THE STRUCTURE OF A MANAGED EXECUTABLE FILE in VB.NET

Create PDF 417 in VB.NET THE STRUCTURE OF A MANAGED EXECUTABLE FILE

CHAPTER 4 THE STRUCTURE OF A MANAGED EXECUTABLE FILE
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A Resource directory table structure is defined in Winnt.h as follows: typedef struct _IMAGE_RESOURCE_DIRECTORY { DWORD Characteristics; DWORD TimeDateStamp; WORD MajorVersion; WORD MinorVersion; WORD NumberOfNamedEntries; WORD NumberOfIdEntries; } IMAGE_RESOURCE_DIRECTORY, *PIMAGE_RESOURCE_DIRECTORY; The roles of these fields should be evident, in light of the preceding discussion about structuring unmanaged resources and the Resource directory tables. One exception might be the Characteristics field, which is reserved and should be set to 0. Name entries, which use strings to identify the type, name, or language, immediately follow the Resource directory table. After them, ID entries are stored. A Resource directory entry (either a name entry or an ID entry) is an 8-byte structure consisting of two 4-byte unsigned integers, defined in Winnt.h as follows: typedef struct _IMAGE_RESOURCE_DIRECTORY_ENTRY { union { struct { DWORD NameOffset:31; DWORD NameIsString:1; }; DWORD Name; WORD Id; }; union { DWORD OffsetToData; struct { DWORD OffsetToDirectory:31; DWORD DataIsDirectory:1; }; }; } IMAGE_RESOURCE_DIRECTORY_ENTRY, *PIMAGE_RESOURCE_DIRECTORY_ENTRY; If the top bit of the first 4-byte component is set, the entry is a name entry, and the remaining 31 bits represent the name string offset; otherwise, the entry is an ID entry, and 16 less significant bits of it hold the ID value. If the top bit of the second 4-byte component is set, the item, whose offset is represented by the remaining 31 bits, is a next-level Resource directory table; otherwise, it is a Resource data description.
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CHAPTER 4 THE STRUCTURE OF A MANAGED EXECUTABLE FILE
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A Resource data description is a 16-byte structure defined in Winnt.h as follows: typedef struct _IMAGE_RESOURCE_DATA_ENTRY { DWORD OffsetToData; DWORD Size; DWORD CodePage; DWORD Reserved; } IMAGE_RESOURCE_DATA_ENTRY, *PIMAGE_RESOURCE_DATA_ENTRY; The fields OffsetToData and Size characterize the respective chunks of resource data that constitute an individual resource. OffsetToData is specified relatively to the beginning of the resource directory. CodePage is the ID of the code page used to decode the code point values in the resource data. Usually this is the Unicode code page. Finally no surprise here the Reserved field is reserved and must be set to 0. The IL assembler creates the .rsrc section and embeds the unmanaged resources from the respective .res file if this file is specified in command-line options. The assembler can embed only one unmanaged resource file per module. When the IL disassembler analyzes a managed PE file and finds the .rsrc section, it reads the data and its structure from the section and emits the .res file containing all the unmanaged resources embedded in the PE file.
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Managed Resources
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The Resources field of the CLR header contains the RVA and size of the managed resources embedded in the PE file. It has nothing to do with the Resource directory of the PE header, which specifies the RVA and size of unmanaged platform-specific resources. In PE files created by the IL assembler, unmanaged resources reside in the .rsrc section of the image file, whereas managed resources are located in the .text section, along with the metadata, the IL code, and so on. Managed resources are stored in the .text section contiguously. Metadata carries ManifestResource records, one for each managed resource, containing the name of the managed resource and the offset of the beginning of the resource from the starting RVA specified in the Resources field of the CLR header. At this offset, a 4-byte unsigned integer indicates the length in bytes of the resource. The resource itself immediately follows. When the IL disassembler processes a managed image file and finds embedded managed resources, it writes each resource to a separate file, named according to the resource name. When the IL assembler creates a PE file, it reads all managed resources defined in the source code as embedded from the file according to the resource names and writes them to the .text section, each preceded by its specified length. As an exercise, I offer you to open any managed executable (say, one of the simple samples) in the IL disassembler and select the View/Headers menu entry. You will see all headers and their fields live.
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