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.base.ByteSwap; 00044 00045 /******************************************************************************* 00046 00047 *******************************************************************************/ 00048 00049 class EndianWriter : Writer 00050 { 00051 typedef void function (void* dst, uint count) Mutator; 00052 00053 /*********************************************************************** 00054 00055 Construct EndianWriter upon the given IBuffer 00056 00057 ***********************************************************************/ 00058 00059 this (IBuffer buffer) 00060 { 00061 super (buffer); 00062 00063 encode.int16 = 00064 encode.int16u = 00065 encode.char16 = &bits16; 00066 00067 encode.int32 = 00068 encode.int32u = 00069 encode.float32 = 00070 encode.char32 = &bits32; 00071 00072 encode.int64 = 00073 encode.int64u = 00074 encode.float64 = &bits64; 00075 00076 encode.float80 = &bits80; 00077 } 00078 00079 /*********************************************************************** 00080 00081 ***********************************************************************/ 00082 00083 void bits16 (void* dst, uint count) 00084 { 00085 write (dst, count, ~1, &ByteSwap.swap16); 00086 } 00087 00088 /*********************************************************************** 00089 00090 ***********************************************************************/ 00091 00092 void bits32 (void* dst, uint count) 00093 { 00094 write (dst, count, ~3, &ByteSwap.swap32); 00095 } 00096 00097 /*********************************************************************** 00098 00099 ***********************************************************************/ 00100 00101 void bits64 (void* dst, uint count) 00102 { 00103 write (dst, count, ~7, &ByteSwap.swap64); 00104 } 00105 00106 /*********************************************************************** 00107 00108 ***********************************************************************/ 00109 00110 void bits80 (void* dst, uint count) 00111 { 00112 write (dst, count, ~15, &ByteSwap.swap80); 00113 } 00114 00115 /*********************************************************************** 00116 00117 ***********************************************************************/ 00118 00119 private void write (void* src, uint count, int mask, Mutator mutate) 00120 { 00121 int writer (void[] dst) 00122 { 00123 // cap bytes written 00124 uint len = dst.length & mask; 00125 if (len > count) 00126 len = count; 00127 00128 dst [0..len] = src [0..len]; 00129 mutate (dst, len); 00130 return len; 00131 } 00132 00133 while (count) 00134 { 00135 //flush if we used all buffer space 00136 if (count -= buffer.write (&writer)) 00137 if (buffer.getConduit) 00138 buffer.flush (); 00139 else 00140 if (! buffer.grow (count)) 00141 throw ovf; 00142 } 00143 } 00144 00145 } 00146