Mercurial > jhg
changeset 599:55b7987c1796
Do not instantiate intermediate arrays
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
---|---|
date | Fri, 03 May 2013 15:29:26 +0200 (2013-05-03) |
parents | d29d9dc6c128 |
children | 46f29b73e51e |
files | src/org/tmatesoft/hg/internal/ByteArrayDataAccess.java |
diffstat | 1 files changed, 24 insertions(+), 1 deletions(-) [+] |
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--- a/src/org/tmatesoft/hg/internal/ByteArrayDataAccess.java Fri May 03 15:19:18 2013 +0200 +++ b/src/org/tmatesoft/hg/internal/ByteArrayDataAccess.java Fri May 03 15:29:26 2013 +0200 @@ -54,9 +54,32 @@ if (len > (this.length - pos)) { throw new IOException(); } - System.arraycopy(data, pos, buf, off, len); + System.arraycopy(data, offset+pos, buf, off, len); pos += len; } + @Override + public int readInt() throws IOException { + // overridden not to create an intermediate array + if (length - pos < 4) { + throw new IOException(); + } + int x = offset + pos; + int rv = data[x++] << 24 | (data[x++] & 0xFF) << 16 | (data[x++] & 0xFF) << 8 | (data[x] & 0xFF); + pos += 4; + return rv; + } + @Override + public long readLong() throws IOException { + // overridden not to create an intermediate array + if (length - pos < 8) { + throw new IOException(); + } + int x = offset + pos; + int i1 = data[x++] << 24 | (data[x++] & 0xFF) << 16 | (data[x++] & 0xFF) << 8 | (data[x++] & 0xFF); + int i2 = data[x++] << 24 | (data[x++] & 0xFF) << 16 | (data[x++] & 0xFF) << 8 | (data[x] & 0xFF); + pos += 8; + return ((long) i1) << 32 | ((long) i2 & 0x0FFFFFFFFl); + } @Override public ByteArrayDataAccess reset() {