mirror of
https://github.com/rkd77/elinks.git
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faff6b9b63
Patch by sgerwk, slightly modified. Taken from Debian.
207 lines
7.7 KiB
C
207 lines
7.7 KiB
C
#ifndef EL__INTL_CHARSETS_H
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#define EL__INTL_CHARSETS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct hash;
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/* The TRE check in configure.ac assumes unicode_val_T is uint32_t. */
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typedef uint32_t unicode_val_T;
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/* U+0020 SPACE. Normally the same as ' ' or L' ' but perhaps ELinks
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* shouldn't rely on that. */
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#define UCS_SPACE ((unicode_val_T) 0x0020)
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/* U+00A0 NO-BREAK SPACE. */
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#define UCS_NO_BREAK_SPACE ((unicode_val_T) 0x00A0)
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/* U+00AD SOFT HYPHEN. */
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#define UCS_SOFT_HYPHEN ((unicode_val_T) 0x00AD)
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/* U+FFFD REPLACEMENT CHARACTER. Used when no Unicode mapping is
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* known for a byte in a codepage, or when invalid UTF-8 is received
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* from a terminal. After generating the character, ELinks then
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* treats it like any other Unicode character. The user can also type
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* this character directly, and it can occur in documents. */
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#define UCS_REPLACEMENT_CHARACTER ((unicode_val_T) 0xFFFD)
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/* A special value that fits in unicode_val_T but is outside the range
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* of Unicode characters. utf8_to_unicode and cp_to_unicode return
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* this if the input is too short. This is also used as a placeholder
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* for the second cell of a double-cell character. */
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#define UCS_NO_CHAR ((unicode_val_T) 0xFFFFFFFD)
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#ifdef CONFIG_COMBINE
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#define UCS_END_COMBINED ((unicode_val_T) 0xFFFFFFFC)
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#define UCS_BEGIN_COMBINED ((unicode_val_T) (UCS_END_COMBINED - (unicode_val_T) 10000))
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/* Base character and up to 5 combining characters. */
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#define UCS_MAX_LENGTH_COMBINED 6
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#endif /* CONFIG_COMBINE */
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/* If ELinks should display a double-cell character but there is only
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* one cell available, it displays this character instead. This must
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* be a single-cell character but need not be unique. Possible values
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* might be U+0020 SPACE or U+303F IDEOGRAPHIC HALF FILL SPACE.
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*
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* Some BFU widgets (at least input fields and list boxes) currently
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* ignore this setting and use U+0020 instead. (They first draw spaces
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* and then overwrite with text; look for utf8_cells2bytes calls.)
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* We should fix that if we ever change the value. */
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#define UCS_ORPHAN_CELL ((unicode_val_T) 0x20)
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/* replacement character. See u2cp().
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* UTF-8 strings should use the encoding of U+00A0 instead. */
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#define NBSP_CHAR ((unsigned char) 1)
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#define NBSP_CHAR_STRING "\001"
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/* How to convert a byte from a source charset. This is used in an
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* array (struct conv_table[256]) indexed by the byte value. */
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struct conv_table {
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/* 0 if this is the final byte of a character, or 1 if more
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* bytes are needed. */
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int t;
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union {
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/* If @t==0: a null-terminated string that is the
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* corresponding character in the target charset.
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* Normally, the string is statically allocated.
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* However, if the conversion table is to UTF-8, then
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* the strings in elements 0x80 to 0xFF are allocated
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* with @mem_alloc and owned by the table. */
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const char *str;
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/* If @t==1: a pointer to a nested conversion table
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* (with 256 elements) that describes how to convert
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* each possible subsequent byte. The conversion
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* table owns the nested conversion table. */
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struct conv_table *tbl;
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} u;
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int iconv_cp;
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};
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enum convert_string_mode {
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CSM_DEFAULT, /* Convert any char. */
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CSM_QUERY, /* Special handling of '&' and '=' chars. */
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CSM_FORM, /* Special handling of '&' and '=' chars in forms. */
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CSM_NONE, /* Convert nothing. */
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};
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/* How to translate U+00A0 NO-BREAK SPACE. If u2cp_ is converting to
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* UTF-8, it ignores this choice and just encodes the U+00A0. */
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enum nbsp_mode {
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/* Convert to NBSP_CHAR. This lets the HTML renderer
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* recognize nbsp even if the codepage doesn't support
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* nbsp. (VISCII doesn't.) */
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NBSP_MODE_HACK = 0,
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/* Convert to normal ASCII space. */
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NBSP_MODE_ASCII = 1
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};
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struct conv_table *get_translation_table(int, int);
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const char *get_entity_string(const char *str,
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const int strlen, int encoding);
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/* The convert_string() name is also used by Samba (version 3.0.3), which
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* provides libnss_wins.so.2, which is called somewhere inside
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* _nss_wins_gethostbyname_r(). This name clash causes the elinks hostname
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* lookup thread to crash so we need to rename the symbol. */
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/* Reported by Derek Poon and filed as bug 453 */
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#undef convert_string
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#define convert_string convert_string_elinks
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/* This routine converts a string from one charset to another according to the
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* passed @convert_table, potentially also decoding SGML (HTML) entities along
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* the way (according to @mode). It either returns dynamically allocated
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* converted string of length @length, or if the @callback is non-NULL it calls
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* it each few bytes instead and always returns NULL (@length is undefined).
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* Note that it's ok not to care and pass NULL as @length. */
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char *convert_string(struct conv_table *convert_table,
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const char *chars, int charslen, int cp,
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enum convert_string_mode mode, int *length,
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void (*callback)(void *data, char *buf, int buflen),
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void *callback_data);
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int get_cp_index(const char *);
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const char *get_cp_name(int);
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const char *get_cp_config_name(int);
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const char *get_cp_mime_name(int);
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const uint16_t *get_cp_highhalf(const char *);
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int is_cp_utf8(int);
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void free_conv_table(void);
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char *encode_utf8(unicode_val_T);
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#ifdef CONFIG_UTF8
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char *utf8_prevchar(char *, int, char *);
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int utf8charlen(const char *);
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int utf8_char2cells(const char *, char *);
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int utf8_ptr2cells(const char *, char *);
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int utf8_ptr2chars(char *, char *);
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int utf8_cells2bytes(const char *, int, char *);
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/* How utf8_step_forward and utf8_step_backward count steps. */
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enum utf8_step {
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/* Each step is one character, even if it is a combining or
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* double-width character. */
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UTF8_STEP_CHARACTERS,
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/* Each step is one cell. If the specified number of steps
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* would end in the middle of a double-width character, do not
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* include the character. */
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UTF8_STEP_CELLS_FEWER,
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/* Each step is one cell. If the specified number of steps
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* would end in the middle of a double-width character,
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* include the whole character. */
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UTF8_STEP_CELLS_MORE
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};
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char *utf8_step_forward(char *, char *,
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int, enum utf8_step, int *);
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char *utf8_step_backward(char *, char *,
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int, enum utf8_step, int *);
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int is_codepoint_supported(unicode_val_T u);
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int codepoint_replacement(unicode_val_T u);
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int unicode_to_cell(unicode_val_T);
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unicode_val_T unicode_fold_label_case(unicode_val_T);
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int strlen_utf8(char **);
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#endif /* CONFIG_UTF8 */
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unicode_val_T utf8_to_unicode(char **, const char *);
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unicode_val_T cp_to_unicode(int, char **, const char *);
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#ifdef CONFIG_COMBINE
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extern unicode_val_T last_combined;
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extern unicode_val_T **combined;
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extern struct hash *combined_hash;
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unicode_val_T get_combined(unicode_val_T *, int);
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void free_combined();
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#endif /* CONFIG_COMBINE */
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unicode_val_T cp2u(int, unsigned char);
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const char *cp2utf8(int, int);
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const char *u2cp_(unicode_val_T, int, enum nbsp_mode);
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#define u2cp(u, to) u2cp_(u, to, NBSP_MODE_HACK)
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#define u2cp_no_nbsp(u, to) u2cp_(u, to, NBSP_MODE_ASCII)
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void init_charsets_lookup(void);
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void free_charsets_lookup(void);
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/* UTF-16 encodes each Unicode character U+0000...U+FFFF as a single
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* 16-bit code unit, and each character U+10000...U+10FFFF as a pair
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* of two code units: a high surrogate followed by a low surrogate.
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* The range U+D800...U+DFFF is reserved for these surrogates. */
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#define is_utf16_surrogate(u) (((u) & 0xFFFFF800) == 0xD800)
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#define is_utf16_high_surrogate(u) (((u) & 0xFFFFFC00) == 0xD800)
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#define is_utf16_low_surrogate(u) (((u) & 0xFFFFFC00) == 0xDC00)
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#define join_utf16_surrogates(high,low) (0x10000 + (((high) - 0xD800L) << 10) + ((low) - 0xDC00))
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#define needs_utf16_surrogates(u) ((uint32_t) ((u) - 0x10000) < 0x100000)
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#define get_utf16_high_surrogate(u) (0xD800 + (((u) - 0x10000) >> 10))
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#define get_utf16_low_surrogate(u) (0xDC00 + ((u) & 0x3FF))
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#ifdef __cplusplus
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}
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#endif
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#endif
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