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source: branches/2870_AutoDiff-nuget/HeuristicLab.ExtLibs/HeuristicLab.Cecil/0.9.5/Mono.Cecil-0.9.5/Mono.Cecil/Mono.Cecil.PE/ImageWriter.cs

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Last change on this file was 11700, checked in by jkarder, 10 years ago
#2077: created branch and added first version
File size: 22.6 KB

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1	//
2	// ImageWriter.cs
3	//
4	// Author:
5	// Jb Evain (jbevain@gmail.com)
6	//
7	// Copyright (c) 2008 - 2011 Jb Evain
8	//
9	// Permission is hereby granted, free of charge, to any person obtaining
10	// a copy of this software and associated documentation files (the
11	// "Software"), to deal in the Software without restriction, including
12	// without limitation the rights to use, copy, modify, merge, publish,
13	// distribute, sublicense, and/or sell copies of the Software, and to
14	// permit persons to whom the Software is furnished to do so, subject to
15	// the following conditions:
16	//
17	// The above copyright notice and this permission notice shall be
18	// included in all copies or substantial portions of the Software.
19	//
20	// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21	// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22	// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23	// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24	// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25	// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26	// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27	//
28
29	using System;
30	using System.IO;
31
32	#if !READ_ONLY
33
34	using Mono.Cecil.Cil;
35	using Mono.Cecil.Metadata;
36
37	using RVA = System.UInt32;
38
39	namespace Mono.Cecil.PE {
40
41	sealed class ImageWriter : BinaryStreamWriter {
42
43	readonly ModuleDefinition module;
44	readonly MetadataBuilder metadata;
45	readonly TextMap text_map;
46
47	ImageDebugDirectory debug_directory;
48	byte [] debug_data;
49
50	ByteBuffer win32_resources;
51
52	const uint pe_header_size = 0x178u;
53	const uint section_header_size = 0x28u;
54	const uint file_alignment = 0x200;
55	const uint section_alignment = 0x2000;
56	const ulong image_base = 0x00400000;
57
58	internal const RVA text_rva = 0x2000;
59
60	readonly bool pe64;
61	readonly uint time_stamp;
62
63	internal Section text;
64	internal Section rsrc;
65	internal Section reloc;
66
67	ushort sections;
68
69	ImageWriter (ModuleDefinition module, MetadataBuilder metadata, Stream stream)
70	: base (stream)
71	{
72	this.module = module;
73	this.metadata = metadata;
74	this.GetDebugHeader ();
75	this.GetWin32Resources ();
76	this.text_map = BuildTextMap ();
77	this.sections = 2; // text + reloc
78	this.pe64 = module.Architecture != TargetArchitecture.I386;
79	this.time_stamp = (uint) DateTime.UtcNow.Subtract (new DateTime (1970, 1, 1)).TotalSeconds;
80	}
81
82	void GetDebugHeader ()
83	{
84	var symbol_writer = metadata.symbol_writer;
85	if (symbol_writer == null)
86	return;
87
88	if (!symbol_writer.GetDebugHeader (out debug_directory, out debug_data))
89	debug_data = Empty<byte>.Array;
90	}
91
92	void GetWin32Resources ()
93	{
94	var rsrc = GetImageResourceSection ();
95	if (rsrc == null)
96	return;
97
98	var raw_resources = new byte [rsrc.Data.Length];
99	Buffer.BlockCopy (rsrc.Data, 0, raw_resources, 0, rsrc.Data.Length);
100	win32_resources = new ByteBuffer (raw_resources);
101	}
102
103	Section GetImageResourceSection ()
104	{
105	if (!module.HasImage)
106	return null;
107
108	const string rsrc_section = ".rsrc";
109
110	return module.Image.GetSection (rsrc_section);
111	}
112
113	public static ImageWriter CreateWriter (ModuleDefinition module, MetadataBuilder metadata, Stream stream)
114	{
115	var writer = new ImageWriter (module, metadata, stream);
116	writer.BuildSections ();
117	return writer;
118	}
119
120	void BuildSections ()
121	{
122	var has_win32_resources = win32_resources != null;
123	if (has_win32_resources)
124	sections++;
125
126	text = CreateSection (".text", text_map.GetLength (), null);
127	var previous = text;
128
129	if (has_win32_resources) {
130	rsrc = CreateSection (".rsrc", (uint) win32_resources.length, previous);
131
132	PatchWin32Resources (win32_resources);
133	previous = rsrc;
134	}
135
136	reloc = CreateSection (".reloc", 12u, previous);
137	}
138
139	Section CreateSection (string name, uint size, Section previous)
140	{
141	return new Section {
142	Name = name,
143	VirtualAddress = previous != null
144	? previous.VirtualAddress + Align (previous.VirtualSize, section_alignment)
145	: text_rva,
146	VirtualSize = size,
147	PointerToRawData = previous != null
148	? previous.PointerToRawData + previous.SizeOfRawData
149	: Align (GetHeaderSize (), file_alignment),
150	SizeOfRawData = Align (size, file_alignment)
151	};
152	}
153
154	static uint Align (uint value, uint align)
155	{
156	align--;
157	return (value + align) & ~align;
158	}
159
160	void WriteDOSHeader ()
161	{
162	Write (new byte [] {
163	// dos header start
164	0x4d, 0x5a, 0x90, 0x00, 0x03, 0x00, 0x00,
165	0x00, 0x04, 0x00, 0x00, 0x00, 0xff, 0xff,
166	0x00, 0x00, 0xb8, 0x00, 0x00, 0x00, 0x00,
167	0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00,
168	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
169	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
170	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
171	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
172	0x00, 0x00, 0x00, 0x00,
173	// lfanew
174	0x80, 0x00, 0x00, 0x00,
175	// dos header end
176	0x0e, 0x1f, 0xba, 0x0e, 0x00, 0xb4, 0x09,
177	0xcd, 0x21, 0xb8, 0x01, 0x4c, 0xcd, 0x21,
178	0x54, 0x68, 0x69, 0x73, 0x20, 0x70, 0x72,
179	0x6f, 0x67, 0x72, 0x61, 0x6d, 0x20, 0x63,
180	0x61, 0x6e, 0x6e, 0x6f, 0x74, 0x20, 0x62,
181	0x65, 0x20, 0x72, 0x75, 0x6e, 0x20, 0x69,
182	0x6e, 0x20, 0x44, 0x4f, 0x53, 0x20, 0x6d,
183	0x6f, 0x64, 0x65, 0x2e, 0x0d, 0x0d, 0x0a,
184	0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
185	0x00
186	});
187	}
188
189	void WritePEFileHeader ()
190	{
191	WriteUInt32 (0x00004550); // Magic
192	WriteUInt16 (GetMachine ()); // Machine
193	WriteUInt16 (sections); // NumberOfSections
194	WriteUInt32 (time_stamp);
195	WriteUInt32 (0); // PointerToSymbolTable
196	WriteUInt32 (0); // NumberOfSymbols
197	WriteUInt16 ((ushort) (!pe64 ? 0xe0 : 0xf0)); // SizeOfOptionalHeader
198
199	// ExecutableImage \| (pe64 ? 32BitsMachine : LargeAddressAware)
200	var characteristics = (ushort) (0x0002 \| (!pe64 ? 0x0100 : 0x0020));
201	if (module.Kind == ModuleKind.Dll \|\| module.Kind == ModuleKind.NetModule)
202	characteristics \|= 0x2000;
203	WriteUInt16 (characteristics); // Characteristics
204	}
205
206	ushort GetMachine ()
207	{
208	switch (module.Architecture) {
209	case TargetArchitecture.I386:
210	return 0x014c;
211	case TargetArchitecture.AMD64:
212	return 0x8664;
213	case TargetArchitecture.IA64:
214	return 0x0200;
215	}
216
217	throw new NotSupportedException ();
218	}
219
220	void WriteOptionalHeaders ()
221	{
222	WriteUInt16 ((ushort) (!pe64 ? 0x10b : 0x20b)); // Magic
223	WriteByte (8); // LMajor
224	WriteByte (0); // LMinor
225	WriteUInt32 (text.SizeOfRawData); // CodeSize
226	WriteUInt32 (reloc.SizeOfRawData
227	+ (rsrc != null ? rsrc.SizeOfRawData : 0)); // InitializedDataSize
228	WriteUInt32 (0); // UninitializedDataSize
229
230	var entry_point_rva = text_map.GetRVA (TextSegment.StartupStub);
231	if (module.Architecture == TargetArchitecture.IA64)
232	entry_point_rva += 0x20;
233	WriteUInt32 (entry_point_rva); // EntryPointRVA
234	WriteUInt32 (text_rva); // BaseOfCode
235
236	if (!pe64) {
237	WriteUInt32 (0); // BaseOfData
238	WriteUInt32 ((uint) image_base); // ImageBase
239	} else {
240	WriteUInt64 (image_base); // ImageBase
241	}
242
243	WriteUInt32 (section_alignment); // SectionAlignment
244	WriteUInt32 (file_alignment); // FileAlignment
245
246	WriteUInt16 (4); // OSMajor
247	WriteUInt16 (0); // OSMinor
248	WriteUInt16 (0); // UserMajor
249	WriteUInt16 (0); // UserMinor
250	WriteUInt16 (4); // SubSysMajor
251	WriteUInt16 (0); // SubSysMinor
252	WriteUInt32 (0); // Reserved
253
254	WriteUInt32 (reloc.VirtualAddress + Align (reloc.VirtualSize, section_alignment)); // ImageSize
255	WriteUInt32 (text.PointerToRawData); // HeaderSize
256
257	WriteUInt32 (0); // Checksum
258	WriteUInt16 (GetSubSystem ()); // SubSystem
259	WriteUInt16 (0x8540); // DLLFlags
260
261	const ulong stack_reserve = 0x100000;
262	const ulong stack_commit = 0x1000;
263	const ulong heap_reserve = 0x100000;
264	const ulong heap_commit = 0x1000;
265
266	if (!pe64) {
267	WriteUInt32 ((uint) stack_reserve);
268	WriteUInt32 ((uint) stack_commit);
269	WriteUInt32 ((uint) heap_reserve);
270	WriteUInt32 ((uint) heap_commit);
271	} else {
272	WriteUInt64 (stack_reserve);
273	WriteUInt64 (stack_commit);
274	WriteUInt64 (heap_reserve);
275	WriteUInt64 (heap_commit);
276	}
277
278	WriteUInt32 (0); // LoaderFlags
279	WriteUInt32 (16); // NumberOfDataDir
280
281	WriteZeroDataDirectory (); // ExportTable
282	WriteDataDirectory (text_map.GetDataDirectory (TextSegment.ImportDirectory)); // ImportTable
283	if (rsrc != null) { // ResourceTable
284	WriteUInt32 (rsrc.VirtualAddress);
285	WriteUInt32 (rsrc.VirtualSize);
286	} else
287	WriteZeroDataDirectory ();
288
289	WriteZeroDataDirectory (); // ExceptionTable
290	WriteZeroDataDirectory (); // CertificateTable
291	WriteUInt32 (reloc.VirtualAddress); // BaseRelocationTable
292	WriteUInt32 (reloc.VirtualSize);
293
294	if (text_map.GetLength (TextSegment.DebugDirectory) > 0) {
295	WriteUInt32 (text_map.GetRVA (TextSegment.DebugDirectory));
296	WriteUInt32 (28u);
297	} else
298	WriteZeroDataDirectory ();
299
300	WriteZeroDataDirectory (); // Copyright
301	WriteZeroDataDirectory (); // GlobalPtr
302	WriteZeroDataDirectory (); // TLSTable
303	WriteZeroDataDirectory (); // LoadConfigTable
304	WriteZeroDataDirectory (); // BoundImport
305	WriteDataDirectory (text_map.GetDataDirectory (TextSegment.ImportAddressTable)); // IAT
306	WriteZeroDataDirectory (); // DelayImportDesc
307	WriteDataDirectory (text_map.GetDataDirectory (TextSegment.CLIHeader)); // CLIHeader
308	WriteZeroDataDirectory (); // Reserved
309	}
310
311	void WriteZeroDataDirectory ()
312	{
313	WriteUInt32 (0);
314	WriteUInt32 (0);
315	}
316
317	ushort GetSubSystem ()
318	{
319	switch (module.Kind) {
320	case ModuleKind.Console:
321	case ModuleKind.Dll:
322	case ModuleKind.NetModule:
323	return 0x3;
324	case ModuleKind.Windows:
325	return 0x2;
326	default:
327	throw new ArgumentOutOfRangeException ();
328	}
329	}
330
331	void WriteSectionHeaders ()
332	{
333	WriteSection (text, 0x60000020);
334
335	if (rsrc != null)
336	WriteSection (rsrc, 0x40000040);
337
338	WriteSection (reloc, 0x42000040);
339	}
340
341	void WriteSection (Section section, uint characteristics)
342	{
343	var name = new byte [8];
344	var sect_name = section.Name;
345	for (int i = 0; i < sect_name.Length; i++)
346	name [i] = (byte) sect_name [i];
347
348	WriteBytes (name);
349	WriteUInt32 (section.VirtualSize);
350	WriteUInt32 (section.VirtualAddress);
351	WriteUInt32 (section.SizeOfRawData);
352	WriteUInt32 (section.PointerToRawData);
353	WriteUInt32 (0); // PointerToRelocations
354	WriteUInt32 (0); // PointerToLineNumbers
355	WriteUInt16 (0); // NumberOfRelocations
356	WriteUInt16 (0); // NumberOfLineNumbers
357	WriteUInt32 (characteristics);
358	}
359
360	void MoveTo (uint pointer)
361	{
362	BaseStream.Seek (pointer, SeekOrigin.Begin);
363	}
364
365	void MoveToRVA (Section section, RVA rva)
366	{
367	BaseStream.Seek (section.PointerToRawData + rva - section.VirtualAddress, SeekOrigin.Begin);
368	}
369
370	void MoveToRVA (TextSegment segment)
371	{
372	MoveToRVA (text, text_map.GetRVA (segment));
373	}
374
375	void WriteRVA (RVA rva)
376	{
377	if (!pe64)
378	WriteUInt32 (rva);
379	else
380	WriteUInt64 (rva);
381	}
382
383	void WriteText ()
384	{
385	MoveTo (text.PointerToRawData);
386
387	// ImportAddressTable
388
389	WriteRVA (text_map.GetRVA (TextSegment.ImportHintNameTable));
390	WriteRVA (0);
391
392	// CLIHeader
393
394	WriteUInt32 (0x48);
395	WriteUInt16 (2);
396	WriteUInt16 ((ushort) ((module.Runtime <= TargetRuntime.Net_1_1) ? 0 : 5));
397
398	WriteUInt32 (text_map.GetRVA (TextSegment.MetadataHeader));
399	WriteUInt32 (GetMetadataLength ());
400	WriteUInt32 ((uint) module.Attributes);
401	WriteUInt32 (metadata.entry_point.ToUInt32 ());
402	WriteDataDirectory (text_map.GetDataDirectory (TextSegment.Resources));
403	WriteDataDirectory (text_map.GetDataDirectory (TextSegment.StrongNameSignature));
404	WriteZeroDataDirectory (); // CodeManagerTable
405	WriteZeroDataDirectory (); // VTableFixups
406	WriteZeroDataDirectory (); // ExportAddressTableJumps
407	WriteZeroDataDirectory (); // ManagedNativeHeader
408
409	// Code
410
411	MoveToRVA (TextSegment.Code);
412	WriteBuffer (metadata.code);
413
414	// Resources
415
416	MoveToRVA (TextSegment.Resources);
417	WriteBuffer (metadata.resources);
418
419	// Data
420
421	if (metadata.data.length > 0) {
422	MoveToRVA (TextSegment.Data);
423	WriteBuffer (metadata.data);
424	}
425
426	// StrongNameSignature
427	// stays blank
428
429	// MetadataHeader
430
431	MoveToRVA (TextSegment.MetadataHeader);
432	WriteMetadataHeader ();
433
434	WriteMetadata ();
435
436	// DebugDirectory
437	if (text_map.GetLength (TextSegment.DebugDirectory) > 0) {
438	MoveToRVA (TextSegment.DebugDirectory);
439	WriteDebugDirectory ();
440	}
441
442	// ImportDirectory
443	MoveToRVA (TextSegment.ImportDirectory);
444	WriteImportDirectory ();
445
446	// StartupStub
447	MoveToRVA (TextSegment.StartupStub);
448	WriteStartupStub ();
449	}
450
451	uint GetMetadataLength ()
452	{
453	return text_map.GetRVA (TextSegment.DebugDirectory) - text_map.GetRVA (TextSegment.MetadataHeader);
454	}
455
456	void WriteMetadataHeader ()
457	{
458	WriteUInt32 (0x424a5342); // Signature
459	WriteUInt16 (1); // MajorVersion
460	WriteUInt16 (1); // MinorVersion
461	WriteUInt32 (0); // Reserved
462
463	var version = GetZeroTerminatedString (GetVersion ());
464	WriteUInt32 ((uint) version.Length);
465	WriteBytes (version);
466	WriteUInt16 (0); // Flags
467	WriteUInt16 (GetStreamCount ());
468
469	uint offset = text_map.GetRVA (TextSegment.TableHeap) - text_map.GetRVA (TextSegment.MetadataHeader);
470
471	WriteStreamHeader (ref offset, TextSegment.TableHeap, "#~");
472	WriteStreamHeader (ref offset, TextSegment.StringHeap, "#Strings");
473	WriteStreamHeader (ref offset, TextSegment.UserStringHeap, "#US");
474	WriteStreamHeader (ref offset, TextSegment.GuidHeap, "#GUID");
475	WriteStreamHeader (ref offset, TextSegment.BlobHeap, "#Blob");
476	}
477
478	string GetVersion ()
479	{
480	switch (module.Runtime) {
481	case TargetRuntime.Net_1_0:
482	return "v1.0.3705";
483	case TargetRuntime.Net_1_1:
484	return "v1.1.4322";
485	case TargetRuntime.Net_2_0:
486	return "v2.0.50727";
487	case TargetRuntime.Net_4_0:
488	default:
489	return "v4.0.30319";
490	}
491	}
492
493	ushort GetStreamCount ()
494	{
495	return (ushort) (
496	1 // #~
497	+ 1 // #Strings
498	+ (metadata.user_string_heap.IsEmpty ? 0 : 1) // #US
499	+ 1 // GUID
500	+ (metadata.blob_heap.IsEmpty ? 0 : 1)); // #Blob
501	}
502
503	void WriteStreamHeader (ref uint offset, TextSegment heap, string name)
504	{
505	var length = (uint) text_map.GetLength (heap);
506	if (length == 0)
507	return;
508
509	WriteUInt32 (offset);
510	WriteUInt32 (length);
511	WriteBytes (GetZeroTerminatedString (name));
512	offset += length;
513	}
514
515	static byte [] GetZeroTerminatedString (string @string)
516	{
517	return GetString (@string, (@string.Length + 1 + 3) & ~3);
518	}
519
520	static byte [] GetSimpleString (string @string)
521	{
522	return GetString (@string, @string.Length);
523	}
524
525	static byte [] GetString (string @string, int length)
526	{
527	var bytes = new byte [length];
528	for (int i = 0; i < @string.Length; i++)
529	bytes [i] = (byte) @string [i];
530
531	return bytes;
532	}
533
534	void WriteMetadata ()
535	{
536	WriteHeap (TextSegment.TableHeap, metadata.table_heap);
537	WriteHeap (TextSegment.StringHeap, metadata.string_heap);
538	WriteHeap (TextSegment.UserStringHeap, metadata.user_string_heap);
539	WriteGuidHeap ();
540	WriteHeap (TextSegment.BlobHeap, metadata.blob_heap);
541	}
542
543	void WriteHeap (TextSegment heap, HeapBuffer buffer)
544	{
545	if (buffer.IsEmpty)
546	return;
547
548	MoveToRVA (heap);
549	WriteBuffer (buffer);
550	}
551
552	void WriteGuidHeap ()
553	{
554	MoveToRVA (TextSegment.GuidHeap);
555	WriteBytes (module.Mvid.ToByteArray ());
556	}
557
558	void WriteDebugDirectory ()
559	{
560	WriteInt32 (debug_directory.Characteristics);
561	WriteUInt32 (time_stamp);
562	WriteInt16 (debug_directory.MajorVersion);
563	WriteInt16 (debug_directory.MinorVersion);
564	WriteInt32 (debug_directory.Type);
565	WriteInt32 (debug_directory.SizeOfData);
566	WriteInt32 (debug_directory.AddressOfRawData);
567	WriteInt32 ((int) BaseStream.Position + 4);
568
569	WriteBytes (debug_data);
570	}
571
572	void WriteImportDirectory ()
573	{
574	WriteUInt32 (text_map.GetRVA (TextSegment.ImportDirectory) + 40); // ImportLookupTable
575	WriteUInt32 (0); // DateTimeStamp
576	WriteUInt32 (0); // ForwarderChain
577	WriteUInt32 (text_map.GetRVA (TextSegment.ImportHintNameTable) + 14);
578	WriteUInt32 (text_map.GetRVA (TextSegment.ImportAddressTable));
579	Advance (20);
580
581	// ImportLookupTable
582	WriteUInt32 (text_map.GetRVA (TextSegment.ImportHintNameTable));
583
584	// ImportHintNameTable
585	MoveToRVA (TextSegment.ImportHintNameTable);
586
587	WriteUInt16 (0); // Hint
588	WriteBytes (GetRuntimeMain ());
589	WriteByte (0);
590	WriteBytes (GetSimpleString ("mscoree.dll"));
591	WriteUInt16 (0);
592	}
593
594	byte [] GetRuntimeMain ()
595	{
596	return module.Kind == ModuleKind.Dll \|\| module.Kind == ModuleKind.NetModule
597	? GetSimpleString ("_CorDllMain")
598	: GetSimpleString ("_CorExeMain");
599	}
600
601	void WriteStartupStub ()
602	{
603	switch (module.Architecture) {
604	case TargetArchitecture.I386:
605	WriteUInt16 (0x25ff);
606	WriteUInt32 ((uint) image_base + text_map.GetRVA (TextSegment.ImportAddressTable));
607	return;
608	case TargetArchitecture.AMD64:
609	WriteUInt16 (0xa148);
610	WriteUInt32 ((uint) image_base + text_map.GetRVA (TextSegment.ImportAddressTable));
611	WriteUInt16 (0xe0ff);
612	return;
613	case TargetArchitecture.IA64:
614	WriteBytes (new byte [] {
615	0x0b, 0x48, 0x00, 0x02, 0x18, 0x10, 0xa0, 0x40, 0x24, 0x30, 0x28, 0x00, 0x00, 0x00, 0x04, 0x00,
616	0x10, 0x08, 0x00, 0x12, 0x18, 0x10, 0x60, 0x50, 0x04, 0x80, 0x03, 0x00, 0x60, 0x00, 0x80, 0x00
617	});
618	WriteUInt32 ((uint) image_base + text_map.GetRVA (TextSegment.StartupStub));
619	WriteUInt32 ((uint) image_base + text_rva);
620	return;
621	}
622	}
623
624	void WriteRsrc ()
625	{
626	MoveTo (rsrc.PointerToRawData);
627	WriteBuffer (win32_resources);
628	}
629
630	void WriteReloc ()
631	{
632	MoveTo (reloc.PointerToRawData);
633
634	var reloc_rva = text_map.GetRVA (TextSegment.StartupStub);
635	reloc_rva += module.Architecture == TargetArchitecture.IA64 ? 0x20u : 2;
636	var page_rva = reloc_rva & ~0xfffu;
637
638	WriteUInt32 (page_rva); // PageRVA
639	WriteUInt32 (0x000c); // Block Size
640
641	switch (module.Architecture) {
642	case TargetArchitecture.I386:
643	WriteUInt32 (0x3000 + reloc_rva - page_rva);
644	break;
645	case TargetArchitecture.AMD64:
646	WriteUInt32 (0xa000 + reloc_rva - page_rva);
647	break;
648	case TargetArchitecture.IA64:
649	WriteUInt16 ((ushort) (0xa000 + reloc_rva - page_rva));
650	WriteUInt16 ((ushort) (0xa000 + reloc_rva - page_rva + 8));
651	break;
652	}
653
654	WriteBytes (new byte [file_alignment - reloc.VirtualSize]);
655	}
656
657	public void WriteImage ()
658	{
659	WriteDOSHeader ();
660	WritePEFileHeader ();
661	WriteOptionalHeaders ();
662	WriteSectionHeaders ();
663	WriteText ();
664	if (rsrc != null)
665	WriteRsrc ();
666	WriteReloc ();
667	}
668
669	TextMap BuildTextMap ()
670	{
671	var map = metadata.text_map;
672
673	map.AddMap (TextSegment.Code, metadata.code.length, !pe64 ? 4 : 16);
674	map.AddMap (TextSegment.Resources, metadata.resources.length, 8);
675	map.AddMap (TextSegment.Data, metadata.data.length, 4);
676	if (metadata.data.length > 0)
677	metadata.table_heap.FixupData (map.GetRVA (TextSegment.Data));
678	map.AddMap (TextSegment.StrongNameSignature, GetStrongNameLength (), 4);
679
680	map.AddMap (TextSegment.MetadataHeader, GetMetadataHeaderLength ());
681	map.AddMap (TextSegment.TableHeap, metadata.table_heap.length, 4);
682	map.AddMap (TextSegment.StringHeap, metadata.string_heap.length, 4);
683	map.AddMap (TextSegment.UserStringHeap, metadata.user_string_heap.IsEmpty ? 0 : metadata.user_string_heap.length, 4);
684	map.AddMap (TextSegment.GuidHeap, 16);
685	map.AddMap (TextSegment.BlobHeap, metadata.blob_heap.IsEmpty ? 0 : metadata.blob_heap.length, 4);
686
687	int debug_dir_len = 0;
688	if (!debug_data.IsNullOrEmpty ()) {
689	const int debug_dir_header_len = 28;
690
691	debug_directory.AddressOfRawData = (int) map.GetNextRVA (TextSegment.BlobHeap) + debug_dir_header_len;
692	debug_dir_len = debug_data.Length + debug_dir_header_len;
693	}
694
695	map.AddMap (TextSegment.DebugDirectory, debug_dir_len, 4);
696
697	RVA import_dir_rva = map.GetNextRVA (TextSegment.DebugDirectory);
698	RVA import_hnt_rva = import_dir_rva + (!pe64 ? 48u : 52u);
699	import_hnt_rva = (import_hnt_rva + 15u) & ~15u;
700	uint import_dir_len = (import_hnt_rva - import_dir_rva) + 27u;
701
702	RVA startup_stub_rva = import_dir_rva + import_dir_len;
703	startup_stub_rva = module.Architecture == TargetArchitecture.IA64
704	? (startup_stub_rva + 15u) & ~15u
705	: 2 + ((startup_stub_rva + 3u) & ~3u);
706
707	map.AddMap (TextSegment.ImportDirectory, new Range (import_dir_rva, import_dir_len));
708	map.AddMap (TextSegment.ImportHintNameTable, new Range (import_hnt_rva, 0));
709	map.AddMap (TextSegment.StartupStub, new Range (startup_stub_rva, GetStartupStubLength ()));
710
711	return map;
712	}
713
714	uint GetStartupStubLength ()
715	{
716	switch (module.Architecture) {
717	case TargetArchitecture.I386:
718	return 6;
719	case TargetArchitecture.AMD64:
720	return 12;
721	case TargetArchitecture.IA64:
722	return 48;
723	default:
724	throw new InvalidOperationException ();
725	}
726	}
727
728	int GetMetadataHeaderLength ()
729	{
730	return
731	// MetadataHeader
732	40
733	// #~ header
734	+ 12
735	// #Strings header
736	+ 20
737	// #US header
738	+ (metadata.user_string_heap.IsEmpty ? 0 : 12)
739	// #GUID header
740	+ 16
741	// #Blob header
742	+ (metadata.blob_heap.IsEmpty ? 0 : 16);
743	}
744
745	int GetStrongNameLength ()
746	{
747	if ((module.Attributes & ModuleAttributes.StrongNameSigned) == 0)
748	return 0;
749
750	if (module.Assembly == null)
751	throw new InvalidOperationException ();
752
753	var public_key = module.Assembly.Name.PublicKey;
754
755	if (public_key != null) {
756	// in fx 2.0 the key may be from 384 to 16384 bits
757	// so we must calculate the signature size based on
758	// the size of the public key (minus the 32 byte header)
759	int size = public_key.Length;
760	if (size > 32)
761	return size - 32;
762	// note: size == 16 for the ECMA "key" which is replaced
763	// by the runtime with a 1024 bits key (128 bytes)
764	}
765
766	return 128; // default strongname signature size
767	}
768
769	public DataDirectory GetStrongNameSignatureDirectory ()
770	{
771	return text_map.GetDataDirectory (TextSegment.StrongNameSignature);
772	}
773
774	public uint GetHeaderSize ()
775	{
776	return pe_header_size + (sections * section_header_size);
777	}
778
779	void PatchWin32Resources (ByteBuffer resources)
780	{
781	PatchResourceDirectoryTable (resources);
782	}
783
784	void PatchResourceDirectoryTable (ByteBuffer resources)
785	{
786	resources.Advance (12);
787
788	var entries = resources.ReadUInt16 () + resources.ReadUInt16 ();
789
790	for (int i = 0; i < entries; i++)
791	PatchResourceDirectoryEntry (resources);
792	}
793
794	void PatchResourceDirectoryEntry (ByteBuffer resources)
795	{
796	resources.Advance (4);
797	var child = resources.ReadUInt32 ();
798
799	var position = resources.position;
800	resources.position = (int) child & 0x7fffffff;
801
802	if ((child & 0x80000000) != 0)
803	PatchResourceDirectoryTable (resources);
804	else
805	PatchResourceDataEntry (resources);
806
807	resources.position = position;
808	}
809
810	void PatchResourceDataEntry (ByteBuffer resources)
811	{
812	var old_rsrc = GetImageResourceSection ();
813	var rva = resources.ReadUInt32 ();
814	resources.position -= 4;
815	resources.WriteUInt32 (rva - old_rsrc.VirtualAddress + rsrc.VirtualAddress);
816	}
817	}
818	}
819
820	#endif

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