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-/*
-******************************************************************************
-*
-* Copyright (C) 2002-2007, International Business Machines
-* Corporation and others. All Rights Reserved.
-*
-******************************************************************************
-* file name: bocu1tst.c
-* encoding: US-ASCII
-* tab size: 8 (not used)
-* indentation:4
-*
-* created on: 2002may27
-* created by: Markus W. Scherer
-*
-* This is the reference implementation of BOCU-1,
-* the MIME-friendly form of the Binary Ordered Compression for Unicode,
-* taken directly from ### http://source.icu-project.org/repos/icu/icuhtml/trunk/design/conversion/bocu1/
-* The files bocu1.h and bocu1.c from the design folder are taken
-* verbatim (minus copyright and #include) and copied together into this file.
-* The reference code and some of the reference bocu1tst.c
-* is modified to run as part of the ICU cintltst
-* test framework (minus main(), log_ln() etc. instead of printf()).
-*
-* This reference implementation is used here to verify
-* the ICU BOCU-1 implementation, which is
-* adapted for ICU conversion APIs and optimized.
-* ### links in design doc to here and to ucnvbocu.c
-*/
-
-#include "unicode/utypes.h"
-#include "unicode/ustring.h"
-#include "unicode/ucnv.h"
-#include "cmemory.h"
-#include "cintltst.h"
-
-#define LENGTHOF(array) (sizeof(array)/sizeof((array)[0]))
-
-/* icuhtml/design/conversion/bocu1/bocu1.h ---------------------------------- */
-
-/* BOCU-1 constants and macros ---------------------------------------------- */
-
-/*
- * BOCU-1 encodes the code points of a Unicode string as
- * a sequence of byte-encoded differences (slope detection),
- * preserving lexical order.
- *
- * Optimize the difference-taking for runs of Unicode text within
- * small scripts:
- *
- * Most small scripts are allocated within aligned 128-blocks of Unicode
- * code points. Lexical order is preserved if the "previous code point" state
- * is always moved into the middle of such a block.
- *
- * Additionally, "prev" is moved from anywhere in the Unihan and Hangul
- * areas into the middle of those areas.
- *
- * C0 control codes and space are encoded with their US-ASCII bytes.
- * "prev" is reset for C0 controls but not for space.
- */
-
-/* initial value for "prev": middle of the ASCII range */
-#define BOCU1_ASCII_PREV 0x40
-
-/* bounding byte values for differences */
-#define BOCU1_MIN 0x21
-#define BOCU1_MIDDLE 0x90
-#define BOCU1_MAX_LEAD 0xfe
-
-/* add the L suffix to make computations with BOCU1_MAX_TRAIL work on 16-bit compilers */
-#define BOCU1_MAX_TRAIL 0xffL
-#define BOCU1_RESET 0xff
-
-/* number of lead bytes */
-#define BOCU1_COUNT (BOCU1_MAX_LEAD-BOCU1_MIN+1)
-
-/* adjust trail byte counts for the use of some C0 control byte values */
-#define BOCU1_TRAIL_CONTROLS_COUNT 20
-#define BOCU1_TRAIL_BYTE_OFFSET (BOCU1_MIN-BOCU1_TRAIL_CONTROLS_COUNT)
-
-/* number of trail bytes */
-#define BOCU1_TRAIL_COUNT ((BOCU1_MAX_TRAIL-BOCU1_MIN+1)+BOCU1_TRAIL_CONTROLS_COUNT)
-
-/*
- * number of positive and negative single-byte codes
- * (counting 0==BOCU1_MIDDLE among the positive ones)
- */
-#define BOCU1_SINGLE 64
-
-/* number of lead bytes for positive and negative 2/3/4-byte sequences */
-#define BOCU1_LEAD_2 43
-#define BOCU1_LEAD_3 3
-#define BOCU1_LEAD_4 1
-
-/* The difference value range for single-byters. */
-#define BOCU1_REACH_POS_1 (BOCU1_SINGLE-1)
-#define BOCU1_REACH_NEG_1 (-BOCU1_SINGLE)
-
-/* The difference value range for double-byters. */
-#define BOCU1_REACH_POS_2 (BOCU1_REACH_POS_1+BOCU1_LEAD_2*BOCU1_TRAIL_COUNT)
-#define BOCU1_REACH_NEG_2 (BOCU1_REACH_NEG_1-BOCU1_LEAD_2*BOCU1_TRAIL_COUNT)
-
-/* The difference value range for 3-byters. */
-#define BOCU1_REACH_POS_3 \
- (BOCU1_REACH_POS_2+BOCU1_LEAD_3*BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT)
-
-#define BOCU1_REACH_NEG_3 (BOCU1_REACH_NEG_2-BOCU1_LEAD_3*BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT)
-
-/* The lead byte start values. */
-#define BOCU1_START_POS_2 (BOCU1_MIDDLE+BOCU1_REACH_POS_1+1)
-#define BOCU1_START_POS_3 (BOCU1_START_POS_2+BOCU1_LEAD_2)
-#define BOCU1_START_POS_4 (BOCU1_START_POS_3+BOCU1_LEAD_3)
- /* ==BOCU1_MAX_LEAD */
-
-#define BOCU1_START_NEG_2 (BOCU1_MIDDLE+BOCU1_REACH_NEG_1)
-#define BOCU1_START_NEG_3 (BOCU1_START_NEG_2-BOCU1_LEAD_2)
-#define BOCU1_START_NEG_4 (BOCU1_START_NEG_3-BOCU1_LEAD_3)
- /* ==BOCU1_MIN+1 */
-
-/* The length of a byte sequence, according to the lead byte (!=BOCU1_RESET). */
-#define BOCU1_LENGTH_FROM_LEAD(lead) \
- ((BOCU1_START_NEG_2<=(lead) && (lead)<BOCU1_START_POS_2) ? 1 : \
- (BOCU1_START_NEG_3<=(lead) && (lead)<BOCU1_START_POS_3) ? 2 : \
- (BOCU1_START_NEG_4<=(lead) && (lead)<BOCU1_START_POS_4) ? 3 : 4)
-
-/* The length of a byte sequence, according to its packed form. */
-#define BOCU1_LENGTH_FROM_PACKED(packed) \
- ((uint32_t)(packed)<0x04000000 ? (packed)>>24 : 4)
-
-/*
- * 12 commonly used C0 control codes (and space) are only used to encode
- * themselves directly,
- * which makes BOCU-1 MIME-usable and reasonably safe for
- * ASCII-oriented software.
- *
- * These controls are
- * 0 NUL
- *
- * 7 BEL
- * 8 BS
- *
- * 9 TAB
- * a LF
- * b VT
- * c FF
- * d CR
- *
- * e SO
- * f SI
- *
- * 1a SUB
- * 1b ESC
- *
- * The other 20 C0 controls are also encoded directly (to preserve order)
- * but are also used as trail bytes in difference encoding
- * (for better compression).
- */
-#define BOCU1_TRAIL_TO_BYTE(t) ((t)>=BOCU1_TRAIL_CONTROLS_COUNT ? (t)+BOCU1_TRAIL_BYTE_OFFSET : bocu1TrailToByte[t])
-
-/*
- * Byte value map for control codes,
- * from external byte values 0x00..0x20
- * to trail byte values 0..19 (0..0x13) as used in the difference calculation.
- * External byte values that are illegal as trail bytes are mapped to -1.
- */
-static const int8_t
-bocu1ByteToTrail[BOCU1_MIN]={
-/* 0 1 2 3 4 5 6 7 */
- -1, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, -1,
-
-/* 8 9 a b c d e f */
- -1, -1, -1, -1, -1, -1, -1, -1,
-
-/* 10 11 12 13 14 15 16 17 */
- 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
-
-/* 18 19 1a 1b 1c 1d 1e 1f */
- 0x0e, 0x0f, -1, -1, 0x10, 0x11, 0x12, 0x13,
-
-/* 20 */
- -1
-};
-
-/*
- * Byte value map for control codes,
- * from trail byte values 0..19 (0..0x13) as used in the difference calculation
- * to external byte values 0x00..0x20.
- */
-static const int8_t
-bocu1TrailToByte[BOCU1_TRAIL_CONTROLS_COUNT]={
-/* 0 1 2 3 4 5 6 7 */
- 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x10, 0x11,
-
-/* 8 9 a b c d e f */
- 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
-
-/* 10 11 12 13 */
- 0x1c, 0x1d, 0x1e, 0x1f
-};
-
-/**
- * Integer division and modulo with negative numerators
- * yields negative modulo results and quotients that are one more than
- * what we need here.
- * This macro adjust the results so that the modulo-value m is always >=0.
- *
- * For positive n, the if() condition is always FALSE.
- *
- * @param n Number to be split into quotient and rest.
- * Will be modified to contain the quotient.
- * @param d Divisor.
- * @param m Output variable for the rest (modulo result).
- */
-#define NEGDIVMOD(n, d, m) { \
- (m)=(n)%(d); \
- (n)/=(d); \
- if((m)<0) { \
- --(n); \
- (m)+=(d); \
- } \
-}
-
-/* State for BOCU-1 decoder function. */
-struct Bocu1Rx {
- int32_t prev, count, diff;
-};
-
-typedef struct Bocu1Rx Bocu1Rx;
-
-/* Function prototypes ------------------------------------------------------ */
-
-/* see bocu1.c */
-U_CFUNC int32_t
-packDiff(int32_t diff);
-
-U_CFUNC int32_t
-encodeBocu1(int32_t *pPrev, int32_t c);
-
-U_CFUNC int32_t
-decodeBocu1(Bocu1Rx *pRx, uint8_t b);
-
-/* icuhtml/design/conversion/bocu1/bocu1.c ---------------------------------- */
-
-/* BOCU-1 implementation functions ------------------------------------------ */
-
-/**
- * Compute the next "previous" value for differencing
- * from the current code point.
- *
- * @param c current code point, 0..0x10ffff
- * @return "previous code point" state value
- */
-static U_INLINE int32_t
-bocu1Prev(int32_t c) {
- /* compute new prev */
- if(0x3040<=c && c<=0x309f) {
- /* Hiragana is not 128-aligned */
- return 0x3070;
- } else if(0x4e00<=c && c<=0x9fa5) {
- /* CJK Unihan */
- return 0x4e00-BOCU1_REACH_NEG_2;
- } else if(0xac00<=c && c<=0xd7a3) {
- /* Korean Hangul (cast to int32_t to avoid wraparound on 16-bit compilers) */
- return ((int32_t)0xd7a3+(int32_t)0xac00)/2;
- } else {
- /* mostly small scripts */
- return (c&~0x7f)+BOCU1_ASCII_PREV;
- }
-}
-
-/**
- * Encode a difference -0x10ffff..0x10ffff in 1..4 bytes
- * and return a packed integer with them.
- *
- * The encoding favors small absolut differences with short encodings
- * to compress runs of same-script characters.
- *
- * @param diff difference value -0x10ffff..0x10ffff
- * @return
- * 0x010000zz for 1-byte sequence zz
- * 0x0200yyzz for 2-byte sequence yy zz
- * 0x03xxyyzz for 3-byte sequence xx yy zz
- * 0xwwxxyyzz for 4-byte sequence ww xx yy zz (ww>0x03)
- */
-U_CFUNC int32_t
-packDiff(int32_t diff) {
- int32_t result, m, lead, count, shift;
-
- if(diff>=BOCU1_REACH_NEG_1) {
- /* mostly positive differences, and single-byte negative ones */
- if(diff<=BOCU1_REACH_POS_1) {
- /* single byte */
- return 0x01000000|(BOCU1_MIDDLE+diff);
- } else if(diff<=BOCU1_REACH_POS_2) {
- /* two bytes */
- diff-=BOCU1_REACH_POS_1+1;
- lead=BOCU1_START_POS_2;
- count=1;
- } else if(diff<=BOCU1_REACH_POS_3) {
- /* three bytes */
- diff-=BOCU1_REACH_POS_2+1;
- lead=BOCU1_START_POS_3;
- count=2;
- } else {
- /* four bytes */
- diff-=BOCU1_REACH_POS_3+1;
- lead=BOCU1_START_POS_4;
- count=3;
- }
- } else {
- /* two- and four-byte negative differences */
- if(diff>=BOCU1_REACH_NEG_2) {
- /* two bytes */
- diff-=BOCU1_REACH_NEG_1;
- lead=BOCU1_START_NEG_2;
- count=1;
- } else if(diff>=BOCU1_REACH_NEG_3) {
- /* three bytes */
- diff-=BOCU1_REACH_NEG_2;
- lead=BOCU1_START_NEG_3;
- count=2;
- } else {
- /* four bytes */
- diff-=BOCU1_REACH_NEG_3;
- lead=BOCU1_START_NEG_4;
- count=3;
- }
- }
-
- /* encode the length of the packed result */
- if(count<3) {
- result=(count+1)<<24;
- } else /* count==3, MSB used for the lead byte */ {
- result=0;
- }
-
- /* calculate trail bytes like digits in itoa() */
- shift=0;
- do {
- NEGDIVMOD(diff, BOCU1_TRAIL_COUNT, m);
- result|=BOCU1_TRAIL_TO_BYTE(m)<<shift;
- shift+=8;
- } while(--count>0);
-
- /* add lead byte */
- result|=(lead+diff)<<shift;
-
- return result;
-}
-
-/**
- * BOCU-1 encoder function.
- *
- * @param pPrev pointer to the integer that holds
- * the "previous code point" state;
- * the initial value should be 0 which
- * encodeBocu1 will set to the actual BOCU-1 initial state value
- * @param c the code point to encode
- * @return the packed 1/2/3/4-byte encoding, see packDiff(),
- * or 0 if an error occurs
- *
- * @see packDiff
- */
-U_CFUNC int32_t
-encodeBocu1(int32_t *pPrev, int32_t c) {
- int32_t prev;
-
- if(pPrev==NULL || c<0 || c>0x10ffff) {
- /* illegal argument */
- return 0;
- }
-
- prev=*pPrev;
- if(prev==0) {
- /* lenient handling of initial value 0 */
- prev=*pPrev=BOCU1_ASCII_PREV;
- }
-
- if(c<=0x20) {
- /*
- * ISO C0 control & space:
- * Encode directly for MIME compatibility,
- * and reset state except for space, to not disrupt compression.
- */
- if(c!=0x20) {
- *pPrev=BOCU1_ASCII_PREV;
- }
- return 0x01000000|c;
- }
-
- /*
- * all other Unicode code points c==U+0021..U+10ffff
- * are encoded with the difference c-prev
- *
- * a new prev is computed from c,
- * placed in the middle of a 0x80-block (for most small scripts) or
- * in the middle of the Unihan and Hangul blocks
- * to statistically minimize the following difference
- */
- *pPrev=bocu1Prev(c);
- return packDiff(c-prev);
-}
-
-/**
- * Function for BOCU-1 decoder; handles multi-byte lead bytes.
- *
- * @param pRx pointer to the decoder state structure
- * @param b lead byte;
- * BOCU1_MIN<=b<BOCU1_START_NEG_2 or BOCU1_START_POS_2<=b<=BOCU1_MAX_LEAD
- * @return -1 (state change only)
- *
- * @see decodeBocu1
- */
-static int32_t
-decodeBocu1LeadByte(Bocu1Rx *pRx, uint8_t b) {
- int32_t c, count;
-
- if(b>=BOCU1_START_NEG_2) {
- /* positive difference */
- if(b<BOCU1_START_POS_3) {
- /* two bytes */
- c=((int32_t)b-BOCU1_START_POS_2)*BOCU1_TRAIL_COUNT+BOCU1_REACH_POS_1+1;
- count=1;
- } else if(b<BOCU1_START_POS_4) {
- /* three bytes */
- c=((int32_t)b-BOCU1_START_POS_3)*BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT+BOCU1_REACH_POS_2+1;
- count=2;
- } else {
- /* four bytes */
- c=BOCU1_REACH_POS_3+1;
- count=3;
- }
- } else {
- /* negative difference */
- if(b>=BOCU1_START_NEG_3) {
- /* two bytes */
- c=((int32_t)b-BOCU1_START_NEG_2)*BOCU1_TRAIL_COUNT+BOCU1_REACH_NEG_1;
- count=1;
- } else if(b>BOCU1_MIN) {
- /* three bytes */
- c=((int32_t)b-BOCU1_START_NEG_3)*BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT+BOCU1_REACH_NEG_2;
- count=2;
- } else {
- /* four bytes */
- c=-BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT*BOCU1_TRAIL_COUNT+BOCU1_REACH_NEG_3;
- count=3;
- }
- }
-
- /* set the state for decoding the trail byte(s) */
- pRx->diff=c;
- pRx->count=count;
- return -1;
-}
-
-/**
- * Function for BOCU-1 decoder; handles multi-byte trail bytes.
- *
- * @param pRx pointer to the decoder state structure
- * @param b trail byte
- * @return result value, same as decodeBocu1
- *
- * @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 (int32_t)(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 ------------------------------------------------------------ */
-
-static const int32_t DEFAULT_BUFFER_SIZE = 30000;
-
-
-/* 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) {
- UChar *roundtripRef, *roundtripICU;
- char *bocu1Ref, *bocu1ICU;
-
- int32_t bocu1RefLength, bocu1ICULength, roundtripRefLength, roundtripICULength;
- UErrorCode errorCode;
-
- roundtripRef = malloc(DEFAULT_BUFFER_SIZE * sizeof(UChar));
- roundtripICU = malloc(DEFAULT_BUFFER_SIZE * sizeof(UChar));
- bocu1Ref = malloc(DEFAULT_BUFFER_SIZE);
- bocu1ICU = malloc(DEFAULT_BUFFER_SIZE);
-
- /* Unicode -> BOCU-1 */
- bocu1RefLength=writeString(text, length, (uint8_t *)bocu1Ref);
-
- errorCode=U_ZERO_ERROR;
- bocu1ICULength=ucnv_fromUChars(bocu1, bocu1ICU, DEFAULT_BUFFER_SIZE, 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, DEFAULT_BUFFER_SIZE, 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;
- }
- free(roundtripRef);
- free(roundtripICU);
- free(bocu1Ref);
- free(bocu1ICU);
-}
-
-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;
- 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 = malloc(DEFAULT_BUFFER_SIZE * sizeof(UChar));
-
- /* 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);
- free(text);
-}
-
-U_CFUNC void addBOCU1Tests(TestNode** root);
-
-U_CFUNC void
-addBOCU1Tests(TestNode** root) {
- addTest(root, TestBOCU1RefDiff, "tsconv/bocu1tst/TestBOCU1RefDiff");
- addTest(root, TestBOCU1, "tsconv/bocu1tst/TestBOCU1");
-}