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gecko-dev/xpcom/ds/nsPersistentProperties.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*/
#define NS_IMPL_IDS
#include "nsPersistentProperties.h"
#include "nsID.h"
#include "nsCRT.h"
#include "nsIInputStream.h"
#include "nsIProperties.h"
#include "nsIUnicharInputStream.h"
#include "nsProperties.h"
#include "pratom.h"
#include "nsEnumeratorUtils.h"
static PLHashNumber
HashKey(const PRUnichar *aString)
{
return (PLHashNumber) nsCRT::HashCode(aString);
}
static PRIntn
CompareKeys(const PRUnichar *aStr1, const PRUnichar *aStr2)
{
return nsCRT::strcmp(aStr1, aStr2) == 0;
}
nsPersistentProperties::nsPersistentProperties()
{
NS_INIT_REFCNT();
mIn = nsnull;
mSubclass = NS_STATIC_CAST(nsIPersistentProperties*, this);
mTable = PL_NewHashTable(128, (PLHashFunction) HashKey,
(PLHashComparator) CompareKeys,
(PLHashComparator) nsnull, nsnull, nsnull);
}
PR_STATIC_CALLBACK(PRIntn)
FreeHashEntries(PLHashEntry* he, PRIntn i, void* arg)
{
nsCRT::free((PRUnichar*)he->key);
nsCRT::free((PRUnichar*)he->value);
return HT_ENUMERATE_REMOVE;
}
nsPersistentProperties::~nsPersistentProperties()
{
if (mTable) {
// Free the PRUnicode* pointers contained in the hash table entries
PL_HashTableEnumerateEntries(mTable, FreeHashEntries, 0);
PL_HashTableDestroy(mTable);
mTable = nsnull;
}
}
NS_METHOD
nsPersistentProperties::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
{
if (aOuter)
return NS_ERROR_NO_AGGREGATION;
nsPersistentProperties* props = new nsPersistentProperties();
if (props == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(props);
nsresult rv = props->QueryInterface(aIID, aResult);
NS_RELEASE(props);
return rv;
}
NS_IMPL_THREADSAFE_ISUPPORTS2(nsPersistentProperties, nsIPersistentProperties, nsIProperties)
NS_IMETHODIMP
nsPersistentProperties::Load(nsIInputStream *aIn)
{
PRInt32 c;
nsresult ret = NS_ERROR_FAILURE;
nsAutoString uesc;
uesc.AssignWithConversion("UTF-8");
#ifndef XPCOM_STANDALONE
ret = NS_NewConverterStream(&mIn, nsnull, aIn, 0, &uesc);
#endif /* XPCOM_STANDALONE */
if (ret != NS_OK) {
#ifdef NS_DEBUG
printf("NS_NewConverterStream failed\n");
#endif
return NS_ERROR_FAILURE;
}
c = Read();
while (1) {
c = SkipWhiteSpace(c);
if (c < 0) {
break;
}
else if ((c == '#') || (c == '!')) {
c = SkipLine(c);
continue;
}
else {
nsAutoString key;
while ((c >= 0) && (c != '=') && (c != ':')) {
key.Append((PRUnichar) c);
c = Read();
}
if (c < 0) {
break;
}
char *trimThese = " \t";
key.Trim(trimThese, PR_FALSE, PR_TRUE);
c = Read();
nsAutoString value;
PRUint32 state = 0;
PRUnichar uchar = 0;
while ((c >= 0) && (c != '\r') && (c != '\n')) {
switch(state) {
case 0:
if (c == '\\') {
c = Read();
switch(c) {
case '\r':
case '\n':
c = SkipWhiteSpace(c);
value.Append((PRUnichar) c);
break;
case 'u':
case 'U':
state = 1;
uchar=0;
break;
case 't':
value.AppendWithConversion('\t');
break;
case 'n':
value.AppendWithConversion('\n');
break;
case 'r':
value.AppendWithConversion('\r');
break;
default:
value.Append((PRUnichar) c);
} // switch(c)
} else {
value.Append((PRUnichar) c);
}
c = Read();
break;
case 1:
case 2:
case 3:
case 4:
if(('0' <= c) && (c <= '9')) {
uchar = (uchar << 4) | (c - '0');
state++;
c = Read();
} else if(('a' <= c) && (c <= 'f')) {
uchar = (uchar << 4) | (c - 'a' + 0x0a);
state++;
c = Read();
} else if(('A' <= c) && (c <= 'F')) {
uchar = (uchar << 4) | (c - 'A' + 0x0a);
state++;
c = Read();
} else {
value.Append((PRUnichar) uchar);
state = 0;
}
break;
case 5:
value.Append((PRUnichar) uchar);
state = 0;
}
}
if(state != 0) {
value.Append((PRUnichar) uchar);
state = 0;
}
value.Trim(trimThese, PR_TRUE, PR_TRUE);
nsAutoString oldValue;
mSubclass->SetStringProperty(key, value, oldValue);
}
}
mIn->Close();
NS_RELEASE(mIn);
NS_ASSERTION(!mIn, "unexpected remaining reference");
return NS_OK;
}
NS_IMETHODIMP
nsPersistentProperties::SetStringProperty(const nsString& aKey, nsString& aNewValue,
nsString& aOldValue)
{
// XXX The ToNewCString() calls allocate memory using "new" so this code
// causes a memory leak...
#if 0
cout << "will add " << aKey.ToNewCString() << "=" << aNewValue.ToNewCString() << endl;
#endif
if (!mTable) {
return NS_ERROR_FAILURE;
}
const PRUnichar *key = aKey.GetUnicode(); // returns internal pointer (not a copy)
PRUint32 len;
PRUint32 hashValue = nsCRT::HashCode(key, &len);
PLHashEntry **hep = PL_HashTableRawLookup(mTable, hashValue, key);
PLHashEntry *he = *hep;
if (he) {
// XXX should we copy the old value to aOldValue, and then remove it?
#ifdef NS_DEBUG
char buf[128];
aKey.ToCString(buf, sizeof(buf));
printf("warning: property %s already exists\n", buf);
#endif
return NS_OK;
}
PL_HashTableRawAdd(mTable, hep, hashValue, aKey.ToNewUnicode(),
aNewValue.ToNewUnicode());
return NS_OK;
}
NS_IMETHODIMP
nsPersistentProperties::Save(nsIOutputStream* aOut, const nsString& aHeader)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsPersistentProperties::Subclass(nsIPersistentProperties* aSubclass)
{
if (aSubclass) {
mSubclass = aSubclass;
}
return NS_OK;
}
NS_IMETHODIMP
nsPersistentProperties::GetStringProperty(const nsString& aKey, nsString& aValue)
{
if (!mTable)
return NS_ERROR_FAILURE;
const PRUnichar *key = aKey.GetUnicode();
PRUint32 len;
PRUint32 hashValue = nsCRT::HashCode(key, &len);
PLHashEntry **hep = PL_HashTableRawLookup(mTable, hashValue, key);
PLHashEntry *he = *hep;
if (he) {
aValue = (const PRUnichar*)he->value;
return NS_OK;
}
return NS_ERROR_FAILURE;
}
PR_STATIC_CALLBACK(PRIntn)
AddElemToArray(PLHashEntry* he, PRIntn i, void* arg)
{
nsISupportsArray *propArray = (nsISupportsArray *) arg;
nsString* keyStr = new nsString((PRUnichar*) he->key);
nsString* valueStr = new nsString((PRUnichar*) he->value);
nsPropertyElement *element = new nsPropertyElement();
if (!element)
return HT_ENUMERATE_STOP;
NS_ADDREF(element);
element->SetKey(keyStr);
element->SetValue(valueStr);
propArray->InsertElementAt(element, i);
return HT_ENUMERATE_NEXT;
}
NS_IMETHODIMP
nsPersistentProperties::EnumerateProperties(nsIBidirectionalEnumerator** aResult)
{
if (!mTable)
return NS_ERROR_FAILURE;
nsISupportsArray* propArray;
nsresult rv = NS_NewISupportsArray(&propArray);
if (rv != NS_OK)
return rv;
// Step through hash entries populating a transient array
PRIntn n = PL_HashTableEnumerateEntries(mTable, AddElemToArray, (void *)propArray);
if ( n < (PRIntn) mTable->nentries )
return NS_ERROR_OUT_OF_MEMORY;
// Convert array into enumerator
rv = NS_NewISupportsArrayEnumerator(propArray, aResult);
if (rv != NS_OK)
return rv;
return NS_OK;
}
NS_IMETHODIMP
nsPersistentProperties::SimpleEnumerateProperties(nsISimpleEnumerator** aResult)
{
nsCOMPtr<nsIBidirectionalEnumerator> iterator;
if (!mTable)
return NS_ERROR_FAILURE;
nsISupportsArray* propArray;
nsresult rv = NS_NewISupportsArray(&propArray);
if (rv != NS_OK)
return rv;
// Step through hash entries populating a transient array
PRIntn n = PL_HashTableEnumerateEntries(mTable, AddElemToArray, (void *)propArray);
if ( n < (PRIntn) mTable->nentries )
return NS_ERROR_OUT_OF_MEMORY;
// Convert array into enumerator
rv = NS_NewISupportsArrayEnumerator(propArray, getter_AddRefs(iterator));
// Convert nsIEnumerator into nsISimpleEnumerator
rv = NS_NewAdapterEnumerator(aResult, iterator);
if (rv != NS_OK)
return rv;
return NS_OK;
}
PRInt32
nsPersistentProperties::Read()
{
PRUnichar c;
PRUint32 nRead;
nsresult ret;
ret = mIn->Read(&c, 0, 1, &nRead);
if (ret == NS_OK && nRead == 1) {
return c;
}
return -1;
}
#define IS_WHITE_SPACE(c) \
(((c) == ' ') || ((c) == '\t') || ((c) == '\r') || ((c) == '\n'))
PRInt32
nsPersistentProperties::SkipWhiteSpace(PRInt32 c)
{
while ((c >= 0) && IS_WHITE_SPACE(c)) {
c = Read();
}
return c;
}
PRInt32
nsPersistentProperties::SkipLine(PRInt32 c)
{
while ((c >= 0) && (c != '\r') && (c != '\n')) {
c = Read();
}
if (c == '\r') {
c = Read();
}
if (c == '\n') {
c = Read();
}
return c;
}
////////////////////////////////////////////////////////////////////////////////
// XXX Some day we'll unify the nsIPersistentProperties interface with
// nsIProperties, but until now...
NS_IMETHODIMP
nsPersistentProperties::Define(const char* prop, nsISupports* initialValue)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsPersistentProperties::Undefine(const char* prop)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsPersistentProperties::Get(const char* prop, const nsIID & uuid, void* *result)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsPersistentProperties::Set(const char* prop, nsISupports* value)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsPersistentProperties::Has(const char* prop, PRBool *result)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
////////////////////////////////////////////////////////////////////////////////
// PropertyElement
////////////////////////////////////////////////////////////////////////////////
nsPropertyElement::nsPropertyElement()
{
NS_INIT_REFCNT();
mKey = nsnull;
mValue = nsnull;
}
nsPropertyElement::~nsPropertyElement()
{
if (mKey)
delete mKey;
if (mValue)
delete mValue;
}
NS_METHOD
nsPropertyElement::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
{
if (aOuter)
return NS_ERROR_NO_AGGREGATION;
nsPropertyElement* propElem = new nsPropertyElement();
if (propElem == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(propElem);
nsresult rv = propElem->QueryInterface(aIID, aResult);
NS_RELEASE(propElem);
return rv;
}
NS_IMPL_ISUPPORTS1(nsPropertyElement, nsIPropertyElement)
NS_IMETHODIMP
nsPropertyElement::GetKey(PRUnichar **aReturnKey)
{
if (aReturnKey)
{
*aReturnKey = (PRUnichar *) mKey->ToNewUnicode();
return NS_OK;
}
return NS_ERROR_INVALID_POINTER;
}
NS_IMETHODIMP
nsPropertyElement::GetValue(PRUnichar **aReturnValue)
{
if (aReturnValue)
{
*aReturnValue = (PRUnichar *) mValue->ToNewUnicode();
return NS_OK;
}
return NS_ERROR_INVALID_POINTER;
}
NS_IMETHODIMP
nsPropertyElement::SetKey(nsString* aKey)
{
mKey = aKey;
return NS_OK;
}
NS_IMETHODIMP
nsPropertyElement::SetValue(nsString* aValue)
{
mValue = aValue;
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
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