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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.sys.Type,
00044                 mango.sys.ByteSwap;
00045 
00046 /*******************************************************************************
00047 
00048 *******************************************************************************/
00049 
00050 class EndianWriter : Writer
00051 {       
00052         /***********************************************************************
00053         
00054                 Construct EndianWriter upon the given IBuffer
00055 
00056         ***********************************************************************/
00057 
00058         this (IBuffer buffer)
00059         {
00060                 super (buffer);
00061         }
00062 
00063         /***********************************************************************
00064         
00065         ***********************************************************************/
00066 
00067         override IWriter write (void* src, uint bytes, int type)
00068         {
00069                 void write (int mask, void function (void* dst, uint bytes) mutate)
00070                 {
00071                         int writer (void[] dst)
00072                         {
00073                                 // cap bytes written
00074                                 uint len = dst.length & mask;
00075                                 if (len > bytes)
00076                                     len = bytes;
00077 
00078                                 dst [0..len] = src [0..len];
00079                                 mutate (dst, len);
00080                                 return len;
00081                         }
00082 
00083                         while (bytes)
00084                               {
00085                               //flush if we used all buffer space
00086                               if (bytes -= buffer.write (&writer))
00087                                   if (buffer.getConduit)
00088                                       buffer.flush ();
00089                                   else
00090                                      if (! buffer.grow (bytes))
00091                                            error ("output buffer overflow");
00092                               }                          
00093                 }
00094 
00095 
00096                 switch (type)
00097                        {
00098                        case Type.Short:
00099                        case Type.UShort:
00100                        case Type.Utf16:
00101                             write (~1, &ByteSwap.swap16);   
00102                             break;
00103 
00104                        case Type.Int:
00105                        case Type.UInt:
00106                        case Type.Float:
00107                        case Type.Utf32:
00108                             write (~3, &ByteSwap.swap32);   
00109                             break;
00110 
00111                        case Type.Long:
00112                        case Type.ULong:
00113                        case Type.Double:
00114                             write (~7, &ByteSwap.swap64);   
00115                             break;
00116 
00117                        case Type.Real:
00118                             write (~15, &ByteSwap.swap80);   
00119                             break;
00120 
00121                        default:
00122                             super.write (src, bytes, type);
00123                             break;
00124                        }
00125                 return this;
00126         }
00127 }
00128 

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