trie;
}
@ -2567,9 +2778,10 @@ static utf8leaf_t *utf8nlookup(struct tree *tree, const char *s, size_t len)
*
* Forwards to trie_nlookup().
*/
static utf8leaf_t *utf8lookup(struct tree *tree, const char *s)
static utf8leaf_t *utf8lookup(struct tree *tree, unsigned char *hangul,
const char *s)
{
return utf8nlookup(tree, s, (size_t)-1);
return utf8nlookup(tree, hangul, s, (size_t)-1);
}
/*
@ -2593,11 +2805,14 @@ int utf8agemax(struct tree *tree, const char *s)
utf8leaf_t *leaf;
int age = 0;
int leaf_age;
unsigned char hangul[UTF8HANGULLEAF];
if (!tree)
return -1;
while (*s) {
if (!(leaf = utf8lookup(tree, s)))
leaf = utf8lookup(tree, hangul, s);
if (!leaf)
return -1;
leaf_age = ages[LEAF_GEN(leaf)];
if (leaf_age <= tree->maxage && leaf_age > age)
@ -2617,12 +2832,14 @@ int utf8agemin(struct tree *tree, const char *s)
utf8leaf_t *leaf;
int age;
int leaf_age;
unsigned char hangul[UTF8HANGULLEAF];
if (!tree)
return -1;
age = tree->maxage;
while (*s) {
if (!(leaf = utf8lookup(tree, s)))
leaf = utf8lookup(tree, hangul, s);
if (!leaf)
return -1;
leaf_age = ages[LEAF_GEN(leaf)];
if (leaf_age <= tree->maxage && leaf_age < age)
@ -2641,11 +2858,14 @@ int utf8nagemax(struct tree *tree, const char *s, size_t len)
utf8leaf_t *leaf;
int age = 0;
int leaf_age;
unsigned char hangul[UTF8HANGULLEAF];
if (!tree)
return -1;
while (len && *s) {
if (!(leaf = utf8nlookup(tree, s, len)))
leaf = utf8nlookup(tree, hangul, s, len);
if (!leaf)
return -1;
leaf_age = ages[LEAF_GEN(leaf)];
if (leaf_age <= tree->maxage && leaf_age > age)
@ -2665,12 +2885,14 @@ int utf8nagemin(struct tree *tree, const char *s, size_t len)
utf8leaf_t *leaf;
int leaf_age;
int age;
unsigned char hangul[UTF8HANGULLEAF];
if (!tree)
return -1;
age = tree->maxage;
while (len && *s) {
if (!(leaf = utf8nlookup(tree, s, len)))
leaf = utf8nlookup(tree, hangul, s, len);
if (!leaf)
return -1;
leaf_age = ages[LEAF_GEN(leaf)];
if (leaf_age <= tree->maxage && leaf_age < age)
@ -2691,11 +2913,13 @@ ssize_t utf8len(struct tree *tree, const char *s)
{
utf8leaf_t *leaf;
size_t ret = 0;
unsigned char hangul[UTF8HANGULLEAF];
if (!tree)
return -1;
while (*s) {
if (!(leaf = utf8lookup(tree, s)))
leaf = utf8lookup(tree, hangul, s);
if (!leaf)
return -1;
if (ages[LEAF_GEN(leaf)] > tree->maxage)
ret += utf8clen(s);
@ -2716,11 +2940,13 @@ ssize_t utf8nlen(struct tree *tree, const char *s, size_t len)
{
utf8leaf_t *leaf;
size_t ret = 0;
unsigned char hangul[UTF8HANGULLEAF];
if (!tree)
return -1;
while (len && *s) {
if (!(leaf = utf8nlookup(tree, s, len)))
leaf = utf8nlookup(tree, hangul, s, len);
if (!leaf)
return -1;
if (ages[LEAF_GEN(leaf)] > tree->maxage)
ret += utf8clen(s);
@ -2748,6 +2974,7 @@ struct utf8cursor {
short int ccc;
short int nccc;
unsigned int unichar;
unsigned char hangul[UTF8HANGULLEAF];
};
/*
@ -2855,10 +3082,12 @@ int utf8byte(struct utf8cursor *u8c)
}
/* Look up the data for the current character. */
if (u8c->p)
leaf = utf8lookup(u8c->tree, u8c->s);
else
leaf = utf8nlookup(u8c->tree, u8c->s, u8c->len);
if (u8c->p) {
leaf = utf8lookup(u8c->tree, u8c->hangul, u8c->s);
} else {
leaf = utf8nlookup(u8c->tree, u8c->hangul,
u8c->s, u8c->len);
}
/* No leaf found implies that the input is a binary blob. */
if (!leaf)
@ -2878,7 +3107,7 @@ int utf8byte(struct utf8cursor *u8c)
ccc = STOPPER;
goto ccc_mismatch;
}
leaf = utf8lookup(u8c->tree, u8c->s);
leaf = utf8lookup(u8c->tree, u8c->hangul, u8c->s);
ccc = LEAF_CCC(leaf);
}
u8c->unichar = utf8decode(u8c->s);