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| 1 | +/* |
| 2 | + * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | + * |
| 5 | + * The Universal Permissive License (UPL), Version 1.0 |
| 6 | + * |
| 7 | + * Subject to the condition set forth below, permission is hereby granted to any |
| 8 | + * person obtaining a copy of this software, associated documentation and/or |
| 9 | + * data (collectively the "Software"), free of charge and under any and all |
| 10 | + * copyright rights in the Software, and any and all patent rights owned or |
| 11 | + * freely licensable by each licensor hereunder covering either (i) the |
| 12 | + * unmodified Software as contributed to or provided by such licensor, or (ii) |
| 13 | + * the Larger Works (as defined below), to deal in both |
| 14 | + * |
| 15 | + * (a) the Software, and |
| 16 | + * |
| 17 | + * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if |
| 18 | + * one is included with the Software each a "Larger Work" to which the Software |
| 19 | + * is contributed by such licensors), |
| 20 | + * |
| 21 | + * without restriction, including without limitation the rights to copy, create |
| 22 | + * derivative works of, display, perform, and distribute the Software and make, |
| 23 | + * use, sell, offer for sale, import, export, have made, and have sold the |
| 24 | + * Software and the Larger Work(s), and to sublicense the foregoing rights on |
| 25 | + * either these or other terms. |
| 26 | + * |
| 27 | + * This license is subject to the following condition: |
| 28 | + * |
| 29 | + * The above copyright notice and either this complete permission notice or at a |
| 30 | + * minimum a reference to the UPL must be included in all copies or substantial |
| 31 | + * portions of the Software. |
| 32 | + * |
| 33 | + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 34 | + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 35 | + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 36 | + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 37 | + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 38 | + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 39 | + * SOFTWARE. |
| 40 | + */ |
| 41 | +package com.oracle.graal.python.builtins.modules.io; |
| 42 | + |
| 43 | +import java.io.ByteArrayOutputStream; |
| 44 | +import java.util.ArrayList; |
| 45 | + |
| 46 | +import com.oracle.truffle.api.CompilerDirectives; |
| 47 | + |
| 48 | +public class BufferedIOUtil { |
| 49 | + |
| 50 | + // start of the stream (the default); offset should be zero or positive |
| 51 | + protected static final int SEEK_SET = 0; |
| 52 | + // current stream position; offset may be negative |
| 53 | + protected static final int SEEK_CUR = 1; |
| 54 | + // end of the stream; offset is usually negative |
| 55 | + protected static final int SEEK_END = 2; |
| 56 | + |
| 57 | + protected static boolean isValidWriteBuffer(PBuffered self) { |
| 58 | + return (self.isWritable() && self.getWriteEnd() != -1); |
| 59 | + } |
| 60 | + |
| 61 | + protected static int safeDowncast(PBuffered self) { |
| 62 | + return ((self.isReadable() && self.getReadEnd() != -1)) ? (self.getReadEnd() - self.getPos()) : 0; |
| 63 | + } |
| 64 | + |
| 65 | + protected static boolean isValidReadBuffer(PBuffered self) { |
| 66 | + return self.isReadable() && self.getReadEnd() != -1; |
| 67 | + } |
| 68 | + |
| 69 | + protected static int readahead(PBuffered self) { |
| 70 | + return ((self.isReadable() && isValidReadBuffer(self)) ? (self.getReadEnd() - self.getPos()) : 0); |
| 71 | + } |
| 72 | + |
| 73 | + /** |
| 74 | + * implementation of cpython/Modules/_io/bufferedio.c:RAW_OFFSET |
| 75 | + */ |
| 76 | + protected static long rawOffset(PBuffered self) { |
| 77 | + return (((isValidReadBuffer(self) || isValidWriteBuffer(self)) && self.getRawPos() >= 0) ? self.getRawPos() - self.getPos() : 0); |
| 78 | + } |
| 79 | + |
| 80 | + /** |
| 81 | + * implementation of cpython/Modules/_io/bufferedio.c:MINUS_LAST_BLOCK |
| 82 | + */ |
| 83 | + protected static int minusLastBlock(PBuffered self, int size) { |
| 84 | + return (self.getBufferMask() != 0 ? (size & ~self.getBufferMask()) : (self.getBufferSize() * (size / self.getBufferSize()))); |
| 85 | + } |
| 86 | + |
| 87 | + @CompilerDirectives.TruffleBoundary |
| 88 | + protected static ByteArrayOutputStream createStream() { |
| 89 | + return new ByteArrayOutputStream(); |
| 90 | + } |
| 91 | + |
| 92 | + @CompilerDirectives.TruffleBoundary |
| 93 | + protected static void append(ByteArrayOutputStream chunks, byte[] bytes, int off, int len) { |
| 94 | + chunks.write(bytes, off, len); |
| 95 | + } |
| 96 | + |
| 97 | + @CompilerDirectives.TruffleBoundary |
| 98 | + protected static void append(ByteArrayOutputStream chunks, byte[] bytes, int len) { |
| 99 | + append(chunks, bytes, 0, len); |
| 100 | + } |
| 101 | + |
| 102 | + @CompilerDirectives.TruffleBoundary |
| 103 | + protected static byte[] toByteArray(ByteArrayOutputStream chunks) { |
| 104 | + return chunks.toByteArray(); |
| 105 | + } |
| 106 | + |
| 107 | + protected static ArrayList<Object> createList() { |
| 108 | + return new ArrayList<>(); |
| 109 | + } |
| 110 | + |
| 111 | + protected static void append(ArrayList<Object> list, Object v) { |
| 112 | + list.add(v); |
| 113 | + } |
| 114 | + |
| 115 | + protected static Object[] asArray(ArrayList<Object> list) { |
| 116 | + return list.toArray(new Object[0]); |
| 117 | + } |
| 118 | + |
| 119 | +} |
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