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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_WRITABLE_FONT_DATA_H_
#define SFNTLY_CPP_SRC_SFNTLY_DATA_WRITABLE_FONT_DATA_H_
#include "sfntly/data/readable_font_data.h"
namespace sfntly {
// Writable font data wrapper. Supports writing of data primitives in the
// TrueType / OpenType spec.
class WritableFontData : public ReadableFontData {
public:
explicit WritableFontData(ByteArray* ba);
virtual ~WritableFontData();
// Constructs a writable font data object. If the length is specified as
// positive then a fixed size font data object will be created. If the length
// is zero or less then a growable font data object will be created and the
// size will be used as an estimate to help in allocating the original space.
// @param length if length > 0 create a fixed length font data; otherwise
// create a growable font data
// @return a new writable font data
static CALLER_ATTACH WritableFontData* CreateWritableFontData(int32_t length);
// Constructs a writable font data object. The new font data object will wrap
// the bytes passed in to the factory and it will take make a copy of those
// bytes.
// @param b the byte vector to wrap
// @return a new writable font data
static CALLER_ATTACH WritableFontData* CreateWritableFontData(ByteVector* b);
// Write a byte at the given index.
// @param index index into the font data
// @param b the byte to write
// @return the number of bytes written
virtual int32_t WriteByte(int32_t index, byte_t b);
// Write the bytes from the array.
// @param index index into the font data
// @param b the source for the bytes to be written
// @param offset offset in the byte array
// @param length the length of the bytes to be written
// @return the number of bytes actually written; -1 if the index is outside
// the FontData's range
virtual int32_t WriteBytes(int32_t index,
byte_t* b,
int32_t offset,
int32_t length);
// Write the bytes from the array.
// @param index index into the font data
// @param b the source for the bytes to be written
// @return the number of bytes actually written; -1 if the index is outside
// the FontData's range
virtual int32_t WriteBytes(int32_t index, ByteVector* b);
// Write the bytes from the array and pad if necessary.
// Write to the length given using the byte array provided and if there are
// not enough bytes in the array then pad to the requested length using the
// pad byte specified.
// @param index index into the font data
// @param b the source for the bytes to be written
// @param offset offset in the byte array
// @param length the length of the bytes to be written
// @param pad the padding byte to be used if necessary
// @return the number of bytes actually written
virtual int32_t WriteBytesPad(int32_t index,
ByteVector* b,
int32_t offset,
int32_t length,
byte_t pad);
// Writes padding to the FontData. The padding byte written is 0x00.
// @param index index into the font data
// @param count the number of pad bytes to write
// @return the number of pad bytes written
virtual int32_t WritePadding(int32_t index, int32_t count);
// Writes padding to the FontData.
// @param index index into the font data
// @param count the number of pad bytes to write
// @param pad the byte value to use as padding
// @return the number of pad bytes written
virtual int32_t WritePadding(int32_t index, int32_t count, byte_t pad);
// Write the CHAR at the given index.
// @param index index into the font data
// @param c the CHAR
// @return the number of bytes actually written
// @throws IndexOutOfBoundsException if index is outside the FontData's range
virtual int32_t WriteChar(int32_t index, byte_t c);
// Write the USHORT at the given index.
// @param index index into the font data
// @param us the USHORT
// @return the number of bytes actually written
// @throws IndexOutOfBoundsException if index is outside the FontData's range
virtual int32_t WriteUShort(int32_t index, int32_t us);
// Write the USHORT at the given index in little endian format.
// @param index index into the font data
// @param us the USHORT
// @return the number of bytes actually written
// @throws IndexOutOfBoundsException if index is outside the FontData's range
virtual int32_t WriteUShortLE(int32_t index, int32_t us);
// Write the SHORT at the given index.
// @param index index into the font data
// @param s the SHORT
// @return the number of bytes actually written
// @throws IndexOutOfBoundsException if index is outside the FontData's range
virtual int32_t WriteShort(int32_t index, int32_t s);
// Write the UINT24 at the given index.
// @param index index into the font data
// @param ui the UINT24
// @return the number of bytes actually written
// @throws IndexOutOfBoundsException if index is outside the FontData's range
virtual int32_t WriteUInt24(int32_t index, int32_t ui);
// Write the ULONG at the given index.
// @param index index into the font data
// @param ul the ULONG
// @return the number of bytes actually written
// @throws IndexOutOfBoundsException if index is outside the FontData's range
virtual int32_t WriteULong(int32_t index, int64_t ul);
// Write the ULONG at the given index in little endian format.
// @param index index into the font data
// @param ul the ULONG
// @return the number of bytes actually written
// @throws IndexOutOfBoundsException if index is outside the FontData's range
virtual int32_t WriteULongLE(int32_t index, int64_t ul);
// Write the LONG at the given index.
// @param index index into the font data
// @param l the LONG
// @return the number of bytes actually written
// @throws IndexOutOfBoundsException if index is outside the FontData's range
virtual int32_t WriteLong(int32_t index, int64_t l);
// Write the Fixed at the given index.
// @param index index into the font data
// @param f the Fixed
// @return the number of bytes actually written
// @throws IndexOutOfBoundsException if index is outside the FontData's range
virtual int32_t WriteFixed(int32_t index, int32_t f);
// Write the LONGDATETIME at the given index.
// @param index index into the font data
// @param date the LONGDATETIME
// @return the number of bytes actually written
// @throws IndexOutOfBoundsException if index is outside the FontData's range
virtual int32_t WriteDateTime(int32_t index, int64_t date);
// Copy from the InputStream into this FontData.
// @param is the source
// @param length the number of bytes to copy
// @throws IOException
virtual void CopyFrom(InputStream* is, int32_t length);
// Copy everything from the InputStream into this FontData.
// @param is the source
// @throws IOException
virtual void CopyFrom(InputStream* is);
// Makes a slice of this FontData. The returned slice will share the data with
// the original FontData.
// @param offset the start of the slice
// @param length the number of bytes in the slice
// @return a slice of the original FontData
virtual CALLER_ATTACH FontData* Slice(int32_t offset, int32_t length);
// Makes a bottom bound only slice of this array. The returned slice will
// share the data with the original FontData.
// @param offset the start of the slice
// @return a slice of the original FontData
virtual CALLER_ATTACH FontData* Slice(int32_t offset);
private:
// Constructor with a lower bound.
// @param data other WritableFontData object to share data with
// @param offset offset from the other WritableFontData's data
WritableFontData(WritableFontData* data, int32_t offset);
// Constructor with lower bound and a length bound.
// @param data other WritableFontData object to share data with
// @param offset offset from the other WritableFontData's data
// @param length length of other WritableFontData's data to use
WritableFontData(WritableFontData* data, int32_t offset, int32_t length);
};
typedef Ptr<WritableFontData> WritableFontDataPtr;
} // namespace sfntly
#endif // SFNTLY_CPP_SRC_SFNTLY_DATA_WRITABLE_FONT_DATA_H_
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