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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
+----------------------------------------------------------------------------------------------------------- */
+
+/**************************  Fraunhofer IIS FDK SysLib  **********************
+
+   Author(s):
+   Description: string conversion functions
+
+******************************************************************************/
+
+
+
+#include "genericStds.h"
+#include "conv_string.h"
+
+INT charBuf2HexString(char *string, UCHAR *charBuf, INT charBufLength)
+{
+  INT i;
+  UCHAR c1, c2;
+
+  /* sanity checks */
+  /* check array length */
+  if (charBufLength == 0) {
+    return -1;
+  }
+
+  /* define hex string Table */
+  UCHAR hexSymb[16]={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
+
+  /* calculate corresponding hex string from charBuffer */
+  for (i=0;i<charBufLength;i++) {
+    c1 = ((charBuf[i])>>4)&0x0f; /* upper nibble */
+    c2 = (charBuf[i])&0x0f;      /* lower nibble */
+
+    string[i*2]   = hexSymb[c1];  /* convert to string */
+    string[i*2+1] = hexSymb[c2];  /* convert to string */
+  }
+
+  /* terminate string */
+  string[charBufLength<<1]='\0';
+
+  return 0;
+
+}
+
+INT hexString2CharBuf(const char *string, UCHAR *charBuf, UINT charBufLength)
+{
+  UINT i, k = 0;
+  UCHAR hNibble, lNibble;
+
+  /* sanity checks */
+  if (string[0] == '\0') {
+    return -1; /* invalid string size */
+  }
+
+  if (charBufLength<=0){
+    return -2; /* invalid buffer size */
+  }
+
+  /* convert to hex characters to corresponding 8bit value */
+  for (i=0;(string[i]!='\0')&&((i>>1)<charBufLength);i+=2) {
+    k = i>>1;
+    hNibble = hexChar2Dec(string[i]);
+    lNibble = hexChar2Dec(string[i+1]);
+    if ((hNibble == 16) || (lNibble == 16)) {
+      return -3; /* invalid character */
+    }
+    charBuf[k] = ((hNibble<<4)&0xf0) + lNibble;
+  }
+
+  /* check if last character was string terminator */
+  if ((string[i-2]!=0) && (string[i]!=0)) {
+    return -1; /* invalid string size */
+  }
+
+  /* fill charBuffer with zeros */
+  for (i=k+1;i<charBufLength;i++) {
+    charBuf[i] = 0;
+  }
+
+  return 0;
+
+}
+
+UCHAR hexChar2Dec(const char c)
+{
+  INT r = 0;
+  if ((c >= '0') && (c <= '9'))
+    r = c-'0';
+  else if ((c >= 'a') && (c <= 'f'))
+    r = c-'a'+10;
+  else if ((c >= 'A') && (c <= 'F'))
+    r = c-'A'+10;
+  else
+    r = 16; /* invalid hex character */
+
+  return (UCHAR)r;
+}
+