| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| #include "InputStream.h" |
| |
| #include <typeinfo> |
| |
| #include <decaf/lang/exceptions/NullPointerException.h> |
| |
| using namespace decaf; |
| using namespace decaf::io; |
| using namespace decaf::lang; |
| using namespace decaf::lang::exceptions; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| InputStream::InputStream() : mutex() { |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| InputStream::~InputStream() { |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void InputStream::close() { |
| |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void InputStream::mark(int readLimit DECAF_UNUSED) { |
| |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| std::string InputStream::toString() const { |
| return typeid(this).name(); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void InputStream::reset() { |
| throw IOException(__FILE__, __LINE__, "Base InputStream class does not support Reset."); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int InputStream::read() { |
| try { |
| return this->doReadByte(); |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int InputStream::read(unsigned char* buffer, int size) { |
| |
| try { |
| return this->doReadArray(buffer, size); |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCH_RETHROW(NullPointerException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int InputStream::read(unsigned char* buffer, int size, int offset, int length) { |
| |
| try { |
| return this->doReadArrayBounded(buffer, size, offset, length); |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCH_RETHROW(IndexOutOfBoundsException) |
| DECAF_CATCH_RETHROW(NullPointerException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| long long InputStream::skip(long long num) { |
| |
| try { |
| |
| if (num <= 0) { |
| return 0; |
| } |
| |
| long long skipped = 0; |
| |
| // Lets not try and buffer every byte since it could be as large as |
| // whatever size_t is on this platform, read the data in reasonable |
| // chunks until finished. |
| int toRead = num < 4096LL ? (int) num : 4096; |
| std::vector<unsigned char> buffer(toRead); |
| |
| while (skipped < num) { |
| |
| int read = doReadArrayBounded(&buffer[0], (int) buffer.size(), 0, toRead); |
| |
| // Is it EOF? |
| if (read == -1) { |
| return skipped; |
| } |
| |
| skipped += read; |
| |
| if (read < toRead) { |
| return skipped; |
| } |
| if (num - skipped < toRead) { |
| toRead = (int) (num - skipped); |
| } |
| } |
| return skipped; |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCH_RETHROW(UnsupportedOperationException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int InputStream::doReadArray(unsigned char* buffer, int size) { |
| |
| try { |
| return this->doReadArrayBounded(buffer, size, 0, size); |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCH_RETHROW(NullPointerException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int InputStream::doReadArrayBounded(unsigned char* buffer, int size, int offset, int length) { |
| |
| try { |
| |
| if (length == 0) { |
| return 0; |
| } |
| |
| if (buffer == NULL) { |
| throw NullPointerException(__FILE__, __LINE__, "Buffer passed was NULL"); |
| } |
| |
| if (length > (size - offset)) { |
| throw IndexOutOfBoundsException(__FILE__, __LINE__, "Offset + Length given exceeds Buffer size."); |
| } |
| |
| for (int i = 0; i < length; i++) { |
| |
| int c; |
| try { |
| if ((c = doReadByte()) == -1) { |
| return i == 0 ? -1 : (int) i; |
| } |
| } catch (IOException& e) { |
| if (i != 0) { |
| return (int) i; |
| } |
| throw e; |
| } |
| buffer[offset + i] = (unsigned char) c; |
| } |
| |
| return (int) length; |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCH_RETHROW(IndexOutOfBoundsException) |
| DECAF_CATCH_RETHROW(NullPointerException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |