diff -r 000000000000 -r 8e480a14352b messagingfw/wappushfw/pushutils/src/chttpresponse.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/messagingfw/wappushfw/pushutils/src/chttpresponse.cpp Mon Jan 18 20:36:02 2010 +0200 @@ -0,0 +1,1312 @@ +// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies). +// All rights reserved. +// This component and the accompanying materials are made available +// under the terms of "Eclipse Public License v1.0" +// which accompanies this distribution, and is available +// at the URL "http://www.eclipse.org/legal/epl-v10.html". +// +// Initial Contributors: +// Nokia Corporation - initial contribution. +// +// Contributors: +// +// Description: +// Purpose: This file provides the definition of the CHTTPResponse class. +// The HTTP Response class encodes HTTP response headers only. It +// contains the methods used to transcode from WSP->HTTP fields +// Local includes +// +// + + + +// System includes +// +#include + +// User includes +#include "chttpresponse.h" + +const TUint8 KWapQuote = 0x7F; +const TUint8 KTop3BitSet = 0x70; +const TUint8 KCarryBitMask = 0x80; + +// Default MIME type is text/plain if we can't identify any other +// +static const TText8* const defaultType = _S8("application/octet-stream"); + +// Implementation of CHTTPResponse class +// + + +// Factory method to construct this class. +// +// Rtn: a new CHTTPResponse object, by ptr. Ownership is transferred to the +// caller. +// + +CHTTPResponse* CHTTPResponse::NewL() + { + CHTTPResponse* me = new(ELeave)CHTTPResponse(); + CleanupStack::PushL(me); + me->ConstructL(); + CleanupStack::Pop(); + return me; + } + + +// Destructor for this class. Removes this object and releases memory held +// by it +// + +CHTTPResponse::~CHTTPResponse() + { + Reset(); + //__CLOSE_LOG; + } + + +// Clean out the fields buffer +// + +void CHTTPResponse::Reset() + { + //__LOG_ENTER(_L("CHTTPResponse::Reset")); + delete iResponse; + iResponse = NULL; + //__LOG_RETURN; + } + + +// Set the fields buffer with the response received from the WAP Stack +// +// In: +// aResponse - an 8-bit descriptor field containing the origin server's +// WSP-encoded response header. Ownership is transferred to +// this class. +// + +void CHTTPResponse::AddResponse(HBufC8* aResponse) + { + //__LOG_ENTER(_L("CHTTPResponse::AddResponse")); + delete iResponse; + iResponse = aResponse; +#ifdef _DEBUG + DumpToLog(*aResponse); +#endif + //__LOG_RETURN; + } + + +// Accessor to the HTTP response fields buffer +// +// Rtn: a reference to the response. Ownership is _NOT_ transferred +// +// NOTE THIS SHOULD RETURN CONST - BUT CAN'T BE CHANGED SINCE IT WOULD +// BREAK BC. + +HBufC8& CHTTPResponse::Response() const + { + //__LOG_ENTER(_L("CHTTPResponse::Response")); + //__LOG_RETURN; + return *iResponse; + } + + +// Accessor to the HTTP status code (e.g. 400, 300, 200, 500) +// +// Rtn: the status code - series number only. +// + +THttpStatusCode CHTTPResponse::StatusCode() const + { + //__LOG_ENTER(_L("CHTTPResponse::StatusCode")); + //__LOG_RETURN; + return iStatusCode; + } + + +// Accessor to the HTTP detailed status code (e.g. 404, 304, 200, 501) +// +// Rtn: the status code - series and specific code value +// + +THttpStatusCode CHTTPResponse::DetailedStatusCode() const + { + //__LOG_ENTER(_L("CHTTPResponse::DetailedStatusCode")); + //__LOG_RETURN; + return iDetailedStatusCode; + } + + +// Accessor to set the HTTP response status. +// +// In: +// aCode - the WSP-encoded status code +// + +void CHTTPResponse::SetStatusCode(TInt aCode) + { +// __LOG_ENTER(_L("CHTTPResponse::SetStatusCode")); +// __LOG1(_L("CHTTPResponse::SetStatusCode : 'aCode' = %d"), aCode); + + // Set iDetailedStatusCode to a default + iDetailedStatusCode = EHttpUnknown; + + // Magic no.s come from the WAP WSP specification, Appendix A, Table 36 + switch (aCode) + { + case 0x10: + iStatusCode = EHttpContinue; + break; + case 0x11: + iDetailedStatusCode = EHttpSwitchingProtocols; + iStatusCode = EHttpContinue; + break; + + case 0x20: + iStatusCode = EHttpOK; + break; + case 0x21: + iDetailedStatusCode = EHttpCreated; + iStatusCode = EHttpOK; + break; + case 0x22: + iDetailedStatusCode = EHttpAccepted; + iStatusCode = EHttpOK; + break; + case 0x23: + iDetailedStatusCode = EHttpNonAuthorativeInformation; + iStatusCode = EHttpOK; + break; + case 0x24: + iDetailedStatusCode = EHttpNoContent; + iStatusCode = EHttpOK; + break; + case 0x25: + iDetailedStatusCode = EHttpResetContent; + iStatusCode = EHttpOK; + break; + case 0x26: + iDetailedStatusCode = EHttpPartialContent; + iStatusCode = EHttpOK; + break; + + case 0x30: + iStatusCode = EHttpMultipleChoices; + break; + case 0x31: + iDetailedStatusCode = EHttpMovedPermanently; + iStatusCode = EHttpMultipleChoices; + break; + case 0x32: + iDetailedStatusCode = EHttpMovedTemporarily; + iStatusCode = EHttpMultipleChoices; + break; + case 0x33: + iDetailedStatusCode = EHttpSeeOther; + iStatusCode = EHttpMultipleChoices; + break; + case 0x34: + iDetailedStatusCode = EHttpNotModified; + iStatusCode = EHttpMultipleChoices; + break; + case 0x35: + iDetailedStatusCode = EHttpUseProxy; + iStatusCode = EHttpMultipleChoices; + break; + + case 0x40: + iStatusCode = EHttpBadRequest; + break; + case 0x41: + iDetailedStatusCode = EHttpUnauthorized; + iStatusCode = EHttpBadRequest; + break; + case 0x42: + iDetailedStatusCode = EHttpPaymentRequired; + iStatusCode = EHttpBadRequest; + break; + case 0x43: + iDetailedStatusCode = EHttpForbidden; + iStatusCode = EHttpBadRequest; + break; + case 0x44: + iDetailedStatusCode = EHttpNotFound; + iStatusCode = EHttpBadRequest; + break; + case 0x45: + iDetailedStatusCode = EHttpMethodNotAllowed; + iStatusCode = EHttpBadRequest; + break; + case 0x46: + iDetailedStatusCode = EHttpNotAcceptable; + iStatusCode = EHttpBadRequest; + break; + case 0x47: + iDetailedStatusCode = EHttpProxyAuthenticationRequired; + iStatusCode = EHttpBadRequest; + break; + case 0x48: + iDetailedStatusCode = EHttpRequestTimeout; + iStatusCode = EHttpBadRequest; + break; + case 0x49: + iDetailedStatusCode = EHttpConflict; + iStatusCode = EHttpBadRequest; + break; + case 0x4a: + iDetailedStatusCode = EHttpGone; + iStatusCode = EHttpBadRequest; + break; + case 0x4b: + iDetailedStatusCode = EHttpLengthRequired; + iStatusCode = EHttpBadRequest; + break; + case 0x4c: + iDetailedStatusCode = EHttpPreconditionFailed; + iStatusCode = EHttpBadRequest; + break; + case 0x4d: + iDetailedStatusCode = EHttpRequestEntityTooLarge; + iStatusCode = EHttpBadRequest; + break; + case 0x4e: + iDetailedStatusCode = EHttpRequestURITooLong; + iStatusCode = EHttpBadRequest; + break; + case 0x4f: + iDetailedStatusCode = EHttpUnsupportedMediaType; + iStatusCode = EHttpBadRequest; + break; + + case 0x60: + iStatusCode = EHttpInternalServerError; + break; + case 0x61: + iDetailedStatusCode = EHttpNotImplemented; + iStatusCode = EHttpInternalServerError; + break; + case 0x62: + iDetailedStatusCode = EHttpBadGateway; + iStatusCode = EHttpInternalServerError; + break; + case 0x63: + iDetailedStatusCode = EHttpServiceUnavailable; + iStatusCode = EHttpInternalServerError; + break; + case 0x64: + iDetailedStatusCode = EHttpGatewayTimeout; + iStatusCode = EHttpInternalServerError; + break; + case 0x65: + iDetailedStatusCode = EHttpHTTPVersionNotSupported; + iStatusCode = EHttpInternalServerError; + break; + + default: + iStatusCode = EHttpUnknown; + break; + } + if (iDetailedStatusCode == EHttpUnknown) + iDetailedStatusCode = iStatusCode; +// __LOG1(_L("CHTTPResponse::SetStatusCode : status code = %d"), iStatusCode); +// __LOG1(_L("CHTTPResponse::SetStatusCode : detailed status code = %d"), iDetailedStatusCode); +// __LOG_RETURN; + } + + +// Method to find a named field, that returns null terminated +// WSP text strings. Note that there is no checking that it is a text string +// which follows. +// +// In: +// aField - the field type +// aStartIndex - the index to search from (defaults to the buffer start) +// +// Out: +// aDesc - a pointer-type descriptor into the response buffer at the +// position where the field was located. The caller must NOT +// modify the descriptor contents +// +// Rtn: TBool - set to ETrue if the field was found, EFalse otherwise +// + +TBool CHTTPResponse::FindField(THttpHeaderField aField, + TPtrC8& aDesc, + TInt aStartIndex) const + { +// __LOG_ENTER(_L("CHTTPResponse::FindField (string)")); +// __LOG1(_L("CHTTPResponse::FindField : searching for field type = %d"), aField); + TInt index = LocateField(aField, aStartIndex); + if (index >0) + { + TInt count = 0; + for (count = index; (count < iResponse->Length()) && + (iResponse->Des()[count] != 0); count++) {}; + if (count <= iResponse->Length()) + { + aDesc.Set(&(iResponse->Des()[index]), count-index); +// __LOG(_L("CHTTPResponse::FindField : found string:")); +#ifdef _DEBUG + DumpToLog(aDesc); +#endif +// __LOG_RETURN; + return ETrue; + } + } +// __LOG(_L("CHTTPResponse::FindField : nothing found")); +// __LOG_RETURN; + return EFalse; + } + + +// Method to find a named field, that returns 8-bit octet data (binary +// or strings - not stipulated which). +// +// In: +// aField - the field type +// aStartIndex - the index to search from (defaults to the buffer start) +// +// Out: +// aDesc - a pointer-type descriptor into the response buffer at the +// position where the field was located. The caller must NOT +// modify the descriptor contents +// +// Rtn: TBool - set to ETrue if the field was found, EFalse otherwise +// + +TBool CHTTPResponse::FindBinaryDescField(THttpHeaderField aField, + TPtrC8& aDesc, + TInt aStartIndex) const + { + TInt index = LocateField(aField, aStartIndex); + if (index >= 0) + { + TInt offset = 0; + TInt fieldLength = iResponse->Des()[index]; // assume the length is in + // a short integer + if(fieldLength == 31) + { + // Nope : Code 31 indicates that the following bytes make a + // UIntVar, which indicates the number of data octets after it. + // The UIntVar itself could be composed of upto 5 bytes + // Copy a full 5 bytes from the header + // Note that actually fewer might have been used; + // the UIntVar to Int converter function returns the exact number + // that were used. + TInt consumed = ParseUIntVar(iResponse->Des().Mid(index + 1), fieldLength); + + __ASSERT_DEBUG( consumed >= KErrNone, User::Invariant() ); + + offset += consumed; + } + else if (fieldLength > 127) + { + // Oops be sneaky and reuse this single byte + // Because this is a special code + fieldLength = 1; + offset = -1; + } + + if(fieldLength) + { + aDesc.Set(&(iResponse->Des()[index + offset + 1]), fieldLength); +#ifdef _DEBUG + DumpToLog(aDesc); +#endif + return ETrue; + } + } + return EFalse; + } + + +// Method to find a named field, that returns an EPOC date/time structure. +// +// In: +// aField - the field type +// aStartIndex - the index to search from (defaults to the buffer start) +// +// Out: +// aTime - a structure containing the time (and date) found in the header +// +// Rtn: TBool - set to ETrue if the field was found, EFalse otherwise +// + +TBool CHTTPResponse::FindField(THttpHeaderField aField, + TTime& aTime, + TInt aStartIndex) const + { + //__LOG_ENTER(_L("CHTTPResponse::FindField (time)")); + TBool result = EFalse; + TInt index = LocateField(aField, aStartIndex); + if (index > 0) + { + TPtr8 respChars = iResponse->Des(); + ExtractFieldDateValue(respChars,index,aTime); + result = ETrue; + } + //__LOG_RETURN; + return result; + } + + +// Method to find a named field within the Cache Control header +// +// In: +// aField - the field type +// +// Out: +// +// Rtn: TBool - set to ETrue if the field was found, EFalse otherwise +// + +TBool CHTTPResponse::FindCacheControlFieldValue(TCacheControlFieldValue aField) const + { + TPtrC8 cacheControl; + return FindCacheControlFieldValue(aField,cacheControl) != KErrNotFound; + } + + +// Method to find a named field within the Cache Control header, +// that returns an EPOC date/time structure. +// +// In: +// aField - the field type +// +// Out: +// aTime - a structure containing the time (and date) found in the header +// field +// +// Rtn: TBool - set to ETrue if the field was found, EFalse otherwise +// + +TBool CHTTPResponse::ExtractCacheControlTime(TCacheControlFieldValue aField, + TTime& aTime) const + { + //__LOG_ENTER(_L("CHTTPResponse::ExtractCacheControlTime")); + __ASSERT_DEBUG(aField == ECacheCtrlMaxAge || aField == ECacheCtrlMaxStale + || aField == ECacheCtrlMinFresh, User::Invariant()); + TBool result = EFalse; + TPtrC8 cacheControl; + aTime = 0; + TInt index = FindCacheControlFieldValue(aField, cacheControl); + if(index != KErrNotFound) + { + // Have the cache control and the field position + // Now we need to extract the field's delta-secs value + index++; + TInt time = 0; + TPtrC8 integerSource = cacheControl.Mid(index); + + if(integerSource[0] >= 0x80) // Short integer value + time = integerSource[0] & 0x7F; + else // Otherwise its multi octet + ExtractMultiOctetInteger(time, integerSource); + + TTimeIntervalSeconds timeSeconds(time); + aTime += timeSeconds; // Store the seconds in the time field + result = ETrue; + } + //__LOG_RETURN; + return result; + } + + +// Method to search for the content type encoded in the response header +// +// Out: +// aDesc - a pointer-type descriptor into the appropriate element of an +// array prefilled with all the content types that have WSP +// encodings. e.g. "text/vnd.wap.wml". The contents of the +// descriptor must NOT be modified. +// + +void CHTTPResponse::ContentType(TPtrC8& aDesc) const + { + // Decode the content-type data as per the WSP bnf... + // Note - There is no provision available here to handle content-type parameters + // so parameters are ignored here. + TInt error = LocateField(EHttpContentType); + TInt token = 0; + TBool isString = EFalse; + if (error != KErrNotFound) + { + TPtrC8 respChars(*iResponse); + TWspPrimitiveDecoder wspDecoder(respChars); + TWspPrimitiveDecoder::TWspHeaderType type = wspDecoder.VarType(); + switch(type) + { + case TWspPrimitiveDecoder::E7BitVal: + { + // 128-255 - encoded 7 bit value, this header has no more data + TUint8 byteCode = 0; + error = wspDecoder.Val7Bit(byteCode); // error code + token = static_cast(byteCode); + } break; + case TWspPrimitiveDecoder::EString: + { + // 32-127 - value is a text string, terminated by a '\0' + // Content type is embedded as a text string + error = wspDecoder.String(aDesc); // error code + isString = ETrue; + } break; + case TWspPrimitiveDecoder::ELengthVal: + { + // 0-31 - octet is a value length + TInt dataLength = 0; + error = wspDecoder.LengthVal(dataLength); + if( error >= KErrNone ) + { + type = wspDecoder.VarType(); + if( type == TWspPrimitiveDecoder::E7BitVal || type == TWspPrimitiveDecoder::ELengthVal ) + { + TUint32 contentTypeToken = 0; + error = wspDecoder.Integer(contentTypeToken); + token = static_cast(contentTypeToken); + } + else if( type == TWspPrimitiveDecoder::EString ) + { + error = wspDecoder.String(aDesc); + isString = ETrue; + } + } + + } break; + default: + { + error = KErrNotFound; + } break; + } + } + + if(error < KErrNone) + token = KErrNotFound; + + // Look up the appropriate content type, provided an error hasn't occurred or the string + // has not already been set + if (token == KErrNotFound || !isString) + { + // Convert the content type string to the supplied descriptor + const TText8* type = ContentType(token); + aDesc.Set(TPtrC8(type)); +// __LOG1(_L("CHTTPResponse::ContentType : contentIndex = %d"), contentIndex); + } + + } + + +// Method to search for the realm encoded in the response header, when the +// response challenges the client for HTTP authentication (code 401) +// +// Out: +// aDesc - a pointer-type descriptor into the response header buffer +// positioned at the realm string within the challenge. The +// contents of the descriptor must NOT be modified. +// +// Rtn: TBool - set to ETrue if a WWWAuthenticate header was found, EFalse +// otherwise +// + +TBool CHTTPResponse::FindRealm(TPtrC8& aRealm) const + { + //__LOG_ENTER(_L("CHTTPResponse::FindRealm")); + // Search for the WWWAuthenticate field + TPtrC8 realmPtr(aRealm); + TBool retVal = FindField(EHttpWWWAuthenticate, realmPtr, 0); + if (retVal) + { + // realmPtr now points to the WWWAuthentication field value. This contains the Authentication scheme, realm + // value and optional parameters. Check authentication is Basic (encoded as 0x80). This is stored in the + // second byte of the header value (i.e. index [1]). + if (realmPtr[1] == 0x80) + { + // Set the realm descriptor passed in + aRealm.Set(realmPtr.Mid(2)); +#ifdef _DEBUG + // In debug builds, convert the 8-bit realm to 16-bit UNICODE in order to log it. + HBufC16* aRealm16 = HBufC16::New(aRealm.Length()); + if(aRealm16!=NULL) + { + TPtr16 aRealm16_Ptr = aRealm16->Des(); + aRealm16_Ptr.Copy(aRealm); + //__LOG1(_L("CHTTPResponse::FindRealm : found realm string: %S"), &aRealm16_Ptr); + delete aRealm16; + } +#endif + } + else + { + //__LOG(_L("CHTTPResponse::FindRealm : nothing found")); + retVal = EFalse; + } + } + //__LOG_RETURN; + return retVal; + } + + +// Method to search for the character set encoded in the Content-Type field of +// the response header +// +// Out: +// aDesc - a pointer-type descriptor into the appropriate element of an +// array prefilled with all the character sets that have WSP +// encodings. e.g. "utf-8". The contents of the descriptor must +// NOT be modified. +// +// Rtn: TBool - set to ETrue if a character set was found, EFalse if not +// + +TBool CHTTPResponse::CharSet(TPtrC8& aDesc) const + { +// __LOG_ENTER(_L("CHTTPResponse::CharSet")); + // Find the byte index in the header for the content type value + TInt index = LocateField(EHttpContentType); + + TUint8 byteCode = 0; + TInt paramByteCode = KErrNotFound; + TInt valueByteCode1 = KErrNotFound; + TInt charsetCode = 0; + // Read the byte code, unless KErrNotFound was returned + if (index != KErrNotFound) + { + TPtr8 respChars = iResponse->Des(); + TInt respLength = iResponse->Length(); + + // If the byteCode is in the range 0-30 then a range of bytes is + // indicated: the following byte gives the content type and the + // remainder are arranged as a series of parameter attribute-value + // pairs. This method checks for the presence of a 'charset' parameter. + byteCode = respChars[index]; +// __LOG1(_L("CHTTPResponse::CharSet : found bytecode = %d"), byteCode); + + // Check valid range ... note that a range of zero could not contain a charset + // parameter anyway, so exclude it... + if ((byteCode > 0) && (byteCode <= 30)) + { + // Check for overrun... if this occurs it should be an error. Note that + // corruption _could_ occur in this response buffer - some gateways, which + // don't return error decks (e.g. AnyTime GW) send a response buffer 1 byte + // long, containing only the value 0x01 - which is invalid WSP. + // Be conservative and safe here - we can't overrun. Use the value of byte- + // -Code (which should be the WSP encoding of how many bytes follow), or the + // total length of the response - whichever is smaller. + if (index + byteCode < respLength) + { + // e,g, header to illustrate use of offsets in this code: + // 03 94 81 84 : Content-Type: application/vnd.wap.wmlc; charset=iso-8859-1 + // +0 +1 +2 +3 : 03 = no. bytes in Content-Type header + // : 94 = 14 | 80 = application/vnd.wap.wmlc + // : 81 = 01 | 80 = Charset parameter + // : 84 = 04 | 80 = iso-8859-1 + paramByteCode = respChars[index + 2]; + + if ((paramByteCode & 0x7f) == EHttpCharset) + { + // We have a charset + paramByteCode &= 0x7f; + valueByteCode1 = respChars[index + 3]; + + if (valueByteCode1 & 0x80) + { + // A short one-byte value + charsetCode = valueByteCode1 & 0x7f; + } + else + { + // A multibyte value + ExtractMultiOctetInteger(charsetCode, + respChars.Mid(index + 3)); + } + } + } + else + { + index = KErrNotFound; + } + } + } + + // If a parameter-value pair was found, determine whether it encodes a + // charset + if ( (index != KErrNotFound) && (paramByteCode == EHttpCharset) ) + { + // Look up the value from the charset table. + const TText8* chset; + chset = CharSet(charsetCode); + + // Convert the charset string to the supplied descriptor + if (chset) + aDesc.Set(TPtrC8(chset)); + else + index = KErrNotFound; // We've found a charset but we don't recognise it + } + else // Either no content-type header (hence no charset) or a content-type + // header with a parameter other than charset + { + index = KErrNotFound; + } + +// __LOG1(_L("CHTTPResponse::CharSet : CharSet = %S"), &aDesc); +// __LOG_RETURN; + return (index !=KErrNotFound); + } + + +// Normal constructor - do non-allocating creation of this class +// + +CHTTPResponse::CHTTPResponse() + : iStatusCode(EHttpUnknown), iDetailedStatusCode(EHttpUnknown) + { + // Does nothing here + } + + +// Second phase construction - any allocation for this class must take place +// here. Sets up the resources required by an HTTP Response. +// + +void CHTTPResponse::ConstructL() + { + // Does nothing + //__OPEN_LOG(__LOG_WAP_FILE_NAME); + } + + +// Method to locate a named field in the response header, starting at the +// specified index position. +// +// In: +// aField - the header field type +// aStartIndex - the (optional) position in the header to start searching +// +// Rtn: TInt - the index position of the required field _value_ (not the +// field name), or KErrNotFound otherwise. +// + +TInt CHTTPResponse::LocateField(THttpHeaderField aField, + TInt aStartIndex) const + { + // Content-Type is a special case; it appears to always be at the first + // byte of the header, and doesn't have any encoding of the field name - + // just straight into the Field Value at byte 0. This is an assumption + // however, since the WSP spec is not explicit - could it possibly be just + // the NWSS GW's implementation of WSP that does this? + if ( (aStartIndex == 0) && (aField == EHttpContentType) ) + { + return aStartIndex; // the content-type field value position - ie. 0 + } + + // Deal with other Field Names, (Possibly including Content-Type if the + // start index is offset into the header? Note that this is not likely to + // occur though, with the abbreviated encoding.) + TInt respLength = iResponse->Length(); + TPtr8 respChars = iResponse->Des(); + for (TInt index = aStartIndex; index < respLength; index++) + { + // Examine the byte at this position in the header + TUint8 byteCode = respChars[index]; + + // Expect byteCode to be a Field Name code (unless the search is at + // position zero, which has a missing content-type field name). Check + // for the search field, remembering to clear the top bit + if ( ( (byteCode & 0x7f) == aField) && (index != 0) ) + { + // Got it - return the next position to locate the field value, + // checking for potential overrun + if (index < respLength - 1) + { + // Advance 1 to the header field value + ++index; + return index; + } + else + { + return KErrNotFound; + } + } + else + { + // Check that we aren't dealing with the Content-Type field + // (expected at position 0), since it doesn't use a field type + if (index != 0) + { + // WSP Spec Section 8.4.1.1 - Field Names + // + // If the byte is an alphanumeric, then it must be a field name that doesn't have + // a WSP encoding. In this circumstance, we can't handle the field, and must + // therefore skip over it + if ((byteCode >= 32) && (byteCode <= 127)) + { + // Hit the start of a Header Name string - this will be assumed + // continuous until the NUL is found or until the end + // of the header is hit (which would be an error) + while ( (respChars[index] != 0) && (index < respLength - 1) ) + ++index; + } + + // WSP Spec Section 8.4.1.2 - Field Values + // + // Now examine the field value by advancing one place. If that advance takes us off + // the end of the buffer, then (a) the WSP is invalid, and (b) the field is not found! + ++index; + if (index == respLength) + return KErrNotFound; + } + + // Read the next byte at this position in the header + byteCode = respChars[index]; + + // Codes 0-30 represent that number of following data octets, so + // they should be skipped + if (byteCode == 0) // 0 data octets follow !???? : (Strange but true) + { + // __DEBUGGER(); + } + else if (byteCode <= 30) + { + index += byteCode; + } + else + { + // Code 31 indicates that the following bytes make a UIntVar, + // which indicates the number of data octets after it. The + // UIntVar itself could be composed of upto 5 bytes + if (byteCode == 31) + { + // Copy a full 5 bytes from the header - note that actually + // fewer might have been used; the UIntVar to Int + // converter function returns the exact number that were + // used. + TInt value = 0; + TInt consumed = ParseUIntVar(respChars.Mid(index + 1), value); + + if( consumed < KErrNone ) + return KErrCorrupt; + + // Advance to the last byte of data in this header + index += consumed + value; + } + else + // Codes 32-127 are alphanumerics representing a text + // string, up to a NUL termination + if (byteCode <= 127) + // Hit the start of a string - this will be assumed + // continuous until the NUL is found or until the end + // of the header is hit (which would be an error) + while ( (respChars[index] != 0) && (index < respLength - 1) ) + ++index; + } + } + } + + // This return only occurs if the search ran off the end of the header + return KErrNotFound; + } + + +// Perform a look-up of content type given a WSP encoding value, used as +// an index. +// +// In: +// aIndex - the WSP encoding value +// +// Rtn: const TText* - the required content type text - NOT to be changed +// + +const TText8* CHTTPResponse::ContentType(TInt aContentTypeCode) const + { + + if ((aContentTypeCode >= 0) && (aContentTypeCode < KHttpNumContentTypes)) + return KHttpContentTypes[aContentTypeCode]; + else + return defaultType; + } + + +// Perform a look-up of character set given a WSP encoding value, used as +// an index. +// +// In: +// aCharsetCode - the index into the content types table/ +// +// Rtn: const TText8* - the required 8-bit character set text - NOT to be +// changed by the caller +// + +const TText8* CHTTPResponse::CharSet(TInt aCharSetCode) const + { + // Search for an index for the supplied charset code + TInt charSetIdx = KErrNotFound; + for (TInt index = 0; ((index < KHttpNumCharacterSets) && + (charSetIdx == KErrNotFound)); index++) + { + if (KHttpCharacterSetCodes[index] == aCharSetCode) + { + charSetIdx = index; + } + } + + // If something was found, return the corresponding charset name + if (charSetIdx != KErrNotFound) + return KHttpCharacterSetNames[charSetIdx]; + else + return NULL; + } + + +// Do a conversion from 32-bit UIntVar encoding into 32-bit integer +// +TInt CHTTPResponse::ParseUIntVar(const TDesC8& aBuffer, TInt& aVal) const + { + // Is there any buffer? + const TInt length = aBuffer.Length(); + if( length == 0 ) + return KErrCorrupt; + + // initialize return val + aVal = 0; + + // maximum length for a uintvar is 5 + TInt lenLeft = Min(length, 5); + + // get the first octet + TInt index = 0; + TUint8 byte = aBuffer[index++]; + TInt numBytes = 1; + + --lenLeft; + + // Check if any of the top 3 bits, ignoring the very top 'continue' bit, are set. + // Later if we see that this is a 5 byte number - we'll know it is corrupt. + // Encoding uses 7 bits/number 7x5=35 and we only support a maxiumum number + // of 32 bits. + TBool topThreeBitsSet = byte & KTop3BitSet; + + // copy over data from the byte into our return value (the top bit is a carry bit) + aVal = byte & KWapQuote; + + // while the 'continue' bit is set and we have more data + while ((byte & KCarryBitMask) && (lenLeft > 0)) + { + // shift our last value up + aVal <<= 7; + // get the next byte + byte = aBuffer[index++]; + // copy it over to the lowest byte + aVal |= byte & KWapQuote; + --lenLeft; + ++numBytes; + } + + // last octet has continue bit set ... NOT allowed Or + // this was encoded wrong - can't have a number bigger than 32 bits + if ((byte & KCarryBitMask) || (numBytes == 5 && topThreeBitsSet)) + return KErrCorrupt; + + // number of bytes read + return numBytes; + } + + +// Extract a WSP encoded MultiOctet Integer encoding into 32-bit integer +// +// In: +// aSource - the source Multi-Octet integer +// +// Out: +// aInt - the 32-bit resulting integer +// +void CHTTPResponse::ExtractMultiOctetInteger(TInt& aInt, const TPtrC8& aSource) const + // Extract a WSP encoded integer from the source descriptor + { + //__LOG_ENTER(_L("CHTTPResponse::ExtractMultiOctetInteger")); + // Get num bytes encoding the integer - + // we are positioned at that location in the source descriptor + TUint8 numBytes = aSource[0]; + aInt = 0; + if (numBytes <= 30) + { + __ASSERT_DEBUG(numBytes <= aSource.Length(), User::Invariant()); + // Loop over the source, taking each byte and shifting it in to the count. + for (TInt count = 1; (count <= numBytes); count++) + aInt = (aInt << 8) + aSource[count]; + } + else if (numBytes & 0x80) // check top bit is set + aInt = numBytes & 0x7f; + // anything between 30 and 127 is not handled... + //__LOG_RETURN; + } + + +// Method to find a named field within the Cache Control header +// +// In: +// aSource - the descriptor containing the date value +// aFrom - The position in the descriptor to start from +// +// Out: +// aTime - a structure containing the time (and date) found in the descriptor +// +// NOTE THIS METHOD WAS EXPORTED FOR TESTING OF THE CACHE. IT SHOULDN'T BE +// NOW, BUT CAN'T BE CHANGED SINCE IT WOULD AFFECT BC. +void CHTTPResponse::ExtractFieldDateValue(const TPtrC8& aSource, + TInt aFrom, + TTime& aTime) const + { + //__LOG_ENTER(_L("CHTTPResponse::ExtractFieldDateValue")); + // Get num bytes encoding the date - + // we are positioned at that location in the source descriptor + TInt time = 0; + TPtrC8 integerSource = aSource.Mid(aFrom); + ExtractMultiOctetInteger(time, integerSource); + // The WSP Date encoding is the number of seconds since the start of the + // UNIX epoch (00:00:00.000, 01-Jan-1970), as a long integer + TDateTime unixEpocDT(1970, EJanuary, 0, 0, 0, 0, 0); + TTime unixEpoch(unixEpocDT); + TTimeIntervalSeconds timeSeconds(time); + aTime = unixEpoch + timeSeconds; + //__LOG_RETURN; + } + + +// Method to find a named field within the Cache Control header +// +// In: +// aField - the field type +// +// Out: +// the found aCacheControl string +// +// Rtn: TInt - set to KErrNotFound if the field was not found, +// otherwise the position in the cache control descriptor that the field +// was found +// +TInt CHTTPResponse::FindCacheControlFieldValue(TCacheControlFieldValue aField, + TPtrC8& aCacheControl) const +// Find a named field within the Cache Control header + { + //__LOG_ENTER(_L("CHTTPResponse::FindCacheControlFieldValue")); + TInt pos = KErrNotFound; + TInt index = LocateField(EHttpCacheControl, 0); + if (index >0) + { + // Have the cache control descriptor + // Now we need to search for the field + + // The following rules are used to encode cache control values. + // Cache-control-value = No-cache | No-store | Max-stale | + // Only-if-cached | Private | Public | + // No-transform | Must-revalidate | + // Proxy-revalidate | Cache-extension | + // Value-length Cache-directive + // Cache-directive = No-cache 1*(Field-name) | + // Max-age Delta-second-value | + // Max-stale Delta-second-value | + // Min-fresh Delta-second-value | + // Private 1*(Field-name) | + // Cache-extension Parameter + TUint8 byteCode = iResponse->Des()[index]; // check the first byte for a recognised value + if((byteCode >= 32) && (byteCode <= 127)) + { + // Hit the start of a Header Name string - this will be assumed + // continuous until the NUL is found or until the end + // of the header is hit (which would be an error) + // - not supported + return pos; + } + switch (byteCode) + { + case ECacheControlNoCache: // "no-cache" + case ECacheCtrlNoStore: // "no-store" + case ECacheCtrlMaxStale: // "max-stale" + case ECacheCtrlOnlyIfCached: // "only-if-cached" + case ECacheCtrlPublic: // "public" + case ECacheCtrlPrivate: // "private" + case ECacheCtrlNoTransform: // "no-transform" + case ECacheCtrlMustRevalidate: // "must-revalidate" + case ECacheCtrlProxyRevalidate: // "proxy-revalidate" + if( aField == byteCode ) + pos = index; // Right here (right now). + break; + case ECacheCtrlCacheExtension: // "cache-extension": + break; // Not handled + default: + { + // Value-length Cache-directive + if(FindBinaryDescField(EHttpCacheControl,aCacheControl)) + { + TInt respLength = aCacheControl.Length(); + TUint8 byteCode = 0; + for (TInt count = 0; count < respLength; count++) + { + byteCode = aCacheControl[count]; + if(aField == byteCode) + { + // Found the field we are looking for + pos = count; + break; + } + else if(count < (respLength - 1)) // Check for overrun... if this occurs it should be an error + { + if (byteCode <= 30) + { + // Codes 0-30 represent that number of following data + // octets, check the cache directive field after the length + if(aField == aCacheControl[count + 1]) + { + // Found the one we want + pos = count + 1; + break; + } + else if(byteCode) + { + // so the following data octets should be skipped + count += byteCode; + } + else + { + __DEBUGGER(); + count++; // 0 data octets follow !???? : (Strange but true) + } + } + else if (byteCode == 31) + { + // Code 31 indicates that the following bytes make a + // UIntVar, which indicates the number of data octets + // after it. + // The UIntVar itself could be composed of upto 5 bytes + // Copy a full 5 bytes from the header + // Note that actually fewer might have been used; + // the UIntVar to Int converter function returns the exact + // number that were used. + TInt value = 0; + TInt consumed = ParseUIntVar(aCacheControl.Mid(count + 1), value); + + if( consumed < KErrNone ) + return KErrCorrupt; + + if(aField == aCacheControl[count + 1 + consumed]) + { + // Found the one we want + pos = count + 1 + consumed; + break; + } + else + { + // so the following data octets should be skipped + count += 1 + consumed + value; + } + } + } + } + } + } + break; + } + } + //__LOG_RETURN; + return pos; + } + + +// Panic method +// +// In: +// aPanicCode - a standard HTTP panic code (see ) +// +/*void CHTTPResponse::Panic(THttpPanicCode aPanicCode) const + { + _LIT(KWapCHTTPResponse, "CHTTPResp"); + User::Panic(KWapCHTTPResponse, aPanicCode); + } +*/ + +#ifdef _DEBUG +// Debug method to dump to log the response header's binary content +// +void CHTTPResponse::DumpToLog(const TDesC8& aData) const + { +// __LOG_ENTER(_L("CHTTPResponse::DumpToLog")); + + // Iterate the supplied block of data in blocks of 16 bytes + //__LOG(_L("CHTTPResponse::DumpToLog : START")); + TInt pos = 0; + TBuf logLine; + TBuf anEntry; + while (pos < aData.Length()) + { + anEntry.Format(TRefByValue_L("%04x : "), pos); + logLine.Append(anEntry); + + // Hex output + for (TInt offset = 0; offset < 16; offset++) + { + if (pos + offset < aData.Length()) + { + TInt nextByte = aData[pos + offset]; + anEntry.Format(TRefByValue_L("%02x "), nextByte); + logLine.Append(anEntry); + } + else + { + anEntry.Format(TRefByValue_L(" ")); + logLine.Append(anEntry); + } + } + anEntry.Format(TRefByValue_L(": ")); + logLine.Append(anEntry); + + // Char output + for (TInt offset = 0; offset < 16; offset++) + { + if (pos + offset < aData.Length()) + { + TInt nextByte = aData[pos + offset]; + if ((nextByte >= 32) && (nextByte <= 127)) + { + anEntry.Format(TRefByValue_L("%c"), nextByte); + logLine.Append(anEntry); + } + else + { + anEntry.Format(TRefByValue_L(".")); + logLine.Append(anEntry); + } + } + else + { + anEntry.Format(TRefByValue_L(" ")); + logLine.Append(anEntry); + } + } + //__LOG1(_L("%S"), &logLine); + logLine.Zero(); + + // Advance to next 16 byte segment + pos += 16; + } + //__LOG(_L("CHTTPResponse::DumpToLog : END")); +// __LOG_RETURN; + } +#endif + + +// Spare methods for future BC. Const- and non-const versions to assist +// the caller in preserving const-ness. IMPORT_C ensures they reserve a +// slot in the vtbl, which is essential to preseve future BC. +// +/*TAny* CHTTPResponse::Extend_CHTTPResponse(TAny* aArgs) + { + Panic(EHttpReservedForFutureExpansion); + return (TAny*)aArgs; + } +TAny* CHTTPResponse::Extend_CHTTPResponse_const(TAny* aArgs) const + { + Panic(EHttpReservedForFutureExpansion); + return (TAny*)aArgs; + } +*/