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5191 | serge | 1 | /* simple-object.c -- simple routines to read and write object files. |
2 | Copyright 2010 Free Software Foundation, Inc. |
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3 | Written by Ian Lance Taylor, Google. |
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4 | |||
5 | This program is free software; you can redistribute it and/or modify it |
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6 | under the terms of the GNU General Public License as published by the |
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7 | Free Software Foundation; either version 2, or (at your option) any |
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8 | 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, 51 Franklin Street - Fifth Floor, |
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18 | Boston, MA 02110-1301, USA. */ |
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19 | |||
20 | #include "config.h" |
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21 | #include "libiberty.h" |
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22 | #include "simple-object.h" |
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23 | |||
24 | #include |
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25 | |||
26 | #ifdef HAVE_STDLIB_H |
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27 | #include |
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28 | #endif |
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29 | |||
30 | #ifdef HAVE_STDINT_H |
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31 | #include |
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32 | #endif |
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33 | |||
34 | #ifdef HAVE_STRING_H |
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35 | #include |
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36 | #endif |
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37 | |||
38 | #ifdef HAVE_INTTYPES_H |
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39 | #include |
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40 | #endif |
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41 | |||
42 | #ifndef SEEK_SET |
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43 | #define SEEK_SET 0 |
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44 | #endif |
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45 | |||
46 | #include "simple-object-common.h" |
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47 | |||
48 | /* The known object file formats. */ |
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49 | |||
50 | static const struct simple_object_functions * const format_functions[] = |
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51 | { |
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52 | &simple_object_elf_functions, |
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53 | &simple_object_mach_o_functions, |
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54 | &simple_object_coff_functions, |
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55 | &simple_object_xcoff_functions |
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56 | }; |
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57 | |||
58 | /* Read data from a file using the simple_object error reporting |
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59 | conventions. */ |
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60 | |||
61 | int |
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62 | simple_object_internal_read (int descriptor, off_t offset, |
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63 | unsigned char *buffer, size_t size, |
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64 | const char **errmsg, int *err) |
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65 | { |
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66 | if (lseek (descriptor, offset, SEEK_SET) < 0) |
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67 | { |
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68 | *errmsg = "lseek"; |
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69 | *err = errno; |
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70 | return 0; |
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71 | } |
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72 | |||
6324 | serge | 73 | do |
5191 | serge | 74 | { |
6324 | serge | 75 | ssize_t got = read (descriptor, buffer, size); |
76 | if (got == 0) |
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77 | break; |
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78 | else if (got > 0) |
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79 | { |
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80 | buffer += got; |
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81 | size -= got; |
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82 | } |
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83 | else if (errno != EINTR) |
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84 | { |
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5191 | serge | 85 | *errmsg = "read"; |
86 | *err = errno; |
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87 | return 0; |
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88 | } |
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6324 | serge | 89 | } |
90 | while (size > 0); |
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5191 | serge | 91 | |
6324 | serge | 92 | if (size > 0) |
5191 | serge | 93 | { |
94 | *errmsg = "file too short"; |
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95 | *err = 0; |
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96 | return 0; |
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97 | } |
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98 | |||
99 | return 1; |
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100 | } |
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101 | |||
102 | /* Write data to a file using the simple_object error reporting |
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103 | conventions. */ |
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104 | |||
105 | int |
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106 | simple_object_internal_write (int descriptor, off_t offset, |
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107 | const unsigned char *buffer, size_t size, |
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108 | const char **errmsg, int *err) |
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109 | { |
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110 | if (lseek (descriptor, offset, SEEK_SET) < 0) |
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111 | { |
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112 | *errmsg = "lseek"; |
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113 | *err = errno; |
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114 | return 0; |
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115 | } |
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116 | |||
6324 | serge | 117 | do |
5191 | serge | 118 | { |
6324 | serge | 119 | ssize_t wrote = write (descriptor, buffer, size); |
120 | if (wrote == 0) |
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121 | break; |
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122 | else if (wrote > 0) |
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123 | { |
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124 | buffer += wrote; |
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125 | size -= wrote; |
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126 | } |
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127 | else if (errno != EINTR) |
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128 | { |
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5191 | serge | 129 | *errmsg = "write"; |
130 | *err = errno; |
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131 | return 0; |
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132 | } |
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6324 | serge | 133 | } |
134 | while (size > 0); |
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5191 | serge | 135 | |
6324 | serge | 136 | if (size > 0) |
5191 | serge | 137 | { |
138 | *errmsg = "short write"; |
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139 | *err = 0; |
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140 | return 0; |
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141 | } |
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142 | |||
143 | return 1; |
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144 | } |
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145 | |||
146 | /* Open for read. */ |
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147 | |||
148 | simple_object_read * |
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149 | simple_object_start_read (int descriptor, off_t offset, |
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150 | const char *segment_name, const char **errmsg, |
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151 | int *err) |
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152 | { |
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153 | unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN]; |
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154 | size_t len, i; |
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155 | |||
156 | if (!simple_object_internal_read (descriptor, offset, header, |
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157 | SIMPLE_OBJECT_MATCH_HEADER_LEN, |
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158 | errmsg, err)) |
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159 | return NULL; |
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160 | |||
161 | len = sizeof (format_functions) / sizeof (format_functions[0]); |
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162 | for (i = 0; i < len; ++i) |
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163 | { |
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164 | void *data; |
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165 | |||
166 | data = format_functions[i]->match (header, descriptor, offset, |
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167 | segment_name, errmsg, err); |
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168 | if (data != NULL) |
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169 | { |
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170 | simple_object_read *ret; |
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171 | |||
172 | ret = XNEW (simple_object_read); |
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173 | ret->descriptor = descriptor; |
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174 | ret->offset = offset; |
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175 | ret->functions = format_functions[i]; |
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176 | ret->data = data; |
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177 | return ret; |
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178 | } |
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179 | } |
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180 | |||
181 | *errmsg = "file not recognized"; |
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182 | *err = 0; |
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183 | return NULL; |
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184 | } |
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185 | |||
186 | /* Find all sections. */ |
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187 | |||
188 | const char * |
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189 | simple_object_find_sections (simple_object_read *sobj, |
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190 | int (*pfn) (void *, const char *, off_t, off_t), |
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191 | void *data, |
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192 | int *err) |
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193 | { |
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194 | return sobj->functions->find_sections (sobj, pfn, data, err); |
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195 | } |
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196 | |||
197 | /* Internal data passed to find_one_section. */ |
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198 | |||
199 | struct find_one_section_data |
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200 | { |
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201 | /* The section we are looking for. */ |
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202 | const char *name; |
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203 | /* Where to store the section offset. */ |
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204 | off_t *offset; |
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205 | /* Where to store the section length. */ |
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206 | off_t *length; |
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207 | /* Set if the name is found. */ |
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208 | int found; |
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209 | }; |
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210 | |||
211 | /* Internal function passed to find_sections. */ |
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212 | |||
213 | static int |
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214 | find_one_section (void *data, const char *name, off_t offset, off_t length) |
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215 | { |
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216 | struct find_one_section_data *fosd = (struct find_one_section_data *) data; |
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217 | |||
218 | if (strcmp (name, fosd->name) != 0) |
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219 | return 1; |
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220 | |||
221 | *fosd->offset = offset; |
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222 | *fosd->length = length; |
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223 | fosd->found = 1; |
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224 | |||
225 | /* Stop iteration. */ |
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226 | return 0; |
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227 | } |
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228 | |||
229 | /* Find a section. */ |
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230 | |||
231 | int |
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232 | simple_object_find_section (simple_object_read *sobj, const char *name, |
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233 | off_t *offset, off_t *length, |
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234 | const char **errmsg, int *err) |
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235 | { |
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236 | struct find_one_section_data fosd; |
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237 | |||
238 | fosd.name = name; |
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239 | fosd.offset = offset; |
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240 | fosd.length = length; |
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241 | fosd.found = 0; |
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242 | |||
243 | *errmsg = simple_object_find_sections (sobj, find_one_section, |
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244 | (void *) &fosd, err); |
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245 | if (*errmsg != NULL) |
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246 | return 0; |
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247 | if (!fosd.found) |
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248 | return 0; |
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249 | return 1; |
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250 | } |
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251 | |||
252 | /* Fetch attributes. */ |
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253 | |||
254 | simple_object_attributes * |
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255 | simple_object_fetch_attributes (simple_object_read *sobj, const char **errmsg, |
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256 | int *err) |
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257 | { |
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258 | void *data; |
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259 | simple_object_attributes *ret; |
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260 | |||
261 | data = sobj->functions->fetch_attributes (sobj, errmsg, err); |
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262 | if (data == NULL) |
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263 | return NULL; |
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264 | ret = XNEW (simple_object_attributes); |
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265 | ret->functions = sobj->functions; |
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266 | ret->data = data; |
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267 | return ret; |
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268 | } |
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269 | |||
270 | /* Release an simple_object_read. */ |
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271 | |||
272 | void |
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273 | simple_object_release_read (simple_object_read *sobj) |
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274 | { |
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275 | sobj->functions->release_read (sobj->data); |
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276 | XDELETE (sobj); |
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277 | } |
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278 | |||
279 | /* Merge attributes. */ |
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280 | |||
281 | const char * |
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282 | simple_object_attributes_merge (simple_object_attributes *to, |
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283 | simple_object_attributes *from, |
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284 | int *err) |
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285 | { |
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286 | if (to->functions != from->functions) |
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287 | { |
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288 | *err = 0; |
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289 | return "different object file format"; |
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290 | } |
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291 | return to->functions->attributes_merge (to->data, from->data, err); |
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292 | } |
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293 | |||
294 | /* Release an attributes structure. */ |
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295 | |||
296 | void |
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297 | simple_object_release_attributes (simple_object_attributes *attrs) |
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298 | { |
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299 | attrs->functions->release_attributes (attrs->data); |
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300 | XDELETE (attrs); |
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301 | } |
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302 | |||
303 | /* Start creating an object file. */ |
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304 | |||
305 | simple_object_write * |
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306 | simple_object_start_write (simple_object_attributes *attrs, |
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307 | const char *segment_name, const char **errmsg, |
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308 | int *err) |
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309 | { |
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310 | void *data; |
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311 | simple_object_write *ret; |
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312 | |||
313 | data = attrs->functions->start_write (attrs->data, errmsg, err); |
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314 | if (data == NULL) |
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315 | return NULL; |
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316 | ret = XNEW (simple_object_write); |
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317 | ret->functions = attrs->functions; |
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318 | ret->segment_name = xstrdup (segment_name); |
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319 | ret->sections = NULL; |
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320 | ret->last_section = NULL; |
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321 | ret->data = data; |
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322 | return ret; |
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323 | } |
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324 | |||
325 | /* Start creating a section. */ |
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326 | |||
327 | simple_object_write_section * |
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328 | simple_object_write_create_section (simple_object_write *sobj, const char *name, |
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329 | unsigned int align, |
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330 | const char **errmsg ATTRIBUTE_UNUSED, |
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331 | int *err ATTRIBUTE_UNUSED) |
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332 | { |
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333 | simple_object_write_section *ret; |
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334 | |||
335 | ret = XNEW (simple_object_write_section); |
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336 | ret->next = NULL; |
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337 | ret->name = xstrdup (name); |
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338 | ret->align = align; |
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339 | ret->buffers = NULL; |
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340 | ret->last_buffer = NULL; |
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341 | |||
342 | if (sobj->last_section == NULL) |
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343 | { |
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344 | sobj->sections = ret; |
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345 | sobj->last_section = ret; |
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346 | } |
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347 | else |
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348 | { |
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349 | sobj->last_section->next = ret; |
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350 | sobj->last_section = ret; |
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351 | } |
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352 | |||
353 | return ret; |
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354 | } |
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355 | |||
356 | /* Add data to a section. */ |
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357 | |||
358 | const char * |
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359 | simple_object_write_add_data (simple_object_write *sobj ATTRIBUTE_UNUSED, |
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360 | simple_object_write_section *section, |
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361 | const void *buffer, |
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362 | size_t size, int copy, |
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363 | int *err ATTRIBUTE_UNUSED) |
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364 | { |
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365 | struct simple_object_write_section_buffer *wsb; |
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366 | |||
367 | wsb = XNEW (struct simple_object_write_section_buffer); |
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368 | wsb->next = NULL; |
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369 | wsb->size = size; |
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370 | |||
371 | if (!copy) |
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372 | { |
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373 | wsb->buffer = buffer; |
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374 | wsb->free_buffer = NULL; |
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375 | } |
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376 | else |
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377 | { |
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378 | wsb->free_buffer = (void *) XNEWVEC (char, size); |
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379 | memcpy (wsb->free_buffer, buffer, size); |
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380 | wsb->buffer = wsb->free_buffer; |
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381 | } |
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382 | |||
383 | if (section->last_buffer == NULL) |
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384 | { |
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385 | section->buffers = wsb; |
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386 | section->last_buffer = wsb; |
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387 | } |
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388 | else |
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389 | { |
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390 | section->last_buffer->next = wsb; |
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391 | section->last_buffer = wsb; |
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392 | } |
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393 | |||
394 | return NULL; |
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395 | } |
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396 | |||
397 | /* Write the complete object file. */ |
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398 | |||
399 | const char * |
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400 | simple_object_write_to_file (simple_object_write *sobj, int descriptor, |
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401 | int *err) |
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402 | { |
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403 | return sobj->functions->write_to_file (sobj, descriptor, err); |
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404 | } |
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405 | |||
406 | /* Release an simple_object_write. */ |
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407 | |||
408 | void |
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409 | simple_object_release_write (simple_object_write *sobj) |
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410 | { |
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411 | simple_object_write_section *section; |
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412 | |||
413 | free (sobj->segment_name); |
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414 | |||
415 | section = sobj->sections; |
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416 | while (section != NULL) |
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417 | { |
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418 | struct simple_object_write_section_buffer *buffer; |
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419 | simple_object_write_section *next_section; |
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420 | |||
421 | buffer = section->buffers; |
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422 | while (buffer != NULL) |
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423 | { |
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424 | struct simple_object_write_section_buffer *next_buffer; |
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425 | |||
426 | if (buffer->free_buffer != NULL) |
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427 | XDELETEVEC (buffer->free_buffer); |
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428 | next_buffer = buffer->next; |
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429 | XDELETE (buffer); |
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430 | buffer = next_buffer; |
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431 | } |
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432 | |||
433 | next_section = section->next; |
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434 | free (section->name); |
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435 | XDELETE (section); |
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436 | section = next_section; |
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437 | } |
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438 | |||
439 | sobj->functions->release_write (sobj->data); |
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440 | XDELETE (sobj); |
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441 | }>>> |