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