| /* |
| * 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 "PushbackInputStream.h" |
| |
| #include <decaf/lang/System.h> |
| |
| using namespace decaf; |
| using namespace decaf::io; |
| using namespace decaf::lang; |
| using namespace decaf::lang::exceptions; |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| PushbackInputStream::PushbackInputStream(InputStream* stream, bool own) : |
| FilterInputStream(stream, own), buffer(new unsigned char[1]), bufferSize(1), pos(1) { |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| PushbackInputStream::PushbackInputStream(InputStream* stream, int bufSize, bool own) : |
| FilterInputStream(stream, own), buffer(NULL), bufferSize(bufSize), pos(bufSize) { |
| |
| if (bufSize < 0) { |
| throw IllegalArgumentException(__FILE__, __LINE__, "Size of Push Back buffer cannot be negative."); |
| } |
| |
| this->buffer = new unsigned char[bufSize]; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| PushbackInputStream::~PushbackInputStream() { |
| try { |
| close(); |
| } |
| DECAF_CATCHALL_NOTHROW() |
| |
| try { |
| delete[] this->buffer; |
| } |
| DECAF_CATCHALL_NOTHROW() |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int PushbackInputStream::available() const { |
| try { |
| return (this->bufferSize - this->pos) + inputStream->available(); |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| long long PushbackInputStream::skip(long long num) { |
| |
| if (num <= 0) { |
| return 0; |
| } |
| |
| if (isClosed()) { |
| throw IOException(__FILE__, __LINE__, "Stream is closed"); |
| } |
| |
| try { |
| |
| long long unread = bufferSize - pos; |
| long long numSkipped = 0; |
| |
| if (unread != 0) { |
| numSkipped += (num < unread) ? num : unread; |
| pos += (int) numSkipped; |
| } |
| |
| if (numSkipped < num) { |
| numSkipped += inputStream->skip(num - numSkipped); |
| } |
| |
| return numSkipped; |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void PushbackInputStream::mark(int readLimit DECAF_UNUSED) { |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void PushbackInputStream::reset() { |
| throw IOException(__FILE__, __LINE__, "Reset is not Supported by the PushbackInputStream."); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void PushbackInputStream::unread(unsigned char value) { |
| |
| if (pos == 0) { |
| throw IOException(__FILE__, __LINE__, "No Space left in the unread buffer."); |
| } |
| |
| try { |
| buffer[--pos] = value; |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void PushbackInputStream::unread(const unsigned char* buffer, int size) { |
| |
| if (size < 0) { |
| throw IndexOutOfBoundsException(__FILE__, __LINE__, "Given size of the buffer was negatiev."); |
| } |
| |
| try { |
| this->unread(buffer, size, 0, size); |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCH_RETHROW(NullPointerException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| void PushbackInputStream::unread(const unsigned char* buffer, int size, int offset, int length) { |
| |
| if (length > pos) { |
| throw IOException(__FILE__, __LINE__, "No Space left in the unread buffer."); |
| } |
| |
| if (size < 0) { |
| throw IndexOutOfBoundsException(__FILE__, __LINE__, "size parameter out of Bounds: %d.", size); |
| } |
| |
| if (offset > size || offset < 0) { |
| throw IndexOutOfBoundsException(__FILE__, __LINE__, "offset parameter out of Bounds: %d.", offset); |
| } |
| |
| if (length < 0 || length > size - offset) { |
| throw IndexOutOfBoundsException(__FILE__, __LINE__, "length parameter out of Bounds: %d.", length); |
| } |
| |
| if (buffer == NULL) { |
| throw NullPointerException(__FILE__, __LINE__, "Buffer pointer passed was NULL."); |
| } |
| |
| try { |
| System::arraycopy(buffer, offset, this->buffer, pos - length, length); |
| pos = pos - length; |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCH_RETHROW(IndexOutOfBoundsException) |
| DECAF_CATCH_RETHROW(NullPointerException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int PushbackInputStream::doReadByte() { |
| |
| if (isClosed()) { |
| throw IOException(__FILE__, __LINE__, "Stream is closed"); |
| } |
| |
| try { |
| if (pos < bufferSize) { |
| return buffer[pos++]; |
| } |
| |
| return inputStream->read(); |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| int PushbackInputStream::doReadArrayBounded(unsigned char* buffer, int size, int offset, int length) { |
| |
| if (isClosed()) { |
| throw IOException(__FILE__, __LINE__, "Stream is closed"); |
| } |
| |
| if (buffer == NULL) { |
| throw NullPointerException(__FILE__, __LINE__, "Buffer pointer passed was NULL."); |
| } |
| |
| if (size < 0) { |
| throw IndexOutOfBoundsException(__FILE__, __LINE__, "size parameter out of Bounds: %d.", size); |
| } |
| |
| if (offset > size || offset < 0) { |
| throw IndexOutOfBoundsException(__FILE__, __LINE__, "offset parameter out of Bounds: %d.", offset); |
| } |
| |
| if (length < 0 || length > size - offset) { |
| throw IndexOutOfBoundsException(__FILE__, __LINE__, "length parameter out of Bounds: %d.", length); |
| } |
| |
| try { |
| int copiedBytes = 0; |
| int copyLength = 0; |
| int newOffset = offset; |
| |
| // Are there pushback bytes available? |
| if (pos < bufferSize) { |
| copyLength = (bufferSize - pos >= length) ? length : bufferSize - pos; |
| System::arraycopy(this->buffer, pos, buffer, newOffset, copyLength); |
| newOffset += copyLength; |
| copiedBytes += copyLength; |
| // Use up the bytes in the local buffer |
| pos += copyLength; |
| } |
| |
| // Have we copied enough? |
| if (copyLength == length) { |
| return length; |
| } |
| |
| int inCopied = inputStream->read(buffer, size, newOffset, length - copiedBytes); |
| if (inCopied > 0) { |
| return inCopied + copiedBytes; |
| } |
| |
| if (copiedBytes == 0) { |
| return inCopied; |
| } |
| |
| return copiedBytes; |
| } |
| DECAF_CATCH_RETHROW(IOException) |
| DECAF_CATCH_RETHROW(IndexOutOfBoundsException) |
| DECAF_CATCH_RETHROW(NullPointerException) |
| DECAF_CATCHALL_THROW(IOException) |
| } |