initial files + hexdumpc

Author: fileformat

.editorconfig

@@ -0,0 +1,16 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = tab
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{json,yaml}]
+indent_size = 2
+indent_style = space

.gitignore

@@ -0,0 +1,22 @@
+*~
+**/*#
+.cache
+*.class
+crash.log
+_data/build.json
+.DS_Store
+.env
+Gemfile.lock
+.idea/
+.jekyll-metadata
+node_modules
+*.pyc
+.sass-cache/
+_site/
+tmp/
+_tmp/
+tmp-*
+*.tmp
+venv/
+.venv/
+_work/

cmd/hexdumpc/hexdumpc.go

@@ -0,0 +1,113 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/spf13/pflag"
+)
+
+func hexdump(fileName string, offset, length int64) error {
+
+	// Open the file
+	file, err := os.Open(fileName)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	// Seek to the offset
+	if offset > 0 {
+		if _, err := file.Seek(offset, io.SeekStart); err != nil {
+			return err
+		}
+	}
+
+	reader := bufio.NewReader(file)
+
+	var count int64 = 0
+	for {
+		// Read a chunk of data
+		buf := make([]byte, 16)
+		n, err := reader.Read(buf)
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+
+		printLine(offset+count, buf[:n])
+
+		count += int64(n)
+		if length > 0 && count >= length {
+			break
+		}
+	}
+	return nil
+}
+
+func printLine(offset int64, buf []byte) {
+	// Print the offset
+	fmt.Printf("%08x  ", offset)
+
+	// Print the hex values
+	for i := 0; i < len(buf); i++ {
+		if i%8 == 0 && i != 0 {
+			fmt.Print(" ")
+		}
+		fmt.Printf("%02x ", buf[i])
+	}
+	// Pad the line to 48 characters
+	for i := len(buf); i < 16; i++ {
+		if i%8 == 0 && i != 0 {
+			fmt.Print(" ")
+		}
+		fmt.Print("   ")
+	}
+
+	// Print the ASCII values
+	fmt.Print(" |")
+	for _, b := range buf {
+		if b >= 32 && b <= 126 {
+			fmt.Printf("%c", b)
+		} else {
+			fmt.Print(".")
+		}
+	}
+	// Pad the line to 16 characters
+	for i := len(buf); i < 16; i++ {
+		fmt.Print(" ")
+	}
+	fmt.Println("|")
+}
+
+func main() {
+
+	var head = pflag.Int64("head", 0, "number of bytes to read at the beginning of the file")
+	var offset = pflag.Int64("offset", 0, "number of bytes to skip at the beginning of the file")
+	var length = pflag.Int64("length", 0, "number of bytes to read from the file")
+	//LATER: support for tail
+
+	pflag.Parse()
+
+	if *head > 0 {
+		*offset = 0
+		*length = *head
+	}
+
+	args := pflag.Args()
+	if len(args) == 0 {
+		args = []string{"-"}
+	}
+	for _, arg := range args {
+		if arg == "-" {
+			arg = "/dev/stdin"
+		}
+
+		if err := hexdump(arg, *offset, *length); err != nil {
+			panic(err)
+		}
+	}
+}

docs/favicon.ico

@@ -0,0 +1,5 @@
+module github.com/FileFormatInfo/fftools
+
+go 1.23.2
+
+require github.com/spf13/pflag v1.0.6 // indirect

docs/favicon.svg

@@ -0,0 +1,2 @@
+github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
+github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=