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// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package nuget
import (
"archive/zip"
"bytes"
"encoding/binary"
"fmt"
"io"
"path"
"path/filepath"
"strings"
"code.gitea.io/gitea/modules/packages"
"code.gitea.io/gitea/modules/util"
)
var (
ErrMissingPdbFiles = util.NewInvalidArgumentErrorf("package does not contain PDB files")
ErrInvalidFiles = util.NewInvalidArgumentErrorf("package contains invalid files")
ErrInvalidPdbMagicNumber = util.NewInvalidArgumentErrorf("invalid Portable PDB magic number")
ErrMissingPdbStream = util.NewInvalidArgumentErrorf("missing PDB stream")
)
type PortablePdb struct {
Name string
ID string
Content *packages.HashedBuffer
}
type PortablePdbList []*PortablePdb
func (l PortablePdbList) Close() {
for _, pdb := range l {
pdb.Content.Close()
}
}
// ExtractPortablePdb extracts PDB files from a .snupkg file
func ExtractPortablePdb(r io.ReaderAt, size int64) (PortablePdbList, error) {
archive, err := zip.NewReader(r, size)
if err != nil {
return nil, err
}
var pdbs PortablePdbList
err = func() error {
for _, file := range archive.File {
if strings.HasSuffix(file.Name, "/") {
continue
}
ext := strings.ToLower(filepath.Ext(file.Name))
switch ext {
case ".nuspec", ".xml", ".psmdcp", ".rels", ".p7s":
continue
case ".pdb":
f, err := archive.Open(file.Name)
if err != nil {
return err
}
buf, err := packages.CreateHashedBufferFromReader(f)
f.Close()
if err != nil {
return err
}
id, err := ParseDebugHeaderID(buf)
if err != nil {
buf.Close()
return fmt.Errorf("Invalid PDB file: %w", err)
}
if _, err := buf.Seek(0, io.SeekStart); err != nil {
buf.Close()
return err
}
pdbs = append(pdbs, &PortablePdb{
Name: path.Base(file.Name),
ID: id,
Content: buf,
})
default:
return ErrInvalidFiles
}
}
return nil
}()
if err != nil {
pdbs.Close()
return nil, err
}
if len(pdbs) == 0 {
return nil, ErrMissingPdbFiles
}
return pdbs, nil
}
// ParseDebugHeaderID TODO
func ParseDebugHeaderID(r io.ReadSeeker) (string, error) {
var magic uint32
if err := binary.Read(r, binary.LittleEndian, &magic); err != nil {
return "", err
}
if magic != 0x424A5342 {
return "", ErrInvalidPdbMagicNumber
}
if _, err := r.Seek(8, io.SeekCurrent); err != nil {
return "", err
}
var versionStringSize int32
if err := binary.Read(r, binary.LittleEndian, &versionStringSize); err != nil {
return "", err
}
if _, err := r.Seek(int64(versionStringSize), io.SeekCurrent); err != nil {
return "", err
}
if _, err := r.Seek(2, io.SeekCurrent); err != nil {
return "", err
}
var streamCount int16
if err := binary.Read(r, binary.LittleEndian, &streamCount); err != nil {
return "", err
}
read4ByteAlignedString := func(r io.Reader) (string, error) {
b := make([]byte, 4)
var buf bytes.Buffer
for {
if _, err := r.Read(b); err != nil {
return "", err
}
if i := bytes.IndexByte(b, 0); i != -1 {
buf.Write(b[:i])
return buf.String(), nil
}
buf.Write(b)
}
}
for i := 0; i < int(streamCount); i++ {
var offset uint32
if err := binary.Read(r, binary.LittleEndian, &offset); err != nil {
return "", err
}
if _, err := r.Seek(4, io.SeekCurrent); err != nil {
return "", err
}
name, err := read4ByteAlignedString(r)
if err != nil {
return "", err
}
if name == "#Pdb" {
if _, err := r.Seek(int64(offset), io.SeekStart); err != nil {
return "", err
}
b := make([]byte, 16)
if _, err := r.Read(b); err != nil {
return "", err
}
data1 := binary.LittleEndian.Uint32(b[0:4])
data2 := binary.LittleEndian.Uint16(b[4:6])
data3 := binary.LittleEndian.Uint16(b[6:8])
data4 := b[8:16]
return fmt.Sprintf("%08x%04x%04x%04x%012x", data1, data2, data3, data4[:2], data4[2:]), nil
}
}
return "", ErrMissingPdbStream
}
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