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Subject[PATCH v2 13/15] nls: utf8norm: reduce the size of utf8data[]
Date
From: Olaf Weber <olaf@sgi.com>

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. Trie size is reduced from 245kB to 90kB.

Signed-off-by: Olaf Weber <olaf@sgi.com>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
[Rebase to mainline]
[Fix checkpatch errors]
[Extract robustness fixes and merge back to original mkutf8data.c
patch]
---
fs/nls/nls_utf8n-norm.c | 191 +++++++++++++++++++++++---
fs/nls/utf8n.h | 4 +
scripts/mkutf8data.c | 295 +++++++++++++++++++++++++++++++++++-----
3 files changed, 435 insertions(+), 55 deletions(-)

diff --git a/fs/nls/nls_utf8n-norm.c b/fs/nls/nls_utf8n-norm.c
index ca0bbf644b49..64c3cc74a2ca 100644
--- a/fs/nls/nls_utf8n-norm.c
+++ b/fs/nls/nls_utf8n-norm.c
@@ -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 = utf8data + data->offset;
int offlen;
@@ -226,8 +358,7 @@ 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 */
@@ -237,8 +368,7 @@ 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);
@@ -246,6 +376,14 @@ 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;
}

@@ -255,9 +393,10 @@ 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);
}

/*
@@ -270,11 +409,13 @@ 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;

@@ -297,12 +438,13 @@ 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)];
@@ -323,11 +465,13 @@ 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)];
@@ -349,12 +493,13 @@ 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)];
@@ -377,11 +522,12 @@ 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)
@@ -404,11 +550,12 @@ 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)
@@ -531,10 +678,12 @@ 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)
@@ -555,7 +704,9 @@ 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);
}

/*
diff --git a/fs/nls/utf8n.h b/fs/nls/utf8n.h
index 0f5fc14d4fd2..f60827663503 100644
--- a/fs/nls/utf8n.h
+++ b/fs/nls/utf8n.h
@@ -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];
};

/*
diff --git a/scripts/mkutf8data.c b/scripts/mkutf8data.c
index 700b41c0cb66..69f3be92ba71 100644
--- a/scripts/mkutf8data.c
+++ b/scripts/mkutf8data.c
@@ -180,10 +180,14 @@ 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;
@@ -334,6 +338,8 @@ utf32valid(unsigned int unichar)
return unichar < 0x110000;
}

+#define HANGUL_SYLLABLE(U) ((U) >= 0xAC00 && (U) <= 0xD7A3)
+
#define NODE 1
#define LEAF 0

@@ -466,7 +472,7 @@ 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;
@@ -864,7 +870,7 @@ mark_nodes(struct tree *tree)
}
}
} else if (node->right) {
- assert(node->rightnode==NODE);
+ assert(node->rightnode == NODE);
node = node->right;
continue;
}
@@ -916,7 +922,7 @@ 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) {
@@ -1000,7 +1006,7 @@ index_nodes(struct tree *tree, int index)
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;
@@ -1021,6 +1027,26 @@ index_nodes(struct tree *tree, int index)
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
@@ -1040,6 +1066,7 @@ size_nodes(struct tree *tree)
unsigned int bitmask;
unsigned int pathbits;
unsigned int pathmask;
+ unsigned int nbit;
int changed;
int offset;
int size;
@@ -1067,22 +1094,40 @@ 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);
@@ -1124,7 +1169,7 @@ size_nodes(struct tree *tree)
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;
@@ -1158,8 +1203,15 @@ 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;
@@ -1168,7 +1220,10 @@ 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);
@@ -1195,6 +1250,7 @@ emit(struct tree *tree, unsigned char *data)
offlen = 2;
else
offlen = 3;
+ nodes[offlen]++;
offset = node->offset;
byte |= offlen << OFFLEN_SHIFT;
*data++ = byte;
@@ -1207,12 +1263,14 @@ 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 {
@@ -1227,7 +1285,10 @@ emit(struct tree *tree, unsigned char *data)
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;
@@ -1241,9 +1302,12 @@ emit(struct tree *tree, unsigned char *data)
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;
@@ -1255,6 +1319,15 @@ emit(struct tree *tree, unsigned char *data)
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);
+ }
}

/* ------------------------------------------------------------------ */
@@ -1360,7 +1433,9 @@ nfkdi_print(void *l, int indent)

printf("%*sleaf @ %p code %X ccc %d gen %d", indent, "", leaf,
leaf->code, leaf->ccc, leaf->gen);
- if (leaf->utf8nfkdi)
+ if (leaf->utf8nfkdi && leaf->utf8nfkdi[0] == HANGUL)
+ printf(" nfkdi \"%s\"", "HANGUL SYLLABLE");
+ else if (leaf->utf8nfkdi)
printf(" nfkdi \"%s\"", (const char*)leaf->utf8nfkdi);
printf("\n");
}
@@ -1374,6 +1449,8 @@ nfkdicf_print(void *l, int indent)
leaf->code, leaf->ccc, leaf->gen);
if (leaf->utf8nfkdicf)
printf(" nfkdicf \"%s\"", (const char*)leaf->utf8nfkdicf);
+ else if (leaf->utf8nfkdi && leaf->utf8nfkdi[0] == HANGUL)
+ printf(" nfkdi \"%s\"", "HANGUL SYLLABLE");
else if (leaf->utf8nfkdi)
printf(" nfkdi \"%s\"", (const char*)leaf->utf8nfkdi);
printf("\n");
@@ -1409,7 +1486,9 @@ nfkdi_size(void *l)
struct unicode_data *leaf = l;

int size = 2;
- if (leaf->utf8nfkdi)
+ if (HANGUL_SYLLABLE(leaf->code))
+ size += 1;
+ else if (leaf->utf8nfkdi)
size += strlen(leaf->utf8nfkdi) + 1;
return size;
}
@@ -1420,7 +1499,9 @@ nfkdicf_size(void *l)
struct unicode_data *leaf = l;

int size = 2;
- if (leaf->utf8nfkdicf)
+ if (HANGUL_SYLLABLE(leaf->code))
+ size += 1;
+ else if (leaf->utf8nfkdicf)
size += strlen(leaf->utf8nfkdicf) + 1;
else if (leaf->utf8nfkdi)
size += strlen(leaf->utf8nfkdi) + 1;
@@ -1450,7 +1531,10 @@ nfkdi_emit(void *l, unsigned char *data)
unsigned char *s;

*data++ = leaf->gen;
- if (leaf->utf8nfkdi) {
+ if (HANGUL_SYLLABLE(leaf->code)) {
+ *data++ = DECOMPOSE;
+ *data++ = HANGUL;
+ } else if (leaf->utf8nfkdi) {
*data++ = DECOMPOSE;
s = (unsigned char*)leaf->utf8nfkdi;
while ((*data++ = *s++) != 0)
@@ -1468,7 +1552,10 @@ nfkdicf_emit(void *l, unsigned char *data)
unsigned char *s;

*data++ = leaf->gen;
- if (leaf->utf8nfkdicf) {
+ if (HANGUL_SYLLABLE(leaf->code)) {
+ *data++ = DECOMPOSE;
+ *data++ = HANGUL;
+ } else if (leaf->utf8nfkdicf) {
*data++ = DECOMPOSE;
s = (unsigned char*)leaf->utf8nfkdicf;
while ((*data++ = *s++) != 0)
@@ -1492,6 +1579,11 @@ utf8_create(struct unicode_data *data)
unsigned int *um;
int i;

+ if (data->utf8nfkdi) {
+ assert(data->utf8nfkdi[0] == HANGUL);
+ return;
+ }
+
u = utf;
um = data->utf32nfkdi;
if (um) {
@@ -1682,6 +1774,7 @@ verify(struct tree *tree)
utf8leaf_t *leaf;
unsigned int unichar;
char key[4];
+ unsigned char hangul[UTF8HANGULLEAF];
int report;
int nocf;

@@ -1695,7 +1788,8 @@ 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++;
@@ -1709,7 +1803,10 @@ 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->utf8nfkdi[0] != HANGUL)
+ report++;
+ } else if (nocf) {
if (!data->utf8nfkdi) {
report++;
} else if (strcmp(data->utf8nfkdi,
@@ -2394,6 +2491,15 @@ hangul_decompose(void)
memcpy(um, mapping, i * sizeof(unsigned int));
unicode_data[unichar].utf32nfkdicf = um;

+ /*
+ * Add a cookie as a reminder that the hangul syllable
+ * decompositions must not be stored in the generated
+ * trie.
+ */
+ unicode_data[unichar].utf8nfkdi = malloc(2);
+ unicode_data[unichar].utf8nfkdi[0] = HANGUL;
+ unicode_data[unichar].utf8nfkdi[1] = '\0';
+
if (verbose > 1)
print_utf32nfkdi(unichar);

@@ -2521,6 +2627,100 @@ 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.
@@ -2530,7 +2730,7 @@ int utf8byte(struct utf8cursor *);
* shorthand for this will be "is valid UTF-8 unicode".
*/
static utf8leaf_t *
-utf8nlookup(struct tree *tree, const char *s, size_t len)
+utf8nlookup(struct tree *tree, unsigned char *hangul, const char *s, size_t len)
{
utf8trie_t *trie = utf8data + tree->index;
int offlen;
@@ -2586,6 +2786,14 @@ 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;
}

@@ -2596,9 +2804,9 @@ utf8nlookup(struct tree *tree, const char *s, size_t len)
* Forwards to trie_nlookup().
*/
static utf8leaf_t *
-utf8lookup(struct tree *tree, const char *s)
+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);
}

/*
@@ -2624,11 +2832,14 @@ 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)
@@ -2649,12 +2860,14 @@ 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)
@@ -2674,11 +2887,14 @@ 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)
@@ -2699,12 +2915,14 @@ 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)
@@ -2726,11 +2944,13 @@ 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);
@@ -2752,11 +2972,13 @@ 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);
@@ -2784,6 +3006,7 @@ struct utf8cursor {
short int ccc;
short int nccc;
unsigned int unichar;
+ unsigned char hangul[UTF8HANGULLEAF];
};

/*
@@ -2900,10 +3123,12 @@ 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)
@@ -2923,7 +3148,7 @@ 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);
--
2.17.0
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