mirror of
https://github.com/libretro/scummvm.git
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55db9e92e9
This reverts commit bed3550cbd
.
721 lines
20 KiB
C++
721 lines
20 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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*
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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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*
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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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*/
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#ifndef COMMON_STREAM_H
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#define COMMON_STREAM_H
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#include "common/endian.h"
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#include "common/scummsys.h"
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#include "common/str.h"
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namespace Common {
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class ReadStream;
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class SeekableReadStream;
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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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* @note The semantics of any implementation of this method are
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* supposed to match those of ISO C ferror().
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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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* @note The semantics of any implementation of this method are
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* supposed to match those of ISO C clearerr().
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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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* @note The semantics of any implementation of this method are
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* supposed to match those of ISO C fwrite().
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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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* @note The semantics of any implementation of this method are
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* supposed to match those of ISO C fflush().
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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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/**
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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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// 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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value = TO_LE_16(value);
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write(&value, 2);
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}
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void writeUint32LE(uint32 value) {
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value = TO_LE_32(value);
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write(&value, 4);
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}
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void writeUint64LE(uint64 value) {
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value = TO_LE_64(value);
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write(&value, 8);
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}
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void writeUint16BE(uint16 value) {
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value = TO_BE_16(value);
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write(&value, 2);
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}
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void writeUint32BE(uint32 value) {
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value = TO_BE_32(value);
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write(&value, 4);
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}
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void writeUint64BE(uint64 value) {
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value = TO_BE_64(value);
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write(&value, 8);
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}
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FORCEINLINE void writeSint16LE(int16 value) {
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writeUint16LE((uint16)value);
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}
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FORCEINLINE void writeSint32LE(int32 value) {
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writeUint32LE((uint32)value);
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}
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FORCEINLINE void writeSint64LE(int64 value) {
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writeUint64LE((uint64)value);
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}
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FORCEINLINE void writeSint16BE(int16 value) {
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writeUint16BE((uint16)value);
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}
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FORCEINLINE void writeSint32BE(int32 value) {
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writeUint32BE((uint32)value);
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}
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FORCEINLINE void writeSint64BE(int64 value) {
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writeUint64BE((uint64)value);
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}
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/**
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* Write the given 32-bit floating point value stored
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* in little endian(LSB first) order into the stream.
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*/
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FORCEINLINE void writeFloatLE(float value) {
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uint32 n;
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memcpy(&n, &value, 4);
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writeUint32LE(n);
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}
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/**
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* Write the given 32-bit floating point value stored
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* in big endian order into the stream.
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*/
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FORCEINLINE void writeFloatBE(float value) {
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uint32 n;
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memcpy(&n, &value, 4);
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writeUint32BE(n);
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}
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/**
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* Write the given 64-bit floating point value stored
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* in little endian(LSB first) order into the stream.
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*/
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FORCEINLINE void writeDoubleLE(double value) {
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uint64 n;
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memcpy(&n, &value, 8);
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writeUint64LE(n);
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}
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/**
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* Write the given 64-bit floating point value stored
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* in big endian order into the stream.
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*/
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FORCEINLINE void writeDoubleBE(double value) {
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uint64 n;
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memcpy(&n, &value, 8);
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writeUint64BE(n);
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}
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/**
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* Write data from another stream to this one.
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*/
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uint32 writeStream(ReadStream *stream, uint32 dataSize);
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uint32 writeStream(SeekableReadStream *stream);
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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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* Derived abstract base class for write streams streams that are seekable
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*/
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class SeekableWriteStream : public WriteStream {
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public:
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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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* @note The semantics of any implementation of this method are
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* supposed to match those of ISO C fseek().
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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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* Obtains the current 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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/**
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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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ReadStream() {}
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/**
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* Returns true if a read failed because the stream end 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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* @note The semantics of any implementation of this method are
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* supposed to match those of ISO C feof(). In particular, in a stream
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* with N bytes, reading exactly N bytes from the start should *not*
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* set eos; only reading *beyond* the available data should set it.
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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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* @note The semantics of any implementation of this method are
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* supposed to match those of ISO C fread(), in particular where
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* it concerns setting error and end of file/stream flags.
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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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* 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; // FIXME: remove initialisation
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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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FORCEINLINE int8 readSByte() {
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return (int8)readByte();
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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 val;
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read(&val, 2);
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return FROM_LE_16(val);
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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 val;
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read(&val, 4);
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return FROM_LE_32(val);
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}
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/**
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* Read an unsigned 64-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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uint64 readUint64LE() {
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uint64 val;
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read(&val, 8);
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return FROM_LE_64(val);
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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 val;
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read(&val, 2);
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return FROM_BE_16(val);
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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 val;
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read(&val, 4);
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return FROM_BE_32(val);
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}
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/**
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* Read an unsigned 64-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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uint64 readUint64BE() {
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uint64 val;
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read(&val, 8);
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return FROM_BE_64(val);
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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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FORCEINLINE 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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FORCEINLINE int32 readSint32LE() {
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return (int32)readUint32LE();
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}
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/**
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* Read a signed 64-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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FORCEINLINE int64 readSint64LE() {
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return (int64)readUint64LE();
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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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FORCEINLINE 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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FORCEINLINE int32 readSint32BE() {
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return (int32)readUint32BE();
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}
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/**
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* Read a signed 64-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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FORCEINLINE int64 readSint64BE() {
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return (int64)readUint64BE();
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}
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|
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/**
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* Read a 32-bit floating point value stored in little endian (LSB first)
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* order 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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FORCEINLINE float readFloatLE() {
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uint32 n = readUint32LE();
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float f;
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memcpy(&f, &n, 4);
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return f;
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}
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|
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/**
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* Read a 32-bit floating point value stored in big endian
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* order 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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FORCEINLINE float readFloatBE() {
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uint32 n = readUint32BE();
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float f;
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memcpy(&f, &n, 4);
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return f;
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}
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|
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|
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/**
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* Read a 64-bit floating point value stored in little endian (LSB first)
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* order 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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FORCEINLINE double readDoubleLE() {
|
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uint64 n = readUint64LE();
|
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double d;
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memcpy(&d, &n, 8);
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return d;
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}
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|
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/**
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* Read a 64-bit floating point value stored in big endian
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* order 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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FORCEINLINE double readDoubleBE() {
|
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uint64 n = readUint64BE();
|
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double d;
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memcpy(&d, &n, 8);
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return d;
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}
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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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SeekableReadStream *readStream(uint32 dataSize);
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|
|
/**
|
|
* Read stream in Pascal format, that is, one byte is
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* string length, followed by string data
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|
*
|
|
* @param transformCR if set (default), then transform \r into \n
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*/
|
|
Common::String readPascalString(bool transformCR = true);
|
|
|
|
};
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|
|
|
|
|
/**
|
|
* Interface for a seekable & readable data stream.
|
|
*
|
|
* @todo Get rid of SEEK_SET, SEEK_CUR, or SEEK_END, use our own constants
|
|
*/
|
|
class SeekableReadStream : virtual public ReadStream {
|
|
public:
|
|
|
|
/**
|
|
* Obtains the current value of the stream position indicator of the
|
|
* stream.
|
|
*
|
|
* @return the current position indicator, or -1 if an error occurred.
|
|
*/
|
|
virtual int32 pos() const = 0;
|
|
|
|
/**
|
|
* Obtains the total size of the stream, measured in bytes.
|
|
* If this value is unknown or can not be computed, -1 is returned.
|
|
*
|
|
* @return the size of the stream, or -1 if an error occurred
|
|
*/
|
|
virtual int32 size() const = 0;
|
|
|
|
/**
|
|
* Sets the stream position indicator for the stream. The new position,
|
|
* measured in bytes, is obtained by adding offset bytes to the position
|
|
* specified by whence. If whence is set to SEEK_SET, SEEK_CUR, or
|
|
* SEEK_END, the offset is relative to the start of the file, the current
|
|
* position indicator, or end-of-file, respectively. A successful call
|
|
* to the seek() method clears the end-of-file indicator for the stream.
|
|
*
|
|
* @note The semantics of any implementation of this method are
|
|
* supposed to match those of ISO C fseek().
|
|
*
|
|
* @param offset the relative offset in bytes
|
|
* @param whence the seek reference: SEEK_SET, SEEK_CUR, or SEEK_END
|
|
* @return true on success, false in case of a failure
|
|
*/
|
|
virtual bool seek(int32 offset, int whence = SEEK_SET) = 0;
|
|
|
|
/**
|
|
* TODO: Get rid of this??? Or keep it and document it
|
|
* @return true on success, false in case of a failure
|
|
*/
|
|
virtual bool skip(uint32 offset) { return seek(offset, SEEK_CUR); }
|
|
|
|
/**
|
|
* Reads at most one less than the number of characters specified
|
|
* by bufSize from the and stores them in the string buf. Reading
|
|
* stops when the end of a line is reached (CR, CR/LF or LF), and
|
|
* at end-of-file or error. The newline, if any, is retained (CR
|
|
* and CR/LF are translated to LF = 0xA = '\n'). If any characters
|
|
* are read and there is no error, a `\0' character is appended
|
|
* to end the string.
|
|
*
|
|
* Upon successful completion, return a pointer to the string. If
|
|
* end-of-file occurs before any characters are read, returns NULL
|
|
* and the buffer contents remain unchanged. If an error occurs,
|
|
* returns NULL and the buffer contents are indeterminate.
|
|
* This method does not distinguish between end-of-file and error;
|
|
* callers must use err() or eos() to determine which occurred.
|
|
*
|
|
* @note This methods is closely modeled after the standard fgets()
|
|
* function from stdio.h.
|
|
*
|
|
* @param s the buffer to store into
|
|
* @param bufSize the size of the buffer
|
|
* @param handleCR if set (default), then CR and CR/LF are handled as well as LF
|
|
* @return a pointer to the read string, or NULL if an error occurred
|
|
*/
|
|
virtual char *readLine(char *s, size_t bufSize, bool handleCR = true);
|
|
|
|
|
|
/**
|
|
* Reads a full line and returns it as a Common::String. Reading
|
|
* stops when the end of a line is reached (CR, CR/LF or LF), and
|
|
* at end-of-file or error.
|
|
*
|
|
* Upon successful completion, return a string with the content
|
|
* of the line, *without* the end of a line marker. This method
|
|
* does not indicate whether an error occurred. Callers must use
|
|
* err() or eos() to determine whether an exception occurred.
|
|
*
|
|
* @param handleCR if set (default), then CR and CR/LF are handled as well as LF
|
|
*/
|
|
virtual String readLine(bool handleCR = true);
|
|
|
|
/**
|
|
* Print a hexdump of the stream while maintaing position. The number
|
|
* of bytes per line is customizable.
|
|
* @param len the length of that data
|
|
* @param bytesPerLine number of bytes to print per line (default: 16)
|
|
* @param startOffset shift the shown offsets by the starting offset (default: 0)
|
|
*/
|
|
void hexdump(int len, int bytesPerLine = 16, int startOffset = 0);
|
|
};
|
|
|
|
/**
|
|
* This is a ReadStream mixin subclass which adds non-endian read
|
|
* methods whose endianness is set during the stream creation.
|
|
*/
|
|
class ReadStreamEndian : virtual public ReadStream {
|
|
private:
|
|
const bool _bigEndian;
|
|
|
|
public:
|
|
ReadStreamEndian(bool bigEndian) : _bigEndian(bigEndian) {}
|
|
|
|
bool isBE() const { return _bigEndian; }
|
|
|
|
uint16 readUint16() {
|
|
uint16 val;
|
|
read(&val, 2);
|
|
return (_bigEndian) ? TO_BE_16(val) : TO_LE_16(val);
|
|
}
|
|
|
|
uint32 readUint32() {
|
|
uint32 val;
|
|
read(&val, 4);
|
|
return (_bigEndian) ? TO_BE_32(val) : TO_LE_32(val);
|
|
}
|
|
|
|
uint64 readUint64() {
|
|
uint64 val;
|
|
read(&val, 8);
|
|
return (_bigEndian) ? TO_BE_64(val) : TO_LE_64(val);
|
|
}
|
|
|
|
FORCEINLINE int16 readSint16() {
|
|
return (int16)readUint16();
|
|
}
|
|
|
|
FORCEINLINE int32 readSint32() {
|
|
return (int32)readUint32();
|
|
}
|
|
|
|
FORCEINLINE int64 readSint64() {
|
|
return (int64)readUint64();
|
|
}
|
|
};
|
|
|
|
/**
|
|
* This is a SeekableReadStream subclass which adds non-endian read
|
|
* methods whose endianness is set during the stream creation.
|
|
*/
|
|
class SeekableReadStreamEndian : virtual public SeekableReadStream, virtual public ReadStreamEndian {
|
|
public:
|
|
SeekableReadStreamEndian(bool bigEndian) : ReadStreamEndian(bigEndian) {}
|
|
};
|
|
|
|
|
|
} // End of namespace Common
|
|
|
|
#endif
|