gecko-dev/dom/bluetooth/common/ObexBase.cpp

197 строки
4.8 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ObexBase.h"
BEGIN_BLUETOOTH_NAMESPACE
//
// Internal functions
//
/**
* Append byte array and length to header
*/
int
AppendHeader(uint8_t aHeaderId, uint8_t* aRetBuf, int aBufferSize,
const uint8_t* aData, int aLength)
{
int headerLength = aLength + 3;
int writtenLength = (headerLength < aBufferSize) ? headerLength : aBufferSize;
aRetBuf[0] = aHeaderId;
BigEndian::writeUint16(&aRetBuf[1], headerLength);
memcpy(&aRetBuf[3], aData, writtenLength - 3);
return writtenLength;
}
/**
* Append 4-byte integer to header
*/
int
AppendHeader(uint8_t aHeaderId, uint8_t* aRetBuf, int aValue)
{
aRetBuf[0] = aHeaderId;
BigEndian::writeInt32(&aRetBuf[1], aValue);
return 5;
}
//
// Exposed functions
//
int
AppendHeaderName(uint8_t* aRetBuf, int aBufferSize, const uint8_t* aName,
int aLength)
{
return AppendHeader(ObexHeaderId::Name, aRetBuf, aBufferSize,
aName, aLength);
}
int
AppendHeaderBody(uint8_t* aRetBuf, int aBufferSize, const uint8_t* aBody,
int aLength)
{
return AppendHeader(ObexHeaderId::Body, aRetBuf, aBufferSize,
aBody, aLength);
}
int
AppendHeaderTarget(uint8_t* aRetBuf, int aBufferSize, const uint8_t* aTarget,
int aLength)
{
return AppendHeader(ObexHeaderId::Target, aRetBuf, aBufferSize,
aTarget, aLength);
}
int
AppendHeaderWho(uint8_t* aRetBuf, int aBufferSize, const uint8_t* aWho,
int aLength)
{
return AppendHeader(ObexHeaderId::Who, aRetBuf, aBufferSize,
aWho, aLength);
}
int
AppendAuthResponse(uint8_t* aRetBuf, int aBufferSize, const uint8_t* aDigest,
int aLength)
{
return AppendHeader(ObexHeaderId::AuthResponse, aRetBuf, aBufferSize,
aDigest, aLength);
}
int
AppendHeaderAppParameters(uint8_t* aRetBuf, int aBufferSize,
const uint8_t* aAppParameters, int aLength)
{
return AppendHeader(ObexHeaderId::AppParameters, aRetBuf, aBufferSize,
aAppParameters, aLength);
}
int
AppendAppParameter(uint8_t* aRetBuf, int aBufferSize, const uint8_t aTagId,
const uint8_t* aValue, int aLength)
{
// An application parameter is a [tag]-[length]-[value] triplet. The [tag] and
// [length] fields are 1-byte length each.
if (aBufferSize < aLength + 2) {
// aBufferSize should be larger than size of AppParameter + header.
BT_WARNING("Return buffer size is too small for the AppParameter");
return 0;
}
aRetBuf[0] = aTagId;
aRetBuf[1] = aLength;
memcpy(&aRetBuf[2], aValue, aLength);
return aLength + 2;
}
int
AppendHeaderLength(uint8_t* aRetBuf, int aObjectLength)
{
return AppendHeader(ObexHeaderId::Length, aRetBuf, aObjectLength);
}
int
AppendHeaderConnectionId(uint8_t* aRetBuf, int aConnectionId)
{
return AppendHeader(ObexHeaderId::ConnectionId, aRetBuf, aConnectionId);
}
int
AppendHeaderEndOfBody(uint8_t* aRetBuf)
{
aRetBuf[0] = ObexHeaderId::EndOfBody;
aRetBuf[1] = 0x00;
aRetBuf[2] = 0x03;
return 3;
}
void
SetObexPacketInfo(uint8_t* aRetBuf, uint8_t aOpcode, int aPacketLength)
{
aRetBuf[0] = aOpcode;
BigEndian::writeUint16(&aRetBuf[1], aPacketLength);
}
bool
ParseHeaders(const uint8_t* aHeaderStart,
int aTotalLength,
ObexHeaderSet* aRetHandlerSet)
{
const uint8_t* ptr = aHeaderStart;
while (ptr - aHeaderStart < aTotalLength) {
ObexHeaderId headerId = (ObexHeaderId)*ptr++;
uint16_t contentLength = 0;
// Defined in 2.1 OBEX Headers, IrOBEX 1.2
switch (headerId >> 6)
{
case 0x00:
// Null-terminated Unicode text, length prefixed with 2-byte
// unsigned integer.
case 0x01:
// byte sequence, length prefixed with 2 byte unsigned integer.
contentLength = BigEndian::readUint16(ptr) - 3;
ptr += 2;
break;
case 0x02:
// 1 byte quantity
contentLength = 1;
break;
case 0x03:
// 4 byte quantity
contentLength = 4;
break;
}
// Length check to prevent from memory pollution.
if (ptr + contentLength > aHeaderStart + aTotalLength) {
// Severe error occurred. We can't even believe the received data, so
// clear all headers.
MOZ_ASSERT(false);
aRetHandlerSet->ClearHeaders();
return false;
}
aRetHandlerSet->AddHeader(new ObexHeader(headerId, contentLength, ptr));
ptr += contentLength;
}
return true;
}
END_BLUETOOTH_NAMESPACE