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resources.go
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/
resources.go
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package pe
import (
"encoding/binary"
"github.com/pkg/errors"
)
type (
ImageResourceDirectory struct {
Characteristics uint32
TimeDateStamp uint32
MajorVersion uint16
MinorVersion uint16
NumberOfNamedEntries uint16
NumberOfIDEntries uint16
}
ImageResourceDirectoryEntry struct {
Name uint32
OffsetToData uint32
}
ImageResourceDataEntry struct {
OffsetToData uint32
Size uint32
CodePage uint32
Reserved uint32
}
ResourceDirectory struct {
Struct ImageResourceDirectory
Entries []ResourceDirectoryEntry
}
ResourceDirectoryEntry struct {
Struct ImageResourceDirectoryEntry
Name string
ID uint32
Directory ResourceDirectory
Data ResourceDataEntry
}
ResourceDataEntry struct {
Struct ImageResourceDataEntry
Lang uint32
SubLang uint32
}
)
func (f *File) parseResourceDataEntry(rva uint32) (dataEntry ImageResourceDataEntry, err error) {
dataEntrySize := uint32(binary.Size(dataEntry))
offset := f.getOffsetFromRva(rva)
if err := f.structUnpack(&dataEntry, offset, dataEntrySize); err != nil {
return dataEntry, errors.Wrap(err, "Error parsing a resource directory data entry, the RVA is invalid")
}
return dataEntry, nil
}
func (f *File) parseResourceDirectoryEntry(rva uint32) *ImageResourceDirectoryEntry {
var resource ImageResourceDirectoryEntry
resourceSize := uint32(binary.Size(resource))
offset := f.getOffsetFromRva(rva)
err := f.structUnpack(&resource, offset, resourceSize)
if err != nil {
return nil
}
if resource == (ImageResourceDirectoryEntry{}) {
return nil
}
return &resource
}
func (f *File) doParseResourceDirectory(rva, size, baseRVA, level uint32, dirs []uint32) (ResourceDirectory, error) {
var resourceDir ImageResourceDirectory
resourceDirSize := uint32(binary.Size(resourceDir))
offset := f.getOffsetFromRva(rva)
err := f.structUnpack(&resourceDir, offset, resourceDirSize)
if err != nil {
return ResourceDirectory{}, err
}
if baseRVA == 0 {
baseRVA = rva
}
if len(dirs) == 0 {
dirs = append(dirs, rva)
}
rva += resourceDirSize
numberOfEntries := int(resourceDir.NumberOfNamedEntries + resourceDir.NumberOfIDEntries)
var dirEntries []ResourceDirectoryEntry
if numberOfEntries > maxAllowedEntries {
return ResourceDirectory{}, nil
}
for i := 0; i < numberOfEntries; i++ {
res := f.parseResourceDirectoryEntry(rva)
if res == nil {
break
}
nameIsString := (res.Name & 0x80000000) >> 31
entryName := ""
entryID := uint32(0)
if nameIsString == 0 {
entryID = res.Name
} else {
nameOffset := res.Name & 0x7FFFFFFF
uStringOffset := f.getOffsetFromRva(baseRVA + nameOffset)
maxLen, err := f.ReadUint16(uStringOffset)
if err != nil {
break
}
entryName = f.readUnicodeStringAtRVA(baseRVA+nameOffset+2,
uint32(maxLen))
}
dataIsDirectory := (res.OffsetToData & 0x80000000) >> 31
OffsetToDirectory := res.OffsetToData & 0x7FFFFFFF
if dataIsDirectory > 0 {
if intInSlice(baseRVA+OffsetToDirectory, dirs) {
break
}
level++
dirs = append(dirs, baseRVA+OffsetToDirectory)
directoryEntry, err := f.doParseResourceDirectory(
baseRVA+OffsetToDirectory,
size-(rva-baseRVA),
baseRVA,
level,
dirs)
if err != nil {
continue
}
dirEntries = append(dirEntries, ResourceDirectoryEntry{
Struct: *res,
Name: entryName,
ID: entryID,
Directory: directoryEntry})
} else {
dataEntryStruct, err := f.parseResourceDataEntry(baseRVA + OffsetToDirectory)
if err != nil {
continue
}
entryData := ResourceDataEntry{
Struct: dataEntryStruct,
Lang: res.Name & 0x3ff,
SubLang: res.Name >> 10,
}
dirEntries = append(dirEntries, ResourceDirectoryEntry{
Struct: *res,
Name: entryName,
ID: entryID,
Data: entryData})
}
rva += uint32(binary.Size(res))
}
return ResourceDirectory{Struct: resourceDir, Entries: dirEntries}, nil
}
func (f *File) readResourceDirectory() (ResourceDirectory, error) {
if f.OptionalHeader == nil {
return ResourceDirectory{}, nil
}
var rva, size uint32
switch f.Is64 {
case true:
oh := f.OptionalHeader.(*OptionalHeader64)
rva = oh.DataDirectory[ImageDirectoryEntryResource].VirtualAddress
size = oh.DataDirectory[ImageDirectoryEntryResource].Size
case false:
oh := f.OptionalHeader.(*OptionalHeader32)
rva = oh.DataDirectory[ImageDirectoryEntryResource].VirtualAddress
size = oh.DataDirectory[ImageDirectoryEntryResource].Size
}
var dirs []uint32
return f.doParseResourceDirectory(rva, size, 0, 0, dirs)
}