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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: 2 -*- */
/* ***** 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.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 ***** */
#include "nsID.h"
#include "nsCRT.h"
#include "nsReadableUtils.h"
#include "nsIInputStream.h"
#include "nsIUnicharInputStream.h"
#include "pratom.h"
#include "nsEnumeratorUtils.h"
#include "nsReadableUtils.h"
#include "nsPrintfCString.h"
#define PL_ARENA_CONST_ALIGN_MASK 3
#include "nsPersistentProperties.h"
#include "nsIProperties.h"
#include "nsProperties.h"
struct PropertyTableEntry : public PLDHashEntryHdr
{
// both of these are arena-allocated
const char *mKey;
const PRUnichar *mValue;
};
static PRUnichar*
ArenaStrdup(const nsAFlatString& aString, PLArenaPool* aArena)
{
void *mem;
// add one to include the null terminator
PRInt32 len = (aString.Length()+1) * sizeof(PRUnichar);
PL_ARENA_ALLOCATE(mem, aArena, len);
NS_ASSERTION(mem, "Couldn't allocate space!\n");
if (mem) {
memcpy(mem, aString.get(), len);
}
return NS_STATIC_CAST(PRUnichar*, mem);
}
static char*
ArenaStrdup(const nsAFlatCString& aString, PLArenaPool* aArena)
{
void *mem;
// add one to include the null terminator
PRInt32 len = (aString.Length()+1) * sizeof(char);
PL_ARENA_ALLOCATE(mem, aArena, len);
NS_ASSERTION(mem, "Couldn't allocate space!\n");
if (mem)
memcpy(mem, aString.get(), len);
return NS_STATIC_CAST(char*, mem);
}
static const struct PLDHashTableOps property_HashTableOps = {
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashGetKeyStub,
PL_DHashStringKey,
PL_DHashMatchStringKey,
PL_DHashMoveEntryStub,
PL_DHashClearEntryStub,
PL_DHashFinalizeStub,
nsnull,
};
nsPersistentProperties::nsPersistentProperties()
: mIn(nsnull)
{
mSubclass = NS_STATIC_CAST(nsIPersistentProperties*, this);
mTable.ops = nsnull;
PL_INIT_ARENA_POOL(&mArena, "PersistentPropertyArena", 2048);
}
nsPersistentProperties::~nsPersistentProperties()
{
PL_FinishArenaPool(&mArena);
if (mTable.ops)
PL_DHashTableFinish(&mTable);
}
nsresult
nsPersistentProperties::Init()
{
if (!PL_DHashTableInit(&mTable, &property_HashTableOps, nsnull,
sizeof(PropertyTableEntry), 20)) {
mTable.ops = nsnull;
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
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->Init();
if (NS_SUCCEEDED(rv))
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_NewUTF8ConverterStream(&mIn, aIn, 0);
if (ret != NS_OK) {
NS_WARNING("NS_NewUTF8ConverterStream failed");
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;
}
static const 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':
// Only skip first EOL characters and then next line's
// whitespace characters. Skipping all EOL characters
// and all upcoming whitespace is too agressive.
if (c == '\r')
c = Read();
if (c == '\n')
c = Read();
while (c == ' ' || c == '\t')
c = Read();
continue;
case 'u':
case 'U':
state = 1;
uchar=0;
break;
case 't':
value.Append(PRUnichar('\t'));
break;
case 'n':
value.Append(PRUnichar('\n'));
break;
case 'r':
value.Append(PRUnichar('\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(NS_ConvertUCS2toUTF8(key), value, oldValue);
}
}
mIn->Close();
NS_RELEASE(mIn);
return NS_OK;
}
NS_IMETHODIMP
nsPersistentProperties::SetStringProperty(const nsACString& aKey,
const nsAString& aNewValue,
nsAString& aOldValue)
{
#if 0
cout << "will add " << aKey.get() << "=" <<
NS_LossyConvertUCS2ToASCII(aNewValue).get() << endl;
#endif
const nsAFlatCString& flatKey = PromiseFlatCString(aKey);
PropertyTableEntry *entry =
NS_STATIC_CAST(PropertyTableEntry*,
PL_DHashTableOperate(&mTable, flatKey.get(), PL_DHASH_ADD));
if (entry->mKey) {
aOldValue = entry->mValue;
NS_WARNING(nsPrintfCString(aKey.Length() + 30,
"the property %s already exists\n",
flatKey.get()).get());
}
entry->mKey = ArenaStrdup(flatKey, &mArena);
entry->mValue = ArenaStrdup(PromiseFlatString(aNewValue), &mArena);
return NS_OK;
}
NS_IMETHODIMP
nsPersistentProperties::Save(nsIOutputStream* aOut, const nsACString& aHeader)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsPersistentProperties::Subclass(nsIPersistentProperties* aSubclass)
{
if (aSubclass) {
mSubclass = aSubclass;
}
return NS_OK;
}
NS_IMETHODIMP
nsPersistentProperties::GetStringProperty(const nsACString& aKey,
nsAString& aValue)
{
const nsAFlatCString& flatKey = PromiseFlatCString(aKey);
PropertyTableEntry *entry =
NS_STATIC_CAST(PropertyTableEntry*,
PL_DHashTableOperate(&mTable, flatKey.get(), PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_FREE(entry))
return NS_ERROR_FAILURE;
aValue = entry->mValue;
return NS_OK;
}
PR_STATIC_CALLBACK(PLDHashOperator)
AddElemToArray(PLDHashTable* table, PLDHashEntryHdr *hdr,
PRUint32 i, void *arg)
{
nsISupportsArray *propArray = (nsISupportsArray *) arg;
PropertyTableEntry* entry =
NS_STATIC_CAST(PropertyTableEntry*, hdr);
nsPropertyElement *element =
new nsPropertyElement(nsDependentCString(entry->mKey),
nsDependentString(entry->mValue));
if (!element)
return PL_DHASH_STOP;
propArray->InsertElementAt(element, i);
return PL_DHASH_NEXT;
}
NS_IMETHODIMP
nsPersistentProperties::Enumerate(nsISimpleEnumerator** aResult)
{
nsCOMPtr<nsISupportsArray> propArray;
nsresult rv = NS_NewISupportsArray(getter_AddRefs(propArray));
if (NS_FAILED(rv))
return rv;
// We know the necessary size; we can avoid growing it while adding elements
if (!propArray->SizeTo(mTable.entryCount))
return NS_ERROR_OUT_OF_MEMORY;
// Step through hash entries populating a transient array
PRUint32 n =
PL_DHashTableEnumerate(&mTable, AddElemToArray, (void *)propArray);
if (n < mTable.entryCount)
return NS_ERROR_OUT_OF_MEMORY;
return NS_NewArrayEnumerator(aResult, propArray);
}
PRInt32
nsPersistentProperties::Read()
{
PRUnichar c;
PRUint32 nRead;
nsresult ret;
ret = mIn->Read(&c, 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 (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::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::Undefine(const char* prop)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsPersistentProperties::Has(const char* prop, PRBool *result)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsPersistentProperties::GetKeys(PRUint32 *count, char ***keys)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
////////////////////////////////////////////////////////////////////////////////
// PropertyElement
////////////////////////////////////////////////////////////////////////////////
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(nsACString& aReturnKey)
{
aReturnKey = mKey;
return NS_OK;
}
NS_IMETHODIMP
nsPropertyElement::GetValue(nsAString& aReturnValue)
{
aReturnValue = mValue;
return NS_OK;
}
NS_IMETHODIMP
nsPropertyElement::SetKey(const nsACString& aKey)
{
mKey = aKey;
return NS_OK;
}
NS_IMETHODIMP
nsPropertyElement::SetValue(const nsAString& aValue)
{
mValue = aValue;
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
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