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libunicode.c
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libunicode.c
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/*
* Unicode utilities
*
* Copyright (c) 2017-2018 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>
#include "cutils.h"
#include "libunicode.h"
#include "libunicode-table.h"
enum {
RUN_TYPE_U,
RUN_TYPE_L,
RUN_TYPE_UF,
RUN_TYPE_LF,
RUN_TYPE_UL,
RUN_TYPE_LSU,
RUN_TYPE_U2L_399_EXT2,
RUN_TYPE_UF_D20,
RUN_TYPE_UF_D1_EXT,
RUN_TYPE_U_EXT,
RUN_TYPE_LF_EXT,
RUN_TYPE_UF_EXT2,
RUN_TYPE_LF_EXT2,
RUN_TYPE_UF_EXT3,
};
static int lre_case_conv1(uint32_t c, int conv_type)
{
uint32_t res[LRE_CC_RES_LEN_MAX];
lre_case_conv(res, c, conv_type);
return res[0];
}
/* case conversion using the table entry 'idx' with value 'v' */
static int lre_case_conv_entry(uint32_t *res, uint32_t c, int conv_type, uint32_t idx, uint32_t v)
{
uint32_t code, data, type, a, is_lower;
is_lower = (conv_type != 0);
type = (v >> (32 - 17 - 7 - 4)) & 0xf;
data = ((v & 0xf) << 8) | case_conv_table2[idx];
code = v >> (32 - 17);
switch(type) {
case RUN_TYPE_U:
case RUN_TYPE_L:
case RUN_TYPE_UF:
case RUN_TYPE_LF:
if (conv_type == (type & 1) ||
(type >= RUN_TYPE_UF && conv_type == 2)) {
c = c - code + (case_conv_table1[data] >> (32 - 17));
}
break;
case RUN_TYPE_UL:
a = c - code;
if ((a & 1) != (1 - is_lower))
break;
c = (a ^ 1) + code;
break;
case RUN_TYPE_LSU:
a = c - code;
if (a == 1) {
c += 2 * is_lower - 1;
} else if (a == (1 - is_lower) * 2) {
c += (2 * is_lower - 1) * 2;
}
break;
case RUN_TYPE_U2L_399_EXT2:
if (!is_lower) {
res[0] = c - code + case_conv_ext[data >> 6];
res[1] = 0x399;
return 2;
} else {
c = c - code + case_conv_ext[data & 0x3f];
}
break;
case RUN_TYPE_UF_D20:
if (conv_type == 1)
break;
c = data + (conv_type == 2) * 0x20;
break;
case RUN_TYPE_UF_D1_EXT:
if (conv_type == 1)
break;
c = case_conv_ext[data] + (conv_type == 2);
break;
case RUN_TYPE_U_EXT:
case RUN_TYPE_LF_EXT:
if (is_lower != (type - RUN_TYPE_U_EXT))
break;
c = case_conv_ext[data];
break;
case RUN_TYPE_LF_EXT2:
if (!is_lower)
break;
res[0] = c - code + case_conv_ext[data >> 6];
res[1] = case_conv_ext[data & 0x3f];
return 2;
case RUN_TYPE_UF_EXT2:
if (conv_type == 1)
break;
res[0] = c - code + case_conv_ext[data >> 6];
res[1] = case_conv_ext[data & 0x3f];
if (conv_type == 2) {
/* convert to lower */
res[0] = lre_case_conv1(res[0], 1);
res[1] = lre_case_conv1(res[1], 1);
}
return 2;
default:
case RUN_TYPE_UF_EXT3:
if (conv_type == 1)
break;
res[0] = case_conv_ext[data >> 8];
res[1] = case_conv_ext[(data >> 4) & 0xf];
res[2] = case_conv_ext[data & 0xf];
if (conv_type == 2) {
/* convert to lower */
res[0] = lre_case_conv1(res[0], 1);
res[1] = lre_case_conv1(res[1], 1);
res[2] = lre_case_conv1(res[2], 1);
}
return 3;
}
res[0] = c;
return 1;
}
/* conv_type:
0 = to upper
1 = to lower
2 = case folding (= to lower with modifications)
*/
int lre_case_conv(uint32_t *res, uint32_t c, int conv_type)
{
if (c < 128) {
if (conv_type) {
if (c >= 'A' && c <= 'Z') {
c = c - 'A' + 'a';
}
} else {
if (c >= 'a' && c <= 'z') {
c = c - 'a' + 'A';
}
}
} else {
uint32_t v, code, len;
int idx, idx_min, idx_max;
idx_min = 0;
idx_max = countof(case_conv_table1) - 1;
while (idx_min <= idx_max) {
idx = (unsigned)(idx_max + idx_min) / 2;
v = case_conv_table1[idx];
code = v >> (32 - 17);
len = (v >> (32 - 17 - 7)) & 0x7f;
if (c < code) {
idx_max = idx - 1;
} else if (c >= code + len) {
idx_min = idx + 1;
} else {
return lre_case_conv_entry(res, c, conv_type, idx, v);
}
}
}
res[0] = c;
return 1;
}
static int lre_case_folding_entry(uint32_t c, uint32_t idx, uint32_t v, BOOL is_unicode)
{
uint32_t res[LRE_CC_RES_LEN_MAX];
int len;
if (is_unicode) {
len = lre_case_conv_entry(res, c, 2, idx, v);
if (len == 1) {
c = res[0];
} else {
/* handle the few specific multi-character cases (see
unicode_gen.c:dump_case_folding_special_cases()) */
if (c == 0xfb06) {
c = 0xfb05;
} else if (c == 0x01fd3) {
c = 0x390;
} else if (c == 0x01fe3) {
c = 0x3b0;
}
}
} else {
if (likely(c < 128)) {
if (c >= 'a' && c <= 'z')
c = c - 'a' + 'A';
} else {
/* legacy regexp: to upper case if single char >= 128 */
len = lre_case_conv_entry(res, c, FALSE, idx, v);
if (len == 1 && res[0] >= 128)
c = res[0];
}
}
return c;
}
/* JS regexp specific rules for case folding */
int lre_canonicalize(uint32_t c, BOOL is_unicode)
{
if (c < 128) {
/* fast case */
if (is_unicode) {
if (c >= 'A' && c <= 'Z') {
c = c - 'A' + 'a';
}
} else {
if (c >= 'a' && c <= 'z') {
c = c - 'a' + 'A';
}
}
} else {
uint32_t v, code, len;
int idx, idx_min, idx_max;
idx_min = 0;
idx_max = countof(case_conv_table1) - 1;
while (idx_min <= idx_max) {
idx = (unsigned)(idx_max + idx_min) / 2;
v = case_conv_table1[idx];
code = v >> (32 - 17);
len = (v >> (32 - 17 - 7)) & 0x7f;
if (c < code) {
idx_max = idx - 1;
} else if (c >= code + len) {
idx_min = idx + 1;
} else {
return lre_case_folding_entry(c, idx, v, is_unicode);
}
}
}
return c;
}
static uint32_t get_le24(const uint8_t *ptr)
{
return ptr[0] | (ptr[1] << 8) | (ptr[2] << 16);
}
#define UNICODE_INDEX_BLOCK_LEN 32
/* return -1 if not in table, otherwise the offset in the block */
static int get_index_pos(uint32_t *pcode, uint32_t c,
const uint8_t *index_table, int index_table_len)
{
uint32_t code, v;
int idx_min, idx_max, idx;
idx_min = 0;
v = get_le24(index_table);
code = v & ((1 << 21) - 1);
if (c < code) {
*pcode = 0;
return 0;
}
idx_max = index_table_len - 1;
code = get_le24(index_table + idx_max * 3);
if (c >= code)
return -1;
/* invariant: tab[idx_min] <= c < tab2[idx_max] */
while ((idx_max - idx_min) > 1) {
idx = (idx_max + idx_min) / 2;
v = get_le24(index_table + idx * 3);
code = v & ((1 << 21) - 1);
if (c < code) {
idx_max = idx;
} else {
idx_min = idx;
}
}
v = get_le24(index_table + idx_min * 3);
*pcode = v & ((1 << 21) - 1);
return (idx_min + 1) * UNICODE_INDEX_BLOCK_LEN + (v >> 21);
}
static BOOL lre_is_in_table(uint32_t c, const uint8_t *table,
const uint8_t *index_table, int index_table_len)
{
uint32_t code, b, bit;
int pos;
const uint8_t *p;
pos = get_index_pos(&code, c, index_table, index_table_len);
if (pos < 0)
return FALSE; /* outside the table */
p = table + pos;
bit = 0;
/* Compressed run length encoding:
00..3F: 2 packed lengths: 3-bit + 3-bit
40..5F: 5-bits plus extra byte for length
60..7F: 5-bits plus 2 extra bytes for length
80..FF: 7-bit length
lengths must be incremented to get character count
Ranges alternate between false and true return value.
*/
for(;;) {
b = *p++;
if (b < 64) {
code += (b >> 3) + 1;
if (c < code)
return bit;
bit ^= 1;
code += (b & 7) + 1;
} else if (b >= 0x80) {
code += b - 0x80 + 1;
} else if (b < 0x60) {
code += (((b - 0x40) << 8) | p[0]) + 1;
p++;
} else {
code += (((b - 0x60) << 16) | (p[0] << 8) | p[1]) + 1;
p += 2;
}
if (c < code)
return bit;
bit ^= 1;
}
}
BOOL lre_is_cased(uint32_t c)
{
uint32_t v, code, len;
int idx, idx_min, idx_max;
idx_min = 0;
idx_max = countof(case_conv_table1) - 1;
while (idx_min <= idx_max) {
idx = (unsigned)(idx_max + idx_min) / 2;
v = case_conv_table1[idx];
code = v >> (32 - 17);
len = (v >> (32 - 17 - 7)) & 0x7f;
if (c < code) {
idx_max = idx - 1;
} else if (c >= code + len) {
idx_min = idx + 1;
} else {
return TRUE;
}
}
return lre_is_in_table(c, unicode_prop_Cased1_table,
unicode_prop_Cased1_index,
sizeof(unicode_prop_Cased1_index) / 3);
}
BOOL lre_is_case_ignorable(uint32_t c)
{
return lre_is_in_table(c, unicode_prop_Case_Ignorable_table,
unicode_prop_Case_Ignorable_index,
sizeof(unicode_prop_Case_Ignorable_index) / 3);
}
/* character range */
static __maybe_unused void cr_dump(CharRange *cr)
{
int i;
for(i = 0; i < cr->len; i++)
printf("%d: 0x%04x\n", i, cr->points[i]);
}
static void *cr_default_realloc(void *opaque, void *ptr, size_t size)
{
return realloc(ptr, size);
}
void cr_init(CharRange *cr, void *mem_opaque, DynBufReallocFunc *realloc_func)
{
cr->len = cr->size = 0;
cr->points = NULL;
cr->mem_opaque = mem_opaque;
cr->realloc_func = realloc_func ? realloc_func : cr_default_realloc;
}
void cr_free(CharRange *cr)
{
cr->realloc_func(cr->mem_opaque, cr->points, 0);
}
int cr_realloc(CharRange *cr, int size)
{
int new_size;
uint32_t *new_buf;
if (size > cr->size) {
new_size = max_int(size, cr->size * 3 / 2);
new_buf = cr->realloc_func(cr->mem_opaque, cr->points,
new_size * sizeof(cr->points[0]));
if (!new_buf)
return -1;
cr->points = new_buf;
cr->size = new_size;
}
return 0;
}
int cr_copy(CharRange *cr, const CharRange *cr1)
{
if (cr_realloc(cr, cr1->len))
return -1;
memcpy(cr->points, cr1->points, sizeof(cr->points[0]) * cr1->len);
cr->len = cr1->len;
return 0;
}
/* merge consecutive intervals and remove empty intervals */
static void cr_compress(CharRange *cr)
{
int i, j, k, len;
uint32_t *pt;
pt = cr->points;
len = cr->len;
i = 0;
j = 0;
k = 0;
while ((i + 1) < len) {
if (pt[i] == pt[i + 1]) {
/* empty interval */
i += 2;
} else {
j = i;
while ((j + 3) < len && pt[j + 1] == pt[j + 2])
j += 2;
/* just copy */
pt[k] = pt[i];
pt[k + 1] = pt[j + 1];
k += 2;
i = j + 2;
}
}
cr->len = k;
}
/* union or intersection */
int cr_op(CharRange *cr, const uint32_t *a_pt, int a_len,
const uint32_t *b_pt, int b_len, int op)
{
int a_idx, b_idx, is_in;
uint32_t v;
a_idx = 0;
b_idx = 0;
for(;;) {
/* get one more point from a or b in increasing order */
if (a_idx < a_len && b_idx < b_len) {
if (a_pt[a_idx] < b_pt[b_idx]) {
goto a_add;
} else if (a_pt[a_idx] == b_pt[b_idx]) {
v = a_pt[a_idx];
a_idx++;
b_idx++;
} else {
goto b_add;
}
} else if (a_idx < a_len) {
a_add:
v = a_pt[a_idx++];
} else if (b_idx < b_len) {
b_add:
v = b_pt[b_idx++];
} else {
break;
}
/* add the point if the in/out status changes */
switch(op) {
case CR_OP_UNION:
is_in = (a_idx & 1) | (b_idx & 1);
break;
case CR_OP_INTER:
is_in = (a_idx & 1) & (b_idx & 1);
break;
case CR_OP_XOR:
is_in = (a_idx & 1) ^ (b_idx & 1);
break;
default:
abort();
}
if (is_in != (cr->len & 1)) {
if (cr_add_point(cr, v))
return -1;
}
}
cr_compress(cr);
return 0;
}
int cr_union1(CharRange *cr, const uint32_t *b_pt, int b_len)
{
CharRange a = *cr;
int ret;
cr->len = 0;
cr->size = 0;
cr->points = NULL;
ret = cr_op(cr, a.points, a.len, b_pt, b_len, CR_OP_UNION);
cr_free(&a);
return ret;
}
int cr_invert(CharRange *cr)
{
int len;
len = cr->len;
if (cr_realloc(cr, len + 2))
return -1;
memmove(cr->points + 1, cr->points, len * sizeof(cr->points[0]));
cr->points[0] = 0;
cr->points[len + 1] = UINT32_MAX;
cr->len = len + 2;
cr_compress(cr);
return 0;
}
#ifdef CONFIG_ALL_UNICODE
BOOL lre_is_id_start(uint32_t c)
{
return lre_is_in_table(c, unicode_prop_ID_Start_table,
unicode_prop_ID_Start_index,
sizeof(unicode_prop_ID_Start_index) / 3);
}
BOOL lre_is_id_continue(uint32_t c)
{
return lre_is_id_start(c) ||
lre_is_in_table(c, unicode_prop_ID_Continue1_table,
unicode_prop_ID_Continue1_index,
sizeof(unicode_prop_ID_Continue1_index) / 3);
}
#define UNICODE_DECOMP_LEN_MAX 18
typedef enum {
DECOMP_TYPE_C1, /* 16 bit char */
DECOMP_TYPE_L1, /* 16 bit char table */
DECOMP_TYPE_L2,
DECOMP_TYPE_L3,
DECOMP_TYPE_L4,
DECOMP_TYPE_L5, /* XXX: not used */
DECOMP_TYPE_L6, /* XXX: could remove */
DECOMP_TYPE_L7, /* XXX: could remove */
DECOMP_TYPE_LL1, /* 18 bit char table */
DECOMP_TYPE_LL2,
DECOMP_TYPE_S1, /* 8 bit char table */
DECOMP_TYPE_S2,
DECOMP_TYPE_S3,
DECOMP_TYPE_S4,
DECOMP_TYPE_S5,
DECOMP_TYPE_I1, /* increment 16 bit char value */
DECOMP_TYPE_I2_0,
DECOMP_TYPE_I2_1,
DECOMP_TYPE_I3_1,
DECOMP_TYPE_I3_2,
DECOMP_TYPE_I4_1,
DECOMP_TYPE_I4_2,
DECOMP_TYPE_B1, /* 16 bit base + 8 bit offset */
DECOMP_TYPE_B2,
DECOMP_TYPE_B3,
DECOMP_TYPE_B4,
DECOMP_TYPE_B5,
DECOMP_TYPE_B6,
DECOMP_TYPE_B7,
DECOMP_TYPE_B8,
DECOMP_TYPE_B18,
DECOMP_TYPE_LS2,
DECOMP_TYPE_PAT3,
DECOMP_TYPE_S2_UL,
DECOMP_TYPE_LS2_UL,
} DecompTypeEnum;
static uint32_t unicode_get_short_code(uint32_t c)
{
static const uint16_t unicode_short_table[2] = { 0x2044, 0x2215 };
if (c < 0x80)
return c;
else if (c < 0x80 + 0x50)
return c - 0x80 + 0x300;
else
return unicode_short_table[c - 0x80 - 0x50];
}
static uint32_t unicode_get_lower_simple(uint32_t c)
{
if (c < 0x100 || (c >= 0x410 && c <= 0x42f))
c += 0x20;
else
c++;
return c;
}
static uint16_t unicode_get16(const uint8_t *p)
{
return p[0] | (p[1] << 8);
}
static int unicode_decomp_entry(uint32_t *res, uint32_t c,
int idx, uint32_t code, uint32_t len,
uint32_t type)
{
uint32_t c1;
int l, i, p;
const uint8_t *d;
if (type == DECOMP_TYPE_C1) {
res[0] = unicode_decomp_table2[idx];
return 1;
} else {
d = unicode_decomp_data + unicode_decomp_table2[idx];
switch(type) {
case DECOMP_TYPE_L1:
case DECOMP_TYPE_L2:
case DECOMP_TYPE_L3:
case DECOMP_TYPE_L4:
case DECOMP_TYPE_L5:
case DECOMP_TYPE_L6:
case DECOMP_TYPE_L7:
l = type - DECOMP_TYPE_L1 + 1;
d += (c - code) * l * 2;
for(i = 0; i < l; i++) {
if ((res[i] = unicode_get16(d + 2 * i)) == 0)
return 0;
}
return l;
case DECOMP_TYPE_LL1:
case DECOMP_TYPE_LL2:
{
uint32_t k, p;
l = type - DECOMP_TYPE_LL1 + 1;
k = (c - code) * l;
p = len * l * 2;
for(i = 0; i < l; i++) {
c1 = unicode_get16(d + 2 * k) |
(((d[p + (k / 4)] >> ((k % 4) * 2)) & 3) << 16);
if (!c1)
return 0;
res[i] = c1;
k++;
}
}
return l;
case DECOMP_TYPE_S1:
case DECOMP_TYPE_S2:
case DECOMP_TYPE_S3:
case DECOMP_TYPE_S4:
case DECOMP_TYPE_S5:
l = type - DECOMP_TYPE_S1 + 1;
d += (c - code) * l;
for(i = 0; i < l; i++) {
if ((res[i] = unicode_get_short_code(d[i])) == 0)
return 0;
}
return l;
case DECOMP_TYPE_I1:
l = 1;
p = 0;
goto decomp_type_i;
case DECOMP_TYPE_I2_0:
case DECOMP_TYPE_I2_1:
case DECOMP_TYPE_I3_1:
case DECOMP_TYPE_I3_2:
case DECOMP_TYPE_I4_1:
case DECOMP_TYPE_I4_2:
l = 2 + ((type - DECOMP_TYPE_I2_0) >> 1);
p = ((type - DECOMP_TYPE_I2_0) & 1) + (l > 2);
decomp_type_i:
for(i = 0; i < l; i++) {
c1 = unicode_get16(d + 2 * i);
if (i == p)
c1 += c - code;
res[i] = c1;
}
return l;
case DECOMP_TYPE_B18:
l = 18;
goto decomp_type_b;
case DECOMP_TYPE_B1:
case DECOMP_TYPE_B2:
case DECOMP_TYPE_B3:
case DECOMP_TYPE_B4:
case DECOMP_TYPE_B5:
case DECOMP_TYPE_B6:
case DECOMP_TYPE_B7:
case DECOMP_TYPE_B8:
l = type - DECOMP_TYPE_B1 + 1;
decomp_type_b:
{
uint32_t c_min;
c_min = unicode_get16(d);
d += 2 + (c - code) * l;
for(i = 0; i < l; i++) {
c1 = d[i];
if (c1 == 0xff)
c1 = 0x20;
else
c1 += c_min;
res[i] = c1;
}
}
return l;
case DECOMP_TYPE_LS2:
d += (c - code) * 3;
if (!(res[0] = unicode_get16(d)))
return 0;
res[1] = unicode_get_short_code(d[2]);
return 2;
case DECOMP_TYPE_PAT3:
res[0] = unicode_get16(d);
res[2] = unicode_get16(d + 2);
d += 4 + (c - code) * 2;
res[1] = unicode_get16(d);
return 3;
case DECOMP_TYPE_S2_UL:
case DECOMP_TYPE_LS2_UL:
c1 = c - code;
if (type == DECOMP_TYPE_S2_UL) {
d += c1 & ~1;
c = unicode_get_short_code(*d);
d++;
} else {
d += (c1 >> 1) * 3;
c = unicode_get16(d);
d += 2;
}
if (c1 & 1)
c = unicode_get_lower_simple(c);
res[0] = c;
res[1] = unicode_get_short_code(*d);
return 2;
}
}
return 0;
}
/* return the length of the decomposition (length <=
UNICODE_DECOMP_LEN_MAX) or 0 if no decomposition */
static int unicode_decomp_char(uint32_t *res, uint32_t c, BOOL is_compat1)
{
uint32_t v, type, is_compat, code, len;
int idx_min, idx_max, idx;
idx_min = 0;
idx_max = countof(unicode_decomp_table1) - 1;
while (idx_min <= idx_max) {
idx = (idx_max + idx_min) / 2;
v = unicode_decomp_table1[idx];
code = v >> (32 - 18);
len = (v >> (32 - 18 - 7)) & 0x7f;
// printf("idx=%d code=%05x len=%d\n", idx, code, len);
if (c < code) {
idx_max = idx - 1;
} else if (c >= code + len) {
idx_min = idx + 1;
} else {
is_compat = v & 1;
if (is_compat1 < is_compat)
break;
type = (v >> (32 - 18 - 7 - 6)) & 0x3f;
return unicode_decomp_entry(res, c, idx, code, len, type);
}
}
return 0;
}
/* return 0 if no pair found */
static int unicode_compose_pair(uint32_t c0, uint32_t c1)
{
uint32_t code, len, type, v, idx1, d_idx, d_offset, ch;
int idx_min, idx_max, idx, d;
uint32_t pair[2];
idx_min = 0;
idx_max = countof(unicode_comp_table) - 1;
while (idx_min <= idx_max) {
idx = (idx_max + idx_min) / 2;
idx1 = unicode_comp_table[idx];
/* idx1 represent an entry of the decomposition table */
d_idx = idx1 >> 6;
d_offset = idx1 & 0x3f;
v = unicode_decomp_table1[d_idx];
code = v >> (32 - 18);
len = (v >> (32 - 18 - 7)) & 0x7f;
type = (v >> (32 - 18 - 7 - 6)) & 0x3f;
ch = code + d_offset;
unicode_decomp_entry(pair, ch, d_idx, code, len, type);
d = c0 - pair[0];
if (d == 0)
d = c1 - pair[1];
if (d < 0) {
idx_max = idx - 1;
} else if (d > 0) {
idx_min = idx + 1;
} else {
return ch;
}
}
return 0;
}
/* return the combining class of character c (between 0 and 255) */
static int unicode_get_cc(uint32_t c)
{
uint32_t code, n, type, cc, c1, b;
int pos;
const uint8_t *p;
pos = get_index_pos(&code, c,
unicode_cc_index, sizeof(unicode_cc_index) / 3);
if (pos < 0)
return 0;
p = unicode_cc_table + pos;
/* Compressed run length encoding:
- 2 high order bits are combining class type
- 0:0, 1:230, 2:extra byte linear progression, 3:extra byte
- 00..2F: range length (add 1)
- 30..37: 3-bit range-length + 1 extra byte
- 38..3F: 3-bit range-length + 2 extra byte
*/
for(;;) {
b = *p++;
type = b >> 6;
n = b & 0x3f;
if (n < 48) {
} else if (n < 56) {
n = (n - 48) << 8;
n |= *p++;
n += 48;
} else {
n = (n - 56) << 8;
n |= *p++ << 8;
n |= *p++;
n += 48 + (1 << 11);
}
if (type <= 1)
p++;
c1 = code + n + 1;
if (c < c1) {
switch(type) {
case 0:
cc = p[-1];
break;
case 1:
cc = p[-1] + c - code;
break;
case 2:
cc = 0;
break;
default:
case 3:
cc = 230;
break;
}
return cc;
}
code = c1;
}
}
static void sort_cc(int *buf, int len)
{
int i, j, k, cc, cc1, start, ch1;
for(i = 0; i < len; i++) {
cc = unicode_get_cc(buf[i]);
if (cc != 0) {
start = i;
j = i + 1;
while (j < len) {
ch1 = buf[j];
cc1 = unicode_get_cc(ch1);
if (cc1 == 0)
break;
k = j - 1;
while (k >= start) {
if (unicode_get_cc(buf[k]) <= cc1)
break;
buf[k + 1] = buf[k];
k--;
}
buf[k + 1] = ch1;
j++;
}
#if 0
printf("cc:");
for(k = start; k < j; k++) {
printf(" %3d", unicode_get_cc(buf[k]));
}
printf("\n");
#endif
i = j;
}
}
}
static void to_nfd_rec(DynBuf *dbuf,
const int *src, int src_len, int is_compat)
{
uint32_t c, v;
int i, l;
uint32_t res[UNICODE_DECOMP_LEN_MAX];
for(i = 0; i < src_len; i++) {
c = src[i];
if (c >= 0xac00 && c < 0xd7a4) {
/* Hangul decomposition */
c -= 0xac00;
dbuf_put_u32(dbuf, 0x1100 + c / 588);
dbuf_put_u32(dbuf, 0x1161 + (c % 588) / 28);
v = c % 28;
if (v != 0)
dbuf_put_u32(dbuf, 0x11a7 + v);
} else {
l = unicode_decomp_char(res, c, is_compat);
if (l) {
to_nfd_rec(dbuf, (int *)res, l, is_compat);
} else {
dbuf_put_u32(dbuf, c);
}
}
}
}
/* return 0 if not found */
static int compose_pair(uint32_t c0, uint32_t c1)
{
/* Hangul composition */
if (c0 >= 0x1100 && c0 < 0x1100 + 19 &&
c1 >= 0x1161 && c1 < 0x1161 + 21) {
return 0xac00 + (c0 - 0x1100) * 588 + (c1 - 0x1161) * 28;
} else if (c0 >= 0xac00 && c0 < 0xac00 + 11172 &&
(c0 - 0xac00) % 28 == 0 &&
c1 >= 0x11a7 && c1 < 0x11a7 + 28) {
return c0 + c1 - 0x11a7;
} else {
return unicode_compose_pair(c0, c1);
}
}
int unicode_normalize(uint32_t **pdst, const uint32_t *src, int src_len,
UnicodeNormalizationEnum n_type,
void *opaque, DynBufReallocFunc *realloc_func)
{
int *buf, buf_len, i, p, starter_pos, cc, last_cc, out_len;
BOOL is_compat;
DynBuf dbuf_s, *dbuf = &dbuf_s;
is_compat = n_type >> 1;
dbuf_init2(dbuf, opaque, realloc_func);
if (dbuf_realloc(dbuf, sizeof(int) * src_len))
goto fail;
/* common case: latin1 is unaffected by NFC */
if (n_type == UNICODE_NFC) {
for(i = 0; i < src_len; i++) {
if (src[i] >= 0x100)
goto not_latin1;
}
buf = (int *)dbuf->buf;
memcpy(buf, src, src_len * sizeof(int));
*pdst = (uint32_t *)buf;
return src_len;
not_latin1: ;
}
to_nfd_rec(dbuf, (const int *)src, src_len, is_compat);
if (dbuf_error(dbuf)) {
fail:
*pdst = NULL;
return -1;
}
buf = (int *)dbuf->buf;