1017 lines
31 KiB
C
1017 lines
31 KiB
C
/*
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******************************************************************************
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*
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* Copyright (C) 2002-2003, 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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* file name: bocu1tst.c
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2002may27
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* created by: Markus W. Scherer
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*
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* This is the reference implementation of BOCU-1,
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* the MIME-friendly form of the Binary Ordered Compression for Unicode,
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* taken directly from ### http://oss.software.ibm.com/cvs/icu/icuhtml/design/conversion/bocu1/
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* The files bocu1.h and bocu1.c from the design folder are taken
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* verbatim (minus copyright and #include) and copied together into this file.
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* The reference code and some of the reference bocu1tst.c
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* is modified to run as part of the ICU cintltst
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* test framework (minus main(), log_ln() etc. instead of printf()).
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*
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* This reference implementation is used here to verify
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* the ICU BOCU-1 implementation, which is
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* adapted for ICU conversion APIs and optimized.
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* ### links in design doc to here and to ucnvbocu.c
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*/
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#include "unicode/utypes.h"
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#include "unicode/ustring.h"
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#include "unicode/ucnv.h"
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#include "cmemory.h"
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#include "cintltst.h"
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#define LENGTHOF(array) (sizeof(array)/sizeof((array)[0]))
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/* icuhtml/design/conversion/bocu1/bocu1.h ---------------------------------- */
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/* BOCU-1 constants and macros ---------------------------------------------- */
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/*
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* BOCU-1 encodes the code points of a Unicode string as
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* a sequence of byte-encoded differences (slope detection),
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* preserving lexical order.
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*
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* Optimize the difference-taking for runs of Unicode text within
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* small scripts:
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*
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* Most small scripts are allocated within aligned 128-blocks of Unicode
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* code points. Lexical order is preserved if the "previous code point" state
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* is always moved into the middle of such a block.
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*
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* Additionally, "prev" is moved from anywhere in the Unihan and Hangul
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* areas into the middle of those areas.
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*
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* C0 control codes and space are encoded with their US-ASCII bytes.
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* "prev" is reset for C0 controls but not for space.
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*/
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/* initial value for "prev": middle of the ASCII range */
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#define BOCU1_ASCII_PREV 0x40
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/* bounding byte values for differences */
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#define BOCU1_MIN 0x21
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#define BOCU1_MIDDLE 0x90
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#define BOCU1_MAX_LEAD 0xfe
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/* add the L suffix to make computations with BOCU1_MAX_TRAIL work on 16-bit compilers */
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#define BOCU1_MAX_TRAIL 0xffL
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#define BOCU1_RESET 0xff
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/* number of lead bytes */
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#define BOCU1_COUNT (BOCU1_MAX_LEAD-BOCU1_MIN+1)
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/* adjust trail byte counts for the use of some C0 control byte values */
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#define BOCU1_TRAIL_CONTROLS_COUNT 20
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#define BOCU1_TRAIL_BYTE_OFFSET (BOCU1_MIN-BOCU1_TRAIL_CONTROLS_COUNT)
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/* number of trail bytes */
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#define BOCU1_TRAIL_COUNT ((BOCU1_MAX_TRAIL-BOCU1_MIN+1)+BOCU1_TRAIL_CONTROLS_COUNT)
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/*
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* number of positive and negative single-byte codes
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* (counting 0==BOCU1_MIDDLE among the positive ones)
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*/
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#define BOCU1_SINGLE 64
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/* number of lead bytes for positive and negative 2/3/4-byte sequences */
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#define BOCU1_LEAD_2 43
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#define BOCU1_LEAD_3 3
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#define BOCU1_LEAD_4 1
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/* The difference value range for single-byters. */
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#define BOCU1_REACH_POS_1 (BOCU1_SINGLE-1)
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#define BOCU1_REACH_NEG_1 (-BOCU1_SINGLE)
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/* The difference value range for double-byters. */
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#define BOCU1_REACH_POS_2 (BOCU1_REACH_POS_1+BOCU1_LEAD_2*BOCU1_TRAIL_COUNT)
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#define BOCU1_REACH_NEG_2 (BOCU1_REACH_NEG_1-BOCU1_LEAD_2*BOCU1_TRAIL_COUNT)
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/* The difference value range for 3-byters. */
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#define BOCU1_REACH_POS_3 \
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(BOCU1_REACH_POS_2+BOCU1_LEAD_3*BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT)
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#define BOCU1_REACH_NEG_3 (BOCU1_REACH_NEG_2-BOCU1_LEAD_3*BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT)
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/* The lead byte start values. */
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#define BOCU1_START_POS_2 (BOCU1_MIDDLE+BOCU1_REACH_POS_1+1)
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#define BOCU1_START_POS_3 (BOCU1_START_POS_2+BOCU1_LEAD_2)
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#define BOCU1_START_POS_4 (BOCU1_START_POS_3+BOCU1_LEAD_3)
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/* ==BOCU1_MAX_LEAD */
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#define BOCU1_START_NEG_2 (BOCU1_MIDDLE+BOCU1_REACH_NEG_1)
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#define BOCU1_START_NEG_3 (BOCU1_START_NEG_2-BOCU1_LEAD_2)
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#define BOCU1_START_NEG_4 (BOCU1_START_NEG_3-BOCU1_LEAD_3)
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/* ==BOCU1_MIN+1 */
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/* The length of a byte sequence, according to the lead byte (!=BOCU1_RESET). */
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#define BOCU1_LENGTH_FROM_LEAD(lead) \
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((BOCU1_START_NEG_2<=(lead) && (lead)<BOCU1_START_POS_2) ? 1 : \
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(BOCU1_START_NEG_3<=(lead) && (lead)<BOCU1_START_POS_3) ? 2 : \
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(BOCU1_START_NEG_4<=(lead) && (lead)<BOCU1_START_POS_4) ? 3 : 4)
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/* The length of a byte sequence, according to its packed form. */
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#define BOCU1_LENGTH_FROM_PACKED(packed) \
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((uint32_t)(packed)<0x04000000 ? (packed)>>24 : 4)
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/*
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* 12 commonly used C0 control codes (and space) are only used to encode
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* themselves directly,
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* which makes BOCU-1 MIME-usable and reasonably safe for
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* ASCII-oriented software.
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*
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* These controls are
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* 0 NUL
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*
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* 7 BEL
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* 8 BS
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*
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* 9 TAB
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* a LF
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* b VT
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* c FF
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* d CR
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*
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* e SO
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* f SI
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*
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* 1a SUB
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* 1b ESC
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*
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* The other 20 C0 controls are also encoded directly (to preserve order)
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* but are also used as trail bytes in difference encoding
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* (for better compression).
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*/
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#define BOCU1_TRAIL_TO_BYTE(t) ((t)>=BOCU1_TRAIL_CONTROLS_COUNT ? (t)+BOCU1_TRAIL_BYTE_OFFSET : bocu1TrailToByte[t])
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/*
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* Byte value map for control codes,
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* from external byte values 0x00..0x20
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* to trail byte values 0..19 (0..0x13) as used in the difference calculation.
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* External byte values that are illegal as trail bytes are mapped to -1.
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*/
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static int8_t
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bocu1ByteToTrail[BOCU1_MIN]={
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/* 0 1 2 3 4 5 6 7 */
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-1, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, -1,
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/* 8 9 a b c d e f */
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-1, -1, -1, -1, -1, -1, -1, -1,
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/* 10 11 12 13 14 15 16 17 */
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0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
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/* 18 19 1a 1b 1c 1d 1e 1f */
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0x0e, 0x0f, -1, -1, 0x10, 0x11, 0x12, 0x13,
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/* 20 */
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-1
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};
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/*
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* Byte value map for control codes,
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* from trail byte values 0..19 (0..0x13) as used in the difference calculation
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* to external byte values 0x00..0x20.
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*/
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static int8_t
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bocu1TrailToByte[BOCU1_TRAIL_CONTROLS_COUNT]={
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/* 0 1 2 3 4 5 6 7 */
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0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x10, 0x11,
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/* 8 9 a b c d e f */
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0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
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/* 10 11 12 13 */
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0x1c, 0x1d, 0x1e, 0x1f
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};
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/**
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* Integer division and modulo with negative numerators
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* yields negative modulo results and quotients that are one more than
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* what we need here.
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* This macro adjust the results so that the modulo-value m is always >=0.
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*
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* For positive n, the if() condition is always FALSE.
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*
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* @param n Number to be split into quotient and rest.
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* Will be modified to contain the quotient.
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* @param d Divisor.
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* @param m Output variable for the rest (modulo result).
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*/
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#define NEGDIVMOD(n, d, m) { \
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(m)=(n)%(d); \
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(n)/=(d); \
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if((m)<0) { \
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--(n); \
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(m)+=(d); \
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} \
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}
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/* State for BOCU-1 decoder function. */
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struct Bocu1Rx {
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int32_t prev, count, diff;
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};
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typedef struct Bocu1Rx Bocu1Rx;
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/* Function prototypes ------------------------------------------------------ */
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/* see bocu1.c */
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U_CFUNC int32_t
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packDiff(int32_t diff);
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U_CFUNC int32_t
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encodeBocu1(int32_t *pPrev, int32_t c);
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U_CFUNC int32_t
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decodeBocu1(Bocu1Rx *pRx, uint8_t b);
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/* icuhtml/design/conversion/bocu1/bocu1.c ---------------------------------- */
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/* BOCU-1 implementation functions ------------------------------------------ */
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/**
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* Compute the next "previous" value for differencing
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* from the current code point.
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*
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* @param c current code point, 0..0x10ffff
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* @return "previous code point" state value
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*/
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static U_INLINE int32_t
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bocu1Prev(int32_t c) {
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/* compute new prev */
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if(0x3040<=c && c<=0x309f) {
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/* Hiragana is not 128-aligned */
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return 0x3070;
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} else if(0x4e00<=c && c<=0x9fa5) {
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/* CJK Unihan */
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return 0x4e00-BOCU1_REACH_NEG_2;
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} else if(0xac00<=c && c<=0xd7a3) {
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/* Korean Hangul (cast to int32_t to avoid wraparound on 16-bit compilers) */
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return ((int32_t)0xd7a3+(int32_t)0xac00)/2;
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} else {
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/* mostly small scripts */
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return (c&~0x7f)+BOCU1_ASCII_PREV;
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}
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}
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/**
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* Encode a difference -0x10ffff..0x10ffff in 1..4 bytes
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* and return a packed integer with them.
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*
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* The encoding favors small absolut differences with short encodings
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* to compress runs of same-script characters.
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*
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* @param diff difference value -0x10ffff..0x10ffff
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* @return
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* 0x010000zz for 1-byte sequence zz
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* 0x0200yyzz for 2-byte sequence yy zz
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* 0x03xxyyzz for 3-byte sequence xx yy zz
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* 0xwwxxyyzz for 4-byte sequence ww xx yy zz (ww>0x03)
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*/
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U_CFUNC int32_t
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packDiff(int32_t diff) {
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int32_t result, m, lead, count, shift;
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if(diff>=BOCU1_REACH_NEG_1) {
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/* mostly positive differences, and single-byte negative ones */
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if(diff<=BOCU1_REACH_POS_1) {
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/* single byte */
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return 0x01000000|(BOCU1_MIDDLE+diff);
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} else if(diff<=BOCU1_REACH_POS_2) {
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/* two bytes */
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diff-=BOCU1_REACH_POS_1+1;
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lead=BOCU1_START_POS_2;
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count=1;
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} else if(diff<=BOCU1_REACH_POS_3) {
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/* three bytes */
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diff-=BOCU1_REACH_POS_2+1;
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lead=BOCU1_START_POS_3;
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count=2;
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} else {
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/* four bytes */
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diff-=BOCU1_REACH_POS_3+1;
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lead=BOCU1_START_POS_4;
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count=3;
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}
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} else {
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/* two- and four-byte negative differences */
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if(diff>=BOCU1_REACH_NEG_2) {
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/* two bytes */
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diff-=BOCU1_REACH_NEG_1;
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lead=BOCU1_START_NEG_2;
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count=1;
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} else if(diff>=BOCU1_REACH_NEG_3) {
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/* three bytes */
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diff-=BOCU1_REACH_NEG_2;
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lead=BOCU1_START_NEG_3;
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count=2;
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} else {
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/* four bytes */
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diff-=BOCU1_REACH_NEG_3;
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lead=BOCU1_START_NEG_4;
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count=3;
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}
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}
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/* encode the length of the packed result */
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if(count<3) {
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result=(count+1)<<24;
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} else /* count==3, MSB used for the lead byte */ {
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result=0;
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}
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/* calculate trail bytes like digits in itoa() */
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shift=0;
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do {
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NEGDIVMOD(diff, BOCU1_TRAIL_COUNT, m);
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result|=BOCU1_TRAIL_TO_BYTE(m)<<shift;
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shift+=8;
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} while(--count>0);
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/* add lead byte */
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result|=(lead+diff)<<shift;
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return result;
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}
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/**
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* BOCU-1 encoder function.
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*
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* @param pPrev pointer to the integer that holds
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* the "previous code point" state;
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* the initial value should be 0 which
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* encodeBocu1 will set to the actual BOCU-1 initial state value
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* @param c the code point to encode
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* @return the packed 1/2/3/4-byte encoding, see packDiff(),
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* or 0 if an error occurs
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*
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* @see packDiff
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*/
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U_CFUNC int32_t
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encodeBocu1(int32_t *pPrev, int32_t c) {
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int32_t prev;
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if(pPrev==NULL || c<0 || c>0x10ffff) {
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/* illegal argument */
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return 0;
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}
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prev=*pPrev;
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if(prev==0) {
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/* lenient handling of initial value 0 */
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prev=*pPrev=BOCU1_ASCII_PREV;
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}
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if(c<=0x20) {
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/*
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* ISO C0 control & space:
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* Encode directly for MIME compatibility,
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* and reset state except for space, to not disrupt compression.
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*/
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if(c!=0x20) {
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*pPrev=BOCU1_ASCII_PREV;
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}
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return 0x01000000|c;
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}
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/*
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* all other Unicode code points c==U+0021..U+10ffff
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* are encoded with the difference c-prev
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*
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* a new prev is computed from c,
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* placed in the middle of a 0x80-block (for most small scripts) or
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* in the middle of the Unihan and Hangul blocks
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* to statistically minimize the following difference
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*/
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*pPrev=bocu1Prev(c);
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return packDiff(c-prev);
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}
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/**
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* Function for BOCU-1 decoder; handles multi-byte lead bytes.
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*
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* @param pRx pointer to the decoder state structure
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* @param b lead byte;
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* BOCU1_MIN<=b<BOCU1_START_NEG_2 or BOCU1_START_POS_2<=b<=BOCU1_MAX_LEAD
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* @return -1 (state change only)
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*
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* @see decodeBocu1
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*/
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static int32_t
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decodeBocu1LeadByte(Bocu1Rx *pRx, uint8_t b) {
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int32_t c, count;
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if(b>=BOCU1_START_NEG_2) {
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/* positive difference */
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if(b<BOCU1_START_POS_3) {
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/* two bytes */
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c=((int32_t)b-BOCU1_START_POS_2)*BOCU1_TRAIL_COUNT+BOCU1_REACH_POS_1+1;
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count=1;
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} else if(b<BOCU1_START_POS_4) {
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/* three bytes */
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c=((int32_t)b-BOCU1_START_POS_3)*BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT+BOCU1_REACH_POS_2+1;
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count=2;
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} else {
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/* four bytes */
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c=BOCU1_REACH_POS_3+1;
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count=3;
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}
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} else {
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/* negative difference */
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if(b>=BOCU1_START_NEG_3) {
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/* two bytes */
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c=((int32_t)b-BOCU1_START_NEG_2)*BOCU1_TRAIL_COUNT+BOCU1_REACH_NEG_1;
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count=1;
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} else if(b>BOCU1_MIN) {
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/* three bytes */
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c=((int32_t)b-BOCU1_START_NEG_3)*BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT+BOCU1_REACH_NEG_2;
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count=2;
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} else {
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/* four bytes */
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c=-BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT+BOCU1_REACH_NEG_3;
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count=3;
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}
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}
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/* set the state for decoding the trail byte(s) */
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pRx->diff=c;
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pRx->count=count;
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return -1;
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}
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/**
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* Function for BOCU-1 decoder; handles multi-byte trail bytes.
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*
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* @param pRx pointer to the decoder state structure
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* @param b trail byte
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* @return result value, same as decodeBocu1
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*
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|
* @see decodeBocu1
|
|
*/
|
|
static int32_t
|
|
decodeBocu1TrailByte(Bocu1Rx *pRx, uint8_t b) {
|
|
int32_t t, c, count;
|
|
|
|
if(b<=0x20) {
|
|
/* skip some C0 controls and make the trail byte range contiguous */
|
|
t=bocu1ByteToTrail[b];
|
|
if(t<0) {
|
|
/* illegal trail byte value */
|
|
pRx->prev=BOCU1_ASCII_PREV;
|
|
pRx->count=0;
|
|
return -99;
|
|
}
|
|
#if BOCU1_MAX_TRAIL<0xff
|
|
} else if(b>BOCU1_MAX_TRAIL) {
|
|
return -99;
|
|
#endif
|
|
} else {
|
|
t=(int32_t)b-BOCU1_TRAIL_BYTE_OFFSET;
|
|
}
|
|
|
|
/* add trail byte into difference and decrement count */
|
|
c=pRx->diff;
|
|
count=pRx->count;
|
|
|
|
if(count==1) {
|
|
/* final trail byte, deliver a code point */
|
|
c=pRx->prev+c+t;
|
|
if(0<=c && c<=0x10ffff) {
|
|
/* valid code point result */
|
|
pRx->prev=bocu1Prev(c);
|
|
pRx->count=0;
|
|
return c;
|
|
} else {
|
|
/* illegal code point result */
|
|
pRx->prev=BOCU1_ASCII_PREV;
|
|
pRx->count=0;
|
|
return -99;
|
|
}
|
|
}
|
|
|
|
/* intermediate trail byte */
|
|
if(count==2) {
|
|
pRx->diff=c+t*BOCU1_TRAIL_COUNT;
|
|
} else /* count==3 */ {
|
|
pRx->diff=c+t*BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT;
|
|
}
|
|
pRx->count=count-1;
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* BOCU-1 decoder function.
|
|
*
|
|
* @param pRx pointer to the decoder state structure;
|
|
* the initial values should be 0 which
|
|
* decodeBocu1 will set to actual initial state values
|
|
* @param b an input byte
|
|
* @return
|
|
* 0..0x10ffff for a result code point
|
|
* -1 if only the state changed without code point output
|
|
* <-1 if an error occurs
|
|
*/
|
|
U_CFUNC int32_t
|
|
decodeBocu1(Bocu1Rx *pRx, uint8_t b) {
|
|
int32_t prev, c, count;
|
|
|
|
if(pRx==NULL) {
|
|
/* illegal argument */
|
|
return -99;
|
|
}
|
|
|
|
prev=pRx->prev;
|
|
if(prev==0) {
|
|
/* lenient handling of initial 0 values */
|
|
prev=pRx->prev=BOCU1_ASCII_PREV;
|
|
count=pRx->count=0;
|
|
} else {
|
|
count=pRx->count;
|
|
}
|
|
|
|
if(count==0) {
|
|
/* byte in lead position */
|
|
if(b<=0x20) {
|
|
/*
|
|
* Direct-encoded C0 control code or space.
|
|
* Reset prev for C0 control codes but not for space.
|
|
*/
|
|
if(b!=0x20) {
|
|
pRx->prev=BOCU1_ASCII_PREV;
|
|
}
|
|
return b;
|
|
}
|
|
|
|
/*
|
|
* b is a difference lead byte.
|
|
*
|
|
* Return a code point directly from a single-byte difference.
|
|
*
|
|
* For multi-byte difference lead bytes, set the decoder state
|
|
* with the partial difference value from the lead byte and
|
|
* with the number of trail bytes.
|
|
*
|
|
* For four-byte differences, the signedness also affects the
|
|
* first trail byte, which has special handling farther below.
|
|
*/
|
|
if(b>=BOCU1_START_NEG_2 && b<BOCU1_START_POS_2) {
|
|
/* single-byte difference */
|
|
c=prev+((int32_t)b-BOCU1_MIDDLE);
|
|
pRx->prev=bocu1Prev(c);
|
|
return c;
|
|
} else if(b==BOCU1_RESET) {
|
|
/* only reset the state, no code point */
|
|
pRx->prev=BOCU1_ASCII_PREV;
|
|
return -1;
|
|
} else {
|
|
return decodeBocu1LeadByte(pRx, b);
|
|
}
|
|
} else {
|
|
/* trail byte in any position */
|
|
return decodeBocu1TrailByte(pRx, b);
|
|
}
|
|
}
|
|
|
|
/* icuhtml/design/conversion/bocu1/bocu1tst.c ------------------------------- */
|
|
|
|
/* test code ---------------------------------------------------------------- */
|
|
|
|
/* test code options */
|
|
|
|
/* ignore comma when processing name lists in testText() */
|
|
#define TEST_IGNORE_COMMA 1
|
|
|
|
/**
|
|
* Write a packed BOCU-1 byte sequence into a byte array,
|
|
* without overflow check.
|
|
* Test function.
|
|
*
|
|
* @param packed packed BOCU-1 byte sequence, see packDiff()
|
|
* @param p pointer to byte array
|
|
* @return number of bytes
|
|
*
|
|
* @see packDiff
|
|
*/
|
|
static int32_t
|
|
writePacked(int32_t packed, uint8_t *p) {
|
|
int32_t count=BOCU1_LENGTH_FROM_PACKED(packed);
|
|
switch(count) {
|
|
case 4:
|
|
*p++=(uint8_t)(packed>>24);
|
|
case 3:
|
|
*p++=(uint8_t)(packed>>16);
|
|
case 2:
|
|
*p++=(uint8_t)(packed>>8);
|
|
case 1:
|
|
*p++=(uint8_t)packed;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* Unpack a packed BOCU-1 non-C0/space byte sequence and get
|
|
* the difference to initialPrev.
|
|
* Used only for round-trip testing of the difference encoding and decoding.
|
|
* Test function.
|
|
*
|
|
* @param initialPrev bogus "previous code point" value to make sure that
|
|
* the resulting code point is in the range 0..0x10ffff
|
|
* @param packed packed BOCU-1 byte sequence
|
|
* @return the difference to initialPrev
|
|
*
|
|
* @see packDiff
|
|
* @see writeDiff
|
|
*/
|
|
static int32_t
|
|
unpackDiff(int32_t initialPrev, int32_t packed) {
|
|
Bocu1Rx rx={ 0, 0, 0 };
|
|
int32_t count;
|
|
|
|
rx.prev=initialPrev;
|
|
count=BOCU1_LENGTH_FROM_PACKED(packed);
|
|
switch(count) {
|
|
case 4:
|
|
decodeBocu1(&rx, (uint8_t)(packed>>24));
|
|
case 3:
|
|
decodeBocu1(&rx, (uint8_t)(packed>>16));
|
|
case 2:
|
|
decodeBocu1(&rx, (uint8_t)(packed>>8));
|
|
case 1:
|
|
/* subtract initial prev */
|
|
return decodeBocu1(&rx, (uint8_t)packed)-initialPrev;
|
|
default:
|
|
return -0x7fffffff;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Encode one difference value -0x10ffff..+0x10ffff in 1..4 bytes,
|
|
* preserving lexical order.
|
|
* Also checks for roundtripping of the difference encoding.
|
|
* Test function.
|
|
*
|
|
* @param diff difference value to test, -0x10ffff..0x10ffff
|
|
* @param p pointer to output byte array
|
|
* @return p advanced by number of bytes output
|
|
*
|
|
* @see unpackDiff
|
|
*/
|
|
static uint8_t *
|
|
writeDiff(int32_t diff, uint8_t *p) {
|
|
/* generate the difference as a packed value and serialize it */
|
|
int32_t packed, initialPrev;
|
|
|
|
packed=packDiff(diff);
|
|
|
|
/*
|
|
* bogus initial "prev" to work around
|
|
* code point range check in decodeBocu1()
|
|
*/
|
|
if(diff<=0) {
|
|
initialPrev=0x10ffff;
|
|
} else {
|
|
initialPrev=-1;
|
|
}
|
|
|
|
if(diff!=unpackDiff(initialPrev, packed)) {
|
|
log_err("error: unpackDiff(packDiff(diff=%ld)=0x%08lx)=%ld!=diff\n",
|
|
diff, packed, unpackDiff(initialPrev, packed));
|
|
}
|
|
return p+writePacked(packed, p);
|
|
}
|
|
|
|
/**
|
|
* Encode a UTF-16 string in BOCU-1.
|
|
* Does not check for overflows, but otherwise useful function.
|
|
*
|
|
* @param s input UTF-16 string
|
|
* @param length number of UChar code units in s
|
|
* @param p pointer to output byte array
|
|
* @return number of bytes output
|
|
*/
|
|
static int32_t
|
|
writeString(const UChar *s, int32_t length, uint8_t *p) {
|
|
uint8_t *p0;
|
|
int32_t c, prev, i;
|
|
|
|
prev=0;
|
|
p0=p;
|
|
i=0;
|
|
while(i<length) {
|
|
UTF_NEXT_CHAR(s, i, length, c);
|
|
p+=writePacked(encodeBocu1(&prev, c), p);
|
|
}
|
|
return p-p0;
|
|
}
|
|
|
|
/**
|
|
* Decode a BOCU-1 byte sequence to a UTF-16 string.
|
|
* Does not check for overflows, but otherwise useful function.
|
|
*
|
|
* @param p pointer to input BOCU-1 bytes
|
|
* @param length number of input bytes
|
|
* @param s point to output UTF-16 string array
|
|
* @return number of UChar code units output
|
|
*/
|
|
static int32_t
|
|
readString(const uint8_t *p, int32_t length, UChar *s) {
|
|
Bocu1Rx rx={ 0, 0, 0 };
|
|
int32_t c, i, sLength;
|
|
|
|
i=sLength=0;
|
|
while(i<length) {
|
|
c=decodeBocu1(&rx, p[i++]);
|
|
if(c<-1) {
|
|
log_err("error: readString detects encoding error at string index %ld\n", i);
|
|
return -1;
|
|
}
|
|
if(c>=0) {
|
|
UTF_APPEND_CHAR_UNSAFE(s, sLength, c);
|
|
}
|
|
}
|
|
return sLength;
|
|
}
|
|
|
|
static U_INLINE char
|
|
hexDigit(uint8_t digit) {
|
|
return digit<=9 ? (char)('0'+digit) : (char)('a'-10+digit);
|
|
}
|
|
|
|
/**
|
|
* Pretty-print 0-terminated byte values.
|
|
* Helper function for test output.
|
|
*
|
|
* @param bytes 0-terminated byte array to print
|
|
*/
|
|
static void
|
|
printBytes(uint8_t *bytes, char *out) {
|
|
int i;
|
|
uint8_t b;
|
|
|
|
i=0;
|
|
while((b=*bytes++)!=0) {
|
|
*out++=' ';
|
|
*out++=hexDigit((uint8_t)(b>>4));
|
|
*out++=hexDigit((uint8_t)(b&0xf));
|
|
++i;
|
|
}
|
|
i=3*(5-i);
|
|
while(i>0) {
|
|
*out++=' ';
|
|
--i;
|
|
}
|
|
*out=0;
|
|
}
|
|
|
|
/**
|
|
* Basic BOCU-1 test function, called when there are no command line arguments.
|
|
* Prints some of the #define values and performs round-trip tests of the
|
|
* difference encoding and decoding.
|
|
*/
|
|
static void
|
|
TestBOCU1RefDiff(void) {
|
|
char buf1[80], buf2[80];
|
|
uint8_t prev[5], level[5];
|
|
int32_t i, cmp, countErrors;
|
|
|
|
log_verbose("reach of single bytes: %ld\n", 1+BOCU1_REACH_POS_1-BOCU1_REACH_NEG_1);
|
|
log_verbose("reach of 2 bytes : %ld\n", 1+BOCU1_REACH_POS_2-BOCU1_REACH_NEG_2);
|
|
log_verbose("reach of 3 bytes : %ld\n\n", 1+BOCU1_REACH_POS_3-BOCU1_REACH_NEG_3);
|
|
|
|
log_verbose(" BOCU1_REACH_NEG_1 %8ld BOCU1_REACH_POS_1 %8ld\n", BOCU1_REACH_NEG_1, BOCU1_REACH_POS_1);
|
|
log_verbose(" BOCU1_REACH_NEG_2 %8ld BOCU1_REACH_POS_2 %8ld\n", BOCU1_REACH_NEG_2, BOCU1_REACH_POS_2);
|
|
log_verbose(" BOCU1_REACH_NEG_3 %8ld BOCU1_REACH_POS_3 %8ld\n\n", BOCU1_REACH_NEG_3, BOCU1_REACH_POS_3);
|
|
|
|
log_verbose(" BOCU1_MIDDLE 0x%02x\n", BOCU1_MIDDLE);
|
|
log_verbose(" BOCU1_START_NEG_2 0x%02x BOCU1_START_POS_2 0x%02x\n", BOCU1_START_NEG_2, BOCU1_START_POS_2);
|
|
log_verbose(" BOCU1_START_NEG_3 0x%02x BOCU1_START_POS_3 0x%02x\n\n", BOCU1_START_NEG_3, BOCU1_START_POS_3);
|
|
|
|
/* test packDiff() & unpackDiff() with some specific values */
|
|
writeDiff(0, level);
|
|
writeDiff(1, level);
|
|
writeDiff(65, level);
|
|
writeDiff(130, level);
|
|
writeDiff(30000, level);
|
|
writeDiff(1000000, level);
|
|
writeDiff(-65, level);
|
|
writeDiff(-130, level);
|
|
writeDiff(-30000, level);
|
|
writeDiff(-1000000, level);
|
|
|
|
/* test that each value is smaller than any following one */
|
|
countErrors=0;
|
|
i=-0x10ffff;
|
|
*writeDiff(i, prev)=0;
|
|
|
|
/* show first number and bytes */
|
|
printBytes(prev, buf1);
|
|
log_verbose(" wD(%8ld) %s\n", i, buf1);
|
|
|
|
for(++i; i<=0x10ffff; ++i) {
|
|
*writeDiff(i, level)=0;
|
|
cmp=strcmp((const char *)prev, (const char *)level);
|
|
if(BOCU1_LENGTH_FROM_LEAD(level[0])!=(int32_t)strlen((const char *)level)) {
|
|
log_verbose("BOCU1_LENGTH_FROM_LEAD(0x%02x)=%ld!=%ld=strlen(writeDiff(%ld))\n",
|
|
level[0], BOCU1_LENGTH_FROM_LEAD(level[0]), strlen((const char *)level), i);
|
|
}
|
|
if(cmp<0) {
|
|
if(i==0 || i==1 || strlen((const char *)prev)!=strlen((const char *)level)) {
|
|
/*
|
|
* if the result is good, then print only if the length changed
|
|
* to get little but interesting output
|
|
*/
|
|
printBytes(prev, buf1);
|
|
printBytes(level, buf2);
|
|
log_verbose("ok: strcmp(wD(%8ld), wD(%8ld))=%2d %s%s\n", i-1, i, cmp, buf1, buf2);
|
|
}
|
|
} else {
|
|
++countErrors;
|
|
printBytes(prev, buf1);
|
|
printBytes(level, buf2);
|
|
log_verbose("wrong: strcmp(wD(%8ld), wD(%8ld))=%2d %s%s\n", i-1, i, cmp, buf1, buf2);
|
|
}
|
|
/* remember the previous bytes */
|
|
memcpy(prev, level, 4);
|
|
}
|
|
|
|
/* show last number and bytes */
|
|
printBytes((uint8_t *)"", buf1);
|
|
printBytes(prev, buf2);
|
|
log_verbose(" wD(%8ld) %s%s\n", i-1, buf1, buf2);
|
|
|
|
if(countErrors==0) {
|
|
log_verbose("writeDiff(-0x10ffff..0x10ffff) works fine\n");
|
|
} else {
|
|
log_err("writeDiff(-0x10ffff..0x10ffff) violates lexical ordering in %d cases\n", countErrors);
|
|
}
|
|
|
|
/* output signature byte sequence */
|
|
i=0;
|
|
writePacked(encodeBocu1(&i, 0xfeff), level);
|
|
log_verbose("\nBOCU-1 signature byte sequence: %02x %02x %02x\n",
|
|
level[0], level[1], level[2]);
|
|
}
|
|
|
|
/* cintltst code ------------------------------------------------------------ */
|
|
|
|
/* test one string with the ICU and the reference BOCU-1 implementations */
|
|
static void
|
|
roundtripBOCU1(UConverter *bocu1, int32_t number, const UChar *text, int32_t length) {
|
|
static UChar roundtripRef[30000], roundtripICU[30000];
|
|
static char bocu1Ref[30000], bocu1ICU[30000];
|
|
|
|
int32_t bocu1RefLength, bocu1ICULength, roundtripRefLength, roundtripICULength;
|
|
UErrorCode errorCode;
|
|
|
|
/* Unicode -> BOCU-1 */
|
|
bocu1RefLength=writeString(text, length, (uint8_t *)bocu1Ref);
|
|
|
|
errorCode=U_ZERO_ERROR;
|
|
bocu1ICULength=ucnv_fromUChars(bocu1, bocu1ICU, sizeof(bocu1ICU), text, length, &errorCode);
|
|
if(U_FAILURE(errorCode)) {
|
|
log_err("ucnv_fromUChars(BOCU-1, text(%d)[%d]) failed: %s\n", number, length, u_errorName(errorCode));
|
|
return;
|
|
}
|
|
|
|
if(bocu1RefLength!=bocu1ICULength || 0!=uprv_memcmp(bocu1Ref, bocu1ICU, bocu1RefLength)) {
|
|
log_err("Unicode(%d)[%d] -> BOCU-1: reference[%d]!=ICU[%d]\n", number, length, bocu1RefLength, bocu1ICULength);
|
|
return;
|
|
}
|
|
|
|
/* BOCU-1 -> Unicode */
|
|
roundtripRefLength=readString((uint8_t *)bocu1Ref, bocu1RefLength, roundtripRef);
|
|
if(roundtripRefLength<0) {
|
|
return; /* readString() found an error and reported it */
|
|
}
|
|
|
|
roundtripICULength=ucnv_toUChars(bocu1, roundtripICU, sizeof(roundtripICU)/U_SIZEOF_UCHAR, bocu1ICU, bocu1ICULength, &errorCode);
|
|
if(U_FAILURE(errorCode)) {
|
|
log_err("ucnv_toUChars(BOCU-1, text(%d)[%d]) failed: %s\n", number, length, u_errorName(errorCode));
|
|
return;
|
|
}
|
|
|
|
if(length!=roundtripRefLength || 0!=u_memcmp(text, roundtripRef, length)) {
|
|
log_err("BOCU-1 -> Unicode: original(%d)[%d]!=reference[%d]\n", number, length, roundtripRefLength);
|
|
return;
|
|
}
|
|
if(roundtripRefLength!=roundtripICULength || 0!=u_memcmp(roundtripRef, roundtripICU, roundtripRefLength)) {
|
|
log_err("BOCU-1 -> Unicode: reference(%d)[%d]!=ICU[%d]\n", number, roundtripRefLength, roundtripICULength);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static const UChar feff[]={ 0xfeff };
|
|
static const UChar ascii[]={ 0x61, 0x62, 0x20, 0x63, 0x61 };
|
|
static const UChar crlf[]={ 0xd, 0xa, 0x20 };
|
|
static const UChar nul[]={ 0 };
|
|
static const UChar latin[]={ 0xdf, 0xe6 };
|
|
static const UChar devanagari[]={ 0x930, 0x20, 0x918, 0x909 };
|
|
static const UChar hiragana[]={ 0x3086, 0x304d, 0x20, 0x3053, 0x4000 };
|
|
static const UChar unihan[]={ 0x4e00, 0x7777, 0x20, 0x9fa5, 0x4e00 };
|
|
static const UChar hangul[]={ 0xac00, 0xbcde, 0x20, 0xd7a3 };
|
|
static const UChar surrogates[]={ 0xdc00, 0xd800 }; /* single surrogates, unmatched! */
|
|
static const UChar plane1[]={ 0xd800, 0xdc00 };
|
|
static const UChar plane2[]={ 0xd845, 0xdddd };
|
|
static const UChar plane15[]={ 0xdbbb, 0xddee, 0x20 };
|
|
static const UChar plane16[]={ 0xdbff, 0xdfff };
|
|
static const UChar c0[]={ 1, 0xe40, 0x20, 9 };
|
|
|
|
static const struct {
|
|
const UChar *s;
|
|
int32_t length;
|
|
} strings[]={
|
|
{ feff, LENGTHOF(feff) },
|
|
{ ascii, LENGTHOF(ascii) },
|
|
{ crlf, LENGTHOF(crlf) },
|
|
{ nul, LENGTHOF(nul) },
|
|
{ latin, LENGTHOF(latin) },
|
|
{ devanagari, LENGTHOF(devanagari) },
|
|
{ hiragana, LENGTHOF(hiragana) },
|
|
{ unihan, LENGTHOF(unihan) },
|
|
{ hangul, LENGTHOF(hangul) },
|
|
{ surrogates, LENGTHOF(surrogates) },
|
|
{ plane1, LENGTHOF(plane1) },
|
|
{ plane2, LENGTHOF(plane2) },
|
|
{ plane15, LENGTHOF(plane15) },
|
|
{ plane16, LENGTHOF(plane16) },
|
|
{ c0, LENGTHOF(c0) }
|
|
};
|
|
|
|
/*
|
|
* Verify that the ICU BOCU-1 implementation produces the same results as
|
|
* the reference implementation from the design folder.
|
|
* Generate some texts and convert them with both converters, verifying
|
|
* identical results and roundtripping.
|
|
*/
|
|
static void
|
|
TestBOCU1(void) {
|
|
UChar text[30000];
|
|
int32_t i, length;
|
|
|
|
UConverter *bocu1;
|
|
UErrorCode errorCode;
|
|
|
|
errorCode=U_ZERO_ERROR;
|
|
bocu1=ucnv_open("BOCU-1", &errorCode);
|
|
if(U_FAILURE(errorCode)) {
|
|
log_err("error: unable to open BOCU-1 converter: %s\n", u_errorName(errorCode));
|
|
return;
|
|
}
|
|
|
|
/* text 1: each of strings[] once */
|
|
length=0;
|
|
for(i=0; i<LENGTHOF(strings); ++i) {
|
|
u_memcpy(text+length, strings[i].s, strings[i].length);
|
|
length+=strings[i].length;
|
|
}
|
|
roundtripBOCU1(bocu1, 1, text, length);
|
|
|
|
/* text 2: each of strings[] twice */
|
|
length=0;
|
|
for(i=0; i<LENGTHOF(strings); ++i) {
|
|
u_memcpy(text+length, strings[i].s, strings[i].length);
|
|
length+=strings[i].length;
|
|
u_memcpy(text+length, strings[i].s, strings[i].length);
|
|
length+=strings[i].length;
|
|
}
|
|
roundtripBOCU1(bocu1, 2, text, length);
|
|
|
|
/* text 3: each of strings[] many times (set step vs. |strings| so that all strings are used) */
|
|
length=0;
|
|
for(i=1; length<5000; i+=7) {
|
|
if(i>=LENGTHOF(strings)) {
|
|
i-=LENGTHOF(strings);
|
|
}
|
|
u_memcpy(text+length, strings[i].s, strings[i].length);
|
|
length+=strings[i].length;
|
|
}
|
|
roundtripBOCU1(bocu1, 3, text, length);
|
|
|
|
ucnv_close(bocu1);
|
|
}
|
|
|
|
U_CFUNC void addBOCU1Tests(TestNode** root);
|
|
|
|
U_CFUNC void
|
|
addBOCU1Tests(TestNode** root) {
|
|
addTest(root, TestBOCU1RefDiff, "tsconv/bocu1tst/TestBOCU1RefDiff");
|
|
addTest(root, TestBOCU1, "tsconv/bocu1tst/TestBOCU1");
|
|
}
|