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/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* Licensed 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.
*/
#ifndef SFNTLY_CPP_SRC_SFNTLY_DATA_FONT_INPUT_STREAM_H_
#define SFNTLY_CPP_SRC_SFNTLY_DATA_FONT_INPUT_STREAM_H_
#include "sfntly/port/type.h"
#include "sfntly/port/input_stream.h"
namespace sfntly {
// An input stream for reading font data.
// The data types used are as listed:
// BYTE 8-bit unsigned integer.
// CHAR 8-bit signed integer.
// USHORT 16-bit unsigned integer.
// SHORT 16-bit signed integer.
// UINT24 24-bit unsigned integer.
// ULONG 32-bit unsigned integer.
// LONG 32-bit signed integer.
// Fixed 32-bit signed fixed-point number (16.16)
// FUNIT Smallest measurable distance in the em space.
// FWORD 16-bit signed integer (SHORT) that describes a quantity in FUnits.
// UFWORD 16-bit unsigned integer (USHORT) that describes a quantity in
// FUnits.
// F2DOT14 16-bit signed fixed number with the low 14 bits of fraction (2.14)
// LONGDATETIME Date represented in number of seconds since 12:00 midnight,
// January 1, 1904. The value is represented as a signed 64-bit
// integer.
// Note: Original class inherits from Java's FilterOutputStream, which wraps
// an InputStream within. In C++, we directly do the wrapping without
// defining another layer of abstraction. The wrapped output stream is
// *NOT* reference counted (because it's meaningless to ref-count an I/O
// stream).
class FontInputStream : public InputStream {
public:
// Constructor.
// @param is input stream to wrap
explicit FontInputStream(InputStream* is);
// Constructor for a bounded font input stream.
// @param is input stream to wrap
// @param length the maximum length of bytes to read
FontInputStream(InputStream* is, size_t length);
virtual ~FontInputStream();
virtual int32_t Available();
virtual void Close();
virtual void Mark(int32_t readlimit);
virtual bool MarkSupported();
virtual void Reset();
virtual int32_t Read();
virtual int32_t Read(ByteVector* buffer);
virtual int32_t Read(ByteVector* buffer, int32_t offset, int32_t length);
// Get the current position in the stream in bytes.
// @return the current position in bytes
virtual int64_t position() { return position_; }
virtual int32_t ReadChar();
virtual int32_t ReadUShort();
virtual int32_t ReadShort();
virtual int32_t ReadUInt24();
virtual int64_t ReadULong();
virtual int32_t ReadULongAsInt();
virtual int32_t ReadLong();
virtual int32_t ReadFixed();
virtual int64_t ReadDateTimeAsLong();
virtual int64_t Skip(int64_t n); // n can be negative.
private:
InputStream* stream_;
int64_t position_;
int64_t length_; // Bound on length of data to read.
bool bounded_;
};
} // namespace sfntly
#endif // SFNTLY_CPP_SRC_SFNTLY_DATA_FONT_INPUT_STREAM_H_
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