Adding some documentation

2 files changed, 24 insertions, 0 deletions

diff --git a/nbt/compressed.go b/nbt/compressed.go
index 3ca31f5..a16308f 100644
--- a/nbt/compressed.go
+++ b/nbt/compressed.go
@@ -8,6 +8,7 @@ import (
 
 // Some helpers for reading / writing compressed NBT data, since NBT data is often compressed.
 
+// ReadGzipdNamedTag reads a gzip compressed named tag. See ReadNamedTags for more info.
 func ReadGzipdNamedTag(r io.Reader) (Tag, string, error) {
 	decomp, err := gzip.NewReader(r)
 	if err != nil {
@@ -17,11 +18,13 @@ func ReadGzipdNamedTag(r io.Reader) (Tag, string, error) {
 	return ReadNamedTag(decomp)
 }
 
+// WriteGzipdNamedTag writes a gzip compressed named tag. See WriteNamedTag for more info.
 func WriteGzipdNamedTag(w io.Writer, name string, tag Tag) error {
 	comp := gzip.NewWriter(w)
 	return WriteNamedTag(comp, name, tag)
 }
 
+// ReadZlibdNamedTag reads a zlib compressed named tag. See ReadNamedTags for more info.
 func ReadZlibdNamedTag(r io.Reader) (Tag, string, error) {
 	decomp, err := zlib.NewReader(r)
 	if err != nil {
@@ -31,6 +34,7 @@ func ReadZlibdNamedTag(r io.Reader) (Tag, string, error) {
 	return ReadNamedTag(decomp)
 }
 
+// WriteZlibdNamedTag writes a zlib compressed named tag. See WriteNamedTag for more info.
 func WriteZlibdNamedTag(w io.Writer, name string, tag Tag) error {
 	comp := zlib.NewWriter(w)
 	return WriteNamedTag(comp, name, tag)
diff --git a/nbt/nbt.go b/nbt/nbt.go
index 12afb5d..fe9f7a4 100644
--- a/nbt/nbt.go
+++ b/nbt/nbt.go
@@ -1,3 +1,4 @@
+// Package nbt provides functions for reading and writing NBT encoded data.
 package nbt
 
 import (
@@ -10,11 +11,27 @@ import (
 	"strconv"
 )
 
+// Tag holds the data of an NBT tag. Type is a TAG_* value.
+//
+// The type of Payload depends on Type:
+//
+// 	TAG_Byte       -- byte
+// 	TAG_Short      -- int16
+// 	TAG_Int        -- int32
+// 	TAG_Long       -- int64
+// 	TAG_Float      -- float32
+// 	TAG_Double     -- float64
+// 	TAG_Byte_Array -- []byte
+// 	TAG_String     -- string
+// 	TAG_List       -- TagList
+// 	TAG_Compound   -- TagCompound
+// 	TAG_Int_Array  -- []int32
 type Tag struct {
 	Type    TagType
 	Payload interface{}
 }
 
+// TagList is the payload of a TAG_List Tag. The type of the Elems depends on Type (see docu of Tag).
 type TagList struct {
 	Type  TagType
 	Elems []interface{}
@@ -65,6 +82,7 @@ func (t Tag) String() string {
 	return s
 }
 
+// TagCompund is the payload of a TAG_Compound.
 type TagCompound map[string]Tag
 
 func readTagData(r io.Reader, tt TagType) (interface{}, error) {
@@ -176,6 +194,7 @@ func readTagData(r io.Reader, tt TagType) (interface{}, error) {
 	return nil, errors.New("Unknown tag type")
 }
 
+// ReadNamedTag reads a named Tag from an io.Reader. It returns the Tag, the tags Name and an error.
 func ReadNamedTag(r io.Reader) (Tag, string, error) {
 	_tt, err := kagus.ReadByte(r)
 	if err != nil {
@@ -273,6 +292,7 @@ func writeTagData(w io.Writer, tt TagType, data interface{}) error {
 	return errors.New("Unknown tage type")
 }
 
+// WriteNamedTag writes a named Tag to an io.Writer.
 func WriteNamedTag(w io.Writer, name string, tag Tag) error {
 	if err := writeByte(w, byte(tag.Type)); err != nil {
 		return err