projects / apple / icu.git / blame
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|---|---|---|
| f3c0d7a5 A |
1 | // © 2016 and later: Unicode, Inc. and others. |
| 2 | // License & terms of use: http://www.unicode.org/copyright.html | |
| b75a7d8f A |
3 | /* |
| 4 | ******************************************************************************* | |
| 5 | * | |
| 6 | * Copyright (C) 2000, International Business Machines | |
| 7 | * Corporation and others. All Rights Reserved. | |
| 8 | * | |
| 9 | ******************************************************************************* | |
| 10 | * | |
| 11 | * File writejava.c | |
| 12 | * | |
| 13 | * Modification History: | |
| 14 | * | |
| 15 | * Date Name Description | |
| 16 | * 01/11/02 Ram Creation. | |
| 17 | ******************************************************************************* | |
| 18 | */ | |
| 19 | ||
| 20 | #ifndef RLE_H | |
| 21 | #define RLE_H 1 | |
| 22 | ||
| 23 | #include "unicode/utypes.h" | |
| 24 | #include "unicode/ustring.h" | |
| 25 | ||
| 26 | U_CDECL_BEGIN | |
| 27 | /** | |
| 28 | * Construct a string representing a byte array. Use run-length encoding. | |
| 29 | * Two bytes are packed into a single char, with a single extra zero byte at | |
| 30 | * the end if needed. A byte represents itself, unless it is the | |
| 31 | * ESCAPE_BYTE. Then the following notations are possible: | |
| 32 | * ESCAPE_BYTE ESCAPE_BYTE ESCAPE_BYTE literal | |
| 33 | * ESCAPE_BYTE n b n instances of byte b | |
| 34 | * Since an encoded run occupies 3 bytes, we only encode runs of 4 or | |
| 35 | * more bytes. Thus we have n > 0 and n != ESCAPE_BYTE and n <= 0xFF. | |
| 36 | * If we encounter a run where n == ESCAPE_BYTE, we represent this as: | |
| 37 | * b ESCAPE_BYTE n-1 b | |
| 38 | * The ESCAPE_BYTE value is chosen so as not to collide with commonly | |
| 39 | * seen values. | |
| 40 | */ | |
| 41 | int32_t | |
| 42 | byteArrayToRLEString(const uint8_t* src,int32_t srcLen, uint16_t* buffer,int32_t bufLen, UErrorCode* status); | |
| 43 | ||
| 44 | ||
| 45 | /** | |
| 46 | * Construct a string representing a char array. Use run-length encoding. | |
| 47 | * A character represents itself, unless it is the ESCAPE character. Then | |
| 48 | * the following notations are possible: | |
| 49 | * ESCAPE ESCAPE ESCAPE literal | |
| 50 | * ESCAPE n c n instances of character c | |
| 51 | * Since an encoded run occupies 3 characters, we only encode runs of 4 or | |
| 52 | * more characters. Thus we have n > 0 and n != ESCAPE and n <= 0xFFFF. | |
| 53 | * If we encounter a run where n == ESCAPE, we represent this as: | |
| 54 | * c ESCAPE n-1 c | |
| 55 | * The ESCAPE value is chosen so as not to collide with commonly | |
| 56 | * seen values. | |
| 57 | */ | |
| 58 | int32_t | |
| 59 | usArrayToRLEString(const uint16_t* src,int32_t srcLen,uint16_t* buffer, int32_t bufLen,UErrorCode* status); | |
| 60 | ||
| 61 | /** | |
| 62 | * Construct an array of bytes from a run-length encoded string. | |
| 63 | */ | |
| 64 | int32_t | |
| 65 | rleStringToByteArray(uint16_t* src, int32_t srcLen, uint8_t* target, int32_t tgtLen, UErrorCode* status); | |
| 66 | /** | |
| 67 | * Construct an array of shorts from a run-length encoded string. | |
| 68 | */ | |
| 69 | int32_t | |
| 70 | rleStringToUCharArray(uint16_t* src, int32_t srcLen, uint16_t* target, int32_t tgtLen, UErrorCode* status); | |
| 71 | ||
| 72 | U_CDECL_END | |
| 73 | ||
| 74 | #endif |