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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 | ssize_t got; |
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67 | |||
68 | if (lseek (descriptor, offset, SEEK_SET) < 0) |
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69 | { |
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70 | *errmsg = "lseek"; |
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71 | *err = errno; |
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72 | return 0; |
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73 | } |
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74 | |||
75 | got = read (descriptor, buffer, size); |
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76 | if (got < 0) |
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77 | { |
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78 | *errmsg = "read"; |
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79 | *err = errno; |
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80 | return 0; |
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81 | } |
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82 | |||
83 | if ((size_t) got < size) |
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84 | { |
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85 | *errmsg = "file too short"; |
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86 | *err = 0; |
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87 | return 0; |
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88 | } |
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89 | |||
90 | return 1; |
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91 | } |
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92 | |||
93 | /* Write data to a file using the simple_object error reporting |
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94 | conventions. */ |
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95 | |||
96 | int |
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97 | simple_object_internal_write (int descriptor, off_t offset, |
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98 | const unsigned char *buffer, size_t size, |
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99 | const char **errmsg, int *err) |
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100 | { |
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101 | ssize_t wrote; |
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102 | |||
103 | if (lseek (descriptor, offset, SEEK_SET) < 0) |
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104 | { |
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105 | *errmsg = "lseek"; |
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106 | *err = errno; |
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107 | return 0; |
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108 | } |
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109 | |||
110 | wrote = write (descriptor, buffer, size); |
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111 | if (wrote < 0) |
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112 | { |
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113 | *errmsg = "write"; |
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114 | *err = errno; |
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115 | return 0; |
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116 | } |
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117 | |||
118 | if ((size_t) wrote < size) |
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119 | { |
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120 | *errmsg = "short write"; |
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121 | *err = 0; |
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122 | return 0; |
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123 | } |
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124 | |||
125 | return 1; |
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126 | } |
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127 | |||
128 | /* Open for read. */ |
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129 | |||
130 | simple_object_read * |
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131 | simple_object_start_read (int descriptor, off_t offset, |
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132 | const char *segment_name, const char **errmsg, |
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133 | int *err) |
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134 | { |
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135 | unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN]; |
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136 | size_t len, i; |
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137 | |||
138 | if (!simple_object_internal_read (descriptor, offset, header, |
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139 | SIMPLE_OBJECT_MATCH_HEADER_LEN, |
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140 | errmsg, err)) |
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141 | return NULL; |
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142 | |||
143 | len = sizeof (format_functions) / sizeof (format_functions[0]); |
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144 | for (i = 0; i < len; ++i) |
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145 | { |
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146 | void *data; |
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147 | |||
148 | data = format_functions[i]->match (header, descriptor, offset, |
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149 | segment_name, errmsg, err); |
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150 | if (data != NULL) |
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151 | { |
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152 | simple_object_read *ret; |
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153 | |||
154 | ret = XNEW (simple_object_read); |
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155 | ret->descriptor = descriptor; |
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156 | ret->offset = offset; |
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157 | ret->functions = format_functions[i]; |
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158 | ret->data = data; |
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159 | return ret; |
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160 | } |
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161 | } |
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162 | |||
163 | *errmsg = "file not recognized"; |
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164 | *err = 0; |
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165 | return NULL; |
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166 | } |
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167 | |||
168 | /* Find all sections. */ |
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169 | |||
170 | const char * |
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171 | simple_object_find_sections (simple_object_read *sobj, |
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172 | int (*pfn) (void *, const char *, off_t, off_t), |
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173 | void *data, |
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174 | int *err) |
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175 | { |
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176 | return sobj->functions->find_sections (sobj, pfn, data, err); |
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177 | } |
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178 | |||
179 | /* Internal data passed to find_one_section. */ |
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180 | |||
181 | struct find_one_section_data |
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182 | { |
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183 | /* The section we are looking for. */ |
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184 | const char *name; |
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185 | /* Where to store the section offset. */ |
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186 | off_t *offset; |
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187 | /* Where to store the section length. */ |
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188 | off_t *length; |
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189 | /* Set if the name is found. */ |
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190 | int found; |
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191 | }; |
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192 | |||
193 | /* Internal function passed to find_sections. */ |
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194 | |||
195 | static int |
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196 | find_one_section (void *data, const char *name, off_t offset, off_t length) |
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197 | { |
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198 | struct find_one_section_data *fosd = (struct find_one_section_data *) data; |
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199 | |||
200 | if (strcmp (name, fosd->name) != 0) |
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201 | return 1; |
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202 | |||
203 | *fosd->offset = offset; |
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204 | *fosd->length = length; |
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205 | fosd->found = 1; |
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206 | |||
207 | /* Stop iteration. */ |
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208 | return 0; |
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209 | } |
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210 | |||
211 | /* Find a section. */ |
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212 | |||
213 | int |
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214 | simple_object_find_section (simple_object_read *sobj, const char *name, |
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215 | off_t *offset, off_t *length, |
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216 | const char **errmsg, int *err) |
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217 | { |
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218 | struct find_one_section_data fosd; |
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219 | |||
220 | fosd.name = name; |
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221 | fosd.offset = offset; |
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222 | fosd.length = length; |
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223 | fosd.found = 0; |
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224 | |||
225 | *errmsg = simple_object_find_sections (sobj, find_one_section, |
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226 | (void *) &fosd, err); |
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227 | if (*errmsg != NULL) |
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228 | return 0; |
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229 | if (!fosd.found) |
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230 | return 0; |
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231 | return 1; |
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232 | } |
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233 | |||
234 | /* Fetch attributes. */ |
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235 | |||
236 | simple_object_attributes * |
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237 | simple_object_fetch_attributes (simple_object_read *sobj, const char **errmsg, |
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238 | int *err) |
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239 | { |
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240 | void *data; |
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241 | simple_object_attributes *ret; |
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242 | |||
243 | data = sobj->functions->fetch_attributes (sobj, errmsg, err); |
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244 | if (data == NULL) |
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245 | return NULL; |
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246 | ret = XNEW (simple_object_attributes); |
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247 | ret->functions = sobj->functions; |
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248 | ret->data = data; |
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249 | return ret; |
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250 | } |
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251 | |||
252 | /* Release an simple_object_read. */ |
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253 | |||
254 | void |
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255 | simple_object_release_read (simple_object_read *sobj) |
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256 | { |
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257 | sobj->functions->release_read (sobj->data); |
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258 | XDELETE (sobj); |
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259 | } |
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260 | |||
261 | /* Merge attributes. */ |
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262 | |||
263 | const char * |
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264 | simple_object_attributes_merge (simple_object_attributes *to, |
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265 | simple_object_attributes *from, |
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266 | int *err) |
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267 | { |
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268 | if (to->functions != from->functions) |
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269 | { |
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270 | *err = 0; |
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271 | return "different object file format"; |
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272 | } |
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273 | return to->functions->attributes_merge (to->data, from->data, err); |
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274 | } |
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275 | |||
276 | /* Release an attributes structure. */ |
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277 | |||
278 | void |
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279 | simple_object_release_attributes (simple_object_attributes *attrs) |
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280 | { |
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281 | attrs->functions->release_attributes (attrs->data); |
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282 | XDELETE (attrs); |
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283 | } |
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284 | |||
285 | /* Start creating an object file. */ |
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286 | |||
287 | simple_object_write * |
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288 | simple_object_start_write (simple_object_attributes *attrs, |
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289 | const char *segment_name, const char **errmsg, |
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290 | int *err) |
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291 | { |
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292 | void *data; |
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293 | simple_object_write *ret; |
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294 | |||
295 | data = attrs->functions->start_write (attrs->data, errmsg, err); |
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296 | if (data == NULL) |
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297 | return NULL; |
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298 | ret = XNEW (simple_object_write); |
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299 | ret->functions = attrs->functions; |
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300 | ret->segment_name = xstrdup (segment_name); |
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301 | ret->sections = NULL; |
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302 | ret->last_section = NULL; |
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303 | ret->data = data; |
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304 | return ret; |
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305 | } |
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306 | |||
307 | /* Start creating a section. */ |
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308 | |||
309 | simple_object_write_section * |
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310 | simple_object_write_create_section (simple_object_write *sobj, const char *name, |
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311 | unsigned int align, |
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312 | const char **errmsg ATTRIBUTE_UNUSED, |
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313 | int *err ATTRIBUTE_UNUSED) |
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314 | { |
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315 | simple_object_write_section *ret; |
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316 | |||
317 | ret = XNEW (simple_object_write_section); |
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318 | ret->next = NULL; |
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319 | ret->name = xstrdup (name); |
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320 | ret->align = align; |
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321 | ret->buffers = NULL; |
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322 | ret->last_buffer = NULL; |
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323 | |||
324 | if (sobj->last_section == NULL) |
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325 | { |
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326 | sobj->sections = ret; |
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327 | sobj->last_section = ret; |
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328 | } |
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329 | else |
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330 | { |
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331 | sobj->last_section->next = ret; |
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332 | sobj->last_section = ret; |
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333 | } |
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334 | |||
335 | return ret; |
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336 | } |
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337 | |||
338 | /* Add data to a section. */ |
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339 | |||
340 | const char * |
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341 | simple_object_write_add_data (simple_object_write *sobj ATTRIBUTE_UNUSED, |
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342 | simple_object_write_section *section, |
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343 | const void *buffer, |
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344 | size_t size, int copy, |
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345 | int *err ATTRIBUTE_UNUSED) |
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346 | { |
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347 | struct simple_object_write_section_buffer *wsb; |
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348 | |||
349 | wsb = XNEW (struct simple_object_write_section_buffer); |
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350 | wsb->next = NULL; |
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351 | wsb->size = size; |
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352 | |||
353 | if (!copy) |
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354 | { |
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355 | wsb->buffer = buffer; |
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356 | wsb->free_buffer = NULL; |
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357 | } |
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358 | else |
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359 | { |
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360 | wsb->free_buffer = (void *) XNEWVEC (char, size); |
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361 | memcpy (wsb->free_buffer, buffer, size); |
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362 | wsb->buffer = wsb->free_buffer; |
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363 | } |
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364 | |||
365 | if (section->last_buffer == NULL) |
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366 | { |
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367 | section->buffers = wsb; |
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368 | section->last_buffer = wsb; |
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369 | } |
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370 | else |
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371 | { |
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372 | section->last_buffer->next = wsb; |
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373 | section->last_buffer = wsb; |
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374 | } |
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375 | |||
376 | return NULL; |
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377 | } |
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378 | |||
379 | /* Write the complete object file. */ |
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380 | |||
381 | const char * |
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382 | simple_object_write_to_file (simple_object_write *sobj, int descriptor, |
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383 | int *err) |
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384 | { |
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385 | return sobj->functions->write_to_file (sobj, descriptor, err); |
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386 | } |
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387 | |||
388 | /* Release an simple_object_write. */ |
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389 | |||
390 | void |
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391 | simple_object_release_write (simple_object_write *sobj) |
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392 | { |
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393 | simple_object_write_section *section; |
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394 | |||
395 | free (sobj->segment_name); |
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396 | |||
397 | section = sobj->sections; |
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398 | while (section != NULL) |
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399 | { |
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400 | struct simple_object_write_section_buffer *buffer; |
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401 | simple_object_write_section *next_section; |
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402 | |||
403 | buffer = section->buffers; |
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404 | while (buffer != NULL) |
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405 | { |
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406 | struct simple_object_write_section_buffer *next_buffer; |
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407 | |||
408 | if (buffer->free_buffer != NULL) |
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409 | XDELETEVEC (buffer->free_buffer); |
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410 | next_buffer = buffer->next; |
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411 | XDELETE (buffer); |
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412 | buffer = next_buffer; |
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413 | } |
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414 | |||
415 | next_section = section->next; |
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416 | free (section->name); |
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417 | XDELETE (section); |
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418 | section = next_section; |
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419 | } |
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420 | |||
421 | sobj->functions->release_write (sobj->data); |
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422 | XDELETE (sobj); |
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423 | }>>>>>>> |