82 lines
1.4 KiB
Go
82 lines
1.4 KiB
Go
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package main
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import (
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"fmt"
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"io"
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"log"
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"github.com/veandco/go-sdl2/sdl"
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)
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var rwops *sdl.RWops
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var writer io.Writer
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var reader io.Reader
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var seeker io.Seeker
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var closer io.Closer
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var data = []byte{0, 10, 20, 30}
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var err error
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func size() {
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if n, err := rwops.Size(); err != nil {
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log.Fatal(err)
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} else {
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fmt.Println("size:", n)
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}
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}
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func read() {
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buf := make([]byte, 4)
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reader.Read(buf[:])
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fmt.Println("read:", buf[0], buf[1], buf[2], buf[3])
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}
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func tell() {
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if n, err := rwops.Tell(); err != nil {
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log.Fatal(err)
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} else {
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fmt.Println("tell:", n)
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}
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}
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func seek() {
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// Seek
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if n, err := seeker.Seek(0, io.SeekStart); err != nil {
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log.Fatal(err)
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} else {
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fmt.Println("seek: offset is", n)
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}
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}
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func write() {
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if n, err := writer.Write([]byte{40, 50, 60, 70}); err != nil {
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log.Fatal(err)
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} else {
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fmt.Println("write:", n, "bytes")
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}
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}
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func main() {
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rwops, err = sdl.RWFromMem(data)
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if err != nil {
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log.Println(err)
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}
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writer = rwops
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reader = rwops
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seeker = rwops
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closer = rwops
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defer closer.Close()
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size() // Print RWops data size
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tell() // Print current data offset
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read() // Read data via RWops
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tell() // Print current data offset
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seek() // Seek to start of the data
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write() // Write some data via RWops
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tell() // Print current data offset
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seek() // Seek to start of the data
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tell() // Print current data offset
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read() // Read data via RWops again
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}
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