From 85494832cd90e9e283638bee8e14185aef384672 Mon Sep 17 00:00:00 2001
From: Aleksandr Zelenin <aleksandr@zelenin.me>
Date: Sat, 4 Jun 2022 22:38:40 +0300
Subject: [PATCH] ParseMeta

---
 datasheet/parser.go | 49 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 47 insertions(+), 2 deletions(-)

diff --git a/datasheet/parser.go b/datasheet/parser.go
index 2f823cf..036c867 100644
--- a/datasheet/parser.go
+++ b/datasheet/parser.go
@@ -13,7 +13,6 @@ func Parse(dataSheetFile *DataSheetFile) (*DataSheet, error) {
 	if err != nil {
 		return nil, err
 	}
-
 	defer file.Close()
 
 	meta, err := parseMeta(file)
@@ -29,6 +28,44 @@ func Parse(dataSheetFile *DataSheetFile) (*DataSheet, error) {
 	return dataSheet, nil
 }
 
+type Meta struct {
+	UniqueId string
+	DataType string
+}
+
+func ParseMeta(dataSheetFile *DataSheetFile) (*Meta, error) {
+	file, err := os.Open(dataSheetFile.GetPath())
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	meta, err := parseMeta(file)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = readNullTerminatedString(file)
+	if err != nil {
+		return nil, err
+	}
+
+	uniqueId, err := readNullTerminatedStringByOffset(file, meta.bodyOffset+meta.uniqueIdOffset)
+	if err != nil {
+		return nil, err
+	}
+
+	dataType, err := readNullTerminatedStringByOffset(file, meta.bodyOffset+meta.dataTypeOffset)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Meta{
+		UniqueId: uniqueId,
+		DataType: dataType,
+	}, nil
+}
+
 func parseMeta(r *os.File) (*meta, error) {
 	var headerSize int32
 
@@ -244,7 +281,6 @@ func parseMeta(r *os.File) (*meta, error) {
 }
 
 func parseBody(r *os.File, meta *meta) (*DataSheet, error) {
-	// OUTPUT
 	_, err := readNullTerminatedString(r)
 	if err != nil {
 		return nil, err
@@ -380,6 +416,15 @@ type DataSheet struct {
 	Rows     [][]string
 }
 
+func (dataSheet *DataSheet) GetColumnIndexes() map[string]int {
+	indexes := make(map[string]int, len(dataSheet.Columns))
+	for i, column := range dataSheet.Columns {
+		indexes[column.Name] = i
+	}
+
+	return indexes
+}
+
 type ColumnType int32
 
 const (