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Optimised use of buffers when decrypting to avoid unnecessary array copying

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Simeon Morgan 2013-11-12 13:31:30 +11:00
parent 546dd5485c
commit 3cc6344c8b
1 changed files with 6 additions and 0 deletions
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6
src/org/thoughtcrime/securesms/crypto/DecryptingPartInputStream.java
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@ -156,6 +156,12 @@ public class DecryptingPartInputStream extends FileInputStream {
//data retrieved using cipher.update doesn't always match cipher.getOutputSize (but should never be larger) //data retrieved using cipher.update doesn't always match cipher.getOutputSize (but should never be larger)
int outputLen = cipher.getOutputSize(read); int outputLen = cipher.getOutputSize(read);
if (outputLen < length) {
readLength += cipher.update(internalBuffer, 0, read, buffer, offset);
return readLength;
}
byte[] transientBuffer = new byte[outputLen]; byte[] transientBuffer = new byte[outputLen];
outputLen = cipher.update(internalBuffer, 0, read, transientBuffer, 0); outputLen = cipher.update(internalBuffer, 0, read, transientBuffer, 0);
if (outputLen <= length) { if (outputLen <= length) {