54a3dff1c2
- Implement TNEF extraction and recursive parsing in new `tnef_reader.go` and associated tests. - Create tests for TNEF extraction scenarios in `tnef_diag_test.go`, `tnef_diag7_test.go`, and `tnef_diag8_test.go`.
79 lines
1.7 KiB
Go
79 lines
1.7 KiB
Go
package internal
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"io"
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"os"
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"strings"
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"testing"
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)
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func TestTNEFRawScan(t *testing.T) {
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testFile := `H:\Dev\Gits\EMLy\EML_TNEF.eml`
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if _, err := os.Stat(testFile); os.IsNotExist(err) {
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t.Skip("test EML file not present")
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}
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f, _ := os.Open(testFile)
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defer f.Close()
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outerEmail, _ := Parse(f)
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var innerData []byte
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for _, att := range outerEmail.Attachments {
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if strings.Contains(strings.ToLower(att.Filename), "postacert.eml") {
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innerData, _ = io.ReadAll(att.Data)
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break
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}
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}
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innerEmail, _ := Parse(bytes.NewReader(innerData))
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for _, att := range innerEmail.Attachments {
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data, _ := io.ReadAll(att.Data)
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if strings.ToLower(att.Filename) != "winmail.dat" {
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continue
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}
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fmt.Printf("TNEF raw size: %d bytes\n", len(data))
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// Verify signature
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if len(data) < 6 {
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t.Fatal("too short")
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}
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sig := binary.LittleEndian.Uint32(data[0:4])
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key := binary.LittleEndian.Uint16(data[4:6])
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fmt.Printf("Signature: 0x%08X Key: 0x%04X\n", sig, key)
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offset := 6
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attrNum := 0
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for offset < len(data) {
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if offset+9 > len(data) {
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fmt.Printf(" Truncated at offset %d\n", offset)
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break
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}
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level := data[offset]
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attrID := binary.LittleEndian.Uint32(data[offset+1 : offset+5])
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attrLen := binary.LittleEndian.Uint32(data[offset+5 : offset+9])
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levelStr := "MSG"
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if level == 0x02 {
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levelStr = "ATT"
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}
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fmt.Printf(" [%03d] offset=%-8d level=%s id=0x%08X len=%d\n",
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attrNum, offset, levelStr, attrID, attrLen)
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// Move past: level(1) + id(4) + len(4) + data(attrLen) + checksum(2)
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offset += 1 + 4 + 4 + int(attrLen) + 2
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attrNum++
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if attrNum > 200 {
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fmt.Println(" ... stopping at 200 attributes")
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break
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}
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}
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}
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}
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