244 lines
7.0 KiB
C++
244 lines
7.0 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim:set ts=4 sw=4 sts=4 et cin: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Darin Fisher <darin@netscape.com> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsHttp.h"
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#include "nsAutoLock.h"
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#include "pldhash.h"
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#include "nsCRT.h"
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#if defined(PR_LOGGING)
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PRLogModuleInfo *gHttpLog = nsnull;
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#endif
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// define storage for all atoms
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#define HTTP_ATOM(_name, _value) nsHttpAtom nsHttp::_name = { _value };
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#include "nsHttpAtomList.h"
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#undef HTTP_ATOM
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// find out how many atoms we have
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#define HTTP_ATOM(_name, _value) Unused_ ## _name,
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enum {
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#include "nsHttpAtomList.h"
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NUM_HTTP_ATOMS
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};
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#undef HTTP_ATOM
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// we keep a linked list of atoms allocated on the heap for easy clean up when
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// the atom table is destroyed. The structure and value string are allocated
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// as one contiguous block.
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struct HttpHeapAtom {
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struct HttpHeapAtom *next;
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char value[1];
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};
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static struct PLDHashTable sAtomTable = {0};
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static struct HttpHeapAtom *sHeapAtoms = nsnull;
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static PRLock *sLock = nsnull;
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HttpHeapAtom *
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NewHeapAtom(const char *value) {
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int len = strlen(value);
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HttpHeapAtom *a =
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NS_REINTERPRET_CAST(HttpHeapAtom *, malloc(sizeof(*a) + len));
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if (!a)
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return nsnull;
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memcpy(a->value, value, len + 1);
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// add this heap atom to the list of all heap atoms
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a->next = sHeapAtoms;
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sHeapAtoms = a;
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return a;
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}
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// Hash string ignore case, based on PL_HashString
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PR_STATIC_CALLBACK(PLDHashNumber)
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StringHash(PLDHashTable *table, const void *key)
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{
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PLDHashNumber h = 0;
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for (const char *s = NS_REINTERPRET_CAST(const char*, key); *s; ++s)
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h = (h >> 28) ^ (h << 4) ^ nsCRT::ToLower(*s);
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return h;
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}
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PR_STATIC_CALLBACK(PRBool)
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StringCompare(PLDHashTable *table, const PLDHashEntryHdr *entry,
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const void *testKey)
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{
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const void *entryKey =
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NS_REINTERPRET_CAST(const PLDHashEntryStub *, entry)->key;
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return PL_strcasecmp(NS_REINTERPRET_CAST(const char *, entryKey),
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NS_REINTERPRET_CAST(const char *, testKey)) == 0;
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}
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static const PLDHashTableOps ops = {
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PL_DHashAllocTable,
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PL_DHashFreeTable,
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PL_DHashGetKeyStub,
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StringHash,
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StringCompare,
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PL_DHashMoveEntryStub,
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PL_DHashClearEntryStub,
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PL_DHashFinalizeStub,
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nsnull
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};
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// We put the atoms in a hash table for speedy lookup.. see ResolveAtom.
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nsresult
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nsHttp::CreateAtomTable()
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{
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NS_ASSERTION(!sAtomTable.ops, "atom table already initialized");
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if (!sLock) {
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sLock = PR_NewLock();
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if (!sLock)
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return NS_ERROR_OUT_OF_MEMORY;
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}
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// The capacity for this table is initialized to a value greater than the
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// number of known atoms (NUM_HTTP_ATOMS) because we expect to encounter a
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// few random headers right off the bat.
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if (!PL_DHashTableInit(&sAtomTable, &ops, nsnull, sizeof(PLDHashEntryStub),
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NUM_HTTP_ATOMS + 10)) {
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sAtomTable.ops = nsnull;
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return NS_ERROR_OUT_OF_MEMORY;
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}
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// fill the table with our known atoms
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const char *const atoms[] = {
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#define HTTP_ATOM(_name, _value) nsHttp::_name._val,
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#include "nsHttpAtomList.h"
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#undef HTTP_ATOM
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nsnull
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};
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for (int i = 0; atoms[i]; ++i) {
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PLDHashEntryStub *stub = NS_REINTERPRET_CAST(PLDHashEntryStub *,
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PL_DHashTableOperate(&sAtomTable, atoms[i], PL_DHASH_ADD));
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if (!stub)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ASSERTION(!stub->key, "duplicate static atom");
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stub->key = atoms[i];
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}
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return NS_OK;
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}
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void
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nsHttp::DestroyAtomTable()
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{
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if (sAtomTable.ops) {
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PL_DHashTableFinish(&sAtomTable);
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sAtomTable.ops = nsnull;
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}
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while (sHeapAtoms) {
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HttpHeapAtom *next = sHeapAtoms->next;
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free(sHeapAtoms);
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sHeapAtoms = next;
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}
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if (sLock) {
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PR_DestroyLock(sLock);
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sLock = nsnull;
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}
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}
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// this function may be called from multiple threads
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nsHttpAtom
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nsHttp::ResolveAtom(const char *str)
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{
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nsHttpAtom atom = { nsnull };
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if (!str || !sAtomTable.ops)
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return atom;
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nsAutoLock lock(sLock);
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PLDHashEntryStub *stub = NS_REINTERPRET_CAST(PLDHashEntryStub *,
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PL_DHashTableOperate(&sAtomTable, str, PL_DHASH_ADD));
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if (!stub)
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return atom; // out of memory
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if (stub->key) {
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atom._val = NS_REINTERPRET_CAST(const char *, stub->key);
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return atom;
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}
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// if the atom could not be found in the atom table, then we'll go
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// and allocate a new atom on the heap.
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HttpHeapAtom *heapAtom = NewHeapAtom(str);
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if (!heapAtom)
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return atom; // out of memory
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stub->key = atom._val = heapAtom->value;
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return atom;
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}
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const char *
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nsHttp::FindToken(const char *input, const char *token, const char *seps)
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{
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if (!input)
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return nsnull;
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int inputLen = strlen(input);
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int tokenLen = strlen(token);
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if (inputLen < tokenLen)
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return nsnull;
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const char *inputTop = input;
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const char *inputEnd = input + inputLen - tokenLen;
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for (; input <= inputEnd; ++input) {
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if (PL_strncasecmp(input, token, tokenLen) == 0) {
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if (input > inputTop && !strchr(seps, *(input - 1)))
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continue;
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if (input < inputEnd && !strchr(seps, *(input + tokenLen)))
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continue;
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return input;
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}
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}
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return nsnull;
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}
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