1 files changed, 142 insertions, 0 deletions
diff --git a/vendor/github.com/daaku/go.zipexe/zipexe.go b/vendor/github.com/daaku/go.zipexe/zipexe.go
new file mode 100644
index 00000000..60046062
--- /dev/null
+++ b/vendor/github.com/daaku/go.zipexe/zipexe.go
@@ -0,0 +1,142 @@
+// Package zipexe attempts to open an executable binary file as a zip file.
+package zipexe
+
+import (
+	"archive/zip"
+	"debug/elf"
+	"debug/macho"
+	"debug/pe"
+	"errors"
+	"io"
+	"os"
+)
+
+// Opens a zip file by path.
+func Open(path string) (*zip.Reader, error) {
+	_, rd, err := OpenCloser(path)
+	return rd, err
+}
+
+// OpenCloser is like Open but returns an additional Closer to avoid leaking open files.
+func OpenCloser(path string) (io.Closer, *zip.Reader, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, nil, err
+	}
+	finfo, err := file.Stat()
+	if err != nil {
+		return nil, nil, err
+	}
+	zr, err := NewReader(file, finfo.Size())
+	if err != nil {
+		return nil, nil, err
+	}
+	return file, zr, nil
+}
+
+// Open a zip file, specially handling various binaries that may have been
+// augmented with zip data.
+func NewReader(rda io.ReaderAt, size int64) (*zip.Reader, error) {
+	handlers := []func(io.ReaderAt, int64) (*zip.Reader, error){
+		zip.NewReader,
+		zipExeReaderMacho,
+		zipExeReaderElf,
+		zipExeReaderPe,
+	}
+
+	for _, handler := range handlers {
+		zfile, err := handler(rda, size)
+		if err == nil {
+			return zfile, nil
+		}
+	}
+	return nil, errors.New("Couldn't Open As Executable")
+}
+
+// zipExeReaderMacho treats the file as a Mach-O binary
+// (Mac OS X / Darwin executable) and attempts to find a zip archive.
+func zipExeReaderMacho(rda io.ReaderAt, size int64) (*zip.Reader, error) {
+	file, err := macho.NewFile(rda)
+	if err != nil {
+		return nil, err
+	}
+
+	var max int64
+	for _, load := range file.Loads {
+		seg, ok := load.(*macho.Segment)
+		if ok {
+			// Check if the segment contains a zip file
+			if zfile, err := zip.NewReader(seg, int64(seg.Filesz)); err == nil {
+				return zfile, nil
+			}
+
+			// Otherwise move end of file pointer
+			end := int64(seg.Offset + seg.Filesz)
+			if end > max {
+				max = end
+			}
+		}
+	}
+
+	// No zip file within binary, try appended to end
+	section := io.NewSectionReader(rda, max, size-max)
+	return zip.NewReader(section, section.Size())
+}
+
+// zipExeReaderPe treats the file as a Portable Exectuable binary
+// (Windows executable) and attempts to find a zip archive.
+func zipExeReaderPe(rda io.ReaderAt, size int64) (*zip.Reader, error) {
+	file, err := pe.NewFile(rda)
+	if err != nil {
+		return nil, err
+	}
+
+	var max int64
+	for _, sec := range file.Sections {
+		// Check if this section has a zip file
+		if zfile, err := zip.NewReader(sec, int64(sec.Size)); err == nil {
+			return zfile, nil
+		}
+
+		// Otherwise move end of file pointer
+		end := int64(sec.Offset + sec.Size)
+		if end > max {
+			max = end
+		}
+	}
+
+	// No zip file within binary, try appended to end
+	section := io.NewSectionReader(rda, max, size-max)
+	return zip.NewReader(section, section.Size())
+}
+
+// zipExeReaderElf treats the file as a ELF binary
+// (linux/BSD/etc... executable) and attempts to find a zip archive.
+func zipExeReaderElf(rda io.ReaderAt, size int64) (*zip.Reader, error) {
+	file, err := elf.NewFile(rda)
+	if err != nil {
+		return nil, err
+	}
+
+	var max int64
+	for _, sect := range file.Sections {
+		if sect.Type == elf.SHT_NOBITS {
+			continue
+		}
+
+		// Check if this section has a zip file
+		if zfile, err := zip.NewReader(sect, int64(sect.Size)); err == nil {
+			return zfile, nil
+		}
+
+		// Otherwise move end of file pointer
+		end := int64(sect.Offset + sect.Size)
+		if end > max {
+			max = end
+		}
+	}
+
+	// No zip file within binary, try appended to end
+	section := io.NewSectionReader(rda, max, size-max)
+	return zip.NewReader(section, section.Size())
+}