UbxBuffer Class Reference

Brief description of class still missing. More...

#include <UbxBuffer.h>

Inheritance diagram for UbxBuffer:

List of all members.

Public Member Functions
void	startBroadcast ()
	UbxBuffer (int fd, GpsServer *server, UbxDevice *device)
	~UbxBuffer ()
Protected Member Functions
virtual int	bytesAvailable (char *buffer, int byteCount)

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Detailed Description

Brief description of class still missing.

Full description of class still missing

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Constructor & Destructor Documentation

UbxBuffer::UbxBuffer	(	int	fd,
		GpsServer *	server,
		UbxDevice *	device
	)

Description of constructor still missing

References TRACE.

    : DynamicBuffer(fd)
{
  TRACE;
  _oldFix=new GpsFix;
  _newFix=new GpsFix;
  _server=server;
  _index=0;
  _device=device;
}

UbxBuffer::~UbxBuffer

(

)

Description of destructor still missing

References TRACE.

{
  TRACE;
  delete _oldFix;
  delete _newFix;
}

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Member Function Documentation

int UbxBuffer::bytesAvailable	(	char *	buffer,
		int	byteCount
	)		[protected, virtual]

Returns the number of accepted bytes.

Implements GpCoreTools::DynamicBuffer.

References GpCoreTools::DynamicBuffer::debugBuffer(), GpCoreTools::DynamicBuffer::debugIgnoreByte(), GpCoreTools::MessageClassIdHeader::isValid(), GpCoreTools::MessageClassIdHeader::lengthLittleEndian(), GpCoreTools::MessageClassIdHeader::messageClass, GpCoreTools::MessageClassIdHeader::messageId, GpCoreTools::DynamicBuffer::read(), and TRACE.

{
  TRACE;
  // If less bytes are available, just wait for more data.
  int readBytes=MessageClassIdHeader::SynchronizationSize+
                MessageClassIdHeader::HeaderSize+
                MessageClassIdHeader::CheckSumSize;
  if(byteCount<readBytes) {
    return 0;
  }
  // Expects that the buffer begins with the U-Blox packet tag 0xB5 0x62
  // If there are some garbage at the beginning scan for the first
  // match of the tag (try to synchronize)
  MessageClassIdHeader * hdr=reinterpret_cast<MessageClassIdHeader *>(buffer);
  if(!hdr->isValid()) {
    return 1;
  }
  unsigned short length=hdr->lengthLittleEndian();
  readBytes+=length;
  if(byteCount<readBytes) {
    return 0;
  }
  buffer+=MessageClassIdHeader::SynchronizationSize+MessageClassIdHeader::HeaderSize;
  char * payload=buffer;
  buffer+=length;
  if(hdr->isValid(*reinterpret_cast<const FletcherChecksum *>(buffer), payload, length)) {
    read(*hdr, payload, length);
  } else {
    Log::write(0, "[ERROR] received block class 0x%02hhX id 0x%02hhX with bad checksum\n", hdr->messageClass(), hdr->messageId());
    debugBuffer();
    // Instead of skipping completely the corrupted block, scan it byte per byte to find 0xB5 0x62
    debugIgnoreByte();
    return 1;
  }
  return readBytes;
}

void UbxBuffer::startBroadcast

(

)

References WaranCore::GpsFix::reset(), and TRACE.

{
  TRACE;
  _oldFix->reset();
  _index=0;
}

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The documentation for this class was generated from the following files:

• warangpsd/UbxBuffer.h
• warangpsd/UbxBuffer.cpp