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minor optimizations in ByteArrayInput

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git-svn-id: https://smali.googlecode.com/svn/trunk@686 55b6fa8a-2a1e-11de-a435-ffa8d773f76a
This commit is contained in:
JesusFreke@JesusFreke.com 2010-04-03 23:02:08 +00:00
parent 1f29ee7351
commit bba8645009
1 changed files with 23 additions and 61 deletions
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84
dexlib/src/main/java/org/jf/dexlib/Util/ByteArrayInput.java
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@ -78,66 +78,43 @@ public class ByteArrayInput
/** {@inheritDoc} */ /** {@inheritDoc} */
public byte readByte() { public byte readByte() {
int readAt = cursor; return data[cursor++];
int end = readAt + 1;
if (end > data.length) {
throwBounds();
}
cursor = end;
return data[readAt];
} }
/** {@inheritDoc} */ /** {@inheritDoc} */
public int readShort() { public int readShort() {
int readAt = cursor; int readAt = cursor;
int end = readAt + 2; int result = ((data[readAt++] & 0xff) +
((data[readAt++] & 0xff) << 8));
if (end > data.length) { cursor = readAt;
throwBounds(); return result;
}
cursor = end;
return ((data[readAt] & 0xff) +
((data[readAt + 1] & 0xff) << 8));
} }
/** {@inheritDoc} */ /** {@inheritDoc} */
public int readInt() { public int readInt() {
int readAt = cursor; int readAt = cursor;
int end = readAt + 4; int result = (data[readAt++] & 0xff) +
((data[readAt++] & 0xff) << 8) +
if (end > data.length) { ((data[readAt++] & 0xff) << 16) +
throwBounds(); ((data[readAt++] & 0xff) << 24);
} cursor = readAt;
return result;
cursor = end;
return (data[readAt] & 0xff) +
((data[readAt + 1] & 0xff) << 8) +
((data[readAt + 2] & 0xff) << 16) +
((data[readAt + 3] & 0xff) << 24);
} }
/** {@inheritDoc} */ /** {@inheritDoc} */
public long readLong() { public long readLong() {
int readAt = cursor; int readAt = cursor;
int end = readAt + 8;
if (end > data.length) { long result = (data[readAt++] & 0xffL) |
throwBounds(); ((data[readAt++] & 0xffL) << 8) |
} ((data[readAt++] & 0xffL) << 16) |
((data[readAt++] & 0xffL) << 24) |
cursor = end; ((data[readAt++] & 0xffL) << 32) |
((data[readAt++] & 0xffL) << 40) |
return (data[readAt] & 0xffL) | ((data[readAt++] & 0xffL) << 48) |
((data[readAt + 1] & 0xffL) << 8) | ((data[readAt++] & 0xffL) << 58);
((data[readAt + 2] & 0xffL) << 16) | cursor = readAt;
((data[readAt + 3] & 0xffL) << 24) | return result;
((data[readAt + 4] & 0xffL) << 32) |
((data[readAt + 5] & 0xffL) << 40) |
((data[readAt + 6] & 0xffL) << 48) |
((data[readAt + 7] & 0xffL) << 58);
} }
@ -300,9 +277,6 @@ public class ByteArrayInput
int startPosition = cursor; int startPosition = cursor;
while (data[cursor] != 0) { while (data[cursor] != 0) {
cursor++; cursor++;
if (cursor >= data.length) {
throwBounds();
}
} }
int byteCount = cursor - startPosition; int byteCount = cursor - startPosition;
@ -314,24 +288,12 @@ public class ByteArrayInput
/** {@inheritDoc} */ /** {@inheritDoc} */
public void skipBytes(int count) { public void skipBytes(int count) {
int end = cursor + count; cursor += count;
if (end > data.length) {
throwBounds();
}
cursor = end;
} }
/** {@inheritDoc} */ /** {@inheritDoc} */
public void alignTo(int alignment) { public void alignTo(int alignment) {
int end = AlignmentUtils.alignOffset(cursor, alignment); cursor = AlignmentUtils.alignOffset(cursor, alignment);
if (end > data.length) {
throwBounds();
}
cursor = end;
} }
/** /**