Initial commit

I can parse some of the data files, and extract individual frames from .obj
files. I can't yet convert those frames into something viewable.

internal/data/data.go

@@ -0,0 +1,107 @@
+package data
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+	"io/ioutil"
+	"strconv"
+)
+
+var hashComment = []byte("#")
+
+type CompassPoints struct {
+	N  int
+	NE int
+	E  int
+	SE int
+	S  int
+	SW int
+	W  int
+	NW int
+}
+
+type Range struct {
+	Start int
+	End   int
+}
+
+func fileToScanner(filename string) (*bufio.Scanner, error) {
+	data, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	return bufio.NewScanner(bytes.NewReader(data)), nil
+}
+
+func consumeString(scanner *bufio.Scanner) (string, error) {
+	for scanner.Scan() {
+		line := scanner.Bytes()
+
+		if len(line) == 0 || line[0] == hashComment[0] { // Most .dat files use # for comments
+			continue
+		}
+
+		comment := bytes.Index(line, hashComment)
+		if comment > 0 {
+			line = line[0:comment]
+		}
+
+		return string(bytes.TrimRight(line, "\r\n\t ")), nil
+	}
+
+	err := scanner.Err()
+	if err == nil {
+		return "", io.EOF
+	}
+
+	return "", err
+}
+
+func consumeInt(scanner *bufio.Scanner) (int, error) {
+	str, err := consumeString(scanner)
+	if err != nil {
+		return 0, err
+	}
+
+	return strconv.Atoi(str)
+}
+
+func consumeIntPtr(to *int, scanner *bufio.Scanner) error {
+	val, err := consumeInt(scanner)
+	if err != nil {
+		return err
+	}
+
+	*to = val
+	return nil
+}
+
+func consumeIntPtrs(scanner *bufio.Scanner, ptrs ...*int) error {
+	for _, ptr := range ptrs {
+		if err := consumeIntPtr(ptr, scanner); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func consumeRange(scanner *bufio.Scanner) (Range, error) {
+	var out Range
+
+	err := consumeIntPtrs(scanner, &out.Start, &out.End)
+	return out, err
+}
+
+func consumeCompassPoints(scanner *bufio.Scanner) (CompassPoints, error) {
+	var out CompassPoints
+
+	err := consumeIntPtrs(
+		scanner,
+		&out.N, &out.NE, &out.E, &out.SE, &out.S, &out.SW, &out.W, &out.NW,
+	)
+
+	return out, err
+}