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scuffed-code/icu4c/source/common/unicode/ucnv.h
Markus Scherer 995a589267 ICU-1864 add BOCU-1 
X-SVN-Rev: 8481
2002-04-17 20:36:53 +00:00

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/*
**********************************************************************
* Copyright (C) 1999-2001, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
* ucnv.h:
* External APIs for the ICU's codeset conversion library
* Bertrand A. Damiba
*
* Modification History:
*
* Date Name Description
* 04/04/99 helena Fixed internal header inclusion.
* 05/11/00 helena Added setFallback and usesFallback APIs.
* 06/29/2000 helena Major rewrite of the callback APIs.
* 12/07/2000 srl Update of documentation
*/
/**
* \file
* \brief C API: Character conversion
*
* <h2>Character Conversion C API </h2>
*
*/
#ifndef UCNV_H
#define UCNV_H
/** Forward declaring the UConverter structure. @stable */
struct UConverter;
/** @stable */
typedef struct UConverter UConverter;
#include "unicode/utypes.h"
#include "unicode/ucnv_err.h"
U_CDECL_BEGIN
/* maximum length of the converter names */
#define UCNV_MAX_CONVERTER_NAME_LENGTH 60
#define UCNV_MAX_FULL_FILE_NAME_LENGTH (600+UCNV_MAX_CONVERTER_NAME_LENGTH)
#define UCNV_SI 0x0F /*Shift in for EBDCDIC_STATEFUL and iso2022 states */
#define UCNV_SO 0x0E /*Shift out for EBDCDIC_STATEFUL and iso2022 states */
/**
* Enum for specifying basic types of converters
* @see ucnv_getType
* @stable
*/
typedef enum {
UCNV_UNSUPPORTED_CONVERTER = -1,
UCNV_SBCS = 0,
UCNV_DBCS = 1,
UCNV_MBCS = 2,
UCNV_LATIN_1 = 3,
UCNV_UTF8 = 4,
UCNV_UTF16_BigEndian = 5,
UCNV_UTF16_LittleEndian = 6,
UCNV_UTF32_BigEndian = 7,
UCNV_UTF32_LittleEndian = 8,
UCNV_EBCDIC_STATEFUL = 9,
UCNV_ISO_2022 = 10,
UCNV_LMBCS_1 = 11,
UCNV_LMBCS_2,
UCNV_LMBCS_3,
UCNV_LMBCS_4,
UCNV_LMBCS_5,
UCNV_LMBCS_6,
UCNV_LMBCS_8,
UCNV_LMBCS_11,
UCNV_LMBCS_16,
UCNV_LMBCS_17,
UCNV_LMBCS_18,
UCNV_LMBCS_19,
UCNV_LMBCS_LAST = UCNV_LMBCS_19,
UCNV_HZ,
UCNV_SCSU,
UCNV_ISCII,
UCNV_US_ASCII,
UCNV_UTF7,
UCNV_BOCU1,
/* Number of converter types for which we have conversion routines. */
UCNV_NUMBER_OF_SUPPORTED_CONVERTER_TYPES
} UConverterType;
/**
* Enum for specifying which platform a converter ID refers to.
* The use of platform/CCSID is not recommended. See ucnv_openCCSID().
*
* @see ucnv_getPlatform
* @see ucnv_openCCSID
* @see ucnv_getCCSID
* @stable
*/
typedef enum {
UCNV_UNKNOWN = -1,
UCNV_IBM = 0
} UConverterPlatform;
/**
* Function pointer for error callback in the codepage to unicode direction.
* Called when an error has occured in conversion to unicode, or on open/close of the callback (see reason).
* @param context Pointer to the callback's private data
* @param args Information about the conversion in progress
* @param codePoints Points to 'length' bytes of the concerned codepage sequence
* @param length Size (in bytes) of the concerned codepage sequence
* @param reason Defines the reason the callback was invoked
* @see ucnv_setToUCallBack
* @see UConverterToUnicodeArgs
* @stable
*/
typedef void (U_EXPORT2 *UConverterToUCallback) (
const void* context,
UConverterToUnicodeArgs *args,
const char *codePoints,
int32_t length,
UConverterCallbackReason reason,
UErrorCode *);
/**
* Function pointer for error callback in the unicode to codepage direction.
* Called when an error has occured in conversion from unicode, or on open/close of the callback (see reason).
* @param context Pointer to the callback's private data
* @param args Information about the conversion in progress
* @param codeUnits Points to 'length' UChars of the concerned Unicode sequence
* @param length Size (in bytes) of the concerned codepage sequence
* @param codePoint Single UChar32 (UTF-32) containing the concerend Unicode codepoint.
* @param reason Defines the reason the callback was invoked
* @see ucnv_setFromUCallBack
* @stable
*/
typedef void (U_EXPORT2 *UConverterFromUCallback) (
const void* context,
UConverterFromUnicodeArgs *args,
const UChar* codeUnits,
int32_t length,
UChar32 codePoint,
UConverterCallbackReason reason,
UErrorCode *);
U_CDECL_END
/**
* Character that separates converter names from options and options from each other.
* @see ucnv_open
* @stable
*/
#define UCNV_OPTION_SEP_CHAR ','
/**
* String version of UCNV_OPTION_SEP_CHAR.
* @see ucnv_open
* @stable
*/
#define UCNV_OPTION_SEP_STRING ","
/**
* Character that separates a converter option from its value.
* @see ucnv_open
* @stable
*/
#define UCNV_VALUE_SEP_CHAR '='
/**
* String version of UCNV_VALUE_SEP_CHAR.
* @see ucnv_open
* @stable
*/
#define UCNV_VALUE_SEP_STRING "="
/**
* Converter option for specifying a locale.
* @see ucnv_open
* @stable
*/
#define UCNV_LOCALE_OPTION_STRING ",locale="
/**
* Do a fuzzy compare of a two converter/alias names. The comparison
* is case-insensitive. It also ignores the characters '-', '_', and
* ' ' (dash, underscore, and space). Thus the strings "UTF-8",
* "utf_8", and "Utf 8" are exactly equivalent.
*
* @param name1 a converter name or alias, zero-terminated
* @param name2 a converter name or alias, zero-terminated
* @return 0 if the names match, or a negative value if the name1
* lexically precedes name2, or a positive value if the name1
* lexically follows name2.
* @stable
*/
U_CAPI int U_EXPORT2
ucnv_compareNames(const char *name1, const char *name2);
/**
* Creates a UConverter object with the names specified as a C string.
* The actual name will be resolved with the alias file
* using a case-insensitive string comparison that ignores
* the delimiters '-', '_', and ' ' (dash, underscore, and space).
* E.g., the names "UTF8", "utf-8", and "Utf 8" are all equivalent.
* If <code>NULL</code> is passed for the converter name, it will create one with the
* getDefaultName return value.
*
* <p>A converter name for ICU 1.5 and above may contain options
* like a locale specification to control the specific behavior of
* the newly instantiated converter.
* The meaning of the options depends on the particular converter.
* If an option is not defined for or recognized by a given converter, then it is ignored.</p>
*
* <p>Options are appended to the converter name string, with a
* <code>UCNV_OPTION_SEP_CHAR</code> between the name and the first option and
* also between adjacent options.</p>
*
* @param converterName : name of the uconv table, may have options appended
* @param err outgoing error status <TT>U_MEMORY_ALLOCATION_ERROR, U_FILE_ACCESS_ERROR</TT>
* @return the created Unicode converter object, or <TT>NULL</TT> if an error occured
* @see ucnv_openU
* @see ucnv_openCCSID
* @see ucnv_close
* @stable
*/
U_CAPI UConverter* U_EXPORT2
ucnv_open (const char *converterName, UErrorCode * err);
/**
* Creates a Unicode converter with the names specified as unicode string.
* The name should be limited to the ASCII-7 alphanumerics range.
* The actual name will be resolved with the alias file
* using a case-insensitive string comparison that ignores
* the delimiters '-', '_', and ' ' (dash, underscore, and space).
* E.g., the names "UTF8", "utf-8", and "Utf 8" are all equivalent.
* If <TT>NULL</TT> is passed for the converter name, it will create
* one with the ucnv_getDefaultName() return value.
* @param converterName : name of the uconv table in a zero terminated
* Unicode string
* @param err outgoing error status <TT>U_MEMORY_ALLOCATION_ERROR,
* U_FILE_ACCESS_ERROR</TT>
* @return the created Unicode converter object, or <TT>NULL</TT> if an
* error occured
* @see ucnv_open
* @see ucnv_openCCSID
* @see ucnv_close
* @see ucnv_getDefaultName
* @stable
*/
U_CAPI UConverter* U_EXPORT2
ucnv_openU (const UChar * name,
UErrorCode * err);
/**
* Creates a UConverter object from a CCSID number and platform pair.
* Note that the usefulness of this function is limited to platforms with numeric
* encoding IDs. Only IBM and Microsoft platforms use numeric (16-bit) identifiers for
* encodings.
*
* In addition, IBM CCSIDs and Unicode conversion tables are not 1:1 related.
* For many IBM CCSIDs there are multiple (up to six) Unicode conversion tables, and
* for some Unicode conversion tables there are multiple CCSIDs.
* Some "alternate" Unicode conversion tables are provided by the
* IBM CDRA conversion table registry.
* The most prominent example of a systematic modification of conversion tables that is
* not provided in the form of conversion table files in the repository is
* that S/390 Unix System Services swaps the codes for Line Feed and New Line in all
* EBCDIC codepages, which requires such a swap in the Unicode conversion tables as well.
*
* Only IBM default conversion tables are accessible with ucnv_openCCSID().
* ucnv_getCCSID() will return the same CCSID for all conversion tables that are associated
* with that CCSID.
*
* Currently, the only "platform" supported in the ICU converter API is UCNV_IBM.
*
* In summary, the use of CCSIDs and the associated API functions is not recommended.
*
* In order to open a converter with the default IBM CDRA Unicode conversion table,
* you can use this function or use the prefix "ibm-":
* \code
* char name[20];
* sprintf(name, "ibm-%hu", ccsid);
* cnv=ucnv_open(name, &errorCode);
* \endcode
*
* In order to open a converter with the IBM S/390 Unix System Services variant of a Unicode/EBCDIC conversion table,
* you can use the prefix "ibm-" together with the suffix "-s390":
* \code
* char name[20];
* sprintf(name, "ibm-%hu-s390", ccsid);
* cnv=ucnv_open(name, &errorCode);
* \endcode
*
* In order to open a converter from a Microsoft codepage number, use the prefix "cp":
* \code
* char name[20];
* sprintf(name, "cp%hu", codepageID);
* cnv=ucnv_open(name, &errorCode);
* \endcode
*
* @param codepage codepage number to create
* @param platform the platform in which the codepage number exists
* @param err error status <TT>U_MEMORY_ALLOCATION_ERROR, U_FILE_ACCESS_ERROR</TT>
* @return the created Unicode converter object, or <TT>NULL</TT> if an error
* occured.
* @see ucnv_open
* @see ucnv_openU
* @see ucnv_close
* @see ucnv_getCCSID
* @see ucnv_getPlatform
* @see UConverterPlatform
* @stable
*/
U_CAPI UConverter* U_EXPORT2
ucnv_openCCSID (int32_t codepage,
UConverterPlatform platform,
UErrorCode * err);
/**
* Thread safe cloning operation
* @param cnv converter to be cloned
* @param stackBuffer user allocated space for the new clone. If NULL new memory will be allocated.
* If buffer is not large enough, new memory will be allocated.
* Clients can use the U_CNV_SAFECLONE_BUFFERSIZE. This will probably be enough to avoid memory allocations.
* @param pBufferSize pointer to size of allocated space.
* If *pBufferSize == 0, a sufficient size for use in cloning will
* be returned ('pre-flighting')
* If *pBufferSize is not enough for a stack-based safe clone,
* new memory will be allocated.
* @param status to indicate whether the operation went on smoothly or there were errors
* An informational status value, U_SAFECLONE_ALLOCATED_ERROR, is used if any allocations were necessary.
* @return pointer to the new clone
* @draft ICU 1.8
*/
U_CAPI UConverter * U_EXPORT2
ucnv_safeClone(const UConverter *cnv,
void *stackBuffer,
int32_t *pBufferSize,
UErrorCode *status);
/** @draft ICU 1.8 */
#define U_CNV_SAFECLONE_BUFFERSIZE 512
/**
* Deletes the unicode converter and releases resources associated
* with just this instance.
* Does not free up shared converter tables.
*
* @param converter the converter object to be deleted
* @see ucnv_open
* @see ucnv_openU
* @see ucnv_openCCSID
* @stable
*/
U_CAPI void U_EXPORT2
ucnv_close (UConverter * converter);
/**
* Fills in the output parameter, subChars, with the substitution characters
* as multiple bytes.
*
* @param converter the Unicode converter
* @param subChars the subsitution characters
* @param len on input the capacity of subChars, on output the number
* of bytes copied to it
* @param err the outgoing error status code.
* If the substitution character array is too small, an
* <TT>U_INDEX_OUTOFBOUNDS_ERROR</TT> will be returned.
* @see ucnv_setSubstChars
* @stable
*/
U_CAPI void U_EXPORT2
ucnv_getSubstChars (const UConverter * converter,
char *subChars,
int8_t * len,
UErrorCode * err);
/**
* Sets the substitution chars when converting from unicode to a codepage. The
* substitution is specified as a string of 1-4 bytes, and may contain
* <TT>NULL</TT> byte.
* @param converter the Unicode converter
* @param subChars the substitution character byte sequence we want set
* @param len the number of bytes in subChars
* @param err the error status code. <TT>U_INDEX_OUTOFBOUNDS_ERROR </TT> if
* len is bigger than the maximum number of bytes allowed in subchars
* @see ucnv_getSubstChars
* @stable
*/
U_CAPI void U_EXPORT2
ucnv_setSubstChars (UConverter * converter,
const char *subChars,
int8_t len,
UErrorCode * err);
/**
* Fills in the output parameter, errBytes, with the error characters from the
* last failing conversion.
*
* @param converter the Unicode converter
* @param errBytes the codepage bytes which were in error
* @param len on input the capacity of errBytes, on output the number of
* bytes which were copied to it
* @param err the error status code.
* If the substitution character array is too small, an
* <TT>U_INDEX_OUTOFBOUNDS_ERROR</TT> will be returned.
* @stable
*/
U_CAPI void U_EXPORT2
ucnv_getInvalidChars (const UConverter * converter,
char *errBytes,
int8_t * len,
UErrorCode * err);
/**
* Fills in the output parameter, errChars, with the error characters from the
* last failing conversion.
*
* @param converter the Unicode converter
* @param errUChars the UChars which were in error
* @param len on input the capacity of errUChars, on output the number of
* UChars which were copied to it
* @param err the error status code.
* If the substitution character array is too small, an
* <TT>U_INDEX_OUTOFBOUNDS_ERROR</TT> will be returned.
* @stable
*/
U_CAPI void U_EXPORT2
ucnv_getInvalidUChars (const UConverter * converter,
UChar *errUChars,
int8_t * len,
UErrorCode * err);
/**
* Resets the state of a converter to the default state. This is used
* in the case of an error, to restart a conversion from a known default state.
* It will also empty the internal output buffers.
* @param converter the Unicode converter
* @stable
*/
U_CAPI void U_EXPORT2
ucnv_reset (UConverter * converter);
/**
* Resets the to-Unicode part of a converter state to the default state.
* This is used in the case of an error to restart a conversion to
* Unicode to a known default state. It will also empty the internal
* output buffers used for the conversion to Unicode codepoints.
* @param converter the Unicode converter
* @draft ICU 1.8
*/
U_CAPI void U_EXPORT2
ucnv_resetToUnicode(UConverter *converter);
/**
* Resets the from-Unicode part of a converter state to the default state.
* This is used in the case of an error to restart a conversion from
* Unicode to a known default state. It will also empty the internal output
* buffers used for the conversion from Unicode codepoints.
* @param converter the Unicode converter
* @draft ICU 1.8
*/
U_CAPI void U_EXPORT2
ucnv_resetFromUnicode(UConverter *converter);
/**
* Returns the maximum length of bytes used by a character. This varies
* between 1 and 4
* @param converter the Unicode converter
* @return the maximum number of bytes allowed by this particular converter
* @see ucnv_getMinCharSize
* @stable
*/
U_CAPI int8_t U_EXPORT2
ucnv_getMaxCharSize (const UConverter * converter);
/**
* Returns the minimum byte length for characters in this codepage.
* This is either 1 or 2 for all supported codepages.
* @param converter the Unicode converter
* @return the minimum number of bytes allowed by this particular converter
* @see ucnv_getMaxCharSize
* @stable
*/
U_CAPI int8_t U_EXPORT2
ucnv_getMinCharSize (const UConverter * converter);
/**
* Returns the display name of the converter passed in based on the Locale
* passed in. If the locale contains no display name, the internal ASCII
* name will be filled in.
*
* @param converter the Unicode converter.
* @param displayLocale is the specific Locale we want to localised for
* @param displayName user provided buffer to be filled in
* @param displayNameCapacty size of displayName Buffer
* @param err error status code
* @return displayNameLength number of UChar needed in displayName
* @see ucnv_getName
* @stable
*/
U_CAPI int32_t U_EXPORT2
ucnv_getDisplayName (const UConverter * converter,
const char *displayLocale,
UChar * displayName,
int32_t displayNameCapacity,
UErrorCode * err);
/**
* Gets the internal, canonical name of the converter (zero-terminated).
* The lifetime of the returned string will be that of the converter
* passed to this function.
* @param converter the Unicode converter
* @param err UErrorCode status
* @return the internal name of the converter
* @see ucnv_getDisplayName
* @stable
*/
U_CAPI const char * U_EXPORT2
ucnv_getName (const UConverter * converter, UErrorCode * err);
/**
* Gets a codepage number associated with the converter. This is not guaranteed
* to be the one used to create the converter. Some converters do not represent
* platform registered codepages and return zero for the codepage number.
* The error code fill-in parameter indicates if the codepage number
* is available.
* Does not check if the converter is <TT>NULL</TT> or if converter's data
* table is <TT>NULL</TT>.
*
* Important: The use of CCSIDs is not recommended because it is limited
* to only two platforms in principle and only one (UCNV_IBM) in the current
* ICU converter API.
* Also, CCSIDs are insufficient to identify IBM Unicode conversion tables precisely.
* For more details see ucnv_openCCSID().
*
* @param converter the Unicode converter
* @param err the error status code.
* @return If any error occurrs, -1 will be returned otherwise, the codepage number
* will be returned
* @see ucnv_openCCSID
* @see ucnv_getPlatform
* @stable
*/
U_CAPI int32_t U_EXPORT2
ucnv_getCCSID (const UConverter * converter,
UErrorCode * err);
/**
* Gets a codepage platform associated with the converter. Currently,
* only <TT>UCNV_IBM</TT> will be returned.
* Does not test if the converter is <TT>NULL</TT> or if converter's data
* table is <TT>NULL</TT>.
* @param converter the Unicode converter
* @param err the error status code.
* @return The codepage platform
* @stable
*/
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,
const 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,
const 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,
const void* newContext,
UConverterToUCallback *oldAction,
const 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,
const void *newContext,
UConverterFromUCallback *oldAction,
const 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
* @stable
*/
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
* @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);
/**
* Convert the Unicode string into a codepage string using an existing UConverter.
* The output string is NUL-terminated if possible.
*
* This function is a more convenient but less powerful version of ucnv_fromUnicode().
* It is only useful for whole strings, not for streaming conversion.
*
* The maximum output buffer capacity required (barring output from callbacks) will be
* srcLength*ucnv_getMaxCharSize(cnv).
*
* @param cnv the converter object to be used (ucnv_resetFromUnicode() will be called)
* @param src the input Unicode string
* @param srcLength the input string length, or -1 if NUL-terminated
* @param dest destination string buffer, can be NULL if destCapacity==0
* @param destCapacity the number of chars available at dest
* @param errorCode normal ICU error code;
* common error codes that may be set by this function include
* U_BUFFER_OVERFLOW_ERROR, U_STRING_NOT_TERMINATED_WARNING,
* U_ILLEGAL_ARGUMENT_ERROR, and conversion errors
* @return the length of the output string, not counting the terminating NUL;
* if the length is greater than destCapacity, then the string will not fit
* and a buffer of the indicated length would need to be passed in
* @see ucnv_fromUnicode
* @see ucnv_convert
* @draft ICU 2.0 (new NUL-termination semantics)
*/
U_CAPI int32_t U_EXPORT2
ucnv_fromUChars(UConverter *cnv,
char *dest, int32_t destCapacity,
const UChar *src, int32_t srcLength,
UErrorCode *pErrorCode);
/**
* Convert the codepage string into a Unicode string using an existing UConverter.
* The output string is NUL-terminated if possible.
*
* This function is a more convenient but less powerful version of ucnv_toUnicode().
* It is only useful for whole strings, not for streaming conversion.
*
* The maximum output buffer capacity required (barring output from callbacks) will be
* 2*srcLength (each char may be converted into a surrogate pair).
*
* @param cnv the converter object to be used (ucnv_resetToUnicode() will be called)
* @param src the input codepage string
* @param srcLength the input string length, or -1 if NUL-terminated
* @param dest destination string buffer, can be NULL if destCapacity==0
* @param destCapacity the number of UChars available at dest
* @param errorCode normal ICU error code;
* common error codes that may be set by this function include
* U_BUFFER_OVERFLOW_ERROR, U_STRING_NOT_TERMINATED_WARNING,
* U_ILLEGAL_ARGUMENT_ERROR, and conversion errors
* @return the length of the output string, not counting the terminating NUL;
* if the length is greater than destCapacity, then the string will not fit
* and a buffer of the indicated length would need to be passed in
* @see ucnv_toUnicode
* @see ucnv_convert
* @draft ICU 2.0 (new NUL-termination semantics)
*/
U_CAPI int32_t U_EXPORT2
ucnv_toUChars(UConverter *cnv,
UChar *dest, int32_t destCapacity,
const char *src, int32_t srcLength,
UErrorCode *pErrorCode);
/**
* 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
* @stable
*/
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
*/
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 U_EXPORT2
ucnv_countAliases(const char *alias, UErrorCode *pErrorCode);
/**
* Gives the name of the alias at given index of alias list.
* 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 n index in alias list
* @param pErrorCode result of operation
* @return returns the name of the alias at given index
* @see ucnv_countAliases
* @stable
*/
U_CAPI const char * U_EXPORT2
ucnv_getAlias(const char *alias, uint16_t n, UErrorCode *pErrorCode);
/**
* Fill-up the list of alias names for the given alias.
* 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 aliases fill-in list, aliases is a pointer to an array of
* <code>ucnv_countAliases()</code> string-pointers
* (<code>const char *</code>) that will be filled in.
* The strings themselves are owned by the library.
* @param pErrorCode result of operation
* @stable
*/
U_CAPI void U_EXPORT2
ucnv_getAliases(const char *alias, const char **aliases, UErrorCode *pErrorCode);
/**
* Gives the number of standards associated to converter names.
* @return number of standards
* @stable
*/
U_CAPI uint16_t U_EXPORT2
ucnv_countStandards(void);
/**
* Gives the name of the standard at given index of standard list.
* @param n index in standard list
* @param pErrorCode result of operation
* @return returns the name of the standard at given index. Owned by the library.
* @stable
*/
U_CAPI const char * U_EXPORT2
ucnv_getStandard(uint16_t n, UErrorCode *pErrorCode);
/**
* Returns a standard name for a given converter name.
*
* @param name original converter name
* @param standard name of the standard governing the names; MIME and IANA
* are such standards
* @return returns the standard converter name;
* if a standard converter name cannot be determined,
* then <code>NULL</code> is returned. Owned by the library.
* @stable
*/
U_CAPI const char * U_EXPORT2
ucnv_getStandardName(const char *name, const char *standard, UErrorCode *pErrorCode);
/**
* returns the current default converter name.
*
* @return returns the current default converter name;
* if a default converter name cannot be determined,
* then <code>NULL</code> is returned.
* Storage owned by the library
* @see ucnv_setDefaultName
* @stable
*/
U_CAPI const char * U_EXPORT2
ucnv_getDefaultName (void);
/**
* sets the current default converter name. Caller must own the storage for 'name'
* and preserve it indefinitely.
* @param name the converter name to be the default (must exist).
* @see ucnv_getDefaultName
* @system SYSTEM API
* @stable
*/
U_CAPI void U_EXPORT2
ucnv_setDefaultName (const char *name);
/**
* Fixes the backslash character mismapping. For example, in SJIS, the backslash
* character in the ASCII portion is also used to represent the yen currency sign.
* When mapping from Unicode character 0x005C, it's unclear whether to map the
* character back to yen or backslash in SJIS. This function will take the input
* buffer and replace all the yen sign characters with backslash. This is necessary
* when the user tries to open a file with the input buffer on Windows.
* This function will test the converter to see whether such mapping is
* required. You can sometimes avoid using this function by using the correct version
* of Shift-JIS.
*
* @param cnv The converter representing the target codepage.
* @param source the input buffer to be fixed
* @param sourceLength the length of the input buffer
* @see ucnv_isAmbiguous
* @stable
*/
U_CAPI void U_EXPORT2
ucnv_fixFileSeparator(const UConverter *cnv, UChar* source, int32_t sourceLen);
/**
* Determines if the converter contains ambiguous mappings of the same
* character or not.
* @return TRUE if the converter contains ambiguous mapping of the same
* character, FALSE otherwise.
* @stable
*/
U_CAPI UBool U_EXPORT2
ucnv_isAmbiguous(const UConverter *cnv);
/**
* Sets the converter to use fallback mapping or not.
* @param cnv The converter to set the fallback mapping usage on.
* @param usesFallback TRUE if the user wants the converter to take advantage of the fallback
* mapping, FALSE otherwise.
* @stable
*/
U_CAPI void U_EXPORT2
ucnv_setFallback(UConverter *cnv, UBool usesFallback);
/**
* Determines if the converter uses fallback mappings or not.
* @return TRUE if the converter uses fallback, FALSE otherwise.
* @stable
*/
U_CAPI UBool U_EXPORT2
ucnv_usesFallback(const UConverter *cnv);
/**
* Detects Unicode signatures in the given byte stream. The signature bytes are not consumed,
* instead the number of bytes that make up the signature is returned. The conversion APIs
* donot discard signature bytes, so if the caller wishes to discard them, the caller should
* explicity add code to do that after calling this function.
* <p>
* Usage:
* @code
* UErrorCode err = U_ZERO_ERROR;
* char input[] = { '\xEF','\xBB', '\xBF','\x41','\x42','\x43' };
* char* source = input;
* int32_t signatureLength = 0;
* char* encoding = ucnv_detectUnicodeSignatures(source,sizeof(input),&signatureLength,&err);
* UConverter* conv = NULL;
* if(encoding!=NULL && U_SUCCESS(err)){
* // should signature be discarded ?
* if (discardSignature){
* source += signatureLength;
* }
* conv = ucnv_open(encoding, &err);
* .... do the conversion ....
* }
*
* @endcode
*
* @param source The source string in which the signature should be detected.
* @param sourceLength Length of the input string, or -1 if NUL-terminated.
* @param signatureLength A pointer to int8_t to receive the number of bytes that make up the signature
* of the detected UTF. 0 if not detected.
* @param pErrorCode A pointer to receive information about any errors that may occur during detection.
* Must be a valid pointer to an error code value, which must not indicate a failure
* before the function call.
* @return The name of the encoding detected. NULL if encoding is not detected.
*/
U_CAPI const char* U_EXPORT2
ucnv_detectUnicodeSignature( const char* source,
int32_t sourceLength,
int32_t* signatureLength,
UErrorCode* pErrorCode);
#endif
/*_UCNV*/
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