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Rev | Author | Line No. | Line |
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5197 | serge | 1 | /* Low-level I/O routines for BFDs. |
2 | |||
6324 | serge | 3 | Copyright (C) 1990-2015 Free Software Foundation, Inc. |
5197 | serge | 4 | |
5 | Written by Cygnus Support. |
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6 | |||
7 | This file is part of BFD, the Binary File Descriptor library. |
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8 | |||
9 | This program is free software; you can redistribute it and/or modify |
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10 | it under the terms of the GNU General Public License as published by |
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11 | the Free Software Foundation; either version 3 of the License, or |
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12 | (at your option) any later version. |
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13 | |||
14 | This program is distributed in the hope that it will be useful, |
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15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | GNU General Public License for more details. |
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18 | |||
19 | You should have received a copy of the GNU General Public License |
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20 | along with this program; if not, write to the Free Software |
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21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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22 | MA 02110-1301, USA. */ |
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23 | |||
24 | #include "sysdep.h" |
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25 | #include |
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26 | #include "bfd.h" |
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27 | #include "libbfd.h" |
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28 | |||
29 | #ifndef S_IXUSR |
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30 | #define S_IXUSR 0100 /* Execute by owner. */ |
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31 | #endif |
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32 | #ifndef S_IXGRP |
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33 | #define S_IXGRP 0010 /* Execute by group. */ |
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34 | #endif |
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35 | #ifndef S_IXOTH |
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36 | #define S_IXOTH 0001 /* Execute by others. */ |
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37 | #endif |
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38 | |||
39 | #ifndef FD_CLOEXEC |
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40 | #define FD_CLOEXEC 1 |
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41 | #endif |
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42 | |||
43 | file_ptr |
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44 | real_ftell (FILE *file) |
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45 | { |
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46 | #if defined (HAVE_FTELLO64) |
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47 | return ftello64 (file); |
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48 | #elif defined (HAVE_FTELLO) |
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49 | return ftello (file); |
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50 | #else |
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51 | return ftell (file); |
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52 | #endif |
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53 | } |
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54 | |||
55 | int |
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56 | real_fseek (FILE *file, file_ptr offset, int whence) |
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57 | { |
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58 | #if defined (HAVE_FSEEKO64) |
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59 | return fseeko64 (file, offset, whence); |
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60 | #elif defined (HAVE_FSEEKO) |
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61 | return fseeko (file, offset, whence); |
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62 | #else |
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63 | return fseek (file, offset, whence); |
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64 | #endif |
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65 | } |
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66 | |||
67 | /* Mark FILE as close-on-exec. Return FILE. FILE may be NULL, in |
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68 | which case nothing is done. */ |
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69 | static FILE * |
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70 | close_on_exec (FILE *file) |
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71 | { |
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72 | return file; |
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73 | } |
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74 | |||
75 | FILE * |
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76 | real_fopen (const char *filename, const char *modes) |
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77 | { |
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78 | #ifdef VMS |
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79 | char *vms_attr; |
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80 | |||
81 | /* On VMS, fopen allows file attributes as optional arguments. |
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82 | We need to use them but we'd better to use the common prototype. |
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83 | In fopen-vms.h, they are separated from the mode with a comma. |
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84 | Split here. */ |
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85 | vms_attr = strchr (modes, ','); |
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86 | if (vms_attr == NULL) |
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87 | { |
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88 | /* No attributes. */ |
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89 | return close_on_exec (fopen (filename, modes)); |
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90 | } |
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91 | else |
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92 | { |
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93 | /* Attributes found. Split. */ |
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94 | size_t modes_len = strlen (modes) + 1; |
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95 | char attrs[modes_len + 1]; |
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96 | char *at[3]; |
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97 | int i; |
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98 | |||
99 | memcpy (attrs, modes, modes_len); |
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100 | at[0] = attrs; |
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101 | for (i = 0; i < 2; i++) |
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102 | { |
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103 | at[i + 1] = strchr (at[i], ','); |
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104 | BFD_ASSERT (at[i + 1] != NULL); |
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105 | *(at[i + 1]++) = 0; /* Replace ',' with a nul, and skip it. */ |
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106 | } |
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107 | return close_on_exec (fopen (filename, at[0], at[1], at[2])); |
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108 | } |
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109 | #else /* !VMS */ |
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110 | #if defined (HAVE_FOPEN64) |
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111 | return close_on_exec (fopen64 (filename, modes)); |
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112 | #else |
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113 | return close_on_exec (fopen (filename, modes)); |
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114 | #endif |
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115 | #endif /* !VMS */ |
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116 | } |
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117 | |||
118 | /* |
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119 | INTERNAL_DEFINITION |
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120 | struct bfd_iovec |
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121 | |||
122 | DESCRIPTION |
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123 | |||
124 | The < |
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125 | Each < |
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126 | routed through it (it is assumed that the instance implements |
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127 | all methods listed below). |
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128 | |||
129 | .struct bfd_iovec |
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130 | .{ |
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131 | . {* To avoid problems with macros, a "b" rather than "f" |
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132 | . prefix is prepended to each method name. *} |
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133 | . {* Attempt to read/write NBYTES on ABFD's IOSTREAM storing/fetching |
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134 | . bytes starting at PTR. Return the number of bytes actually |
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135 | . transfered (a read past end-of-file returns less than NBYTES), |
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136 | . or -1 (setting < |
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137 | . file_ptr (*bread) (struct bfd *abfd, void *ptr, file_ptr nbytes); |
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138 | . file_ptr (*bwrite) (struct bfd *abfd, const void *ptr, |
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139 | . file_ptr nbytes); |
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140 | . {* Return the current IOSTREAM file offset, or -1 (setting < |
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141 | . if an error occurs. *} |
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142 | . file_ptr (*btell) (struct bfd *abfd); |
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143 | . {* For the following, on successful completion a value of 0 is returned. |
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144 | . Otherwise, a value of -1 is returned (and < |
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145 | . int (*bseek) (struct bfd *abfd, file_ptr offset, int whence); |
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146 | . int (*bclose) (struct bfd *abfd); |
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147 | . int (*bflush) (struct bfd *abfd); |
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148 | . int (*bstat) (struct bfd *abfd, struct stat *sb); |
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149 | . {* Mmap a part of the files. ADDR, LEN, PROT, FLAGS and OFFSET are the usual |
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150 | . mmap parameter, except that LEN and OFFSET do not need to be page |
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151 | . aligned. Returns (void *)-1 on failure, mmapped address on success. |
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152 | . Also write in MAP_ADDR the address of the page aligned buffer and in |
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153 | . MAP_LEN the size mapped (a page multiple). Use unmap with MAP_ADDR and |
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154 | . MAP_LEN to unmap. *} |
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155 | . void *(*bmmap) (struct bfd *abfd, void *addr, bfd_size_type len, |
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156 | . int prot, int flags, file_ptr offset, |
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157 | . void **map_addr, bfd_size_type *map_len); |
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158 | .}; |
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159 | |||
160 | .extern const struct bfd_iovec _bfd_memory_iovec; |
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161 | |||
162 | */ |
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163 | |||
164 | |||
165 | /* Return value is amount read. */ |
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166 | |||
167 | bfd_size_type |
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168 | bfd_bread (void *ptr, bfd_size_type size, bfd *abfd) |
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169 | { |
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170 | size_t nread; |
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171 | |||
172 | /* If this is an archive element, don't read past the end of |
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173 | this element. */ |
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174 | if (abfd->arelt_data != NULL) |
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175 | { |
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176 | bfd_size_type maxbytes = arelt_size (abfd); |
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177 | |||
178 | if (abfd->where + size > maxbytes) |
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179 | { |
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180 | if (abfd->where >= maxbytes) |
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181 | return 0; |
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182 | size = maxbytes - abfd->where; |
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183 | } |
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184 | } |
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185 | |||
186 | if (abfd->iovec) |
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187 | nread = abfd->iovec->bread (abfd, ptr, size); |
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188 | else |
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189 | nread = 0; |
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190 | if (nread != (size_t) -1) |
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191 | abfd->where += nread; |
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192 | |||
193 | return nread; |
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194 | } |
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195 | |||
196 | bfd_size_type |
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197 | bfd_bwrite (const void *ptr, bfd_size_type size, bfd *abfd) |
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198 | { |
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199 | size_t nwrote; |
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200 | |||
201 | if (abfd->iovec) |
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202 | nwrote = abfd->iovec->bwrite (abfd, ptr, size); |
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203 | else |
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204 | nwrote = 0; |
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205 | |||
206 | if (nwrote != (size_t) -1) |
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207 | abfd->where += nwrote; |
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208 | if (nwrote != size) |
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209 | { |
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210 | #ifdef ENOSPC |
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211 | errno = ENOSPC; |
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212 | #endif |
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213 | bfd_set_error (bfd_error_system_call); |
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214 | } |
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215 | return nwrote; |
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216 | } |
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217 | |||
218 | file_ptr |
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219 | bfd_tell (bfd *abfd) |
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220 | { |
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221 | file_ptr ptr; |
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222 | |||
223 | if (abfd->iovec) |
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224 | { |
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225 | bfd *parent_bfd = abfd; |
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226 | ptr = abfd->iovec->btell (abfd); |
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227 | |||
228 | while (parent_bfd->my_archive != NULL) |
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229 | { |
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230 | ptr -= parent_bfd->origin; |
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231 | parent_bfd = parent_bfd->my_archive; |
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232 | } |
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233 | } |
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234 | else |
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235 | ptr = 0; |
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236 | |||
237 | abfd->where = ptr; |
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238 | return ptr; |
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239 | } |
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240 | |||
241 | int |
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242 | bfd_flush (bfd *abfd) |
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243 | { |
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244 | if (abfd->iovec) |
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245 | return abfd->iovec->bflush (abfd); |
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246 | return 0; |
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247 | } |
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248 | |||
249 | /* Returns 0 for success, negative value for failure (in which case |
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250 | bfd_get_error can retrieve the error code). */ |
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251 | int |
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252 | bfd_stat (bfd *abfd, struct stat *statbuf) |
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253 | { |
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254 | int result; |
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255 | |||
256 | if (abfd->iovec) |
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257 | result = abfd->iovec->bstat (abfd, statbuf); |
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258 | else |
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259 | result = -1; |
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260 | |||
261 | if (result < 0) |
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262 | bfd_set_error (bfd_error_system_call); |
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263 | return result; |
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264 | } |
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265 | |||
266 | /* Returns 0 for success, nonzero for failure (in which case bfd_get_error |
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267 | can retrieve the error code). */ |
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268 | |||
269 | int |
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270 | bfd_seek (bfd *abfd, file_ptr position, int direction) |
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271 | { |
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272 | int result; |
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273 | file_ptr file_position; |
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274 | /* For the time being, a BFD may not seek to it's end. The problem |
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275 | is that we don't easily have a way to recognize the end of an |
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276 | element in an archive. */ |
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277 | |||
278 | BFD_ASSERT (direction == SEEK_SET || direction == SEEK_CUR); |
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279 | |||
280 | if (direction == SEEK_CUR && position == 0) |
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281 | return 0; |
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282 | |||
283 | if (abfd->format != bfd_archive && abfd->my_archive == 0) |
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284 | { |
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285 | if (direction == SEEK_SET && (bfd_vma) position == abfd->where) |
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286 | return 0; |
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287 | } |
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288 | else |
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289 | { |
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290 | /* We need something smarter to optimize access to archives. |
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291 | Currently, anything inside an archive is read via the file |
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292 | handle for the archive. Which means that a bfd_seek on one |
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293 | component affects the `current position' in the archive, as |
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294 | well as in any other component. |
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295 | |||
296 | It might be sufficient to put a spike through the cache |
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297 | abstraction, and look to the archive for the file position, |
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298 | but I think we should try for something cleaner. |
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299 | |||
300 | In the meantime, no optimization for archives. */ |
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301 | } |
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302 | |||
303 | file_position = position; |
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304 | if (direction == SEEK_SET) |
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305 | { |
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306 | bfd *parent_bfd = abfd; |
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307 | |||
308 | while (parent_bfd->my_archive != NULL) |
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309 | { |
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310 | file_position += parent_bfd->origin; |
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311 | parent_bfd = parent_bfd->my_archive; |
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312 | } |
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313 | } |
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314 | |||
315 | if (abfd->iovec) |
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316 | result = abfd->iovec->bseek (abfd, file_position, direction); |
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317 | else |
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318 | result = -1; |
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319 | |||
320 | if (result != 0) |
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321 | { |
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322 | int hold_errno = errno; |
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323 | |||
324 | /* Force redetermination of `where' field. */ |
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325 | bfd_tell (abfd); |
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326 | |||
327 | /* An EINVAL error probably means that the file offset was |
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328 | absurd. */ |
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329 | if (hold_errno == EINVAL) |
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330 | bfd_set_error (bfd_error_file_truncated); |
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331 | else |
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332 | { |
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333 | bfd_set_error (bfd_error_system_call); |
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334 | errno = hold_errno; |
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335 | } |
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336 | } |
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337 | else |
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338 | { |
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339 | /* Adjust `where' field. */ |
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340 | if (direction == SEEK_SET) |
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341 | abfd->where = position; |
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342 | else |
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343 | abfd->where += position; |
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344 | } |
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345 | return result; |
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346 | } |
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347 | |||
348 | /* |
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349 | FUNCTION |
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350 | bfd_get_mtime |
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351 | |||
352 | SYNOPSIS |
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353 | long bfd_get_mtime (bfd *abfd); |
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354 | |||
355 | DESCRIPTION |
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356 | Return the file modification time (as read from the file system, or |
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357 | from the archive header for archive members). |
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358 | |||
359 | */ |
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360 | |||
361 | long |
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362 | bfd_get_mtime (bfd *abfd) |
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363 | { |
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364 | struct stat buf; |
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365 | |||
366 | if (abfd->mtime_set) |
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367 | return abfd->mtime; |
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368 | |||
369 | if (abfd->iovec == NULL) |
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370 | return 0; |
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371 | |||
372 | if (abfd->iovec->bstat (abfd, &buf) != 0) |
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373 | return 0; |
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374 | |||
375 | abfd->mtime = buf.st_mtime; /* Save value in case anyone wants it */ |
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376 | return buf.st_mtime; |
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377 | } |
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378 | |||
379 | /* |
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380 | FUNCTION |
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381 | bfd_get_size |
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382 | |||
383 | SYNOPSIS |
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384 | file_ptr bfd_get_size (bfd *abfd); |
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385 | |||
386 | DESCRIPTION |
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387 | Return the file size (as read from file system) for the file |
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388 | associated with BFD @var{abfd}. |
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389 | |||
390 | The initial motivation for, and use of, this routine is not |
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391 | so we can get the exact size of the object the BFD applies to, since |
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392 | that might not be generally possible (archive members for example). |
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393 | It would be ideal if someone could eventually modify |
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394 | it so that such results were guaranteed. |
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395 | |||
396 | Instead, we want to ask questions like "is this NNN byte sized |
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397 | object I'm about to try read from file offset YYY reasonable?" |
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398 | As as example of where we might do this, some object formats |
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399 | use string tables for which the first < |
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400 | table contain the size of the table itself, including the size bytes. |
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401 | If an application tries to read what it thinks is one of these |
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402 | string tables, without some way to validate the size, and for |
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403 | some reason the size is wrong (byte swapping error, wrong location |
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404 | for the string table, etc.), the only clue is likely to be a read |
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405 | error when it tries to read the table, or a "virtual memory |
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406 | exhausted" error when it tries to allocate 15 bazillon bytes |
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407 | of space for the 15 bazillon byte table it is about to read. |
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408 | This function at least allows us to answer the question, "is the |
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409 | size reasonable?". |
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410 | */ |
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411 | |||
412 | file_ptr |
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413 | bfd_get_size (bfd *abfd) |
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414 | { |
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415 | struct stat buf; |
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416 | |||
417 | if (abfd->iovec == NULL) |
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418 | return 0; |
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419 | |||
420 | if (abfd->iovec->bstat (abfd, &buf) != 0) |
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421 | return 0; |
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422 | |||
423 | return buf.st_size; |
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424 | } |
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425 | |||
426 | |||
427 | /* |
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428 | FUNCTION |
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429 | bfd_mmap |
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430 | |||
431 | SYNOPSIS |
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432 | void *bfd_mmap (bfd *abfd, void *addr, bfd_size_type len, |
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433 | int prot, int flags, file_ptr offset, |
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434 | void **map_addr, bfd_size_type *map_len); |
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435 | |||
436 | DESCRIPTION |
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437 | Return mmap()ed region of the file, if possible and implemented. |
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438 | LEN and OFFSET do not need to be page aligned. The page aligned |
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439 | address and length are written to MAP_ADDR and MAP_LEN. |
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440 | |||
441 | */ |
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442 | |||
443 | void * |
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444 | bfd_mmap (bfd *abfd, void *addr, bfd_size_type len, |
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445 | int prot, int flags, file_ptr offset, |
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446 | void **map_addr, bfd_size_type *map_len) |
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447 | { |
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448 | void *ret = (void *)-1; |
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449 | |||
450 | if (abfd->iovec == NULL) |
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451 | return ret; |
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452 | |||
453 | return abfd->iovec->bmmap (abfd, addr, len, prot, flags, offset, |
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454 | map_addr, map_len); |
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455 | } |
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456 | |||
457 | /* Memory file I/O operations. */ |
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458 | |||
459 | static file_ptr |
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460 | memory_bread (bfd *abfd, void *ptr, file_ptr size) |
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461 | { |
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462 | struct bfd_in_memory *bim; |
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463 | bfd_size_type get; |
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464 | |||
465 | bim = (struct bfd_in_memory *) abfd->iostream; |
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466 | get = size; |
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467 | if (abfd->where + get > bim->size) |
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468 | { |
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469 | if (bim->size < (bfd_size_type) abfd->where) |
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470 | get = 0; |
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471 | else |
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472 | get = bim->size - abfd->where; |
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473 | bfd_set_error (bfd_error_file_truncated); |
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474 | } |
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475 | memcpy (ptr, bim->buffer + abfd->where, (size_t) get); |
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476 | return get; |
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477 | } |
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478 | |||
479 | static file_ptr |
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480 | memory_bwrite (bfd *abfd, const void *ptr, file_ptr size) |
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481 | { |
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482 | struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream; |
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483 | |||
484 | if (abfd->where + size > bim->size) |
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485 | { |
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486 | bfd_size_type newsize, oldsize; |
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487 | |||
488 | oldsize = (bim->size + 127) & ~(bfd_size_type) 127; |
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489 | bim->size = abfd->where + size; |
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490 | /* Round up to cut down on memory fragmentation */ |
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491 | newsize = (bim->size + 127) & ~(bfd_size_type) 127; |
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492 | if (newsize > oldsize) |
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493 | { |
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494 | bim->buffer = (bfd_byte *) bfd_realloc_or_free (bim->buffer, newsize); |
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495 | if (bim->buffer == NULL) |
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496 | { |
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497 | bim->size = 0; |
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498 | return 0; |
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499 | } |
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500 | if (newsize > bim->size) |
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501 | memset (bim->buffer + bim->size, 0, newsize - bim->size); |
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502 | } |
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503 | } |
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504 | memcpy (bim->buffer + abfd->where, ptr, (size_t) size); |
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505 | return size; |
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506 | } |
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507 | |||
508 | static file_ptr |
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509 | memory_btell (bfd *abfd) |
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510 | { |
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511 | return abfd->where; |
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512 | } |
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513 | |||
514 | static int |
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515 | memory_bseek (bfd *abfd, file_ptr position, int direction) |
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516 | { |
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517 | file_ptr nwhere; |
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518 | struct bfd_in_memory *bim; |
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519 | |||
520 | bim = (struct bfd_in_memory *) abfd->iostream; |
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521 | |||
522 | if (direction == SEEK_SET) |
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523 | nwhere = position; |
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524 | else |
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525 | nwhere = abfd->where + position; |
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526 | |||
527 | if (nwhere < 0) |
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528 | { |
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529 | abfd->where = 0; |
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530 | errno = EINVAL; |
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531 | return -1; |
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532 | } |
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533 | |||
534 | if ((bfd_size_type)nwhere > bim->size) |
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535 | { |
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536 | if (abfd->direction == write_direction |
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537 | || abfd->direction == both_direction) |
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538 | { |
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539 | bfd_size_type newsize, oldsize; |
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540 | |||
541 | oldsize = (bim->size + 127) & ~(bfd_size_type) 127; |
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542 | bim->size = nwhere; |
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543 | /* Round up to cut down on memory fragmentation */ |
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544 | newsize = (bim->size + 127) & ~(bfd_size_type) 127; |
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545 | if (newsize > oldsize) |
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546 | { |
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547 | bim->buffer = (bfd_byte *) bfd_realloc_or_free (bim->buffer, newsize); |
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548 | if (bim->buffer == NULL) |
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549 | { |
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550 | errno = EINVAL; |
||
551 | bim->size = 0; |
||
552 | return -1; |
||
553 | } |
||
554 | memset (bim->buffer + oldsize, 0, newsize - oldsize); |
||
555 | } |
||
556 | } |
||
557 | else |
||
558 | { |
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559 | abfd->where = bim->size; |
||
560 | errno = EINVAL; |
||
561 | bfd_set_error (bfd_error_file_truncated); |
||
562 | return -1; |
||
563 | } |
||
564 | } |
||
565 | return 0; |
||
566 | } |
||
567 | |||
568 | static int |
||
569 | memory_bclose (struct bfd *abfd) |
||
570 | { |
||
571 | struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream; |
||
572 | |||
573 | if (bim->buffer != NULL) |
||
574 | free (bim->buffer); |
||
575 | free (bim); |
||
576 | abfd->iostream = NULL; |
||
577 | |||
578 | return 0; |
||
579 | } |
||
580 | |||
581 | static int |
||
582 | memory_bflush (bfd *abfd ATTRIBUTE_UNUSED) |
||
583 | { |
||
584 | return 0; |
||
585 | } |
||
586 | |||
587 | static int |
||
588 | memory_bstat (bfd *abfd, struct stat *statbuf) |
||
589 | { |
||
590 | struct bfd_in_memory *bim = (struct bfd_in_memory *) abfd->iostream; |
||
591 | |||
592 | memset (statbuf, 0, sizeof (*statbuf)); |
||
593 | statbuf->st_size = bim->size; |
||
594 | |||
595 | return 0; |
||
596 | } |
||
597 | |||
598 | static void * |
||
599 | memory_bmmap (bfd *abfd ATTRIBUTE_UNUSED, void *addr ATTRIBUTE_UNUSED, |
||
600 | bfd_size_type len ATTRIBUTE_UNUSED, int prot ATTRIBUTE_UNUSED, |
||
601 | int flags ATTRIBUTE_UNUSED, file_ptr offset ATTRIBUTE_UNUSED, |
||
602 | void **map_addr ATTRIBUTE_UNUSED, |
||
603 | bfd_size_type *map_len ATTRIBUTE_UNUSED) |
||
604 | { |
||
605 | return (void *)-1; |
||
606 | } |
||
607 | |||
608 | const struct bfd_iovec _bfd_memory_iovec = |
||
609 | { |
||
610 | &memory_bread, &memory_bwrite, &memory_btell, &memory_bseek, |
||
611 | &memory_bclose, &memory_bflush, &memory_bstat, &memory_bmmap |
||
612 | };>> |