[hexxy] DEV branch - extremely speed up hex encoding

color.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"bytes"
 	"strconv"
 	"unsafe"
 )
@@ -11,12 +10,12 @@ const CLR = "\x1b[0m"
 
 var ESC = []byte{0x5c, 0x78, 0x31, 0x62, 0x5b}
 var CLEAR = []byte{0x5c, 0x78, 0x31, 0x62, 0x5b, 0x30, 0x6d}
+var CLRR = []byte("\x1b[0m")
 
 type Color struct {
 	disable bool
 	values  [256]string
-	bvalues [256][]byte
-	cvalues map[byte][]byte
+	cvalues [256][]byte
 }
 
 func (c *Color) Compute() {
@@ -34,6 +33,7 @@ func (c *Color) Compute() {
 			bg = ""
 		}
 		c.values[i] = bg + fg
+		c.cvalues[i] = []byte(bg + fg)
 	}
 }
 
@@ -42,64 +42,9 @@ func (c *Color) Colorize(s string, clr byte) string {
 	return c.values[clr] + s + NOCOLOR
 }
 
-func (c *Color) ColorizeBytes(s string, byteColor []byte) []byte {
-	const NOCOLOR = "\x1b[0m"
-	b := ByteArrayToInt(byteColor)
-	return []byte(c.values[b] + s + NOCOLOR)
-}
-
-func (c *Color) ComputeBytes() {
-	const WHITEB = "\x1b[1;37m"
-	for i := 0; i < 256; i++ {
-		var fg, bg string
-		b := byte(i)
-
-		lowVis := i == 0 || (i >= 16 && i <= 20) || (i >= 232 && i <= 242)
-
-		if lowVis {
-			fg = WHITEB + "\x1b[38;5;" + "255" + "m"
-			bg = "\x1b[48;5;" + strconv.Itoa(int(i)) + "m"
-		} else {
-			fg = "\x1b[38;5;" + strconv.Itoa(int(i)) + "m"
-			bg = ""
-		}
-
-		c.values[i] = bg + fg
-		c.cvalues[b] = []byte(bg + fg)
-	}
-}
-
-func (c *Color) xComputeBytes() {
-	const Marker = '\x1b'
-	var b bytes.Buffer
-
-	for i := 0; i < 256; i++ {
-		// var fg, bg []byte
-		b.Write(ESC)
-
-		// x := string(i)
-		// y := []byte(x)
-
-		lowVis := i == 0 || (i >= 16 && i <= 20) || (i >= 232 && i <= 242)
-		if lowVis {
-			b.Write([]byte{'[', '1', ';', '3', '7', 'm'})
-			b.Write(ESC)
-			b.Write([]byte{'[', '4', '8', ';', '5'})
-			bg := make([]byte, 3)
-			bg = IntToByteArray(i)
-			b.Write(bg)
-			b.WriteByte('m')
-		} else {
-			b.Write([]byte{'[', '3', '8', ';', '5'})
-			fg := make([]byte, 3)
-			fg = IntToByteArray(i)
-			b.Write(fg)
-			b.WriteByte('m')
-		}
-		// c.values[i] = bg + fg
-		// c.bvalues[i] = bytes.Join([]byte(bg), []byte(fg))
-		c.bvalues[i] = b.Bytes()
-	}
+// function to colorize bytes - avoiding string conversions
+func (c *Color) Colorize2(clr byte) ([]byte, []byte) {
+	return c.cvalues[clr], CLRR
 }
 
 func IntToByteArray(num int) []byte {

hexxy.go

@@ -7,6 +7,7 @@ import (
 	"io"
 	"log"
 	"os"
+	"runtime/pprof"
 	"strconv"
 
 	"github.com/jessevdk/go-flags"
@@ -42,8 +43,8 @@ const (
 )
 
 const (
-	ldigits = "0123456789abcdef"
 	udigits = "0123456789ABCDEF"
+	ldigits = "0123456789abcdef"
 )
 
 var (
@@ -64,6 +65,10 @@ var (
 	bar          = []byte("|")
 )
 
+var (
+	STDOUT_ISPIPE bool
+)
+
 func inputIsPipe() bool {
 	stat, _ := os.Stdin.Stat()
 	return stat.Mode()&os.ModeCharDevice != os.ModeCharDevice
@@ -263,9 +268,16 @@ func XXD(r io.Reader, w io.Writer, filename string, color *Color) error {
 			for i, k := 0, octs; i < n; i, k = i+1, k+octs {
 				hexEncode(char, line[i:i+1], caps)
 
-				// s := color.Colorize(string(char), byte(i))
-				// w.Write([]byte(s))
-				w.Write(char)
+				if !opts.NoColor && !STDOUT_ISPIPE {
+					i := line[i : i+1][0]
+					b, c := color.Colorize2(i)
+					w.Write(b)
+					w.Write(char)
+					w.Write(c)
+				} else {
+					w.Write(char)
+				}
+
 				c++
 
 				if k == octs*groupSize {
@@ -438,7 +450,9 @@ func main() {
 		log.Fatal(err)
 	}
 
-	if !inputIsPipe() && len(args) == 0 {
+	STDOUT_ISPIPE = inputIsPipe()
+
+	if !STDOUT_ISPIPE && len(args) == 0 {
 		parser.WriteHelp(os.Stderr)
 		fmt.Print(usage_msg)
 		os.Exit(0)
@@ -448,6 +462,12 @@ func main() {
 		Debug = log.Printf
 	}
 
+	f, err := os.Create("mem.cpu")
+	defer f.Close()
+
+	pprof.StartCPUProfile(f)
+	defer pprof.StopCPUProfile()
+
 	if err := Hexxy(args); err != nil {
 		log.Fatal(err)
 	}