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| Rev | Author | Line No. | Line |
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| 259 | daniel-mar | 1 | /* |
| 2 | This file is part of a common library |
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| 3 | Copyright (C) 2002-2011 Toby Thain, toby@telegraphics.com.au |
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| 4 | |||
| 5 | This program is free software; you can redistribute it and/or modify |
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| 6 | it under the terms of the GNU General Public License as published by |
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| 7 | the Free Software Foundation; either version 2 of the License, or |
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| 8 | (at your option) any later version. |
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| 9 | |||
| 10 | This program is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 13 | GNU General Public License for more details. |
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| 14 | |||
| 15 | You should have received a copy of the GNU General Public License |
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| 16 | along with this program; if not, write to the Free Software |
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| 17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 18 | */ |
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| 19 | |||
| 20 | /* BigEndian and LittleEndian file I/O for long words, short words, and bytes */ |
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| 21 | |||
| 22 | #include "file_io.h" |
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| 23 | |||
| 24 | int platform_is_LittleEndian(){ |
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| 25 | union{ int a; char b; } u; |
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| 26 | u.a = 1; |
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| 27 | return u.b; |
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| 28 | } |
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| 29 | |||
| 30 | OSErr read4B(FILEREF f, int32_t *v){ |
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| 31 | unsigned char p[4]; |
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| 32 | FILECOUNT count = 4; |
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| 33 | OSErr e = FSREAD(f,&count,p); |
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| 34 | if( !e ) |
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| 35 | *v = ((long)p[0]<<24) | ((long)p[1]<<16) | ((long)p[2]<<8) | p[3]; |
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| 36 | return e; |
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| 37 | } |
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| 38 | |||
| 39 | OSErr read2B(FILEREF f, int16_t *v){ |
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| 40 | unsigned char p[2]; |
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| 41 | FILECOUNT count = 2; |
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| 42 | OSErr e = FSREAD(f,&count,p); |
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| 43 | if( !e ) |
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| 44 | *v = (p[0]<<8) | p[1]; |
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| 45 | return e; |
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| 46 | } |
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| 47 | |||
| 48 | OSErr read4L(FILEREF f, int32_t *v){ |
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| 49 | unsigned char p[4]; |
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| 50 | FILECOUNT count = 4; |
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| 51 | OSErr e = FSREAD(f,&count,p); |
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| 52 | if( !e ) |
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| 53 | *v = ((long)p[3]<<24) | ((long)p[2]<<16) | ((long)p[1]<<8) | p[0]; |
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| 54 | return e; |
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| 55 | } |
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| 56 | |||
| 57 | OSErr read2L(FILEREF f, int16_t *v){ |
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| 58 | unsigned char p[2]; |
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| 59 | FILECOUNT count = 2; |
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| 60 | OSErr e = FSREAD(f,&count,p); |
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| 61 | if( !e ) |
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| 62 | *v = (p[1]<<8) | p[0]; |
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| 63 | return e; |
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| 64 | } |
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| 65 | |||
| 66 | OSErr read1(FILEREF f,unsigned char *v){ |
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| 67 | FILECOUNT count = 1; |
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| 68 | return FSREAD(f,&count,v); |
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| 69 | } |
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| 70 | |||
| 71 | /* |
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| 72 | readdoubleL() - read a LittleEndian (e.g. Intel) 8-byte double floating point value from a file. |
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| 73 | |||
| 74 | This will only work correctly if the compiler's "double" type is IEEE 8-byte format! |
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| 75 | In particular, in Metrowerks 68K C this means setting the "8-byte doubles" option |
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| 76 | and linking with the appropriate library (e.g. "MathLib68K (4i_8d).A4.Lib") |
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| 77 | */ |
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| 78 | |||
| 79 | OSErr readdoubleL(FILEREF f, double *v){ |
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| 80 | OSErr e; |
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| 81 | union { |
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| 82 | int32_t i[2]; |
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| 83 | double d; |
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| 84 | } u; |
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| 85 | int swap = !platform_is_LittleEndian(); |
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| 86 | |||
| 87 | if( !(e = read4L(f, u.i + swap)) && !(e = read4L(f, u.i + 1 - swap)) ) |
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| 88 | *v = u.d; |
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| 89 | return e; |
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| 90 | } |
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| 91 | |||
| 92 | OSErr readfloatB(FILEREF f,float *v){ |
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| 93 | OSErr e; |
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| 94 | union { |
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| 95 | int32_t i; |
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| 96 | float f; |
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| 97 | } u; |
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| 98 | |||
| 99 | if(!(e = read4B(f, &u.i))) |
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| 100 | *v = u.f; |
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| 101 | return e; |
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| 102 | } |
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| 103 | |||
| 104 | OSErr writedoubleL(FILEREF f, double v){ |
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| 105 | OSErr e; |
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| 106 | union { |
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| 107 | int32_t i[2]; |
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| 108 | double d; |
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| 109 | } u; |
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| 110 | int swap = !platform_is_LittleEndian(); |
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| 111 | |||
| 112 | u.d = v; |
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| 113 | if( !(e = write4L(f, u.i[swap])) ) |
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| 114 | e = write4L(f, u.i[1-swap]); |
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| 115 | return e; |
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| 116 | } |
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| 117 | |||
| 118 | OSErr write4B(FILEREF f, int32_t v){ |
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| 119 | unsigned char p[4]; |
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| 120 | FILECOUNT count = 4; |
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| 121 | p[3] = v; |
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| 122 | p[2] = v>>8; |
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| 123 | p[1] = v>>16; |
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| 124 | p[0] = v>>24; |
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| 125 | return FSWRITE(f,&count,p); |
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| 126 | } |
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| 127 | |||
| 128 | OSErr writefloatB(FILEREF f, float v){ |
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| 129 | union { |
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| 130 | int32_t i; |
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| 131 | float f; |
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| 132 | } u; |
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| 133 | |||
| 134 | u.f = v; |
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| 135 | return write4B(f, u.i); |
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| 136 | } |
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| 137 | |||
| 138 | OSErr write2B(FILEREF f, int16_t v){ |
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| 139 | unsigned char p[2]; |
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| 140 | FILECOUNT count = 2; |
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| 141 | p[1] = v; |
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| 142 | p[0] = v>>8; |
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| 143 | return FSWRITE(f,&count,p); |
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| 144 | } |
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| 145 | |||
| 146 | OSErr write4L(FILEREF f, int32_t v){ |
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| 147 | unsigned char p[4]; |
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| 148 | FILECOUNT count = 4; |
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| 149 | p[0] = v; |
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| 150 | p[1] = v>>8; |
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| 151 | p[2] = v>>16; |
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| 152 | p[3] = v>>24; |
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| 153 | return FSWRITE(f,&count,p); |
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| 154 | } |
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| 155 | |||
| 156 | OSErr write2L(FILEREF f, int16_t v){ |
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| 157 | unsigned char p[2]; |
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| 158 | FILECOUNT count = 2; |
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| 159 | p[0] = v; |
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| 160 | p[1] = v>>8; |
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| 161 | return FSWRITE(f,&count,p); |
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| 162 | } |
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| 163 | |||
| 164 | OSErr write1(FILEREF f,unsigned char v){ |
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| 165 | FILECOUNT count = 1; |
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| 166 | return FSWRITE(f,&count,&v); |
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| 167 | } |
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| 168 |