214 lines
10 KiB
C
214 lines
10 KiB
C
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/* Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
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This software may be distributed and modified under the terms of the GNU
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General Public License version 2 (GPL2) as published by the Free Software
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Foundation and appearing in the file GPL2.TXT included in the packaging of
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this file. Please note that GPL2 Section 2[b] requires that all works based
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on this software must also be made publicly available under the terms of
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the GPL2 ("Copyleft").
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Contact information
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-------------------
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Circuits At Home, LTD
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Web : http://www.circuitsathome.com
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e-mail : support@circuitsathome.com
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*/
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#if !defined(_usb_h_) || defined(__CONFDESCPARSER_H__)
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#error "Never include confdescparser.h directly; include Usb.h instead"
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#else
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#define __CONFDESCPARSER_H__
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class UsbConfigXtracter {
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public:
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//virtual void ConfigXtract(const USB_CONFIGURATION_DESCRIPTOR *conf) = 0;
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//virtual void InterfaceXtract(uint8_t conf, const USB_INTERFACE_DESCRIPTOR *iface) = 0;
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virtual void EndpointXtract(uint8_t conf, uint8_t iface, uint8_t alt, uint8_t proto, const USB_ENDPOINT_DESCRIPTOR *ep) {
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};
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};
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#define CP_MASK_COMPARE_CLASS 1
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#define CP_MASK_COMPARE_SUBCLASS 2
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#define CP_MASK_COMPARE_PROTOCOL 4
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#define CP_MASK_COMPARE_ALL 7
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// Configuration Descriptor Parser Class Template
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template <const uint8_t CLASS_ID, const uint8_t SUBCLASS_ID, const uint8_t PROTOCOL_ID, const uint8_t MASK>
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class ConfigDescParser : public USBReadParser {
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UsbConfigXtracter *theXtractor;
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MultiValueBuffer theBuffer;
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MultiByteValueParser valParser;
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ByteSkipper theSkipper;
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uint8_t varBuffer[16 /*sizeof(USB_CONFIGURATION_DESCRIPTOR)*/];
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uint8_t stateParseDescr; // ParseDescriptor state
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uint8_t dscrLen; // Descriptor length
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uint8_t dscrType; // Descriptor type
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bool isGoodInterface; // Apropriate interface flag
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uint8_t confValue; // Configuration value
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uint8_t protoValue; // Protocol value
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uint8_t ifaceNumber; // Interface number
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uint8_t ifaceAltSet; // Interface alternate settings
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bool UseOr;
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bool ParseDescriptor(uint8_t **pp, uint16_t *pcntdn);
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void PrintHidDescriptor(const USB_HID_DESCRIPTOR *pDesc);
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public:
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void SetOR(void) {
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UseOr = true;
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}
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ConfigDescParser(UsbConfigXtracter *xtractor);
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void Parse(const uint16_t len, const uint8_t *pbuf, const uint16_t &offset);
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};
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template <const uint8_t CLASS_ID, const uint8_t SUBCLASS_ID, const uint8_t PROTOCOL_ID, const uint8_t MASK>
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ConfigDescParser<CLASS_ID, SUBCLASS_ID, PROTOCOL_ID, MASK>::ConfigDescParser(UsbConfigXtracter *xtractor) :
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theXtractor(xtractor),
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stateParseDescr(0),
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dscrLen(0),
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dscrType(0),
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UseOr(false) {
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theBuffer.pValue = varBuffer;
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valParser.Initialize(&theBuffer);
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theSkipper.Initialize(&theBuffer);
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};
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template <const uint8_t CLASS_ID, const uint8_t SUBCLASS_ID, const uint8_t PROTOCOL_ID, const uint8_t MASK>
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void ConfigDescParser<CLASS_ID, SUBCLASS_ID, PROTOCOL_ID, MASK>::Parse(const uint16_t len, const uint8_t *pbuf, const uint16_t &offset) {
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uint16_t cntdn = (uint16_t)len;
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uint8_t *p = (uint8_t*)pbuf;
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while(cntdn)
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if(!ParseDescriptor(&p, &cntdn))
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return;
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}
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/* Parser for the configuration descriptor. Takes values for class, subclass, protocol fields in interface descriptor and
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compare masks for them. When the match is found, calls EndpointXtract passing buffer containing endpoint descriptor */
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template <const uint8_t CLASS_ID, const uint8_t SUBCLASS_ID, const uint8_t PROTOCOL_ID, const uint8_t MASK>
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bool ConfigDescParser<CLASS_ID, SUBCLASS_ID, PROTOCOL_ID, MASK>::ParseDescriptor(uint8_t **pp, uint16_t *pcntdn) {
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USB_CONFIGURATION_DESCRIPTOR* ucd = reinterpret_cast<USB_CONFIGURATION_DESCRIPTOR*>(varBuffer);
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USB_INTERFACE_DESCRIPTOR* uid = reinterpret_cast<USB_INTERFACE_DESCRIPTOR*>(varBuffer);
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switch(stateParseDescr) {
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case 0:
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theBuffer.valueSize = 2;
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valParser.Initialize(&theBuffer);
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stateParseDescr = 1;
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case 1:
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if(!valParser.Parse(pp, pcntdn))
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return false;
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dscrLen = *((uint8_t*)theBuffer.pValue);
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dscrType = *((uint8_t*)theBuffer.pValue + 1);
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stateParseDescr = 2;
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case 2:
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// This is a sort of hack. Assuming that two bytes are all ready in the buffer
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// the pointer is positioned two bytes ahead in order for the rest of descriptor
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// to be read right after the size and the type fields.
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// This should be used carefully. varBuffer should be used directly to handle data
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// in the buffer.
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theBuffer.pValue = varBuffer + 2;
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stateParseDescr = 3;
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case 3:
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switch(dscrType) {
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case USB_DESCRIPTOR_INTERFACE:
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isGoodInterface = false;
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case USB_DESCRIPTOR_CONFIGURATION:
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theBuffer.valueSize = sizeof (USB_CONFIGURATION_DESCRIPTOR) - 2;
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break;
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case USB_DESCRIPTOR_ENDPOINT:
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theBuffer.valueSize = sizeof (USB_ENDPOINT_DESCRIPTOR) - 2;
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break;
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case HID_DESCRIPTOR_HID:
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theBuffer.valueSize = dscrLen - 2;
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break;
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}
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valParser.Initialize(&theBuffer);
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stateParseDescr = 4;
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case 4:
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switch(dscrType) {
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case USB_DESCRIPTOR_CONFIGURATION:
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if(!valParser.Parse(pp, pcntdn))
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return false;
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confValue = ucd->bConfigurationValue;
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break;
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case USB_DESCRIPTOR_INTERFACE:
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if(!valParser.Parse(pp, pcntdn))
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return false;
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if((MASK & CP_MASK_COMPARE_CLASS) && uid->bInterfaceClass != CLASS_ID)
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break;
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if((MASK & CP_MASK_COMPARE_SUBCLASS) && uid->bInterfaceSubClass != SUBCLASS_ID)
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break;
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if(UseOr) {
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if((!((MASK & CP_MASK_COMPARE_PROTOCOL) && uid->bInterfaceProtocol)))
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break;
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} else {
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if((MASK & CP_MASK_COMPARE_PROTOCOL) && uid->bInterfaceProtocol != PROTOCOL_ID)
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break;
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}
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isGoodInterface = true;
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ifaceNumber = uid->bInterfaceNumber;
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ifaceAltSet = uid->bAlternateSetting;
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protoValue = uid->bInterfaceProtocol;
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break;
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case USB_DESCRIPTOR_ENDPOINT:
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if(!valParser.Parse(pp, pcntdn))
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return false;
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if(isGoodInterface)
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if(theXtractor)
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theXtractor->EndpointXtract(confValue, ifaceNumber, ifaceAltSet, protoValue, (USB_ENDPOINT_DESCRIPTOR*)varBuffer);
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break;
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//case HID_DESCRIPTOR_HID:
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// if (!valParser.Parse(pp, pcntdn))
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// return false;
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// PrintHidDescriptor((const USB_HID_DESCRIPTOR*)varBuffer);
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// break;
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default:
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if(!theSkipper.Skip(pp, pcntdn, dscrLen - 2))
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return false;
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}
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theBuffer.pValue = varBuffer;
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stateParseDescr = 0;
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}
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return true;
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}
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template <const uint8_t CLASS_ID, const uint8_t SUBCLASS_ID, const uint8_t PROTOCOL_ID, const uint8_t MASK>
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void ConfigDescParser<CLASS_ID, SUBCLASS_ID, PROTOCOL_ID, MASK>::PrintHidDescriptor(const USB_HID_DESCRIPTOR *pDesc) {
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Notify(PSTR("\r\n\r\nHID Descriptor:\r\n"), 0x80);
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Notify(PSTR("bDescLength:\t\t"), 0x80);
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PrintHex<uint8_t > (pDesc->bLength, 0x80);
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Notify(PSTR("\r\nbDescriptorType:\t"), 0x80);
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PrintHex<uint8_t > (pDesc->bDescriptorType, 0x80);
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Notify(PSTR("\r\nbcdHID:\t\t\t"), 0x80);
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PrintHex<uint16_t > (pDesc->bcdHID, 0x80);
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Notify(PSTR("\r\nbCountryCode:\t\t"), 0x80);
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PrintHex<uint8_t > (pDesc->bCountryCode, 0x80);
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Notify(PSTR("\r\nbNumDescriptors:\t"), 0x80);
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PrintHex<uint8_t > (pDesc->bNumDescriptors, 0x80);
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for(uint8_t i = 0; i < pDesc->bNumDescriptors; i++) {
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HID_CLASS_DESCRIPTOR_LEN_AND_TYPE *pLT = (HID_CLASS_DESCRIPTOR_LEN_AND_TYPE*)&(pDesc->bDescrType);
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Notify(PSTR("\r\nbDescrType:\t\t"), 0x80);
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PrintHex<uint8_t > (pLT[i].bDescrType, 0x80);
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Notify(PSTR("\r\nwDescriptorLength:\t"), 0x80);
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PrintHex<uint16_t > (pLT[i].wDescriptorLength, 0x80);
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}
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Notify(PSTR("\r\n"), 0x80);
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}
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#endif // __CONFDESCPARSER_H__
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