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Extensions break on path change (Issue portapps/phyrox-portable#2)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/binary" | ||
| "io/ioutil" | ||
| "os" | ||
|
|
||
| "github.com/pierrec/lz4" | ||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| const ( | ||
| mozLz4Header = "mozLz40\x00" | ||
| mozLz4DecompSize = 4 | ||
| ) | ||
|
|
||
| func mozLz4Decompress(filename string) ([]byte, error) { | ||
| file, err := os.Open(filename) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| header := make([]byte, len(mozLz4Header)) | ||
| _, err = file.Read(header) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "couldn't read header") | ||
| } | ||
| if string(header) != mozLz4Header { | ||
| return nil, errors.New("no mozLz4 header") | ||
| } | ||
|
|
||
| var size uint32 | ||
| err = binary.Read(file, binary.LittleEndian, &size) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "couldn't read size") | ||
| } | ||
|
|
||
| src, err := ioutil.ReadAll(file) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "couldn't read compressed data") | ||
| } | ||
|
|
||
| out := make([]byte, size) | ||
| _, err = lz4.UncompressBlock(src, out) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "couldn't decompress data") | ||
| } | ||
|
|
||
| return out, nil | ||
| } | ||
|
|
||
| func mozLz4Compress(src []byte) ([]byte, error) { | ||
| out := new(bytes.Buffer) | ||
|
|
||
| _, err := out.Write([]byte(mozLz4Header)) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "couldn't write header") | ||
| } | ||
|
|
||
| err = binary.Write(out, binary.LittleEndian, uint32(len(src))) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "couldn't encode length") | ||
| } | ||
|
|
||
| buf := make([]byte, 10*len(src)) | ||
| sz, err := lz4.CompressBlockHC(src, buf, -1) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "couldn't compress data") | ||
| } | ||
| if sz == 0 { | ||
| return nil, errors.New("data incompressible") | ||
| } | ||
|
|
||
| _, err = out.Write(buf[:sz]) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "couldn't write compressed data") | ||
| } | ||
|
|
||
| return out.Bytes(), nil | ||
| } |