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charset.c
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/*
* Basic Charset functions for QEmacs
*
* Copyright (c) 2000-2002 Fabrice Bellard.
* Copyright (c) 2002-2017 Charlie Gordon.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "qe.h"
/* XXX: Should move this to QEmacsState, and find a way for html2png */
struct QECharset *first_charset;
/* Unicode utilities */
/* Compute tty width of unicode characters. This is a modified
* implementation of wcwidth() from Markus Kuhn. We handle most
* non spacing and enclosing combining characters.
*/
static unsigned int const unicode_glyph_ranges[] = {
/* width table is produced by unitable.c */
#include "unicode_width.h"
};
static const unsigned int *unicode_glyph_range_index[0x20];
int unicode_tty_glyph_width(unsigned int ucs)
{
/* Iterative lookup with fast initial jump, no boundary test needed */
/* Very efficient for BMP and SMP code-points */
unsigned int const *ip = unicode_glyph_range_index[(ucs >> 12) & 0x1F];
while (ucs > ip[0]) {
ip += 2;
}
return ip[1];
}
/* utf-8 specific tables */
#define REP2(x) x, x
#define REP4(x) x, x, x, x
#define REP8(x) REP4(x), REP4(x)
#define REP16(x) REP4(x), REP4(x), REP4(x), REP4(x)
#define REP32(x) REP16(x), REP16(x)
#define REP64(x) REP16(x), REP16(x), REP16(x), REP16(x)
#define REP128(x) REP64(x), REP64(x)
#define REP256(x) REP64(x), REP64(x), REP64(x), REP64(x)
#define RUN2(x) (x)+0, (x)+1
#define RUN4(x) (x)+0, (x)+1, (x)+2, (x)+3
#define RUN8(x) RUN4(x), RUN4((x)+4)
#define RUN16(x) RUN4(x), RUN4((x)+4), RUN4((x)+8), RUN4((x)+12)
#define RUN32(x) RUN16(x), RUN16((x)+16)
#define RUN64(x) RUN16(x), RUN16((x)+16), RUN16((x)+32), RUN16((x)+48)
#define RUN128(x) RUN64(x), RUN64((x)+64)
#define RUN256(x) RUN64(x), RUN64((x)+64), RUN64((x)+128), RUN64((x)+192)
static unsigned short const table_idem[256] = { RUN256(0) };
static unsigned short const table_none[256] = { REP256(ESCAPE_CHAR) };
static unsigned short const table_utf8[256] = {
RUN128(0), /* [0x00...0x80] are self-encoding ASCII bytes */
REP64(INVALID_CHAR), /* [0x80...0xC0] are invalid prefix bytes */
REP32(ESCAPE_CHAR), /* [0xC0...0xE0] leading bytes of 2 byte sequences */
REP16(ESCAPE_CHAR), /* [0xE0...0xF0] leading bytes of 3 byte sequences */
REP8(ESCAPE_CHAR), /* [0xF0...0xF8] leading bytes of 4 byte sequences */
REP4(ESCAPE_CHAR), /* [0xF8...0xFC] leading bytes of 5 byte sequences */
REP2(ESCAPE_CHAR), /* [0xFC...0xFE] leading bytes of byte sequences */
INVALID_CHAR, /* 0xFE is invalid in UTF-8 encoding */
INVALID_CHAR, /* 0xFF is invalid in UTF-8 encoding */
};
unsigned char const utf8_length[256] = {
REP128(1), /* [0x00...0x80] are self-encoding ASCII bytes */
REP64(1), /* [0x80...0xC0] are invalid prefix bytes, could use 0 */
REP32(2), /* [0xC0...0xE0] leading bytes of 2 byte sequences */
REP16(3), /* [0xE0...0xF0] leading bytes of 3 byte sequences */
REP8(4), /* [0xF0...0xF8] leading bytes of 4 byte sequences */
REP4(5), /* [0xF8...0xFC] leading bytes of 5 byte sequences */
REP2(6), /* [0xFC...0xFE] leading bytes of byte sequences */
1, /* 0xFE is invalid in UTF-8 encoding */
1, /* 0xFF is invalid in UTF-8 encoding */
};
static unsigned int const utf8_min_code[7] = {
0, 0, 0x80, 0x800, 0x10000, 0x00200000, 0x04000000,
};
static unsigned char const utf8_first_code_mask[7] = {
0, 0, 0x1f, 0xf, 0x7, 0x3, 0x1,
};
/********************************************************/
/* raw */
static u8 *encode_raw(qe__unused__ QECharset *charset, u8 *p, int c)
{
if (c <= 0xff) {
*p++ = c;
return p;
} else {
return NULL;
}
}
struct QECharset charset_raw = {
"raw",
"binary|none",
NULL,
NULL,
decode_8bit,
encode_raw,
charset_get_pos_8bit,
charset_get_chars_8bit,
charset_goto_char_8bit,
charset_goto_line_8bit,
1, 0, 0, 10, 0, 0, table_idem, NULL, NULL,
};
/********************************************************/
/* 8859-1 */
static int probe_8859_1(qe__unused__ QECharset *charset, const u8 *buf, int size)
{
const uint32_t magic = (1U << '\b') | (1U << '\t') | (1U << '\f') |
(1U << '\n') | (1U << '\r') | (1U << '\033') |
(1U << 0x0e) | (1U << 0x0f) | (1U << 0x1a) |
(1U << 0x1f);
const u8 *p = buf;
const u8 *p_end = p + size;
uint32_t c;
int count_spaces, count_lines, count_high;
count_spaces = count_lines = count_high = 0;
while (p < p_end) {
c = p[0];
p += 1;
if (c <= 32) {
if (c == ' ')
count_spaces++;
else
if (c == '\n')
count_lines++;
else
if (!(magic & (1U << c)))
return 0;
} else
if (c < 0x7F) {
continue;
} else
if (c < 0x80) {
return 0;
} else {
count_high++;
}
}
if (count_spaces | count_lines)
return 1;
else
return 0;
}
static u8 *encode_8859_1(qe__unused__ QECharset *charset, u8 *p, int c)
{
if (c <= 0xff) {
*p++ = c;
return p;
} else {
return NULL;
}
}
struct QECharset charset_8859_1 = {
"8859-1",
"ISO-8859-1|iso-ir-100|latin1|l1|819",
probe_8859_1,
NULL,
decode_8bit,
encode_8859_1,
charset_get_pos_8bit,
charset_get_chars_8bit,
charset_goto_char_8bit,
charset_goto_line_8bit,
1, 0, 0, 10, 0, 0, table_idem, NULL, NULL,
};
/********************************************************/
/* vt100 */
static u8 *encode_vt100(qe__unused__ QECharset *charset, u8 *p, int c)
{
if (c <= 0xff) {
*p++ = c;
return p;
} else {
return NULL;
}
}
struct QECharset charset_vt100 = {
"vt100",
NULL,
NULL,
NULL,
decode_8bit,
encode_vt100,
charset_get_pos_8bit,
charset_get_chars_8bit,
charset_goto_char_8bit,
charset_goto_line_8bit,
1, 0, 0, 10, 0, 0, table_idem, NULL, NULL,
};
/********************************************************/
/* 7 bit */
static u8 *encode_7bit(qe__unused__ QECharset *charset, u8 *p, int c)
{
if (c <= 0x7f) {
*p++ = c;
return p;
} else {
return NULL;
}
}
static struct QECharset charset_7bit = {
"7bit",
"us-ascii|ascii|7-bit|iso-ir-6|ANSI_X3.4|646",
NULL,
NULL,
decode_8bit,
encode_7bit,
charset_get_pos_8bit,
charset_get_chars_8bit,
charset_goto_char_8bit,
charset_goto_line_8bit,
1, 0, 0, 10, 0, 0, table_idem, NULL, NULL,
};
/********************************************************/
/* UTF8 */
/* return the utf8 char and increment 'p' of at least one char. strict
decoding is done (refuse non canonical UTF8) */
int utf8_decode(const char **pp)
{
unsigned int c, c1;
const u8 *p;
int i, l;
p = *(const u8 **)pp;
c = *p++;
if (c < 128) {
/* fast case for ASCII */
} else {
l = utf8_length[c];
if (l == 1)
goto fail; /* can only be multi byte code here */
c = c & utf8_first_code_mask[l];
for (i = 1; i < l; i++) {
c1 = *p;
if (c1 < 0x80 || c1 >= 0xc0)
goto fail;
p++;
c = (c << 6) | (c1 & 0x3f);
}
if (c < utf8_min_code[l])
goto fail;
/* exclude surrogate pairs and special codes */
if ((c >= 0xd800 && c <= 0xdfff) ||
c == 0xfffe || c == 0xffff)
goto fail;
}
*(const u8 **)pp = p;
return c;
fail:
*(const u8 **)pp = p;
return INVALID_CHAR;
}
/* NOTE: the buffer must be at least 6 bytes long. Return number of
* bytes copied. */
int utf8_encode(char *q0, int c)
{
char *q = q0;
if (c < 0x80) {
*q++ = c;
} else {
if (c < 0x800) {
*q++ = (c >> 6) | 0xc0;
} else {
if (c < 0x10000) {
*q++ = (c >> 12) | 0xe0;
} else {
if (c < 0x00200000) {
*q++ = (c >> 18) | 0xf0;
} else {
if (c < 0x04000000) {
*q++ = (c >> 24) | 0xf8;
} else {
*q++ = (c >> 30) | 0xfc;
*q++ = ((c >> 24) & 0x3f) | 0x80;
}
*q++ = ((c >> 18) & 0x3f) | 0x80;
}
*q++ = ((c >> 12) & 0x3f) | 0x80;
}
*q++ = ((c >> 6) & 0x3f) | 0x80;
}
*q++ = (c & 0x3f) | 0x80;
}
return q - q0;
}
char *utf8_char_to_string(char *buf, int c) {
char *p = buf;
if (qe_isaccent(c))
*p++ = ' ';
p[utf8_encode(p, c)] = '\0';
return buf;
}
int utf8_to_unicode(unsigned int *dest, int dest_length, const char *str)
{
const char *p;
unsigned int *uq, *uq_end, c;
if (dest_length <= 0)
return 0;
p = str;
uq = dest;
uq_end = dest + dest_length - 1;
for (;;) {
if (uq >= uq_end)
break;
c = utf8_decode(&p);
if (c == '\0')
break;
*uq++ = c;
}
*uq = 0;
return uq - dest;
}
static int probe_utf8(qe__unused__ QECharset *charset, const u8 *buf, int size)
{
const uint32_t magic = (1U << '\b') | (1U << '\t') | (1U << '\f') |
(1U << '\n') | (1U << '\r') | (1U << '\033') |
(1U << 0x0e) | (1U << 0x0f) | (1U << 0x1a) |
(1U << 0x1f);
const u8 *p = buf;
const u8 *p_end = p + size;
uint32_t c;
int count_spaces, count_lines, count_utf8;
count_spaces = count_lines = count_utf8 = 0;
while (p < p_end) {
c = p[0];
p += 1;
if (c <= 32) {
if (c == ' ')
count_spaces++;
else
if (c == '\n')
count_lines++;
else
if (!(magic & (1U << c)))
return 0;
} else
if (c < 0x7F) {
continue;
} else
if (c < 0xc0) {
return 0;
} else
if (c < 0xe0) {
if (p[0] < 0x80 || p[0] > 0xbf)
return 0;
count_utf8++;
p += 1;
} else
if (c < 0xf0) {
if (p[0] < 0x80 || p[0] > 0xbf || p[1] < 0x80 || p[1] > 0xbf)
return 0;
count_utf8++;
p += 2;
} else
if (c < 0xf8) {
if (p[0] < 0x80 || p[0] > 0xbf || p[1] < 0x80 || p[1] > 0xbf
|| p[2] < 0x80 || p[2] > 0xbf)
return 0;
count_utf8++;
p += 3;
} else
if (c < 0xfc) {
if (p[0] < 0x80 || p[0] > 0xbf || p[1] < 0x80 || p[1] > 0xbf
|| p[2] < 0x80 || p[2] > 0xbf || p[3] < 0x80 || p[3] > 0xbf)
return 0;
count_utf8++;
p += 4;
} else
if (c < 0xfe) {
if (p[0] < 0x80 || p[0] > 0xbf || p[1] < 0x80 || p[1] > 0xbf
|| p[2] < 0x80 || p[2] > 0xbf || p[3] < 0x80 || p[3] > 0xbf
|| p[4] < 0x80 || p[4] > 0xbf)
return 0;
count_utf8++;
p += 5;
} else {
return 0;
}
}
if (count_spaces | count_lines | count_utf8)
return 1;
else
return 0;
}
static int decode_utf8_func(CharsetDecodeState *s)
{
return utf8_decode((const char **)(void *)&s->p);
}
static u8 *encode_utf8(qe__unused__ QECharset *charset, u8 *q, int c)
{
return q + utf8_encode((char*)q, c);
}
/* return the number of lines and column position for a buffer */
static void charset_get_pos_utf8(CharsetDecodeState *s, const u8 *buf, int size,
int *line_ptr, int *col_ptr)
{
const u8 *p, *p1, *lp;
int nl, line, col;
QASSERT(size >= 0);
line = 0;
lp = p = buf;
p1 = p + size;
nl = s->eol_char;
for (;;) {
p = memchr(p, nl, p1 - p);
if (!p)
break;
p++;
lp = p;
line++;
}
/* now compute number of chars (XXX: potential problem if out of
* block, but for UTF8 it works) */
col = 0;
while (lp < p1) {
col++;
lp += utf8_length[*lp];
}
*line_ptr = line;
*col_ptr = col;
}
static int charset_get_chars_utf8(CharsetDecodeState *s,
const u8 *buf, int size)
{
int nb_chars, c;
const u8 *buf_end, *buf_ptr;
nb_chars = 0;
buf_ptr = buf;
buf_end = buf_ptr + size;
while (buf_ptr < buf_end) {
c = *buf_ptr++;
if (c == '\n' && s->eol_type == EOL_DOS) {
/* ignore \n in EOL_DOS scan, but count \r.
* XXX: potentially incorrect if buffer contains
* \n not preceded by \r and requires special state
* data to handle \r\n sequence at page boundary.
*/
continue;
}
/* ignoring trailing bytes: will produce incorrect
* count on isolated and trailing bytes and overlong
* sequences.
*/
if (c < 0x80 || c >= 0xc0)
nb_chars++;
}
/* CG: nb_chars is the number of character boundaries, trailing
* utf-8 sequence at start of buffer is ignored in count while
* incomplete utf-8 sequence at end of buffer is counted. This may
* cause problems when counting characters with eb_get_pos with an
* offset falling inside a utf-8 sequence, and will produce
* incorrect counts on broken utf-8 sequences spanning page
* boundaries.
*/
return nb_chars;
}
static int charset_goto_char_utf8(CharsetDecodeState *s,
const u8 *buf, int size, int pos)
{
int nb_chars, c;
const u8 *buf_ptr, *buf_end;
nb_chars = 0;
buf_ptr = buf;
buf_end = buf_ptr + size;
for (; buf_ptr < buf_end; buf_ptr++) {
c = *buf_ptr;
if (c >= 0x80 && c < 0xc0) {
/* Test done here to skip initial trailing bytes if any */
continue;
}
if (c == '\n' && s->eol_type == EOL_DOS) {
/* ignore \n in EOL_DOS scan, but count \r.
* see comment above.
*/
continue;
}
if (nb_chars >= pos)
break;
nb_chars++;
}
return buf_ptr - buf;
}
struct QECharset charset_utf8 = {
"utf-8",
"utf8|al32utf8",
probe_utf8,
NULL,
decode_utf8_func,
encode_utf8,
charset_get_pos_utf8,
charset_get_chars_utf8,
charset_goto_char_utf8,
charset_goto_line_8bit,
1, 1, 0, 10, 0, 0, table_utf8, NULL, NULL,
};
/********************************************************/
/* UCS2/UCS4 */
static int probe_ucs2le(qe__unused__ QECharset *charset, const u8 *buf, int size)
{
const uint32_t magic = (1U << '\b') | (1U << '\t') | (1U << '\f') |
(1U << '\n') | (1U << '\r') | (1U << '\033') |
(1U << 0x0e) | (1U << 0x0f) | (1U << 0x1a) |
(1U << 0x1f);
const u8 *p = buf;
const u8 *p_end = p + (size & ~1);
uint32_t c;
int count_spaces, count_lines;
if (size & 1)
return 0;
count_spaces = count_lines = 0;
while (p < p_end) {
c = (p[0] << 0) | (p[1] << 8);
p += 2;
if (c <= 32) {
if (c == ' ')
count_spaces++;
else
if (c == '\n')
count_lines++;
else
if (!(magic & (1U << c)))
return 0;
} else
if (c >= 0x10000) {
return 0;
}
}
if (count_spaces + count_lines > size / (16 * 2))
return 1;
else
return 0;
}
static int decode_ucs2le(CharsetDecodeState *s)
{
/* XXX: should handle surrogates */
const u8 *p;
p = s->p;
s->p += 2;
return p[0] + (p[1] << 8);
}
static u8 *encode_ucs2le(qe__unused__ QECharset *charset, u8 *p, int c)
{
/* XXX: should handle surrogates */
p[0] = c;
p[1] = c >> 8;
return p + 2;
}
/* return the number of lines and column position for a buffer */
static void charset_get_pos_ucs2(CharsetDecodeState *s, const u8 *buf, int size,
int *line_ptr, int *col_ptr)
{
const uint16_t *p, *p1, *lp;
uint16_t nl, lf;
union { uint16_t n; char c[2]; } u;
int line, col;
line = 0;
lp = p = (const uint16_t *)(const void *)buf;
p1 = p + (size >> 1);
u.n = 0;
u.c[s->charset == &charset_ucs2be] = s->eol_char;
nl = u.n;
u.c[s->charset == &charset_ucs2be] = '\n';
lf = u.n;
if (s->eol_type == EOL_DOS && p < p1 && *p == lf) {
/* Skip \n at start of buffer.
* Should check for pending skip state */
p++;
lp++;
}
/* XXX: should handle surrogates */
while (p < p1) {
if (*p++ == nl) {
if (s->eol_type == EOL_DOS && p < p1 && *p == lf)
p++;
lp = p;
line++;
}
}
col = p1 - lp;
*line_ptr = line;
*col_ptr = col;
}
static int charset_goto_line_ucs2(CharsetDecodeState *s,
const u8 *buf, int size, int nlines)
{
const uint16_t *p, *p1, *lp;
uint16_t nl, lf;
union { uint16_t n; char c[2]; } u;
lp = p = (const uint16_t *)(const void *)buf;
p1 = p + (size >> 1);
u.n = 0;
u.c[s->charset == &charset_ucs2be] = s->eol_char;
nl = u.n;
u.c[s->charset == &charset_ucs2be] = '\n';
lf = u.n;
if (s->eol_type == EOL_DOS && p < p1 && *p == lf) {
/* Skip \n at start of buffer.
* Should check for pending skip state */
p++;
lp++;
}
while (nlines > 0 && p < p1) {
while (p < p1) {
if (*p++ == nl) {
if (s->eol_type == EOL_DOS && p < p1 && *p == lf)
p++;
lp = p;
nlines--;
break;
}
}
}
return (const u8 *)lp - buf;
}
static int probe_ucs2be(qe__unused__ QECharset *charset, const u8 *buf, int size)
{
const uint32_t magic = (1U << '\b') | (1U << '\t') | (1U << '\f') |
(1U << '\n') | (1U << '\r') | (1U << '\033') |
(1U << 0x0e) | (1U << 0x0f) | (1U << 0x1a) |
(1U << 0x1f);
const u8 *p = buf;
const u8 *p_end = p + (size & ~1);
uint32_t c;
int count_spaces, count_lines;
if (size & 1)
return 0;
count_spaces = count_lines = 0;
while (p < p_end) {
c = (p[0] << 8) | (p[1] << 0);
p += 2;
if (c <= 32) {
if (c == ' ')
count_spaces++;
else
if (c == '\n')
count_lines++;
else
if (!(magic & (1U << c)))
return 0;
} else
if (c >= 0x10000) {
return 0;
}
}
if (count_spaces + count_lines > size / (16 * 2))
return 1;
else
return 0;
}
static int decode_ucs2be(CharsetDecodeState *s)
{
/* XXX: should handle surrogates */
const u8 *p;
p = s->p;
s->p += 2;
return (p[0] << 8) + p[1];
}
static u8 *encode_ucs2be(qe__unused__ QECharset *charset, u8 *p, int c)
{
/* XXX: should handle surrogates */
p[0] = c >> 8;
p[1] = c;
return p + 2;
}
static int charset_get_chars_ucs2(CharsetDecodeState *s,
const u8 *buf, int size)
{
/* XXX: should handle surrogates */
int count = size >> 1; /* convert byte count to char16 count */
const uint16_t *buf_end, *buf_ptr;
uint16_t nl;
union { uint16_t n; char c[2]; } u;
if (s->eol_type != EOL_DOS)
return count;
buf_ptr = (const uint16_t *)(const void *)buf;
buf_end = buf_ptr + count;
// XXX: undefined behavior
u.n = 0;
u.c[s->charset == &charset_ucs2be] = '\n';
nl = u.n;
while (buf_ptr < buf_end) {
if (*buf_ptr++ == nl) {
/* ignore \n in EOL_DOS scan, but count \r. (see above) */
count--;
}
}
return count;
}
static int charset_goto_char_ucs2(CharsetDecodeState *s,
const u8 *buf, int size, int pos)
{
/* XXX: should handle surrogates */
int nb_chars;
const uint16_t *buf_ptr, *buf_end;
uint16_t nl;
union { uint16_t n; char c[2]; } u;
if (s->eol_type != EOL_DOS)
return min(pos << 1, size);
nb_chars = 0;
buf_ptr = (const uint16_t *)(const void *)buf;
buf_end = buf_ptr + (size >> 1);
// XXX: undefined behavior
u.n = 0;
u.c[s->charset == &charset_ucs2be] = '\n';
nl = u.n;
for (; buf_ptr < buf_end; buf_ptr++) {
if (*buf_ptr == nl) {
/* ignore \n in EOL_DOS scan, but count \r. (see above) */
continue;
}
if (nb_chars >= pos)
break;
nb_chars++;
}
return (const u8*)buf_ptr - buf;
}
struct QECharset charset_ucs2le = {
"ucs2le",
"utf16le|utf-16le",
probe_ucs2le,
NULL,
decode_ucs2le,
encode_ucs2le,
charset_get_pos_ucs2,
charset_get_chars_ucs2,
charset_goto_char_ucs2,
charset_goto_line_ucs2,
2, 0, 0, 10, 0, 0, table_none, NULL, NULL,
};
struct QECharset charset_ucs2be = {
"ucs2be",
"ucs2|utf16|utf-16|utf16be|utf-16be",
probe_ucs2be,
NULL,
decode_ucs2be,
encode_ucs2be,
charset_get_pos_ucs2,
charset_get_chars_ucs2,
charset_goto_char_ucs2,
charset_goto_line_ucs2,
2, 0, 0, 10, 0, 0, table_none, NULL, NULL,
};
static int probe_ucs4le(qe__unused__ QECharset *charset, const u8 *buf, int size)
{
const uint32_t magic = (1U << '\b') | (1U << '\t') | (1U << '\f') |
(1U << '\n') | (1U << '\r') | (1U << '\033') |
(1U << 0x0e) | (1U << 0x0f) | (1U << 0x1a) |
(1U << 0x1f);
const u8 *p = buf;
const u8 *p_end = p + (size & ~3);
uint32_t c;
int count_spaces, count_lines;
if (size & 3)
return 0;
count_spaces = count_lines = 0;
while (p < p_end) {
c = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
p += 4;
if (c <= 32) {
if (c == ' ')
count_spaces++;
else
if (c == '\n')
count_lines++;
else
if (!(magic & (1U << c)))
return 0;
} else
if (c > 0x10FFFF) {
return 0;
}
}
if (count_spaces + count_lines > size / (16 * 4))
return 1;
else
return 0;
}
static int decode_ucs4le(CharsetDecodeState *s)
{
const u8 *p;
p = s->p;
s->p += 4;
return p[0] + (p[1] << 8) + (p[2] << 16) + (p[3] << 24);
}
static u8 *encode_ucs4le(qe__unused__ QECharset *charset, u8 *p, int c)
{
p[0] = c;
p[1] = c >> 8;
p[2] = c >> 16;
p[3] = c >> 24;
return p + 4;
}
/* return the number of lines and column position for a buffer */
static void charset_get_pos_ucs4(CharsetDecodeState *s, const u8 *buf, int size,
int *line_ptr, int *col_ptr)
{
const uint32_t *p, *p1, *lp;
uint32_t nl, lf;
union { uint32_t n; char c[4]; } u;
int line, col;
line = 0;
lp = p = (const uint32_t *)(const void *)buf;
p1 = p + (size >> 2);
u.n = 0;
u.c[(s->charset == &charset_ucs4be) * 3] = s->eol_char;
nl = u.n;
u.c[(s->charset == &charset_ucs4be) * 3] = '\n';
lf = u.n;
if (s->eol_type == EOL_DOS && p < p1 && *p == lf) {
/* Skip \n at start of buffer.
* Should check for pending skip state */
p++;
lp++;
}
while (p < p1) {
if (*p++ == nl) {
if (s->eol_type == EOL_DOS && p < p1 && *p == lf)
p++;
lp = p;
line++;
}
}
col = p1 - lp;
*line_ptr = line;
*col_ptr = col;
}
static int charset_goto_line_ucs4(CharsetDecodeState *s,
const u8 *buf, int size, int nlines)
{
const uint32_t *p, *p1, *lp;
uint32_t nl, lf;
union { uint32_t n; char c[4]; } u;
lp = p = (const uint32_t *)(const void *)buf;
p1 = p + (size >> 2);
u.n = 0;
u.c[(s->charset == &charset_ucs4be) * 3] = s->eol_char;
nl = u.n;
u.c[(s->charset == &charset_ucs4be) * 3] = '\n';
lf = u.n;
if (s->eol_type == EOL_DOS && p < p1 && *p == lf) {
/* Skip \n at start of buffer.
* Should check for pending skip state */
p++;
lp++;
}
while (nlines > 0 && p < p1) {
while (p < p1) {
if (*p++ == nl) {
if (s->eol_type == EOL_DOS && p < p1 && *p == lf)
p++;
lp = p;
nlines--;
break;
}
}
}
return (const u8 *)lp - buf;
}
static int probe_ucs4be(qe__unused__ QECharset *charset, const u8 *buf, int size)
{
const uint32_t magic = (1U << '\b') | (1U << '\t') | (1U << '\f') |
(1U << '\n') | (1U << '\r') | (1U << '\033') |
(1U << 0x0e) | (1U << 0x0f) | (1U << 0x1a) |
(1U << 0x1f);
const u8 *p = buf;
const u8 *p_end = p + (size & ~3);
uint32_t c;
int count_spaces, count_lines;
if (size & 3)
return 0;
count_spaces = count_lines = 0;
while (p < p_end) {
c = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | (p[3] << 0);
p += 4;
if (c <= 32) {
if (c == ' ')
count_spaces++;
else
if (c == '\n')
count_lines++;
else
if (!(magic & (1U << c)))
return 0;
} else
if (c > 0x10FFFF) {