260 lines
9.7 KiB
Java
260 lines
9.7 KiB
Java
/* GENERATED SOURCE. DO NOT MODIFY. */
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/*
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* Copyright (C) 2015 Square, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.okhttp.okio;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.util.Arrays;
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import static com.android.okhttp.okio.Util.arrayRangeEquals;
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import static com.android.okhttp.okio.Util.checkOffsetAndCount;
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/**
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* An immutable byte string composed of segments of byte arrays. This class exists to implement
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* efficient snapshots of buffers. It is implemented as an array of segments, plus a directory in
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* two halves that describes how the segments compose this byte string.
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*
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* <p>The first half of the directory is the cumulative byte count covered by each segment. The
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* element at {@code directory[0]} contains the number of bytes held in {@code segments[0]}; the
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* element at {@code directory[1]} contains the number of bytes held in {@code segments[0] +
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* segments[1]}, and so on. The element at {@code directory[segments.length - 1]} contains the total
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* size of this byte string. The first half of the directory is always monotonically increasing.
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*
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* <p>The second half of the directory is the offset in {@code segments} of the first content byte.
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* Bytes preceding this offset are unused, as are bytes beyond the segment's effective size.
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*
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* <p>Suppose we have a byte string, {@code [A, B, C, D, E, F, G, H, I, J, K, L, M]} that is stored
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* across three byte arrays: {@code [x, x, x, x, A, B, C, D, E, x, x, x]}, {@code [x, F, G]}, and
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* {@code [H, I, J, K, L, M, x, x, x, x, x, x]}. The three byte arrays would be stored in {@code
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* segments} in order. Since the arrays contribute 5, 2, and 6 elements respectively, the directory
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* starts with {@code [5, 7, 13} to hold the cumulative total at each position. Since the offsets
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* into the arrays are 4, 1, and 0 respectively, the directory ends with {@code 4, 1, 0]}.
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* Concatenating these two halves, the complete directory is {@code [5, 7, 13, 4, 1, 0]}.
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*
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* <p>This structure is chosen so that the segment holding a particular offset can be found by
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* binary search. We use one array rather than two for the directory as a micro-optimization.
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*/
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final class SegmentedByteString extends ByteString {
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transient final byte[][] segments;
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transient final int[] directory;
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SegmentedByteString(Buffer buffer, int byteCount) {
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super(null);
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checkOffsetAndCount(buffer.size, 0, byteCount);
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// Walk through the buffer to count how many segments we'll need.
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int offset = 0;
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int segmentCount = 0;
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for (Segment s = buffer.head; offset < byteCount; s = s.next) {
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if (s.limit == s.pos) {
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throw new AssertionError("s.limit == s.pos"); // Empty segment. This should not happen!
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}
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offset += s.limit - s.pos;
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segmentCount++;
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}
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// Walk through the buffer again to assign segments and build the directory.
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this.segments = new byte[segmentCount][];
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this.directory = new int[segmentCount * 2];
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offset = 0;
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segmentCount = 0;
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for (Segment s = buffer.head; offset < byteCount; s = s.next) {
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segments[segmentCount] = s.data;
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offset += s.limit - s.pos;
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directory[segmentCount] = offset;
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directory[segmentCount + segments.length] = s.pos;
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s.shared = true;
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segmentCount++;
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}
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}
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@Override public String utf8() {
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return toByteString().utf8();
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}
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@Override public String base64() {
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return toByteString().base64();
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}
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@Override public String hex() {
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return toByteString().hex();
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}
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@Override public ByteString toAsciiLowercase() {
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return toByteString().toAsciiLowercase();
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}
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@Override public ByteString toAsciiUppercase() {
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return toByteString().toAsciiUppercase();
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}
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@Override public ByteString md5() {
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return toByteString().md5();
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}
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@Override public ByteString sha256() {
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return toByteString().sha256();
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}
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@Override public String base64Url() {
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return toByteString().base64Url();
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}
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@Override public ByteString substring(int beginIndex) {
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return toByteString().substring(beginIndex);
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}
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@Override public ByteString substring(int beginIndex, int endIndex) {
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return toByteString().substring(beginIndex, endIndex);
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}
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@Override public byte getByte(int pos) {
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checkOffsetAndCount(directory[segments.length - 1], pos, 1);
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int segment = segment(pos);
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int segmentOffset = segment == 0 ? 0 : directory[segment - 1];
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int segmentPos = directory[segment + segments.length];
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return segments[segment][pos - segmentOffset + segmentPos];
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}
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/** Returns the index of the segment that contains the byte at {@code pos}. */
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private int segment(int pos) {
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// Search for (pos + 1) instead of (pos) because the directory holds sizes, not indexes.
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int i = Arrays.binarySearch(directory, 0, segments.length, pos + 1);
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return i >= 0 ? i : ~i; // If i is negative, bitflip to get the insert position.
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}
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@Override public int size() {
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return directory[segments.length - 1];
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}
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@Override public byte[] toByteArray() {
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byte[] result = new byte[directory[segments.length - 1]];
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int segmentOffset = 0;
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for (int s = 0, segmentCount = segments.length; s < segmentCount; s++) {
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int segmentPos = directory[segmentCount + s];
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int nextSegmentOffset = directory[s];
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System.arraycopy(segments[s], segmentPos, result, segmentOffset,
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nextSegmentOffset - segmentOffset);
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segmentOffset = nextSegmentOffset;
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}
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return result;
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}
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@Override public void write(OutputStream out) throws IOException {
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if (out == null) throw new IllegalArgumentException("out == null");
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int segmentOffset = 0;
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for (int s = 0, segmentCount = segments.length; s < segmentCount; s++) {
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int segmentPos = directory[segmentCount + s];
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int nextSegmentOffset = directory[s];
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out.write(segments[s], segmentPos, nextSegmentOffset - segmentOffset);
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segmentOffset = nextSegmentOffset;
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}
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}
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@Override void write(Buffer buffer) {
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int segmentOffset = 0;
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for (int s = 0, segmentCount = segments.length; s < segmentCount; s++) {
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int segmentPos = directory[segmentCount + s];
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int nextSegmentOffset = directory[s];
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Segment segment = new Segment(segments[s], segmentPos,
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segmentPos + nextSegmentOffset - segmentOffset);
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if (buffer.head == null) {
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buffer.head = segment.next = segment.prev = segment;
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} else {
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buffer.head.prev.push(segment);
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}
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segmentOffset = nextSegmentOffset;
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}
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buffer.size += segmentOffset;
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}
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@Override public boolean rangeEquals(
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int offset, ByteString other, int otherOffset, int byteCount) {
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if (offset > size() - byteCount) return false;
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// Go segment-by-segment through this, passing arrays to other's rangeEquals().
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for (int s = segment(offset); byteCount > 0; s++) {
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int segmentOffset = s == 0 ? 0 : directory[s - 1];
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int segmentSize = directory[s] - segmentOffset;
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int stepSize = Math.min(byteCount, segmentOffset + segmentSize - offset);
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int segmentPos = directory[segments.length + s];
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int arrayOffset = offset - segmentOffset + segmentPos;
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if (!other.rangeEquals(otherOffset, segments[s], arrayOffset, stepSize)) return false;
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offset += stepSize;
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otherOffset += stepSize;
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byteCount -= stepSize;
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}
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return true;
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}
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@Override public boolean rangeEquals(int offset, byte[] other, int otherOffset, int byteCount) {
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if (offset > size() - byteCount || otherOffset > other.length - byteCount) return false;
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// Go segment-by-segment through this, comparing ranges of arrays.
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for (int s = segment(offset); byteCount > 0; s++) {
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int segmentOffset = s == 0 ? 0 : directory[s - 1];
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int segmentSize = directory[s] - segmentOffset;
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int stepSize = Math.min(byteCount, segmentOffset + segmentSize - offset);
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int segmentPos = directory[segments.length + s];
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int arrayOffset = offset - segmentOffset + segmentPos;
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if (!arrayRangeEquals(segments[s], arrayOffset, other, otherOffset, stepSize)) return false;
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offset += stepSize;
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otherOffset += stepSize;
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byteCount -= stepSize;
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}
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return true;
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}
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/** Returns a copy as a non-segmented byte string. */
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private ByteString toByteString() {
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return new ByteString(toByteArray());
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}
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@Override public boolean equals(Object o) {
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if (o == this) return true;
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return o instanceof ByteString
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&& ((ByteString) o).size() == size()
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&& rangeEquals(0, ((ByteString) o), 0, size());
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}
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@Override public int hashCode() {
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int result = hashCode;
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if (result != 0) return result;
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// Equivalent to Arrays.hashCode(toByteArray()).
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result = 1;
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int segmentOffset = 0;
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for (int s = 0, segmentCount = segments.length; s < segmentCount; s++) {
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byte[] segment = segments[s];
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int segmentPos = directory[segmentCount + s];
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int nextSegmentOffset = directory[s];
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int segmentSize = nextSegmentOffset - segmentOffset;
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for (int i = segmentPos, limit = segmentPos + segmentSize; i < limit; i++) {
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result = (31 * result) + segment[i];
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}
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segmentOffset = nextSegmentOffset;
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}
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return (hashCode = result);
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}
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@Override public String toString() {
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return toByteString().toString();
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}
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private Object writeReplace() {
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return toByteString();
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}
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}
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