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lightning-sunbird  0.9+nobinonly
nsMimeRebuffer.cpp
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00001 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
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00010  * Software distributed under the License is distributed on an "AS IS" basis,
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00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
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00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
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00036  * ***** END LICENSE BLOCK ***** */
00037 #include <string.h>
00038 #include "nsMimeRebuffer.h"
00039 #include "prmem.h"
00040 
00041 MimeRebuffer::MimeRebuffer(void)
00042 {
00043   mSize = 0;
00044   mBuf = NULL;
00045 }
00046 
00047 MimeRebuffer::~MimeRebuffer(void)
00048 {
00049   if (mBuf)
00050   {
00051     PR_FREEIF(mBuf);
00052     mBuf = NULL;
00053   }
00054 }
00055 
00056 PRUint32
00057 MimeRebuffer::GetSize()
00058 {
00059   return mSize;
00060 }
00061 
00062 PRUint32      
00063 MimeRebuffer::IncreaseBuffer(const char *addBuf, PRUint32 size)
00064 {
00065   if ( (!addBuf) || (size == 0) )
00066     return mSize;
00067 
00068   mBuf = (char *)PR_Realloc(mBuf, size + mSize);
00069   if (!mBuf)
00070   {
00071     mSize = 0;
00072     return mSize;
00073   }
00074 
00075   memcpy(mBuf+mSize, addBuf, size);
00076   mSize += size;
00077   return mSize;
00078 }
00079 
00080 PRUint32      
00081 MimeRebuffer::ReduceBuffer(PRUint32 numBytes)
00082 {
00083   if (numBytes == 0)
00084     return mSize;
00085 
00086   if (!mBuf)
00087   {
00088     mSize = 0;
00089     return mSize;
00090   }
00091 
00092   if (numBytes >= mSize)
00093   {
00094     PR_FREEIF(mBuf);
00095     mBuf = NULL;
00096     mSize = 0;
00097     return mSize;
00098   }
00099 
00100   memcpy(mBuf, mBuf+numBytes, (mSize - numBytes));
00101   mSize -= numBytes;
00102   return mSize;
00103 }
00104 
00105 char *
00106 MimeRebuffer::GetBuffer()
00107 {
00108   return mBuf;
00109 }