/*  
**********************************************************************
*   Copyright (C) 1999-2001, International Business Machines
*   Corporation and others.  All Rights Reserved.
**********************************************************************
*   file name:  ustr_imp.h
*   encoding:   US-ASCII
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2001jan30
*   created by: Markus W. Scherer
*/

#ifndef __USTR_IMP_H__
#define __USTR_IMP_H__

#include "unicode/utypes.h"
#include "unicode/ucnv.h"

/**
 * Are the Unicode properties loaded?
 * This must be used before internal functions are called that do
 * not perform this check.
 * @internal
 */
U_CFUNC UBool
uprv_haveProperties(void);

/**
 * Type of a function that may be passed to the internal case mapping functions
 * or similar for growing the destination buffer.
 * @internal
 */
typedef UBool U_CALLCONV
UGrowBuffer(void *context,      /* opaque pointer for this function */
            UChar **pBuffer,    /* in/out destination buffer pointer */
            int32_t *pCapacity, /* in/out buffer capacity in numbers of UChars */
            int32_t reqCapacity,/* requested capacity */
            int32_t length);    /* number of UChars to be copied to new buffer */

/**
 * Default implementation of UGrowBuffer.
 * Takes a static buffer as context, allocates a new buffer,
 * and releases the old one if it is not the same as the one passed as context.
 * @internal
 */
U_CAPI UBool /* U_CALLCONV U_EXPORT2 */
u_growBufferFromStatic(void *context,
                       UChar **pBuffer, int32_t *pCapacity, int32_t reqCapacity,
                       int32_t length);

/*
 * Internal string casing functions implementing ustring.c and UnicodeString
 * case mapping functions.
 * @internal
 */
U_CFUNC int32_t
u_internalStrToLower(UChar *dest, int32_t destCapacity,
                     const UChar *src, int32_t srcLength,
                     const char *locale,
                     UGrowBuffer *growBuffer, void *context,
                     UErrorCode *pErrorCode);

/**
 * @internal
 */
U_CFUNC int32_t
u_internalStrToUpper(UChar *dest, int32_t destCapacity,
                     const UChar *src, int32_t srcLength,
                     const char *locale,
                     UGrowBuffer *growBuffer, void *context,
                     UErrorCode *pErrorCode);

/**
 * Internal case folding function.
 * @internal
 */
U_CFUNC int32_t
u_internalStrFoldCase(UChar *dest, int32_t destCapacity,
                      const UChar *src, int32_t srcLength,
                      uint32_t options,
                      UGrowBuffer *growBuffer, void *context,
                      UErrorCode *pErrorCode);

/**
 * Return the full case folding mapping for c.
 * Must be used only if uprv_haveProperties() is true.
 * @internal
 */
U_CFUNC int32_t
u_internalFoldCase(UChar32 c, UChar dest[32], uint32_t options);

/**
 * Internal case-insensitive string compare function.
 * @internal
 */
U_CFUNC int32_t
u_internalStrcasecmp(const UChar *s1, int32_t length1,
                     const UChar *s2, int32_t length2,
                     uint32_t options);

/**
 * Internal, somewhat faster version of u_getCombiningClass()
 * for use by normalization quick check etc.
 * First make sure that data is loaded by u_getCombiningClass(0x300)!=0
 * or uprv_haveProperties() is true.
 * @internal
 */
U_CFUNC uint8_t
u_internalGetCombiningClass(UChar32 c);

/**
 * Get the default converter. This is a commonly used converter
 * that is used for the ustring and UnicodeString API.
 * Remember to use the u_releaseDefaultConverter when you are done.
 * @internal
 */
U_CAPI UConverter* U_EXPORT2
u_getDefaultConverter(UErrorCode *status);


/**
 * Release the default converter to the converter cache.
 * @internal
 */
U_CAPI void U_EXPORT2
u_releaseDefaultConverter(UConverter *converter);

/**
 * NUL-terminate a UChar * string if possible.
 * If length  < destCapacity then NUL-terminate.
 * If length == destCapacity then do not terminate but set U_STRING_NOT_TERMINATED_WARNING.
 * If length  > destCapacity then do not terminate but set U_BUFFER_OVERFLOW_ERROR.
 *
 * @param dest Destination buffer, can be NULL if destCapacity==0.
 * @param destCapacity Number of UChars available at dest.
 * @param length Number of UChars that were (to be) written to dest.
 * @param pErrorCode ICU error code.
 * @return length
 * @internal
 */
U_CAPI int32_t U_EXPORT2
u_terminateUChars(UChar *dest, int32_t destCapacity, int32_t length, UErrorCode *pErrorCode);

/**
 * NUL-terminate a char * string if possible.
 * Same as u_terminateUChars() but for a different string type.
 */
U_CAPI int32_t U_EXPORT2
u_terminateChars(char *dest, int32_t destCapacity, int32_t length, UErrorCode *pErrorCode);

/**
 * NUL-terminate a UChar32 * string if possible.
 * Same as u_terminateUChars() but for a different string type.
 */
U_CAPI int32_t U_EXPORT2
u_terminateUChar32s(UChar32 *dest, int32_t destCapacity, int32_t length, UErrorCode *pErrorCode);

/**
 * NUL-terminate a wchar_t * string if possible.
 * Same as u_terminateUChars() but for a different string type.
 */
U_CAPI int32_t U_EXPORT2
u_terminateWChars(wchar_t *dest, int32_t destCapacity, int32_t length, UErrorCode *pErrorCode);

#endif