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Fixed skipBits multi-byte using unaligned bit stream

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Collin Smith 2020-08-08 13:17:59 -07:00
parent e62d3ec383
commit afd7bafa12
1 changed files with 9 additions and 0 deletions
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9
core/src/com/riiablo/io/nio/BitInput.java
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@ -146,11 +146,20 @@ public class BitInput {
if (bits < 0) throw new IllegalArgumentException("bits(" + bits + ") < " + 0);
if (bits == 0) return this;
// aligns bit stream for multi-byte skipping
assert bitsCached < Byte.SIZE : "bitsCached(" + bitsCached + ") > " + (Byte.SIZE - 1);
if (bits >= bitsCached) {
bits -= bitsCached;
align();
}
// skips multiple bytes
final long startingBitsRead = bitsRead;
final long bytes = bits / Byte.SIZE;
assert bytes <= Integer.MAX_VALUE : "bytes(" + bytes + ") > Integer.MAX_VALUE";
if (bytes > 0) align().skipBytes((int) bytes);
// skips overflow bits
final long overflowBits = (startingBitsRead + bits) - bitsRead;
// checks single byte, multi-byte and expected max value
assert bytes != 0 || overflowBits < Byte.SIZE : "overflowBits(" + overflowBits + ") > " + (Byte.SIZE - 1);