Add Seek for asset

raylib/core.go

@@ -5,8 +5,12 @@ package raylib
 #include <stdlib.h>
 */
 import "C"
-import "unsafe"
-import "reflect"
+
+import (
+	"io"
+	"reflect"
+	"unsafe"
+)
 
 // Some basic Defines
 const (
@@ -450,6 +454,12 @@ func NewBoundingBoxFromPointer(ptr unsafe.Pointer) BoundingBox {
 	return *(*BoundingBox)(ptr)
 }
 
+// Asset file
+type Asset interface {
+	io.ReadSeeker
+	io.Closer
+}
+
 // Close Window and Terminate Context
 func CloseWindow() {
 	C.CloseWindow()

raylib/platform_android.go

@@ -16,6 +16,7 @@ import "C"
 
 import (
 	"errors"
+	"fmt"
 	"io"
 	"unsafe"
 )
@@ -47,7 +48,7 @@ func androidMain(app *C.struct_android_app) {
 }
 
 // Open asset
-func OpenAsset(name string) (io.ReadCloser, error) {
+func OpenAsset(name string) (Asset, error) {
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
 
@@ -72,6 +73,14 @@ func (a *asset) Read(p []byte) (n int, err error) {
 	return n, nil
 }
 
+func (a *asset) Seek(offset int64, whence int) (int64, error) {
+	off := C.AAsset_seek(a.ptr, C.off_t(offset), C.int(whence))
+	if off == -1 {
+		return 0, errors.New(fmt.Sprintf("bad result for offset=%d, whence=%d", offset, whence))
+	}
+	return int64(off), nil
+}
+
 func (a *asset) Close() error {
 	C.AAsset_close(a.ptr)
 	return nil

raylib/platform_arm.go

@@ -55,7 +55,7 @@ func DisableCursor() {
 }
 
 // Open asset
-func OpenAsset(name string) (io.ReadCloser, error) {
+func OpenAsset(name string) (Asset, error) {
 	f, err := os.Open(name)
 	if err != nil {
 		return nil, err

raylib/platform_desktop.go

@@ -9,7 +9,6 @@ package raylib
 import "C"
 
 import (
-	"io"
 	"os"
 	"unsafe"
 )
@@ -86,7 +85,7 @@ func ClearDroppedFiles() {
 }
 
 // Open asset
-func OpenAsset(name string) (io.ReadCloser, error) {
+func OpenAsset(name string) (Asset, error) {
 	f, err := os.Open(name)
 	if err != nil {
 		return nil, err

raylib/rres.go

@@ -142,7 +142,7 @@ func LoadResource(fileName string) []byte {
 // Load resource from file by id
 // NOTE: Returns uncompressed data with parameters, search resource by id
 func LoadResourceByID(fileName string, rresID int) (data []byte) {
-	file, err := os.Open(fileName)
+	file, err := OpenAsset(fileName)
 	if err != nil {
 		TraceLog(LogWarning, "[%s] rRES raylib resource file could not be opened", fileName)
 		return
@@ -164,7 +164,7 @@ func LoadResourceByID(fileName string, rresID int) (data []byte) {
 	// Verify "rRES" identifier
 	id := fmt.Sprintf("%c", fileHeader.ID)
 	if id != "[r R E S]" {
-		TraceLog(LogWarning, "[%s] This is not a valid raylib resource file", fileName)
+		TraceLog(LogWarning, "[%s] is not a valid raylib resource file", fileName)
 		return
 	}