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/*
* Copyright (C) 2014 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.prestosql.jdbc.$internal.okio;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import io.prestosql.jdbc.$internal.javax.annotation.Nullable;
import static io.prestosql.jdbc.$internal.okio.Util.checkOffsetAndCount;
final class RealBufferedSource implements BufferedSource {
public final Buffer buffer = new Buffer();
public final Source source;
boolean closed;
RealBufferedSource(Source source) {
if (source == null) throw new NullPointerException("source == null");
this.source = source;
}
@Override public Buffer buffer() {
return buffer;
}
@Override public long read(Buffer sink, long byteCount) throws IOException {
if (sink == null) throw new IllegalArgumentException("sink == null");
if (byteCount < 0) throw new IllegalArgumentException("byteCount < 0: " + byteCount);
if (closed) throw new IllegalStateException("closed");
if (buffer.size == 0) {
long read = source.read(buffer, Segment.SIZE);
if (read == -1) return -1;
}
long toRead = Math.min(byteCount, buffer.size);
return buffer.read(sink, toRead);
}
@Override public boolean exhausted() throws IOException {
if (closed) throw new IllegalStateException("closed");
return buffer.exhausted() && source.read(buffer, Segment.SIZE) == -1;
}
@Override public void require(long byteCount) throws IOException {
if (!request(byteCount)) throw new EOFException();
}
@Override public boolean request(long byteCount) throws IOException {
if (byteCount < 0) throw new IllegalArgumentException("byteCount < 0: " + byteCount);
if (closed) throw new IllegalStateException("closed");
while (buffer.size < byteCount) {
if (source.read(buffer, Segment.SIZE) == -1) return false;
}
return true;
}
@Override public byte readByte() throws IOException {
require(1);
return buffer.readByte();
}
@Override public ByteString readByteString() throws IOException {
buffer.writeAll(source);
return buffer.readByteString();
}
@Override public ByteString readByteString(long byteCount) throws IOException {
require(byteCount);
return buffer.readByteString(byteCount);
}
@Override public int select(Options options) throws IOException {
if (closed) throw new IllegalStateException("closed");
while (true) {
int index = buffer.selectPrefix(options);
if (index == -1) return -1;
// If the prefix match actually matched a full byte string, consume it and return it.
int selectedSize = options.byteStrings[index].size();
if (selectedSize <= buffer.size) {
buffer.skip(selectedSize);
return index;
}
// We need to grow the buffer. Do that, then try it all again.
if (source.read(buffer, Segment.SIZE) == -1) return -1;
}
}
@Override public byte[] readByteArray() throws IOException {
buffer.writeAll(source);
return buffer.readByteArray();
}
@Override public byte[] readByteArray(long byteCount) throws IOException {
require(byteCount);
return buffer.readByteArray(byteCount);
}
@Override public int read(byte[] sink) throws IOException {
return read(sink, 0, sink.length);
}
@Override public void readFully(byte[] sink) throws IOException {
try {
require(sink.length);
} catch (EOFException e) {
// The underlying source is exhausted. Copy the bytes we got before rethrowing.
int offset = 0;
while (buffer.size > 0) {
int read = buffer.read(sink, offset, (int) buffer.size);
if (read == -1) throw new AssertionError();
offset += read;
}
throw e;
}
buffer.readFully(sink);
}
@Override public int read(byte[] sink, int offset, int byteCount) throws IOException {
checkOffsetAndCount(sink.length, offset, byteCount);
if (buffer.size == 0) {
long read = source.read(buffer, Segment.SIZE);
if (read == -1) return -1;
}
int toRead = (int) Math.min(byteCount, buffer.size);
return buffer.read(sink, offset, toRead);
}
@Override public void readFully(Buffer sink, long byteCount) throws IOException {
try {
require(byteCount);
} catch (EOFException e) {
// The underlying source is exhausted. Copy the bytes we got before rethrowing.
sink.writeAll(buffer);
throw e;
}
buffer.readFully(sink, byteCount);
}
@Override public long readAll(Sink sink) throws IOException {
if (sink == null) throw new IllegalArgumentException("sink == null");
long totalBytesWritten = 0;
while (source.read(buffer, Segment.SIZE) != -1) {
long emitByteCount = buffer.completeSegmentByteCount();
if (emitByteCount > 0) {
totalBytesWritten += emitByteCount;
sink.write(buffer, emitByteCount);
}
}
if (buffer.size() > 0) {
totalBytesWritten += buffer.size();
sink.write(buffer, buffer.size());
}
return totalBytesWritten;
}
@Override public String readUtf8() throws IOException {
buffer.writeAll(source);
return buffer.readUtf8();
}
@Override public String readUtf8(long byteCount) throws IOException {
require(byteCount);
return buffer.readUtf8(byteCount);
}
@Override public String readString(Charset charset) throws IOException {
if (charset == null) throw new IllegalArgumentException("charset == null");
buffer.writeAll(source);
return buffer.readString(charset);
}
@Override public String readString(long byteCount, Charset charset) throws IOException {
require(byteCount);
if (charset == null) throw new IllegalArgumentException("charset == null");
return buffer.readString(byteCount, charset);
}
@Override public @Nullable String readUtf8Line() throws IOException {
long newline = indexOf((byte) '\n');
if (newline == -1) {
return buffer.size != 0 ? readUtf8(buffer.size) : null;
}
return buffer.readUtf8Line(newline);
}
@Override public String readUtf8LineStrict() throws IOException {
return readUtf8LineStrict(Long.MAX_VALUE);
}
@Override public String readUtf8LineStrict(long limit) throws IOException {
if (limit < 0) throw new IllegalArgumentException("limit < 0: " + limit);
long scanLength = limit == Long.MAX_VALUE ? Long.MAX_VALUE : limit + 1;
long newline = indexOf((byte) '\n', 0, scanLength);
if (newline != -1) return buffer.readUtf8Line(newline);
if (scanLength < Long.MAX_VALUE
&& request(scanLength) && buffer.getByte(scanLength - 1) == '\r'
&& request(scanLength + 1) && buffer.getByte(scanLength) == '\n') {
return buffer.readUtf8Line(scanLength); // The line was 'limit' UTF-8 bytes followed by \r\n.
}
Buffer data = new Buffer();
buffer.copyTo(data, 0, Math.min(32, buffer.size()));
throw new EOFException("\\n not found: limit=" + Math.min(buffer.size(), limit)
+ " content=" + data.readByteString().hex() + '…');
}
@Override public int readUtf8CodePoint() throws IOException {
require(1);
byte b0 = buffer.getByte(0);
if ((b0 & 0xe0) == 0xc0) {
require(2);
} else if ((b0 & 0xf0) == 0xe0) {
require(3);
} else if ((b0 & 0xf8) == 0xf0) {
require(4);
}
return buffer.readUtf8CodePoint();
}
@Override public short readShort() throws IOException {
require(2);
return buffer.readShort();
}
@Override public short readShortLe() throws IOException {
require(2);
return buffer.readShortLe();
}
@Override public int readInt() throws IOException {
require(4);
return buffer.readInt();
}
@Override public int readIntLe() throws IOException {
require(4);
return buffer.readIntLe();
}
@Override public long readLong() throws IOException {
require(8);
return buffer.readLong();
}
@Override public long readLongLe() throws IOException {
require(8);
return buffer.readLongLe();
}
@Override public long readDecimalLong() throws IOException {
require(1);
for (int pos = 0; request(pos + 1); pos++) {
byte b = buffer.getByte(pos);
if ((b < '0' || b > '9') && (pos != 0 || b != '-')) {
// Non-digit, or non-leading negative sign.
if (pos == 0) {
throw new NumberFormatException(String.format(
"Expected leading [0-9] or '-' character but was %#x", b));
}
break;
}
}
return buffer.readDecimalLong();
}
@Override public long readHexadecimalUnsignedLong() throws IOException {
require(1);
for (int pos = 0; request(pos + 1); pos++) {
byte b = buffer.getByte(pos);
if ((b < '0' || b > '9') && (b < 'a' || b > 'f') && (b < 'A' || b > 'F')) {
// Non-digit, or non-leading negative sign.
if (pos == 0) {
throw new NumberFormatException(String.format(
"Expected leading [0-9a-fA-F] character but was %#x", b));
}
break;
}
}
return buffer.readHexadecimalUnsignedLong();
}
@Override public void skip(long byteCount) throws IOException {
if (closed) throw new IllegalStateException("closed");
while (byteCount > 0) {
if (buffer.size == 0 && source.read(buffer, Segment.SIZE) == -1) {
throw new EOFException();
}
long toSkip = Math.min(byteCount, buffer.size());
buffer.skip(toSkip);
byteCount -= toSkip;
}
}
@Override public long indexOf(byte b) throws IOException {
return indexOf(b, 0, Long.MAX_VALUE);
}
@Override public long indexOf(byte b, long fromIndex) throws IOException {
return indexOf(b, fromIndex, Long.MAX_VALUE);
}
@Override public long indexOf(byte b, long fromIndex, long toIndex) throws IOException {
if (closed) throw new IllegalStateException("closed");
if (fromIndex < 0 || toIndex < fromIndex) {
throw new IllegalArgumentException(
String.format("fromIndex=%s toIndex=%s", fromIndex, toIndex));
}
while (fromIndex < toIndex) {
long result = buffer.indexOf(b, fromIndex, toIndex);
if (result != -1L) return result;
// The byte wasn't in the buffer. Give up if we've already reached our target size or if the
// underlying stream is exhausted.
long lastBufferSize = buffer.size;
if (lastBufferSize >= toIndex || source.read(buffer, Segment.SIZE) == -1) return -1L;
// Continue the search from where we left off.
fromIndex = Math.max(fromIndex, lastBufferSize);
}
return -1L;
}
@Override public long indexOf(ByteString bytes) throws IOException {
return indexOf(bytes, 0);
}
@Override public long indexOf(ByteString bytes, long fromIndex) throws IOException {
if (closed) throw new IllegalStateException("closed");
while (true) {
long result = buffer.indexOf(bytes, fromIndex);
if (result != -1) return result;
long lastBufferSize = buffer.size;
if (source.read(buffer, Segment.SIZE) == -1) return -1L;
// Keep searching, picking up from where we left off.
fromIndex = Math.max(fromIndex, lastBufferSize - bytes.size() + 1);
}
}
@Override public long indexOfElement(ByteString targetBytes) throws IOException {
return indexOfElement(targetBytes, 0);
}
@Override public long indexOfElement(ByteString targetBytes, long fromIndex) throws IOException {
if (closed) throw new IllegalStateException("closed");
while (true) {
long result = buffer.indexOfElement(targetBytes, fromIndex);
if (result != -1) return result;
long lastBufferSize = buffer.size;
if (source.read(buffer, Segment.SIZE) == -1) return -1L;
// Keep searching, picking up from where we left off.
fromIndex = Math.max(fromIndex, lastBufferSize);
}
}
@Override public boolean rangeEquals(long offset, ByteString bytes) throws IOException {
return rangeEquals(offset, bytes, 0, bytes.size());
}
@Override
public boolean rangeEquals(long offset, ByteString bytes, int bytesOffset, int byteCount)
throws IOException {
if (closed) throw new IllegalStateException("closed");
if (offset < 0
|| bytesOffset < 0
|| byteCount < 0
|| bytes.size() - bytesOffset < byteCount) {
return false;
}
for (int i = 0; i < byteCount; i++) {
long bufferOffset = offset + i;
if (!request(bufferOffset + 1)) return false;
if (buffer.getByte(bufferOffset) != bytes.getByte(bytesOffset + i)) return false;
}
return true;
}
@Override public InputStream inputStream() {
return new InputStream() {
@Override public int read() throws IOException {
if (closed) throw new IOException("closed");
if (buffer.size == 0) {
long count = source.read(buffer, Segment.SIZE);
if (count == -1) return -1;
}
return buffer.readByte() & 0xff;
}
@Override public int read(byte[] data, int offset, int byteCount) throws IOException {
if (closed) throw new IOException("closed");
checkOffsetAndCount(data.length, offset, byteCount);
if (buffer.size == 0) {
long count = source.read(buffer, Segment.SIZE);
if (count == -1) return -1;
}
return buffer.read(data, offset, byteCount);
}
@Override public int available() throws IOException {
if (closed) throw new IOException("closed");
return (int) Math.min(buffer.size, Integer.MAX_VALUE);
}
@Override public void close() throws IOException {
RealBufferedSource.this.close();
}
@Override public String toString() {
return RealBufferedSource.this + ".inputStream()";
}
};
}
@Override public void close() throws IOException {
if (closed) return;
closed = true;
source.close();
buffer.clear();
}
@Override public Timeout timeout() {
return source.timeout();
}
@Override public String toString() {
return "buffer(" + source + ")";
}
}
