mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-15 14:18:37 +00:00
65b5d31814
svn-id: r40725
683 lines
19 KiB
C++
683 lines
19 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#ifndef COMMON_STREAM_H
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#define COMMON_STREAM_H
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#include "common/scummsys.h"
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namespace Common {
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class String;
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class MemoryReadStream;
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/**
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* Virtual base class for both ReadStream and WriteStream.
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*/
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class Stream {
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public:
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virtual ~Stream() {}
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/**
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* Returns true if an I/O failure occurred.
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* This flag is never cleared automatically. In order to clear it,
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* client code has to call clearErr() explicitly.
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*/
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virtual bool err() const { return false; }
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/**
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* Reset the I/O error status as returned by err().
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* For a ReadStream, also reset the end-of-stream status returned by eos().
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*/
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virtual void clearErr() {}
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};
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/**
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* Generic interface for a writable data stream.
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*/
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class WriteStream : virtual public Stream {
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public:
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/**
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* Write data into the stream. Subclasses must implement this
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* method; all other write methods are implemented using it.
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*
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* @param dataPtr pointer to the data to be written
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* @param dataSize number of bytes to be written
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* @return the number of bytes which were actually written.
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*/
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virtual uint32 write(const void *dataPtr, uint32 dataSize) = 0;
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/**
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* Commit any buffered data to the underlying channel or
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* storage medium; unbuffered streams can use the default
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* implementation.
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*
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* @return true on success, false in case of a failure
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*/
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virtual bool flush() { return true; }
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/**
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* Finalize and close this stream. To be called right before this
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* stream instance is deleted. The goal here is to enable calling
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* code to detect and handle I/O errors which might occur when
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* closing (and this flushing, if buffered) the stream.
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*
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* After this method has been called, no further writes may be
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* performed on the stream. Calling err() is allowed.
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*
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* By default, this just flushes the stream.
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*/
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virtual void finalize() {
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flush();
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}
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// The remaining methods all have default implementations; subclasses
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// need not (and should not) overload them.
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void writeByte(byte value) {
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write(&value, 1);
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}
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void writeSByte(int8 value) {
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write(&value, 1);
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}
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void writeUint16LE(uint16 value) {
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writeByte((byte)(value & 0xff));
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writeByte((byte)(value >> 8));
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}
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void writeUint32LE(uint32 value) {
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writeUint16LE((uint16)(value & 0xffff));
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writeUint16LE((uint16)(value >> 16));
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}
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void writeUint16BE(uint16 value) {
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writeByte((byte)(value >> 8));
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writeByte((byte)(value & 0xff));
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}
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void writeUint32BE(uint32 value) {
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writeUint16BE((uint16)(value >> 16));
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writeUint16BE((uint16)(value & 0xffff));
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}
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void writeSint16LE(int16 value) {
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writeUint16LE((uint16)value);
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}
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void writeSint32LE(int32 value) {
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writeUint32LE((uint32)value);
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}
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void writeSint16BE(int16 value) {
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writeUint16BE((uint16)value);
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}
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void writeSint32BE(int32 value) {
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writeUint32BE((uint32)value);
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}
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/**
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* Write the given string to the stream.
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* This writes str.size() characters, but no terminating zero byte.
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*/
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void writeString(const String &str);
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};
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/**
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* Generic interface for a readable data stream.
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*/
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class ReadStream : virtual public Stream {
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public:
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/**
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* Returns true if a read failed because the stream has been reached.
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* This flag is cleared by clearErr().
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* For a SeekableReadStream, it is also cleared by a successful seek.
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*/
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virtual bool eos() const = 0;
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/**
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* Read data from the stream. Subclasses must implement this
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* method; all other read methods are implemented using it.
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*
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* @param dataPtr pointer to a buffer into which the data is read
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* @param dataSize number of bytes to be read
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* @return the number of bytes which were actually read.
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*/
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virtual uint32 read(void *dataPtr, uint32 dataSize) = 0;
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// The remaining methods all have default implementations; subclasses
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// in general should not overload them.
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/**
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* DEPRECATED
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* Default implementation for backward compatibility
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*/
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virtual bool ioFailed() { return (eos() || err()); }
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/**
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* Read an unsigned byte from the stream and return it.
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* Performs no error checking. The return value is undefined
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* if a read error occurred (for which client code can check by
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* calling err() and eos() ).
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*/
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byte readByte() {
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byte b = 0;
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read(&b, 1);
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return b;
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}
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/**
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* Read a signed byte from the stream and return it.
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* Performs no error checking. The return value is undefined
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* if a read error occurred (for which client code can check by
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* calling err() and eos() ).
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*/
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int8 readSByte() {
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int8 b = 0;
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read(&b, 1);
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return b;
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}
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/**
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* Read an unsigned 16-bit word stored in little endian (LSB first) order
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* from the stream and return it.
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* Performs no error checking. The return value is undefined
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* if a read error occurred (for which client code can check by
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* calling err() and eos() ).
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*/
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uint16 readUint16LE() {
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uint16 a = readByte();
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uint16 b = readByte();
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return a | (b << 8);
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}
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/**
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* Read an unsigned 32-bit word stored in little endian (LSB first) order
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* from the stream and return it.
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* Performs no error checking. The return value is undefined
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* if a read error occurred (for which client code can check by
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* calling err() and eos() ).
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*/
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uint32 readUint32LE() {
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uint32 a = readUint16LE();
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uint32 b = readUint16LE();
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return (b << 16) | a;
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}
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/**
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* Read an unsigned 16-bit word stored in big endian (MSB first) order
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* from the stream and return it.
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* Performs no error checking. The return value is undefined
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* if a read error occurred (for which client code can check by
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* calling err() and eos() ).
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*/
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uint16 readUint16BE() {
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uint16 b = readByte();
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uint16 a = readByte();
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return a | (b << 8);
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}
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/**
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* Read an unsigned 32-bit word stored in big endian (MSB first) order
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* from the stream and return it.
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* Performs no error checking. The return value is undefined
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* if a read error occurred (for which client code can check by
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* calling err() and eos() ).
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*/
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uint32 readUint32BE() {
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uint32 b = readUint16BE();
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uint32 a = readUint16BE();
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return (b << 16) | a;
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}
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/**
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* Read a signed 16-bit word stored in little endian (LSB first) order
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* from the stream and return it.
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* Performs no error checking. The return value is undefined
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* if a read error occurred (for which client code can check by
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* calling err() and eos() ).
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*/
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int16 readSint16LE() {
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return (int16)readUint16LE();
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}
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/**
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* Read a signed 32-bit word stored in little endian (LSB first) order
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* from the stream and return it.
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* Performs no error checking. The return value is undefined
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* if a read error occurred (for which client code can check by
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* calling err() and eos() ).
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*/
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int32 readSint32LE() {
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return (int32)readUint32LE();
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}
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/**
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* Read a signed 16-bit word stored in big endian (MSB first) order
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* from the stream and return it.
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* Performs no error checking. The return value is undefined
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* if a read error occurred (for which client code can check by
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* calling err() and eos() ).
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*/
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int16 readSint16BE() {
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return (int16)readUint16BE();
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}
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/**
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* Read a signed 32-bit word stored in big endian (MSB first) order
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* from the stream and return it.
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* Performs no error checking. The return value is undefined
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* if a read error occurred (for which client code can check by
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* calling err() and eos() ).
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*/
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int32 readSint32BE() {
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return (int32)readUint32BE();
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}
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/**
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* Read the specified amount of data into a malloc'ed buffer
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* which then is wrapped into a MemoryReadStream.
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* The returned stream might contain less data than requested,
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* if reading more failed, because of an I/O error or because
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* the end of the stream was reached. Which can be determined by
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* calling err() and eos().
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*/
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MemoryReadStream *readStream(uint32 dataSize);
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};
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/**
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* Interface for a seekable & readable data stream.
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*
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* @todo Get rid of SEEK_SET, SEEK_CUR, or SEEK_END, use our own constants
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*/
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class SeekableReadStream : virtual public ReadStream {
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public:
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/**
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* Obtains the current value of the stream position indicator of the
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* stream.
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*
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* @return the current position indicator, or -1 if an error occurred.
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*/
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virtual int32 pos() const = 0;
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/**
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* Obtains the total size of the stream, measured in bytes.
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* If this value is unknown or can not be computed, -1 is returned.
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*
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* @return the size of the stream, or -1 if an error occurred
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*/
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virtual int32 size() const = 0;
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/**
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* Sets the stream position indicator for the stream. The new position,
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* measured in bytes, is obtained by adding offset bytes to the position
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* specified by whence. If whence is set to SEEK_SET, SEEK_CUR, or
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* SEEK_END, the offset is relative to the start of the file, the current
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* position indicator, or end-of-file, respectively. A successful call
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* to the seek() method clears the end-of-file indicator for the stream.
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*
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* @param offset the relative offset in bytes
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* @param whence the seek reference: SEEK_SET, SEEK_CUR, or SEEK_END
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* @return true on success, false in case of a failure
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*/
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virtual bool seek(int32 offset, int whence = SEEK_SET) = 0;
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/**
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* TODO: Get rid of this??? Or keep it and document it
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* @return true on success, false in case of a failure
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*/
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virtual bool skip(uint32 offset) { return seek(offset, SEEK_CUR); }
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/**
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* Reads at most one less than the number of characters specified
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* by bufSize from the and stores them in the string buf. Reading
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* stops when the end of a line is reached (CR, CR/LF or LF), and
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* at end-of-file or error. The newline, if any, is retained (CR
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* and CR/LF are translated to LF = 0xA = '\n'). If any characters
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* are read and there is no error, a `\0' character is appended
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* to end the string.
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*
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* Upon successful completion, return a pointer to the string. If
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* end-of-file occurs before any characters are read, returns NULL
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* and the buffer contents remain unchanged. If an error occurs,
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* returns NULL and the buffer contents are indeterminate.
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* This method does not distinguish between end-of-file and error;
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* callers must use err() or eos() to determine which occurred.
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*
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* @note This methods is closely modeled after the standard fgets()
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* function from stdio.h.
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*
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* @param buf the buffer to store into
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* @param bufSize the size of the buffer
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* @return a pointer to the read string, or NULL if an error occurred
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*/
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virtual char *readLine_NEW(char *s, size_t bufSize);
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/**
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* Reads a full line and returns it as a Common::String. Reading
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* stops when the end of a line is reached (CR, CR/LF or LF), and
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* at end-of-file or error.
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*
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* Upon successful completion, return a string with the content
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* of the line, *without* the end of a line marker. This method
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* does not indicate whether an error occured. Callers must use
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* err() or eos() to determine whether an exception occurred.
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*/
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virtual String readLine();
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};
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/**
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* SubReadStream provides access to a ReadStream restricted to the range
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* [currentPosition, currentPosition+end).
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* Manipulating the parent stream directly /will/ mess up a substream.
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* Likewise, manipulating two substreams of a parent stream will cause them to
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* step on each others toes.
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*/
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class SubReadStream : virtual public ReadStream {
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protected:
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ReadStream *_parentStream;
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bool _disposeParentStream;
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uint32 _pos;
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uint32 _end;
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bool _eos;
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public:
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SubReadStream(ReadStream *parentStream, uint32 end, bool disposeParentStream = false)
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: _parentStream(parentStream),
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_disposeParentStream(disposeParentStream),
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_pos(0),
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_end(end),
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_eos(false) {
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assert(parentStream);
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}
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~SubReadStream() {
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if (_disposeParentStream) delete _parentStream;
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}
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virtual bool eos() const { return _eos; }
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virtual bool err() const { return _parentStream->err(); }
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virtual void clearErr() { _eos = false; _parentStream->clearErr(); }
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virtual uint32 read(void *dataPtr, uint32 dataSize);
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};
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/*
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* SeekableSubReadStream provides access to a SeekableReadStream restricted to
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* the range [begin, end).
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* The same caveats apply to SeekableSubReadStream as do to SeekableReadStream.
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*/
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class SeekableSubReadStream : public SubReadStream, public SeekableReadStream {
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protected:
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SeekableReadStream *_parentStream;
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uint32 _begin;
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public:
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SeekableSubReadStream(SeekableReadStream *parentStream, uint32 begin, uint32 end, bool disposeParentStream = false);
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virtual int32 pos() const { return _pos - _begin; }
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virtual int32 size() const { return _end - _begin; }
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virtual bool seek(int32 offset, int whence = SEEK_SET);
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};
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/**
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* This is a wrapper around SeekableSubReadStream, but it adds non-endian
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* read methods whose endianness is set on the stream creation.
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*/
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class SeekableSubReadStreamEndian : public SeekableSubReadStream {
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public:
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bool _bigEndian;
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SeekableSubReadStreamEndian(SeekableReadStream *parentStream, uint32 begin, uint32 end, bool bigEndian = false, bool disposeParentStream = false)
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: SeekableSubReadStream(parentStream, begin, end, disposeParentStream), _bigEndian(bigEndian) {
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}
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inline uint16 readUint16() {
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return (_bigEndian) ? readUint16BE() : readUint16LE();
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}
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inline uint32 readUint32() {
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return (_bigEndian) ? readUint32BE() : readUint32LE();
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}
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inline int16 readSint16() {
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return (int16)readUint16();
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}
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inline int32 readSint32() {
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return (int32)readUint32();
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}
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};
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/**
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* Wrapper class which adds buffering to any given ReadStream.
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* Users can specify how big the buffer should be, and whether the
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* wrapped stream should be disposed when the wrapper is disposed.
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*/
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class BufferedReadStream : virtual public ReadStream {
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protected:
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ReadStream *_parentStream;
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bool _disposeParentStream;
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byte *_buf;
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uint32 _pos;
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uint32 _bufSize;
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uint32 _realBufSize;
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public:
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BufferedReadStream(ReadStream *parentStream, uint32 bufSize, bool disposeParentStream = false);
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~BufferedReadStream();
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virtual bool eos() const { return (_pos == _bufSize) && _parentStream->eos(); }
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virtual bool err() const { return _parentStream->err(); }
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virtual void clearErr() { _parentStream->clearErr(); }
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virtual uint32 read(void *dataPtr, uint32 dataSize);
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};
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/**
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* Wrapper class which adds buffering to any given SeekableReadStream.
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* @see BufferedReadStream
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*/
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class BufferedSeekableReadStream : public BufferedReadStream, public SeekableReadStream {
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protected:
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SeekableReadStream *_parentStream;
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public:
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BufferedSeekableReadStream(SeekableReadStream *parentStream, uint32 bufSize, bool disposeParentStream = false);
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virtual int32 pos() const { return _parentStream->pos() - (_bufSize - _pos); }
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virtual int32 size() const { return _parentStream->size(); }
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virtual bool seek(int32 offset, int whence = SEEK_SET);
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};
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/**
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* Simple memory based 'stream', which implements the ReadStream interface for
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* a plain memory block.
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*/
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class MemoryReadStream : public SeekableReadStream {
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private:
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const byte * const _ptrOrig;
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const byte *_ptr;
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const uint32 _size;
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uint32 _pos;
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byte _encbyte;
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bool _disposeMemory;
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bool _eos;
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public:
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/**
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* This constructor takes a pointer to a memory buffer and a length, and
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|
* wraps it. If disposeMemory is true, the MemoryReadStream takes ownership
|
|
* of the buffer and hence free's it when destructed.
|
|
*/
|
|
MemoryReadStream(const byte *dataPtr, uint32 dataSize, bool disposeMemory = false) :
|
|
_ptrOrig(dataPtr),
|
|
_ptr(dataPtr),
|
|
_size(dataSize),
|
|
_pos(0),
|
|
_encbyte(0),
|
|
_disposeMemory(disposeMemory),
|
|
_eos(false) {}
|
|
|
|
~MemoryReadStream() {
|
|
if (_disposeMemory)
|
|
free(const_cast<byte *>(_ptrOrig));
|
|
}
|
|
|
|
void setEnc(byte value) { _encbyte = value; }
|
|
|
|
uint32 read(void *dataPtr, uint32 dataSize);
|
|
|
|
bool eos() const { return _eos; }
|
|
void clearErr() { _eos = false; }
|
|
|
|
int32 pos() const { return _pos; }
|
|
int32 size() const { return _size; }
|
|
|
|
bool seek(int32 offs, int whence = SEEK_SET);
|
|
};
|
|
|
|
|
|
/**
|
|
* This is a wrapper around MemoryReadStream, but it adds non-endian
|
|
* read methods whose endianness is set on the stream creation.
|
|
*/
|
|
class MemoryReadStreamEndian : public Common::MemoryReadStream {
|
|
private:
|
|
public:
|
|
bool _bigEndian;
|
|
MemoryReadStreamEndian(const byte *buf, uint32 len, bool bigEndian = false) : MemoryReadStream(buf, len), _bigEndian(bigEndian) {}
|
|
|
|
inline uint16 readUint16() {
|
|
return (_bigEndian) ? readUint16BE() : readUint16LE();
|
|
}
|
|
|
|
inline uint32 readUint32() {
|
|
return (_bigEndian) ? readUint32BE() : readUint32LE();
|
|
}
|
|
|
|
inline int16 readSint16() {
|
|
return (int16)readUint16();
|
|
}
|
|
|
|
inline int32 readSint32() {
|
|
return (int32)readUint32();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Simple memory based 'stream', which implements the WriteStream interface for
|
|
* a plain memory block.
|
|
*/
|
|
class MemoryWriteStream : public WriteStream {
|
|
private:
|
|
byte *_ptr;
|
|
const uint32 _bufSize;
|
|
uint32 _pos;
|
|
public:
|
|
MemoryWriteStream(byte *buf, uint32 len) : _ptr(buf), _bufSize(len), _pos(0) {}
|
|
|
|
uint32 write(const void *dataPtr, uint32 dataSize) {
|
|
// Write at most as many bytes as are still available...
|
|
if (dataSize > _bufSize - _pos)
|
|
dataSize = _bufSize - _pos;
|
|
memcpy(_ptr, dataPtr, dataSize);
|
|
_ptr += dataSize;
|
|
_pos += dataSize;
|
|
return dataSize;
|
|
}
|
|
|
|
uint32 pos() const { return _pos; }
|
|
uint32 size() const { return _bufSize; }
|
|
};
|
|
|
|
/**
|
|
* A sort of hybrid between MemoryWriteStream and Array classes. A stream
|
|
* that grows as it's written to.
|
|
*/
|
|
class MemoryWriteStreamDynamic : public Common::WriteStream {
|
|
private:
|
|
uint32 _capacity;
|
|
uint32 _size;
|
|
byte *_ptr;
|
|
byte *_data;
|
|
uint32 _pos;
|
|
bool _disposeMemory;
|
|
|
|
void ensureCapacity(uint32 new_len) {
|
|
if (new_len <= _capacity)
|
|
return;
|
|
|
|
byte *old_data = _data;
|
|
|
|
_capacity = new_len + 32;
|
|
_data = new byte[_capacity];
|
|
_ptr = _data + _pos;
|
|
|
|
if (old_data) {
|
|
// Copy old data
|
|
memcpy(_data, old_data, _size);
|
|
delete[] old_data;
|
|
}
|
|
|
|
_size = new_len;
|
|
}
|
|
public:
|
|
MemoryWriteStreamDynamic(bool disposeMemory = false) : _capacity(0), _size(0), _ptr(0), _data(0), _pos(0), _disposeMemory(disposeMemory) {}
|
|
|
|
~MemoryWriteStreamDynamic() {
|
|
if (_disposeMemory)
|
|
delete[] _data;
|
|
}
|
|
|
|
uint32 write(const void *dataPtr, uint32 dataSize) {
|
|
ensureCapacity(_pos + dataSize);
|
|
memcpy(_ptr, dataPtr, dataSize);
|
|
_ptr += dataSize;
|
|
_pos += dataSize;
|
|
if (_pos > _size)
|
|
_size = _pos;
|
|
return dataSize;
|
|
}
|
|
|
|
uint32 pos() const { return _pos; }
|
|
uint32 size() const { return _size; }
|
|
|
|
byte *getData() { return _data; }
|
|
};
|
|
|
|
} // End of namespace Common
|
|
|
|
#endif
|