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- pbmap: faster coordinate decoding

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This commit is contained in:
Hannes Janetzek 2012-08-07 14:16:52 +02:00
parent 5df4ac883a
commit 78b271c633
1 changed files with 66 additions and 7 deletions
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73
src/org/mapsforge/database/pbmap/MapDatabase.java
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@ -153,7 +153,7 @@ public class MapDatabase implements IMapDatabase {
return null;
}
private static final int BUFFER_SIZE = 32768;
private static final int BUFFER_SIZE = 65536;
private final byte[] buffer = new byte[BUFFER_SIZE];
private int bufferPos;
private int bufferSize;
@ -356,19 +356,78 @@ public class MapDatabase implements IMapDatabase {
int bytes = decodeVarint32();
int cnt = 0;
int end = bytesRead + bytes;
// int end = bytesRead + bytes;
while (bytesRead < end) {
int val = decodeZigZag32(decodeVarint32());
readBuffer(bytes);
int pos = bufferPos;
int end = pos + bytes;
float[] coords = tmpCoords;
byte[] buf = buffer;
int result;
while (pos < end) {
if (cnt >= MAX_WAY_COORDS) {
MAX_WAY_COORDS += 128;
Log.d(TAG, "increase coords array " + MAX_WAY_COORDS);
float[] tmp = new float[MAX_WAY_COORDS];
System.arraycopy(tmpCoords, 0, tmp, 0, cnt);
tmpCoords = tmp;
System.arraycopy(coords, 0, tmp, 0, cnt);
tmpCoords = coords = tmp;
}
tmpCoords[cnt++] = val;
byte tmp = buf[pos++];
if (tmp >= 0) {
result = tmp;
} else {
result = tmp & 0x7f;
if ((tmp = buf[pos++]) >= 0) {
result |= tmp << 7;
} else {
result |= (tmp & 0x7f) << 7;
if ((tmp = buf[pos++]) >= 0) {
result |= tmp << 14;
} else {
result |= (tmp & 0x7f) << 14;
if ((tmp = buf[pos++]) >= 0) {
result |= tmp << 21;
} else {
result |= (tmp & 0x7f) << 21;
result |= (tmp = buf[pos++]) << 28;
if (tmp < 0) {
int i = 0;
// Discard upper 32 bits.
while (i++ < 5) {
if (buf[pos++] >= 0)
break;
}
if (i == 5)
// FIXME throw some poo
Log.d(TAG, "EEK malformedVarint");
}
}
}
}
}
coords[cnt++] = (result >>> 1) ^ -(result & 1);
}
bufferPos = pos;
bytesRead += bytes;
// while (bytesRead < end) {
// int val = decodeZigZag32(decodeVarint32());
// if (cnt >= MAX_WAY_COORDS) {
// MAX_WAY_COORDS += 128;
// Log.d(TAG, "increase coords array " + MAX_WAY_COORDS);
// float[] tmp = new float[MAX_WAY_COORDS];
// System.arraycopy(tmpCoords, 0, tmp, 0, cnt);
// tmpCoords = tmp;
// }
// tmpCoords[cnt++] = val;
// }
return cnt;
}