2023-01-12 01:04:47 +00:00
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from hachoir.field import (FieldSet,
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2023-10-07 23:04:41 +00:00
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Bit, UInt8, UInt16, UInt32, Bytes,
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PaddingBits, PaddingBytes, NullBits, NullBytes)
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2023-01-12 01:04:47 +00:00
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from hachoir.core.text_handler import textHandler, hexadecimal, filesizeHandler
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class NE_Header(FieldSet):
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static_size = 64 * 8
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def createFields(self):
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yield Bytes(self, "signature", 2, "New executable signature (NE)")
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yield UInt8(self, "link_ver", "Linker version number")
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yield UInt8(self, "link_rev", "Linker revision number")
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yield UInt16(self, "entry_table_ofst", "Offset to the entry table")
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yield UInt16(self, "entry_table_size", "Length (in bytes) of the entry table")
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yield PaddingBytes(self, "reserved[]", 4)
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yield Bit(self, "is_dll", "Is a dynamic-link library (DLL)?")
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yield Bit(self, "is_win_app", "Is a Windows application?")
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yield PaddingBits(self, "reserved[]", 9)
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yield Bit(self, "first_seg_code", "First segment contains code that loads the application?")
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yield NullBits(self, "reserved[]", 1)
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yield Bit(self, "link_error", "Load even if linker detects errors?")
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yield NullBits(self, "reserved[]", 1)
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yield Bit(self, "is_lib", "Is a library module?")
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yield UInt16(self, "auto_data_seg", "Automatic data segment number")
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yield filesizeHandler(UInt16(self, "local_heap_size", "Initial size (in bytes) of the local heap"))
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yield filesizeHandler(UInt16(self, "stack_size", "Initial size (in bytes) of the stack"))
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yield textHandler(UInt32(self, "cs_ip", "Value of CS:IP"), hexadecimal)
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yield textHandler(UInt32(self, "ss_sp", "Value of SS:SP"), hexadecimal)
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yield UInt16(self, "nb_entry_seg_tab", "Number of entries in the segment table")
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yield UInt16(self, "nb_entry_modref_tab", "Number of entries in the module-reference table")
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yield filesizeHandler(UInt16(self, "size_nonres_name_tab", "Number of bytes in the nonresident-name table"))
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yield UInt16(self, "seg_tab_ofs", "Segment table offset")
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yield UInt16(self, "rsrc_ofs", "Resource offset")
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yield UInt16(self, "res_name_tab_ofs", "Resident-name table offset")
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yield UInt16(self, "mod_ref_tab_ofs", "Module-reference table offset")
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yield UInt16(self, "import_tab_ofs", "Imported-name table offset")
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yield UInt32(self, "non_res_name_tab_ofs", "Nonresident-name table offset")
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yield UInt16(self, "nb_mov_ent_pt", "Number of movable entry points")
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yield UInt16(self, "log2_sector_size", "Log2 of the segment sector size")
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yield UInt16(self, "nb_rsrc_seg", "Number of resource segments")
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yield Bit(self, "unknown_os_format", "Operating system format is unknown")
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yield PaddingBits(self, "reserved[]", 1)
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yield Bit(self, "os_windows", "Operating system is Microsoft Windows")
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yield NullBits(self, "reserved[]", 6)
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yield Bit(self, "is_win20_prot", "Is Windows 2.x application running in version 3.x protected mode")
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yield Bit(self, "is_win20_font", "Is Windows 2.x application supporting proportional fonts")
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yield Bit(self, "fast_load", "Contains a fast-load area?")
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yield NullBits(self, "reserved[]", 4)
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yield UInt16(self, "fastload_ofs", "Fast-load area offset (in sector)")
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yield UInt16(self, "fastload_size", "Fast-load area length (in sector)")
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yield NullBytes(self, "reserved[]", 2)
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yield textHandler(UInt16(self, "win_version", "Expected Windows version number"), hexadecimal)
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