Initial commit

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+indent_style = tab
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.gitignore

@@ -0,0 +1,2 @@
+.DS_Store
+private

fmp/fmp.go

@@ -0,0 +1,63 @@
+package fmp
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"time"
+)
+
+const (
+	magicSequence = "\x00\x01\x00\x00\x00\x02\x00\x01\x00\x05\x00\x02\x00\x02\xC0"
+	hbamSequence  = "HBAM7"
+
+	magicSize  = len(magicSequence)
+	hbamSize   = len(hbamSequence)
+	sectorSize = 4096
+)
+
+type FmpFile struct {
+	Stream          io.ReadSeeker
+	VersionDate     time.Time
+	ApplicationName string
+}
+
+func OpenFile(path string) (*FmpFile, error) {
+	stream, err := os.Open(path)
+	if err != nil {
+		if stream != nil {
+			stream.Close()
+		}
+		return nil, err
+	}
+	ctx := &FmpFile{Stream: stream}
+	if err := ctx.readHeader(); err != nil {
+		stream.Close()
+		return nil, err
+	}
+	return ctx, nil
+}
+
+func (ctx *FmpFile) readHeader() error {
+	buf := make([]byte, sectorSize)
+	_, err := ctx.Stream.Read(buf)
+	if err != nil {
+		return ErrRead
+	}
+	if !bytes.Equal(buf[:magicSize], []byte(magicSequence)) {
+		return ErrBadMagic
+	}
+	if !bytes.Equal(buf[magicSize:magicSize+hbamSize], []byte(hbamSequence)) {
+		return ErrBadMagic
+	}
+
+	ctx.VersionDate, err = time.Parse("06JAN02", string(buf[531:538]))
+	if err != nil {
+		return ErrBadHeader
+	}
+
+	appNameLength := int(buf[541])
+	ctx.ApplicationName = string(buf[542 : 542+appNameLength])
+
+	return nil
+}

fmp/fmp_error.go

@@ -0,0 +1,18 @@
+package fmp
+
+type FmpError string
+
+func (e FmpError) Error() string { return string(e) }
+
+var (
+	ErrRead               = FmpError("read error")
+	ErrBadMagic           = FmpError("bad magic number")
+	ErrBadHeader          = FmpError("bad header")
+	ErrUnsupportedCharset = FmpError("unsupported character set")
+	ErrBadSectorCount     = FmpError("bad sector count")
+	ErrNoFmemopen         = FmpError("no fmemopen")
+	ErrOpen               = FmpError("could not open file")
+	ErrSeek               = FmpError("seek failed")
+	ErrMalloc             = FmpError("malloc failed")
+	ErrUserAborted        = FmpError("user aborted")
+)

fmp/fmp_test.go

@@ -0,0 +1,16 @@
+package fmp
+
+import "testing"
+
+func TestOpenFile(t *testing.T) {
+	f, err := OpenFile("../files/Untitled.fmp12")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if f.ApplicationName != "Pro 12.0" {
+		t.Errorf("expected application name to be 'Pro 12.0', got '%s'", f.ApplicationName)
+	}
+	if f.VersionDate.Format("2006-01-02") != "2025-01-11" {
+		t.Errorf("expected version date to be '2025-01-11', got '%s'", f.VersionDate.Format("2006-01-02"))
+	}
+}

go.mod

@@ -0,0 +1,7 @@
+module fmp
+
+go 1.23.0
+
+toolchain go1.23.10
+
+require golang.org/x/text v0.26.0

go.sum

@@ -0,0 +1,2 @@
+golang.org/x/text v0.26.0 h1:P42AVeLghgTYr4+xUnTRKDMqpar+PtX7KWuNQL21L8M=
+golang.org/x/text v0.26.0/go.mod h1:QK15LZJUUQVJxhz7wXgxSy/CJaTFjd0G+YLonydOVQA=