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- Added streaming protobufs using COBS
- Updated to Android Studio 2.0
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65 changes: 65 additions & 0 deletions
65
app/src/main/java/com/sureshjoshi/android/streamingprotobufexample/utils/CobsUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| package com.sureshjoshi.android.streamingprotobufexample.utils; | ||
|
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| public class CobsUtils { | ||
|
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| // Expected to be the entire packet to encode | ||
| public static byte[] encode(byte[] packet) { | ||
| if (packet == null | ||
| || packet.length == 0) { | ||
| return new byte[]{}; | ||
| } | ||
|
|
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| byte[] output = new byte[packet.length + 2]; | ||
| byte blockStartValue = 1; | ||
| int lastZeroIndex = 0; | ||
| int srcIndex = 0; | ||
| int destIndex = 1; | ||
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| while (srcIndex < packet.length) { | ||
| if (packet[srcIndex] == 0) { | ||
| output[lastZeroIndex] = blockStartValue; | ||
| lastZeroIndex = destIndex++; | ||
| blockStartValue = 1; | ||
| } else { | ||
| output[destIndex++] = packet[srcIndex]; | ||
| if (++blockStartValue == 255) { | ||
| output[lastZeroIndex] = blockStartValue; | ||
| lastZeroIndex = destIndex++; | ||
| blockStartValue = 1; | ||
| } | ||
| } | ||
|
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| ++srcIndex; | ||
| } | ||
|
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| output[lastZeroIndex] = blockStartValue; | ||
| return output; | ||
| } | ||
|
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| // Expected to be the entire packet to decode (must end with a 0) | ||
| public static byte[] decode(byte[] packet) { | ||
| if (packet == null | ||
| || packet.length == 0 | ||
| || packet[packet.length - 1] != 0) { | ||
| return new byte[]{}; | ||
| } | ||
|
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| byte[] output = new byte[packet.length - 2]; | ||
| int srcPacketLength = packet.length - 1; | ||
| int srcIndex = 0; | ||
| int destIndex = 0; | ||
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| while (srcIndex < srcPacketLength) { | ||
| int code = packet[srcIndex++] & 0xff; | ||
| for (int i = 1; srcIndex < srcPacketLength && i < code; ++i) { | ||
| output[destIndex++] = packet[srcIndex++]; | ||
| } | ||
| if (code != 255 && srcIndex != srcPacketLength) { | ||
| output[destIndex++] = 0; | ||
| } | ||
| } | ||
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| return output; | ||
| } | ||
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,6 +1,6 @@ | ||
| #Wed Oct 21 11:34:03 PDT 2015 | ||
| #Mon Apr 11 22:23:35 EDT 2016 | ||
| distributionBase=GRADLE_USER_HOME | ||
| distributionPath=wrapper/dists | ||
| zipStoreBase=GRADLE_USER_HOME | ||
| zipStorePath=wrapper/dists | ||
| distributionUrl=https\://services.gradle.org/distributions/gradle-2.8-all.zip | ||
| distributionUrl=https\://services.gradle.org/distributions/gradle-2.10-all.zip |