protocol/usb_hid/USB_Host_Shield_2.0/parsetools.cpp

   1 /* Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
   2
   3 This software may be distributed and modified under the terms of the GNU
   4 General Public License version 2 (GPL2) as published by the Free Software
   5 Foundation and appearing in the file GPL2.TXT included in the packaging of
   6 this file. Please note that GPL2 Section 2[b] requires that all works based
   7 on this software must also be made publicly available under the terms of
   8 the GPL2 ("Copyleft").
   9
  10 Contact information
  11 -------------------
  12
  13 Circuits At Home, LTD
  14 Web      :  http://www.circuitsathome.com
  15 e-mail   :  support@circuitsathome.com
  16  */
  17 #include "Usb.h"
  18
  19 bool MultiByteValueParser::Parse(uint8_t **pp, uint16_t *pcntdn) {
  20         if(!pBuf) {
  21                 Notify(PSTR("Buffer pointer is NULL!\r\n"), 0x80);
  22                 return false;
  23         }
  24         for(; countDown && (*pcntdn); countDown--, (*pcntdn)--, (*pp)++)
  25                 pBuf[valueSize - countDown] = (**pp);
  26
  27         if(countDown)
  28                 return false;
  29
  30         countDown = valueSize;
  31         return true;
  32 }
  33
  34 bool PTPListParser::Parse(uint8_t **pp, uint16_t *pcntdn, PTP_ARRAY_EL_FUNC pf, const void *me) {
  35         switch(nStage) {
  36                 case 0:
  37                         pBuf->valueSize = lenSize;
  38                         theParser.Initialize(pBuf);
  39                         nStage = 1;
  40
  41                 case 1:
  42                         if(!theParser.Parse(pp, pcntdn))
  43                                 return false;
  44
  45                         arLen = 0;
  46                         arLen = (pBuf->valueSize >= 4) ? *((uint32_t*)pBuf->pValue) : (uint32_t)(*((uint16_t*)pBuf->pValue));
  47                         arLenCntdn = arLen;
  48                         nStage = 2;
  49
  50                 case 2:
  51                         pBuf->valueSize = valSize;
  52                         theParser.Initialize(pBuf);
  53                         nStage = 3;
  54
  55                 case 3:
  56                         for(; arLenCntdn; arLenCntdn--) {
  57                                 if(!theParser.Parse(pp, pcntdn))
  58                                         return false;
  59
  60                                 if(pf)
  61                                         pf(pBuf, (arLen - arLenCntdn), me);
  62                         }
  63
  64                         nStage = 0;
  65         }
  66         return true;
  67 }