mtcontrib/mtsatellite
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Simplifications when decoding blocks from database to save some memory allocations.

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This commit is contained in:
Sascha L. Teichmann 2015-06-21 22:47:06 +02:00
parent 5c239a7b60
commit 2d00eb9567
2 changed files with 11 additions and 14 deletions
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5
cmd/mtseeder/main.go
View File

@ -45,10 +45,9 @@ func main() {
flag.Parse() flag.Parse()
var err error
if !skipBaseLevel { if !skipBaseLevel {
address := fmt.Sprintf("%s:%d", host, port) address := fmt.Sprintf("%s:%d", host, port)
if err = createBaseLevel( if err := createBaseLevel(
address, address,
xMin, zMin, xMax, zMax, xMin, zMin, xMax, zMax,
transparent, transparent,
@ -59,7 +58,7 @@ func main() {
} }
} }
if !skipPyramid { if !skipPyramid {
if err = createPyramid(outDir, numWorkers); err != nil { if err := createPyramid(outDir, numWorkers); err != nil {
log.Fatalf("Creating pyramid tiles failed: %s", err) log.Fatalf("Creating pyramid tiles failed: %s", err)
} }
} }

20
common/block.go
View File

@ -77,29 +77,31 @@ func NewDecodedBlock(data []byte, colors *Colors) (db *DecodedBlock, err error)
offset = 4 offset = 4
} }
buf := NewposBuf(data[offset:]) buf := posBuf{Data: data[offset:]}
var zr io.ReadCloser var zr io.ReadCloser
if zr, err = zlib.NewReader(buf); err != nil { if zr, err = zlib.NewReader(&buf); err != nil {
return return
} }
var mapContent []byte mapContent := make([]byte, uncompressedLen)
mapContent, err = ioutil.ReadAll(zr)
var k int
k, err = io.ReadFull(zr, mapContent)
zr.Close() zr.Close()
if err != nil { if err != nil {
return return
} }
if uncompressedLen != len(mapContent) { if k != uncompressedLen {
err = ErrMapContentSizeMismatch err = ErrMapContentSizeMismatch
return return
} }
offset += buf.Pos offset += buf.Pos + 4
buf.Pos = 0 buf.Pos = 0
buf.Data = data[offset:] buf.Data = data[offset:]
if zr, err = zlib.NewReader(buf); err != nil { if zr, err = zlib.NewReader(&buf); err != nil {
return return
} }
@ -204,10 +206,6 @@ func (db *DecodedBlock) Content(x, y, z int) (content int32, found bool) {
return return
} }
func NewposBuf(data []byte) *posBuf {
return &posBuf{Data: data}
}
func (pb *posBuf) Read(p []byte) (int, error) { func (pb *posBuf) Read(p []byte) (int, error) {
pl := len(p) pl := len(p)
ml := len(pb.Data) ml := len(pb.Data)