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// Copyright (C) 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
* Copyright (C) 2000, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
*
* File writejava.c
*
* Modification History:
*
* Date Name Description
* 01/11/02 Ram Creation.
*******************************************************************************
*/
#ifndef RLE_H
#define RLE_H 1
#include "unicode/utypes.h"
#include "unicode/ustring.h"
U_CDECL_BEGIN
/**
* Construct a string representing a byte array. Use run-length encoding.
* Two bytes are packed into a single char, with a single extra zero byte at
* the end if needed. A byte represents itself, unless it is the
* ESCAPE_BYTE. Then the following notations are possible:
* ESCAPE_BYTE ESCAPE_BYTE ESCAPE_BYTE literal
* ESCAPE_BYTE n b n instances of byte b
* Since an encoded run occupies 3 bytes, we only encode runs of 4 or
* more bytes. Thus we have n > 0 and n != ESCAPE_BYTE and n <= 0xFF.
* If we encounter a run where n == ESCAPE_BYTE, we represent this as:
* b ESCAPE_BYTE n-1 b
* The ESCAPE_BYTE value is chosen so as not to collide with commonly
* seen values.
*/
int32_t
byteArrayToRLEString(const uint8_t* src,int32_t srcLen, uint16_t* buffer,int32_t bufLen, UErrorCode* status);
/**
* Construct a string representing a char array. Use run-length encoding.
* A character represents itself, unless it is the ESCAPE character. Then
* the following notations are possible:
* ESCAPE ESCAPE ESCAPE literal
* ESCAPE n c n instances of character c
* Since an encoded run occupies 3 characters, we only encode runs of 4 or
* more characters. Thus we have n > 0 and n != ESCAPE and n <= 0xFFFF.
* If we encounter a run where n == ESCAPE, we represent this as:
* c ESCAPE n-1 c
* The ESCAPE value is chosen so as not to collide with commonly
* seen values.
*/
int32_t
usArrayToRLEString(const uint16_t* src,int32_t srcLen,uint16_t* buffer, int32_t bufLen,UErrorCode* status);
/**
* Construct an array of bytes from a run-length encoded string.
*/
int32_t
rleStringToByteArray(uint16_t* src, int32_t srcLen, uint8_t* target, int32_t tgtLen, UErrorCode* status);
/**
* Construct an array of shorts from a run-length encoded string.
*/
int32_t
rleStringToUCharArray(uint16_t* src, int32_t srcLen, uint16_t* target, int32_t tgtLen, UErrorCode* status);
U_CDECL_END
#endif
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