1083 lines
40 KiB
C
1083 lines
40 KiB
C
/*
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**********************************************************************
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* Copyright (C) 1999, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* ucnv.h:
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* External APIs for the ICU's codeset conversion library
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* Bertrand A. Damiba
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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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* 04/04/99 helena Fixed internal header inclusion.
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* 05/11/00 helena Added setFallback and usesFallback APIs.
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* 06/29/2000 helena Major rewrite of the callback APIs.
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* 12/07/2000 srl Update of documentation
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*/
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/**
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* \file
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* \brief C API: Character conversion
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*
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* <h2>Character Conversion C API </h2>
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*
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*/
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#ifndef UCNV_H
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#define UCNV_H
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/* Forward declaring the UConverter structure */
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struct UConverter;
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typedef struct UConverter UConverter;
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#include "unicode/utypes.h"
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#include "unicode/ucnv_err.h"
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U_CDECL_BEGIN
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/* maximum length of the converter names */
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#define UCNV_MAX_CONVERTER_NAME_LENGTH 60
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#define UCNV_MAX_FULL_FILE_NAME_LENGTH (600+UCNV_MAX_CONVERTER_NAME_LENGTH)
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#define UCNV_SI 0x0F /*Shift in for EBDCDIC_STATEFUL and iso2022 states */
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#define UCNV_SO 0x0E /*Shift out for EBDCDIC_STATEFUL and iso2022 states */
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/**
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* Enum for specifying basic types of converters
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* @see ucnv_getType
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*/
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typedef enum {
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UCNV_UNSUPPORTED_CONVERTER = -1,
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UCNV_SBCS = 0,
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UCNV_DBCS = 1,
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UCNV_MBCS = 2,
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UCNV_LATIN_1 = 3,
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UCNV_UTF8 = 4,
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UCNV_UTF16_BigEndian = 5,
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UCNV_UTF16_LittleEndian = 6,
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UCNV_UTF32_BigEndian = 7,
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UCNV_UTF32_LittleEndian = 8,
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UCNV_EBCDIC_STATEFUL = 9,
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UCNV_ISO_2022 = 10,
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UCNV_LMBCS_1 = 11,
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UCNV_LMBCS_2,
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UCNV_LMBCS_3,
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UCNV_LMBCS_4,
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UCNV_LMBCS_5,
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UCNV_LMBCS_6,
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UCNV_LMBCS_8,
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UCNV_LMBCS_11,
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UCNV_LMBCS_16,
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UCNV_LMBCS_17,
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UCNV_LMBCS_18,
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UCNV_LMBCS_19,
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UCNV_LMBCS_LAST = UCNV_LMBCS_19,
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UCNV_HZ,
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UCNV_SCSU,
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UCNV_US_ASCII,
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UCNV_UTF7,
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/* Number of converter types for which we have conversion routines. */
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UCNV_NUMBER_OF_SUPPORTED_CONVERTER_TYPES
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} UConverterType;
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/**
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* Enum for specifying which platform a converter ID refers to
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* @see ucnv_getPlatform
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* @see ucnv_openCCSID
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*/
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typedef enum {
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UCNV_UNKNOWN = -1,
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UCNV_IBM = 0
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} UConverterPlatform;
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/**
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* Function pointer for error callback in the codepage to unicode direction.
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* Called when an error has occured in conversion to unicode, or on open/close of the callback (see reason).
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* @param context Pointer to the callback's private data
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* @param args Information about the conversion in progress
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* @param codePoints Points to 'length' bytes of the concerned codepage sequence
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* @param length Size (in bytes) of the concerned codepage sequence
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* @param reason Defines the reason the callback was invoked
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* @see ucnv_setToUCallBack
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* @see UConverterToUnicodeArgs
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*/
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typedef void (*UConverterToUCallback) (
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void* context,
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UConverterToUnicodeArgs *args,
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const char *codePoints,
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int32_t length,
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UConverterCallbackReason reason,
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UErrorCode *);
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/**
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* Function pointer for error callback in the unicode to codepage direction.
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* Called when an error has occured in conversion from unicode, or on open/close of the callback (see reason).
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* @param context Pointer to the callback's private data
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* @param args Information about the conversion in progress
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* @param codeUnits Points to 'length' UChars of the concerned Unicode sequence
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* @param length Size (in bytes) of the concerned codepage sequence
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* @param codePoint Single UChar32 (UTF-32) containing the concerend Unicode codepoint.
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* @param reason Defines the reason the callback was invoked
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* @see ucnv_setFromUCallBack
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*/
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typedef void (*UConverterFromUCallback) (
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void* context,
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UConverterFromUnicodeArgs *args,
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const UChar* codeUnits,
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int32_t length,
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UChar32 codePoint,
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UConverterCallbackReason reason,
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UErrorCode *);
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U_CDECL_END
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/**
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* Character that separates converter names from options and options from each other.
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* @see ucnv_open
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*/
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#define UCNV_OPTION_SEP_CHAR ','
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/**
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* String version of UCNV_OPTION_SEP_CHAR.
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* @see ucnv_open
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*/
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#define UCNV_OPTION_SEP_STRING ","
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/**
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* Character that separates a converter option from its value.
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* @see ucnv_open
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*/
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#define UCNV_VALUE_SEP_CHAR '='
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/**
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* String version of UCNV_VALUE_SEP_CHAR.
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* @see ucnv_open
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*/
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#define UCNV_VALUE_SEP_STRING "="
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/**
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* Converter option for specifying a locale.
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* @see ucnv_open
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*/
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#define UCNV_LOCALE_OPTION_STRING ",locale="
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/**
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* Do a fuzzy compare of a two converter/alias names. The comparison
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* is case-insensitive. It also ignores the characters '-', '_', and
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* ' ' (dash, underscore, and space). Thus the strings "UTF-8",
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* "utf_8", and "Utf 8" are exactly equivalent.
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*
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* @param name1 a converter name or alias, zero-terminated
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* @param name2 a converter name or alias, zero-terminated
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* @return 0 if the names match, or a negative value if the name1
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* lexically precedes name2, or a positive value if the name1
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* lexically follows name2.
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* @draft
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*/
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U_CAPI int U_EXPORT2
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ucnv_compareNames(const char *name1, const char *name2);
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/**
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* Creates a UConverter object with the names specified as a C string.
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* The actual name will be resolved with the alias file
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* using a case-insensitive string comparison that ignores
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* the delimiters '-', '_', and ' ' (dash, underscore, and space).
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* E.g., the names "UTF8", "utf-8", and "Utf 8" are all equivalent.
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* If <code>NULL</code> is passed for the converter name, it will create one with the
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* getDefaultName return value.
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*
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* <p>A converter name for ICU 1.5 and above may contain options
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* like a locale specification to control the specific behavior of
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* the newly instantiated converter.
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* The meaning of the options depends on the particular converter.
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* If an option is not defined for or recognized by a given converter, then it is ignored.</p>
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*
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* <p>Options are appended to the converter name string, with a
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* <code>UCNV_OPTION_SEP_CHAR</code> between the name and the first option and
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* also between adjacent options.</p>
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*
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* @param converterName : name of the uconv table, may have options appended
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* @param err outgoing error status <TT>U_MEMORY_ALLOCATION_ERROR, TABLE_NOT_FOUND</TT>
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* @return the created Unicode converter object, or <TT>NULL</TT> if an error occured
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* @see ucnv_openU
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* @see ucnv_openCCSID
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* @see ucnv_close
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* @stable
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*/
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U_CAPI UConverter* U_EXPORT2
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ucnv_open (const char *converterName, UErrorCode * err);
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/**
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* Creates a Unicode converter with the names specified as unicode string.
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* The name should be limited to the ASCII-7 alphanumerics range.
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* The actual name will be resolved with the alias file
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* using a case-insensitive string comparison that ignores
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* the delimiters '-', '_', and ' ' (dash, underscore, and space).
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* E.g., the names "UTF8", "utf-8", and "Utf 8" are all equivalent.
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* If <TT>NULL</TT> is passed for the converter name, it will create
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* one with the ucnv_getDefaultName() return value.
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* @param converterName : name of the uconv table in a zero terminated
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* Unicode string
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* @param err outgoing error status <TT>U_MEMORY_ALLOCATION_ERROR,
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* TABLE_NOT_FOUND</TT>
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* @return the created Unicode converter object, or <TT>NULL</TT> if an
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* error occured
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* @see ucnv_open
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* @see ucnv_openCCSID
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* @see ucnv_close
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* @see ucnv_getDefaultName
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* @stable
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*/
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U_CAPI UConverter* U_EXPORT2
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ucnv_openU (const UChar * name,
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UErrorCode * err);
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/**
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* Creates a UConverter object from a CCSID number and platform pair
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*
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* @param codepage codepage number to create
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* @param platform the platform in which the codepage number exists
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* @param err error status <TT>U_MEMORY_ALLOCATION_ERROR, TABLE_NOT_FOUND</TT>
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* @return the created Unicode converter object, or <TT>NULL</TT> if an error
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* occured.
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* @see ucnv_open
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* @see ucnv_openU
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* @see ucnv_close
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* @see UConverterPlatform
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* @stable
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*/
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U_CAPI UConverter* U_EXPORT2
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ucnv_openCCSID (int32_t codepage,
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UConverterPlatform platform,
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UErrorCode * err);
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/**
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* Thread safe cloning operation
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* @param cnv converter to be cloned
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* @param stackBuffer user allocated space for the new clone. If NULL new memory will be allocated.
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If buffer is not large enough, new memory will be allocated.
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Clients can use the U_CNV_SAFECLONE_BUFFERSIZE. This will probably be enough to avoid memory allocations.
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* @param pBufferSize pointer to size of allocated space.
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If *pBufferSize == 0, a sufficient size for use in cloning will
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be returned ('pre-flighting')
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If *pBufferSize is not enough for a stack-based safe clone,
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new memory will be allocated.
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* @param status to indicate whether the operation went on smoothly or there were errors
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An informational status value, U_SAFECLONE_ALLOCATED_ERROR, is used if any allocations were necessary.
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* @return pointer to the new clone
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* @draft API 1.8 freeze
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*/
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U_CAPI UConverter *
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ucnv_safeClone(
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const UConverter *cnv,
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void *stackBuffer,
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int32_t *pBufferSize,
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UErrorCode *status);
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#define U_CNV_SAFECLONE_BUFFERSIZE 512
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/**
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* Deletes the unicode converter and releases resources associated
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* with just this instance.
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* Does not free up shared converter tables.
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*
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* @param converter the converter object to be deleted
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* @see ucnv_open
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* @see ucnv_openU
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* @see ucnv_openCCSID
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* @stable
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*/
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U_CAPI void U_EXPORT2
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ucnv_close (UConverter * converter);
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/**
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* Fills in the output parameter, subChars, with the substitution characters
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* as multiple bytes.
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*
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* @param converter the Unicode converter
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* @param subChars the subsitution characters
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* @param len on input the capacity of subChars, on output the number
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* of bytes copied to it
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* @param err the outgoing error status code.
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* If the substitution character array is too small, an
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* <TT>U_INDEX_OUTOFBOUNDS_ERROR</TT> will be returned.
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* @see ucnv_setSubstChars
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* @stable
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*/
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U_CAPI void U_EXPORT2
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ucnv_getSubstChars (const UConverter * converter,
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char *subChars,
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int8_t * len,
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UErrorCode * err);
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/**
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* Sets the substitution chars when converting from unicode to a codepage. The
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* substitution is specified as a string of 1-4 bytes, and may contain
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* <TT>NULL</TT> byte.
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* @param converter the Unicode converter
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* @param subChars the substitution character byte sequence we want set
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* @param len the number of bytes in subChars
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* @param err the error status code. <TT>U_INDEX_OUTOFBOUNDS_ERROR </TT> if
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* len is bigger than the maximum number of bytes allowed in subchars
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* @see ucnv_getSubstChars
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* @stable
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*/
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U_CAPI void U_EXPORT2
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ucnv_setSubstChars (UConverter * converter,
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const char *subChars,
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int8_t len,
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UErrorCode * err);
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/**
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* Fills in the output parameter, errBytes, with the error characters from the
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* last failing conversion.
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*
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* @param converter the Unicode converter
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* @param errBytes the codepage bytes which were in error
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* @param len on input the capacity of errBytes, on output the number of
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* bytes which were copied to it
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* @param err the error status code.
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* If the substitution character array is too small, an
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* <TT>U_INDEX_OUTOFBOUNDS_ERROR</TT> will be returned.
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* @stable
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*/
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U_CAPI void U_EXPORT2
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ucnv_getInvalidChars (const UConverter * converter,
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char *errBytes,
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int8_t * len,
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UErrorCode * err);
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/**
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* Fills in the output parameter, errChars, with the error characters from the
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* last failing conversion.
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*
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* @param converter the Unicode converter
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* @param errUChars the UChars which were in error
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* @param len on input the capacity of errUChars, on output the number of
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* UChars which were copied to it
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* @param err the error status code.
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* If the substitution character array is too small, an
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* <TT>U_INDEX_OUTOFBOUNDS_ERROR</TT> will be returned.
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* @stable
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*/
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U_CAPI void U_EXPORT2
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ucnv_getInvalidUChars (const UConverter * converter,
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UChar *errUChars,
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int8_t * len,
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UErrorCode * err);
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/**
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* Resets the state of a converter to the default state. This is used
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* in the case of an error, to restart a conversion from a known default state.
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* It will also empty the internal output buffers.
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* @param converter the Unicode converter
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* @stable
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*/
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U_CAPI void U_EXPORT2
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ucnv_reset (UConverter * converter);
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/**
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* Resets the to-Unicode part of a converter state to the default state.
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* This is used in the case of an error to restart a conversion to
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* Unicode to a known default state. It will also empty the internal
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* output buffers used for the conversion to Unicode codepoints.
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* @param converter the Unicode converter
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* @draft
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*/
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U_CAPI void
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ucnv_resetToUnicode(UConverter *converter);
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/**
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* Resets the from-Unicode part of a converter state to the default state.
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* This is used in the case of an error to restart a conversion from
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* Unicode to a known default state. It will also empty the internal output
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* buffers used for the conversion from Unicode codepoints.
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* @param converter the Unicode converter
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* @draft
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*/
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U_CAPI void
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ucnv_resetFromUnicode(UConverter *converter);
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/**
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* Returns the maximum length of bytes used by a character. This varies
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* between 1 and 4
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* @param converter the Unicode converter
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* @return the maximum number of bytes allowed by this particular converter
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* @see ucnv_getMinCharSize
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* @stable
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*/
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U_CAPI int8_t U_EXPORT2
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ucnv_getMaxCharSize (const UConverter * converter);
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/**
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* Returns the minimum byte length for characters in this codepage.
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* This is either 1 or 2 for all supported codepages.
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* @param converter the Unicode converter
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* @return the minimum number of bytes allowed by this particular converter
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* @see ucnv_getMaxCharSize
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* @stable
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*/
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U_CAPI int8_t U_EXPORT2
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ucnv_getMinCharSize (const UConverter * converter);
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/**
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* Returns the display name of the converter passed in based on the Locale
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* passed in. If the locale contains no display name, the internal ASCII
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* name will be filled in.
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*
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* @param converter the Unicode converter.
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* @param displayLocale is the specific Locale we want to localised for
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* @param displayName user provided buffer to be filled in
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* @param displayNameCapacty size of displayName Buffer
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* @param err error status code
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* @return displayNameLength number of UChar needed in displayName
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* @see ucnv_getName
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* @stable
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*/
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U_CAPI int32_t U_EXPORT2
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ucnv_getDisplayName (const UConverter * converter,
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const char *displayLocale,
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UChar * displayName,
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int32_t displayNameCapacity,
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UErrorCode * err);
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/**
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* Gets the internal, canonical name of the converter (zero-terminated).
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* The lifetime of the returned string will be that of the converter
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* passed to this function.
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* @param converter the Unicode converter
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* @param err UErrorCode status
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* @return the internal name of the converter
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* @see ucnv_getDisplayName
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* @stable
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*/
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U_CAPI const char * U_EXPORT2
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ucnv_getName (const UConverter * converter, UErrorCode * err);
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/**
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* Gets a codepage number associated with the converter. This is not guaranteed
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* to be the one used to create the converter. Some converters do not represent
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* platform registered codepages and return zero for the codepage number.
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* The error code fill-in parameter indicates if the codepage number
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* is available.
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* Does not check if the converter is <TT>NULL</TT> or if converter's data
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* table is <TT>NULL</TT>.
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* @param converter the Unicode converter
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* @param err the error status code.
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* @return If any error occurrs, -1 will be returned otherwise, the codepage number
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* will be returned
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* @stable
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*/
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U_CAPI int32_t U_EXPORT2
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ucnv_getCCSID (const UConverter * converter,
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UErrorCode * err);
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/**
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* Gets a codepage platform associated with the converter. Currently,
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* only <TT>UCNV_IBM</TT> will be returned.
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* Does not test if the converter is <TT>NULL</TT> or if converter's data
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* table is <TT>NULL</TT>.
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* @param converter the Unicode converter
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* @param err the error status code.
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* @return The codepage platform
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* @stable
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*/
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U_CAPI UConverterPlatform U_EXPORT2
|
|
ucnv_getPlatform (const UConverter * converter,
|
|
UErrorCode * err);
|
|
|
|
/**
|
|
* Gets the type of the converter
|
|
* e.g. SBCS, MBCS, DBCS, UTF8, UTF16_BE, UTF16_LE, ISO_2022,
|
|
* EBCDIC_STATEFUL, LATIN_1
|
|
* @param converter a valid, opened converter
|
|
* @return the type of the converter
|
|
* @stable
|
|
*/
|
|
U_CAPI UConverterType U_EXPORT2
|
|
ucnv_getType (const UConverter * converter);
|
|
|
|
/**
|
|
* Gets the "starter" (lead) bytes for converters of type MBCS.
|
|
* Will fill in an <TT>U_ILLEGAL_ARGUMENT_ERROR</TT> if converter passed in
|
|
* is not MBCS. Fills in an array of type UBool, with the value of the byte
|
|
* as offset to the array. For example, if (starters[0x20] == TRUE) at return,
|
|
* it means that the byte 0x20 is a starter byte in this converter.
|
|
* Context pointers are always owned by the caller.
|
|
*
|
|
* @param converter a valid, opened converter of type MBCS
|
|
* @param starters an array of size 256 to be filled in
|
|
* @param err error status, <TT>U_ILLEGAL_ARGUMENT_ERROR</TT> if the
|
|
* converter is not a type which can return starters.
|
|
* @see ucnv_getType
|
|
* @stable
|
|
*/
|
|
U_CAPI void U_EXPORT2 ucnv_getStarters(const UConverter* converter,
|
|
UBool starters[256],
|
|
UErrorCode* err);
|
|
|
|
|
|
/**
|
|
* Gets the current calback function used by the converter when an illegal
|
|
* or invalid codepage sequence is found.
|
|
* Context pointers are always owned by the caller.
|
|
*
|
|
* @param converter the unicode converter
|
|
* @param action fillin: returns the callback function pointer
|
|
* @param context fillin: returns the callback's private void* context
|
|
* @see ucnv_setToUCallBack
|
|
* @stable
|
|
*/
|
|
U_CAPI void U_EXPORT2
|
|
ucnv_getToUCallBack (const UConverter * converter,
|
|
UConverterToUCallback *action,
|
|
void **context);
|
|
|
|
/**
|
|
* Gets the current callback function used by the converter when illegal
|
|
* or invalid Unicode sequence is found.
|
|
* Context pointers are always owned by the caller.
|
|
*
|
|
* @param converter the unicode converter
|
|
* @param action fillin: returns the callback function pointer
|
|
* @param context fillin: returns the callback's private void* context
|
|
* @see ucnv_setFromUCallBack
|
|
* @stable
|
|
*/
|
|
U_CAPI void U_EXPORT2
|
|
ucnv_getFromUCallBack (const UConverter * converter,
|
|
UConverterFromUCallback *action,
|
|
void **context);
|
|
|
|
/**
|
|
* Changes the callback function used by the converter when
|
|
* an illegal or invalid sequence is found.
|
|
* Context pointers are always owned by the caller.
|
|
*
|
|
* @param converter the unicode converter
|
|
* @param newAction the new callback function
|
|
* @param newContext the new toUnicode callback context pointer
|
|
* @param oldAction fillin: returns the old callback function pointer
|
|
* @param oldContext fillin: returns the old callback's private void* context
|
|
* @param err The error code status
|
|
* @see ucnv_getToUCallBack
|
|
* @stable
|
|
*/
|
|
U_CAPI void U_EXPORT2
|
|
ucnv_setToUCallBack (UConverter * converter,
|
|
UConverterToUCallback newAction,
|
|
void* newContext,
|
|
UConverterToUCallback *oldAction,
|
|
void** oldContext,
|
|
UErrorCode * err);
|
|
|
|
/**
|
|
* Changes the current callback function used by the converter when
|
|
* an illegal or invalid sequence is found.
|
|
* Context pointers are always owned by the caller.
|
|
*
|
|
* @param converter the unicode converter
|
|
* @param newAction the new callback function
|
|
* @param newContext the new fromUnicode callback context pointer
|
|
* @param oldAction fillin: returns the old callback function pointer
|
|
* @param oldContext fillin: returns the old callback's private void* context
|
|
* @param err The error code status
|
|
* @see ucnv_getFromUCallBack
|
|
* @stable
|
|
*/
|
|
U_CAPI void U_EXPORT2
|
|
ucnv_setFromUCallBack (UConverter * converter,
|
|
UConverterFromUCallback newAction,
|
|
void *newContext,
|
|
UConverterFromUCallback *oldAction,
|
|
void **oldContext,
|
|
UErrorCode * err);
|
|
|
|
/**
|
|
* Converts an array of unicode characters to an array of codepage
|
|
* characters. This function is optimized for converting a continuous
|
|
* stream of data in buffer-sized chunks, where the entire source and
|
|
* target does not fit in available buffers.
|
|
*
|
|
* The source pointer is an in/out parameter. It starts out pointing where the
|
|
* conversion is to begin, and ends up pointing after the last UChar consumed.
|
|
*
|
|
* Target similarly starts out pointer at the first available byte in the output
|
|
* buffer, and ends up pointing after the last byte written to the output.
|
|
*
|
|
* The converter always attempts to consume the entire source buffer, unless
|
|
* (1.) the target buffer is full, or (2.) a failing error is returned from the
|
|
* current callback function. When a successful error status has been
|
|
* returned, it means that all of the source buffer has been
|
|
* consumed. At that point, the caller should reset the source and
|
|
* sourceLimit pointers to point to the next chunk.
|
|
*
|
|
* This is a <I>stateful</I> conversion. Additionally, even when all source data has
|
|
* been consumed, some data may be in the converters' internal state.
|
|
* Call this function repeatedly, updating the target pointers with
|
|
* the next empty chunk of target in case of a
|
|
* <TT>U_BUFFER_OVERFLOW_ERROR</TT>, and updating the source pointers
|
|
* with the next chunk of source when a successful error status is
|
|
* returned, until there are no more chunks of source data.
|
|
* @param converter the Unicode converter
|
|
* @param target I/O parameter. Input : Points to the beginning of the buffer to copy
|
|
* codepage characters to. Output : points to after the last codepage character copied
|
|
* to <TT>target</TT>.
|
|
* @param targetLimit the pointer just after last of the <TT>target</TT> buffer
|
|
* @param source I/O parameter, pointer to pointer to the source Unicode character buffer.
|
|
* @param sourceLimit the pointer just after the last of the source buffer
|
|
* @param offsets if NULL is passed, nothing will happen to it, otherwise it needs to have the same number
|
|
* of allocated cells as <TT>target</TT>. Will fill in offsets from target to source pointer
|
|
* e.g: <TT>offsets[3]</TT> is equal to 6, it means that the <TT>target[3]</TT> was a result of transcoding <TT>source[6]</TT>
|
|
* For output data carried across calls, and other data without a specific source character
|
|
* (such as from escape sequences or callbacks) -1 will be placed for offsets.
|
|
* @param flush set to <TT>TRUE</TT> if the current source buffer is the last available
|
|
* chunk of the source, <TT>FALSE</TT> otherwise. Note that if a failing status is returned,
|
|
* this function may have to be called multiple times wiht flush set to <TT>TRUE</TT> until
|
|
* the source buffer is consumed.
|
|
* @param err the error status. <TT>U_ILLEGAL_ARGUMENT_ERROR</TT> will be set if the
|
|
* converter is <TT>NULL</TT>.
|
|
* <code>U_BUFFER_OVERFLOW_ERROR</code> will be set if the target is full and there is
|
|
* still data to be written to the target.
|
|
* @see ucnv_fromUChars
|
|
* @see ucnv_convert
|
|
* @see ucnv_getMinCharSize
|
|
* @see ucnv_setToUCallBack
|
|
* @draft backslash versus Yen sign in shift-JIS
|
|
*/
|
|
|
|
U_CAPI void U_EXPORT2
|
|
ucnv_fromUnicode (UConverter * converter,
|
|
char **target,
|
|
const char *targetLimit,
|
|
const UChar ** source,
|
|
const UChar * sourceLimit,
|
|
int32_t* offsets,
|
|
UBool flush,
|
|
UErrorCode * err);
|
|
|
|
|
|
/**
|
|
* Converts a buffer of codepage bytes into an array of unicode UChars
|
|
* characters. This function is optimized for converting a continuous
|
|
* stream of data in buffer-sized chunks, where the entire source and
|
|
* target does not fit in available buffers.
|
|
*
|
|
* The source pointer is an in/out parameter. It starts out pointing where the
|
|
* conversion is to begin, and ends up pointing after the last byte of source consumed.
|
|
*
|
|
* Target similarly starts out pointer at the first available UChar in the output
|
|
* buffer, and ends up pointing after the last UChar written to the output.
|
|
* It does NOT necessarily keep UChar sequences together.
|
|
*
|
|
* The converter always attempts to consume the entire source buffer, unless
|
|
* (1.) the target buffer is full, or (2.) a failing error is returned from the
|
|
* current callback function. When a successful error status has been
|
|
* returned, it means that all of the source buffer has been
|
|
* consumed. At that point, the caller should reset the source and
|
|
* sourceLimit pointers to point to the next chunk.
|
|
*
|
|
* This is a <I>stateful</I> conversion. Additionally, even when all source data has
|
|
* been consumed, some data may be in the converters' internal state.
|
|
* Call this function repeatedly, updating the target pointers with
|
|
* the next empty chunk of target in case of a
|
|
* <TT>U_BUFFER_OVERFLOW_ERROR</TT>, and updating the source pointers
|
|
* with the next chunk of source when a successful error status is
|
|
* returned, until there are no more chunks of source data.
|
|
* @param converter the Unicode converter
|
|
* @param target I/O parameter. Input : Points to the beginning of the buffer to copy
|
|
* UChars into. Output : points to after the last UChar copied.
|
|
* @param targetLimit the pointer just after the end of the <TT>target</TT> buffer
|
|
* @param source I/O parameter, pointer to pointer to the source codepage buffer.
|
|
* @param sourceLimit the pointer to the byte after the end of the source buffer
|
|
* @param offsets if NULL is passed, nothing will happen to it, otherwise it needs to have the same number
|
|
* of allocated cells as <TT>target</TT>. Will fill in offsets from target to source pointer
|
|
* e.g: <TT>offsets[3]</TT> is equal to 6, it means that the <TT>target[3]</TT> was a result of transcoding <TT>source[6]</TT>
|
|
* For output data carried across calls, and other data without a specific source character
|
|
* (such as from escape sequences or callbacks) -1 will be placed for offsets.
|
|
* @param flush set to <TT>TRUE</TT> if the current source buffer is the last available
|
|
* chunk of the source, <TT>FALSE</TT> otherwise. Note that if a failing status is returned,
|
|
* this function may have to be called multiple times wiht flush set to <TT>TRUE</TT> until
|
|
* the source buffer is consumed.
|
|
* @param err the error status. <TT>U_ILLEGAL_ARGUMENT_ERROR</TT> will be set if the
|
|
* converter is <TT>NULL</TT>.
|
|
* <code>U_BUFFER_OVERFLOW_ERROR</code> will be set if the target is full and there is
|
|
* still data to be written to the target.
|
|
* @see ucnv_fromUChars
|
|
* @see ucnv_convert
|
|
* @see ucnv_getMinCharSize
|
|
* @see ucnv_setFromUCallBack
|
|
* @see ucnv_getNextUChar
|
|
* @draft backslash versus Yen sign in shift-JIS
|
|
* @stable
|
|
*/
|
|
|
|
U_CAPI void U_EXPORT2
|
|
ucnv_toUnicode (UConverter * converter,
|
|
UChar ** target,
|
|
const UChar * targetLimit,
|
|
const char **source,
|
|
const char *sourceLimit,
|
|
int32_t* offsets,
|
|
UBool flush,
|
|
UErrorCode * err);
|
|
|
|
|
|
/**
|
|
* Converts the source Unicode string into the target codepage with the
|
|
* specified Unicode converter. If any problems during conversion
|
|
* are encountered, the currently installed fromUnicode callback will be used.
|
|
* This function is a more convenient but less efficient version of \Ref{ucnv_fromUnicode}.
|
|
* targetLength may be 0 if you only want to know the exact number of
|
|
* target bytes required.
|
|
* The maximum target buffer size required (barring callbacks) will be
|
|
* sourceLength*ucnv_getMaxCharSize()
|
|
* @param converter the Unicode converter
|
|
* @param target the <TT>target</TT> buffer (<STRONG>not zero-terminated</STRONG>
|
|
* because the structure of codepages varies. There is
|
|
* not a reliable way to produce a terminator.)
|
|
* @param targetCapacity the number of bytes available in the <TT>target</TT> buffer
|
|
* @param source the <TT>source</TT> Unicode string
|
|
* @param sourceLength the length of the source string. If -1 is passed in as the
|
|
* value, the source buffer is a zero terminated string and whole source buffer
|
|
* will be converted.
|
|
* @param err the error status code.
|
|
* <TT>U_ILLEGAL_ARGUMENT_ERROR</TT> is returned if the converter is <TT>NULL</TT>
|
|
* or the source or target string is empty.
|
|
* <code>U_BUFFER_OVERFLOW_ERROR</code> will be set if the target is full and
|
|
* there is still input left in the source.
|
|
* @return number of bytes needed in target, regardless of <TT>targetCapacity</TT>
|
|
* @see ucnv_fromUnicode
|
|
* @see ucnv_convert
|
|
* @draft backslash versus Yen sign in shift-JIS
|
|
*/
|
|
U_CAPI int32_t U_EXPORT2
|
|
ucnv_fromUChars (const UConverter * converter,
|
|
char *target,
|
|
int32_t targetCapacity,
|
|
const UChar * source,
|
|
int32_t sourceLength,
|
|
UErrorCode * err);
|
|
|
|
/**
|
|
* Converts the source string in codepage encoding into the target string in
|
|
* Unicode encoding. For example, if a JIS converter is used, the source
|
|
* string in JIS encoding will be converted into Unicode and placed into
|
|
* the provided target buffer. If any problems during conversion
|
|
* are encountered, the currently installed fromUnicode callback will be used.
|
|
* Barring callbacks which may write longer sequences, the target buffer should
|
|
* be of size 1+(2*(sourceLen / ucnv_getMinCharSize())) because the worst case
|
|
* is that each source sequence is the minimum size, and that sequence produces
|
|
* a surrogate pair. (plus the zero termination).
|
|
* A zero-terminator will be placed at the end of the target buffer.
|
|
* This function is a more convenient but less efficient version of \Ref{ucnv_toUnicode}.
|
|
* @param converter the Unicode converter
|
|
* @param source the source string in codepage encoding
|
|
* @param target the target string in Unicode encoding
|
|
* @param targetCapacity capacity of the target buffer
|
|
* @param sourceSize : Number of bytes in <TT>source</TT> to be transcoded
|
|
* @param err the error status code
|
|
* <TT>U_MEMORY_ALLOCATION_ERROR</TT> will be returned if the
|
|
* the internal process buffer cannot be allocated for transcoding.
|
|
* <TT>U_ILLEGAL_ARGUMENT_ERROR</TT> is returned if the converter is <TT>NULL</TT> or
|
|
* if the source or target string is empty.
|
|
* <code>U_BUFFER_OVERFLOW_ERROR</code> will be set if the target is full and there is still input left in the source.
|
|
* @return the number of UChar needed in target (including the zero terminator)
|
|
* @see ucnv_getNextUChar
|
|
* @see ucnv_toUnicode
|
|
* @see ucnv_convert
|
|
* @stable
|
|
*/
|
|
U_CAPI int32_t U_EXPORT2
|
|
ucnv_toUChars (const UConverter * converter,
|
|
UChar * target,
|
|
int32_t targetCapacity,
|
|
const char *source,
|
|
int32_t sourceSize,
|
|
UErrorCode * err);
|
|
|
|
|
|
/********************************
|
|
* Will convert a codepage buffer into unicode one character at a time.
|
|
* <p>This function was written to be efficient when transcoding small
|
|
* amounts of data at a time.
|
|
* In that case it will be more efficient than \Ref{ucnv_toUnicode}.
|
|
* When converting large buffers use \Ref{ucnv_toUnicode}.</p>
|
|
*
|
|
* <p>Handling of surrogate pairs and supplementary-plane code points:<br>
|
|
* There are two different kinds of codepages that provide mappings for surrogate characters:
|
|
* <ul>
|
|
* <li>Codepages like UTF-8, UTF-32, and GB 18030 provide direct representations for Unicode
|
|
* code points U+10000-U+10ffff as well as for single surrogates U+d800-U+dfff.
|
|
* Each valid sequence will result in exactly one returned code point.
|
|
* If a sequence results in a single surrogate, then that will be returned
|
|
* by itself, even if a neighboring sequence encodes the matching surrogate.</li>
|
|
* <li>Codepages like SCSU and LMBCS (and UTF-16) provide direct representations only for BMP code points
|
|
* including surrogates. Code points in supplementary planes are represented with
|
|
* two sequences, each encoding a surrogate.
|
|
* For these codepages, matching pairs of surrogates will be combined into single
|
|
* code points for returning from this function.
|
|
* (Note that SCSU is actually a mix of these codepage types.)</li>
|
|
* </ul></p>
|
|
*
|
|
* @param converter an open UConverter
|
|
* @param source the address of a pointer to the codepage buffer, will be
|
|
* updated to point after the bytes consumed in the conversion call.
|
|
* @param sourceLimit points to the end of the input buffer
|
|
* @param err fills in error status (see ucnv_toUnicode)
|
|
* <code>U_INDEX_OUTOFBOUNDS_ERROR</code> will be set if the input
|
|
* is empty or does not convert to any output (e.g.: pure state-change
|
|
* codes SI/SO, escape sequences for ISO 2022,
|
|
* or if the callback did not output anything, ...).
|
|
* This function will not set a <code>U_BUFFER_OVERFLOW_ERROR</code> because
|
|
* the "buffer" is the return code. However, there might be subsequent output
|
|
* stored in the converter object
|
|
* that will be returned in following calls to this function.
|
|
* @return a UChar32 resulting from the partial conversion of source
|
|
* @see ucnv_toUnicode
|
|
* @see ucnv_toUChars
|
|
* @see ucnv_convert
|
|
* @stable
|
|
*/
|
|
U_CAPI UChar32 U_EXPORT2
|
|
ucnv_getNextUChar (UConverter * converter,
|
|
const char **source,
|
|
const char * sourceLimit,
|
|
UErrorCode * err);
|
|
|
|
|
|
/**************************
|
|
* Will convert a sequence of bytes from one codepage to another.
|
|
* This is <STRONG>NOT AN EFFICIENT</STRONG> way to transcode.
|
|
* use \Ref{ucnv_toUnicode} and \Ref{ucnv_fromUnicode} for efficiency.
|
|
* @param toConverterName The name of the converter that will be used
|
|
* in conversion from unicode into the output buffer
|
|
* @param fromConverterName: The name of the converter that will be used
|
|
* in conversion from the source buffer into intermediate unicode.
|
|
* @param target Pointer to the output buffer
|
|
* @param targetCapacity capacity of the target, in bytes
|
|
* @param source Pointer to the input buffer
|
|
* @param sourceLength capacity of the source, in bytes
|
|
* @param err error status.
|
|
* <code>U_BUFFER_OVERFLOW_ERROR</code> will be set if the target is full and there is still input left in the source.
|
|
* @return will be filled in with the number of bytes needed in target
|
|
* @see ucnv_fromUnicode
|
|
* @see ucnv_toUnicode
|
|
* @see ucnv_fromUChars
|
|
* @see ucnv_toUChars
|
|
* @see ucnv_getNextUChar
|
|
* @draft backslash versus Yen sign in shift-JIS
|
|
*/
|
|
U_CAPI int32_t U_EXPORT2
|
|
ucnv_convert (const char *toConverterName,
|
|
const char *fromConverterName,
|
|
char *target,
|
|
int32_t targetCapacity,
|
|
const char *source,
|
|
int32_t sourceLength,
|
|
UErrorCode * err);
|
|
|
|
|
|
/**
|
|
* Frees up memory occupied by unused, cached converter shared data.
|
|
*
|
|
* @return the number of cached converters successfully deleted
|
|
* @see ucnv_close
|
|
* @stable
|
|
* @system SYSTEM API
|
|
*/
|
|
U_CAPI int32_t U_EXPORT2
|
|
ucnv_flushCache (void);
|
|
|
|
|
|
/**
|
|
* returns the number of available converters, as per the alias file.
|
|
*
|
|
* @return the number of available converters
|
|
* @see ucnv_getAvailableName
|
|
* @stable
|
|
*/
|
|
U_CAPI int32_t U_EXPORT2
|
|
ucnv_countAvailable (void);
|
|
|
|
/**
|
|
* Gets the name of the specified converter from a list of all converters
|
|
* contaied in the alias file.
|
|
* @param n the index to a converter available on the system (in the range <TT>[0..ucnv_countAvaiable()]</TT>)
|
|
* @return a pointer a string (library owned), or <TT>NULL</TT> if the index is out of bounds.
|
|
* @see ucnv_countAvailable
|
|
* @stable
|
|
*/
|
|
U_CAPI const char* U_EXPORT2
|
|
ucnv_getAvailableName (int32_t n);
|
|
|
|
/**
|
|
* Gives the number of aliases for a given converter or alias name.
|
|
* Note that additional aliases are recognized by ucnv_open().
|
|
* This method only enumerates the listed entries in the alias file.
|
|
* @param alias alias name
|
|
* @param pErrorCode error status
|
|
* @return number of names on alias list for given alias
|
|
* @stable
|
|
*/
|
|
U_CAPI uint16_t
|
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ucnv_countAliases(const char *alias, UErrorCode *pErrorCode);
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/**
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* Gives the name of the alias at given index of alias list.
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* Note that additional aliases are recognized by ucnv_open().
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* This method only enumerates the listed entries in the alias file.
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* @param alias alias name
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* @param n index in alias list
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* @param pErrorCode result of operation
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* @return returns the name of the alias at given index
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* @see ucnv_countAliases
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* @stable
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*/
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U_CAPI const char *
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ucnv_getAlias(const char *alias, uint16_t n, UErrorCode *pErrorCode);
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/**
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* Fill-up the list of alias names for the given alias.
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* Note that additional aliases are recognized by ucnv_open().
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* This method only enumerates the listed entries in the alias file.
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* @param alias alias name
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* @param aliases fill-in list, aliases is a pointer to an array of
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* <code>ucnv_countAliases()</code> string-pointers
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* (<code>const char *</code>) that will be filled in.
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* The strings themselves are owned by the library.
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* @param pErrorCode result of operation
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* @stable
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*/
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U_CAPI void
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ucnv_getAliases(const char *alias, const char **aliases, UErrorCode *pErrorCode);
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/**
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* Gives the number of standards associated to converter names.
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* @return number of standards
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* @stable
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*/
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U_CAPI uint16_t U_EXPORT2
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ucnv_countStandards(void);
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/**
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* Gives the name of the standard at given index of standard list.
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* @param n index in standard list
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* @param pErrorCode result of operation
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* @return returns the name of the standard at given index. Owned by the library.
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* @stable
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*/
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U_CAPI const char * U_EXPORT2
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ucnv_getStandard(uint16_t n, UErrorCode *pErrorCode);
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/**
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* Returns a standard name for a given converter name.
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*
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* @param name original converter name
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* @param standard name of the standard governing the names; MIME and IANA
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* are such standards
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* @return returns the standard converter name;
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* if a standard converter name cannot be determined,
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* then <code>NULL</code> is returned. Owned by the library.
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* @stable
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*/
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U_CAPI const char * U_EXPORT2
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ucnv_getStandardName(const char *name, const char *standard, UErrorCode *pErrorCode);
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/**
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* returns the current default converter name.
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*
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* @return returns the current default converter name;
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* if a default converter name cannot be determined,
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* then <code>NULL</code> is returned.
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* Storage owned by the library
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* @see ucnv_setDefaultName
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* @stable
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*/
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U_CAPI const char * U_EXPORT2
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ucnv_getDefaultName (void);
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/**
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* sets the current default converter name. Caller must own the storage for 'name'
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* and preserve it indefinitely.
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* @param name the converter name to be the default (must exist).
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* @see ucnv_getDefaultName
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* @system SYSTEM API
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*/
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U_CAPI void U_EXPORT2
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ucnv_setDefaultName (const char *name);
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/**
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* Fixes the backslash character mismapping. For example, in SJIS, the backslash
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* character in the ASCII portion is also used to represent the yen currency sign.
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* When mapping from Unicode character 0x005C, it's unclear whether to map the
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* character back to yen or backslash in SJIS. This function will take the input
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* buffer and replace all the yen sign characters with backslash. This is necessary
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* when the user tries to open a file with the input buffer on Windows.
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* This function will test the converter to see whether such mapping is
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* required.
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* @param cnv The converter representing the target codepage.
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* @param source the input buffer to be fixed
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* @param sourceLength the length of the input buffer
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* @see ucnv_isAmbiguous
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* @draft
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*/
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U_CAPI void U_EXPORT2
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ucnv_fixFileSeparator(const UConverter *cnv, UChar* source, int32_t sourceLen);
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/**
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* Determines if the converter contains ambiguous mappings of the same
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* character or not.
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* @return TRUE if the converter contains ambiguous mapping of the same
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* character, FALSE otherwise.
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* @draft
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*/
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U_CAPI UBool U_EXPORT2
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ucnv_isAmbiguous(const UConverter *cnv);
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/**
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* Sets the converter to use fallback mapping or not.
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* @param cnv The converter to set the fallback mapping usage on.
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* @param usesFallback TRUE if the user wants the converter to take advantage of the fallback
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* mapping, FALSE otherwise.
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* @draft
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*/
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U_CAPI void U_EXPORT2 ucnv_setFallback(UConverter *cnv, UBool usesFallback);
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/**
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* Determines if the converter uses fallback mappings or not.
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* @return TRUE if the converter uses fallback, FALSE otherwise.
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* @draft
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*/
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U_CAPI UBool U_EXPORT2 ucnv_usesFallback(const UConverter *cnv);
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#endif
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/*_UCNV*/
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