gecko/netwerk/protocol/http/nsHttpResponseHead.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla.
*
* The Initial Developer of the Original Code is
* Netscape Communications.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@netscape.com> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsHttpResponseHead_h__
#define nsHttpResponseHead_h__
#include "nsHttpHeaderArray.h"
#include "nsHttp.h"
#include "nsString.h"
//-----------------------------------------------------------------------------
// nsHttpResponseHead represents the status line and headers from an HTTP
// response.
//-----------------------------------------------------------------------------
class nsHttpResponseHead
{
public:
nsHttpResponseHead() : mVersion(NS_HTTP_VERSION_1_1)
, mStatus(200)
, mContentLength(LL_MAXUINT)
, mCacheControlNoStore(false)
, mCacheControlNoCache(false)
, mPragmaNoCache(false) {}
~nsHttpResponseHead()
{
Reset();
}
nsHttpHeaderArray &Headers() { return mHeaders; }
nsHttpVersion Version() { return mVersion; }
PRUint16 Status() { return mStatus; }
const nsAFlatCString &StatusText() { return mStatusText; }
PRInt64 ContentLength() { return mContentLength; }
const nsAFlatCString &ContentType() { return mContentType; }
const nsAFlatCString &ContentCharset() { return mContentCharset; }
bool NoStore() { return mCacheControlNoStore; }
bool NoCache() { return (mCacheControlNoCache || mPragmaNoCache); }
/**
* Full length of the entity. For byte-range requests, this may be larger
* than ContentLength(), which will only represent the requested part of the
* entity.
*/
PRInt64 TotalEntitySize();
const char *PeekHeader(nsHttpAtom h) { return mHeaders.PeekHeader(h); }
nsresult SetHeader(nsHttpAtom h, const nsACString &v, bool m=false);
nsresult GetHeader(nsHttpAtom h, nsACString &v) { return mHeaders.GetHeader(h, v); }
void ClearHeader(nsHttpAtom h) { mHeaders.ClearHeader(h); }
void ClearHeaders() { mHeaders.Clear(); }
const char *FindHeaderValue(nsHttpAtom h, const char *v) { return mHeaders.FindHeaderValue(h, v); }
bool HasHeaderValue(nsHttpAtom h, const char *v) { return mHeaders.HasHeaderValue(h, v); }
void SetContentType(const nsACString &s) { mContentType = s; }
void SetContentCharset(const nsACString &s) { mContentCharset = s; }
void SetContentLength(PRInt64);
// write out the response status line and headers as a single text block,
// optionally pruning out transient headers (ie. headers that only make
// sense the first time the response is handled).
void Flatten(nsACString &, bool pruneTransients);
// parse flattened response head. block must be null terminated. parsing is
// destructive.
nsresult Parse(char *block);
// parse the status line. line must be null terminated.
void ParseStatusLine(const char *line);
// parse a header line. line must be null terminated. parsing is destructive.
nsresult ParseHeaderLine(const char *line);
// cache validation support methods
nsresult ComputeFreshnessLifetime(PRUint32 *);
nsresult ComputeCurrentAge(PRUint32 now, PRUint32 requestTime, PRUint32 *result);
bool MustValidate();
bool MustValidateIfExpired();
// returns true if the server appears to support byte range requests.
bool IsResumable();
// returns true if the Expires header has a value in the past relative to the
// value of the Date header.
bool ExpiresInPast();
// update headers...
nsresult UpdateHeaders(nsHttpHeaderArray &headers);
// reset the response head to it's initial state
void Reset();
// these return failure if the header does not exist.
nsresult ParseDateHeader(nsHttpAtom header, PRUint32 *result);
nsresult GetAgeValue(PRUint32 *result);
nsresult GetMaxAgeValue(PRUint32 *result);
nsresult GetDateValue(PRUint32 *result) { return ParseDateHeader(nsHttp::Date, result); }
nsresult GetExpiresValue(PRUint32 *result);
nsresult GetLastModifiedValue(PRUint32 *result) { return ParseDateHeader(nsHttp::Last_Modified, result); }
private:
void ParseVersion(const char *);
void ParseCacheControl(const char *);
void ParsePragma(const char *);
private:
nsHttpHeaderArray mHeaders;
nsHttpVersion mVersion;
PRUint16 mStatus;
nsCString mStatusText;
PRInt64 mContentLength;
nsCString mContentType;
nsCString mContentCharset;
bool mCacheControlNoStore;
bool mCacheControlNoCache;
bool mPragmaNoCache;
friend struct IPC::ParamTraits<nsHttpResponseHead>;
};
#endif // nsHttpResponseHead_h__