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HeapSlice.d

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00001 /*******************************************************************************
00002 
00003         @file HeapSlice.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, October 2004      
00034         @author         Kris
00035 
00036 
00037 *******************************************************************************/
00038 
00039 module mango.utils.HeapSlice;
00040 
00041 /*******************************************************************************
00042         
00043 *******************************************************************************/
00044 
00045 class HeapSlice
00046 {
00047         private uint    used;
00048         private void[]  buffer;
00049 
00050         /***********************************************************************
00051         
00052                 Create with the specified starting size
00053 
00054         ***********************************************************************/
00055 
00056         this (uint size)
00057         {
00058                 buffer = new void[size];
00059         }
00060 
00061         /***********************************************************************
00062         
00063                 Reset content length to zero
00064 
00065         ***********************************************************************/
00066 
00067         void reset ()
00068         {
00069                 used = 0;
00070         }
00071 
00072         /***********************************************************************
00073         
00074                 Potentially expand the content space, and return a pointer
00075                 to the start of the empty section.
00076 
00077         ***********************************************************************/
00078 
00079         void* expand (uint size)
00080         {
00081                 if ((used + size) > buffer.length)
00082                      buffer.length = (used + size) * 2;
00083                 return &buffer [used];
00084         }
00085 
00086         /***********************************************************************
00087         
00088                 Return a slice of the content from the current position 
00089                 with the specified size. Adjusts the current position to 
00090                 point at an empty zone.
00091 
00092         ***********************************************************************/
00093 
00094         void[] slice (int size)
00095         {
00096                 uint i = used;
00097                 used += size;
00098                 return buffer [i..used];
00099         }
00100 }
00101 
00102 

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