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Diffstat (limited to 'include/iprt/utf16.h')
| -rw-r--r-- | include/iprt/utf16.h | 1526 |
1 files changed, 1526 insertions, 0 deletions
diff --git a/include/iprt/utf16.h b/include/iprt/utf16.h new file mode 100644 index 00000000..e6d3ac60 --- /dev/null +++ b/include/iprt/utf16.h @@ -0,0 +1,1526 @@ +/** @file + * IPRT - String Manipulation, UTF-16 encoding. + */ + +/* + * Copyright (C) 2006-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + +#ifndef IPRT_INCLUDED_utf16_h +#define IPRT_INCLUDED_utf16_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/string.h> + +RT_C_DECLS_BEGIN + + +/** @defgroup rt_str_utf16 UTF-16 String Manipulation + * @ingroup grp_rt_str + * @{ + */ + +/** + * Allocates memory for UTF-16 string storage (default tag). + * + * You should normally not use this function, except if there is some very + * custom string handling you need doing that isn't covered by any of the other + * APIs. + * + * @returns Pointer to the allocated UTF-16 string. The first wide char is + * always set to the string terminator char, the contents of the + * remainder of the memory is undefined. The string must be freed by + * calling RTUtf16Free. + * + * NULL is returned if the allocation failed. Please translate this to + * VERR_NO_UTF16_MEMORY and not VERR_NO_MEMORY. Also consider + * RTUtf16AllocEx if an IPRT status code is required. + * + * @param cb How many bytes to allocate, will be rounded up + * to a multiple of two. If this is zero, we will + * allocate a terminator wide char anyway. + */ +#define RTUtf16Alloc(cb) RTUtf16AllocTag((cb), RTSTR_TAG) + +/** + * Allocates memory for UTF-16 string storage (custom tag). + * + * You should normally not use this function, except if there is some very + * custom string handling you need doing that isn't covered by any of the other + * APIs. + * + * @returns Pointer to the allocated UTF-16 string. The first wide char is + * always set to the string terminator char, the contents of the + * remainder of the memory is undefined. The string must be freed by + * calling RTUtf16Free. + * + * NULL is returned if the allocation failed. Please translate this to + * VERR_NO_UTF16_MEMORY and not VERR_NO_MEMORY. Also consider + * RTUtf16AllocExTag if an IPRT status code is required. + * + * @param cb How many bytes to allocate, will be rounded up + * to a multiple of two. If this is zero, we will + * allocate a terminator wide char anyway. + * @param pszTag Allocation tag used for statistics and such. + */ +RTDECL(PRTUTF16) RTUtf16AllocTag(size_t cb, const char *pszTag); + +/** + * Reallocates the specified UTF-16 string (default tag). + * + * You should normally not use this function, except if there is some very + * custom string handling you need doing that isn't covered by any of the other + * APIs. + * + * @returns VINF_SUCCESS. + * @retval VERR_NO_UTF16_MEMORY if we failed to reallocate the string, @a + * *ppwsz remains unchanged. + * + * @param ppwsz Pointer to the string variable containing the + * input and output string. + * + * When not freeing the string, the result will + * always have the last RTUTF16 set to the + * terminator character so that when used for + * string truncation the result will be a valid + * C-style string (your job to keep it a valid + * UTF-16 string). + * + * When the input string is NULL and we're supposed + * to reallocate, the returned string will also + * have the first RTUTF16 set to the terminator + * char so it will be a valid C-style string. + * + * @param cbNew When @a cbNew is zero, we'll behave like + * RTUtf16Free and @a *ppwsz will be set to NULL. + * + * When not zero, this will be rounded up to a + * multiple of two, and used as the new size of the + * memory backing the string, i.e. it includes the + * terminator (RTUTF16) char. + */ +#define RTUtf16Realloc(ppwsz, cbNew) RTUtf16ReallocTag((ppwsz), (cbNew), RTSTR_TAG) + +/** + * Reallocates the specified UTF-16 string (custom tag). + * + * You should normally not use this function, except if there is some very + * custom string handling you need doing that isn't covered by any of the other + * APIs. + * + * @returns VINF_SUCCESS. + * @retval VERR_NO_UTF16_MEMORY if we failed to reallocate the string, @a + * *ppwsz remains unchanged. + * + * @param ppwsz Pointer to the string variable containing the + * input and output string. + * + * When not freeing the string, the result will + * always have the last RTUTF16 set to the + * terminator character so that when used for + * string truncation the result will be a valid + * C-style string (your job to keep it a valid + * UTF-16 string). + * + * When the input string is NULL and we're supposed + * to reallocate, the returned string will also + * have the first RTUTF16 set to the terminator + * char so it will be a valid C-style string. + * + * @param cbNew When @a cbNew is zero, we'll behave like + * RTUtf16Free and @a *ppwsz will be set to NULL. + * + * When not zero, this will be rounded up to a + * multiple of two, and used as the new size of the + * memory backing the string, i.e. it includes the + * terminator (RTUTF16) char. + * @param pszTag Allocation tag used for statistics and such. + */ +RTDECL(int) RTUtf16ReallocTag(PRTUTF16 *ppwsz, size_t cbNew, const char *pszTag); + +/** + * Free a UTF-16 string allocated by RTStrToUtf16(), RTStrToUtf16Ex(), + * RTLatin1ToUtf16(), RTLatin1ToUtf16Ex(), RTUtf16Dup() or RTUtf16DupEx(). + * + * @param pwszString The UTF-16 string to free. NULL is accepted. + */ +RTDECL(void) RTUtf16Free(PRTUTF16 pwszString); + +/** + * Allocates a new copy of the specified UTF-16 string (default tag). + * + * @returns Pointer to the allocated string copy. Use RTUtf16Free() to free it. + * @returns NULL when out of memory. + * @param pwszString UTF-16 string to duplicate. + * @remark This function will not make any attempt to validate the encoding. + */ +#define RTUtf16Dup(pwszString) RTUtf16DupTag((pwszString), RTSTR_TAG) + +/** + * Allocates a new copy of the specified UTF-16 string (custom tag). + * + * @returns Pointer to the allocated string copy. Use RTUtf16Free() to free it. + * @returns NULL when out of memory. + * @param pwszString UTF-16 string to duplicate. + * @param pszTag Allocation tag used for statistics and such. + * @remark This function will not make any attempt to validate the encoding. + */ +RTDECL(PRTUTF16) RTUtf16DupTag(PCRTUTF16 pwszString, const char *pszTag); + +/** + * Allocates a new copy of the specified UTF-16 string (default tag). + * + * @returns iprt status code. + * @param ppwszString Receives pointer of the allocated UTF-16 string. + * The returned pointer must be freed using RTUtf16Free(). + * @param pwszString UTF-16 string to duplicate. + * @param cwcExtra Number of extra RTUTF16 items to allocate. + * @remark This function will not make any attempt to validate the encoding. + */ +#define RTUtf16DupEx(ppwszString, pwszString, cwcExtra) \ + RTUtf16DupExTag((ppwszString), (pwszString), (cwcExtra), RTSTR_TAG) + +/** + * Allocates a new copy of the specified UTF-16 string (custom tag). + * + * @returns iprt status code. + * @param ppwszString Receives pointer of the allocated UTF-16 string. + * The returned pointer must be freed using RTUtf16Free(). + * @param pwszString UTF-16 string to duplicate. + * @param cwcExtra Number of extra RTUTF16 items to allocate. + * @param pszTag Allocation tag used for statistics and such. + * @remark This function will not make any attempt to validate the encoding. + */ +RTDECL(int) RTUtf16DupExTag(PRTUTF16 *ppwszString, PCRTUTF16 pwszString, size_t cwcExtra, const char *pszTag); + +/** + * Returns the length of a UTF-16 string in UTF-16 characters + * without trailing '\\0'. + * + * Surrogate pairs counts as two UTF-16 characters here. Use RTUtf16CpCnt() + * to get the exact number of code points in the string. + * + * @returns The number of RTUTF16 items in the string. + * @param pwszString Pointer the UTF-16 string. + * @remark This function will not make any attempt to validate the encoding. + */ +RTDECL(size_t) RTUtf16Len(PCRTUTF16 pwszString); + +/** + * Find the length of a zero-terminated byte string, given a max string length. + * + * @returns The string length or cbMax. The returned length does not include + * the zero terminator if it was found. + * + * @param pwszString The string. + * @param cwcMax The max string length in RTUTF16s. + * @sa RTUtf16NLenEx, RTStrNLen. + */ +RTDECL(size_t) RTUtf16NLen(PCRTUTF16 pwszString, size_t cwcMax); + +/** + * Find the length of a zero-terminated byte string, given + * a max string length. + * + * @returns IPRT status code. + * @retval VINF_SUCCESS if the string has a length less than cchMax. + * @retval VERR_BUFFER_OVERFLOW if the end of the string wasn't found + * before cwcMax was reached. + * + * @param pwszString The string. + * @param cwcMax The max string length in RTUTF16s. + * @param pcwc Where to store the string length excluding the + * terminator. This is set to cwcMax if the terminator + * isn't found. + * @sa RTUtf16NLen, RTStrNLenEx. + */ +RTDECL(int) RTUtf16NLenEx(PCRTUTF16 pwszString, size_t cwcMax, size_t *pcwc); + +/** + * Find the zero terminator in a string with a limited length. + * + * @returns Pointer to the zero terminator. + * @returns NULL if the zero terminator was not found. + * + * @param pwszString The string. + * @param cwcMax The max string length. RTSTR_MAX is fine. + */ +RTDECL(PCRTUTF16) RTUtf16End(PCRTUTF16 pwszString, size_t cwcMax); + +/** + * Finds a give UTF-16 character in a UTF-16 string. + * + * @returns Pointer to the first occurence of @a wc. + * @returns NULL if @a wc was not found. + * + * @param pwszString The string to search. + * @param wc The UTF-16 character to search for. + */ +RTDECL(PRTUTF16) RTUtf16Chr(PCRTUTF16 pwszString, RTUTF16 wc); + +/** + * Strips blankspaces from both ends of the string. + * + * @returns Pointer to first non-blank char in the string. + * @param pwsz The string to strip. + */ +RTDECL(PRTUTF16) RTUtf16Strip(PRTUTF16 pwsz); + +/** + * Strips blankspaces from the start of the string. + * + * @returns Pointer to first non-blank char in the string. + * @param pwsz The string to strip. + */ +RTDECL(PRTUTF16) RTUtf16StripL(PCRTUTF16 pwsz); + +/** + * Strips blankspaces from the end of the string. + * + * @returns pwsz. + * @param pwsz The string to strip. + */ +RTDECL(PRTUTF16) RTUtf16StripR(PRTUTF16 pwsz); + +/** + * String copy with overflow handling. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_BUFFER_OVERFLOW if the destination buffer is too small. The + * buffer will contain as much of the string as it can hold, fully + * terminated. + * + * @param pwszDst The destination buffer. + * @param cwcDst The size of the destination buffer in RTUTF16s. + * @param pwszSrc The source string. NULL is not OK. + */ +RTDECL(int) RTUtf16Copy(PRTUTF16 pwszDst, size_t cwcDst, PCRTUTF16 pwszSrc); + +/** + * String copy with overflow handling, ASCII source. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_BUFFER_OVERFLOW if the destination buffer is too small. The + * buffer will contain as much of the string as it can hold, fully + * terminated. + * + * @param pwszDst The destination buffer. + * @param cwcDst The size of the destination buffer in RTUTF16s. + * @param pszSrc The source string, pure ASCII. NULL is not OK. + */ +RTDECL(int) RTUtf16CopyAscii(PRTUTF16 pwszDst, size_t cwcDst, const char *pszSrc); + +/** + * String copy with overflow handling. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_BUFFER_OVERFLOW if the destination buffer is too small. The + * buffer will contain as much of the string as it can hold, fully + * terminated. + * + * @param pwszDst The destination buffer. + * @param cwcDst The size of the destination buffer in RTUTF16s. + * @param pwszSrc The source string. NULL is not OK. + * @param cwcSrcMax The maximum number of chars (not code points) to + * copy from the source string, not counting the + * terminator as usual. + */ +RTDECL(int) RTUtf16CopyEx(PRTUTF16 pwszDst, size_t cwcDst, PCRTUTF16 pwszSrc, size_t cwcSrcMax); + +/** + * String concatenation with overflow handling. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_BUFFER_OVERFLOW if the destination buffer is too small. The + * buffer will contain as much of the string as it can hold, fully + * terminated. + * + * @param pwszDst The destination buffer. + * @param cwcDst The size of the destination buffer in RTUTF16s. + * @param pwszSrc The source string. NULL is not OK. + */ +RTDECL(int) RTUtf16Cat(PRTUTF16 pwszDst, size_t cwcDst, PCRTUTF16 pwszSrc); + +/** + * String concatenation with overflow handling, ASCII source. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_BUFFER_OVERFLOW if the destination buffer is too small. The + * buffer will contain as much of the string as it can hold, fully + * terminated. + * + * @param pwszDst The destination buffer. + * @param cwcDst The size of the destination buffer in RTUTF16s. + * @param pszSrc The source string, pure ASCII. NULL is not OK. + */ +RTDECL(int) RTUtf16CatAscii(PRTUTF16 pwszDst, size_t cwcDst, const char *pszSrc); + +/** + * String concatenation with overflow handling. + * + * @retval VINF_SUCCESS on success. + * @retval VERR_BUFFER_OVERFLOW if the destination buffer is too small. The + * buffer will contain as much of the string as it can hold, fully + * terminated. + * + * @param pwszDst The destination buffer. + * @param cwcDst The size of the destination buffer in RTUTF16s. + * @param pwszSrc The source string. NULL is not OK. + * @param cwcSrcMax The maximum number of UTF-16 chars (not code + * points) to copy from the source string, not + * counting the terminator as usual. + */ +RTDECL(int) RTUtf16CatEx(PRTUTF16 pwszDst, size_t cwcDst, PCRTUTF16 pwszSrc, size_t cwcSrcMax); + +/** + * Performs a case sensitive string compare between two UTF-16 strings. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First UTF-16 string. Null is allowed. + * @param pwsz2 Second UTF-16 string. Null is allowed. + * @remark This function will not make any attempt to validate the encoding. + */ +RTDECL(int) RTUtf16Cmp(PCRTUTF16 pwsz1, PCRTUTF16 pwsz2); + +/** + * Performs a case sensitive string compare between an UTF-16 string and a pure + * ASCII string. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First UTF-16 string. Null is allowed. + * @param psz2 Second string, pure ASCII. Null is allowed. + * @remark This function will not make any attempt to validate the encoding. + */ +RTDECL(int) RTUtf16CmpAscii(PCRTUTF16 pwsz1, const char *psz2); + +/** + * Performs a case sensitive string compare between an UTF-16 string and a UTF-8 + * string. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First UTF-16 string. Null is allowed. + * @param psz2 Second string, UTF-8. Null is allowed. + * @remarks NULL and empty strings are treated equally. + */ +RTDECL(int) RTUtf16CmpUtf8(PCRTUTF16 pwsz1, const char *psz2); + + +/** + * Performs a case sensitive and length limited string compare between two UTF-16 strings. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First UTF-16 string. Null is allowed. + * @param pwsz2 Second UTF-16 string. Null is allowed. + * @param cwcMax Maximum number of characters (RTUTF16) from the first + * @remark This function will not make any attempt to validate the encoding. + */ +RTDECL(int) RTUtf16NCmp(PCRTUTF16 pwsz1, PCRTUTF16 pwsz2, size_t cwcMax); + +/** + * Performs a case sensitive and length limited string compare between an UTF-16 + * string and a pure ASCII string. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First UTF-16 string. Null is allowed. + * @param psz2 Second string, pure ASCII. Null is allowed. + * @param cwcMax Maximum number of characters (RTUTF16) to compare. + * @remark This function will not make any attempt to validate the encoding. + */ +RTDECL(int) RTUtf16NCmpAscii(PCRTUTF16 pwsz1, const char *psz2, size_t cwcMax); + +/** + * Performs a case sensitive and length limited string compare between an UTF-16 + * string and a UTF-8 string. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First UTF-16 string. Null is allowed. + * @param psz2 Second string, UTF-8. Null is allowed. + * @param cwcMax1 Maximum number of UTF-16 characters (RTUTF16) from the + * first string to compare. + * @param cchMax2 Maximum number of UTF-8 characters (char) from the + * second string to compare. + * @remarks NULL and empty strings are treated equally. + */ +RTDECL(int) RTUtf16NCmpUtf8(PCRTUTF16 pwsz1, const char *psz2, size_t cwcMax1, size_t cchMax2); + + +/** + * Performs a case insensitive string compare between two UTF-16 strings. + * + * This is a simplified compare, as only the simplified lower/upper case folding + * specified by the unicode specs are used. It does not consider character pairs + * as they are used in some languages, just simple upper & lower case compares. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First UTF-16 string. Null is allowed. + * @param pwsz2 Second UTF-16 string. Null is allowed. + */ +RTDECL(int) RTUtf16ICmp(PCRTUTF16 pwsz1, PCRTUTF16 pwsz2); + +/** + * Performs a case insensitive string compare between two big endian UTF-16 + * strings. + * + * This is a simplified compare, as only the simplified lower/upper case folding + * specified by the unicode specs are used. It does not consider character pairs + * as they are used in some languages, just simple upper & lower case compares. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First big endian UTF-16 string. Null is allowed. + * @param pwsz2 Second big endian UTF-16 string. Null is allowed. + */ +RTDECL(int) RTUtf16BigICmp(PCRTUTF16 pwsz1, PCRTUTF16 pwsz2); + +/** + * Performs a case insensitive string compare between an UTF-16 string and a + * UTF-8 string. + * + * @returns < 0 if the first string less than the second string.s + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First UTF-16 string. Null is allowed. + * @param psz2 Second string, UTF-8. Null is allowed. + * @remarks NULL and empty strings are treated equally. + */ +RTDECL(int) RTUtf16ICmpUtf8(PCRTUTF16 pwsz1, const char *psz2); + +/** + * Performs a case insensitive string compare between an UTF-16 string and a + * pure ASCII string. + * + * Since this compare only takes cares about the first 128 codepoints in + * unicode, no tables are needed and there aren't any real complications. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First UTF-16 string. Null is allowed. + * @param psz2 Second string, pure ASCII. Null is allowed. + */ +RTDECL(int) RTUtf16ICmpAscii(PCRTUTF16 pwsz1, const char *psz2); + +/** + * Performs a case insensitive string compare between two UTF-16 strings + * using the current locale of the process (if applicable). + * + * This differs from RTUtf16ICmp() in that it will try, if a locale with the + * required data is available, to do a correct case-insensitive compare. It + * follows that it is more complex and thereby likely to be more expensive. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First UTF-16 string. Null is allowed. + * @param pwsz2 Second UTF-16 string. Null is allowed. + */ +RTDECL(int) RTUtf16LocaleICmp(PCRTUTF16 pwsz1, PCRTUTF16 pwsz2); + +/** + * Performs a case insensitive string compare between two UTF-16 strings, + * stopping after N characters. + * + * This is a simplified compare, as only the simplified lower/upper case folding + * specified by the unicode specs are used. It does not consider character pairs + * as they are used in some languages, just simple upper & lower case compares. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First UTF-16 string. Null is allowed. + * @param pwsz2 Second UTF-16 string. Null is allowed. + * @param cwcMax Maximum number of characters to compare. + */ +RTDECL(int) RTUtf16NICmp(PCRTUTF16 pwsz1, PCRTUTF16 pwsz2, size_t cwcMax); + +/** + * Performs a case insensitive string compare between two big endian UTF-16 + * strings, stopping after N characters. + * + * This is a simplified compare, as only the simplified lower/upper case folding + * specified by the unicode specs are used. It does not consider character pairs + * as they are used in some languages, just simple upper & lower case compares. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 First big endian UTF-16 string. Null is allowed. + * @param pwsz2 Second big endian UTF-16 string. Null is allowed. + * @param cwcMax Maximum number of characters to compare. + */ +RTDECL(int) RTUtf16BigNICmp(PCRTUTF16 pwsz1, PCRTUTF16 pwsz2, size_t cwcMax); + +/** + * Performs a case insensitive string compare between a UTF-16 string and a pure + * ASCII string, stopping after N characters. + * + * Since this compare only takes cares about the first 128 codepoints in + * unicode, no tables are needed and there aren't any real complications. + * + * @returns < 0 if the first string less than the second string. + * @returns 0 if the first string identical to the second string. + * @returns > 0 if the first string greater than the second string. + * @param pwsz1 The UTF-16 first string. Null is allowed. + * @param psz2 The pure ASCII second string. Null is allowed. + * @param cwcMax Maximum number of UTF-16 characters to compare. + */ +RTDECL(int) RTUtf16NICmpAscii(PCRTUTF16 pwsz1, const char *psz2, size_t cwcMax); + + +/** + * Locates a substring, ascii version. + * + * @returns Offset into @a pwszString of the substring if found, -1 if not. + * @param pwszString The UTF-16 to search. NULL is allowed (no match). + * @param pszSubStr The pure ASCII substring to locate. NULL is allowed (not + * matching anything, just like an empty string). + */ +RTDECL(ssize_t) RTUtf16FindAscii(PCRTUTF16 pwszString, const char *pszSubStr); + + +/** + * Folds a UTF-16 string to lowercase. + * + * This is a very simple folding; is uses the simple lowercase + * code point, it is not related to any locale just the most common + * lowercase codepoint setup by the unicode specs, and it will not + * create new surrogate pairs or remove existing ones. + * + * @returns Pointer to the passed in string. + * @param pwsz The string to fold. + */ +RTDECL(PRTUTF16) RTUtf16ToLower(PRTUTF16 pwsz); + +/** + * Folds a UTF-16 string to uppercase. + * + * This is a very simple folding; is uses the simple uppercase + * code point, it is not related to any locale just the most common + * uppercase codepoint setup by the unicode specs, and it will not + * create new surrogate pairs or remove existing ones. + * + * @returns Pointer to the passed in string. + * @param pwsz The string to fold. + */ +RTDECL(PRTUTF16) RTUtf16ToUpper(PRTUTF16 pwsz); + +/** + * Validates the UTF-16 encoding of the string. + * + * @returns iprt status code. + * @param pwsz The string. + */ +RTDECL(int) RTUtf16ValidateEncoding(PCRTUTF16 pwsz); + +/** + * Validates the UTF-16 encoding of the string. + * + * @returns iprt status code. + * @param pwsz The string. + * @param cwc The max string length (/ size) in UTF-16 units. Use + * RTSTR_MAX to process the entire string. + * @param fFlags Combination of RTSTR_VALIDATE_ENCODING_XXX flags. + */ +RTDECL(int) RTUtf16ValidateEncodingEx(PCRTUTF16 pwsz, size_t cwc, uint32_t fFlags); + +/** + * Checks if the UTF-16 encoding is valid. + * + * @returns true / false. + * @param pwsz The string. + */ +RTDECL(bool) RTUtf16IsValidEncoding(PCRTUTF16 pwsz); + +/** + * Sanitise a (valid) UTF-16 string by replacing all characters outside a white + * list in-place by an ASCII replacement character. + * + * Surrogate paris will be replaced by two chars. + * + * @returns The number of code points replaced. In the case of an incorrectly + * encoded string -1 will be returned, and the string is not completely + * processed. In the case of puszValidPairs having an odd number of + * code points, -1 will be also return but without any modification to + * the string. + * @param pwsz The string to sanitise. + * @param puszValidPairs A zero-terminated array of pairs of Unicode points. + * Each pair is the start and end point of a range, + * and the union of these ranges forms the white list. + * @param chReplacement The ASCII replacement character. + * @sa RTStrPurgeComplementSet + */ +RTDECL(ssize_t) RTUtf16PurgeComplementSet(PRTUTF16 pwsz, PCRTUNICP puszValidPairs, char chReplacement); + + +/** + * Translate a UTF-16 string into a UTF-8 allocating the result buffer (default + * tag). + * + * @returns iprt status code. + * @param pwszString UTF-16 string to convert. + * @param ppszString Receives pointer of allocated UTF-8 string on + * success, and is always set to NULL on failure. + * The returned pointer must be freed using RTStrFree(). + */ +#define RTUtf16ToUtf8(pwszString, ppszString) RTUtf16ToUtf8Tag((pwszString), (ppszString), RTSTR_TAG) + +/** + * Translate a UTF-16 string into a UTF-8 allocating the result buffer. + * + * @returns iprt status code. + * @param pwszString UTF-16 string to convert. + * @param ppszString Receives pointer of allocated UTF-8 string on + * success, and is always set to NULL on failure. + * The returned pointer must be freed using RTStrFree(). + * @param pszTag Allocation tag used for statistics and such. + */ +RTDECL(int) RTUtf16ToUtf8Tag(PCRTUTF16 pwszString, char **ppszString, const char *pszTag); + +/** + * Translate a UTF-16BE string into a UTF-8 allocating the result buffer + * (default tag). + * + * This differs from RTUtf16ToUtf8 in that the input is always a + * big-endian string. + * + * @returns iprt status code. + * @param pwszString UTF-16BE string to convert. + * @param ppszString Receives pointer of allocated UTF-8 string on + * success, and is always set to NULL on failure. + * The returned pointer must be freed using RTStrFree(). + */ +#define RTUtf16BigToUtf8(pwszString, ppszString) RTUtf16BigToUtf8Tag((pwszString), (ppszString), RTSTR_TAG) + +/** + * Translate a UTF-16BE string into a UTF-8 allocating the result buffer. + * + * This differs from RTUtf16ToUtf8Tag in that the input is always a + * big-endian string. + * + * @returns iprt status code. + * @param pwszString UTF-16BE string to convert. + * @param ppszString Receives pointer of allocated UTF-8 string on + * success, and is always set to NULL on failure. + * The returned pointer must be freed using RTStrFree(). + * @param pszTag Allocation tag used for statistics and such. + */ +RTDECL(int) RTUtf16BigToUtf8Tag(PCRTUTF16 pwszString, char **ppszString, const char *pszTag); + +/** + * Translate a UTF-16LE string into a UTF-8 allocating the result buffer + * (default tag). + * + * This differs from RTUtf16ToUtf8 in that the input is always a + * little-endian string. + * + * @returns iprt status code. + * @param pwszString UTF-16LE string to convert. + * @param ppszString Receives pointer of allocated UTF-8 string on + * success, and is always set to NULL on failure. + * The returned pointer must be freed using RTStrFree(). + */ +#define RTUtf16LittleToUtf8(pwszString, ppszString) RTUtf16LittleToUtf8Tag((pwszString), (ppszString), RTSTR_TAG) + +/** + * Translate a UTF-16LE string into a UTF-8 allocating the result buffer. + * + * This differs from RTUtf16ToUtf8Tag in that the input is always a + * little-endian string. + * + * @returns iprt status code. + * @param pwszString UTF-16LE string to convert. + * @param ppszString Receives pointer of allocated UTF-8 string on + * success, and is always set to NULL on failure. + * The returned pointer must be freed using RTStrFree(). + * @param pszTag Allocation tag used for statistics and such. + */ +RTDECL(int) RTUtf16LittleToUtf8Tag(PCRTUTF16 pwszString, char **ppszString, const char *pszTag); + + +/** + * Translates UTF-16 to UTF-8 using buffer provided by the caller or a fittingly + * sized buffer allocated by the function (default tag). + * + * @returns iprt status code. + * @param pwszString The UTF-16 string to convert. + * @param cwcString The number of RTUTF16 items to translate from pwszString. + * The translation will stop when reaching cwcString or the terminator ('\\0'). + * Use RTSTR_MAX to translate the entire string. + * @param ppsz If cch is non-zero, this must either be pointing to a pointer to + * a buffer of the specified size, or pointer to a NULL pointer. + * If *ppsz is NULL or cch is zero a buffer of at least cch chars + * will be allocated to hold the translated string. + * If a buffer was requested it must be freed using RTStrFree(). + * @param cch The buffer size in chars (the type). This includes the terminator. + * @param pcch Where to store the length of the translated string, + * excluding the terminator. (Optional) + * + * This may be set under some error conditions, + * however, only for VERR_BUFFER_OVERFLOW and + * VERR_NO_STR_MEMORY will it contain a valid string + * length that can be used to resize the buffer. + */ +#define RTUtf16ToUtf8Ex(pwszString, cwcString, ppsz, cch, pcch) \ + RTUtf16ToUtf8ExTag((pwszString), (cwcString), (ppsz), (cch), (pcch), RTSTR_TAG) + +/** + * Translates UTF-16 to UTF-8 using buffer provided by the caller or a fittingly + * sized buffer allocated by the function (custom tag). + * + * @returns iprt status code. + * @param pwszString The UTF-16 string to convert. + * @param cwcString The number of RTUTF16 items to translate from pwszString. + * The translation will stop when reaching cwcString or the terminator ('\\0'). + * Use RTSTR_MAX to translate the entire string. + * @param ppsz If cch is non-zero, this must either be pointing to a pointer to + * a buffer of the specified size, or pointer to a NULL pointer. + * If *ppsz is NULL or cch is zero a buffer of at least cch chars + * will be allocated to hold the translated string. + * If a buffer was requested it must be freed using RTStrFree(). + * @param cch The buffer size in chars (the type). This includes the terminator. + * @param pcch Where to store the length of the translated string, + * excluding the terminator. (Optional) + * + * This may be set under some error conditions, + * however, only for VERR_BUFFER_OVERFLOW and + * VERR_NO_STR_MEMORY will it contain a valid string + * length that can be used to resize the buffer. + * @param pszTag Allocation tag used for statistics and such. + */ +RTDECL(int) RTUtf16ToUtf8ExTag(PCRTUTF16 pwszString, size_t cwcString, char **ppsz, size_t cch, size_t *pcch, const char *pszTag); + +/** + * Translates UTF-16BE to UTF-8 using buffer provided by the caller or a + * fittingly sized buffer allocated by the function (default tag). + * + * This differs from RTUtf16ToUtf8Ex in that the input is always a + * big-endian string. + * + * @returns iprt status code. + * @param pwszString The UTF-16BE string to convert. + * @param cwcString The number of RTUTF16 items to translate from pwszString. + * The translation will stop when reaching cwcString or the terminator ('\\0'). + * Use RTSTR_MAX to translate the entire string. + * @param ppsz If cch is non-zero, this must either be pointing to a pointer to + * a buffer of the specified size, or pointer to a NULL pointer. + * If *ppsz is NULL or cch is zero a buffer of at least cch chars + * will be allocated to hold the translated string. + * If a buffer was requested it must be freed using RTStrFree(). + * @param cch The buffer size in chars (the type). This includes the terminator. + * @param pcch Where to store the length of the translated string, + * excluding the terminator. (Optional) + * + * This may be set under some error conditions, + * however, only for VERR_BUFFER_OVERFLOW and + * VERR_NO_STR_MEMORY will it contain a valid string + * length that can be used to resize the buffer. + */ +#define RTUtf16BigToUtf8Ex(pwszString, cwcString, ppsz, cch, pcch) \ + RTUtf16BigToUtf8ExTag((pwszString), (cwcString), (ppsz), (cch), (pcch), RTSTR_TAG) + +/** + * Translates UTF-16BE to UTF-8 using buffer provided by the caller or a + * fittingly sized buffer allocated by the function (custom tag). + * + * This differs from RTUtf16ToUtf8ExTag in that the input is always a + * big-endian string. + * + * @returns iprt status code. + * @param pwszString The UTF-16BE string to convert. + * @param cwcString The number of RTUTF16 items to translate from pwszString. + * The translation will stop when reaching cwcString or the terminator ('\\0'). + * Use RTSTR_MAX to translate the entire string. + * @param ppsz If cch is non-zero, this must either be pointing to a pointer to + * a buffer of the specified size, or pointer to a NULL pointer. + * If *ppsz is NULL or cch is zero a buffer of at least cch chars + * will be allocated to hold the translated string. + * If a buffer was requested it must be freed using RTStrFree(). + * @param cch The buffer size in chars (the type). This includes the terminator. + * @param pcch Where to store the length of the translated string, + * excluding the terminator. (Optional) + * + * This may be set under some error conditions, + * however, only for VERR_BUFFER_OVERFLOW and + * VERR_NO_STR_MEMORY will it contain a valid string + * length that can be used to resize the buffer. + * @param pszTag Allocation tag used for statistics and such. + */ +RTDECL(int) RTUtf16BigToUtf8ExTag(PCRTUTF16 pwszString, size_t cwcString, char **ppsz, size_t cch, size_t *pcch, const char *pszTag); + +/** + * Translates UTF-16LE to UTF-8 using buffer provided by the caller or a + * fittingly sized buffer allocated by the function (default tag). + * + * This differs from RTUtf16ToUtf8Ex in that the input is always a + * little-endian string. + * + * @returns iprt status code. + * @param pwszString The UTF-16LE string to convert. + * @param cwcString The number of RTUTF16 items to translate from pwszString. + * The translation will stop when reaching cwcString or the terminator ('\\0'). + * Use RTSTR_MAX to translate the entire string. + * @param ppsz If cch is non-zero, this must either be pointing to a pointer to + * a buffer of the specified size, or pointer to a NULL pointer. + * If *ppsz is NULL or cch is zero a buffer of at least cch chars + * will be allocated to hold the translated string. + * If a buffer was requested it must be freed using RTStrFree(). + * @param cch The buffer size in chars (the type). This includes the terminator. + * @param pcch Where to store the length of the translated string, + * excluding the terminator. (Optional) + * + * This may be set under some error conditions, + * however, only for VERR_BUFFER_OVERFLOW and + * VERR_NO_STR_MEMORY will it contain a valid string + * length that can be used to resize the buffer. + */ +#define RTUtf16LittleToUtf8Ex(pwszString, cwcString, ppsz, cch, pcch) \ + RTUtf16LittleToUtf8ExTag((pwszString), (cwcString), (ppsz), (cch), (pcch), RTSTR_TAG) + +/** + * Translates UTF-16LE to UTF-8 using buffer provided by the caller or a + * fittingly sized buffer allocated by the function (custom tag). + * + * This differs from RTUtf16ToUtf8ExTag in that the input is always a + * little-endian string. + * + * @returns iprt status code. + * @param pwszString The UTF-16LE string to convert. + * @param cwcString The number of RTUTF16 items to translate from pwszString. + * The translation will stop when reaching cwcString or the terminator ('\\0'). + * Use RTSTR_MAX to translate the entire string. + * @param ppsz If cch is non-zero, this must either be pointing to a pointer to + * a buffer of the specified size, or pointer to a NULL pointer. + * If *ppsz is NULL or cch is zero a buffer of at least cch chars + * will be allocated to hold the translated string. + * If a buffer was requested it must be freed using RTStrFree(). + * @param cch The buffer size in chars (the type). This includes the terminator. + * @param pcch Where to store the length of the translated string, + * excluding the terminator. (Optional) + * + * This may be set under some error conditions, + * however, only for VERR_BUFFER_OVERFLOW and + * VERR_NO_STR_MEMORY will it contain a valid string + * length that can be used to resize the buffer. + * @param pszTag Allocation tag used for statistics and such. + */ +RTDECL(int) RTUtf16LittleToUtf8ExTag(PCRTUTF16 pwszString, size_t cwcString, char **ppsz, size_t cch, size_t *pcch, + const char *pszTag); + +/** + * Calculates the length of the UTF-16 string in UTF-8 chars (bytes). + * + * This function will validate the string, and incorrectly encoded UTF-16 + * strings will be rejected. The primary purpose of this function is to + * help allocate buffers for RTUtf16ToUtf8() of the correct size. For most + * other purposes RTUtf16ToUtf8Ex() should be used. + * + * @returns Number of char (bytes). + * @returns 0 if the string was incorrectly encoded. + * @param pwsz The UTF-16 string. + */ +RTDECL(size_t) RTUtf16CalcUtf8Len(PCRTUTF16 pwsz); + +/** + * Calculates the length of the UTF-16BE string in UTF-8 chars (bytes). + * + * This function will validate the string, and incorrectly encoded UTF-16BE + * strings will be rejected. The primary purpose of this function is to + * help allocate buffers for RTUtf16BigToUtf8() of the correct size. For most + * other purposes RTUtf16BigToUtf8Ex() should be used. + * + * @returns Number of char (bytes). + * @returns 0 if the string was incorrectly encoded. + * @param pwsz The UTF-16BE string. + */ +RTDECL(size_t) RTUtf16BigCalcUtf8Len(PCRTUTF16 pwsz); + +/** + * Calculates the length of the UTF-16LE string in UTF-8 chars (bytes). + * + * This function will validate the string, and incorrectly encoded UTF-16LE + * strings will be rejected. The primary purpose of this function is to + * help allocate buffers for RTUtf16LittleToUtf8() of the correct size. For + * most other purposes RTUtf16LittleToUtf8Ex() should be used. + * + * @returns Number of char (bytes). + * @returns 0 if the string was incorrectly encoded. + * @param pwsz The UTF-16LE string. + */ +RTDECL(size_t) RTUtf16LittleCalcUtf8Len(PCRTUTF16 pwsz); + +/** + * Calculates the length of the UTF-16 string in UTF-8 chars (bytes). + * + * This function will validate the string, and incorrectly encoded UTF-16 + * strings will be rejected. + * + * @returns iprt status code. + * @param pwsz The string. + * @param cwc The max string length. Use RTSTR_MAX to process the entire string. + * @param pcch Where to store the string length (in bytes). Optional. + * This is undefined on failure. + */ +RTDECL(int) RTUtf16CalcUtf8LenEx(PCRTUTF16 pwsz, size_t cwc, size_t *pcch); + +/** + * Calculates the length of the UTF-16BE string in UTF-8 chars (bytes). + * + * This function will validate the string, and incorrectly encoded UTF-16BE + * strings will be rejected. + * + * @returns iprt status code. + * @param pwsz The string. + * @param cwc The max string length. Use RTSTR_MAX to process the entire string. + * @param pcch Where to store the string length (in bytes). Optional. + * This is undefined on failure. + */ +RTDECL(int) RTUtf16BigCalcUtf8LenEx(PCRTUTF16 pwsz, size_t cwc, size_t *pcch); + +/** + * Calculates the length of the UTF-16LE string in UTF-8 chars (bytes). + * + * This function will validate the string, and incorrectly encoded UTF-16LE + * strings will be rejected. + * + * @returns iprt status code. + * @param pwsz The string. + * @param cwc The max string length. Use RTSTR_MAX to process the entire string. + * @param pcch Where to store the string length (in bytes). Optional. + * This is undefined on failure. + */ +RTDECL(int) RTUtf16LittleCalcUtf8LenEx(PCRTUTF16 pwsz, size_t cwc, size_t *pcch); + +/** + * Translate a UTF-16 string into a Latin-1 (ISO-8859-1) allocating the result + * buffer (default tag). + * + * @returns iprt status code. + * @param pwszString UTF-16 string to convert. + * @param ppszString Receives pointer of allocated Latin1 string on + * success, and is always set to NULL on failure. + * The returned pointer must be freed using RTStrFree(). + */ +#define RTUtf16ToLatin1(pwszString, ppszString) RTUtf16ToLatin1Tag((pwszString), (ppszString), RTSTR_TAG) + +/** + * Translate a UTF-16 string into a Latin-1 (ISO-8859-1) allocating the result + * buffer (custom tag). + * + * @returns iprt status code. + * @param pwszString UTF-16 string to convert. + * @param ppszString Receives pointer of allocated Latin1 string on + * success, and is always set to NULL on failure. + * The returned pointer must be freed using RTStrFree(). + * @param pszTag Allocation tag used for statistics and such. + */ +RTDECL(int) RTUtf16ToLatin1Tag(PCRTUTF16 pwszString, char **ppszString, const char *pszTag); + +/** + * Translates UTF-16 to Latin-1 (ISO-8859-1) using buffer provided by the caller + * or a fittingly sized buffer allocated by the function (default tag). + * + * @returns iprt status code. + * @param pwszString The UTF-16 string to convert. + * @param cwcString The number of RTUTF16 items to translate from + * pwszString. The translation will stop when reaching + * cwcString or the terminator ('\\0'). Use RTSTR_MAX + * to translate the entire string. + * @param ppsz Pointer to the pointer to the Latin-1 string. The + * buffer can optionally be preallocated by the caller. + * + * If cch is zero, *ppsz is undefined. + * + * If cch is non-zero and *ppsz is not NULL, then this + * will be used as the output buffer. + * VERR_BUFFER_OVERFLOW will be returned if this is + * insufficient. + * + * If cch is zero or *ppsz is NULL, then a buffer of + * sufficient size is allocated. cch can be used to + * specify a minimum size of this buffer. Use + * RTUtf16Free() to free the result. + * + * @param cch The buffer size in chars (the type). This includes + * the terminator. + * @param pcch Where to store the length of the translated string, + * excluding the terminator. (Optional) + * + * This may be set under some error conditions, + * however, only for VERR_BUFFER_OVERFLOW and + * VERR_NO_STR_MEMORY will it contain a valid string + * length that can be used to resize the buffer. + */ +#define RTUtf16ToLatin1Ex(pwszString, cwcString, ppsz, cch, pcch) \ + RTUtf16ToLatin1ExTag((pwszString), (cwcString), (ppsz), (cch), (pcch), RTSTR_TAG) + +/** + * Translates UTF-16 to Latin-1 (ISO-8859-1) using buffer provided by the caller + * or a fittingly sized buffer allocated by the function (custom tag). + * + * @returns iprt status code. + * @param pwszString The UTF-16 string to convert. + * @param cwcString The number of RTUTF16 items to translate from + * pwszString. The translation will stop when reaching + * cwcString or the terminator ('\\0'). Use RTSTR_MAX + * to translate the entire string. + * @param ppsz Pointer to the pointer to the Latin-1 string. The + * buffer can optionally be preallocated by the caller. + * + * If cch is zero, *ppsz is undefined. + * + * If cch is non-zero and *ppsz is not NULL, then this + * will be used as the output buffer. + * VERR_BUFFER_OVERFLOW will be returned if this is + * insufficient. + * + * If cch is zero or *ppsz is NULL, then a buffer of + * sufficient size is allocated. cch can be used to + * specify a minimum size of this buffer. Use + * RTUtf16Free() to free the result. + * + * @param cch The buffer size in chars (the type). This includes + * the terminator. + * @param pcch Where to store the length of the translated string, + * excluding the terminator. (Optional) + * + * This may be set under some error conditions, + * however, only for VERR_BUFFER_OVERFLOW and + * VERR_NO_STR_MEMORY will it contain a valid string + * length that can be used to resize the buffer. + * @param pszTag Allocation tag used for statistics and such. + */ +RTDECL(int) RTUtf16ToLatin1ExTag(PCRTUTF16 pwszString, size_t cwcString, char **ppsz, size_t cch, size_t *pcch, const char *pszTag); + +/** + * Calculates the length of the UTF-16 string in Latin-1 (ISO-8859-1) chars. + * + * This function will validate the string, and incorrectly encoded UTF-16 + * strings will be rejected. The primary purpose of this function is to + * help allocate buffers for RTUtf16ToLatin1() of the correct size. For most + * other purposes RTUtf16ToLatin1Ex() should be used. + * + * @returns Number of char (bytes). + * @returns 0 if the string was incorrectly encoded. + * @param pwsz The UTF-16 string. + */ +RTDECL(size_t) RTUtf16CalcLatin1Len(PCRTUTF16 pwsz); + +/** + * Calculates the length of the UTF-16 string in Latin-1 (ISO-8859-1) chars. + * + * This function will validate the string, and incorrectly encoded UTF-16 + * strings will be rejected. + * + * @returns iprt status code. + * @param pwsz The string. + * @param cwc The max string length. Use RTSTR_MAX to process the + * entire string. + * @param pcch Where to store the string length (in bytes). Optional. + * This is undefined on failure. + */ +RTDECL(int) RTUtf16CalcLatin1LenEx(PCRTUTF16 pwsz, size_t cwc, size_t *pcch); + +/** + * Get the unicode code point at the given string position. + * + * @returns unicode code point. + * @returns RTUNICP_INVALID if the encoding is invalid. + * @param pwsz The string. + * + * @remark This is an internal worker for RTUtf16GetCp(). + */ +RTDECL(RTUNICP) RTUtf16GetCpInternal(PCRTUTF16 pwsz); + +/** + * Get the unicode code point at the given string position. + * + * @returns iprt status code. + * @param ppwsz Pointer to the string pointer. This will be updated to + * point to the char following the current code point. + * @param pCp Where to store the code point. + * RTUNICP_INVALID is stored here on failure. + * + * @remark This is an internal worker for RTUtf16GetCpEx(). + */ +RTDECL(int) RTUtf16GetCpExInternal(PCRTUTF16 *ppwsz, PRTUNICP pCp); + +/** + * Get the unicode code point at the given string position with length + * restriction. + * + * @returns iprt status code. + * @param ppwsz Pointer to the string pointer. This will be updated to + * point to the char following the current code point. + * @param pcwc Pointer to the max string length. This will be + * decremented corrsponding to the advancement of @a ppwsz. + * @param pCp Where to store the code point. + * RTUNICP_INVALID is stored here on failure. + * + * @remark This is an internal worker for RTUtf16GetCpNEx(). + */ +RTDECL(int) RTUtf16GetCpNExInternal(PCRTUTF16 *ppwsz, size_t *pcwc, PRTUNICP pCp); + +/** + * Get the unicode code point at the given string position, big endian. + * + * @returns iprt status code. + * @param ppwsz Pointer to the string pointer. This will be updated to + * point to the char following the current code point. + * @param pCp Where to store the code point. + * RTUNICP_INVALID is stored here on failure. + * + * @remark This is an internal worker for RTUtf16BigGetCpEx(). + */ +RTDECL(int) RTUtf16BigGetCpExInternal(PCRTUTF16 *ppwsz, PRTUNICP pCp); + +/** + * Put the unicode code point at the given string position + * and return the pointer to the char following it. + * + * This function will not consider anything at or following the + * buffer area pointed to by pwsz. It is therefore not suitable for + * inserting code points into a string, only appending/overwriting. + * + * @returns pointer to the char following the written code point. + * @param pwsz The string. + * @param CodePoint The code point to write. + * This should not be RTUNICP_INVALID or any other + * character out of the UTF-16 range. + * + * @remark This is an internal worker for RTUtf16GetCpEx(). + */ +RTDECL(PRTUTF16) RTUtf16PutCpInternal(PRTUTF16 pwsz, RTUNICP CodePoint); + +/** + * Get the unicode code point at the given string position. + * + * @returns unicode code point. + * @returns RTUNICP_INVALID if the encoding is invalid. + * @param pwsz The string. + * + * @remark We optimize this operation by using an inline function for + * everything which isn't a surrogate pair or an endian indicator. + */ +DECLINLINE(RTUNICP) RTUtf16GetCp(PCRTUTF16 pwsz) +{ + const RTUTF16 wc = *pwsz; + if (wc < 0xd800 || (wc > 0xdfff && wc < 0xfffe)) + return wc; + return RTUtf16GetCpInternal(pwsz); +} + +/** + * Get the unicode code point at the given string position. + * + * @returns iprt status code. + * @param ppwsz Pointer to the string pointer. This will be updated to + * point to the char following the current code point. + * @param pCp Where to store the code point. + * RTUNICP_INVALID is stored here on failure. + * + * @remark We optimize this operation by using an inline function for + * everything which isn't a surrogate pair or and endian indicator. + */ +DECLINLINE(int) RTUtf16GetCpEx(PCRTUTF16 *ppwsz, PRTUNICP pCp) +{ + const RTUTF16 wc = **ppwsz; + if (wc < 0xd800 || (wc > 0xdfff && wc < 0xfffe)) + { + (*ppwsz)++; + *pCp = wc; + return VINF_SUCCESS; + } + return RTUtf16GetCpExInternal(ppwsz, pCp); +} + +/** + * Get the unicode code point at the given string position. + * + * @returns iprt status code. + * @param ppwsz Pointer to the string pointer. This will be updated to + * point to the char following the current code point. + * @param pcwc Pointer to the max string length. This will be + * decremented corrsponding to the advancement of @a ppwsz. + * @param pCp Where to store the code point. RTUNICP_INVALID is stored + * here on failure. + * + * @remark We optimize this operation by using an inline function for + * everything which isn't a surrogate pair or and endian indicator. + */ +DECLINLINE(int) RTUtf16GetCpNEx(PCRTUTF16 *ppwsz, size_t *pcwc, PRTUNICP pCp) +{ + const size_t cwc = *pcwc; + if (cwc > 0) + { + const PCRTUTF16 pwsz = *ppwsz; + const RTUTF16 wc = *pwsz; + if (wc < 0xd800 || (wc > 0xdfff && wc < 0xfffe)) + { + *pCp = wc; + *pcwc = cwc - 1; + *ppwsz = pwsz + 1; + return VINF_SUCCESS; + } + } + return RTUtf16GetCpNExInternal(ppwsz, pcwc, pCp); +} + +/** + * Get the unicode code point at the given string position, big endian version. + * + * @returns iprt status code. + * @param ppwsz Pointer to the string pointer. This will be updated to + * point to the char following the current code point. + * @param pCp Where to store the code point. + * RTUNICP_INVALID is stored here on failure. + * + * @remark We optimize this operation by using an inline function for + * everything which isn't a surrogate pair or and endian indicator. + */ +DECLINLINE(int) RTUtf16BigGetCpEx(PCRTUTF16 *ppwsz, PRTUNICP pCp) +{ +#ifdef RT_BIG_ENDIAN + return RTUtf16GetCpEx(ppwsz, pCp); +#else +# ifdef IPRT_INCLUDED_asm_h + const RTUTF16 wc = RT_BE2H_U16(**ppwsz); + if (wc < 0xd800 || (wc > 0xdfff && wc < 0xfffe)) + { + (*ppwsz)++; + *pCp = wc; + return VINF_SUCCESS; + } +# endif + return RTUtf16BigGetCpExInternal(ppwsz, pCp); +#endif +} + +/** + * Put the unicode code point at the given string position + * and return the pointer to the char following it. + * + * This function will not consider anything at or following the + * buffer area pointed to by pwsz. It is therefore not suitable for + * inserting code points into a string, only appending/overwriting. + * + * @returns pointer to the char following the written code point. + * @param pwsz The string. + * @param CodePoint The code point to write. + * This should not be RTUNICP_INVALID or any other + * character out of the UTF-16 range. + * + * @remark We optimize this operation by using an inline function for + * everything which isn't a surrogate pair or and endian indicator. + */ +DECLINLINE(PRTUTF16) RTUtf16PutCp(PRTUTF16 pwsz, RTUNICP CodePoint) +{ + if (CodePoint < 0xd800 || (CodePoint > 0xd800 && CodePoint < 0xfffe)) + { + *pwsz++ = (RTUTF16)CodePoint; + return pwsz; + } + return RTUtf16PutCpInternal(pwsz, CodePoint); +} + +/** + * Skips ahead, past the current code point. + * + * @returns Pointer to the char after the current code point. + * @param pwsz Pointer to the current code point. + * @remark This will not move the next valid code point, only past the current one. + */ +DECLINLINE(PRTUTF16) RTUtf16NextCp(PCRTUTF16 pwsz) +{ + RTUNICP Cp; + RTUtf16GetCpEx(&pwsz, &Cp); + return (PRTUTF16)pwsz; +} + +/** + * Skips backwards, to the previous code point. + * + * @returns Pointer to the char after the current code point. + * @param pwszStart Pointer to the start of the string. + * @param pwsz Pointer to the current code point. + */ +RTDECL(PRTUTF16) RTUtf16PrevCp(PCRTUTF16 pwszStart, PCRTUTF16 pwsz); + + +/** + * Checks if the UTF-16 char is the high surrogate char (i.e. + * the 1st char in the pair). + * + * @returns true if it is. + * @returns false if it isn't. + * @param wc The character to investigate. + */ +DECLINLINE(bool) RTUtf16IsHighSurrogate(RTUTF16 wc) +{ + return wc >= 0xd800 && wc <= 0xdbff; +} + +/** + * Checks if the UTF-16 char is the low surrogate char (i.e. + * the 2nd char in the pair). + * + * @returns true if it is. + * @returns false if it isn't. + * @param wc The character to investigate. + */ +DECLINLINE(bool) RTUtf16IsLowSurrogate(RTUTF16 wc) +{ + return wc >= 0xdc00 && wc <= 0xdfff; +} + + +/** + * Checks if the two UTF-16 chars form a valid surrogate pair. + * + * @returns true if they do. + * @returns false if they doesn't. + * @param wcHigh The high (1st) character. + * @param wcLow The low (2nd) character. + */ +DECLINLINE(bool) RTUtf16IsSurrogatePair(RTUTF16 wcHigh, RTUTF16 wcLow) +{ + return RTUtf16IsHighSurrogate(wcHigh) + && RTUtf16IsLowSurrogate(wcLow); +} + +/** + * Formats a buffer stream as hex bytes. + * + * The default is no separating spaces or line breaks or anything. + * + * @returns IPRT status code. + * @retval VERR_INVALID_POINTER if any of the pointers are wrong. + * @retval VERR_BUFFER_OVERFLOW if the buffer is insufficent to hold the bytes. + * + * @param pwszBuf Output string buffer. + * @param cwcBuf The size of the output buffer in RTUTF16 units. + * @param pv Pointer to the bytes to stringify. + * @param cb The number of bytes to stringify. + * @param fFlags Combination of RTSTRPRINTHEXBYTES_F_XXX values. + * @sa RTStrPrintHexBytes. + */ +RTDECL(int) RTUtf16PrintHexBytes(PRTUTF16 pwszBuf, size_t cwcBuf, void const *pv, size_t cb, uint32_t fFlags); + +/** + * String printf producing UTF-16 output. + * + * @returns On success, positive count of formatted RTUTF16 units excluding the + * terminator. On buffer overflow, negative number giving the required + * buffer size (including terminator) in RTUTF16 units. + * + * @param pwszBuffer Output buffer. + * @param cwcBuffer Size of the output buffer in RTUTF16 units. + * @param pszFormat Pointer to the format string, @see pg_rt_str_format. + * @param args The format argument. + * + * @note This is similar to RTStrPrintf2V (not RTStrPrintfV)! + */ +RTDECL(ssize_t) RTUtf16PrintfV(PRTUTF16 pwszBuffer, size_t cwcBuffer, const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(3, 0); + +/** + * String printf producing UTF-16 output. + * + * @returns On success, positive count of formatted RTUTF16 units excluding the + * terminator. On buffer overflow, negative number giving the required + * buffer size (including terminator) in RTUTF16 units. + * + * @param pwszBuffer Output buffer. + * @param cwcBuffer Size of the output buffer in RTUTF16 units. + * @param pszFormat Pointer to the format string, @see pg_rt_str_format. + * @param ... The format argument. + * + * @note This is similar to RTStrPrintf2 (not RTStrPrintf)! + */ +RTDECL(ssize_t) RTUtf16Printf(PRTUTF16 pwszBuffer, size_t cwcBuffer, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(3, 4); + +/** + * String printf producing UTF-16 output with custom formatting. + * + * @returns On success, positive count of formatted RTUTF16 units excluding the + * terminator. On buffer overflow, negative number giving the required + * buffer size (including terminator) in RTUTF16 units. + * + * @param pfnFormat Pointer to handler function for the custom formats. + * @param pvArg Argument to the pfnFormat function. + * @param pwszBuffer Output buffer. + * @param cwcBuffer Size of the output buffer in RTUTF16 units. + * @param pszFormat Pointer to the format string, @see pg_rt_str_format. + * @param args The format argument. + * + * @note This is similar to RTStrPrintf2ExV (not RTStrPrintfExV)! + */ +RTDECL(ssize_t) RTUtf16PrintfExV(PFNSTRFORMAT pfnFormat, void *pvArg, PRTUTF16 pwszBuffer, size_t cwcBuffer, + const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(5, 0); + +/** + * String printf producing UTF-16 output with custom formatting. + * + * @returns On success, positive count of formatted RTUTF16 units excluding the + * terminator. On buffer overflow, negative number giving the required + * buffer size (including terminator) in RTUTF16 units. + * + * @param pfnFormat Pointer to handler function for the custom formats. + * @param pvArg Argument to the pfnFormat function. + * @param pwszBuffer Output buffer. + * @param cwcBuffer Size of the output buffer in RTUTF16 units. + * @param pszFormat Pointer to the format string, @see pg_rt_str_format. + * @param ... The format argument. + * + * @note This is similar to RTStrPrintf2Ex (not RTStrPrintfEx)! + */ +RTDECL(ssize_t) RTUtf16PrintfEx(PFNSTRFORMAT pfnFormat, void *pvArg, PRTUTF16 pwszBuffer, size_t cwcBuffer, + const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(5, 6); + +/** @} */ +RT_C_DECLS_END + +#endif /* !IPRT_INCLUDED_utf16_h */ + |