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comparison: intl/icu/source/tools/genrb/rle.h
intl/icu/source/tools/genrb/rle.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:0b6310517e8c |
|---|---|
| 1 /* | |
| 2 ******************************************************************************* | |
| 3 * | |
| 4 * Copyright (C) 2000, International Business Machines | |
| 5 * Corporation and others. All Rights Reserved. | |
| 6 * | |
| 7 ******************************************************************************* | |
| 8 * | |
| 9 * File writejava.c | |
| 10 * | |
| 11 * Modification History: | |
| 12 * | |
| 13 * Date Name Description | |
| 14 * 01/11/02 Ram Creation. | |
| 15 ******************************************************************************* | |
| 16 */ | |
| 17 | |
| 18 #ifndef RLE_H | |
| 19 #define RLE_H 1 | |
| 20 | |
| 21 #include "unicode/utypes.h" | |
| 22 #include "unicode/ustring.h" | |
| 23 | |
| 24 U_CDECL_BEGIN | |
| 25 /** | |
| 26 * Construct a string representing a byte array. Use run-length encoding. | |
| 27 * Two bytes are packed into a single char, with a single extra zero byte at | |
| 28 * the end if needed. A byte represents itself, unless it is the | |
| 29 * ESCAPE_BYTE. Then the following notations are possible: | |
| 30 * ESCAPE_BYTE ESCAPE_BYTE ESCAPE_BYTE literal | |
| 31 * ESCAPE_BYTE n b n instances of byte b | |
| 32 * Since an encoded run occupies 3 bytes, we only encode runs of 4 or | |
| 33 * more bytes. Thus we have n > 0 and n != ESCAPE_BYTE and n <= 0xFF. | |
| 34 * If we encounter a run where n == ESCAPE_BYTE, we represent this as: | |
| 35 * b ESCAPE_BYTE n-1 b | |
| 36 * The ESCAPE_BYTE value is chosen so as not to collide with commonly | |
| 37 * seen values. | |
| 38 */ | |
| 39 int32_t | |
| 40 byteArrayToRLEString(const uint8_t* src,int32_t srcLen, uint16_t* buffer,int32_t bufLen, UErrorCode* status); | |
| 41 | |
| 42 | |
| 43 /** | |
| 44 * Construct a string representing a char array. Use run-length encoding. | |
| 45 * A character represents itself, unless it is the ESCAPE character. Then | |
| 46 * the following notations are possible: | |
| 47 * ESCAPE ESCAPE ESCAPE literal | |
| 48 * ESCAPE n c n instances of character c | |
| 49 * Since an encoded run occupies 3 characters, we only encode runs of 4 or | |
| 50 * more characters. Thus we have n > 0 and n != ESCAPE and n <= 0xFFFF. | |
| 51 * If we encounter a run where n == ESCAPE, we represent this as: | |
| 52 * c ESCAPE n-1 c | |
| 53 * The ESCAPE value is chosen so as not to collide with commonly | |
| 54 * seen values. | |
| 55 */ | |
| 56 int32_t | |
| 57 usArrayToRLEString(const uint16_t* src,int32_t srcLen,uint16_t* buffer, int32_t bufLen,UErrorCode* status); | |
| 58 | |
| 59 /** | |
| 60 * Construct an array of bytes from a run-length encoded string. | |
| 61 */ | |
| 62 int32_t | |
| 63 rleStringToByteArray(uint16_t* src, int32_t srcLen, uint8_t* target, int32_t tgtLen, UErrorCode* status); | |
| 64 /** | |
| 65 * Construct an array of shorts from a run-length encoded string. | |
| 66 */ | |
| 67 int32_t | |
| 68 rleStringToUCharArray(uint16_t* src, int32_t srcLen, uint16_t* target, int32_t tgtLen, UErrorCode* status); | |
| 69 | |
| 70 U_CDECL_END | |
| 71 | |
| 72 #endif |
