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GrowBuffer.d

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00001 /*******************************************************************************
00002 
00003         @file GrowBuffer.d
00004 
00005         Copyright (c) 2004 Kris Bell
00006         
00007         This software is provided 'as-is', without any express or implied
00008         warranty. In no event will the authors be held liable for damages
00009         of any kind arising from the use of this software.
00010         
00011         Permission is hereby granted to anyone to use this software for any 
00012         purpose, including commercial applications, and to alter it and/or 
00013         redistribute it freely, subject to the following restrictions:
00014         
00015         1. The origin of this software must not be misrepresented; you must 
00016            not claim that you wrote the original software. If you use this 
00017            software in a product, an acknowledgment within documentation of 
00018            said product would be appreciated but is not required.
00019 
00020         2. Altered source versions must be plainly marked as such, and must 
00021            not be misrepresented as being the original software.
00022 
00023         3. This notice may not be removed or altered from any distribution
00024            of the source.
00025 
00026         4. Derivative works are permitted, but they must carry this notice
00027            in full and credit the original source.
00028 
00029 
00030                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
00031 
00032       
00033         @version        Initial version; March 2004
00034 
00035         @author         Kris
00036 
00037 
00038 *******************************************************************************/
00039 
00040 module mango.io.GrowBuffer;
00041 
00042 private import  mango.io.Buffer;
00043 
00044 /*******************************************************************************
00045 
00046         Subclass to provide support for content growth. This is handy when
00047         you want to keep a buffer around as a scratchpad.
00048 
00049 *******************************************************************************/
00050 
00051 class GrowBuffer : Buffer
00052 {
00053         /***********************************************************************
00054         
00055                 Create a GrowBuffer with the specified initial size.
00056 
00057         ***********************************************************************/
00058 
00059         this (uint size)
00060         {
00061                 super (size);
00062         }
00063 
00064         /***********************************************************************
00065 
00066                 Overridable method to grow the buffer to the specified size
00067                 when it becomes full. GrowableBuffer.grow(size) will not grow
00068                 the buffer by a factor larger than 2 for each call.
00069         
00070         ***********************************************************************/
00071 
00072         protected override bool grow (uint size)
00073         {
00074                 if (data.length < uint.max / 2)
00075                    {
00076                    uint i = data.length * 2;
00077                    if (i < size)
00078                        i = size;
00079                    data.length = i;
00080                    capacity = i;
00081                    return true;
00082                    }
00083                 return false;
00084         }
00085 }

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