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EndianWriter.d

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00001 /*******************************************************************************
00002 
00003         @file EndianWriter.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         @author         Kris
00035 
00036 
00037 *******************************************************************************/
00038 
00039 module mango.io.EndianWriter;
00040 
00041 public  import  mango.io.Writer;
00042 
00043 private import  mango.convert.Type;
00044 
00045 private import  mango.sys.ByteSwap;
00046 
00047 /*******************************************************************************
00048 
00049 *******************************************************************************/
00050 
00051 class EndianWriter : Writer
00052 {       
00053         /***********************************************************************
00054         
00055                 Construct EndianWriter upon the given IBuffer
00056 
00057         ***********************************************************************/
00058 
00059         this (IBuffer buffer)
00060         {
00061                 super (buffer);
00062         }
00063 
00064         /***********************************************************************
00065         
00066         ***********************************************************************/
00067 
00068         protected override IWriter write (void* src, uint bytes, int type)
00069         {
00070                 void write (int mask, void function (void* dst, uint bytes) mutate)
00071                 {
00072                         uint writer (void[] dst)
00073                         {
00074                                 // cap bytes written
00075                                 uint len = dst.length & mask;
00076                                 if (len > bytes)
00077                                     len = bytes;
00078 
00079                                 dst [0..len] = src [0..len];
00080                                 mutate (dst, len);
00081                                 return len;
00082                         }
00083 
00084                         while (bytes)
00085                               {
00086                               //flush if we used all buffer space
00087                               if (bytes -= buffer.write (&writer))
00088                                   buffer.makeRoom (bytes);
00089                               }                          
00090                 }
00091 
00092 
00093                 switch (type)
00094                        {
00095                        case Type.Short:
00096                        case Type.UShort:
00097                        case Type.Utf16:
00098                             write (~1, &ByteSwap.swap16);   
00099                             break;
00100 
00101                        case Type.Int:
00102                        case Type.UInt:
00103                        case Type.Float:
00104                        case Type.Utf32:
00105                             write (~3, &ByteSwap.swap32);   
00106                             break;
00107 
00108                        case Type.Long:
00109                        case Type.ULong:
00110                        case Type.Double:
00111                             write (~7, &ByteSwap.swap64);   
00112                             break;
00113 
00114                        case Type.Real:
00115                             write (~15, &ByteSwap.swap80);   
00116                             break;
00117 
00118                        default:
00119                             super.write (src, bytes, type);
00120                             break;
00121                        }
00122                 return this;
00123         }
00124 }
00125 

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