This API is used to convert codepage or character encoded data to and + * from UTF-16. You can open a converter with {@link ucnv_open() }. With that + * converter, you can get its properties, set options, convert your data and + * close the converter.
+ * + *Since many software programs recogize different converter names for + * different types of converters, there are other functions in this API to + * iterate over the converter aliases. The functions {@link ucnv_getAvailableName() }, + * {@link ucnv_getAlias() } and {@link ucnv_getStandardName() } are some of the + * more frequently used alias functions to get this information.
+ * + *When a converter encounters an illegal, irregular, invalid or unmappable character + * its default behavior is to use a substitution character to replace the + * bad byte sequence. This behavior can be changed by using {@link ucnv_getFromUCallBack() } + * or {@link ucnv_getToUCallBack() } on the converter. The header ucnv_err.h defines + * many other callback actions that can be used instead of a character substitution.
+ * + *More information about this API can be found in our + * User's + * Guide.
+ */ + +#ifndef UCNV_H +#define UCNV_H + +#include "unicode/ucnv_err.h" +#include "unicode/uenum.h" + +#ifndef __USET_H__ + +/** + * USet is the C API type for Unicode sets. + * It is forward-declared here to avoid including the header file if related + * conversion APIs are not used. + * See unicode/uset.h + * + * @see ucnv_getUnicodeSet + * @stable ICU 2.6 + */ +struct USet; +/** @stable ICU 2.6 */ +typedef struct USet USet; + +#endif + +#if !UCONFIG_NO_CONVERSION + +U_CDECL_BEGIN + +/** Maximum length of a converter name including the terminating NULL @stable ICU 2.0 */ +#define UCNV_MAX_CONVERTER_NAME_LENGTH 60 +/** Maximum length of a converter name including path and terminating NULL @stable ICU 2.0 */ +#define UCNV_MAX_FULL_FILE_NAME_LENGTH (600+UCNV_MAX_CONVERTER_NAME_LENGTH) + +/** Shift in for EBDCDIC_STATEFUL and iso2022 states @stable ICU 2.0 */ +#define UCNV_SI 0x0F +/** Shift out for EBDCDIC_STATEFUL and iso2022 states @stable ICU 2.0 */ +#define UCNV_SO 0x0E + +/** + * Enum for specifying basic types of converters + * @see ucnv_getType + * @stable ICU 2.0 + */ +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, + UCNV_UTF16, + UCNV_UTF32, + UCNV_CESU8, + UCNV_IMAP_MAILBOX, + + /* 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 ICU 2.0 + */ +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 codeUnits 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 ICU 2.0 + */ +typedef void (U_EXPORT2 *UConverterToUCallback) ( + const void* context, + UConverterToUnicodeArgs *args, + const char *codeUnits, + 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 ICU 2.0 + */ +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 ICU 2.0 + */ +#define UCNV_OPTION_SEP_CHAR ',' + +/** + * String version of UCNV_OPTION_SEP_CHAR. + * @see ucnv_open + * @stable ICU 2.0 + */ +#define UCNV_OPTION_SEP_STRING "," + +/** + * Character that separates a converter option from its value. + * @see ucnv_open + * @stable ICU 2.0 + */ +#define UCNV_VALUE_SEP_CHAR '=' + +/** + * String version of UCNV_VALUE_SEP_CHAR. + * @see ucnv_open + * @stable ICU 2.0 + */ +#define UCNV_VALUE_SEP_STRING "=" + +/** + * Converter option for specifying a locale. + * For example, ucnv_open("SCSU,locale=ja", &errorCode); + * See convrtrs.txt. + * + * @see ucnv_open + * @stable ICU 2.0 + */ +#define UCNV_LOCALE_OPTION_STRING ",locale=" + +/** + * Converter option for specifying a version selector (0..9) for some converters. + * For example, ucnv_open("UTF-7,version=1", &errorCode); + * See convrtrs.txt. + * + * @see ucnv_open + * @stable ICU 2.4 + */ +#define UCNV_VERSION_OPTION_STRING ",version=" + +/** + * Converter option for EBCDIC SBCS or mixed-SBCS/DBCS (stateful) codepages. + * Swaps Unicode mappings for EBCDIC LF and NL codes, as used on + * S/390 (z/OS) Unix System Services (Open Edition). + * For example, ucnv_open("ibm-1047,swaplfnl", &errorCode); + * See convrtrs.txt. + * + * @see ucnv_open + * @stable ICU 2.4 + */ +#define UCNV_SWAP_LFNL_OPTION_STRING ",swaplfnl" + +/** + * 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 ICU 2.0 + */ +U_STABLE 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. + * IfNULL is passed for the converter name, it will create one with the
+ * getDefaultName return value.
+ *
+ * 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.
+ * + *Options are appended to the converter name string, with a
+ * UCNV_OPTION_SEP_CHAR between the name and the first option and
+ * also between adjacent options.
If the alias is ambiguous, then the preferred converter is used + * and the status is set to U_AMBIGUOUS_ALIAS_WARNING.
+ * + *The conversion behavior and names can vary between platforms. ICU may + * convert some characters differently from other platforms. Details on this topic + * are in the User's + * Guide.
+ * + * @param converterName Name of the uconv table, may have options appended + * @param err outgoing error status U_MEMORY_ALLOCATION_ERROR, U_FILE_ACCESS_ERROR + * @return the created Unicode converter object, or NULL if an error occured + * @see ucnv_openU + * @see ucnv_openCCSID + * @see ucnv_close + * @stable ICU 2.0 + */ +U_STABLE 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 NULL is passed for the converter name, it will create + * one with the ucnv_getDefaultName() return value. + * If the alias is ambiguous, then the preferred converter is used + * and the status is set to U_AMBIGUOUS_ALIAS_WARNING. + * @param name : name of the uconv table in a zero terminated + * Unicode string + * @param err outgoing error status U_MEMORY_ALLOCATION_ERROR, + * U_FILE_ACCESS_ERROR + * @return the created Unicode converter object, or NULL if an + * error occured + * @see ucnv_open + * @see ucnv_openCCSID + * @see ucnv_close + * @see ucnv_getDefaultName + * @stable ICU 2.0 + */ +U_STABLE 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 option string UCNV_SWAP_LFNL_OPTION_STRING: + * \code + * char name[20]; + * sprintf(name, "ibm-%hu" UCNV_SWAP_LFNL_OPTION_STRING, 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 + * + * If the alias is ambiguous, then the preferred converter is used + * and the status is set to U_AMBIGUOUS_ALIAS_WARNING. + * + * @param codepage codepage number to create + * @param platform the platform in which the codepage number exists + * @param err error status U_MEMORY_ALLOCATION_ERROR, U_FILE_ACCESS_ERROR + * @return the created Unicode converter object, or NULL if an error + * occured. + * @see ucnv_open + * @see ucnv_openU + * @see ucnv_close + * @see ucnv_getCCSID + * @see ucnv_getPlatform + * @see UConverterPlatform + * @stable ICU 2.0 + */ +U_STABLE UConverter* U_EXPORT2 +ucnv_openCCSID(int32_t codepage, + UConverterPlatform platform, + UErrorCode * err); + +/** + *Creates a UConverter object specified from a packageName and a converterName.
+ * + *The packageName and converterName must point to an ICU udata object, as defined by
+ * udata_open( packageName, "cnv", converterName, err) or equivalent.
+ * Typically, packageName will refer to a (.dat) file, or to a package registered with
+ * udata_setAppData().
The name will NOT be looked up in the alias mechanism, nor will the converter be + * stored in the converter cache or the alias table. The only way to open further converters + * is call this function multiple times, or use the ucnv_safeClone() function to clone a + * 'master' converter.
+ * + *A future version of ICU may add alias table lookups and/or caching + * to this function.
+ * + *Example Use:
+ * cnv = ucnv_openPackage("myapp", "myconverter", &err);
+ *
U_BUFFER_OVERFLOW_ERROR 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 ICU 2.0
+ */
+U_STABLE 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.
+ *
+ * At the end of the stream (flush==TRUE), the input is completely consumed
+ * when *source==sourceLimit and no error code is set
+ * The converter object is then automatically reset by this function.
+ * (This means that a converter need not be reset explicitly between data
+ * streams if it finishes the previous stream without errors.)
+ *
+ * This is a stateful 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
+ * U_BUFFER_OVERFLOW_ERROR, 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 target 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 target. Will fill in offsets from target to source pointer
+ * e.g: offsets[3] is equal to 6, it means that the target[3] was a result of transcoding source[6]
+ * 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 TRUE if the current source buffer is the last available
+ * chunk of the source, FALSE otherwise. Note that if a failing status is returned,
+ * this function may have to be called multiple times with flush set to TRUE until
+ * the source buffer is consumed.
+ * @param err the error status. U_ILLEGAL_ARGUMENT_ERROR will be set if the
+ * converter is NULL.
+ * U_BUFFER_OVERFLOW_ERROR 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 ICU 2.0
+ */
+U_STABLE 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
+ * UCNV_GET_MAX_BYTES_FOR_STRING(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 pErrorCode 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
+ * @see UCNV_GET_MAX_BYTES_FOR_STRING
+ * @stable ICU 2.0
+ */
+U_STABLE 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 pErrorCode 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
+ * @stable ICU 2.0
+ */
+U_STABLE int32_t U_EXPORT2
+ucnv_toUChars(UConverter *cnv,
+ UChar *dest, int32_t destCapacity,
+ const char *src, int32_t srcLength,
+ UErrorCode *pErrorCode);
+
+/**
+ * Convert a codepage buffer into Unicode one character at a time.
+ * The input is completely consumed when the U_INDEX_OUTOFBOUNDS_ERROR is set.
+ *
+ * Advantage compared to ucnv_toUnicode() or ucnv_toUChars():
+ * - Faster for small amounts of data, for most converters, e.g.,
+ * US-ASCII, ISO-8859-1, UTF-8/16/32, and most "normal" charsets.
+ * (For complex converters, e.g., SCSU, UTF-7 and ISO 2022 variants,
+ * it uses ucnv_toUnicode() internally.)
+ * - Convenient.
+ *
+ * Limitations compared to ucnv_toUnicode():
+ * - Always assumes flush=TRUE.
+ * This makes ucnv_getNextUChar() unsuitable for "streaming" conversion,
+ * that is, for where the input is supplied in multiple buffers,
+ * because ucnv_getNextUChar() will assume the end of the input at the end
+ * of the first buffer.
+ * - Does not provide offset output.
+ *
+ * It is possible to "mix" ucnv_getNextUChar() and ucnv_toUnicode() because
+ * ucnv_getNextUChar() uses the current state of the converter
+ * (unlike ucnv_toUChars() which always resets first).
+ * However, if ucnv_getNextUChar() is called after ucnv_toUnicode()
+ * stopped in the middle of a character sequence (with flush=FALSE),
+ * then ucnv_getNextUChar() will always use the slower ucnv_toUnicode()
+ * internally until the next character boundary.
+ * (This is new in ICU 2.6. In earlier releases, ucnv_getNextUChar() had to
+ * start at a character boundary.)
+ *
+ * Instead of using ucnv_getNextUChar(), it is recommended
+ * to convert using ucnv_toUnicode() or ucnv_toUChars()
+ * and then iterate over the text using U16_NEXT() or a UCharIterator (uiter.h)
+ * or a C++ CharacterIterator or similar.
+ * This allows streaming conversion and offset output, for example.
+ *
+ * Handling of surrogate pairs and supplementary-plane code points:
+ * There are two different kinds of codepages that provide mappings for surrogate characters:
+ *
U_INDEX_OUTOFBOUNDS_ERROR 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 U_BUFFER_OVERFLOW_ERROR 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 ICU 2.0
+ */
+U_STABLE UChar32 U_EXPORT2
+ucnv_getNextUChar(UConverter * converter,
+ const char **source,
+ const char * sourceLimit,
+ UErrorCode * err);
+
+/**
+ * Convert from one external charset to another using two existing UConverters.
+ * Internally, two conversions - ucnv_toUnicode() and ucnv_fromUnicode() -
+ * are used, "pivoting" through 16-bit Unicode.
+ *
+ * There is a similar function, ucnv_convert(),
+ * which has the following limitations:
+ * - it takes charset names, not converter objects, so that
+ * - two converters are opened for each call
+ * - only single-string conversion is possible, not streaming operation
+ * - it does not provide enough information to find out,
+ * in case of failure, whether the toUnicode or
+ * the fromUnicode conversion failed
+ *
+ * By contrast, ucnv_convertEx()
+ * - takes UConverter parameters instead of charset names
+ * - fully exposes the pivot buffer for complete error handling
+ *
+ * ucnv_convertEx() also provides further convenience:
+ * - an option to reset the converters at the beginning
+ * (if reset==TRUE, see parameters;
+ * also sets *pivotTarget=*pivotSource=pivotStart)
+ * - allow NUL-terminated input
+ * (only a single NUL byte, will not work for charsets with multi-byte NULs)
+ * (if sourceLimit==NULL, see parameters)
+ * - terminate with a NUL on output
+ * (only a single NUL byte, not useful for charsets with multi-byte NULs),
+ * or set U_STRING_NOT_TERMINATED_WARNING if the output exactly fills
+ * the target buffer
+ * - the pivot buffer can be provided internally;
+ * in this case, the caller will not be able to get details about where an
+ * error occurred
+ * (if pivotStart==NULL, see below)
+ *
+ * The function returns when one of the following is true:
+ * - the entire source text has been converted successfully to the target buffer
+ * - a target buffer overflow occurred (U_BUFFER_OVERFLOW_ERROR)
+ * - a conversion error occurred
+ * (other U_FAILURE(), see description of pErrorCode)
+ *
+ * Limitation compared to the direct use of
+ * ucnv_fromUnicode() and ucnv_toUnicode():
+ * ucnv_convertEx() does not provide offset information.
+ *
+ * Limitation compared to ucnv_fromUChars() and ucnv_toUChars():
+ * ucnv_convertEx() does not support preflighting directly.
+ *
+ * Sample code for converting a single string from
+ * one external charset to UTF-8, ignoring the location of errors:
+ *
+ * \code
+ * int32_t
+ * myToUTF8(UConverter *cnv,
+ * const char *s, int32_t length,
+ * char *u8, int32_t capacity,
+ * UErrorCode *pErrorCode) {
+ * UConverter *utf8Cnv;
+ * char *target;
+ *
+ * if(U_FAILURE(*pErrorCode)) {
+ * return 0;
+ * }
+ *
+ * utf8Cnv=myGetCachedUTF8Converter(pErrorCode);
+ * if(U_FAILURE(*pErrorCode)) {
+ * return 0;
+ * }
+ *
+ * target=u8;
+ * ucnv_convertEx(cnv, utf8Cnv,
+ * &target, u8+capacity,
+ * &s, length>=0 ? s+length : NULL,
+ * NULL, NULL, NULL, NULL,
+ * TRUE, TRUE,
+ * pErrorCode);
+ *
+ * myReleaseCachedUTF8Converter(utf8Cnv);
+ *
+ * // return the output string length, but without preflighting
+ * return (int32_t)(target-u8);
+ * }
+ * \endcode
+ *
+ * @param targetCnv Output converter, used to convert from the UTF-16 pivot
+ * to the target using ucnv_fromUnicode().
+ * @param sourceCnv Input converter, used to convert from the source to
+ * the UTF-16 pivot using ucnv_toUnicode().
+ * @param target I/O parameter, same as for ucnv_fromUChars().
+ * Input: *target points to the beginning of the target buffer.
+ * Output: *target points to the first unit after the last char written.
+ * @param targetLimit Pointer to the first unit after the target buffer.
+ * @param source I/O parameter, same as for ucnv_toUChars().
+ * Input: *source points to the beginning of the source buffer.
+ * Output: *source points to the first unit after the last char read.
+ * @param sourceLimit Pointer to the first unit after the source buffer.
+ * @param pivotStart Pointer to the UTF-16 pivot buffer. If pivotStart==NULL,
+ * then an internal buffer is used and the other pivot
+ * arguments are ignored and can be NULL as well.
+ * @param pivotSource I/O parameter, same as source in ucnv_fromUChars() for
+ * conversion from the pivot buffer to the target buffer.
+ * @param pivotTarget I/O parameter, same as target in ucnv_toUChars() for
+ * conversion from the source buffer to the pivot buffer.
+ * It must be pivotStart<=*pivotSource<=*pivotTarget<=pivotLimit
+ * and pivotStartucnv_countAliases() string-pointers
+ * (const char *) that will be filled in.
+ * The strings themselves are owned by the library.
+ * @param pErrorCode result of operation
+ * @stable ICU 2.0
+ */
+U_STABLE void U_EXPORT2
+ucnv_getAliases(const char *alias, const char **aliases, UErrorCode *pErrorCode);
+
+/**
+ * Return a new UEnumeration object for enumerating all the
+ * alias names for a given converter that are recognized by a standard.
+ * This method only enumerates the listed entries in the alias file.
+ * The convrtrs.txt file can be modified to change the results of
+ * this function.
+ * The first result in this list is the same result given by
+ * ucnv_getStandardName, which is the default alias for
+ * the specified standard name. The returned object must be closed with
+ * uenum_close when you are done with the object.
+ *
+ * @param convName original converter name
+ * @param standard name of the standard governing the names; MIME and IANA
+ * are such standards
+ * @param pErrorCode The error code
+ * @return A UEnumeration object for getting all aliases that are recognized
+ * by a standard. If any of the parameters are invalid, NULL
+ * is returned.
+ * @see ucnv_getStandardName
+ * @see uenum_close
+ * @see uenum_next
+ * @stable ICU 2.2
+ */
+U_STABLE UEnumeration * U_EXPORT2
+ucnv_openStandardNames(const char *convName,
+ const char *standard,
+ UErrorCode *pErrorCode);
+
+/**
+ * Gives the number of standards associated to converter names.
+ * @return number of standards
+ * @stable ICU 2.0
+ */
+U_STABLE 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 ICU 2.0
+ */
+U_STABLE const char * U_EXPORT2
+ucnv_getStandard(uint16_t n, UErrorCode *pErrorCode);
+
+/**
+ * Returns a standard name for a given converter name.
+ *
+ * Example alias table:
+ * conv alias1 { STANDARD1 } alias2 { STANDARD1* }
+ *
+ * Result of ucnv_getStandardName("conv", "STANDARD1") from example
+ * alias table:
+ * "alias2"
+ *
+ * @param name original converter name
+ * @param standard name of the standard governing the names; MIME and IANA
+ * are such standards
+ * @param pErrorCode result of operation
+ * @return returns the standard converter name;
+ * if a standard converter name cannot be determined,
+ * then NULL is returned. Owned by the library.
+ * @stable ICU 2.0
+ */
+U_STABLE const char * U_EXPORT2
+ucnv_getStandardName(const char *name, const char *standard, UErrorCode *pErrorCode);
+
+/**
+ * This function will return the internal canonical converter name of the
+ * tagged alias. This is the opposite of ucnv_openStandardNames, which
+ * returns the tagged alias given the canonical name.
+ *
+ * Example alias table:
+ * conv alias1 { STANDARD1 } alias2 { STANDARD1* }
+ *
+ * Result of ucnv_getStandardName("alias1", "STANDARD1") from example
+ * alias table:
+ * "conv"
+ *
+ * @return returns the canonical converter name;
+ * if a standard or alias name cannot be determined,
+ * then NULL is returned. The returned string is
+ * owned by the library.
+ * @see ucnv_getStandardName
+ * @stable ICU 2.4
+ */
+U_STABLE const char * U_EXPORT2
+ucnv_getCanonicalName(const char *alias, 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 NULL is returned.
+ * Storage owned by the library
+ * @see ucnv_setDefaultName
+ * @stable ICU 2.0
+ */
+U_STABLE 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 ICU 2.0
+ */
+U_STABLE 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 sourceLen the length of the input buffer
+ * @see ucnv_isAmbiguous
+ * @stable ICU 2.0
+ */
+U_STABLE 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.
+ * @param cnv the converter to be tested
+ * @return TRUE if the converter contains ambiguous mapping of the same
+ * character, FALSE otherwise.
+ * @stable ICU 2.0
+ */
+U_STABLE 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 ICU 2.0
+ */
+U_STABLE void U_EXPORT2
+ucnv_setFallback(UConverter *cnv, UBool usesFallback);
+
+/**
+ * Determines if the converter uses fallback mappings or not.
+ * @param cnv The converter to be tested
+ * @return TRUE if the converter uses fallback, FALSE otherwise.
+ * @stable ICU 2.0
+ */
+U_STABLE UBool U_EXPORT2
+ucnv_usesFallback(const UConverter *cnv);
+
+/**
+ * Detects Unicode signature byte sequences at the start of the byte stream
+ * and returns the charset name of the indicated Unicode charset.
+ * NULL is returned when no Unicode signature is recognized.
+ * The number of bytes in the signature is output as well.
+ *
+ * The caller can ucnv_open() a converter using the charset name.
+ * The first code unit (UChar) from the start of the stream will be U+FEFF
+ * (the Unicode BOM/signature character) and can usually be ignored.
+ *
+ * For most Unicode charsets it is also possible to ignore the indicated
+ * number of initial stream bytes and start converting after them.
+ * However, there are stateful Unicode charsets (UTF-7 and BOCU-1) for which
+ * this will not work. Therefore, it is best to ignore the first output UChar
+ * instead of the input signature bytes.
+ *
+ * Usage: + * @code + * UErrorCode err = U_ZERO_ERROR; + * char input[] = { '\xEF','\xBB', '\xBF','\x41','\x42','\x43' }; + * int32_t signatureLength = 0; + * char *encoding = ucnv_detectUnicodeSignatures(input,sizeof(input),&signatureLength,&err); + * UConverter *conv = NULL; + * UChar output[100]; + * UChar *target = output, *out; + * char *source = input; + * if(encoding!=NULL && U_SUCCESS(err)){ + * // should signature be discarded ? + * conv = ucnv_open(encoding, &err); + * // do the conversion + * ucnv_toUnicode(conv, + * target, output + sizeof(output)/U_SIZEOF_UCHAR, + * source, input + sizeof(input), + * NULL, TRUE, &err); + * out = output; + * if (discardSignature){ + * ++out; // ignore initial U+FEFF + * } + * while(out != target) { + * printf("%04x ", *out++); + * } + * puts(""); + * } + * + * @endcode + * + * @param source The source string in which the signature should be detected. + * @param sourceLength Length of the input string, or -1 if terminated with a NUL byte. + * @param signatureLength A pointer to int32_t to receive the number of bytes that make up the signature + * of the detected UTF. 0 if not detected. + * Can be a NULL pointer. + * @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. + * @stable ICU 2.4 + */ +U_STABLE const char* U_EXPORT2 +ucnv_detectUnicodeSignature(const char* source, + int32_t sourceLength, + int32_t *signatureLength, + UErrorCode *pErrorCode); + +#endif + +#endif +/*_UCNV*/