license.bot | f003cfe | 2008-08-24 09:55:55 +0900 | [diff] [blame^] | 1 | // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 4 | |
| 5 | // This file implements PEImage, a generic class to manipulate PE files. |
| 6 | // This file was adapted from GreenBorder's Code. |
| 7 | |
| 8 | #include "base/pe_image.h" |
| 9 | |
maruel@google.com | a855b0f | 2008-07-30 22:02:03 +0900 | [diff] [blame] | 10 | #ifdef _WIN64 |
| 11 | #error This code is not tested on x64. Please make sure all the base unit tests\ |
| 12 | pass before doing any real work. The current unit tests don't test the\ |
| 13 | differences between 32- and 64-bits implementations. Bugs may slip through.\ |
| 14 | You need to improve the coverage before continuing. |
| 15 | #endif |
| 16 | |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 17 | // Structure to perform imports enumerations. |
| 18 | struct EnumAllImportsStorage { |
| 19 | PEImage::EnumImportsFunction callback; |
| 20 | PVOID cookie; |
| 21 | }; |
| 22 | |
| 23 | // Callback used to enumerate imports. See EnumImportChunksFunction. |
| 24 | bool ProcessImportChunk(const PEImage &image, LPCSTR module, |
| 25 | PIMAGE_THUNK_DATA name_table, |
| 26 | PIMAGE_THUNK_DATA iat, PVOID cookie) { |
| 27 | EnumAllImportsStorage &storage = *reinterpret_cast<EnumAllImportsStorage*>( |
| 28 | cookie); |
| 29 | |
| 30 | return image.EnumOneImportChunk(storage.callback, module, name_table, iat, |
| 31 | storage.cookie); |
| 32 | } |
| 33 | |
| 34 | // Callback used to enumerate delay imports. See EnumDelayImportChunksFunction. |
| 35 | bool ProcessDelayImportChunk(const PEImage &image, |
| 36 | PImgDelayDescr delay_descriptor, |
| 37 | LPCSTR module, PIMAGE_THUNK_DATA name_table, |
| 38 | PIMAGE_THUNK_DATA iat, PIMAGE_THUNK_DATA bound_iat, |
| 39 | PIMAGE_THUNK_DATA unload_iat, PVOID cookie) { |
| 40 | EnumAllImportsStorage &storage = *reinterpret_cast<EnumAllImportsStorage*>( |
| 41 | cookie); |
| 42 | |
| 43 | return image.EnumOneDelayImportChunk(storage.callback, delay_descriptor, |
| 44 | module, name_table, iat, bound_iat, |
| 45 | unload_iat, storage.cookie); |
| 46 | } |
| 47 | |
| 48 | void PEImage::set_module(HMODULE module) { |
| 49 | module_ = module; |
| 50 | } |
| 51 | |
| 52 | PIMAGE_DOS_HEADER PEImage::GetDosHeader() const { |
| 53 | return reinterpret_cast<PIMAGE_DOS_HEADER>(module_); |
| 54 | } |
| 55 | |
| 56 | PIMAGE_NT_HEADERS PEImage::GetNTHeaders() const { |
| 57 | PIMAGE_DOS_HEADER dos_header = GetDosHeader(); |
| 58 | |
| 59 | return reinterpret_cast<PIMAGE_NT_HEADERS>( |
| 60 | reinterpret_cast<char*>(dos_header) + dos_header->e_lfanew); |
| 61 | } |
| 62 | |
| 63 | PIMAGE_SECTION_HEADER PEImage::GetSectionHeader(UINT section) const { |
| 64 | PIMAGE_NT_HEADERS nt_headers = GetNTHeaders(); |
| 65 | PIMAGE_SECTION_HEADER first_section = IMAGE_FIRST_SECTION(nt_headers); |
| 66 | |
| 67 | if (section < nt_headers->FileHeader.NumberOfSections) |
| 68 | return first_section + section; |
| 69 | else |
| 70 | return NULL; |
| 71 | } |
| 72 | |
| 73 | WORD PEImage::GetNumSections() const { |
| 74 | return GetNTHeaders()->FileHeader.NumberOfSections; |
| 75 | } |
| 76 | |
| 77 | DWORD PEImage::GetImageDirectoryEntrySize(UINT directory) const { |
| 78 | PIMAGE_NT_HEADERS nt_headers = GetNTHeaders(); |
| 79 | |
| 80 | return nt_headers->OptionalHeader.DataDirectory[directory].Size; |
| 81 | } |
| 82 | |
| 83 | PVOID PEImage::GetImageDirectoryEntryAddr(UINT directory) const { |
| 84 | PIMAGE_NT_HEADERS nt_headers = GetNTHeaders(); |
| 85 | |
| 86 | return RVAToAddr( |
| 87 | nt_headers->OptionalHeader.DataDirectory[directory].VirtualAddress); |
| 88 | } |
| 89 | |
| 90 | PIMAGE_SECTION_HEADER PEImage::GetImageSectionFromAddr(PVOID address) const { |
| 91 | PBYTE target = reinterpret_cast<PBYTE>(address); |
| 92 | PIMAGE_SECTION_HEADER section; |
| 93 | |
| 94 | for (UINT i = 0; NULL != (section = GetSectionHeader(i)); i++) { |
| 95 | // Don't use the virtual RVAToAddr. |
| 96 | PBYTE start = reinterpret_cast<PBYTE>( |
| 97 | PEImage::RVAToAddr(section->VirtualAddress)); |
| 98 | |
| 99 | DWORD size = section->Misc.VirtualSize; |
| 100 | |
| 101 | if ((start <= target) && (start + size > target)) |
| 102 | return section; |
| 103 | } |
| 104 | |
| 105 | return NULL; |
| 106 | } |
| 107 | |
| 108 | PIMAGE_SECTION_HEADER PEImage::GetImageSectionHeaderByName( |
| 109 | LPCSTR section_name) const { |
| 110 | if (NULL == section_name) |
| 111 | return NULL; |
| 112 | |
| 113 | PIMAGE_SECTION_HEADER ret = NULL; |
| 114 | int num_sections = GetNumSections(); |
| 115 | |
| 116 | for (int i = 0; i < num_sections; i++) { |
| 117 | PIMAGE_SECTION_HEADER section = GetSectionHeader(i); |
| 118 | if (0 == _strnicmp(reinterpret_cast<LPCSTR>(section->Name), section_name, |
| 119 | sizeof(section->Name))) { |
| 120 | ret = section; |
| 121 | break; |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | return ret; |
| 126 | } |
| 127 | |
| 128 | PDWORD PEImage::GetExportEntry(LPCSTR name) const { |
| 129 | PIMAGE_EXPORT_DIRECTORY exports = GetExportDirectory(); |
| 130 | |
| 131 | if (NULL == exports) |
| 132 | return NULL; |
| 133 | |
| 134 | WORD ordinal = 0; |
| 135 | if (!GetProcOrdinal(name, &ordinal)) |
| 136 | return NULL; |
| 137 | |
| 138 | PDWORD functions = reinterpret_cast<PDWORD>( |
| 139 | RVAToAddr(exports->AddressOfFunctions)); |
| 140 | |
| 141 | return functions + ordinal - exports->Base; |
| 142 | } |
| 143 | |
| 144 | FARPROC PEImage::GetProcAddress(LPCSTR function_name) const { |
| 145 | PDWORD export_entry = GetExportEntry(function_name); |
| 146 | if (NULL == export_entry) |
| 147 | return NULL; |
| 148 | |
| 149 | PBYTE function = reinterpret_cast<PBYTE>(RVAToAddr(*export_entry)); |
| 150 | |
| 151 | PBYTE exports = reinterpret_cast<PBYTE>( |
| 152 | GetImageDirectoryEntryAddr(IMAGE_DIRECTORY_ENTRY_EXPORT)); |
| 153 | DWORD size = GetImageDirectoryEntrySize(IMAGE_DIRECTORY_ENTRY_EXPORT); |
| 154 | |
| 155 | // Check for forwarded exports as a special case. |
| 156 | if (exports <= function && exports + size > function) |
| 157 | #pragma warning(push) |
| 158 | #pragma warning(disable: 4312) |
| 159 | // This cast generates a warning because it is 32 bit specific. |
| 160 | return reinterpret_cast<FARPROC>(0xFFFFFFFF); |
| 161 | #pragma warning(pop) |
| 162 | |
| 163 | return reinterpret_cast<FARPROC>(function); |
| 164 | } |
| 165 | |
| 166 | bool PEImage::GetProcOrdinal(LPCSTR function_name, WORD *ordinal) const { |
| 167 | if (NULL == ordinal) |
| 168 | return false; |
| 169 | |
| 170 | PIMAGE_EXPORT_DIRECTORY exports = GetExportDirectory(); |
| 171 | |
| 172 | if (NULL == exports) |
| 173 | return false; |
| 174 | |
| 175 | if (IsOrdinal(function_name)) { |
| 176 | *ordinal = ToOrdinal(function_name); |
| 177 | } else { |
| 178 | PDWORD names = reinterpret_cast<PDWORD>(RVAToAddr(exports->AddressOfNames)); |
| 179 | PDWORD lower = names; |
| 180 | PDWORD upper = names + exports->NumberOfNames; |
| 181 | int cmp = -1; |
| 182 | |
| 183 | // Binary Search for the name. |
| 184 | while (lower != upper) { |
| 185 | PDWORD middle = lower + (upper - lower) / 2; |
| 186 | LPCSTR name = reinterpret_cast<LPCSTR>(RVAToAddr(*middle)); |
| 187 | |
| 188 | cmp = strcmp(function_name, name); |
| 189 | |
| 190 | if (cmp == 0) { |
| 191 | lower = middle; |
| 192 | break; |
| 193 | } |
| 194 | |
| 195 | if (cmp > 0) |
| 196 | lower = middle + 1; |
| 197 | else |
| 198 | upper = middle; |
| 199 | } |
| 200 | |
| 201 | if (cmp != 0) |
| 202 | return false; |
| 203 | |
| 204 | |
| 205 | PWORD ordinals = reinterpret_cast<PWORD>( |
| 206 | RVAToAddr(exports->AddressOfNameOrdinals)); |
| 207 | |
| 208 | *ordinal = ordinals[lower - names] + static_cast<WORD>(exports->Base); |
| 209 | } |
| 210 | |
| 211 | return true; |
| 212 | } |
| 213 | |
| 214 | bool PEImage::EnumSections(EnumSectionsFunction callback, PVOID cookie) const { |
| 215 | PIMAGE_NT_HEADERS nt_headers = GetNTHeaders(); |
| 216 | UINT num_sections = nt_headers->FileHeader.NumberOfSections; |
| 217 | PIMAGE_SECTION_HEADER section = GetSectionHeader(0); |
| 218 | |
| 219 | for (UINT i = 0; i < num_sections; i++, section++) { |
| 220 | PVOID section_start = RVAToAddr(section->VirtualAddress); |
| 221 | DWORD size = section->Misc.VirtualSize; |
| 222 | |
| 223 | if (!callback(*this, section, section_start, size, cookie)) |
| 224 | return false; |
| 225 | } |
| 226 | |
| 227 | return true; |
| 228 | } |
| 229 | |
| 230 | bool PEImage::EnumExports(EnumExportsFunction callback, PVOID cookie) const { |
| 231 | PVOID directory = GetImageDirectoryEntryAddr(IMAGE_DIRECTORY_ENTRY_EXPORT); |
| 232 | DWORD size = GetImageDirectoryEntrySize(IMAGE_DIRECTORY_ENTRY_EXPORT); |
| 233 | |
| 234 | // Check if there are any exports at all. |
| 235 | if (NULL == directory || 0 == size) |
| 236 | return true; |
| 237 | |
| 238 | PIMAGE_EXPORT_DIRECTORY exports = reinterpret_cast<PIMAGE_EXPORT_DIRECTORY>( |
| 239 | directory); |
| 240 | UINT ordinal_base = exports->Base; |
| 241 | UINT num_funcs = exports->NumberOfFunctions; |
| 242 | UINT num_names = exports->NumberOfNames; |
| 243 | PDWORD functions = reinterpret_cast<PDWORD>(RVAToAddr( |
| 244 | exports->AddressOfFunctions)); |
| 245 | PDWORD names = reinterpret_cast<PDWORD>(RVAToAddr(exports->AddressOfNames)); |
| 246 | PWORD ordinals = reinterpret_cast<PWORD>(RVAToAddr( |
| 247 | exports->AddressOfNameOrdinals)); |
| 248 | |
| 249 | for (UINT count = 0; count < num_funcs; count++) { |
| 250 | PVOID func = RVAToAddr(functions[count]); |
| 251 | if (NULL == func) |
| 252 | continue; |
| 253 | |
| 254 | // Check for a name. |
| 255 | LPCSTR name = NULL; |
| 256 | UINT hint; |
| 257 | for (hint = 0; hint < num_names; hint++) { |
| 258 | if (ordinals[hint] == count) { |
| 259 | name = reinterpret_cast<LPCSTR>(RVAToAddr(names[hint])); |
| 260 | break; |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | if (name == NULL) |
| 265 | hint = 0; |
| 266 | |
| 267 | // Check for forwarded exports. |
| 268 | LPCSTR forward = NULL; |
| 269 | if (reinterpret_cast<char*>(func) >= reinterpret_cast<char*>(directory) && |
| 270 | reinterpret_cast<char*>(func) <= reinterpret_cast<char*>(directory) + |
| 271 | size) { |
| 272 | forward = reinterpret_cast<LPCSTR>(func); |
| 273 | func = 0; |
| 274 | } |
| 275 | |
| 276 | if (!callback(*this, ordinal_base + count, hint, name, func, forward, |
| 277 | cookie)) |
| 278 | return false; |
| 279 | } |
| 280 | |
| 281 | return true; |
| 282 | } |
| 283 | |
| 284 | bool PEImage::EnumRelocs(EnumRelocsFunction callback, PVOID cookie) const { |
| 285 | PVOID directory = GetImageDirectoryEntryAddr(IMAGE_DIRECTORY_ENTRY_BASERELOC); |
| 286 | DWORD size = GetImageDirectoryEntrySize(IMAGE_DIRECTORY_ENTRY_BASERELOC); |
| 287 | PIMAGE_BASE_RELOCATION base = reinterpret_cast<PIMAGE_BASE_RELOCATION>( |
| 288 | directory); |
| 289 | |
| 290 | if (directory == NULL || size < sizeof(IMAGE_BASE_RELOCATION)) |
| 291 | return true; |
| 292 | |
| 293 | while (base->SizeOfBlock) { |
| 294 | PWORD reloc = reinterpret_cast<PWORD>(base + 1); |
| 295 | UINT num_relocs = (base->SizeOfBlock - sizeof(IMAGE_BASE_RELOCATION)) / |
| 296 | sizeof(WORD); |
| 297 | |
| 298 | for (UINT i = 0; i < num_relocs; i++, reloc++) { |
| 299 | WORD type = *reloc >> 12; |
| 300 | PVOID address = RVAToAddr(base->VirtualAddress + (*reloc & 0x0FFF)); |
| 301 | |
| 302 | if (!callback(*this, type, address, cookie)) |
| 303 | return false; |
| 304 | } |
| 305 | |
| 306 | base = reinterpret_cast<PIMAGE_BASE_RELOCATION>( |
| 307 | reinterpret_cast<char*>(base) + base->SizeOfBlock); |
| 308 | } |
| 309 | |
| 310 | return true; |
| 311 | } |
| 312 | |
| 313 | bool PEImage::EnumImportChunks(EnumImportChunksFunction callback, |
| 314 | PVOID cookie) const { |
| 315 | DWORD size = GetImageDirectoryEntrySize(IMAGE_DIRECTORY_ENTRY_IMPORT); |
| 316 | PIMAGE_IMPORT_DESCRIPTOR import = GetFirstImportChunk(); |
| 317 | |
| 318 | if (import == NULL || size < sizeof(IMAGE_IMPORT_DESCRIPTOR)) |
| 319 | return true; |
| 320 | |
| 321 | for (; import->FirstThunk; import++) { |
| 322 | LPCSTR module_name = reinterpret_cast<LPCSTR>(RVAToAddr(import->Name)); |
| 323 | PIMAGE_THUNK_DATA name_table = reinterpret_cast<PIMAGE_THUNK_DATA>( |
| 324 | RVAToAddr(import->OriginalFirstThunk)); |
| 325 | PIMAGE_THUNK_DATA iat = reinterpret_cast<PIMAGE_THUNK_DATA>( |
| 326 | RVAToAddr(import->FirstThunk)); |
| 327 | |
| 328 | if (!callback(*this, module_name, name_table, iat, cookie)) |
| 329 | return false; |
| 330 | } |
| 331 | |
| 332 | return true; |
| 333 | } |
| 334 | |
| 335 | bool PEImage::EnumOneImportChunk(EnumImportsFunction callback, |
| 336 | LPCSTR module_name, |
| 337 | PIMAGE_THUNK_DATA name_table, |
| 338 | PIMAGE_THUNK_DATA iat, PVOID cookie) const { |
| 339 | if (NULL == name_table) |
| 340 | return false; |
| 341 | |
| 342 | for (; name_table && name_table->u1.Ordinal; name_table++, iat++) { |
| 343 | LPCSTR name = NULL; |
| 344 | WORD ordinal = 0; |
| 345 | WORD hint = 0; |
| 346 | |
| 347 | if (IMAGE_SNAP_BY_ORDINAL(name_table->u1.Ordinal)) { |
| 348 | ordinal = static_cast<WORD>(IMAGE_ORDINAL32(name_table->u1.Ordinal)); |
| 349 | } else { |
| 350 | PIMAGE_IMPORT_BY_NAME import = reinterpret_cast<PIMAGE_IMPORT_BY_NAME>( |
| 351 | RVAToAddr(name_table->u1.ForwarderString)); |
| 352 | |
| 353 | hint = import->Hint; |
| 354 | name = reinterpret_cast<LPCSTR>(&import->Name); |
| 355 | } |
| 356 | |
| 357 | if (!callback(*this, module_name, ordinal, name, hint, iat, cookie)) |
| 358 | return false; |
| 359 | } |
| 360 | |
| 361 | return true; |
| 362 | } |
| 363 | |
| 364 | bool PEImage::EnumAllImports(EnumImportsFunction callback, PVOID cookie) const { |
| 365 | EnumAllImportsStorage temp = { callback, cookie }; |
| 366 | return EnumImportChunks(ProcessImportChunk, &temp); |
| 367 | } |
| 368 | |
| 369 | bool PEImage::EnumDelayImportChunks(EnumDelayImportChunksFunction callback, |
| 370 | PVOID cookie) const { |
| 371 | PVOID directory = GetImageDirectoryEntryAddr( |
| 372 | IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT); |
| 373 | DWORD size = GetImageDirectoryEntrySize(IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT); |
| 374 | PImgDelayDescr delay_descriptor = reinterpret_cast<PImgDelayDescr>(directory); |
| 375 | |
| 376 | if (directory == NULL || size == 0) |
| 377 | return true; |
| 378 | |
| 379 | for (; delay_descriptor->rvaHmod; delay_descriptor++) { |
| 380 | PIMAGE_THUNK_DATA name_table; |
| 381 | PIMAGE_THUNK_DATA iat; |
| 382 | PIMAGE_THUNK_DATA bound_iat; // address of the optional bound IAT |
| 383 | PIMAGE_THUNK_DATA unload_iat; // address of optional copy of original IAT |
| 384 | LPCSTR module_name; |
| 385 | |
| 386 | // check if VC7-style imports, using RVAs instead of |
| 387 | // VC6-style addresses. |
| 388 | bool rvas = (delay_descriptor->grAttrs & dlattrRva) != 0; |
| 389 | |
| 390 | if (rvas) { |
| 391 | module_name = reinterpret_cast<LPCSTR>( |
| 392 | RVAToAddr(delay_descriptor->rvaDLLName)); |
| 393 | name_table = reinterpret_cast<PIMAGE_THUNK_DATA>( |
| 394 | RVAToAddr(delay_descriptor->rvaINT)); |
| 395 | iat = reinterpret_cast<PIMAGE_THUNK_DATA>( |
| 396 | RVAToAddr(delay_descriptor->rvaIAT)); |
| 397 | bound_iat = reinterpret_cast<PIMAGE_THUNK_DATA>( |
| 398 | RVAToAddr(delay_descriptor->rvaBoundIAT)); |
| 399 | unload_iat = reinterpret_cast<PIMAGE_THUNK_DATA>( |
| 400 | RVAToAddr(delay_descriptor->rvaUnloadIAT)); |
| 401 | } else { |
| 402 | #pragma warning(push) |
| 403 | #pragma warning(disable: 4312) |
| 404 | // These casts generate warnings because they are 32 bit specific. |
| 405 | module_name = reinterpret_cast<LPCSTR>(delay_descriptor->rvaDLLName); |
| 406 | name_table = reinterpret_cast<PIMAGE_THUNK_DATA>( |
| 407 | delay_descriptor->rvaINT); |
| 408 | iat = reinterpret_cast<PIMAGE_THUNK_DATA>(delay_descriptor->rvaIAT); |
| 409 | bound_iat = reinterpret_cast<PIMAGE_THUNK_DATA>( |
| 410 | delay_descriptor->rvaBoundIAT); |
| 411 | unload_iat = reinterpret_cast<PIMAGE_THUNK_DATA>( |
| 412 | delay_descriptor->rvaUnloadIAT); |
| 413 | #pragma warning(pop) |
| 414 | } |
| 415 | |
| 416 | if (!callback(*this, delay_descriptor, module_name, name_table, iat, |
| 417 | bound_iat, unload_iat, cookie)) |
| 418 | return false; |
| 419 | } |
| 420 | |
| 421 | return true; |
| 422 | } |
| 423 | |
| 424 | bool PEImage::EnumOneDelayImportChunk(EnumImportsFunction callback, |
| 425 | PImgDelayDescr delay_descriptor, |
| 426 | LPCSTR module_name, |
| 427 | PIMAGE_THUNK_DATA name_table, |
| 428 | PIMAGE_THUNK_DATA iat, |
| 429 | PIMAGE_THUNK_DATA bound_iat, |
| 430 | PIMAGE_THUNK_DATA unload_iat, |
| 431 | PVOID cookie) const { |
| 432 | UNREFERENCED_PARAMETER(bound_iat); |
| 433 | UNREFERENCED_PARAMETER(unload_iat); |
| 434 | |
| 435 | for (; name_table->u1.Ordinal; name_table++, iat++) { |
| 436 | LPCSTR name = NULL; |
| 437 | WORD ordinal = 0; |
| 438 | WORD hint = 0; |
| 439 | |
| 440 | if (IMAGE_SNAP_BY_ORDINAL(name_table->u1.Ordinal)) { |
| 441 | ordinal = static_cast<WORD>(IMAGE_ORDINAL32(name_table->u1.Ordinal)); |
| 442 | } else { |
| 443 | PIMAGE_IMPORT_BY_NAME import; |
| 444 | bool rvas = (delay_descriptor->grAttrs & dlattrRva) != 0; |
| 445 | |
| 446 | if (rvas) { |
| 447 | import = reinterpret_cast<PIMAGE_IMPORT_BY_NAME>( |
| 448 | RVAToAddr(name_table->u1.ForwarderString)); |
| 449 | } else { |
| 450 | #pragma warning(push) |
| 451 | #pragma warning(disable: 4312) |
| 452 | // This cast generates a warning because it is 32 bit specific. |
| 453 | import = reinterpret_cast<PIMAGE_IMPORT_BY_NAME>( |
| 454 | name_table->u1.ForwarderString); |
| 455 | #pragma warning(pop) |
| 456 | } |
| 457 | |
| 458 | hint = import->Hint; |
| 459 | name = reinterpret_cast<LPCSTR>(&import->Name); |
| 460 | } |
| 461 | |
| 462 | if (!callback(*this, module_name, ordinal, name, hint, iat, cookie)) |
| 463 | return false; |
| 464 | } |
| 465 | |
| 466 | return true; |
| 467 | } |
| 468 | |
| 469 | bool PEImage::EnumAllDelayImports(EnumImportsFunction callback, |
| 470 | PVOID cookie) const { |
| 471 | EnumAllImportsStorage temp = { callback, cookie }; |
| 472 | return EnumDelayImportChunks(ProcessDelayImportChunk, &temp); |
| 473 | } |
| 474 | |
| 475 | bool PEImage::VerifyMagic() const { |
| 476 | PIMAGE_DOS_HEADER dos_header = GetDosHeader(); |
| 477 | |
| 478 | if (dos_header->e_magic != IMAGE_DOS_SIGNATURE) |
| 479 | return false; |
| 480 | |
| 481 | PIMAGE_NT_HEADERS nt_headers = GetNTHeaders(); |
| 482 | |
| 483 | if (nt_headers->Signature != IMAGE_NT_SIGNATURE) |
| 484 | return false; |
| 485 | |
| 486 | if (nt_headers->FileHeader.SizeOfOptionalHeader != |
| 487 | sizeof(IMAGE_OPTIONAL_HEADER)) |
| 488 | return false; |
| 489 | |
| 490 | if (nt_headers->OptionalHeader.Magic != IMAGE_NT_OPTIONAL_HDR_MAGIC) |
| 491 | return false; |
| 492 | |
| 493 | return true; |
| 494 | } |
| 495 | |
| 496 | bool PEImage::ImageRVAToOnDiskOffset(DWORD rva, DWORD *on_disk_offset) const { |
| 497 | LPVOID address = RVAToAddr(rva); |
| 498 | return ImageAddrToOnDiskOffset(address, on_disk_offset); |
| 499 | } |
| 500 | |
| 501 | bool PEImage::ImageAddrToOnDiskOffset(LPVOID address, |
| 502 | DWORD *on_disk_offset) const { |
| 503 | if (NULL == address) |
| 504 | return false; |
| 505 | |
| 506 | // Get the section that this address belongs to. |
| 507 | PIMAGE_SECTION_HEADER section_header = GetImageSectionFromAddr(address); |
| 508 | if (NULL == section_header) |
| 509 | return false; |
| 510 | |
| 511 | #pragma warning(push) |
| 512 | #pragma warning(disable: 4311) |
| 513 | // These casts generate warnings because they are 32 bit specific. |
| 514 | // Don't follow the virtual RVAToAddr, use the one on the base. |
| 515 | DWORD offset_within_section = reinterpret_cast<DWORD>(address) - |
| 516 | reinterpret_cast<DWORD>(PEImage::RVAToAddr( |
| 517 | section_header->VirtualAddress)); |
| 518 | #pragma warning(pop) |
| 519 | |
| 520 | *on_disk_offset = section_header->PointerToRawData + offset_within_section; |
| 521 | return true; |
| 522 | } |
| 523 | |
maruel@google.com | a855b0f | 2008-07-30 22:02:03 +0900 | [diff] [blame] | 524 | PVOID PEImage::RVAToAddr(DWORD_PTR rva) const { |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 525 | if (rva == 0) |
| 526 | return NULL; |
| 527 | |
| 528 | return reinterpret_cast<char*>(module_) + rva; |
| 529 | } |
| 530 | |
maruel@google.com | a855b0f | 2008-07-30 22:02:03 +0900 | [diff] [blame] | 531 | PVOID PEImageAsData::RVAToAddr(DWORD_PTR rva) const { |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 532 | if (rva == 0) |
| 533 | return NULL; |
| 534 | |
| 535 | PVOID in_memory = PEImage::RVAToAddr(rva); |
| 536 | DWORD dummy; |
| 537 | |
| 538 | if (!ImageAddrToOnDiskOffset(in_memory, &dummy)) |
| 539 | return NULL; |
| 540 | |
| 541 | return in_memory; |
| 542 | } |
license.bot | f003cfe | 2008-08-24 09:55:55 +0900 | [diff] [blame^] | 543 | |