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evil-qemacs/charset.c
Charlie Gordon e89e07e318 bufed/dired: fix layout for non printing characters 
* add `eb_put_filename()` to encode buffer or file names with
  non-ASCII characters according to PF_xxx flags
* add `CF_SAVE_LIST` flag for completions to store the list
  of matches in `MinibufState`
* fix bufed and dired layout issues
* fix buffer and filename completion popup layout
* add commands to control display of Unicode and non printing
  charcaters in buffer or file names:
  - U toggles unicode display
  - \ cycles through 4 possible encodings: ? ^J \x10 \010
* use `(*fp)()` syntax for indirect function calls
2026-05-18 12:31:06 +02:00

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/*
* Basic Charset functions for QEmacs
*
* Copyright (c) 2000-2002 Fabrice Bellard.
* Copyright (c) 2002-2024 Charlie Gordon.
*
* 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 "charset.h"
/* XXX: Should move this to QEmacsState, and find a way for html2png */
struct QECharset *first_charset;
#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) };
/********************************************************/
/* raw */
static u8 *encode_raw(qe__unused__ QECharset *charset, u8 *p, char32_t 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, char32_t 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, char32_t 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, char32_t 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,
};
/********************************************************/
/* UTF-8 */
static unsigned short const table_utf8[256] = {
RUN128(0), /* [0x00...0x7F] are self-encoding ASCII bytes */
REP64(INVALID_CHAR), /* [0x80...0xBF] are invalid prefix bytes */
/* 0xC0 and 0xC1 are invalid prefix bytes because they encode 7-bit codes */
REP32(ESCAPE_CHAR), /* [0xC0...0xDF] leading bytes of 2 byte sequences */
REP16(ESCAPE_CHAR), /* [0xE0...0xEF] leading bytes of 3 byte sequences */
REP8(ESCAPE_CHAR), /* [0xF0...0xF7] leading bytes of 4 byte sequences */
REP4(ESCAPE_CHAR), /* [0xF8...0xFB] leading bytes of 5 byte sequences */
REP2(ESCAPE_CHAR), /* [0xFC...0xFD] leading bytes of 6 byte sequences */
/* allow for utf8x encoding */
ESCAPE_CHAR,//INVALID_CHAR, /* 0xFE is invalid in UTF-8 encoding */
ESCAPE_CHAR,//INVALID_CHAR, /* 0xFF is invalid in UTF-8 encoding */
};
static int probe_utf8(qe__unused__ QECharset *charset, const u8 *buf, int size)
{
/* probe initial file block for UTF-8 encoding:
scan buffer contents for valid ASCII and UTF-8 contents */
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++;
if (c <= 32) {
if (c == ' ')
count_spaces++;
else
if (c == '\n')
count_lines++;
else
if (!(magic & (1U << c)))
return 0;
} else
if (c < 0x7F) { /* ASCII subset */
continue;
} else
if (c < 0xc2) { /* UTF-8 trailing bytes and invalid prefix bytes */
return 0;
} else
if (c < 0xe0) { /* 2 byte UTF-8 encoding for U+0080..U+07FF */
if ((p[0] ^ 0x80) > 0x3f)
return 0;
count_utf8++;
p += 1;
} else
if (c < 0xf0) { /* 3 byte UTF-8 encoding for U+0800..U+FFFF */
if ((p[0] ^ 0x80) > 0x3f || (p[1] ^ 0x80) > 0x3f)
return 0;
count_utf8++;
p += 2;
} else
if (c < 0xf8) { /* 4 byte UTF-8 encoding for U+10000..U+10FFFF */
if ((p[0] ^ 0x80) > 0x3f || (p[1] ^ 0x80) > 0x3f
|| (p[2] ^ 0x80) > 0x3f)
return 0;
count_utf8++;
p += 3;
} else { /* overlong encodings and invalid lead bytes */
return 0;
}
}
if (count_spaces | count_lines | count_utf8)
return 1;
else
return 0;
}
static char32_t decode_utf8_func(CharsetDecodeState *s)
{
return utf8_decode((const char **)(void *)&s->p);
}
static u8 *encode_utf8(qe__unused__ QECharset *charset, u8 *q, char32_t 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 works for correctly encoded UTF-8 contents. */
// XXX: trailing bytes are counted at the start of the block.
// this is inconsistent with charset_goto_char_utf8().
// should instead count the number of single and leading bytes
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.
*/
nb_chars += ((c ^ 0x80) > 0x3f);
}
/* 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) <= 0x3f) {
/* 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 = {
"utf8",
"utf-8|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,
};
/* Extended UTF-8 encoding: accept any 32-bit value from 0 to 0xffffffff
All combinations are accepted.
*/
// XXX: should also have CESU-8 where non-BMP1 glyphs are encoded as
// surrogate pairs, themselves encoded in UTF-8.
static struct QECharset charset_utf8x = {
"utf8x",
"utf-8x",
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 char32_t decode_ucs2le(CharsetDecodeState *s) {
/* XXX: should handle surrogates */
const u8 *p;
p = s->p;
s->p += 2;
return p[0] + ((char32_t)p[1] << 8);
}
static u8 *encode_ucs2le(qe__unused__ QECharset *charset, u8 *p, char32_t 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 char32_t decode_ucs2be(CharsetDecodeState *s) {
/* XXX: should handle surrogates */
const u8 *p;
p = s->p;
s->p += 2;
return ((char32_t)p[0] << 8) + p[1];
}
static u8 *encode_ucs2be(qe__unused__ QECharset *charset, u8 *p, char32_t 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_offset(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 char32_t decode_ucs4le(CharsetDecodeState *s) {
const u8 *p;
p = s->p;
s->p += 4;
return (((char32_t)p[0] << 0) + ((char32_t)p[1] << 8) +
((char32_t)p[2] << 16) + ((char32_t)p[3] << 24));
}
static u8 *encode_ucs4le(qe__unused__ QECharset *charset, u8 *p, char32_t 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) {
return 0;
}
}
if (count_spaces + count_lines > size / (16 * 4))
return 1;
else
return 0;
}
static char32_t decode_ucs4be(CharsetDecodeState *s) {
const u8 *p;
p = s->p;
s->p += 4;
return (((char32_t)p[0] << 24) + ((char32_t)p[1] << 16) +
((char32_t)p[2] << 8) + ((char32_t)p[3] << 0));
}
static u8 *encode_ucs4be(qe__unused__ QECharset *charset, u8 *p, char32_t c)
{
p[0] = c >> 24;
p[1] = c >> 16;
p[2] = c >> 8;
p[3] = c;
return p + 4;
}
static int charset_get_chars_ucs4(CharsetDecodeState *s,
const u8 *buf, int size)
{
int count = size >> 2; /* convert byte count to char32 count */
const uint32_t *buf_end, *buf_ptr;
uint32_t nl;
union { uint32_t n; char c[4]; } u;
if (s->eol_type != EOL_DOS)
return count;
buf_ptr = (const uint32_t *)(const void *)buf;
buf_end = buf_ptr + count;
// XXX: undefined behavior
u.n = 0;
u.c[(s->charset == &charset_ucs4be) * 3] = '\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_ucs4(CharsetDecodeState *s,
const u8 *buf, int size, int pos)
{
int nb_chars;
const uint32_t *buf_ptr, *buf_end;
uint32_t nl;
union { uint32_t n; char c[4]; } u;
if (s->eol_type != EOL_DOS)
return min_offset(pos << 2, size);
nb_chars = 0;
buf_ptr = (const uint32_t *)(const void *)buf;
buf_end = buf_ptr + (size >> 2);
// XXX: undefined behavior
u.n = 0;
u.c[(s->charset == &charset_ucs4be) * 3] = '\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_ucs4le = {
"ucs4le",
"utf32le|utf-32le",
probe_ucs4le,
NULL,
decode_ucs4le,
encode_ucs4le,
charset_get_pos_ucs4,
charset_get_chars_ucs4,
charset_goto_char_ucs4,
charset_goto_line_ucs4,
4, 0, 0, 10, 0, 0, table_none, NULL, NULL,
};
struct QECharset charset_ucs4be = {
"ucs4be",
"ucs4|utf32|utf-32|utf32be|utf-32be",
probe_ucs4be,
NULL,
decode_ucs4be,
encode_ucs4be,
charset_get_pos_ucs4,
charset_get_chars_ucs4,
charset_goto_char_ucs4,
charset_goto_line_ucs4,
4, 0, 0, 10, 0, 0, table_none, NULL, NULL,
};
/********************************************************/
/* generic charset functions */
void qe_register_charset(struct QEmacsState *qs, struct QECharset *charset)
{
struct QECharset **pp;
pp = &first_charset;
while (*pp != NULL) {
if (*pp == charset)
return;
pp = &(*pp)->next;
}
*pp = charset;
}
void charset_complete(CompleteState *cp, CompleteFunc enumerate) {
QECharset *charset;
char name[32];
const char *p, *q;
for (charset = first_charset; charset != NULL; charset = charset->next) {
(*enumerate)(cp, charset->name, CT_STRX);
if (charset->aliases) {
for (q = p = charset->aliases;; q++) {
if (*q == '\0' || *q == '|') {
if (q > p) {
pstrncpy(name, sizeof(name), p, q - p);
(*enumerate)(cp, name, CT_STRX);
}
if (*q == '\0')
break;
p = q + 1;
}
}
}
}
}
QECharset *qe_find_charset(struct QEmacsState *qs, const char *name)
{
QECharset *charset;
if (!name)
return NULL;
for (charset = first_charset; charset != NULL; charset = charset->next) {
if (!strxcmp(charset->name, name)
|| (charset->aliases && strxfind(charset->aliases, name))) {
return charset;
}
}
return NULL;
}
void charset_decode_init(CharsetDecodeState *s, QECharset *charset,
EOLType eol_type)
{
s->table = charset->encode_table; /* default encode table */
if (charset->table_alloc) {
s->table = qe_malloc_array(unsigned short, 256);
if (!s->table) {
charset = &charset_8859_1;
s->table = charset->encode_table;
}
}
s->charset = charset;
s->char_size = charset->char_size;
s->eol_type = eol_type;
s->eol_char = charset->eol_char;
if (s->eol_char == '\n' && (s->eol_type == EOL_MAC || s->eol_type == EOL_DOS))
s->eol_char = '\r';
s->decode_func = charset->decode_func;
s->get_pos_func = charset->get_pos_func;
if (charset->decode_init)
charset->decode_init(s);
}
void charset_decode_close(CharsetDecodeState *s)
{
if (s->charset->table_alloc) {
/* remove the const qualifier */
qe_free(unconst(unsigned short **)&s->table);
}
/* safety */
memset(s, 0, sizeof(CharsetDecodeState));
}
/* detect the end of line type. */
static void detect_eol_type_8bit(const u8 *buf, int size,
QECharset *charset, EOLType *eol_typep)
{
const u8 *p, *p1;
int c, eol_bits;
EOLType eol_type;
if (!eol_typep)
return;
eol_type = *eol_typep;
p = buf;
p1 = p + size - 1;
eol_bits = 0;
while (p < p1) {
c = *p++;
if (c == '\r') {
if (*p == '\r') {
/* possibly spurious extra ^M in DOS file: ignore it,
* next iteration will determine if encoding is MAC or DOS
*/
} else
if (*p == '\n') {
p++;
eol_bits |= 1 << EOL_DOS;
} else {
eol_bits |= 1 << EOL_MAC;
}
} else
if (c == '\n') {
eol_bits |= 1 << EOL_UNIX;
}
}
switch (eol_bits) {
case 0:
/* no change, keep default value */
break;
case 1 << EOL_UNIX:
eol_type = EOL_UNIX;
break;
case 1 << EOL_DOS:
eol_type = EOL_DOS;
break;
case 1 << EOL_MAC:
eol_type = EOL_MAC;
break;
default:
/* A mixture of different styles, binary / unix */
eol_type = EOL_UNIX;
break;
}
*eol_typep = eol_type;
}
static void detect_eol_type_16bit(const u8 *buf, int size,
QECharset *charset, EOLType *eol_typep)
{
const uint16_t *p, *p1;
uint16_t c, cr, lf;
union { uint16_t n; char c[2]; } u;
int eol_bits;
EOLType eol_type;
if (!eol_typep)
return;
u.n = 0;
u.c[charset == &charset_ucs2be] = '\r';
cr = u.n;
u.c[charset == &charset_ucs2be] = '\n';
lf = u.n;
p = (const uint16_t *)(const void *)buf;
p1 = p + (size >> 1) - 1;
eol_bits = 0;
while (p < p1) {
c = *p++;
if (c == cr) {
if (*p == lf) {
p++;
eol_bits |= 1 << EOL_DOS;
} else {
eol_bits |= 1 << EOL_MAC;
}
} else
if (c == lf) {
eol_bits |= 1 << EOL_UNIX;
}
}
switch (eol_bits) {
case 0:
/* no change, keep default value */
eol_type = *eol_typep;
break;
case 1 << EOL_UNIX:
eol_type = EOL_UNIX;
break;
case 1 << EOL_DOS:
eol_type = EOL_DOS;
break;
case 1 << EOL_MAC:
eol_type = EOL_MAC;
break;
default:
/* A mixture of different styles, binary / unix */
eol_type = EOL_UNIX;
break;
}
*eol_typep = eol_type;
}
static void detect_eol_type_32bit(const u8 *buf, int size,
QECharset *charset, EOLType *eol_typep)
{
const uint32_t *p, *p1;
uint32_t c, cr, lf;
union { uint32_t n; char c[4]; } u;
int eol_bits;
EOLType eol_type;
if (!eol_typep)
return;
u.n = 0;
u.c[(charset == &charset_ucs4be) * 3] = '\r';
cr = u.n;
u.c[(charset == &charset_ucs4be) * 3] = '\n';
lf = u.n;
p = (const uint32_t *)(const void *)buf;
p1 = p + (size >> 2) - 1;
eol_bits = 0;
while (p < p1) {
c = *p++;
if (c == cr) {
if (*p == lf) {
p++;
eol_bits |= 1 << EOL_DOS;
} else {
eol_bits |= 1 << EOL_MAC;
}
} else
if (c == lf) {
eol_bits |= 1 << EOL_UNIX;
}
}
switch (eol_bits) {
case 0:
/* no change, keep default value */
eol_type = *eol_typep;
break;
case 1 << EOL_UNIX:
eol_type = EOL_UNIX;
break;
case 1 << EOL_DOS:
eol_type = EOL_DOS;
break;
case 1 << EOL_MAC:
eol_type = EOL_MAC;
break;
default:
/* A mixture of different styles, binary / unix */
eol_type = EOL_UNIX;
break;
}
*eol_typep = eol_type;
}
static QECharset *detect_eol_type(const u8 *buf, int size,
QECharset *charset, EOLType *eol_typep)
{
if (charset->char_size == 4)
detect_eol_type_32bit(buf, size, charset, eol_typep);
else
if (charset->char_size == 2)
detect_eol_type_16bit(buf, size, charset, eol_typep);
else
detect_eol_type_8bit(buf, size, charset, eol_typep);
return charset;
}
QECharset *detect_charset(const u8 *buf, int size, EOLType *eol_typep)
{
#if 0
QECharset *charset;
/* Try and determine charset */
/* CG: should iterate over charsets with probe function and score */
charset = &charset_utf8;
if (size > 0) {
if (charset_utf8.probe_func(&charset_utf8, buf, size))
charset = &charset_utf8;
else
if (charset_ucs4le.probe_func(&charset_ucs4le, buf, size))
charset = &charset_ucs4le;
else
if (charset_ucs4be.probe_func(&charset_ucs4be, buf, size))
charset = &charset_ucs4be;
else
if (charset_ucs2le.probe_func(&charset_ucs2le, buf, size))
charset = &charset_ucs2le;
else
if (charset_ucs2be.probe_func(&charset_ucs2be, buf, size))
charset = &charset_ucs2be;
else
charset = &charset_8859_1;
/* CG: should distinguish charset_8859_1, charset_raw and
* charset_auto */
}
return charset;
#else
/* Detect the charset:
UTF-8, UTF-16, UTF-32, Latin1, binary are detected */
int i, j, trail, bits;
char32_t c, min_code;
enum {
HAS_BINARY = 1, HAS_UTF8 = 2, TRAILING_BYTES = 4,
INVALID_PREFIX = 8, INVALID_SEQUENCE = 16, OVERLONG_ENCODING = 32,
HAS_SURROGATE = 64, INVALID_CODE = 128,
UTF8_MASK = 255,
};
const uint32_t magic = ((1U << '\b') | (1U << '\t') | (1U << '\f') |
(1U << '\n') | (1U << '\r') | (1U << '\033') |
(1U << 0x0e) | (1U << 0x0f) | (1U << 0x1a) |
(1U << 0x1f));
bits = 0;
for (i = 0; i < size;) {
c = buf[i++];
if (c < 32) {
if (!(magic & (1U << c)))
bits |= HAS_BINARY;
} else
if (c < 0x80) {
/* 0x7F should trigger HAS_BINARY? */
continue;
} else
if (c < 0xC0) {
bits |= TRAILING_BYTES;
} else {
bits |= HAS_UTF8;
if (c < 0xE0) {
trail = 1;
min_code = 0x80;
c &= 0x1f;
} else
if (c < 0xF0) {
trail = 2;
min_code = 0x800;
c &= 0x0f;
} else
if (c < 0xF8) {
trail = 3;
min_code = 0x10000;
c &= 0x07;
} else
if (c < 0xFC) {
trail = 4;
min_code = 0x00200000;
c &= 0x03;
} else {
trail = 5;
min_code = 0x04000000;
c &= 0x03;
}
if (i + trail > size)
break;
for (j = 0; j < trail; j++) {
char32_t c1 = buf[i + j] ^ 0x80;
if (c1 > 0x3f)
break;
c = (c << 6) + c1;
}
i += j;
if (j < trail) {
bits |= INVALID_SEQUENCE;
} else {
if (c < min_code)
bits |= OVERLONG_ENCODING;
if (c >= 0xd800 && c <= 0xdfff) {
// XXX: should detect CESU-8 encoding
bits |= HAS_SURROGATE;
}
if (c == 0xfffe || c == 0xffff || c > 0x10ffff)
bits |= INVALID_CODE;
}
}
}
if ((bits & (HAS_UTF8 | HAS_BINARY | TRAILING_BYTES | INVALID_SEQUENCE)) == HAS_UTF8) {
if (bits == HAS_UTF8) {
/* strict UTF-8 encoding */
return detect_eol_type(buf, size, &charset_utf8, eol_typep);
} else {
/* relax extended UTF-8 encoding */
return detect_eol_type(buf, size, &charset_utf8x, eol_typep);
}
}
/* Check for ZWNBSP as BOM: files starting with zero-width
* no-break space as a byte-order mark (BOM) will be detected
* as ucs2/UTF-16 or ucs4/UTF-32 encoded.
*/
if (size >= 2 && buf[0] == 0xff && buf[1] == 0xfe) {
if (size >= 4 && buf[2] == 0 && buf[3] == 0) {
return detect_eol_type(buf, size, &charset_ucs4le, eol_typep);
} else {
return detect_eol_type(buf, size, &charset_ucs2le, eol_typep);
}
}
if (size >= 2 && buf[0] == 0xfe && buf[1] == 0xff) {
return detect_eol_type(buf, size, &charset_ucs2be, eol_typep);
}
if (size >= 4
&& buf[0] == 0 && buf[1] == 0 && buf[2] == 0xfe && buf[3] == 0xff) {
return detect_eol_type(buf, size, &charset_ucs4be, eol_typep);
}
#if 0
{
/* Need a more reliable generic ucs2/ucs4 detection */
int maxc[4];
maxc[0] = maxc[1] = maxc[2] = maxc[3] = 0;
for (i = 0; i < size; i += 2) {
if (buf[i] > maxc[i & 3])
maxc[i & 3] = buf[i];
}
if (maxc[0] > 'a' && maxc[1] < 0x2f && maxc[2] > 'a' && maxc[3] < 0x2f) {
detect_eol_type(buf, size, &charset_ucs2le, eol_typep);
return &charset_ucs2le;
}
if (maxc[1] > 'a' && maxc[0] < 0x2f && maxc[3] > 'a' && maxc[2] < 0x2f) {
detect_eol_type(buf, size, &charset_ucs2be, eol_typep);
return &charset_ucs2be;
}
}
#else
if (charset_ucs4le.probe_func(&charset_ucs4le, buf, size))
return detect_eol_type(buf, size, &charset_ucs4le, eol_typep);
else
if (charset_ucs4be.probe_func(&charset_ucs4be, buf, size))
return detect_eol_type(buf, size, &charset_ucs4be, eol_typep);
else
if (charset_ucs2le.probe_func(&charset_ucs2le, buf, size))
return detect_eol_type(buf, size, &charset_ucs2le, eol_typep);
else
if (charset_ucs2be.probe_func(&charset_ucs2be, buf, size))
return detect_eol_type(buf, size, &charset_ucs2be, eol_typep);
#endif
/* Should detect iso-2220-jp upon \033$@ and \033$B, but jis
* support is not selected in tiny build
* XXX: should use charset probe functions.
*/
if (bits & HAS_BINARY) {
*eol_typep = EOL_UNIX;
return &charset_raw;
}
detect_eol_type(buf, size, &charset_raw, eol_typep);
#ifndef CONFIG_TINY
if (*eol_typep == EOL_MAC) {
/* XXX: default MAC files to Mac_roman, should be selectable */
/* XXX: should use probe functions */
return &charset_mac_roman;
}
#endif
if (*eol_typep == EOL_DOS
|| (bits & (TRAILING_BYTES | INVALID_PREFIX | INVALID_SEQUENCE))) {
/* XXX: default DOS files to Latin1, should be selectable */
return &charset_8859_1;
}
/* XXX: should use a state variable for default charset */
return &charset_utf8;
#endif
}
/********************************************************/
/* 8 bit charsets */
void decode_8bit_init(CharsetDecodeState *s)
{
QECharset *charset = s->charset;
unsigned short *table;
int i, n;
table = unconst(unsigned short *)s->table; /* remove const qualifier */
for (i = 0; i < charset->min_char; i++)
*table++ = i;
n = charset->max_char - charset->min_char + 1;
for (i = 0; i < n; i++)
*table++ = charset->private_table[i];
for (i = charset->max_char + 1; i < 256; i++)
*table++ = i;
}
char32_t decode_8bit(CharsetDecodeState *s)
{
return s->table[*(s->p)++];
}
/* not very fast, but not critical yet */
u8 *encode_8bit(QECharset *charset, u8 *q, char32_t c)
{
int i, n;
const unsigned short *table;
if (c < charset->min_char) {
/* nothing to do */
} else
if (c > charset->max_char && c <= 0xff) {
/* nothing to do */
} else {
n = charset->max_char - charset->min_char + 1;
table = charset->private_table;
for (i = 0; i < n; i++) {
if (table[i] == c)
goto found;
}
return NULL;
found:
c = charset->min_char + i;
}
*q++ = c;
return q;
}
/* return the number of lines and column position for a buffer */
void charset_get_pos_8bit(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;
if (s->eol_type == EOL_DOS && p < p1 && *p == '\n') {
/* Skip \n at start of buffer.
* Should check for pending skip state */
p++;
lp++;
}
for (;;) {
p = memchr(p, nl, p1 - p);
if (!p)
break;
p++;
if (s->eol_type == EOL_DOS && p < p1 && *p == '\n')
p++;
lp = p;
line++;
}
col = p1 - lp;
*line_ptr = line;
*col_ptr = col;
}
int charset_goto_line_8bit(CharsetDecodeState *s,
const u8 *buf, int size, int nlines)
{
const u8 *p, *p1, *lp;
int nl;
lp = p = buf;
p1 = p + size;
nl = s->eol_char;
if (s->eol_type == EOL_DOS && p < p1 && *p == '\n') {
/* Skip \n at start of buffer.
* Should check for pending skip state */
p++;
lp++;
}
while (nlines > 0) {
p = memchr(p, nl, p1 - p);
if (!p)
break;
p++;
if (s->eol_type == EOL_DOS && p < p1 && *p == '\n')
p++;
lp = p;
nlines--;
}
return lp - buf;
}
int charset_get_chars_8bit(CharsetDecodeState *s,
const u8 *buf, int size)
{
int count = size;
const u8 *buf_end, *buf_ptr;
if (s->eol_type != EOL_DOS)
return count;
buf_ptr = buf;
buf_end = buf_ptr + count;
while (buf_ptr < buf_end) {
if (*buf_ptr++ == '\n') {
/* ignore \n in EOL_DOS scan, but count \r. (see above) */
count--;
}
}
return count;
}
int charset_goto_char_8bit(CharsetDecodeState *s,
const u8 *buf, int size, int pos)
{
int nb_chars;
const u8 *buf_ptr, *buf_end;
if (s->eol_type != EOL_DOS)
return min_offset(pos, size);
nb_chars = 0;
buf_ptr = buf;
buf_end = buf_ptr + size;
for (; buf_ptr < buf_end; buf_ptr++) {
if (*buf_ptr == '\n') {
/* ignore \n in EOL_DOS scan, but count \r. */
continue;
}
if (nb_chars >= pos)
break;
nb_chars++;
}
return buf_ptr - buf;
}
/********************************************************/
void charset_init(struct QEmacsState *qs) {
qe_register_charset(qs, &charset_raw);
qe_register_charset(qs, &charset_8859_1);
qe_register_charset(qs, &charset_vt100);
qe_register_charset(qs, &charset_7bit);
qe_register_charset(qs, &charset_utf8);
qe_register_charset(qs, &charset_utf8x);
qe_register_charset(qs, &charset_ucs2le);
qe_register_charset(qs, &charset_ucs2be);
qe_register_charset(qs, &charset_ucs4le);
qe_register_charset(qs, &charset_ucs4be);
}
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