/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

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, either version 3 of the License, or
(at your option) any later version.

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 <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
/*****************************************************************************
*
*   $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtStr.cpp
*   
***/

#include "pnUtStr.h"


/*****************************************************************************
*
*   Private data
*
***/

// These random values were generated by the radioactive decay based
// random number generator at www.fourmilab.ch
static uint32_t s_hashValue[] = {
    0xc30d2a72, 0x15efaec1, 0xd250c7d9, 0xaf3c60a8,
    0x9608ae8f, 0x452c0e11, 0xb6840ffd, 0x3e36c913,
    0x2864eace, 0x9b0a17d6, 0x108da74b, 0xf2c479c1,
    0x8b4dd597, 0x97199bc0, 0x621f0cce, 0x1658553e,
};


/****************************************************************************
*
*   Internal functions
*
***/
//===========================================================================
template<class chartype>
static unsigned IStrLen (const chartype str[]) {
    unsigned chars = 0;
    for (; *str++; ++chars)
        NULL_STMT;
    return chars;
}

//===========================================================================
template<class chartype>
static void IStrCopy (chartype * dest, const chartype source[], unsigned chars) {
    while ((chars > 1) && ((*dest = *source++) != 0)) {
        --chars;
        ++dest;
    }
    if (chars)
        *dest = 0;
}

//===========================================================================
template<class chartype>
static chartype * IStrDup (const chartype str[]) {
    unsigned chars = IStrLen(str) + 1;
    chartype * buffer = (chartype *)malloc(chars * sizeof(chartype));
    IStrCopy(buffer, str, chars);
    return buffer;
}


//===========================================================================
template<typename chartype>
static unsigned IStrPrintfValidate (chartype * dest, unsigned count, int result) {
    if (!count)
        return 0;
    ASSERT(result <= (int)count);
    if ((result < 0) || (result == (int)count)) {
        dest[count - 1] = 0;
        return count - 1;
    }
    else
        return (unsigned)result;
}

//===========================================================================
template<class chartype>
static int IStrCmp (const chartype str1[], const chartype str2[], unsigned chars) {
    for (; chars--; ++str1, ++str2) {
        if (*str1 != *str2)
            return (*str1 > *str2) ? 1 : -1;
        if (!*str1)
            return 0;
    }
    return 0;
}

//===========================================================================
template<class chartype>
static int IStrCmpI (const chartype str1[], const chartype str2[], unsigned chars) {
    while (chars--) {
        chartype ch1 = CharLowerFast(*str1++);
        chartype ch2 = CharLowerFast(*str2++);
        if (ch1 != ch2)
            return (ch1 > ch2) ? 1 : -1;
        if (!ch1)
            return 0;
    }
    return 0;
}

//===========================================================================
template<class chartype>
static uint32_t IStrHash (const chartype str[], unsigned chars) {
    uint32_t temp0  = 0xE2C15C9D;
    uint32_t temp1  = 0x2170A28A;
    uint32_t result = 0x325D1EAE;
    for (unsigned ch; chars-- && ((ch = (unsigned)*str) != 0); ++str) {
        temp0   = (temp0 << 3) ^ ch;
        temp1  += s_hashValue[temp0 & 0x0F];
        result ^= temp0 + temp1;
    }
    return result;
}

//===========================================================================
template<class chartype>
static uint32_t IStrHashI (const chartype str[], unsigned chars) {
    uint32_t temp0  = 0xE2C15C9D;
    uint32_t temp1  = 0x2170A28A;
    uint32_t result = 0x325D1EAE;
    for (unsigned ch; chars-- && ((ch = (unsigned)*str) != 0); ++str) {
        if ((ch >= 'a') && (ch <= 'z'))
            ch = ch + 'A' - 'a';
        temp0   = (temp0 << 3) ^ ch;
        temp1  += s_hashValue[temp0 & 0x0F];
        result ^= temp0 + temp1;
    }
    return result;
}



/****************************************************************************
*
*   Exported functions
*
***/

//===========================================================================
char * StrDup (const char str[]) {
    return IStrDup(str);
}

//===========================================================================
wchar_t * StrDup (const wchar_t str[]) {
    return IStrDup(str);
}

//===========================================================================
unsigned StrPrintf (char * dest, unsigned count, const char format[], ...) {
    va_list argList;
    va_start(argList, format);
    int result = hsVsnprintf((char *)dest, count, (const char *)format, argList);
    va_end(argList);
    return IStrPrintfValidate(dest, count, result);
}

//===========================================================================
unsigned StrPrintf (wchar_t * dest, unsigned count, const wchar_t format[], ...) {
    va_list argList;
    va_start(argList, format);
    int result = hsVsnwprintf(dest, count, format, argList);
    va_end(argList);
    return IStrPrintfValidate(dest, count, result);
}

//===========================================================================
unsigned StrPrintfV (char * dest, unsigned count, const char format[], va_list args) {
    int result = hsVsnprintf(dest, count, format, args);
    return IStrPrintfValidate(dest, count, result);
}

//===========================================================================
unsigned StrPrintfV (wchar_t * dest, unsigned count, const wchar_t format[], va_list args) {
    int result = hsVsnwprintf(dest, count, format, args);
    return IStrPrintfValidate(dest, count, result);
}

//===========================================================================
int StrCmp (const char str1[], const char str2[], unsigned chars) {
    return IStrCmp(str1, str2, chars);
}

//===========================================================================
int StrCmp (const wchar_t str1[], const wchar_t str2[], unsigned chars) {
    return IStrCmp(str1, str2, chars);
}

//===========================================================================
int StrCmpI (const char str1[], const char str2[], unsigned chars) {
    return IStrCmpI(str1, str2, chars);
}

//===========================================================================
int StrCmpI (const wchar_t str1[], const wchar_t str2[], unsigned chars) {
    return IStrCmpI(str1, str2, chars);
}

//===========================================================================
void StrCopy (char * dest, const char source[], unsigned chars) {
    IStrCopy(dest, source, chars);
}

//===========================================================================
void StrCopy (wchar_t * dest, const wchar_t source[], unsigned chars) {
    IStrCopy(dest, source, chars);
}

//===========================================================================
unsigned StrLen (const char str[]) {
    return IStrLen(str);
}

//===========================================================================
unsigned StrLen (const wchar_t str[]) {
    return IStrLen(str);
}

//===========================================================================
uint32_t StrHash (const char str[], unsigned chars) {
    return IStrHash(str, chars);
}

//===========================================================================
uint32_t StrHash (const wchar_t str[], unsigned chars) {
    return IStrHash(str, chars);
}

//===========================================================================
uint32_t StrHashI (const char str[], unsigned chars) {
    return IStrHashI(str, chars);
}

//===========================================================================
uint32_t StrHashI (const wchar_t str[], unsigned chars) {
    return IStrHashI(str, chars);
}