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encoding stuff

This commit is contained in:
Vítor Santos Costa 2016-02-19 19:36:11 +00:00
parent b27c1964bf
commit bc71e54f20
6 changed files with 297 additions and 153 deletions
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4
H/YapGFlagInfo.h
View File

@ -181,12 +181,12 @@ original program path.
YAP_FLAG(FAST_FLAG, "fast", true, booleanFlag, "false", NULL), /**< `fast `
If `on` allow fast machine code, if `off` (default) disable it. Only
available in experimental implemexbntations.
available in experimental implementations.
*/
YAP_FLAG(FILE_NAME_VARIABLES_FLAG, "file_name_variables", true, booleanFlag,
"true", NULL),
YAP_FLAG(FLOAT_FORMAT_FLAG, "float_format", true, isatom, "%15e",
NULL), /**< + `float_format `
NULL), /**< + `float_format `
C-library `printf()` format specification used by write/1 and
friends to determine how floating point numbers are printed. The

5
H/YapText.h
View File

@ -266,9 +266,8 @@ inline static int cmpn_utf8(const utf8proc_uint8_t *pt1,
// UTF16
#define LEAD_OFFSET (0xD800 - (0x10000 >> 10))
#define SURROGATE_OFFSET ( 0x10000 - (0xD800 << 10) - 0xDC00 )
#define LEAD_OFFSET ((uint32_t)0xD800 - (uint32_t)(0x10000 >> 10))
#define SURROGATE_OFFSET ( (uint32_t)0x10000 - (uint32_t)(0xD800 << 10) - (uint32_t)0xDC00 )
const char *Yap_tokRep(TokEntry *tokptr);

190
docs/syntax.md
View File

@ -1,12 +1,17 @@
@file syntax.md
@defgroup YAPSyntax YAP Syntax
@ingroup mainpage
We will describe the syntax of YAP at two levels. We first will
describe the syntax for Prolog terms. In a second level we describe
the \a tokens from which Prolog \a terms are
the tokens from which Prolog terms are
built.
@section Formal_Syntax Syntax of Terms
@defgroup Formal_Syntax Syntax of Terms
@ingroup YAPSyntax
Below, we describe the syntax of YAP terms from the different
classes of tokens defined above. The formalism used will be <em>BNF</em>,
@ -81,15 +86,18 @@ dot with single quotes.
@section Tokens Prolog Tokens
# @defgroup Tokens Prolog Tokens
@ingroup YAPSyntax
Prolog tokens are grouped into the following categories:
@subsection Numbers Numbers
## @defgroup Numbers Numbers
@ingroup Tokens
Numbers can be further subdivided into integer and floating-point numbers.
@subsubsection Integers
### @defgroup Integers Integers
@ingroup Numbers
Integer numbers
are described by the following regular expression:
@ -136,7 +144,8 @@ the word size of the machine. This is 32 bits in most current machines,
but 64 in some others, such as the Alpha running Linux or Digital
Unix. The scanner will read larger or smaller integers erroneously.
@subsubsection Floats
### @defgroup Floats Floats
@ingroup Numbers
Floating-point numbers are described by:
@ -160,12 +169,13 @@ Examples:
Floating-point numbers are represented as a double in the target
machine. This is usually a 64-bit number.
@subsection Strings Character Strings
## Strings @defgroup Strings Character Strings
Strings are described by the following rules:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
string --> '"' string_quoted_characters '"'
~~~~
string --> " string_quoted_characters "
string --> ` string_quoted_characters `
string_quoted_characters --> '"' '"' string_quoted_characters
string_quoted_characters --> '\'
@ -177,10 +187,25 @@ Strings are described by the following rules:
escape_sequence --> '\' | '"' | ''' | '`'
escape_sequence --> at_most_3_octal_digit_seq_char '\'
escape_sequence --> 'x' at_most_2_hexa_digit_seq_char '\'
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
where `string_character` in any character except the double quote
~~~~
where `string_character` is any character except the double quote (back quote)
and escape characters.
YAP supports four different textual elements:
+ Atoms, mentioned above, are textual representations of symbols, that are interned in the
data-base. They are stored either in ISO-LATIN-1 (first 256 code points), or as UTF-32.
+ Strings are atomic representations of text. The back-quote character is used to identify these objects in the program. Strings exist as stack objects, in the same way as other Prolog terms. As Prolog unification cannot be used to manipulate strings, YAP includes built-ins such as string_arg/3, sub_string/5, or string_concat to manipulate them efficiently. Strings are stored as opaque objects containing a
+ Lists of codes represent text as a list of numbers, where each number is a character code. A string of _N_ bytes requires _N_ pairs, that is _2N_ cells, leading to a total of 16 bytes per character on 64 byte machines. Thus, they are a very expensive, but very flexible representation, as one can use unification to construct and access string elements.
+ Lists of atoms represent text as a list of atoms, where each number has a single character code. A string of _N_ bytes also requires _2N_ pairs. They have similar properties to lists of codes.
The flags `double_quotes` and `backquoted_string` change the interpretation of text strings, they can take the
values `atom`, `string`, `codes`, and `chars`.
Examples:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@ -188,9 +213,7 @@ Examples:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The first string is an empty string, the last string shows the use of
double-quoting. The implementation of YAP represents strings as
lists of integers. Since YAP 4.3.0 there is no static limit on string
size.
double-quoting.
Escape sequences can be used to include the non-printable characters
`a` (alert), `b` (backspace), `r` (carriage return),
@ -210,13 +233,14 @@ The first three examples return a list including only character 12 (form
feed). The last example escapes the escape character.
Escape sequences were not available in C-Prolog and in original
versions of YAP up to 4.2.0. Escape sequences can be disable by using:
versions of YAP up to 4.2.0. Escape sequences can be disabled by using:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:- yap_flag(character_escapes,false).
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@subsection Atoms Atoms
## @addgroup Atoms Atoms
@ingroup Tokens
Atoms are defined by one of the following rules:
@ -256,7 +280,8 @@ Version `4.2.0` of YAP removed the previous limit of 256
characters on an atom. Size of an atom is now only limited by the space
available in the system.
@subsection Variables Variables
## @addgroup Variables Variables
@ingroup Tokens
Variables are described by:
@ -276,8 +301,8 @@ variables are known as anonymous variables. Note that different
occurrences of `_` on the same term represent <em>different</em>
anonymous variables.
@subsection Punctuation_Tokens Punctuation Tokens
## @addgroup Punctuation_Tokens Punctuation Tokens
@ingroup Tokens
Punctuation tokens consist of one of the following characters:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@ -298,7 +323,9 @@ layout characters, the YAP parser behaves as if it had found a
single blank character. The end of a file also counts as a blank
character for this purpose.
@section Encoding Wide Character Support
## @addgroup WideChars Encoding Wide Character Support
@ingroup YAPSyntax
YAP now implements a SWI-Prolog compatible interface to wide
characters and the Universal Character Set (UCS). The following text
@ -319,7 +346,8 @@ atoms. If the text fits in ISO Latin-1, it is represented as an array
of 8-bit characters. Otherwise the text is represented as an array of
wide chars, which may take 16 or 32 bits. This representational issue
is completely transparent to the Prolog user. Users of the foreign
language interface sometimes need to be aware of these issues though.
language interface sometimes need to be aware of these issues though. Notice that this will likely
change in the future, we probably will use an UTF-8 based representation.
Character coding comes into view when characters of strings need to be
read from or written to file or when they have to be communicated to
@ -327,76 +355,105 @@ other software components using the foreign language interface. In this
section we only deal with I/O through streams, which includes file I/O
as well as I/O through network sockets.
@subsection Stream_Encoding Wide character encodings on streams
== @addgroup Stream_Encoding Wide character encodings on streams
@ingroup WideChars
Although characters are uniquely coded using the UCS standard
internally, streams and files are byte (8-bit) oriented and there are a
variety of ways to represent the larger UCS codes in an 8-bit octet
stream. The most popular one, especially in the context of the web, is
UTF-8. Bytes 0...127 represent simply the corresponding US-ASCII
The UCS standard describes all possible characters (or code points, as they include
ideograms, ligatures, and other symbols). The current version, Unicode 8.0, allows
code points up to 0x10FFFF, and thus allows for 1,114,112 code points. See [Unicode Charts](http://unicode.org/charts/) for the supported languages.
Notice that most symbols are rarely used. Encodings represent the Unicode characters in a way
that is more suited for communication. The most popular encoding, especially in the context of the web and in the Unix/Linux/BSD/Mac communities, is
UTF-8. UTF-8 is compact and as it uses bytes, does not have different endianesses.
Bytes 0...127 represent simply the corresponding US-ASCII
character, while bytes 128...255 are used for multi-byte
encoding of characters placed higher in the UCS space. Especially on
MS-Windows the 16-bit Unicode standard, represented by pairs of bytes is
also popular.
encoding of characters placed higher in the UCS space.
Prolog I/O streams have a property called <em>encoding</em> which
specifies the used encoding that influence `get_code/2` and
`put_code/2` as well as all the other text I/O predicates.
The default encoding for files is derived from the Prolog flag
`encoding`, which is initialised from the environment. If the
Especially on
MS-Windows and Java the 16-bit Unicode standard, represented by pairs of bytes is
also popular. Originally, Microsoft supported a UCS-2 with 16 bits that
could represent only up to 64k characters. This was later extended to support the full
Unicode, we will call the latter version UTF-16. The extension uses a hole in the first 64K code points. Characters above 0xFFFF are divided into two 2-byte words, each one in that hole. There are two versions of UTF-16: big and low
endian. By default, UTF-16 is big endian, in practice most often it is used on Intel
hardware that is naturally little endian.
UTF-32, often called UCS-4, provides a natural interface where a code point is coded as
four octets. Unfortunately, it is also more expensive, so it is not as widely used.
Last, other encodings are also commonly used. One such legacy encoding is ISO-LATIN-1, that
supported latin based languages in western europe. YAP currently uses either ISO-LATIN-1 or UTF-32
internally.
Prolog supports the default encoding used by the Operating System,
Namely, YAP checks the variables LANG, LC_ALL and LC_TYPE. Say, if at boot YAP detects that the
environment variable `LANG` ends in "UTF-8", this encoding is
assumed. Otherwise the default is `text` and the translation is
assumed. Otherwise, the default is `text` and the translation is
left to the wide-character functions of the C-library (note that the
Prolog native UTF-8 mode is considerably faster than the generic
`mbrtowc()` one). The encoding can be specified explicitly in
`mbrtowc()` one).
Prolog allows the encoding to be specified explicitly in
load_files/2 for loading Prolog source with an alternative
encoding, `open/4` when opening files or using `set_stream/2` on
any open stream (not yet implemented). For Prolog source files we also
provide the `encoding/1` directive that can be used to switch
between encodings that are compatible to US-ASCII (`ascii`,
`iso_latin_1`, `utf8` and many locales).
`iso_latin_1`, `utf8` and many locales).
For
additional information and Unicode resources, please visit
<http://www.unicode.org/>.
additional information and Unicode resources, please visit the
[unicode](http://www.unicode.org/) organization web page.
YAP currently defines and supports the following encodings:
+ octet
+ `octet`
Default encoding for <em>binary</em> streams. This causes
the stream to be read and written fully untranslated.
+ ascii
+ `ascii` or `US_ASCII`
7-bit encoding in 8-bit bytes. Equivalent to `iso_latin_1`,
but generates errors and warnings on encountering values above
127.
+ iso_latin_1
+ `iso_latin_1` or `ISO-8859-1`
8-bit encoding supporting many western languages. This causes
the stream to be read and written fully untranslated.
+ text
+ `text`
C-library default locale encoding for text files. Files are read and
written using the C-library functions `mbrtowc()` and
`wcrtomb()`. This may be the same as one of the other locales,
notably it may be the same as `iso_latin_1` for western
languages and `utf8` in a UTF-8 context.
+ utf8
Multi-byte encoding of full UCS, compatible to `ascii`.
+ `utf8`, `iso_utf8`, or `UTF-8``
Multi-byte encoding of the full Unicode 8, compatible to `ascii` .
See above.
+ unicode_be
+ `unicode_be` or `UCS-2BE`
Unicode Big Endian. Reads input in pairs of bytes, most
significant byte first. Can only represent 16-bit characters.
+ unicode_le
+ `unicode_le` or `UCS-2LE`
Unicode Little Endian. Reads input in pairs of bytes, least
significant byte first. Can only represent 16-bit characters.
+ `utf16_le` or `UTF-16LE` (experimental)
UTF-16 Little Endian. Reads input in pairs of bytes, least
significant byte first. Can represent the full Unicode.
+ `utf16_le` or `UTF-16BE` (experimental)
Unicode Big Endian. Reads input in pairs of bytes, least
significant byte first. Can represent the full Unicode.
+ `utf32_le` or `UTF-32LE` (experimental)
UTF-16 Little Endian. Reads input in pairs of bytes, least
significant byte first. Can represent the full Unicode.
+ `utf32_le` or `UTF-32BE` (experimental)
Unicode Big Endian. Reads input in pairs of bytes, least
significant byte first. Can only represent 16-bit characters.
Note that not all encodings can represent all characters. This implies
that writing text to a stream may cause errors because the stream
@ -405,34 +462,31 @@ errors can be controlled using `open/4` or `set_stream/2` (not
implemented). Initially the terminal stream write the characters using
Prolog escape sequences while other streams generate an I/O exception.
@subsection BOM BOM: Byte Order Mark
=== @addgroup BOM BOM: Byte Order Mark
@ingroup WideChars
From Stream Encoding, you may have got the impression that
text-files are complicated. This section deals with a related topic,
making live often easier for the user, but providing another worry to
the programmer. *BOM* or <em>Byte Order Marker</em> is a technique
for identifying Unicode text-files as well as the encoding they
use. Such files start with the Unicode character `0xFEFF`, a
non-breaking, zero-width space character. This is a pretty unique
sequence that is not likely to be the start of a non-Unicode file and
uniquely distinguishes the various Unicode file formats. As it is a
zero-width blank, it even doesn't produce any output. This solves all
problems, or ...
use. Please read the [W3C](https://www.w3.org/International/questions/qa-byte-order-mark.en.php]
page for a detailed explanation of byte-order marks.
Some formats start of as US-ASCII and may contain some encoding mark to
switch to UTF-8, such as the `encoding="UTF-8"` in an XML header.
Such formats often explicitly forbid the the use of a UTF-8 BOM. In
other cases there is additional information telling the encoding making
the use of a BOM redundant or even illegal.
The BOM is handled by the `open/4` predicate. By default, text-files are
BOMa are necessary on multi-byte encodings, such as UTF-16 and UTF-32. There is a BOM for UTF-8, but it is rarely used.
The BOM is handled by the open/4 predicate. By default, text-files are
probed for the BOM when opened for reading. If a BOM is found, the
encoding is set accordingly and the property `bom(true)` is
available through stream_property/2. When opening a file for
writing, writing a BOM can be requested using the option
`bom(true)` with `open/4`.
@subsection Operators Summary of YAP Predefined Operators
`bom(true)` with `open/4`. Do notice that YAP will write a BOM by default on UTF-16 (including UCS-2) and
UTF-32; otherwise the default is not to write a BOM. BOMs are not avaliable for ASCII and
ISO-LATIN-1.
= @addgroup Operators Summary of YAP Predefined Operators
@ingroup YapSyntax
The Prolog syntax caters for operators of three main kinds:

59
os/charsio.c
View File

@ -98,7 +98,7 @@ Int Yap_peek(int sno) {
CACHE_REGS
Int ocharcount, olinecount, olinepos;
StreamDesc *s;
Int ch;
uint32_t ch;
s = GLOBAL_Stream + sno;
#if USE_READLINE
@ -141,41 +141,50 @@ Int Yap_peek(int sno) {
} else if (s->encoding == ENC_UTF16_BE) {
/* do the ungetc as if a write .. */
// computations
int lead = LEAD_OFFSET + (ch >> 10);
int trail = 0xDC00 + (ch & 0x3FF);
if (lead) {
ungetc(lead / 256, s->file);
ungetc(lead % 256, s->file);
}
ungetc(trail / 256, s->file);
ungetc(trail % 256, s->file);
} else if (s->encoding == ENC_UTF16_LE) {
/* do the ungetc as if a write .. */
// computations
if (ch < 0x10000) {
ungetc(ch % 256, s->file);
ungetc(ch / 256, s->file);
} else {
uint16_t lead = LEAD_OFFSET + (ch >> 10);
uint16_t trail = 0xDC00 + (ch & 0x3FF);
lead = 0;
trail = ch;
if (lead) {
ungetc(lead / 256, s->file);
ungetc(lead % 256, s->file);
}
if (trail) {
ungetc(trail / 256, s->file);
ungetc(trail % 256, s->file);
ungetc(lead % 256, s->file);
ungetc(lead / 256, s->file);
ungetc(trail % 256, s->file);
ungetc(trail / 256, s->file);
}
} else if (s->encoding == ENC_UTF16_LE) {
if (ch < 0x10000) {
ungetc(ch / 256, s->file);
ungetc(ch % 256, s->file);
} else {
uint16_t lead = LEAD_OFFSET + (ch >> 10);
uint16_t trail = 0xDC00 + (ch & 0x3FF);
ungetc(trail / 256, s->file);
ungetc(trail % 256, s->file);
ungetc(lead / 256, s->file);
ungetc(lead % 256, s->file);
}
} else if (s->encoding == ENC_ISO_UTF32_LE) {
ungetc( (ch >> 24) & 0xff, s->file);
ungetc( (ch >> 16) & 0xff, s->file);
ungetc( (ch >> 8) & 0xff, s->file);
return ungetc( ch & 0xff, s->file);
ungetc( ch & 0xff, s->file);
} else if (s->encoding == ENC_ISO_UTF32_BE) {
ungetc( ch & 0xff, s->file);
ungetc( (ch >> 8) & 0xff, s->file);
ungetc( (ch >> 16) & 0xff, s->file);
return ungetc( (ch >> 24) & 0xff, s->file);
}
ungetc( (ch >> 24) & 0xff, s->file);
} else if (s->encoding == ENC_UCS2_BE) {
/* do the ungetc as if a write .. */
// computations
ungetc(ch % 256, s->file);
ungetc(ch / 256, s->file);
} else if (s->encoding == ENC_UCS2_LE) {
ungetc(ch / 256, s->file);
ungetc(ch % 256, s->file);
}
return ch;
}

25
os/encoding.h
View File

@ -29,6 +29,8 @@ typedef enum {
ENC_UTF16_LE = 32, /// People who made the same mistake
ENC_ISO_UTF32_BE = 64, /// nobody
ENC_ISO_UTF32_LE = 128, /// yes, nobody
ENC_UCS2_BE = 256, /// nobody
ENC_UCS2_LE = 512, /// yes, nobody
} encoding_t;
#if WORDS_BIGENDIAN
@ -52,7 +54,7 @@ typedef enum {
SEQ_ENC_ISO_UTF8, /// Most everyone nowadays
SEQ_ENC_UTF16_BE, /// People who made a mistake
SEQ_ENC_UTF16_LE, /// People who made the same mistake
v\ SEQ_ENC_ISO_UTF32_BE, /// nobody
SEQ_ENC_ISO_UTF32_BE, /// nobody
SEQ_ENC_ISO_UTF32_LE /// yes, nobody
} seq_encoding_t;
@ -105,6 +107,10 @@ static inline const char *enc_name(encoding_t enc) {
return "utf16_be";
case ENC_UTF16_LE:
return "utf16_le";
case ENC_UCS2_BE:
return "ucs2_be";
case ENC_UCS2_LE:
return "ucs2_le";
case ENC_ISO_UTF32_BE:
return "utf32_be";
case ENC_ISO_UTF32_LE:
@ -133,7 +139,7 @@ static inline encoding_t enc_id(const char *s, encoding_t enc_bom) {
}
if (!strcmp(s, "UTF-16LE"))
return ENC_UTF16_LE;
if (!strcmp(s, "UTF16-BE"))
if (!strcmp(s, "UTF-16BE"))
return ENC_UTF16_BE;
if (!strcmp(s, "octet"))
return ENC_OCTET;
@ -158,12 +164,23 @@ static inline encoding_t enc_id(const char *s, encoding_t enc_bom) {
return ENC_ISO_UTF32_LE;
if (!strcmp(s, "ISO-8859-1"))
return ENC_ISO_LATIN1;
if (!strcmp(s, "US_ASCII"))
return ENC_ISO_ASCII;
// just for SWI compat, this actually refers to
// UCS-2
if (!strcmp(s, "unicode_be"))
return ENC_UTF16_BE;
return ENC_UCS2_BE;
if (!strcmp(s, "unicode_le"))
return ENC_UTF16_LE;
return ENC_UCS2_LE;
if (!strcmp(s, "UCS-2")) {
if (enc_bom == ENC_UTF16_LE)
return ENC_UCS2_LE;
return ENC_UCS2_BE;
}
if (!strcmp(s, "UCS-2LE"))
return ENC_UCS2_LE;
if (!strcmp(s, "UCS-2BE"))
return ENC_UCS2_BE;
if (!strcmp(s, "default")) {
if (enc_bom != ENC_OCTET)
return enc_bom;

167
os/iopreds.c
View File

@ -814,7 +814,7 @@ case ENC_UTF16_LE: // check http://unicode.org/faq/utf_bom.html#utf16-3
if (c1 == -1)
return post_process_weof(st);
wch = (c1 << 8) + ch;
if (wch >= 0xEFFF) {
if (wch >= 0xd800 && wch < 0xdc00) {
int c2 = st->stream_getc(sno);
if (c2 == -1)
return post_process_weof(st);
@ -826,6 +826,7 @@ case ENC_UTF16_LE: // check http://unicode.org/faq/utf_bom.html#utf16-3
return wch;
}
case ENC_UTF16_BE: // check http://unicode.org/faq/utf_bom.html#utf16-3
// little-endian: start with big shot
{
@ -834,7 +835,7 @@ case ENC_UTF16_BE: // check http://unicode.org/faq/utf_bom.html#utf16-3
if (c1 == -1)
return post_process_weof(st);
wch = (c1) + (ch<<8);
if (wch >= 0xEFFF) {
if (wch >= 0xd800 && wch < 0xdc00) {
int c3 = st->stream_getc(sno);
if (c3 == -1)
return post_process_weof(st);
@ -845,6 +846,31 @@ case ENC_UTF16_BE: // check http://unicode.org/faq/utf_bom.html#utf16-3
}
return wch;
}
case ENC_UCS2_BE: // check http://unicode.org/faq/utf_bom.html#utf16-3
// little-endian: start with big shot
{
int wch;
int c1 = st->stream_getc(sno);
if (c1 == -1)
return post_process_weof(st);
wch = (c1) + (ch<<8);
return wch;
}
case ENC_UCS2_LE: // check http://unicode.org/faq/utf_bom.html#utf16-3
// little-endian: start with big shot
{
int wch;
int c1 = st->stream_getc(sno);
if (c1 == -1)
return post_process_weof(st);
wch = (c1 << 8) + ch;
return wch;
}
case ENC_ISO_UTF32_BE: // check http://unicode.org/faq/utf_bom.html#utf16-3
// little-endian: start with big shot
{
@ -977,64 +1003,94 @@ case ENC_ISO_UTF32_LE: // check http://unicode.org/faq/utf_bom.html#utf16-3
}
case ENC_ISO_UTF8:
if (ch < 0x80) {
return GLOBAL_Stream[sno].stream_putc(sno, ch);
GLOBAL_Stream[sno].stream_putc(sno, ch);
} else if (ch < 0x800) {
GLOBAL_Stream[sno].stream_putc(sno, 0xC0 | ch >> 6);
return GLOBAL_Stream[sno].stream_putc(sno, 0x80 | (ch & 0x3F));
GLOBAL_Stream[sno].stream_putc(sno, 0x80 | (ch & 0x3F));
} else if (ch < 0x10000) {
GLOBAL_Stream[sno].stream_putc(sno, 0xE0 | ch >> 12);
GLOBAL_Stream[sno].stream_putc(sno, 0x80 | (ch >> 6 & 0x3F));
return GLOBAL_Stream[sno].stream_putc(sno, 0x80 | (ch & 0x3F));
GLOBAL_Stream[sno].stream_putc(sno, 0x80 | (ch & 0x3F));
} else if (ch < 0x200000) {
GLOBAL_Stream[sno].stream_putc(sno, 0xF0 | ch >> 18);
GLOBAL_Stream[sno].stream_putc(sno, 0x80 | (ch >> 12 & 0x3F));
GLOBAL_Stream[sno].stream_putc(sno, 0x80 | (ch >> 6 & 0x3F));
return GLOBAL_Stream[sno].stream_putc(sno, 0x80 | (ch & 0x3F));
GLOBAL_Stream[sno].stream_putc(sno, 0x80 | (ch & 0x3F));
} else {
/* should never happen */
return -1;
}
return ch;
break;
case ENC_UTF16_LE:
{
if (ch < 0x10000) {
GLOBAL_Stream[sno].stream_putc(sno, (ch & 0xff));
GLOBAL_Stream[sno].stream_putc(sno, (ch >> 8));
} else {
// computations
uint16_t ich = ch;
uint16_t lead = LEAD_OFFSET + (ich >> 10);
uint16_t trail = 0xDC00 + (ich & 0x3FF);
GLOBAL_Stream[sno].stream_putc(sno, (trail & 0xff));
GLOBAL_Stream[sno].stream_putc(sno, (trail >> 8));
GLOBAL_Stream[sno].stream_putc(sno, (lead & 0xff));
GLOBAL_Stream[sno].stream_putc(sno, (lead >> 8));
}
return ch;
}
case ENC_UTF16_BE:
{
// computations
int lead = LEAD_OFFSET + (ch >> 10);
int trail = 0xDC00 + (ch & 0x3FF);
if (ch < 0x10000) {
GLOBAL_Stream[sno].stream_putc(sno, (ch >> 8));
GLOBAL_Stream[sno].stream_putc(sno, (ch & 0xff));
} else {
uint16_t lead = (uint16_t)LEAD_OFFSET + ((uint16_t)ch >> 10);
uint16_t trail = 0xDC00 + ((uint16_t)ch & 0x3FF);
GLOBAL_Stream[sno].stream_putc(sno, (trail & 0xff));
GLOBAL_Stream[sno].stream_putc(sno, (trail >> 8));
if (trail) {
GLOBAL_Stream[sno].stream_putc(sno, (lead & 0xff));
GLOBAL_Stream[sno].stream_putc(sno, (lead >> 8));
}
return lead >> 8;
}
case ENC_UTF16_LE:
{
// computations
int lead = LEAD_OFFSET + (ch >> 10);
int trail = 0xDC00 + (ch & 0x3FF);
if (lead) {
GLOBAL_Stream[sno].stream_putc(sno, (lead >> 8));
GLOBAL_Stream[sno].stream_putc(sno, (lead & 0xff));
}
GLOBAL_Stream[sno].stream_putc(sno, (lead & 0xff));
GLOBAL_Stream[sno].stream_putc(sno, (trail >> 8));
GLOBAL_Stream[sno].stream_putc(sno, (trail & 0xff));
return lead >> 8;
}
case ENC_ISO_UTF32_LE:
return ch;
}
case ENC_UCS2_LE:
{
if (ch >= 0x10000) {
return 0;
}
GLOBAL_Stream[sno].stream_putc(sno, (ch & 0xff));
GLOBAL_Stream[sno].stream_putc(sno, (ch >> 8));
return ch;
}
case ENC_UCS2_BE:
{
// computations
if (ch < 0x10000) {
GLOBAL_Stream[sno].stream_putc(sno, (ch >> 8));
GLOBAL_Stream[sno].stream_putc(sno, (ch & 0xff));
return ch;
} else {
return 0;
}
}
case ENC_ISO_UTF32_BE:
GLOBAL_Stream[sno].stream_putc(sno, (ch >> 24) & 0xff);
GLOBAL_Stream[sno].stream_putc(sno, (ch >> 16) & 0xff);
GLOBAL_Stream[sno].stream_putc(sno, (ch >> 8) & 0xff);
return GLOBAL_Stream[sno].stream_putc(sno, ch & 0xff);
case ENC_ISO_UTF32_BE:
GLOBAL_Stream[sno].stream_putc(sno, ch & 0xff);
return ch;
case ENC_ISO_UTF32_LE:
GLOBAL_Stream[sno].stream_putc(sno, ch & 0xff);
GLOBAL_Stream[sno].stream_putc(sno, (ch >> 8) & 0xff);
GLOBAL_Stream[sno].stream_putc(sno, (ch >> 16) & 0xff);
return GLOBAL_Stream[sno].stream_putc(sno, (ch >> 24) & 0xff);
GLOBAL_Stream[sno].stream_putc(sno, (ch >> 24) & 0xff);
return ch;
}
}
return -1;
@ -1105,45 +1161,53 @@ case ENC_ISO_UTF32_LE: // check http://unicode.org/faq/utf_bom.html#utf16-3
switch (st->encoding) {
case ENC_ISO_UTF8:
if (st->stream_putc(sno, 0xEF) < 0)
return FALSE;
return false;
if (st->stream_putc(sno, 0xBB) < 0)
return FALSE;
return false;
if (st->stream_putc(sno, 0xBF) < 0)
return FALSE;
return false;
st->status |= HAS_BOM_f;
return TRUE;
return true;
case ENC_UTF16_BE:
case ENC_UCS2_BE:
if (st->stream_putc(sno, 0xFE) < 0)
return FALSE;
return false;
if (st->stream_putc(sno, 0xFF) < 0)
return FALSE;
return false;
st->status |= HAS_BOM_f;
return TRUE;
return true;
case ENC_UTF16_LE:
case ENC_UCS2_LE:
if (st->stream_putc(sno, 0xFF) < 0)
return FALSE;
return false;
if (st->stream_putc(sno, 0xFE) < 0)
return FALSE;
case ENC_ISO_UTF32_BE:
return false;
st->status |= HAS_BOM_f;
return true;
case ENC_ISO_UTF32_BE:
if (st->stream_putc(sno, 0x00) < 0)
return FALSE;
return false;
if (st->stream_putc(sno, 0x00) < 0)
return FALSE;
return false;
if (st->stream_putc(sno, 0xFE) < 0)
return FALSE;
return false;
if (st->stream_putc(sno, 0xFF) < 0)
return FALSE;
return false;
st->status |= HAS_BOM_f;
return true;
case ENC_ISO_UTF32_LE:
if (st->stream_putc(sno, 0xFF) < 0)
return FALSE;
return false;
if (st->stream_putc(sno, 0xFE) < 0)
return FALSE;
return false;
if (st->stream_putc(sno, 0x00) < 0)
return FALSE;
return false;
if (st->stream_putc(sno, 0x00) < 0)
return FALSE;
return false;
st->status |= HAS_BOM_f;
return true;
default:
return TRUE;
return true;
}
}
@ -1471,6 +1535,7 @@ case ENC_ISO_UTF32_LE: // check http://unicode.org/faq/utf_bom.html#utf16-3
}
// BOM mess
if (encoding == ENC_UTF16_BE || encoding == ENC_UTF16_LE ||
encoding == ENC_UCS2_BE || encoding == ENC_UCS2_LE ||
encoding == ENC_ISO_UTF32_BE || encoding == ENC_ISO_UTF32_LE) {
needs_bom = true;
}