Add support to inject a uint64 symbol

Bug: 31559095
Test: m blueprint_tools
Change-Id: Ifb46e21f5cac413abdf1dfe7fd6d31e06a7dbca5

symbol_inject/cmd/symbol_inject.go

@@ -88,7 +88,7 @@ func main() {
 		os.Exit(4)
 	}
 
-	err = symbol_inject.InjectSymbol(file, w, *symbol, *value, *from)
+	err = symbol_inject.InjectStringSymbol(file, w, *symbol, *value, *from)
 	if err != nil {
 		fmt.Fprintln(os.Stderr, err.Error())
 		os.Remove(*output)

symbol_inject/symbol_inject.go

@@ -16,6 +16,7 @@ package symbol_inject
 
 import (
 	"bytes"
+	"encoding/binary"
 	"fmt"
 	"io"
 	"math"
@@ -50,7 +51,7 @@ func OpenFile(r io.ReaderAt) (*File, error) {
 	return file, err
 }
 
-func InjectSymbol(file *File, w io.Writer, symbol, value, from string) error {
+func InjectStringSymbol(file *File, w io.Writer, symbol, value, from string) error {
 	offset, size, err := findSymbol(file, symbol)
 	if err != nil {
 		return err
@@ -75,13 +76,29 @@ func InjectSymbol(file *File, w io.Writer, symbol, value, from string) error {
 		}
 	}
 
-	return copyAndInject(file.r, w, offset, size, value)
-}
-
-func copyAndInject(r io.ReaderAt, w io.Writer, offset, size uint64, value string) (err error) {
 	buf := make([]byte, size)
 	copy(buf, value)
 
+	return copyAndInject(file.r, w, offset, buf)
+}
+
+func InjectUint64Symbol(file *File, w io.Writer, symbol string, value uint64) error {
+	offset, size, err := findSymbol(file, symbol)
+	if err != nil {
+		return err
+	}
+
+	if size != 8 {
+		return fmt.Errorf("symbol %q is not a uint64, it is %d bytes long", symbol, size)
+	}
+
+	buf := make([]byte, 8)
+	binary.LittleEndian.PutUint64(buf, value)
+
+	return copyAndInject(file.r, w, offset, buf)
+}
+
+func copyAndInject(r io.ReaderAt, w io.Writer, offset uint64, buf []byte) (err error) {
 	// Copy the first bytes up to the symbol offset
 	_, err = io.Copy(w, io.NewSectionReader(r, 0, int64(offset)))
 
@@ -91,7 +108,7 @@ func copyAndInject(r io.ReaderAt, w io.Writer, offset, size uint64, value string
 	}
 
 	// Write the remainder of the file
-	pos := int64(offset + size)
+	pos := int64(offset) + int64(len(buf))
 	if err == nil {
 		_, err = io.Copy(w, io.NewSectionReader(r, pos, 1<<63-1-pos))
 	}

symbol_inject/symbol_inject_test.go

@@ -23,32 +23,23 @@ import (
 func TestCopyAndInject(t *testing.T) {
 	s := "abcdefghijklmnopqrstuvwxyz"
 	testCases := []struct {
-		offset, size uint64
+		offset   uint64
-		value        string
+		buf      string
-		expected     string
+		expected string
 	}{
 		{
 			offset:   0,
-			size:     1,
+			buf:      "A",
-			value:    "A",
 			expected: "Abcdefghijklmnopqrstuvwxyz",
 		},
 		{
 			offset:   1,
-			size:     1,
+			buf:      "B",
-			value:    "B",
-			expected: "aBcdefghijklmnopqrstuvwxyz",
-		},
-		{
-			offset:   1,
-			size:     1,
-			value:    "BCD",
 			expected: "aBcdefghijklmnopqrstuvwxyz",
 		},
 		{
 			offset:   25,
-			size:     1,
+			buf:      "Z",
-			value:    "Z",
 			expected: "abcdefghijklmnopqrstuvwxyZ",
 		},
 	}
@@ -57,7 +48,7 @@ func TestCopyAndInject(t *testing.T) {
 		t.Run(strconv.Itoa(i), func(t *testing.T) {
 			in := bytes.NewReader([]byte(s))
 			out := &bytes.Buffer{}
-			copyAndInject(in, out, testCase.offset, testCase.size, testCase.value)
+			copyAndInject(in, out, testCase.offset, []byte(testCase.buf))
 
 			if out.String() != testCase.expected {
 				t.Errorf("expected %s, got %s", testCase.expected, out.String())