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 00027 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 00028 00029 00030 @version Initial version, October 2004 00031 @author Kris 00032 00033 00034 *******************************************************************************/ 00035 00036 module mango.utils.HeapSlice; 00037 00038 /******************************************************************************* 00039 00040 *******************************************************************************/ 00041 00042 class HeapSlice 00043 { 00044 private uint used; 00045 private void[] buffer; 00046 00047 /*********************************************************************** 00048 00049 Create with the specified starting size 00050 00051 ***********************************************************************/ 00052 00053 this (uint size) 00054 { 00055 buffer = new void[size]; 00056 } 00057 00058 /*********************************************************************** 00059 00060 Reset content length to zero 00061 00062 ***********************************************************************/ 00063 00064 void reset () 00065 { 00066 used = 0; 00067 } 00068 00069 /*********************************************************************** 00070 00071 Potentially expand the content space, and return a pointer 00072 to the start of the empty section. 00073 00074 ***********************************************************************/ 00075 00076 void* expand (uint size) 00077 { 00078 if ((used + size) > buffer.length) 00079 buffer.length = (used + size) * 2; 00080 return &buffer [used]; 00081 } 00082 00083 /*********************************************************************** 00084 00085 Return a slice of the content from the current position 00086 with the specified size. Adjusts the current position to 00087 point at an empty zone. 00088 00089 ***********************************************************************/ 00090 00091 void[] slice (int size) 00092 { 00093 uint i = used; 00094 used += size; 00095 return buffer [i..used]; 00096 } 00097 } 00098 00099