text: /**
    ******************************************************************************
    * @file    lib_NDEF_Text.h
    * @author  MMY Application Team
    * @version $Revision: 3210 $
    * @date    $Date: 2016-12-05 15:37:48 +0100 (Mon, 05 Dec 2016) $
    * @brief   This file help to manage Text NDEF file.
     ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; COPYRIGHT 2015 STMicroelectronics</center></h2>
    *
    * Licensed under ST MYLIBERTY SOFTWARE LICENSE AGREEMENT (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.st.com/myliberty  
    *
    * 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,
    * AND SPECIFICALLY DISCLAIMING THE IMPLIED WARRANTIES OF MERCHANTABILITY,
    * FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
    * See the License for the specific language governing permissions and
    * limitations under the License.
    *
    ******************************************************************************
    */
  
  /* Includes ------------------------------------------------------------------*/
  #include "lib_NDEF_Text.h"
  
  /** @addtogroup NFC_libraries
    * @{
    * @brief  <b>This is the library used to manage the content of the TAG (data)
    *          But also the specific feature of the tag, for instance
    *          password, gpo... </b>
    */
  
  
  /** @addtogroup libNFC_FORUM
    * @{
    * @brief  This part of the library manage data which follow NFC forum organisation.
    */
  
  /**
    * @brief  This buffer contains the data send/received by TAG
    */
  extern uint8_t NDEF_Buffer [];
  
  /**
    * @}
    */
  
  /** @defgroup libEmail_Public_Functions
    * @{
    * @brief  This file is used to manage Email (stored or loaded in tag)
    */ 
  
  /**
    * @brief  This function write the text in the TAG.
    * @param  text : text to write.
    * @retval NDEF_OK : NDEF file data written in the tag.
    * @retval NDEF_ERROR : not able to store NDEF in tag.
    * @retval NDEF_ERROR_MEMORY_INTERNAL : Cannot write to tag.
    * @retval NDEF_ERROR_NOT_FORMATED : CCFile data not supported or not present.
    * @retval NDEF_ERROR_MEMORY_TAG : Size not compatible with memory.
    * @retval NDEF_ERROR_LOCKED : Tag locked, cannot be write.
    */
  uint16_t NDEF_WriteText( char *text )
  {
    uint16_t status = NDEF_ERROR;
    uint32_t textSize, Offset = 0;
  
   
    /* TEXT : 1+en+message */
    textSize = 3 + strlen(text);
  
    /* TEXT header */
    NDEF_Buffer[Offset] = 0xD1;
    if( textSize < 256 ) NDEF_Buffer[Offset] |= 0x10;                   // Set the SR bit
    Offset++;
  
    NDEF_Buffer[Offset++] = TEXT_TYPE_STRING_LENGTH;
    if( textSize > 255 )
    {
      NDEF_Buffer[Offset++] = (textSize & 0xFF000000) >> 24;
      NDEF_Buffer[Offset++] = (textSize & 0x00FF0000) >> 16;
      NDEF_Buffer[Offset++] = (textSize & 0x0000FF00) >> 8;
      NDEF_Buffer[Offset++] = textSize & 0x000000FF;
    }
    else
    {
      NDEF_Buffer[Offset++] = (uint8_t)textSize;
    }
    memcpy( &NDEF_Buffer[Offset], TEXT_TYPE_STRING, TEXT_TYPE_STRING_LENGTH );
    Offset += TEXT_TYPE_STRING_LENGTH;
  
    /* TEXT payload */
    NDEF_Buffer[Offset++] = ISO_ENGLISH_CODE_STRING_LENGTH;
    memcpy( &NDEF_Buffer[Offset], ISO_ENGLISH_CODE_STRING, ISO_ENGLISH_CODE_STRING_LENGTH );
    Offset += ISO_ENGLISH_CODE_STRING_LENGTH;
  
    memcpy( &NDEF_Buffer[Offset], text, strlen(text) );
    Offset += strlen(text);
  
    status = NfcTag_WriteNDEF( Offset , NDEF_Buffer );
  
    return status;
  }
  
  
  /**
    * @brief  This function the Text information in a record if any.
    * @param  pRecordStruct Pointer on a NDEF record structure.
    * @param  pText A pointer on a text information structure, used to return the text & its metadata.
    * @retval NDEF_OK                    Text information has been retrieved.
    * @retval NDEF_ERROR                 The record is not a Text record.
    * @retval NDEF_ERROR_MEMORY_INTERNAL Language code or Text length is too big for the buffers.
    */
  uint16_t NDEF_ReadText( sRecordInfo_t *pRecordStruct, NDEF_Text_info_t *pText )
  {
    uint16_t status = NDEF_ERROR;
  
    if( pRecordStruct->NDEF_Type == TEXT_TYPE )
    {
      /* Get the text metadata (status byte (encoding & language code length) + language code) */
      NDEF_Text_metadata_t *text_record_info = (NDEF_Text_metadata_t *)pRecordStruct->PayloadBufferAdd;
          
      uint32_t text_length = pRecordStruct->PayloadLength           /* record length */
                             - text_record_info->language_length    /* minus language code length */
                             - sizeof(uint8_t);                     /* minus the status byte length */
      
      if((text_record_info->language_length >= NDEF_TEXT_LANGUAGE_CODE_MAX_LENGTH) || 
          (text_length >= NDEF_TEXT_MAX_LENGTH))
      {
        /* One of the text info structure buffer is too small */
        return NDEF_ERROR_MEMORY_INTERNAL;
      }
      
      /* Retrieve the encoding */
      pText->encoding =  (NDEF_Text_encoding_t)text_record_info->encoding;
  
      /* Save the language code string (adding null char at the end) */
      memcpy(&pText->language_code,text_record_info->language,text_record_info->language_length);
      pText->language_code[text_record_info->language_length] = '\0';
      
      /* Copy the text string itself (adding null char at the end) */
      memcpy(&pText->text, text_record_info->language + text_record_info->language_length,text_length);
      pText->text[text_length] = '\0';
      
      status = NDEF_OK;
    }
    else 
    {
      /* Not a text record, exit in error */
      status = NDEF_ERROR;
    }
  
    return status;
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /******************* (C) COPYRIGHT 2015 STMicroelectronics *****END OF FILE****/
  