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