1237 lines
43 KiB
C
1237 lines
43 KiB
C
/*
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**********************************************************************
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* Copyright (C) 2000-2003, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* file name: ucnv_lmb.cpp
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* encoding: US-ASCII
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* tab size: 4 (not used)
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* indentation:4
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*
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* created on: 2000feb09
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* created by: Brendan Murray
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* extensively hacked up by: Jim Snyder-Grant
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*
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* Modification History:
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*
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* Date Name Description
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*
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* 06/20/2000 helena OS/400 port changes; mostly typecast.
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* 06/27/2000 Jim Snyder-Grant Deal with partial characters and small buffers.
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* Add comments to document LMBCS format and implementation
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* restructured order & breakdown of functions
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* 06/28/2000 helena Major rewrite for the callback API changes.
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_LEGACY_CONVERSION
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#include "cmemory.h"
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#include "unicode/ucnv_err.h"
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#include "ucnv_bld.h"
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#include "unicode/ucnv.h"
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#include "ucnv_cnv.h"
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/*
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LMBCS
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(Lotus Multi-Byte Character Set)
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LMBCS was invented in the late 1980's and is primarily used in Lotus Notes
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databases and in Lotus 1-2-3 files. Programmers who work with the APIs
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into these products will sometimes need to deal with strings in this format.
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The code in this file provides an implementation for an ICU converter of
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LMBCS to and from Unicode.
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Since the LMBCS character set is only sparsely documented in existing
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printed or online material, we have added extensive annotation to this
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file to serve as a guide to understanding LMBCS.
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LMBCS was originally designed with these four sometimes-competing design goals:
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-Provide encodings for the characters in 12 existing national standards
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(plus a few other characters)
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-Minimal memory footprint
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-Maximal speed of conversion into the existing national character sets
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-No need to track a changing state as you interpret a string.
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All of the national character sets LMBCS was trying to encode are 'ANSI'
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based, in that the bytes from 0x20 - 0x7F are almost exactly the
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same common Latin unaccented characters and symbols in all character sets.
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So, in order to help meet the speed & memory design goals, the common ANSI
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bytes from 0x20-0x7F are represented by the same single-byte values in LMBCS.
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The general LMBCS code unit is from 1-3 bytes. We can describe the 3 bytes as
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follows:
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[G] D1 [D2]
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That is, a sometimes-optional 'group' byte, followed by 1 and sometimes 2
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data bytes. The maximum size of a LMBCS chjaracter is 3 bytes:
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*/
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#define ULMBCS_CHARSIZE_MAX 3
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/*
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The single-byte values from 0x20 to 0x7F are examples of single D1 bytes.
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We often have to figure out if byte values are below or above this, so we
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use the ANSI nomenclature 'C0' and 'C1' to refer to the range of control
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characters just above & below the common lower-ANSI range */
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#define ULMBCS_C0END 0x1F
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#define ULMBCS_C1START 0x80
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/*
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Since LMBCS is always dealing in byte units. we create a local type here for
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dealing with these units of LMBCS code units:
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*/
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typedef uint8_t ulmbcs_byte_t;
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/*
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Most of the values less than 0x20 are reserved in LMBCS to announce
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which national character standard is being used for the 'D' bytes.
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In the comments we show the common name and the IBM character-set ID
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for these character-set announcers:
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*/
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#define ULMBCS_GRP_L1 0x01 /* Latin-1 :ibm-850 */
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#define ULMBCS_GRP_GR 0x02 /* Greek :ibm-851 */
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#define ULMBCS_GRP_HE 0x03 /* Hebrew :ibm-1255 */
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#define ULMBCS_GRP_AR 0x04 /* Arabic :ibm-1256 */
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#define ULMBCS_GRP_RU 0x05 /* Cyrillic :ibm-1251 */
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#define ULMBCS_GRP_L2 0x06 /* Latin-2 :ibm-852 */
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#define ULMBCS_GRP_TR 0x08 /* Turkish :ibm-1254 */
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#define ULMBCS_GRP_TH 0x0B /* Thai :ibm-874 */
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#define ULMBCS_GRP_JA 0x10 /* Japanese :ibm-943 */
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#define ULMBCS_GRP_KO 0x11 /* Korean :ibm-1261 */
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#define ULMBCS_GRP_TW 0x12 /* Chinese SC :ibm-950 */
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#define ULMBCS_GRP_CN 0x13 /* Chinese TC :ibm-1386 */
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/*
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So, the beginning of understanding LMBCS is that IF the first byte of a LMBCS
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character is one of those 12 values, you can interpret the remaining bytes of
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that character as coming from one of those character sets. Since the lower
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ANSI bytes already are represented in single bytes, using one of the character
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set announcers is used to announce a character that starts with a byte of
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0x80 or greater.
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The character sets are arranged so that the single byte sets all appear
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before the multi-byte character sets. When we need to tell whether a
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group byte is for a single byte char set or not we use this define: */
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#define ULMBCS_DOUBLEOPTGROUP_START 0x10
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/*
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However, to fully understand LMBCS, you must also understand a series of
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exceptions & optimizations made in service of the design goals.
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First, those of you who are character set mavens may have noticed that
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the 'double-byte' character sets are actually multi-byte character sets
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that can have 1 or two bytes, even in the upper-ascii range. To force
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each group byte to introduce a fixed-width encoding (to make it faster to
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count characters), we use a convention of doubling up on the group byte
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to introduce any single-byte character > 0x80 in an otherwise double-byte
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character set. So, for example, the LMBCS sequence x10 x10 xAE is the
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same as '0xAE' in the Japanese code page 943.
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Next, you will notice that the list of group bytes has some gaps.
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These are used in various ways.
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We reserve a few special single byte values for common control
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characters. These are in the same place as their ANSI eqivalents for speed.
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*/
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#define ULMBCS_HT 0x09 /* Fixed control char - Horizontal Tab */
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#define ULMBCS_LF 0x0A /* Fixed control char - Line Feed */
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#define ULMBCS_CR 0x0D /* Fixed control char - Carriage Return */
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/* Then, 1-2-3 reserved a special single-byte character to put at the
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beginning of internal 'system' range names: */
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#define ULMBCS_123SYSTEMRANGE 0x19
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/* Then we needed a place to put all the other ansi control characters
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that must be moved to different values because LMBCS reserves those
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values for other purposes. To represent the control characters, we start
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with a first byte of 0xF & add the control chaarcter value as the
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second byte */
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#define ULMBCS_GRP_CTRL 0x0F
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/* For the C0 controls (less than 0x20), we add 0x20 to preserve the
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useful doctrine that any byte less than 0x20 in a LMBCS char must be
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the first byte of a character:*/
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#define ULMBCS_CTRLOFFSET 0x20
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/*
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Where to put the characters that aren't part of any of the 12 national
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character sets? The first thing that was done, in the earlier years of
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LMBCS, was to use up the spaces of the form
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[G] D1,
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where 'G' was one of the single-byte character groups, and
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D1 was less than 0x80. These sequences are gathered together
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into a Lotus-invented doublebyte character set to represent a
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lot of stray values. Internally, in this implementation, we track this
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as group '0', as a place to tuck this exceptions list.*/
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#define ULMBCS_GRP_EXCEPT 0x00
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/*
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Finally, as the durability and usefulness of UNICODE became clear,
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LOTUS added a new group 0x14 to hold Unicode values not otherwise
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represented in LMBCS: */
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#define ULMBCS_GRP_UNICODE 0x14
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/* The two bytes appearing after a 0x14 are intrepreted as UFT-16 BE
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(Big-Endian) characters. The exception comes when the UTF16
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representation would have a zero as the second byte. In that case,
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'F6' is used in its place, and the bytes are swapped. (This prevents
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LMBCS from encoding any Unicode values of the form U+F6xx, but that's OK:
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0xF6xx is in the middle of the Private Use Area.)*/
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#define ULMBCS_UNICOMPATZERO 0xF6
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/* It is also useful in our code to have a constant for the size of
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a LMBCS char that holds a literal Unicode value */
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#define ULMBCS_UNICODE_SIZE 3
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/*
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To squish the LMBCS representations down even further, and to make
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translations even faster,sometimes the optimization group byte can be dropped
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from a LMBCS character. This is decided on a process-by-process basis. The
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group byte that is dropped is called the 'optimization group'.
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For Notes, the optimzation group is always 0x1.*/
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#define ULMBCS_DEFAULTOPTGROUP 0x1
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/* For 1-2-3 files, the optimzation group is stored in the header of the 1-2-3
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file.
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In any case, when using ICU, you either pass in the
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optimization group as part of the name of the converter (LMBCS-1, LMBCS-2,
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etc.). Using plain 'LMBCS' as the name of the converter will give you
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LMBCS-1.
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*** Implementation strategy ***
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Because of the extensive use of other character sets, the LMBCS converter
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keeps a mapping between optimization groups and IBM character sets, so that
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ICU converters can be created and used as needed. */
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static const char * const OptGroupByteToCPName[ULMBCS_CTRLOFFSET] = {
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/* 0x0000 */ "lmb-excp", /* internal home for the LOTUS exceptions list */
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/* 0x0001 */ "ibm-850",
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/* 0x0002 */ "ibm-851",
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/* 0x0003 */ "windows-1255",
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/* 0x0004 */ "windows-1256",
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/* 0x0005 */ "windows-1251",
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/* 0x0006 */ "ibm-852",
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/* 0x0007 */ NULL, /* Unused */
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/* 0x0008 */ "windows-1254",
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/* 0x0009 */ NULL, /* Control char HT */
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/* 0x000A */ NULL, /* Control char LF */
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/* 0x000B */ "windows-874",
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/* 0x000C */ NULL, /* Unused */
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/* 0x000D */ NULL, /* Control char CR */
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/* 0x000E */ NULL, /* Unused */
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/* 0x000F */ NULL, /* Control chars: 0x0F20 + C0/C1 character: algorithmic */
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/* 0x0010 */ "windows-932",
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/* 0x0011 */ "windows-949",
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/* 0x0012 */ "windows-950",
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/* 0x0013 */ "windows-936"
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/* The rest are null, including the 0x0014 Unicode compatibility region
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and 0x0019, the 1-2-3 system range control char */
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};
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/* As you can see, even though any byte below 0x20 could be an optimization
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byte, only those at 0x13 or below can map to an actual converter. To limit
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some loops and searches, we define a value for that last group converter:*/
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#define ULMBCS_GRP_LAST 0x13 /* last LMBCS group that has a converter */
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/* That's approximately all the data that's needed for translating
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LMBCS to Unicode.
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However, to translate Unicode to LMBCS, we need some more support.
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That's because there are often more than one possible mappings from a Unicode
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code point back into LMBCS. The first thing we do is look up into a table
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to figure out if there are more than one possible mappings. This table,
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arranged by Unicode values (including ranges) either lists which group
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to use, or says that it could go into one or more of the SBCS sets, or
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into one or more of the DBCS sets. (If the character exists in both DBCS &
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SBCS, the table will place it in the SBCS sets, to make the LMBCS code point
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length as small as possible. Here's the two special markers we use to indicate
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ambiguous mappings: */
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#define ULMBCS_AMBIGUOUS_SBCS 0x80 /* could fit in more than one
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LMBCS sbcs native encoding
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(example: most accented latin) */
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#define ULMBCS_AMBIGUOUS_MBCS 0x81 /* could fit in more than one
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LMBCS mbcs native encoding
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(example: Unihan) */
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/* And here's a simple way to see if a group falls in an appropriate range */
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#define ULMBCS_AMBIGUOUS_MATCH(agroup, xgroup) \
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((((agroup) == ULMBCS_AMBIGUOUS_SBCS) && \
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(xgroup) < ULMBCS_DOUBLEOPTGROUP_START) || \
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(((agroup) == ULMBCS_AMBIGUOUS_MBCS) && \
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(xgroup) >= ULMBCS_DOUBLEOPTGROUP_START))
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/* The table & some code to use it: */
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static const struct _UniLMBCSGrpMap
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{
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const UChar uniStartRange;
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const UChar uniEndRange;
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const ulmbcs_byte_t GrpType;
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} UniLMBCSGrpMap[]
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=
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{
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{0x0001, 0x001F, ULMBCS_GRP_CTRL},
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{0x0080, 0x009F, ULMBCS_GRP_CTRL},
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{0x00A0, 0x01CD, ULMBCS_AMBIGUOUS_SBCS},
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{0x01CE, 0x01CE, ULMBCS_GRP_TW },
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{0x01CF, 0x02B9, ULMBCS_AMBIGUOUS_SBCS},
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{0x02BA, 0x02BA, ULMBCS_GRP_CN},
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{0x02BC, 0x02C8, ULMBCS_AMBIGUOUS_SBCS},
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{0x02C9, 0x02D0, ULMBCS_AMBIGUOUS_MBCS},
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{0x02D8, 0x02DD, ULMBCS_AMBIGUOUS_SBCS},
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{0x0384, 0x03CE, ULMBCS_AMBIGUOUS_SBCS},
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{0x0400, 0x044E, ULMBCS_GRP_RU},
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{0x044F, 0x044F, ULMBCS_AMBIGUOUS_MBCS},
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{0x0450, 0x0491, ULMBCS_GRP_RU},
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{0x05B0, 0x05F2, ULMBCS_GRP_HE},
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{0x060C, 0x06AF, ULMBCS_GRP_AR},
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{0x0E01, 0x0E5B, ULMBCS_GRP_TH},
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{0x200C, 0x200F, ULMBCS_AMBIGUOUS_SBCS},
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{0x2010, 0x2010, ULMBCS_AMBIGUOUS_MBCS},
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{0x2013, 0x2015, ULMBCS_AMBIGUOUS_SBCS},
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{0x2016, 0x2016, ULMBCS_AMBIGUOUS_MBCS},
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{0x2017, 0x2024, ULMBCS_AMBIGUOUS_SBCS},
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{0x2025, 0x2025, ULMBCS_AMBIGUOUS_MBCS},
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{0x2026, 0x2026, ULMBCS_AMBIGUOUS_SBCS},
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{0x2027, 0x2027, ULMBCS_GRP_CN},
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{0x2030, 0x2033, ULMBCS_AMBIGUOUS_SBCS},
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{0x2035, 0x2035, ULMBCS_AMBIGUOUS_MBCS},
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{0x2039, 0x203A, ULMBCS_AMBIGUOUS_SBCS},
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{0x203B, 0x203B, ULMBCS_AMBIGUOUS_MBCS},
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{0x2074, 0x2074, ULMBCS_GRP_KO},
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{0x207F, 0x207F, ULMBCS_GRP_EXCEPT},
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{0x2081, 0x2084, ULMBCS_GRP_KO},
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{0x20A4, 0x20AC, ULMBCS_AMBIGUOUS_SBCS},
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{0x2103, 0x2109, ULMBCS_AMBIGUOUS_MBCS},
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{0x2111, 0x2126, ULMBCS_AMBIGUOUS_SBCS},
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{0x212B, 0x212B, ULMBCS_AMBIGUOUS_MBCS},
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{0x2135, 0x2135, ULMBCS_AMBIGUOUS_SBCS},
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{0x2153, 0x2154, ULMBCS_GRP_KO},
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{0x215B, 0x215E, ULMBCS_GRP_EXCEPT},
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{0x2160, 0x2179, ULMBCS_AMBIGUOUS_MBCS},
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{0x2190, 0x2195, ULMBCS_GRP_EXCEPT},
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{0x2196, 0x2199, ULMBCS_AMBIGUOUS_MBCS},
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{0x21A8, 0x21A8, ULMBCS_GRP_EXCEPT},
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{0x21B8, 0x21B9, ULMBCS_GRP_CN},
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{0x21D0, 0x21D5, ULMBCS_GRP_EXCEPT},
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{0x21E7, 0x21E7, ULMBCS_GRP_CN},
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{0x2200, 0x220B, ULMBCS_GRP_EXCEPT},
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{0x220F, 0x2215, ULMBCS_AMBIGUOUS_MBCS},
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{0x2219, 0x2220, ULMBCS_GRP_EXCEPT},
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{0x2223, 0x2228, ULMBCS_AMBIGUOUS_MBCS},
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{0x2229, 0x222B, ULMBCS_GRP_EXCEPT},
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{0x222C, 0x223D, ULMBCS_AMBIGUOUS_MBCS},
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{0x2245, 0x2248, ULMBCS_GRP_EXCEPT},
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{0x224C, 0x224C, ULMBCS_GRP_TW},
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{0x2252, 0x2252, ULMBCS_AMBIGUOUS_MBCS},
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{0x2260, 0x2265, ULMBCS_GRP_EXCEPT},
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{0x2266, 0x226F, ULMBCS_AMBIGUOUS_MBCS},
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{0x2282, 0x2297, ULMBCS_GRP_EXCEPT},
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{0x2299, 0x22BF, ULMBCS_AMBIGUOUS_MBCS},
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{0x22C0, 0x22C0, ULMBCS_GRP_EXCEPT},
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{0x2310, 0x2310, ULMBCS_GRP_EXCEPT},
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{0x2312, 0x2312, ULMBCS_AMBIGUOUS_MBCS},
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{0x2318, 0x2321, ULMBCS_GRP_EXCEPT},
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{0x2318, 0x2321, ULMBCS_GRP_CN},
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{0x2460, 0x24E9, ULMBCS_AMBIGUOUS_MBCS},
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{0x2500, 0x2500, ULMBCS_AMBIGUOUS_SBCS},
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{0x2501, 0x2501, ULMBCS_AMBIGUOUS_MBCS},
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{0x2502, 0x2502, ULMBCS_AMBIGUOUS_SBCS},
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{0x2503, 0x2503, ULMBCS_AMBIGUOUS_MBCS},
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{0x2504, 0x2505, ULMBCS_GRP_TW},
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{0x2506, 0x2665, ULMBCS_AMBIGUOUS_MBCS},
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{0x2666, 0x2666, ULMBCS_GRP_EXCEPT},
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{0x2666, 0x2666, ULMBCS_GRP_EXCEPT},
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{0x2667, 0x2E7F, ULMBCS_AMBIGUOUS_SBCS},
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{0x2E80, 0xF861, ULMBCS_AMBIGUOUS_MBCS},
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{0xF862, 0xF8FF, ULMBCS_GRP_EXCEPT},
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{0xF900, 0xFA2D, ULMBCS_AMBIGUOUS_MBCS},
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{0xFB00, 0xFEFF, ULMBCS_AMBIGUOUS_SBCS},
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{0xFF01, 0xFFEE, ULMBCS_AMBIGUOUS_MBCS},
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{0xFFFF, 0xFFFF, ULMBCS_GRP_UNICODE}
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};
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static ulmbcs_byte_t
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FindLMBCSUniRange(UChar uniChar)
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{
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const struct _UniLMBCSGrpMap * pTable = UniLMBCSGrpMap;
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while (uniChar > pTable->uniEndRange)
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{
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pTable++;
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}
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if (uniChar >= pTable->uniStartRange)
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{
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return pTable->GrpType;
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}
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return ULMBCS_GRP_UNICODE;
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}
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/*
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We also ask the creator of a converter to send in a preferred locale
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that we can use in resolving ambiguous mappings. They send the locale
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in as a string, and we map it, if possible, to one of the
|
|
LMBCS groups. We use this table, and the associated code, to
|
|
do the lookup: */
|
|
|
|
/**************************************************
|
|
This table maps locale ID's to LMBCS opt groups.
|
|
The default return is group 0x01. Note that for
|
|
performance reasons, the table is sorted in
|
|
increasing alphabetic order, with the notable
|
|
exception of zhTW. This is to force the check
|
|
for Traditonal Chinese before dropping back to
|
|
Simplified.
|
|
|
|
Note too that the Latin-1 groups have been
|
|
commented out because it's the default, and
|
|
this shortens the table, allowing a serial
|
|
search to go quickly.
|
|
*************************************************/
|
|
|
|
static const struct _LocaleLMBCSGrpMap
|
|
{
|
|
const char *LocaleID;
|
|
const ulmbcs_byte_t OptGroup;
|
|
} LocaleLMBCSGrpMap[] =
|
|
{
|
|
{"ar", ULMBCS_GRP_AR},
|
|
{"be", ULMBCS_GRP_RU},
|
|
{"bg", ULMBCS_GRP_L2},
|
|
/* {"ca", ULMBCS_GRP_L1}, */
|
|
{"cs", ULMBCS_GRP_L2},
|
|
/* {"da", ULMBCS_GRP_L1}, */
|
|
/* {"de", ULMBCS_GRP_L1}, */
|
|
{"el", ULMBCS_GRP_GR},
|
|
/* {"en", ULMBCS_GRP_L1}, */
|
|
/* {"es", ULMBCS_GRP_L1}, */
|
|
/* {"et", ULMBCS_GRP_L1}, */
|
|
/* {"fi", ULMBCS_GRP_L1}, */
|
|
/* {"fr", ULMBCS_GRP_L1}, */
|
|
{"he", ULMBCS_GRP_HE},
|
|
{"hu", ULMBCS_GRP_L2},
|
|
/* {"is", ULMBCS_GRP_L1}, */
|
|
/* {"it", ULMBCS_GRP_L1}, */
|
|
{"iw", ULMBCS_GRP_HE},
|
|
{"ja", ULMBCS_GRP_JA},
|
|
{"ko", ULMBCS_GRP_KO},
|
|
/* {"lt", ULMBCS_GRP_L1}, */
|
|
/* {"lv", ULMBCS_GRP_L1}, */
|
|
{"mk", ULMBCS_GRP_RU},
|
|
/* {"nl", ULMBCS_GRP_L1}, */
|
|
/* {"no", ULMBCS_GRP_L1}, */
|
|
{"pl", ULMBCS_GRP_L2},
|
|
/* {"pt", ULMBCS_GRP_L1}, */
|
|
{"ro", ULMBCS_GRP_L2},
|
|
{"ru", ULMBCS_GRP_RU},
|
|
{"sh", ULMBCS_GRP_L2},
|
|
{"sk", ULMBCS_GRP_L2},
|
|
{"sl", ULMBCS_GRP_L2},
|
|
{"sq", ULMBCS_GRP_L2},
|
|
{"sr", ULMBCS_GRP_RU},
|
|
/* {"sv", ULMBCS_GRP_L1}, */
|
|
{"th", ULMBCS_GRP_TH},
|
|
{"tr", ULMBCS_GRP_TR},
|
|
{"uk", ULMBCS_GRP_RU},
|
|
/* {"vi", ULMBCS_GRP_L1}, */
|
|
{"zhTW", ULMBCS_GRP_TW},
|
|
{"zh", ULMBCS_GRP_CN},
|
|
{NULL, ULMBCS_GRP_L1}
|
|
};
|
|
|
|
|
|
static ulmbcs_byte_t
|
|
FindLMBCSLocale(const char *LocaleID)
|
|
{
|
|
const struct _LocaleLMBCSGrpMap *pTable = LocaleLMBCSGrpMap;
|
|
|
|
if ((!LocaleID) || (!*LocaleID))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
while (pTable->LocaleID)
|
|
{
|
|
if (*pTable->LocaleID == *LocaleID) /* Check only first char for speed */
|
|
{
|
|
/* First char matches - check whole name, for entry-length */
|
|
if (strncmp(pTable->LocaleID, LocaleID, strlen(pTable->LocaleID)) == 0)
|
|
return pTable->OptGroup;
|
|
}
|
|
else
|
|
if (*pTable->LocaleID > *LocaleID) /* Sorted alphabetically - exit */
|
|
break;
|
|
pTable++;
|
|
}
|
|
return ULMBCS_GRP_L1;
|
|
}
|
|
|
|
|
|
/*
|
|
Before we get to the main body of code, here's how we hook up to the rest
|
|
of ICU. ICU converters are required to define a structure that includes
|
|
some function pointers, and some common data, in the style of a C++
|
|
vtable. There is also room in there for converter-specific data. LMBCS
|
|
uses that converter-specific data to keep track of the 12 subconverters
|
|
we use, the optimization group, and the group (if any) that matches the
|
|
locale. We have one structure instantiated for each of the 12 possible
|
|
optimization groups. To avoid typos & to avoid boring the reader, we
|
|
put the declarations of these structures and functions into macros. To see
|
|
the definitions of these structures, see unicode\ucnv_bld.h
|
|
*/
|
|
|
|
|
|
|
|
#define DECLARE_LMBCS_DATA(n) \
|
|
static const UConverterImpl _LMBCSImpl##n={\
|
|
UCNV_LMBCS_##n,\
|
|
NULL,NULL,\
|
|
_LMBCSOpen##n,\
|
|
_LMBCSClose,\
|
|
NULL,\
|
|
_LMBCSToUnicodeWithOffsets,\
|
|
_LMBCSToUnicodeWithOffsets,\
|
|
_LMBCSFromUnicode,\
|
|
_LMBCSFromUnicode,\
|
|
NULL,\
|
|
NULL,\
|
|
NULL,\
|
|
NULL,\
|
|
NULL,\
|
|
ucnv_getCompleteUnicodeSet\
|
|
};\
|
|
static const UConverterStaticData _LMBCSStaticData##n={\
|
|
sizeof(UConverterStaticData),\
|
|
"LMBCS-" #n,\
|
|
0, UCNV_IBM, UCNV_LMBCS_##n, 1, 2,\
|
|
{ 0x3f, 0, 0, 0 },1,FALSE,FALSE,0,0,{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0} \
|
|
};\
|
|
const UConverterSharedData _LMBCSData##n={\
|
|
sizeof(UConverterSharedData), ~((uint32_t) 0),\
|
|
NULL, NULL, &_LMBCSStaticData##n, FALSE, &_LMBCSImpl##n, \
|
|
0 \
|
|
};
|
|
|
|
/* The only function we needed to duplicate 12 times was the 'open'
|
|
function, which will do basically the same thing except set a different
|
|
optimization group. So, we put the common stuff into a worker function,
|
|
and set up another macro to stamp out the 12 open functions:*/
|
|
#define DEFINE_LMBCS_OPEN(n) \
|
|
static void \
|
|
_LMBCSOpen##n(UConverter* _this,const char* name,const char* locale,uint32_t options,UErrorCode* err) \
|
|
{ _LMBCSOpenWorker(_this, name,locale,options, err, n);}
|
|
|
|
|
|
|
|
/* Here's the open worker & the common close function */
|
|
static void
|
|
_LMBCSOpenWorker(UConverter* _this,
|
|
const char* name,
|
|
const char* locale,
|
|
uint32_t options,
|
|
UErrorCode* err,
|
|
ulmbcs_byte_t OptGroup
|
|
)
|
|
{
|
|
UConverterDataLMBCS * extraInfo = (UConverterDataLMBCS*)uprv_malloc (sizeof (UConverterDataLMBCS));
|
|
if(extraInfo != NULL)
|
|
{
|
|
ulmbcs_byte_t i;
|
|
ulmbcs_byte_t imax;
|
|
imax = sizeof(extraInfo->OptGrpConverter)/sizeof(extraInfo->OptGrpConverter[0]);
|
|
|
|
for (i=0; i < imax; i++)
|
|
{
|
|
extraInfo->OptGrpConverter[i] =
|
|
(OptGroupByteToCPName[i] != NULL) ?
|
|
ucnv_open(OptGroupByteToCPName[i], err) : NULL;
|
|
}
|
|
extraInfo->OptGroup = OptGroup;
|
|
extraInfo->localeConverterIndex = FindLMBCSLocale(locale);
|
|
}
|
|
else
|
|
{
|
|
*err = U_MEMORY_ALLOCATION_ERROR;
|
|
}
|
|
_this->extraInfo = extraInfo;
|
|
}
|
|
|
|
static void
|
|
_LMBCSClose(UConverter * _this)
|
|
{
|
|
if (_this->extraInfo != NULL && !_this->isExtraLocal)
|
|
{
|
|
ulmbcs_byte_t Ix;
|
|
UConverterDataLMBCS * extraInfo = (UConverterDataLMBCS *) _this->extraInfo;
|
|
|
|
for (Ix=0; Ix < ULMBCS_GRP_UNICODE; Ix++)
|
|
{
|
|
if (extraInfo->OptGrpConverter[Ix] != NULL)
|
|
ucnv_close (extraInfo->OptGrpConverter[Ix]);
|
|
}
|
|
uprv_free (_this->extraInfo);
|
|
}
|
|
}
|
|
|
|
/*
|
|
Here's an all-crash stop for debugging, since ICU does not have asserts.
|
|
Turn this on by defining LMBCS_DEBUG, or by changing it to
|
|
#if 1
|
|
*/
|
|
#if LMBCS_DEBUG
|
|
#define MyAssert(b) {if (!(b)) {*(char *)0 = 1;}}
|
|
#else
|
|
#define MyAssert(b)
|
|
#endif
|
|
|
|
/*
|
|
Here's the basic helper function that we use when converting from
|
|
Unicode to LMBCS, and we suspect that a Unicode character will fit into
|
|
one of the 12 groups. The return value is the number of bytes written
|
|
starting at pStartLMBCS (if any).
|
|
*/
|
|
|
|
static size_t
|
|
LMBCSConversionWorker (
|
|
UConverterDataLMBCS * extraInfo, /* subconverters, opt & locale groups */
|
|
ulmbcs_byte_t group, /* The group to try */
|
|
ulmbcs_byte_t * pStartLMBCS, /* where to put the results */
|
|
UChar * pUniChar, /* The input unicode character */
|
|
ulmbcs_byte_t * lastConverterIndex, /* output: track last successful group used */
|
|
UBool * groups_tried /* output: track any unsuccessful groups */
|
|
)
|
|
{
|
|
ulmbcs_byte_t * pLMBCS = pStartLMBCS;
|
|
UConverter * xcnv = extraInfo->OptGrpConverter[group];
|
|
|
|
int bytesConverted;
|
|
uint32_t value;
|
|
ulmbcs_byte_t firstByte;
|
|
|
|
MyAssert(xcnv);
|
|
MyAssert(group<ULMBCS_GRP_UNICODE);
|
|
|
|
bytesConverted = _MBCSFromUChar32(xcnv->sharedData, *pUniChar, &value, FALSE);
|
|
|
|
/* get the first result byte */
|
|
switch(bytesConverted)
|
|
{
|
|
case 4:
|
|
firstByte = (ulmbcs_byte_t)(value >> 24);
|
|
break;
|
|
case 3:
|
|
firstByte = (ulmbcs_byte_t)(value >> 16);
|
|
break;
|
|
case 2:
|
|
firstByte = (ulmbcs_byte_t)(value >> 8);
|
|
break;
|
|
case 1:
|
|
firstByte = (ulmbcs_byte_t)value;
|
|
break;
|
|
default:
|
|
/* most common failure mode is an unassigned character */
|
|
groups_tried[group] = TRUE;
|
|
return 0;
|
|
}
|
|
|
|
*lastConverterIndex = group;
|
|
|
|
/* All initial byte values in lower ascii range should have been caught by now,
|
|
except with the exception group.
|
|
*/
|
|
MyAssert((firstByte <= ULMBCS_C0END) || (firstByte >= ULMBCS_C1START) || (group == ULMBCS_GRP_EXCEPT));
|
|
|
|
/* use converted data: first write 0, 1 or two group bytes */
|
|
if (group != ULMBCS_GRP_EXCEPT && extraInfo->OptGroup != group)
|
|
{
|
|
*pLMBCS++ = group;
|
|
if (bytesConverted == 1 && group >= ULMBCS_DOUBLEOPTGROUP_START)
|
|
{
|
|
*pLMBCS++ = group;
|
|
}
|
|
}
|
|
|
|
/* don't emit control chars */
|
|
if ( bytesConverted == 1 && firstByte < 0x20 )
|
|
return 0;
|
|
|
|
|
|
/* then move over the converted data */
|
|
switch(bytesConverted)
|
|
{
|
|
case 4:
|
|
*pLMBCS++ = (ulmbcs_byte_t)(value >> 24);
|
|
case 3:
|
|
*pLMBCS++ = (ulmbcs_byte_t)(value >> 16);
|
|
case 2:
|
|
*pLMBCS++ = (ulmbcs_byte_t)(value >> 8);
|
|
case 1:
|
|
*pLMBCS++ = (ulmbcs_byte_t)value;
|
|
default:
|
|
/* will never occur */
|
|
break;
|
|
}
|
|
|
|
return (pLMBCS - pStartLMBCS);
|
|
}
|
|
|
|
|
|
/* This is a much simpler version of above, when we
|
|
know we are writing LMBCS using the Unicode group
|
|
*/
|
|
static size_t
|
|
LMBCSConvertUni(ulmbcs_byte_t * pLMBCS, UChar uniChar)
|
|
{
|
|
/* encode into LMBCS Unicode range */
|
|
uint8_t LowCh = (uint8_t)(uniChar & 0x00FF);
|
|
uint8_t HighCh = (uint8_t)(uniChar >> 8);
|
|
|
|
*pLMBCS++ = ULMBCS_GRP_UNICODE;
|
|
|
|
if (LowCh == 0)
|
|
{
|
|
*pLMBCS++ = ULMBCS_UNICOMPATZERO;
|
|
*pLMBCS++ = HighCh;
|
|
}
|
|
else
|
|
{
|
|
*pLMBCS++ = HighCh;
|
|
*pLMBCS++ = LowCh;
|
|
}
|
|
return ULMBCS_UNICODE_SIZE;
|
|
}
|
|
|
|
|
|
|
|
/* The main Unicode to LMBCS conversion function */
|
|
static void
|
|
_LMBCSFromUnicode(UConverterFromUnicodeArgs* args,
|
|
UErrorCode* err)
|
|
{
|
|
ulmbcs_byte_t lastConverterIndex = 0;
|
|
UChar uniChar;
|
|
ulmbcs_byte_t LMBCS[ULMBCS_CHARSIZE_MAX];
|
|
ulmbcs_byte_t * pLMBCS;
|
|
int bytes_written;
|
|
UBool groups_tried[ULMBCS_GRP_LAST+1];
|
|
UConverterDataLMBCS * extraInfo = (UConverterDataLMBCS *) args->converter->extraInfo;
|
|
int sourceIndex = 0;
|
|
|
|
|
|
/* Basic strategy: attempt to fill in local LMBCS 1-char buffer.(LMBCS)
|
|
If that succeeds, see if it will all fit into the target & copy it over
|
|
if it does.
|
|
|
|
We try conversions in the following order:
|
|
|
|
1. Single-byte ascii & special fixed control chars (&null)
|
|
2. Look up group in table & try that (could be
|
|
A) Unicode group
|
|
B) control group,
|
|
C) national encoding,
|
|
or ambiguous SBCS or MBCS group (on to step 4...)
|
|
|
|
3. If its ambiguous, try this order:
|
|
A) The optimization group
|
|
B) The locale group
|
|
C) The last group that succeeded with this string.
|
|
D) every other group that's relevent (single or double)
|
|
E) If its single-byte ambiguous, try the exceptions group
|
|
|
|
4. And as a grand fallback: Unicode
|
|
*/
|
|
|
|
while (args->source < args->sourceLimit && !U_FAILURE(*err))
|
|
{
|
|
if (args->target >= args->targetLimit)
|
|
{
|
|
*err = U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
uniChar = *(args->source);
|
|
bytes_written = 0;
|
|
pLMBCS = LMBCS;
|
|
|
|
/* check cases in rough order of how common they are, for speed */
|
|
|
|
/* single byte matches: strategy 1 */
|
|
|
|
if (((uniChar > ULMBCS_C0END) && (uniChar < ULMBCS_C1START)) ||
|
|
uniChar == 0 || uniChar == ULMBCS_HT || uniChar == ULMBCS_CR ||
|
|
uniChar == ULMBCS_LF || uniChar == ULMBCS_123SYSTEMRANGE
|
|
)
|
|
{
|
|
*pLMBCS++ = (ulmbcs_byte_t ) uniChar;
|
|
bytes_written = 1;
|
|
}
|
|
|
|
|
|
if (!bytes_written)
|
|
{
|
|
/* Check by UNICODE range (Strategy 2) */
|
|
ulmbcs_byte_t group = FindLMBCSUniRange(uniChar);
|
|
|
|
if (group == ULMBCS_GRP_UNICODE) /* (Strategy 2A) */
|
|
{
|
|
pLMBCS += LMBCSConvertUni(pLMBCS,uniChar);
|
|
|
|
bytes_written = pLMBCS - LMBCS;
|
|
}
|
|
else if (group == ULMBCS_GRP_CTRL) /* (Strategy 2B) */
|
|
{
|
|
/* Handle control characters here */
|
|
if (uniChar <= ULMBCS_C0END)
|
|
{
|
|
*pLMBCS++ = ULMBCS_GRP_CTRL;
|
|
*pLMBCS++ = (ulmbcs_byte_t)(ULMBCS_CTRLOFFSET + uniChar);
|
|
}
|
|
else if (uniChar >= ULMBCS_C1START && uniChar <= ULMBCS_C1START + ULMBCS_CTRLOFFSET)
|
|
{
|
|
*pLMBCS++ = ULMBCS_GRP_CTRL;
|
|
*pLMBCS++ = (ulmbcs_byte_t ) (uniChar & 0x00FF);
|
|
}
|
|
bytes_written = pLMBCS - LMBCS;
|
|
}
|
|
else if (group < ULMBCS_GRP_UNICODE) /* (Strategy 2C) */
|
|
{
|
|
/* a specific converter has been identified - use it */
|
|
bytes_written = LMBCSConversionWorker (
|
|
extraInfo, group, pLMBCS, &uniChar,
|
|
&lastConverterIndex, groups_tried);
|
|
}
|
|
if (!bytes_written) /* the ambiguous group cases (Strategy 3) */
|
|
{
|
|
memset(groups_tried, 0, sizeof(groups_tried));
|
|
|
|
/* check for non-default optimization group (Strategy 3A )*/
|
|
if (extraInfo->OptGroup != 1
|
|
&& ULMBCS_AMBIGUOUS_MATCH(group, extraInfo->OptGroup))
|
|
{
|
|
bytes_written = LMBCSConversionWorker (extraInfo,
|
|
extraInfo->OptGroup, pLMBCS, &uniChar,
|
|
&lastConverterIndex, groups_tried);
|
|
}
|
|
/* check for locale optimization group (Strategy 3B) */
|
|
if (!bytes_written
|
|
&& (extraInfo->localeConverterIndex)
|
|
&& (ULMBCS_AMBIGUOUS_MATCH(group, extraInfo->localeConverterIndex)))
|
|
{
|
|
bytes_written = LMBCSConversionWorker (extraInfo,
|
|
extraInfo->localeConverterIndex, pLMBCS, &uniChar,
|
|
&lastConverterIndex, groups_tried);
|
|
}
|
|
/* check for last optimization group used for this string (Strategy 3C) */
|
|
if (!bytes_written
|
|
&& (lastConverterIndex)
|
|
&& (ULMBCS_AMBIGUOUS_MATCH(group, lastConverterIndex)))
|
|
{
|
|
bytes_written = LMBCSConversionWorker (extraInfo,
|
|
lastConverterIndex, pLMBCS, &uniChar,
|
|
&lastConverterIndex, groups_tried);
|
|
|
|
}
|
|
if (!bytes_written)
|
|
{
|
|
/* just check every possible matching converter (Strategy 3D) */
|
|
ulmbcs_byte_t grp_start;
|
|
ulmbcs_byte_t grp_end;
|
|
ulmbcs_byte_t grp_ix;
|
|
grp_start = (ulmbcs_byte_t)((group == ULMBCS_AMBIGUOUS_MBCS)
|
|
? ULMBCS_DOUBLEOPTGROUP_START
|
|
: ULMBCS_GRP_L1);
|
|
grp_end = (ulmbcs_byte_t)((group == ULMBCS_AMBIGUOUS_MBCS)
|
|
? ULMBCS_GRP_LAST
|
|
: ULMBCS_GRP_TH);
|
|
for (grp_ix = grp_start;
|
|
grp_ix <= grp_end && !bytes_written;
|
|
grp_ix++)
|
|
{
|
|
if (extraInfo->OptGrpConverter [grp_ix] && !groups_tried [grp_ix])
|
|
{
|
|
bytes_written = LMBCSConversionWorker (extraInfo,
|
|
grp_ix, pLMBCS, &uniChar,
|
|
&lastConverterIndex, groups_tried);
|
|
}
|
|
}
|
|
/* a final conversion fallback to the exceptions group if its likely
|
|
to be single byte (Strategy 3E) */
|
|
if (!bytes_written && grp_start == ULMBCS_GRP_L1)
|
|
{
|
|
bytes_written = LMBCSConversionWorker (extraInfo,
|
|
ULMBCS_GRP_EXCEPT, pLMBCS, &uniChar,
|
|
&lastConverterIndex, groups_tried);
|
|
}
|
|
}
|
|
/* all of our other strategies failed. Fallback to Unicode. (Strategy 4)*/
|
|
if (!bytes_written)
|
|
{
|
|
|
|
pLMBCS += LMBCSConvertUni(pLMBCS, uniChar);
|
|
bytes_written = pLMBCS - LMBCS;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* we have a translation. increment source and write as much as posible to target */
|
|
args->source++;
|
|
pLMBCS = LMBCS;
|
|
while (args->target < args->targetLimit && bytes_written--)
|
|
{
|
|
*(args->target)++ = *pLMBCS++;
|
|
if (args->offsets)
|
|
{
|
|
*(args->offsets)++ = sourceIndex;
|
|
}
|
|
}
|
|
sourceIndex++;
|
|
if (bytes_written > 0)
|
|
{
|
|
/* write any bytes that didn't fit in target to the error buffer,
|
|
common code will move this to target if we get called back with
|
|
enough target room
|
|
*/
|
|
uint8_t * pErrorBuffer = args->converter->charErrorBuffer;
|
|
*err = U_BUFFER_OVERFLOW_ERROR;
|
|
args->converter->charErrorBufferLength = (int8_t)bytes_written;
|
|
while (bytes_written--)
|
|
{
|
|
*pErrorBuffer++ = *pLMBCS++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* Now, the Unicode from LMBCS section */
|
|
|
|
|
|
/* A function to call when we are looking at the Unicode group byte in LMBCS */
|
|
static UChar
|
|
GetUniFromLMBCSUni(char const ** ppLMBCSin) /* Called with LMBCS-style Unicode byte stream */
|
|
{
|
|
uint8_t HighCh = *(*ppLMBCSin)++; /* Big-endian Unicode in LMBCS compatibility group*/
|
|
uint8_t LowCh = *(*ppLMBCSin)++;
|
|
|
|
if (HighCh == ULMBCS_UNICOMPATZERO )
|
|
{
|
|
HighCh = LowCh;
|
|
LowCh = 0; /* zero-byte in LSB special character */
|
|
}
|
|
return (UChar)((HighCh << 8) | LowCh);
|
|
}
|
|
|
|
|
|
|
|
/* CHECK_SOURCE_LIMIT: Helper macro to verify that there are at least'index'
|
|
bytes left in source up to sourceLimit.Errors appropriately if not.
|
|
If we reach the limit, then update the source pointer to there to consume
|
|
all input as required by ICU converter semantics.
|
|
*/
|
|
|
|
#define CHECK_SOURCE_LIMIT(index) \
|
|
if (args->source+index > args->sourceLimit){\
|
|
*err = U_TRUNCATED_CHAR_FOUND;\
|
|
args->source = args->sourceLimit;\
|
|
return 0xffff;}
|
|
|
|
/* Return the Unicode representation for the current LMBCS character */
|
|
|
|
static UChar32
|
|
_LMBCSGetNextUCharWorker(UConverterToUnicodeArgs* args,
|
|
UErrorCode* err)
|
|
{
|
|
UChar32 uniChar = 0; /* an output UNICODE char */
|
|
ulmbcs_byte_t CurByte; /* A byte from the input stream */
|
|
const char * saveSource;
|
|
|
|
/* error check */
|
|
if (args->source >= args->sourceLimit)
|
|
{
|
|
*err = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return 0xffff;
|
|
}
|
|
/* Grab first byte & save address for error recovery */
|
|
CurByte = *((ulmbcs_byte_t *) (saveSource = args->source++));
|
|
|
|
/*
|
|
* at entry of each if clause:
|
|
* 1. 'CurByte' points at the first byte of a LMBCS character
|
|
* 2. '*source'points to the next byte of the source stream after 'CurByte'
|
|
*
|
|
* the job of each if clause is:
|
|
* 1. set '*source' to point at the beginning of next char (nop if LMBCS char is only 1 byte)
|
|
* 2. set 'uniChar' up with the right Unicode value, or set 'err' appropriately
|
|
*/
|
|
|
|
/* First lets check the simple fixed values. */
|
|
|
|
if(((CurByte > ULMBCS_C0END) && (CurByte < ULMBCS_C1START)) /* ascii range */
|
|
|| (CurByte == 0)
|
|
|| CurByte == ULMBCS_HT || CurByte == ULMBCS_CR
|
|
|| CurByte == ULMBCS_LF || CurByte == ULMBCS_123SYSTEMRANGE)
|
|
{
|
|
uniChar = CurByte;
|
|
}
|
|
else
|
|
{
|
|
UConverterDataLMBCS * extraInfo;
|
|
ulmbcs_byte_t group;
|
|
UConverter* cnv;
|
|
|
|
if (CurByte == ULMBCS_GRP_CTRL) /* Control character group - no opt group update */
|
|
{
|
|
ulmbcs_byte_t C0C1byte;
|
|
CHECK_SOURCE_LIMIT(1);
|
|
C0C1byte = *(args->source)++;
|
|
uniChar = (C0C1byte < ULMBCS_C1START) ? C0C1byte - ULMBCS_CTRLOFFSET : C0C1byte;
|
|
}
|
|
else
|
|
if (CurByte == ULMBCS_GRP_UNICODE) /* Unicode compatibility group: BigEndian UTF16 */
|
|
{
|
|
CHECK_SOURCE_LIMIT(2);
|
|
|
|
/* don't check for error indicators fffe/ffff below */
|
|
return GetUniFromLMBCSUni(&(args->source));
|
|
}
|
|
else if (CurByte <= ULMBCS_CTRLOFFSET)
|
|
{
|
|
group = CurByte; /* group byte is in the source */
|
|
extraInfo = (UConverterDataLMBCS *) args->converter->extraInfo;
|
|
cnv = extraInfo->OptGrpConverter[group];
|
|
if (!cnv)
|
|
{
|
|
/* this is not a valid group byte - no converter*/
|
|
*err = U_INVALID_CHAR_FOUND;
|
|
}
|
|
else if (group >= ULMBCS_DOUBLEOPTGROUP_START) /* double byte conversion */
|
|
{
|
|
|
|
CHECK_SOURCE_LIMIT(2);
|
|
|
|
/* check for LMBCS doubled-group-byte case */
|
|
if (*args->source == group) {
|
|
/* single byte */
|
|
++args->source;
|
|
uniChar = _MBCSSimpleGetNextUChar(cnv->sharedData, &args->source, args->source + 1, FALSE);
|
|
} else {
|
|
/* double byte */
|
|
const char *newLimit = args->source + 2;
|
|
uniChar = _MBCSSimpleGetNextUChar(cnv->sharedData, &args->source, newLimit, FALSE);
|
|
args->source = newLimit; /* set the correct limit even in case of an error */
|
|
}
|
|
}
|
|
else { /* single byte conversion */
|
|
CHECK_SOURCE_LIMIT(1);
|
|
CurByte = *(args->source)++;
|
|
|
|
if (CurByte >= ULMBCS_C1START)
|
|
{
|
|
uniChar = _MBCS_SINGLE_SIMPLE_GET_NEXT_BMP(cnv->sharedData, CurByte);
|
|
}
|
|
else
|
|
{
|
|
/* The non-optimizable oddballs where there is an explicit byte
|
|
* AND the second byte is not in the upper ascii range
|
|
*/
|
|
const char *s;
|
|
char bytes[2];
|
|
|
|
extraInfo = (UConverterDataLMBCS *) args->converter->extraInfo;
|
|
cnv = extraInfo->OptGrpConverter [ULMBCS_GRP_EXCEPT];
|
|
|
|
/* Lookup value must include opt group */
|
|
bytes[0] = group;
|
|
bytes[1] = CurByte;
|
|
s = bytes;
|
|
uniChar = _MBCSSimpleGetNextUChar(cnv->sharedData, &s, bytes + 2, FALSE);
|
|
}
|
|
}
|
|
}
|
|
else if (CurByte >= ULMBCS_C1START) /* group byte is implicit */
|
|
{
|
|
extraInfo = (UConverterDataLMBCS *) args->converter->extraInfo;
|
|
group = extraInfo->OptGroup;
|
|
cnv = extraInfo->OptGrpConverter[group];
|
|
if (group >= ULMBCS_DOUBLEOPTGROUP_START) /* double byte conversion */
|
|
{
|
|
if (!_MBCSIsLeadByte(cnv->sharedData, CurByte))
|
|
{
|
|
CHECK_SOURCE_LIMIT(0);
|
|
|
|
/* let the MBCS conversion consume CurByte again */
|
|
--args->source;
|
|
uniChar = _MBCSSimpleGetNextUChar(cnv->sharedData, &args->source, args->source + 1, FALSE);
|
|
}
|
|
else
|
|
{
|
|
CHECK_SOURCE_LIMIT(1);
|
|
/* let the MBCS conversion consume CurByte again */
|
|
--args->source;
|
|
/* since we know that we start at a lead byte, args->source _will_ be incremented by 2 */
|
|
uniChar = _MBCSSimpleGetNextUChar(cnv->sharedData, &args->source, args->source + 2, FALSE);
|
|
}
|
|
}
|
|
else /* single byte conversion */
|
|
{
|
|
uniChar = _MBCS_SINGLE_SIMPLE_GET_NEXT_BMP(cnv->sharedData, CurByte);
|
|
}
|
|
}
|
|
}
|
|
return uniChar;
|
|
}
|
|
|
|
|
|
/* The exported function that converts lmbcs to one or more
|
|
UChars - currently UTF-16
|
|
*/
|
|
static void
|
|
_LMBCSToUnicodeWithOffsets(UConverterToUnicodeArgs* args,
|
|
UErrorCode* err)
|
|
{
|
|
char LMBCS [ULMBCS_CHARSIZE_MAX];
|
|
UChar uniChar; /* one output UNICODE char */
|
|
const char * saveSource; /* beginning of current code point */
|
|
const char * pStartLMBCS = args->source; /* beginning of whole string */
|
|
const char * errSource = NULL; /* pointer to actual input in case an error occurs */
|
|
int8_t savebytes = 0;
|
|
|
|
/* Process from source to limit, or until error */
|
|
while (U_SUCCESS(*err) && args->sourceLimit > args->source && args->targetLimit > args->target)
|
|
{
|
|
saveSource = args->source; /* beginning of current code point */
|
|
|
|
if (args->converter->toULength) /* reassemble char from previous call */
|
|
{
|
|
const char *saveSourceLimit;
|
|
size_t size_old = args->converter->toULength;
|
|
|
|
/* limit from source is either remainder of temp buffer, or user limit on source */
|
|
size_t size_new_maybe_1 = sizeof(LMBCS) - size_old;
|
|
size_t size_new_maybe_2 = args->sourceLimit - args->source;
|
|
size_t size_new = (size_new_maybe_1 < size_new_maybe_2) ? size_new_maybe_1 : size_new_maybe_2;
|
|
|
|
|
|
uprv_memcpy(LMBCS, args->converter->toUBytes, size_old);
|
|
uprv_memcpy(LMBCS + size_old, args->source, size_new);
|
|
saveSourceLimit = args->sourceLimit;
|
|
args->source = errSource = LMBCS;
|
|
args->sourceLimit = LMBCS+size_old+size_new;
|
|
savebytes = (int8_t)(size_old+size_new);
|
|
uniChar = (UChar) _LMBCSGetNextUCharWorker(args, err);
|
|
args->source = saveSource + ((args->source - LMBCS) - size_old);
|
|
args->sourceLimit = saveSourceLimit;
|
|
|
|
if (*err == U_TRUNCATED_CHAR_FOUND)
|
|
{
|
|
/* evil special case: source buffers so small a char spans more than 2 buffers */
|
|
args->converter->toULength = savebytes;
|
|
uprv_memcpy(args->converter->toUBytes, LMBCS, savebytes);
|
|
args->source = args->sourceLimit;
|
|
*err = U_ZERO_ERROR;
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
/* clear the partial-char marker */
|
|
args->converter->toULength = 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
errSource = saveSource;
|
|
uniChar = (UChar) _LMBCSGetNextUCharWorker(args, err);
|
|
savebytes = (int8_t)(args->source - saveSource);
|
|
}
|
|
if (U_SUCCESS(*err))
|
|
{
|
|
if (uniChar < 0xfffe)
|
|
{
|
|
*(args->target)++ = uniChar;
|
|
if(args->offsets)
|
|
{
|
|
*(args->offsets)++ = saveSource - pStartLMBCS;
|
|
}
|
|
}
|
|
else if (uniChar == 0xfffe)
|
|
{
|
|
*err = U_INVALID_CHAR_FOUND;
|
|
}
|
|
else /* if (uniChar == 0xffff) */
|
|
{
|
|
*err = U_ILLEGAL_CHAR_FOUND;
|
|
}
|
|
}
|
|
}
|
|
/* if target ran out before source, return U_BUFFER_OVERFLOW_ERROR */
|
|
if (U_SUCCESS(*err) && args->sourceLimit > args->source && args->targetLimit <= args->target)
|
|
{
|
|
*err = U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
else if (U_FAILURE(*err))
|
|
{
|
|
/* If character incomplete or unmappable/illegal, store it in toUBytes[] */
|
|
args->converter->toULength = savebytes;
|
|
if (savebytes > 0) {
|
|
uprv_memcpy(args->converter->toUBytes, errSource, savebytes);
|
|
}
|
|
if (*err == U_TRUNCATED_CHAR_FOUND) {
|
|
*err = U_ZERO_ERROR;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* And now, the macroized declarations of data & functions: */
|
|
DEFINE_LMBCS_OPEN(1)
|
|
DEFINE_LMBCS_OPEN(2)
|
|
DEFINE_LMBCS_OPEN(3)
|
|
DEFINE_LMBCS_OPEN(4)
|
|
DEFINE_LMBCS_OPEN(5)
|
|
DEFINE_LMBCS_OPEN(6)
|
|
DEFINE_LMBCS_OPEN(8)
|
|
DEFINE_LMBCS_OPEN(11)
|
|
DEFINE_LMBCS_OPEN(16)
|
|
DEFINE_LMBCS_OPEN(17)
|
|
DEFINE_LMBCS_OPEN(18)
|
|
DEFINE_LMBCS_OPEN(19)
|
|
|
|
|
|
DECLARE_LMBCS_DATA(1)
|
|
DECLARE_LMBCS_DATA(2)
|
|
DECLARE_LMBCS_DATA(3)
|
|
DECLARE_LMBCS_DATA(4)
|
|
DECLARE_LMBCS_DATA(5)
|
|
DECLARE_LMBCS_DATA(6)
|
|
DECLARE_LMBCS_DATA(8)
|
|
DECLARE_LMBCS_DATA(11)
|
|
DECLARE_LMBCS_DATA(16)
|
|
DECLARE_LMBCS_DATA(17)
|
|
DECLARE_LMBCS_DATA(18)
|
|
DECLARE_LMBCS_DATA(19)
|
|
|
|
#endif /* #if !UCONFIG_NO_LEGACY_CONVERSION */
|