/*****************************************************************************
*                                                                            *
*  PrimeSense PSCommon Library                                               *
*  Copyright (C) 2012 PrimeSense Ltd.                                        *
*                                                                            *
*  This file is part of PSCommon.                                            *
*                                                                            *
*  Licensed under the Apache License, Version 2.0 (the "License");           *
*  you may not use this file except in compliance with the License.          *
*  You may obtain a copy of the License at                                   *
*                                                                            *
*      http://www.apache.org/licenses/LICENSE-2.0                            *
*                                                                            *
*  Unless required by applicable law or agreed to in writing, software       *
*  distributed under the License is distributed on an "AS IS" BASIS,         *
*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  *
*  See the License for the specific language governing permissions and       *
*  limitations under the License.                                            *
*                                                                            *
*****************************************************************************/
//---------------------------------------------------------------------------
// Includes
//---------------------------------------------------------------------------
#include <XnOS.h>

//---------------------------------------------------------------------------
// Globals
//---------------------------------------------------------------------------
static const XnUInt32 xnOSStrCRC32Table[0x100] =
{
	0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
	0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
	0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
	0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
	0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
	0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
	0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
	0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
	0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
	0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
	0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
	0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
	0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
	0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
	0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
	0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
	0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
	0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
	0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
	0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
	0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
	0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
	0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
	0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
	0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
	0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
	0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
	0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
	0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
	0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
	0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
	0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
	0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
	0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
	0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
	0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
	0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
	0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
	0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
	0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
	0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
	0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
	0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
	0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
	0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
	0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
	0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
	0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
	0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
	0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
	0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
	0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
	0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
	0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
	0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
	0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
	0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
	0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
	0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
	0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
	0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
	0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
	0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
	0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
}; 

//---------------------------------------------------------------------------
// Code
//---------------------------------------------------------------------------
XN_C_API XnStatus xnOSStrPrefix(const XnChar* cpPrefixString, XnChar* cpDestString, const XnUInt32 nDestLength)
{
	// Local function variables
	XnChar* cpTempBuffer = NULL;
	XnUInt32 nOutStringLength = 0;

	// Validate the input/output pointers (to make sure none of them is NULL)
	XN_VALIDATE_INPUT_PTR(cpPrefixString);
	XN_VALIDATE_INPUT_PTR(cpDestString);

	// Calculate the final string length
	nOutStringLength = strlen(cpPrefixString) + strlen(cpDestString);

	// Make sure the destination string can hold the required information
	if (nOutStringLength >= nDestLength)
	{
		return (XN_STATUS_INTERNAL_BUFFER_TOO_SMALL);
	}

	// Allocate the temp buffer
	XN_VALIDATE_CALLOC(cpTempBuffer, XnChar, nOutStringLength + sizeof(XnChar));

	// Prefix the string
	strncat (cpTempBuffer, cpPrefixString, nOutStringLength);
	strncat (cpTempBuffer, cpDestString, nOutStringLength);

	// Copy the temp buffer into the output
	strncpy (cpDestString, cpTempBuffer, nOutStringLength);

	// Free the temporary buffer
	XN_FREE_AND_NULL(cpTempBuffer);

	// All is good...
	return (XN_STATUS_OK);
}

XN_C_API XnStatus xnOSStrAppend(XnChar* cpDestString, const XnChar* cpSrcString, const XnUInt32 nDestLength)
{
	// Validate the input/output pointers (to make sure none of them is NULL)
	XN_VALIDATE_INPUT_PTR(cpSrcString);
	XN_VALIDATE_INPUT_PTR(cpDestString);

	// Make sure the destination string can hold the required information
	if (strlen(cpSrcString) + strlen(cpDestString) >= nDestLength)
	{
		return (XN_STATUS_INTERNAL_BUFFER_TOO_SMALL);
	}

	// Prefix the string
	strncat (cpDestString, cpSrcString, nDestLength - strlen(cpDestString));

	// All is good...
	return (XN_STATUS_OK);
}

XN_C_API XnStatus xnOSStrCopy(XnChar* cpDestString, const XnChar* cpSrcString, const XnUInt32 nDestLength)
{
	// Validate the input/output pointers (to make sure none of them is NULL)
	XN_VALIDATE_INPUT_PTR(cpSrcString);
	XN_VALIDATE_INPUT_PTR(cpDestString);

	// Make sure the destination string can hold the required information
	if (strlen(cpSrcString) >= nDestLength)
	{
		return (XN_STATUS_INTERNAL_BUFFER_TOO_SMALL);
	}

	// Copy the string
	strncpy (cpDestString, cpSrcString, nDestLength);

	// All is good...
	return (XN_STATUS_OK);
}

XN_C_API XnUInt32 xnOSStrLen(const XnChar* cpString)
{
	XN_VALIDATE_PTR(cpString, 0);
	return strlen(cpString);
}

XN_C_API XnStatus xnOSStrNCopy(XnChar* cpDestString, const XnChar* cpSrcString, const XnUInt32 nCopyLength, const XnUInt32 nDestLength)
{
	// Validate the input/output pointers (to make sure none of them is NULL)
	XN_VALIDATE_INPUT_PTR(cpSrcString);
	XN_VALIDATE_INPUT_PTR(cpDestString);

	// Make sure the destination string can hold the required information
	if (nCopyLength > nDestLength)
	{
		return (XN_STATUS_INTERNAL_BUFFER_TOO_SMALL);
	}

	// Copy the string
	strncpy(cpDestString, cpSrcString, nCopyLength);

	// All is good...
	return (XN_STATUS_OK);
}

XN_C_API XnStatus xnOSStrCRC32(const XnChar* cpString, XnUInt32* nCRC32)
{
	// Local function variables
	XnUInt32 nTempCRC32 = 0xffffffff;
	XnUInt32 nStrLen = 0;
	XnUInt32 nIdx = 0;

	// Validate the input/output pointers (to make sure none of them is NULL)
	XN_VALIDATE_INPUT_PTR(cpString);
	XN_VALIDATE_OUTPUT_PTR(nCRC32);

	*nCRC32 = 0;

	nStrLen = strlen(cpString);

	for (nIdx = 0; nIdx < nStrLen; nIdx++)
	{
		nTempCRC32 = (nTempCRC32 >> 8) ^ xnOSStrCRC32Table[(nTempCRC32 & 0xFF) ^ *cpString++];
	}

	*nCRC32 = nTempCRC32 ^ 0xffffffff; 

	// All is good...
	return (XN_STATUS_OK);

}

XN_C_API XnStatus xnOSStrNCRC32(XnUChar* cpBuffer, XnUInt32 nBufferSize, XnUInt32* nCRC32)
{
	// Local function variables
	XnUInt32 nTempCRC32 = 0xffffffff;
	XnUInt32 nIdx = 0;

	// Validate the input/output pointers (to make sure none of them is NULL)
	XN_VALIDATE_INPUT_PTR(cpBuffer);
	XN_VALIDATE_OUTPUT_PTR(nCRC32);

	*nCRC32 = 0;

	for (nIdx = 0; nIdx < nBufferSize; nIdx++)
	{
		nTempCRC32 = (nTempCRC32 >> 8) ^ xnOSStrCRC32Table[(nTempCRC32 & 0xFF) ^ *cpBuffer++];
	}

	*nCRC32 = nTempCRC32 ^ 0xffffffff; 

	// All is good...
	return (XN_STATUS_OK);
}

XN_C_API XnStatus xnOSStrFormatV(XnChar* cpDestString, const XnUInt32 nDestLength, XnUInt32* pnBytesWritten, const XnChar* cpFormat, va_list args)
{
	// Validate the input/output pointers (to make sure none of them is NULL)
	XN_VALIDATE_INPUT_PTR(cpDestString);
	XN_VALIDATE_INPUT_PTR(cpFormat);
	XN_VALIDATE_OUTPUT_PTR(pnBytesWritten);

	*pnBytesWritten = 0;

	XnInt32 nRes = vsnprintf(cpDestString, nDestLength, cpFormat, args);

	// nRes is the number of bytes written, not including NULL termination

	if ((nRes == -1) ||	// string was truncated
		(nRes == (XnInt32)nDestLength && cpDestString[nRes] != '\0')) // no space for the NULL termination
	{
		return (XN_STATUS_INTERNAL_BUFFER_TOO_SMALL);
	}

	// return byte count (string length)
	*pnBytesWritten = nRes;

	// All is good...
	return (XN_STATUS_OK);
}

XN_C_API void xnOSItoA(XnInt32 nValue, XnChar* cpStr, XnInt32 nBase)
{
	static XnChar cNum[] = "0123456789abcdefghijklmnopqrstuvwxyz";
	XnChar* cpWStr = cpStr;
	XnInt32 nSign;

	// Validate base
	if (nBase < 2 || nBase > 35)
	{
		*cpWStr = '\0';
		return;
	}

	// Take care of sign
	if ((nSign = nValue) < 0)
	{
		nValue = -nValue;
	}

	// Conversion. Number is reversed.
	do *cpWStr++ = cNum[nValue % nBase]; while(nValue /= nBase);

	if(nSign<0) *cpWStr++='-';

	*cpWStr='\0';

	// Reverse string
	XnChar cAux;
	XnChar* cpBegin = cpStr;
	XnChar* cpEnd = cpWStr-1;

	while(cpEnd > cpBegin)
	{
		cAux=*cpEnd;
		*cpEnd--=*cpBegin;
		*cpBegin++=cAux;
	}
}

XN_C_API XnInt32 xnOSStrCmp(const XnChar* cpFirstString, const XnChar* cpSecondString)
{
	// Validate the input/output pointers (to make sure none of them is NULL)
	XN_VALIDATE_INPUT_PTR(cpFirstString);
	XN_VALIDATE_INPUT_PTR(cpSecondString);

	return strcmp(cpFirstString, cpSecondString);
}

XN_C_API XnInt32 xnOSStrCaseCmp(const XnChar* cpFirstString, const XnChar* cpSecondString)
{
	// Validate the input/output pointers (to make sure none of them is NULL)
	XN_VALIDATE_INPUT_PTR(cpFirstString);
	XN_VALIDATE_INPUT_PTR(cpSecondString);

	return strcasecmp(cpFirstString, cpSecondString);
}

XN_C_API XnStatus XN_C_DECL xnOSGetEnvironmentVariable(const XnChar* strEnv, XnChar* strDest, XnUInt32 nDestSize)
{
	XnStatus nRetVal = XN_STATUS_OK;
	
	XN_VALIDATE_INPUT_PTR(strEnv);
	XN_VALIDATE_INPUT_PTR(strDest);

	char* strRes = getenv(strEnv);
	if (strRes == NULL)
	{
		return (XN_STATUS_OS_ENV_VAR_NOT_FOUND);
	}
	
	nRetVal = xnOSStrCopy(strDest, strRes, nDestSize);
	XN_IS_STATUS_OK(nRetVal);
	
	return (XN_STATUS_OK);
}