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authorThe Android Open Source Project <initial-contribution@android.com>2012-07-11 10:15:24 -0700
committerThe Android Open Source Project <initial-contribution@android.com>2012-07-11 10:15:24 -0700
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tree57f3d390ebb0782cc0de0fb984c8ea7e45b4f386 /libFDK/src/FDK_crc.cpp
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Change-Id: If584e579464f28b97d50e51fc76ba654a5536c54
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+
+/* -----------------------------------------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+ All rights reserved.
+
+ 1. INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
+the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
+This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
+audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
+independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
+of the MPEG specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
+may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
+individually for the purpose of encoding or decoding bit streams in products that are compliant with
+the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
+these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
+software may already be covered under those patent licenses when it is used for those licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
+are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
+applications information and documentation.
+
+2. COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification, are permitted without
+payment of copyright license fees provided that you satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
+your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation and/or other materials
+provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
+You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived from this library without
+prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
+software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
+and the date of any change. For modified versions of the FDK AAC Codec, the term
+"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
+"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
+
+3. NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
+ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
+respect to this software.
+
+You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
+by appropriate patent licenses.
+
+4. DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
+"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
+of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
+including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
+or business interruption, however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of this software, even if
+advised of the possibility of such damage.
+
+5. CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------------------------------------- */
+
+/******************************** MPEG Audio Encoder **************************
+
+ Initial author:
+ contents/description: CRC calculation
+
+******************************************************************************/
+
+#include "FDK_crc.h"
+
+
+
+/*---------------- constants -----------------------*/
+
+/**
+ * \brief This table defines precalculated lookup tables for crc polynom x^16 + x^15 + x^2 + x^0.
+ */
+static const USHORT crcLookup_16_15_2_0[256] =
+{
+ 0x0000, 0x8005, 0x800f, 0x000a, 0x801b, 0x001e, 0x0014, 0x8011,
+ 0x8033, 0x0036, 0x003c, 0x8039, 0x0028, 0x802d, 0x8027, 0x0022,
+ 0x8063, 0x0066, 0x006c, 0x8069, 0x0078, 0x807d, 0x8077, 0x0072,
+ 0x0050, 0x8055, 0x805f, 0x005a, 0x804b, 0x004e, 0x0044, 0x8041,
+ 0x80c3, 0x00c6, 0x00cc, 0x80c9, 0x00d8, 0x80dd, 0x80d7, 0x00d2,
+ 0x00f0, 0x80f5, 0x80ff, 0x00fa, 0x80eb, 0x00ee, 0x00e4, 0x80e1,
+ 0x00a0, 0x80a5, 0x80af, 0x00aa, 0x80bb, 0x00be, 0x00b4, 0x80b1,
+ 0x8093, 0x0096, 0x009c, 0x8099, 0x0088, 0x808d, 0x8087, 0x0082,
+ 0x8183, 0x0186, 0x018c, 0x8189, 0x0198, 0x819d, 0x8197, 0x0192,
+ 0x01b0, 0x81b5, 0x81bf, 0x01ba, 0x81ab, 0x01ae, 0x01a4, 0x81a1,
+ 0x01e0, 0x81e5, 0x81ef, 0x01ea, 0x81fb, 0x01fe, 0x01f4, 0x81f1,
+ 0x81d3, 0x01d6, 0x01dc, 0x81d9, 0x01c8, 0x81cd, 0x81c7, 0x01c2,
+ 0x0140, 0x8145, 0x814f, 0x014a, 0x815b, 0x015e, 0x0154, 0x8151,
+ 0x8173, 0x0176, 0x017c, 0x8179, 0x0168, 0x816d, 0x8167, 0x0162,
+ 0x8123, 0x0126, 0x012c, 0x8129, 0x0138, 0x813d, 0x8137, 0x0132,
+ 0x0110, 0x8115, 0x811f, 0x011a, 0x810b, 0x010e, 0x0104, 0x8101,
+ 0x8303, 0x0306, 0x030c, 0x8309, 0x0318, 0x831d, 0x8317, 0x0312,
+ 0x0330, 0x8335, 0x833f, 0x033a, 0x832b, 0x032e, 0x0324, 0x8321,
+ 0x0360, 0x8365, 0x836f, 0x036a, 0x837b, 0x037e, 0x0374, 0x8371,
+ 0x8353, 0x0356, 0x035c, 0x8359, 0x0348, 0x834d, 0x8347, 0x0342,
+ 0x03c0, 0x83c5, 0x83cf, 0x03ca, 0x83db, 0x03de, 0x03d4, 0x83d1,
+ 0x83f3, 0x03f6, 0x03fc, 0x83f9, 0x03e8, 0x83ed, 0x83e7, 0x03e2,
+ 0x83a3, 0x03a6, 0x03ac, 0x83a9, 0x03b8, 0x83bd, 0x83b7, 0x03b2,
+ 0x0390, 0x8395, 0x839f, 0x039a, 0x838b, 0x038e, 0x0384, 0x8381,
+ 0x0280, 0x8285, 0x828f, 0x028a, 0x829b, 0x029e, 0x0294, 0x8291,
+ 0x82b3, 0x02b6, 0x02bc, 0x82b9, 0x02a8, 0x82ad, 0x82a7, 0x02a2,
+ 0x82e3, 0x02e6, 0x02ec, 0x82e9, 0x02f8, 0x82fd, 0x82f7, 0x02f2,
+ 0x02d0, 0x82d5, 0x82df, 0x02da, 0x82cb, 0x02ce, 0x02c4, 0x82c1,
+ 0x8243, 0x0246, 0x024c, 0x8249, 0x0258, 0x825d, 0x8257, 0x0252,
+ 0x0270, 0x8275, 0x827f, 0x027a, 0x826b, 0x026e, 0x0264, 0x8261,
+ 0x0220, 0x8225, 0x822f, 0x022a, 0x823b, 0x023e, 0x0234, 0x8231,
+ 0x8213, 0x0216, 0x021c, 0x8219, 0x0208, 0x820d, 0x8207, 0x0202
+};
+
+/**
+ * \brief This table defines precalculated lookup tables for crc polynom x^16 + x^12 + x^5 + x^0.
+ */
+static const USHORT crcLookup_16_12_5_0[256] =
+{
+ 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
+ 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
+ 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
+ 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
+ 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
+ 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
+ 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
+ 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
+ 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
+ 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
+ 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
+ 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
+ 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
+ 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
+ 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
+ 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
+ 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
+ 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
+ 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
+ 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
+ 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
+ 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
+ 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
+ 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
+ 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
+ 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
+ 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
+ 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
+ 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
+ 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
+ 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
+ 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
+};
+
+
+/*--------------- function declarations --------------------*/
+
+static inline INT calcCrc_Bits(
+ USHORT * const pCrc,
+ USHORT crcMask,
+ USHORT crcPoly,
+ HANDLE_FDK_BITSTREAM hBs,
+ INT nBits
+ );
+
+static inline INT calcCrc_Bytes(
+ USHORT * const pCrc,
+ const USHORT * pCrcLookup,
+ HANDLE_FDK_BITSTREAM hBs,
+ INT nBytes
+ );
+
+static void crcCalc(
+ HANDLE_FDK_CRCINFO hCrcInfo,
+ HANDLE_FDK_BITSTREAM hBs,
+ const INT reg
+ );
+
+
+/*------------- function definitions ----------------*/
+
+void FDKcrcInit(
+ HANDLE_FDK_CRCINFO hCrcInfo,
+ const UINT crcPoly,
+ const UINT crcStartValue,
+ const UINT crcLen
+ )
+{
+ /* crc polynom example:
+ x^16 + x^15 + x^2 + x^0 (1) 1000 0000 0000 0101 -> 0x8005
+ x^16 + x^12 + x^5 + x^0 (1) 0001 0000 0010 0001 -> 0x1021
+ x^8 + x^4 + x^3 + x^2 + x^0 (1) 0001 1101 -> 0x001d */
+
+ hCrcInfo->crcLen = crcLen;
+ hCrcInfo->crcPoly = crcPoly;
+ hCrcInfo->startValue = crcStartValue;
+ hCrcInfo->crcMask = (crcLen) ? (1<<(crcLen-1)) : 0;
+
+ FDKcrcReset(hCrcInfo);
+
+ hCrcInfo->pCrcLookup = 0;
+
+ if (hCrcInfo->crcLen==16) {
+ switch ( crcPoly ) {
+ case 0x8005:
+ hCrcInfo->pCrcLookup = crcLookup_16_15_2_0;
+ break;
+ case 0x1021:
+ hCrcInfo->pCrcLookup = crcLookup_16_12_5_0;
+ break;
+ case 0x001d:
+ default:
+ /* no lookup table */
+ hCrcInfo->pCrcLookup = 0;
+ }
+ }
+
+
+}
+
+void FDKcrcReset(HANDLE_FDK_CRCINFO hCrcInfo)
+{
+ int i;
+
+ hCrcInfo->crcValue = hCrcInfo->startValue;
+
+ for(i=0;i<MAX_CRC_REGS;i++) {
+ hCrcInfo->crcRegData[i].isActive = 0;
+ }
+ hCrcInfo->regStart = 0;
+ hCrcInfo->regStop = 0;
+}
+
+INT FDKcrcStartReg(
+ HANDLE_FDK_CRCINFO hCrcInfo,
+ const HANDLE_FDK_BITSTREAM hBs,
+ const INT mBits
+ )
+{
+ int reg = hCrcInfo->regStart;
+
+ FDK_ASSERT(hCrcInfo->crcRegData[reg].isActive==0);
+ hCrcInfo->crcRegData[reg].isActive = 1;
+ hCrcInfo->crcRegData[reg].maxBits = mBits;
+ hCrcInfo->crcRegData[reg].validBits = FDKgetValidBits(hBs) ;
+ hCrcInfo->crcRegData[reg].bitBufCntBits = 0;
+
+ hCrcInfo->regStart = (hCrcInfo->regStart+1)%MAX_CRC_REGS;
+
+ return (reg);
+}
+
+INT FDKcrcEndReg(
+ HANDLE_FDK_CRCINFO hCrcInfo,
+ const HANDLE_FDK_BITSTREAM hBs,
+ const INT reg
+ )
+{
+ FDK_ASSERT((reg==(INT)hCrcInfo->regStop)&&(hCrcInfo->crcRegData[reg].isActive==1));
+
+ if (hBs->ConfigCache==BS_WRITER) {
+ hCrcInfo->crcRegData[reg].bitBufCntBits = FDKgetValidBits(hBs) - hCrcInfo->crcRegData[reg].validBits;
+ }
+ else {
+ hCrcInfo->crcRegData[reg].bitBufCntBits = hCrcInfo->crcRegData[reg].validBits - FDKgetValidBits(hBs);
+ }
+
+ if (hCrcInfo->crcRegData[reg].maxBits == 0) {
+ hCrcInfo->crcRegData[reg].maxBits = hCrcInfo->crcRegData[reg].bitBufCntBits;
+ }
+
+ crcCalc( hCrcInfo, hBs, reg);
+
+ hCrcInfo->crcRegData[reg].isActive = 0;
+ hCrcInfo->regStop = (hCrcInfo->regStop+1)%MAX_CRC_REGS;
+
+ return 0;
+}
+
+USHORT FDKcrcGetCRC(
+ const HANDLE_FDK_CRCINFO hCrcInfo
+ )
+{
+ return ( hCrcInfo->crcValue & (((hCrcInfo->crcMask-1)<<1)+1) );
+}
+
+/**
+ * \brief Calculate crc bits.
+ *
+ * Calculate crc starting at current bitstream postion over nBits.
+ *
+ * \param pCrc Pointer to an outlying allocated crc info structure.
+ * \param crcMask CrcMask in use.
+ * \param crcPoly Crc polynom in use.
+ * \param hBs Handle to current bit buffer structure.
+ * \param nBits Number of processing bits.
+ *
+ * \return Number of processed bits.
+ */
+static inline INT calcCrc_Bits(
+ USHORT * const pCrc,
+ USHORT crcMask,
+ USHORT crcPoly,
+ HANDLE_FDK_BITSTREAM hBs,
+ INT nBits
+ )
+{
+ int i;
+ USHORT crc = *pCrc; /* get crc value */
+
+ if (hBs!=NULL) {
+ for (i = 0; (i < nBits); i++) {
+ USHORT tmp = FDKreadBits(hBs,1); // process single bit
+ tmp ^= ( (crc & crcMask) ? 1 : 0 );
+ tmp *= crcPoly;
+ crc <<= 1;
+ crc ^= tmp;
+ }
+ }
+ else {
+ for (i = 0; (i < nBits); i++) {
+ USHORT tmp = 0; // process single bit
+ tmp ^= ( (crc & crcMask) ? 1 : 0 );
+ tmp *= crcPoly;
+ crc <<= 1;
+ crc ^= tmp;
+ }
+ }
+ *pCrc = crc; /* update crc value */
+
+ return nBits;
+}
+
+/**
+ * \brief Calculate crc bytes.
+ *
+ * Calculate crc starting at current bitstream postion over nBytes.
+ *
+ * \param pCrc Pointer to an outlying allocated crc info structure.
+ * \param pCrcLookup Pointer to lookup table used for fast crc calculation.
+ * \param hBs Handle to current bit buffer structure.
+ * \param nBits Number of processing bytes.
+ *
+ * \return Number of processed bits.
+ */
+static inline INT calcCrc_Bytes(
+ USHORT * const pCrc,
+ const USHORT * pCrcLookup,
+ HANDLE_FDK_BITSTREAM hBs,
+ INT nBytes
+ )
+{
+ int i;
+ USHORT crc = *pCrc; /* get crc value */
+
+ if (hBs!=NULL) {
+ for (i=0; i<nBytes; i++) {
+ crc = (crc<<8)^pCrcLookup[((crc>>8)^((UCHAR)FDKreadBits(hBs,8)))&0xFF];
+ }
+ }
+ else {
+ for (i=0; i<nBytes; i++) {
+ crc = (crc<<8)^pCrcLookup[((crc>>8)^((UCHAR)0))&0xFF];
+ }
+ }
+
+ *pCrc = crc; /* update crc value */
+
+ return (i);
+}
+
+/**
+ * \brief Calculate crc.
+ *
+ * Calculate crc. Lenght depends on mBits parameter in FDKcrcStartReg() configuration.
+ *
+ * \param hCrcInfo Pointer to an outlying allocated crc info structure.
+ * \param hBs Pointer to current bit buffer structure.
+ * \param reg Crc region ID.
+ *
+ * \return Number of processed bits.
+ */
+static void crcCalc(
+ HANDLE_FDK_CRCINFO hCrcInfo,
+ HANDLE_FDK_BITSTREAM hBs,
+ const INT reg
+ )
+{
+ USHORT crc = hCrcInfo->crcValue;
+ CCrcRegData *rD = &hCrcInfo->crcRegData[reg];
+ FDK_BITSTREAM bsReader;
+
+ if (hBs->ConfigCache==BS_READER) {
+ bsReader = *hBs;
+ FDKpushBiDirectional(&bsReader, -(INT)(rD->validBits-FDKgetValidBits(&bsReader)));
+ }
+ else {
+ FDKinitBitStream(&bsReader, hBs->hBitBuf.Buffer, hBs->hBitBuf.bufSize, hBs->hBitBuf.ValidBits, BS_READER);
+ FDKpushBiDirectional(&bsReader, rD->validBits);
+ }
+
+ int bits, rBits;
+ rBits = (rD->maxBits>=0) ? rD->maxBits : -rD->maxBits; /* ramaining bits */
+ if ((rD->maxBits>0) && (((INT)rD->bitBufCntBits>>3<<3)<rBits) ) {
+ bits = rD->bitBufCntBits;
+ }
+ else {
+ bits = rBits;
+ }
+
+ int words = bits >> 3; /* processing bytes */
+ int mBits = bits & 0x7; /* modulo bits */
+
+ if(hCrcInfo->pCrcLookup) {
+ rBits -= (calcCrc_Bytes(&crc, hCrcInfo->pCrcLookup, &bsReader, words)<<3);
+ }
+ else {
+ rBits -= calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, &bsReader, words<<3 );
+ }
+
+ /* remaining valid bits*/
+ if(mBits!=0) {
+ rBits -= calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, &bsReader, mBits );
+ }
+
+ if (rBits!=0) {
+ /* zero bytes */
+ if ( (hCrcInfo->pCrcLookup) && (rBits>8) ) {
+ rBits -= (calcCrc_Bytes(&crc, hCrcInfo->pCrcLookup, NULL, rBits>>3)<<3);
+ }
+ /* remaining zero bits */
+ if (rBits!=0) {
+ rBits -= calcCrc_Bits(&crc, hCrcInfo->crcMask, hCrcInfo->crcPoly, NULL, rBits );
+ }
+ }
+
+ hCrcInfo->crcValue = crc;
+}
+