.gitignore added

[dotfiles/.git] / .config / coc / extensions / coc-go-data / tools / pkg / mod / golang.org / x / tools@v0.1.1-0.20210319172145-bda8f5cee399 / go / internal / gcimporter / exportdata.go

diff --git a/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.1.1-0.20210319172145-bda8f5cee399/go/internal/gcimporter/exportdata.go b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.1.1-0.20210319172145-bda8f5cee399/go/internal/gcimporter/exportdata.go
new file mode 100644 (file)
index 0000000..f33dc56
--- /dev/null
+++ b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.1.1-0.20210319172145-bda8f5cee399/go/internal/gcimporter/exportdata.go
@@ -0,0 +1,93 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This file is a copy of $GOROOT/src/go/internal/gcimporter/exportdata.go.
+
+// This file implements FindExportData.
+
+package gcimporter
+
+import (
+       "bufio"
+       "fmt"
+       "io"
+       "strconv"
+       "strings"
+)
+
+func readGopackHeader(r *bufio.Reader) (name string, size int, err error) {
+       // See $GOROOT/include/ar.h.
+       hdr := make([]byte, 16+12+6+6+8+10+2)
+       _, err = io.ReadFull(r, hdr)
+       if err != nil {
+               return
+       }
+       // leave for debugging
+       if false {
+               fmt.Printf("header: %s", hdr)
+       }
+       s := strings.TrimSpace(string(hdr[16+12+6+6+8:][:10]))
+       size, err = strconv.Atoi(s)
+       if err != nil || hdr[len(hdr)-2] != '`' || hdr[len(hdr)-1] != '\n' {
+               err = fmt.Errorf("invalid archive header")
+               return
+       }
+       name = strings.TrimSpace(string(hdr[:16]))
+       return
+}
+
+// FindExportData positions the reader r at the beginning of the
+// export data section of an underlying GC-created object/archive
+// file by reading from it. The reader must be positioned at the
+// start of the file before calling this function. The hdr result
+// is the string before the export data, either "$$" or "$$B".
+//
+func FindExportData(r *bufio.Reader) (hdr string, err error) {
+       // Read first line to make sure this is an object file.
+       line, err := r.ReadSlice('\n')
+       if err != nil {
+               err = fmt.Errorf("can't find export data (%v)", err)
+               return
+       }
+
+       if string(line) == "!<arch>\n" {
+               // Archive file. Scan to __.PKGDEF.
+               var name string
+               if name, _, err = readGopackHeader(r); err != nil {
+                       return
+               }
+
+               // First entry should be __.PKGDEF.
+               if name != "__.PKGDEF" {
+                       err = fmt.Errorf("go archive is missing __.PKGDEF")
+                       return
+               }
+
+               // Read first line of __.PKGDEF data, so that line
+               // is once again the first line of the input.
+               if line, err = r.ReadSlice('\n'); err != nil {
+                       err = fmt.Errorf("can't find export data (%v)", err)
+                       return
+               }
+       }
+
+       // Now at __.PKGDEF in archive or still at beginning of file.
+       // Either way, line should begin with "go object ".
+       if !strings.HasPrefix(string(line), "go object ") {
+               err = fmt.Errorf("not a Go object file")
+               return
+       }
+
+       // Skip over object header to export data.
+       // Begins after first line starting with $$.
+       for line[0] != '$' {
+               if line, err = r.ReadSlice('\n'); err != nil {
+                       err = fmt.Errorf("can't find export data (%v)", err)
+                       return
+               }
+       }
+       hdr = string(line)
+
+       return
+}