mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-11 16:32:59 +00:00
208 lines
7.1 KiB
C++
208 lines
7.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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.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):
|
|
*
|
|
* 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 "nsSegmentedBuffer.h"
|
|
#include "nsCRT.h"
|
|
|
|
nsresult
|
|
nsSegmentedBuffer::Init(PRUint32 segmentSize, PRUint32 maxSize,
|
|
nsIMemory* allocator)
|
|
{
|
|
if (mSegmentArrayCount != 0)
|
|
return NS_ERROR_FAILURE; // initialized more than once
|
|
mSegmentSize = segmentSize;
|
|
mMaxSize = maxSize;
|
|
mSegAllocator = allocator;
|
|
if (mSegAllocator == nsnull) {
|
|
mSegAllocator = nsMemory::GetGlobalMemoryService();
|
|
}
|
|
else {
|
|
NS_ADDREF(mSegAllocator);
|
|
}
|
|
#if 0 // testing...
|
|
mSegmentArrayCount = 2;
|
|
#else
|
|
mSegmentArrayCount = NS_SEGMENTARRAY_INITIAL_COUNT;
|
|
#endif
|
|
return NS_OK;
|
|
}
|
|
|
|
char*
|
|
nsSegmentedBuffer::AppendNewSegment()
|
|
{
|
|
if (GetSize() >= mMaxSize)
|
|
return nsnull;
|
|
|
|
if (mSegmentArray == nsnull) {
|
|
PRUint32 bytes = mSegmentArrayCount * sizeof(char*);
|
|
mSegmentArray = (char**)nsMemory::Alloc(bytes);
|
|
if (mSegmentArray == nsnull)
|
|
return nsnull;
|
|
memset(mSegmentArray, 0, bytes);
|
|
}
|
|
|
|
if (IsFull()) {
|
|
PRUint32 newArraySize = mSegmentArrayCount * 2;
|
|
PRUint32 bytes = newArraySize * sizeof(char*);
|
|
char** newSegArray = (char**)nsMemory::Realloc(mSegmentArray, bytes);
|
|
if (newSegArray == nsnull)
|
|
return nsnull;
|
|
mSegmentArray = newSegArray;
|
|
// copy wrapped content to new extension
|
|
if (mFirstSegmentIndex > mLastSegmentIndex) {
|
|
// deal with wrap around case
|
|
memcpy(&mSegmentArray[mSegmentArrayCount],
|
|
mSegmentArray,
|
|
mLastSegmentIndex * sizeof(char*));
|
|
memset(mSegmentArray, 0, mLastSegmentIndex * sizeof(char*));
|
|
mLastSegmentIndex += mSegmentArrayCount;
|
|
memset(&mSegmentArray[mLastSegmentIndex], 0,
|
|
(newArraySize - mLastSegmentIndex) * sizeof(char*));
|
|
}
|
|
else {
|
|
memset(&mSegmentArray[mLastSegmentIndex], 0,
|
|
(newArraySize - mLastSegmentIndex) * sizeof(char*));
|
|
}
|
|
mSegmentArrayCount = newArraySize;
|
|
}
|
|
|
|
char* seg = (char*)mSegAllocator->Alloc(mSegmentSize);
|
|
if (seg == nsnull) {
|
|
return nsnull;
|
|
}
|
|
mSegmentArray[mLastSegmentIndex] = seg;
|
|
mLastSegmentIndex = ModSegArraySize(mLastSegmentIndex + 1);
|
|
return seg;
|
|
}
|
|
|
|
PRBool
|
|
nsSegmentedBuffer::DeleteFirstSegment()
|
|
{
|
|
NS_ASSERTION(mSegmentArray[mFirstSegmentIndex] != nsnull, "deleting bad segment");
|
|
(void)mSegAllocator->Free(mSegmentArray[mFirstSegmentIndex]);
|
|
mSegmentArray[mFirstSegmentIndex] = nsnull;
|
|
PRInt32 last = ModSegArraySize(mLastSegmentIndex - 1);
|
|
if (mFirstSegmentIndex == last) {
|
|
mLastSegmentIndex = last;
|
|
return PR_TRUE;
|
|
}
|
|
else {
|
|
mFirstSegmentIndex = ModSegArraySize(mFirstSegmentIndex + 1);
|
|
return PR_FALSE;
|
|
}
|
|
}
|
|
|
|
PRBool
|
|
nsSegmentedBuffer::DeleteLastSegment()
|
|
{
|
|
PRInt32 last = ModSegArraySize(mLastSegmentIndex - 1);
|
|
NS_ASSERTION(mSegmentArray[last] != nsnull, "deleting bad segment");
|
|
(void)mSegAllocator->Free(mSegmentArray[last]);
|
|
mSegmentArray[last] = nsnull;
|
|
mLastSegmentIndex = last;
|
|
return (PRBool)(mLastSegmentIndex == mFirstSegmentIndex);
|
|
}
|
|
|
|
PRBool
|
|
nsSegmentedBuffer::ReallocLastSegment(size_t newSize)
|
|
{
|
|
PRInt32 last = ModSegArraySize(mLastSegmentIndex - 1);
|
|
NS_ASSERTION(mSegmentArray[last] != nsnull, "realloc'ing bad segment");
|
|
char *newSegment =
|
|
(char*)mSegAllocator->Realloc(mSegmentArray[last], newSize);
|
|
if (newSegment) {
|
|
mSegmentArray[last] = newSegment;
|
|
return PR_TRUE;
|
|
} else {
|
|
return PR_FALSE;
|
|
}
|
|
}
|
|
|
|
void
|
|
nsSegmentedBuffer::Empty()
|
|
{
|
|
if (mSegmentArray) {
|
|
for (PRUint32 i = 0; i < mSegmentArrayCount; i++) {
|
|
if (mSegmentArray[i])
|
|
mSegAllocator->Free(mSegmentArray[i]);
|
|
}
|
|
nsMemory::Free(mSegmentArray);
|
|
mSegmentArray = nsnull;
|
|
}
|
|
mSegmentArrayCount = NS_SEGMENTARRAY_INITIAL_COUNT;
|
|
mFirstSegmentIndex = mLastSegmentIndex = 0;
|
|
}
|
|
|
|
#if !defined(MOZ_ENABLE_LIBXUL) && defined(DEBUG)
|
|
NS_COM void
|
|
TestSegmentedBuffer()
|
|
{
|
|
nsSegmentedBuffer* buf = new nsSegmentedBuffer();
|
|
NS_ASSERTION(buf, "out of memory");
|
|
buf->Init(4, 16);
|
|
char* seg;
|
|
PRBool empty;
|
|
seg = buf->AppendNewSegment();
|
|
NS_ASSERTION(seg, "AppendNewSegment failed");
|
|
seg = buf->AppendNewSegment();
|
|
NS_ASSERTION(seg, "AppendNewSegment failed");
|
|
seg = buf->AppendNewSegment();
|
|
NS_ASSERTION(seg, "AppendNewSegment failed");
|
|
empty = buf->DeleteFirstSegment();
|
|
NS_ASSERTION(!empty, "DeleteFirstSegment failed");
|
|
empty = buf->DeleteFirstSegment();
|
|
NS_ASSERTION(!empty, "DeleteFirstSegment failed");
|
|
seg = buf->AppendNewSegment();
|
|
NS_ASSERTION(seg, "AppendNewSegment failed");
|
|
seg = buf->AppendNewSegment();
|
|
NS_ASSERTION(seg, "AppendNewSegment failed");
|
|
seg = buf->AppendNewSegment();
|
|
NS_ASSERTION(seg, "AppendNewSegment failed");
|
|
empty = buf->DeleteFirstSegment();
|
|
NS_ASSERTION(!empty, "DeleteFirstSegment failed");
|
|
empty = buf->DeleteFirstSegment();
|
|
NS_ASSERTION(!empty, "DeleteFirstSegment failed");
|
|
empty = buf->DeleteFirstSegment();
|
|
NS_ASSERTION(!empty, "DeleteFirstSegment failed");
|
|
empty = buf->DeleteFirstSegment();
|
|
NS_ASSERTION(empty, "DeleteFirstSegment failed");
|
|
delete buf;
|
|
}
|
|
#endif
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|