mirror of
https://github.com/OpenDiablo2/OpenDiablo2
synced 2024-09-06 11:34:15 -04:00
99 lines
2.2 KiB
Go
99 lines
2.2 KiB
Go
package mpq
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import (
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"fmt"
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"path/filepath"
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"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
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"github.com/OpenDiablo2/OpenDiablo2/d2common/d2loader/asset"
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"github.com/OpenDiablo2/OpenDiablo2/d2common/d2loader/asset/types"
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)
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const (
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bufLength = 32
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)
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// static check that Asset implements Asset
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var _ asset.Asset = &Asset{}
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// Asset represents a file record within an MPQ archive
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type Asset struct {
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stream d2interface.DataStream
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data []byte
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path string
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source *Source
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}
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// Type returns the asset type
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func (a *Asset) Type() types.AssetType {
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return types.Ext2AssetType(filepath.Ext(a.Path()))
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}
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// Source returns the source of this asset
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func (a *Asset) Source() asset.Source {
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return a.source
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}
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// Path returns the sub-path (within the source) of this asset
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func (a *Asset) Path() string {
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return a.path
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}
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// Read will read asset data into the given buffer
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func (a *Asset) Read(buf []byte) (n int, err error) {
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return a.stream.Read(buf)
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}
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// Seek will seek the read position for the next read operation
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func (a *Asset) Seek(offset int64, whence int) (n int64, err error) {
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return a.stream.Seek(offset, whence)
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}
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// Close will seek the read position for the next read operation
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func (a *Asset) Close() (err error) {
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// Calling a.stream.Close() will set the stream to nil, we dont want to do that.
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// Because this asset gets cached, it may get retrieved again and used, in which
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// case we will want the stream ready. So, instead of closing, we just seek back to the start.
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// The garbage collector should get around to it if it ever gets ejected from the cache.
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_, err = a.Seek(0, 0)
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return err
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}
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// Data returns the raw file data as a slice of bytes
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func (a *Asset) Data() ([]byte, error) {
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if a.stream == nil {
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return nil, fmt.Errorf("asset has no file: %s", a.Path())
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}
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if a.data != nil {
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return a.data, nil
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}
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_, seekErr := a.Seek(0, 0)
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if seekErr != nil {
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return nil, seekErr
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}
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buf := make([]byte, bufLength)
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data := make([]byte, 0)
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for {
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numBytesRead, readErr := a.Read(buf)
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data = append(data, buf[:numBytesRead]...)
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if readErr != nil || numBytesRead == 0 {
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break
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}
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}
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a.data = data
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return data, nil
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}
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// String returns the path
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func (a *Asset) String() string {
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return a.Path()
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}
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