1 | /* $Header: /afs/dev.mit.edu/source/repository/third/tiff/libtiff/tif_vms.c,v 1.1.1.1 2002-12-26 02:37:36 ghudson Exp $ */ |
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2 | |
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3 | /* |
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4 | * Copyright (c) 1988-1997 Sam Leffler |
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5 | * Copyright (c) 1991-1997 Silicon Graphics, Inc. |
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6 | * |
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7 | * Permission to use, copy, modify, distribute, and sell this software and |
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8 | * its documentation for any purpose is hereby granted without fee, provided |
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9 | * that (i) the above copyright notices and this permission notice appear in |
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10 | * all copies of the software and related documentation, and (ii) the names of |
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11 | * Sam Leffler and Silicon Graphics may not be used in any advertising or |
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12 | * publicity relating to the software without the specific, prior written |
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13 | * permission of Sam Leffler and Silicon Graphics. |
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14 | * |
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15 | * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, |
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16 | * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY |
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17 | * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. |
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18 | * |
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19 | * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR |
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20 | * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, |
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21 | * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
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22 | * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF |
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23 | * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
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24 | * OF THIS SOFTWARE. |
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25 | */ |
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26 | |
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27 | /* |
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28 | * TIFF Library VMS-specific Routines. |
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29 | */ |
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30 | |
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31 | #include <stdlib.h> |
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32 | #include <unixio.h> |
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33 | #include "tiffiop.h" |
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34 | #if !HAVE_IEEEFP |
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35 | #include <math.h> |
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36 | #endif |
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37 | |
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38 | #ifdef VAXC |
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39 | #define NOSHARE noshare |
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40 | #else |
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41 | #define NOSHARE |
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42 | #endif |
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43 | |
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44 | #ifdef __alpha |
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45 | /* Dummy entry point for backwards compatibility */ |
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46 | void TIFFModeCCITTFax3(void){} |
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47 | #endif |
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48 | |
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49 | static tsize_t |
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50 | _tiffReadProc(thandle_t fd, tdata_t buf, tsize_t size) |
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51 | { |
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52 | return (read((int) fd, buf, size)); |
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53 | } |
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54 | |
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55 | static tsize_t |
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56 | _tiffWriteProc(thandle_t fd, tdata_t buf, tsize_t size) |
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57 | { |
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58 | return (write((int) fd, buf, size)); |
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59 | } |
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60 | |
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61 | static toff_t |
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62 | _tiffSeekProc(thandle_t fd, toff_t off, int whence) |
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63 | { |
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64 | return ((toff_t) lseek((int) fd, (off_t) off, whence)); |
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65 | } |
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66 | |
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67 | static int |
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68 | _tiffCloseProc(thandle_t fd) |
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69 | { |
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70 | return (close((int) fd)); |
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71 | } |
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72 | |
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73 | #include <sys/stat.h> |
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74 | |
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75 | static toff_t |
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76 | _tiffSizeProc(thandle_t fd) |
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77 | { |
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78 | struct stat sb; |
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79 | return (toff_t) (fstat((int) fd, &sb) < 0 ? 0 : sb.st_size); |
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80 | } |
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81 | |
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82 | #ifdef HAVE_MMAP |
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83 | #include <starlet.h> |
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84 | #include <fab.h> |
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85 | #include <secdef.h> |
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86 | |
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87 | /* |
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88 | * Table for storing information on current open sections. |
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89 | * (Should really be a linked list) |
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90 | */ |
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91 | #define MAX_MAPPED 100 |
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92 | static int no_mapped = 0; |
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93 | static struct { |
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94 | char *base; |
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95 | char *top; |
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96 | unsigned short channel; |
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97 | } map_table[MAX_MAPPED]; |
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98 | |
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99 | /* |
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100 | * This routine maps a file into a private section. Note that this |
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101 | * method of accessing a file is by far the fastest under VMS. |
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102 | * The routine may fail (i.e. return 0) for several reasons, for |
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103 | * example: |
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104 | * - There is no more room for storing the info on sections. |
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105 | * - The process is out of open file quota, channels, ... |
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106 | * - fd does not describe an opened file. |
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107 | * - The file is already opened for write access by this process |
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108 | * or another process |
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109 | * - There is no free "hole" in virtual memory that fits the |
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110 | * size of the file |
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111 | */ |
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112 | static int |
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113 | _tiffMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize) |
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114 | { |
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115 | char name[256]; |
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116 | struct FAB fab; |
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117 | unsigned short channel; |
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118 | char *inadr[2], *retadr[2]; |
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119 | unsigned long status; |
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120 | long size; |
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121 | |
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122 | if (no_mapped >= MAX_MAPPED) |
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123 | return(0); |
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124 | /* |
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125 | * We cannot use a file descriptor, we |
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126 | * must open the file once more. |
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127 | */ |
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128 | if (getname((int)fd, name, 1) == NULL) |
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129 | return(0); |
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130 | /* prepare the FAB for a user file open */ |
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131 | fab = cc$rms_fab; |
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132 | fab.fab$l_fop |= FAB$V_UFO; |
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133 | fab.fab$b_fac = FAB$M_GET; |
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134 | fab.fab$b_shr = FAB$M_SHRGET; |
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135 | fab.fab$l_fna = name; |
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136 | fab.fab$b_fns = strlen(name); |
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137 | status = sys$open(&fab); /* open file & get channel number */ |
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138 | if ((status&1) == 0) |
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139 | return(0); |
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140 | channel = (unsigned short)fab.fab$l_stv; |
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141 | inadr[0] = inadr[1] = (char *)0; /* just an address in P0 space */ |
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142 | /* |
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143 | * Map the blocks of the file up to |
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144 | * the EOF block into virtual memory. |
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145 | */ |
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146 | size = _tiffSizeProc(fd); |
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147 | status = sys$crmpsc(inadr, retadr, 0, SEC$M_EXPREG, 0,0,0, channel, |
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148 | TIFFhowmany(size,512), 0,0,0); |
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149 | if ((status&1) == 0){ |
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150 | sys$dassgn(channel); |
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151 | return(0); |
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152 | } |
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153 | *pbase = (tdata_t) retadr[0]; /* starting virtual address */ |
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154 | /* |
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155 | * Use the size of the file up to the |
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156 | * EOF mark for UNIX compatibility. |
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157 | */ |
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158 | *psize = (toff_t) size; |
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159 | /* Record the section in the table */ |
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160 | map_table[no_mapped].base = retadr[0]; |
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161 | map_table[no_mapped].top = retadr[1]; |
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162 | map_table[no_mapped].channel = channel; |
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163 | no_mapped++; |
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164 | |
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165 | return(1); |
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166 | } |
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167 | |
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168 | /* |
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169 | * This routine unmaps a section from the virtual address space of |
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170 | * the process, but only if the base was the one returned from a |
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171 | * call to TIFFMapFileContents. |
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172 | */ |
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173 | static void |
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174 | _tiffUnmapProc(thandle_t fd, tdata_t base, toff_t size) |
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175 | { |
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176 | char *inadr[2]; |
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177 | int i, j; |
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178 | |
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179 | /* Find the section in the table */ |
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180 | for (i = 0;i < no_mapped; i++) { |
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181 | if (map_table[i].base == (char *) base) { |
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182 | /* Unmap the section */ |
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183 | inadr[0] = (char *) base; |
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184 | inadr[1] = map_table[i].top; |
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185 | sys$deltva(inadr, 0, 0); |
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186 | sys$dassgn(map_table[i].channel); |
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187 | /* Remove this section from the list */ |
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188 | for (j = i+1; j < no_mapped; j++) |
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189 | map_table[j-1] = map_table[j]; |
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190 | no_mapped--; |
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191 | return; |
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192 | } |
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193 | } |
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194 | } |
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195 | #else /* !HAVE_MMAP */ |
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196 | static int |
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197 | _tiffMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize) |
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198 | { |
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199 | return (0); |
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200 | } |
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201 | |
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202 | static void |
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203 | _tiffUnmapProc(thandle_t fd, tdata_t base, toff_t size) |
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204 | { |
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205 | } |
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206 | #endif /* !HAVE_MMAP */ |
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207 | |
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208 | /* |
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209 | * Open a TIFF file descriptor for read/writing. |
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210 | */ |
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211 | TIFF* |
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212 | TIFFFdOpen(int fd, const char* name, const char* mode) |
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213 | { |
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214 | TIFF* tif; |
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215 | |
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216 | tif = TIFFClientOpen(name, mode, |
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217 | (thandle_t) fd, |
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218 | _tiffReadProc, _tiffWriteProc, _tiffSeekProc, _tiffCloseProc, |
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219 | _tiffSizeProc, _tiffMapProc, _tiffUnmapProc); |
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220 | if (tif) |
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221 | tif->tif_fd = fd; |
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222 | return (tif); |
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223 | } |
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224 | |
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225 | /* |
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226 | * Open a TIFF file for read/writing. |
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227 | */ |
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228 | TIFF* |
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229 | TIFFOpen(const char* name, const char* mode) |
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230 | { |
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231 | static const char module[] = "TIFFOpen"; |
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232 | int m, fd; |
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233 | |
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234 | m = _TIFFgetMode(mode, module); |
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235 | if (m == -1) |
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236 | return ((TIFF*)0); |
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237 | if (m&O_TRUNC){ |
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238 | /* |
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239 | * There is a bug in open in VAXC. If you use |
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240 | * open w/ m=O_RDWR|O_CREAT|O_TRUNC the |
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241 | * wrong thing happens. On the other hand |
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242 | * creat does the right thing. |
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243 | */ |
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244 | fd = creat((char *) /* bug in stdio.h */ name, 0666, |
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245 | "alq = 128", "deq = 64", "mbc = 32", |
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246 | "fop = tef"); |
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247 | } else if (m&O_RDWR) { |
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248 | fd = open(name, m, 0666, |
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249 | "deq = 64", "mbc = 32", "fop = tef", "ctx = stm"); |
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250 | } else |
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251 | fd = open(name, m, 0666, "mbc = 32", "ctx = stm"); |
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252 | if (fd < 0) { |
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253 | TIFFError(module, "%s: Cannot open", name); |
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254 | return ((TIFF*)0); |
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255 | } |
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256 | return (TIFFFdOpen(fd, name, mode)); |
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257 | } |
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258 | |
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259 | tdata_t |
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260 | _TIFFmalloc(tsize_t s) |
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261 | { |
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262 | return (malloc((size_t) s)); |
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263 | } |
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264 | |
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265 | void |
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266 | _TIFFfree(tdata_t p) |
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267 | { |
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268 | free(p); |
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269 | } |
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270 | |
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271 | tdata_t |
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272 | _TIFFrealloc(tdata_t p, tsize_t s) |
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273 | { |
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274 | return (realloc(p, (size_t) s)); |
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275 | } |
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276 | |
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277 | void |
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278 | _TIFFmemset(tdata_t p, int v, tsize_t c) |
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279 | { |
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280 | memset(p, v, (size_t) c); |
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281 | } |
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282 | |
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283 | void |
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284 | _TIFFmemcpy(tdata_t d, const tdata_t s, tsize_t c) |
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285 | { |
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286 | memcpy(d, s, (size_t) c); |
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287 | } |
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288 | |
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289 | int |
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290 | _TIFFmemcmp(const tdata_t p1, const tdata_t p2, tsize_t c) |
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291 | { |
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292 | return (memcmp(p1, p2, (size_t) c)); |
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293 | } |
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294 | |
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295 | /* |
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296 | * On the VAX, we need to make those global, writable pointers |
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297 | * non-shareable, otherwise they would be made shareable by default. |
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298 | * On the AXP, this brain damage has been corrected. |
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299 | * |
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300 | * I (Karsten Spang, krs@kampsax.dk) have dug around in the GCC |
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301 | * manual and the GAS code and have come up with the following |
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302 | * construct, but I don't have GCC on my VAX, so it is untested. |
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303 | * Please tell me if it does not work. |
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304 | */ |
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305 | |
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306 | static void |
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307 | vmsWarningHandler(const char* module, const char* fmt, va_list ap) |
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308 | { |
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309 | if (module != NULL) |
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310 | fprintf(stderr, "%s: ", module); |
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311 | fprintf(stderr, "Warning, "); |
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312 | vfprintf(stderr, fmt, ap); |
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313 | fprintf(stderr, ".\n"); |
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314 | } |
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315 | |
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316 | NOSHARE TIFFErrorHandler _TIFFwarningHandler = vmsWarningHandler |
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317 | #if defined(VAX) && defined(__GNUC__) |
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318 | asm("_$$PsectAttributes_NOSHR$$_TIFFwarningHandler") |
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319 | #endif |
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320 | ; |
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321 | |
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322 | static void |
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323 | vmsErrorHandler(const char* module, const char* fmt, va_list ap) |
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324 | { |
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325 | if (module != NULL) |
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326 | fprintf(stderr, "%s: ", module); |
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327 | vfprintf(stderr, fmt, ap); |
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328 | fprintf(stderr, ".\n"); |
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329 | } |
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330 | |
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331 | NOSHARE TIFFErrorHandler _TIFFerrorHandler = vmsErrorHandler |
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332 | #if defined(VAX) && defined(__GNUC__) |
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333 | asm("_$$PsectAttributes_NOSHR$$_TIFFerrorHandler") |
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334 | #endif |
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335 | ; |
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336 | |
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337 | |
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338 | #if !HAVE_IEEEFP |
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339 | /* IEEE floting point handling */ |
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340 | |
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341 | typedef struct ieeedouble { |
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342 | u_long mant2; /* fix NDR: full 8-byte swap */ |
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343 | u_long mant : 20, |
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344 | exp : 11, |
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345 | sign : 1; |
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346 | } ieeedouble; |
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347 | typedef struct ieeefloat { |
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348 | u_long mant : 23, |
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349 | exp : 8, |
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350 | sign : 1; |
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351 | } ieeefloat; |
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352 | |
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353 | /* |
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354 | * NB: These are D_FLOAT's, not G_FLOAT's. A G_FLOAT is |
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355 | * simply a reverse-IEEE float/double. |
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356 | */ |
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357 | |
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358 | typedef struct { |
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359 | u_long mant1 : 7, |
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360 | exp : 8, |
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361 | sign : 1, |
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362 | mant2 : 16, |
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363 | mant3 : 16, |
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364 | mant4 : 16; |
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365 | } nativedouble; |
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366 | typedef struct { |
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367 | u_long mant1 : 7, |
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368 | exp : 8, |
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369 | sign : 1, |
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370 | mant2 : 16; |
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371 | } nativefloat; |
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372 | |
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373 | typedef union { |
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374 | ieeedouble ieee; |
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375 | nativedouble native; |
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376 | char b[8]; |
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377 | uint32 l[2]; |
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378 | double d; |
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379 | } double_t; |
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380 | |
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381 | typedef union { |
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382 | ieeefloat ieee; |
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383 | nativefloat native; |
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384 | char b[4]; |
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385 | uint32 l; |
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386 | float f; |
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387 | } float_t; |
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388 | |
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389 | #if defined(VAXC) || defined(DECC) |
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390 | #pragma inline(ieeetod,dtoieee) |
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391 | #endif |
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392 | |
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393 | /* |
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394 | * Convert an IEEE double precision number to native double precision. |
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395 | * The source is contained in two longwords, the second holding the sign, |
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396 | * exponent and the higher order bits of the mantissa, and the first |
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397 | * holding the rest of the mantissa as follows: |
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398 | * (Note: It is assumed that the number has been eight-byte swapped to |
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399 | * LSB first.) |
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400 | * |
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401 | * First longword: |
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402 | * 32 least significant bits of mantissa |
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403 | * Second longword: |
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404 | * 0-19: 20 most significant bits of mantissa |
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405 | * 20-30: exponent |
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406 | * 31: sign |
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407 | * The exponent is stored as excess 1023. |
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408 | * The most significant bit of the mantissa is implied 1, and not stored. |
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409 | * If the exponent and mantissa are zero, the number is zero. |
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410 | * If the exponent is 0 (i.e. -1023) and the mantissa is non-zero, it is an |
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411 | * unnormalized number with the most significant bit NOT implied. |
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412 | * If the exponent is 2047, the number is invalid, in case the mantissa is zero, |
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413 | * this means overflow (+/- depending of the sign bit), otherwise |
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414 | * it simply means invalid number. |
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415 | * |
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416 | * If the number is too large for the machine or was specified as overflow, |
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417 | * +/-HUGE_VAL is returned. |
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418 | */ |
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419 | INLINE static void |
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420 | ieeetod(double *dp) |
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421 | { |
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422 | double_t source; |
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423 | long sign,exp,mant; |
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424 | double dmant; |
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425 | |
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426 | source.ieee = ((double_t*)dp)->ieee; |
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427 | sign = source.ieee.sign; |
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428 | exp = source.ieee.exp; |
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429 | mant = source.ieee.mant; |
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430 | |
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431 | if (exp == 2047) { |
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432 | if (mant) /* Not a Number (NAN) */ |
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433 | *dp = HUGE_VAL; |
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434 | else /* +/- infinity */ |
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435 | *dp = (sign ? -HUGE_VAL : HUGE_VAL); |
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436 | return; |
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437 | } |
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438 | if (!exp) { |
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439 | if (!(mant || source.ieee.mant2)) { /* zero */ |
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440 | *dp=0; |
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441 | return; |
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442 | } else { /* Unnormalized number */ |
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443 | /* NB: not -1023, the 1 bit is not implied */ |
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444 | exp= -1022; |
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445 | } |
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446 | } else { |
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447 | mant |= 1<<20; |
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448 | exp -= 1023; |
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449 | } |
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450 | dmant = (((double) mant) + |
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451 | ((double) source.ieee.mant2) / (((double) (1<<16)) * |
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452 | ((double) (1<<16)))) / (double) (1<<20); |
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453 | dmant = ldexp(dmant, exp); |
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454 | if (sign) |
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455 | dmant= -dmant; |
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456 | *dp = dmant; |
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457 | } |
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458 | |
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459 | INLINE static void |
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460 | dtoieee(double *dp) |
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461 | { |
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462 | double_t num; |
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463 | double x; |
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464 | int exp; |
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465 | |
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466 | num.d = *dp; |
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467 | if (!num.d) { /* Zero is just binary all zeros */ |
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468 | num.l[0] = num.l[1] = 0; |
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469 | return; |
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470 | } |
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471 | |
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472 | if (num.d < 0) { /* Sign is encoded separately */ |
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473 | num.d = -num.d; |
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474 | num.ieee.sign = 1; |
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475 | } else { |
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476 | num.ieee.sign = 0; |
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477 | } |
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478 | |
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479 | /* Now separate the absolute value into mantissa and exponent */ |
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480 | x = frexp(num.d, &exp); |
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481 | |
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482 | /* |
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483 | * Handle cases where the value is outside the |
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484 | * range for IEEE floating point numbers. |
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485 | * (Overflow cannot happen on a VAX, but underflow |
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486 | * can happen for G float.) |
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487 | */ |
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488 | if (exp < -1022) { /* Unnormalized number */ |
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489 | x = ldexp(x, -1023-exp); |
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490 | exp = 0; |
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491 | } else if (exp > 1023) { /* +/- infinity */ |
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492 | x = 0; |
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493 | exp = 2047; |
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494 | } else { /* Get rid of most significant bit */ |
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495 | x *= 2; |
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496 | x -= 1; |
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497 | exp += 1022; /* fix NDR: 1.0 -> x=0.5, exp=1 -> ieee.exp = 1023 */ |
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498 | } |
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499 | num.ieee.exp = exp; |
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500 | |
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501 | x *= (double) (1<<20); |
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502 | num.ieee.mant = (long) x; |
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503 | x -= (double) num.ieee.mant; |
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504 | num.ieee.mant2 = (long) (x*((double) (1<<16)*(double) (1<<16))); |
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505 | |
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506 | if (!(num.ieee.mant || num.ieee.exp || num.ieee.mant2)) { |
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507 | /* Avoid negative zero */ |
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508 | num.ieee.sign = 0; |
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509 | } |
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510 | ((double_t*)dp)->ieee = num.ieee; |
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511 | } |
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512 | |
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513 | /* |
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514 | * Beware, these do not handle over/under-flow |
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515 | * during conversion from ieee to native format. |
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516 | */ |
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517 | #define NATIVE2IEEEFLOAT(fp) { \ |
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518 | float_t t; \ |
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519 | if (t.ieee.exp = (fp)->native.exp) \ |
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520 | t.ieee.exp += -129 + 127; \ |
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521 | t.ieee.sign = (fp)->native.sign; \ |
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522 | t.ieee.mant = ((fp)->native.mant1<<16)|(fp)->native.mant2; \ |
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523 | *(fp) = t; \ |
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524 | } |
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525 | #define IEEEFLOAT2NATIVE(fp) { \ |
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526 | float_t t; int v = (fp)->ieee.exp; \ |
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527 | if (v) v += -127 + 129; /* alter bias of exponent */\ |
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528 | t.native.exp = v; /* implicit truncation of exponent */\ |
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529 | t.native.sign = (fp)->ieee.sign; \ |
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530 | v = (fp)->ieee.mant; \ |
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531 | t.native.mant1 = v >> 16; \ |
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532 | t.native.mant2 = v;\ |
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533 | *(fp) = t; \ |
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534 | } |
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535 | |
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536 | #define IEEEDOUBLE2NATIVE(dp) ieeetod(dp) |
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537 | |
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538 | #define NATIVE2IEEEDOUBLE(dp) dtoieee(dp) |
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539 | |
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540 | |
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541 | /* |
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542 | * These unions are used during floating point |
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543 | * conversions. The above macros define the |
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544 | * conversion operations. |
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545 | */ |
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546 | void |
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547 | TIFFCvtIEEEFloatToNative(TIFF* tif, u_int n, float* f) |
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548 | { |
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549 | float_t* fp = (float_t*) f; |
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550 | |
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551 | while (n-- > 0) { |
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552 | IEEEFLOAT2NATIVE(fp); |
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553 | fp++; |
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554 | } |
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555 | } |
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556 | |
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557 | void |
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558 | TIFFCvtNativeToIEEEFloat(TIFF* tif, u_int n, float* f) |
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559 | { |
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560 | float_t* fp = (float_t*) f; |
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561 | |
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562 | while (n-- > 0) { |
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563 | NATIVE2IEEEFLOAT(fp); |
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564 | fp++; |
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565 | } |
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566 | } |
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567 | void |
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568 | TIFFCvtIEEEDoubleToNative(TIFF* tif, u_int n, double* f) |
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569 | { |
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570 | double_t* fp = (double_t*) f; |
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571 | |
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572 | while (n-- > 0) { |
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573 | IEEEDOUBLE2NATIVE(fp); |
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574 | fp++; |
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575 | } |
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576 | } |
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577 | |
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578 | void |
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579 | TIFFCvtNativeToIEEEDouble(TIFF* tif, u_int n, double* f) |
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580 | { |
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581 | double_t* fp = (double_t*) f; |
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582 | |
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583 | while (n-- > 0) { |
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584 | NATIVE2IEEEDOUBLE(fp); |
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585 | fp++; |
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586 | } |
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587 | } |
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588 | #endif |
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