diff options
Diffstat (limited to 'deps/icu-small/source/tools/toolutil/ucmstate.c')
| -rw-r--r-- | deps/icu-small/source/tools/toolutil/ucmstate.c | 1046 |
1 files changed, 1046 insertions, 0 deletions
diff --git a/deps/icu-small/source/tools/toolutil/ucmstate.c b/deps/icu-small/source/tools/toolutil/ucmstate.c new file mode 100644 index 0000000000..6152ca9463 --- /dev/null +++ b/deps/icu-small/source/tools/toolutil/ucmstate.c @@ -0,0 +1,1046 @@ +/* +******************************************************************************* +* +* Copyright (C) 2003-2012, International Business Machines +* Corporation and others. All Rights Reserved. +* +******************************************************************************* +* file name: ucmstate.c +* encoding: US-ASCII +* tab size: 8 (not used) +* indentation:4 +* +* created on: 2003oct09 +* created by: Markus W. Scherer +* +* This file handles ICU .ucm file state information as part of the ucm module. +* Most of this code used to be in makeconv.c. +*/ + +#include "unicode/utypes.h" +#include "cstring.h" +#include "cmemory.h" +#include "uarrsort.h" +#include "ucnvmbcs.h" +#include "ucnv_ext.h" +#include "uparse.h" +#include "ucm.h" +#include <stdio.h> + +#if !UCONFIG_NO_CONVERSION + +/* MBCS state handling ------------------------------------------------------ */ + +/* + * state table row grammar (ebnf-style): + * (whitespace is allowed between all tokens) + * + * row=[[firstentry ','] entry (',' entry)*] + * firstentry="initial" | "surrogates" + * (initial state (default for state 0), output is all surrogate pairs) + * entry=range [':' nextstate] ['.' action] + * range=number ['-' number] + * nextstate=number + * (0..7f) + * action='u' | 's' | 'p' | 'i' + * (unassigned, state change only, surrogate pair, illegal) + * number=(1- or 2-digit hexadecimal number) + */ +static const char * +parseState(const char *s, int32_t state[256], uint32_t *pFlags) { + const char *t; + uint32_t start, end, i; + int32_t entry; + + /* initialize the state: all illegal with U+ffff */ + for(i=0; i<256; ++i) { + state[i]=MBCS_ENTRY_FINAL(0, MBCS_STATE_ILLEGAL, 0xffff); + } + + /* skip leading white space */ + s=u_skipWhitespace(s); + + /* is there an "initial" or "surrogates" directive? */ + if(uprv_strncmp("initial", s, 7)==0) { + *pFlags=MBCS_STATE_FLAG_DIRECT; + s=u_skipWhitespace(s+7); + if(*s++!=',') { + return s-1; + } + } else if(*pFlags==0 && uprv_strncmp("surrogates", s, 10)==0) { + *pFlags=MBCS_STATE_FLAG_SURROGATES; + s=u_skipWhitespace(s+10); + if(*s++!=',') { + return s-1; + } + } else if(*s==0) { + /* empty state row: all-illegal */ + return NULL; + } + + for(;;) { + /* read an entry, the start of the range first */ + s=u_skipWhitespace(s); + start=uprv_strtoul(s, (char **)&t, 16); + if(s==t || 0xff<start) { + return s; + } + s=u_skipWhitespace(t); + + /* read the end of the range if there is one */ + if(*s=='-') { + s=u_skipWhitespace(s+1); + end=uprv_strtoul(s, (char **)&t, 16); + if(s==t || end<start || 0xff<end) { + return s; + } + s=u_skipWhitespace(t); + } else { + end=start; + } + + /* determine the state entrys for this range */ + if(*s!=':' && *s!='.') { + /* the default is: final state with valid entries */ + entry=MBCS_ENTRY_FINAL(0, MBCS_STATE_VALID_16, 0); + } else { + entry=MBCS_ENTRY_TRANSITION(0, 0); + if(*s==':') { + /* get the next state, default to 0 */ + s=u_skipWhitespace(s+1); + i=uprv_strtoul(s, (char **)&t, 16); + if(s!=t) { + if(0x7f<i) { + return s; + } + s=u_skipWhitespace(t); + entry=MBCS_ENTRY_SET_STATE(entry, i); + } + } + + /* get the state action, default to valid */ + if(*s=='.') { + /* this is a final state */ + entry=MBCS_ENTRY_SET_FINAL(entry); + + s=u_skipWhitespace(s+1); + if(*s=='u') { + /* unassigned set U+fffe */ + entry=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_UNASSIGNED, 0xfffe); + s=u_skipWhitespace(s+1); + } else if(*s=='p') { + if(*pFlags!=MBCS_STATE_FLAG_DIRECT) { + entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_VALID_16_PAIR); + } else { + entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_VALID_16); + } + s=u_skipWhitespace(s+1); + } else if(*s=='s') { + entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_CHANGE_ONLY); + s=u_skipWhitespace(s+1); + } else if(*s=='i') { + /* illegal set U+ffff */ + entry=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_ILLEGAL, 0xffff); + s=u_skipWhitespace(s+1); + } else { + /* default to valid */ + entry=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_VALID_16); + } + } else { + /* this is an intermediate state, nothing to do */ + } + } + + /* adjust "final valid" states according to the state flags */ + if(MBCS_ENTRY_FINAL_ACTION(entry)==MBCS_STATE_VALID_16) { + switch(*pFlags) { + case 0: + /* no adjustment */ + break; + case MBCS_STATE_FLAG_DIRECT: + /* set the valid-direct code point to "unassigned"==0xfffe */ + entry=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_VALID_DIRECT_16, 0xfffe); + break; + case MBCS_STATE_FLAG_SURROGATES: + entry=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_VALID_16_PAIR, 0); + break; + default: + break; + } + } + + /* set this entry for the range */ + for(i=start; i<=end; ++i) { + state[i]=entry; + } + + if(*s==',') { + ++s; + } else { + return *s==0 ? NULL : s; + } + } +} + +U_CAPI void U_EXPORT2 +ucm_addState(UCMStates *states, const char *s) { + const char *error; + + if(states->countStates==MBCS_MAX_STATE_COUNT) { + fprintf(stderr, "ucm error: too many states (maximum %u)\n", MBCS_MAX_STATE_COUNT); + exit(U_INVALID_TABLE_FORMAT); + } + + error=parseState(s, states->stateTable[states->countStates], + &states->stateFlags[states->countStates]); + if(error!=NULL) { + fprintf(stderr, "ucm error: parse error in state definition at '%s'\n", error); + exit(U_INVALID_TABLE_FORMAT); + } + + ++states->countStates; +} + +U_CAPI UBool U_EXPORT2 +ucm_parseHeaderLine(UCMFile *ucm, + char *line, char **pKey, char **pValue) { + UCMStates *states; + char *s, *end; + char c; + + states=&ucm->states; + + /* remove comments and trailing CR and LF and remove whitespace from the end */ + for(end=line; (c=*end)!=0; ++end) { + if(c=='#' || c=='\r' || c=='\n') { + break; + } + } + while(end>line && (*(end-1)==' ' || *(end-1)=='\t')) { + --end; + } + *end=0; + + /* skip leading white space and ignore empty lines */ + s=(char *)u_skipWhitespace(line); + if(*s==0) { + return TRUE; + } + + /* stop at the beginning of the mapping section */ + if(uprv_memcmp(s, "CHARMAP", 7)==0) { + return FALSE; + } + + /* get the key name, bracketed in <> */ + if(*s!='<') { + fprintf(stderr, "ucm error: no header field <key> in line \"%s\"\n", line); + exit(U_INVALID_TABLE_FORMAT); + } + *pKey=++s; + while(*s!='>') { + if(*s==0) { + fprintf(stderr, "ucm error: incomplete header field <key> in line \"%s\"\n", line); + exit(U_INVALID_TABLE_FORMAT); + } + ++s; + } + *s=0; + + /* get the value string, possibly quoted */ + s=(char *)u_skipWhitespace(s+1); + if(*s!='"') { + *pValue=s; + } else { + /* remove the quotes */ + *pValue=s+1; + if(end>*pValue && *(end-1)=='"') { + *--end=0; + } + } + + /* collect the information from the header field, ignore unknown keys */ + if(uprv_strcmp(*pKey, "uconv_class")==0) { + if(uprv_strcmp(*pValue, "DBCS")==0) { + states->conversionType=UCNV_DBCS; + } else if(uprv_strcmp(*pValue, "SBCS")==0) { + states->conversionType = UCNV_SBCS; + } else if(uprv_strcmp(*pValue, "MBCS")==0) { + states->conversionType = UCNV_MBCS; + } else if(uprv_strcmp(*pValue, "EBCDIC_STATEFUL")==0) { + states->conversionType = UCNV_EBCDIC_STATEFUL; + } else { + fprintf(stderr, "ucm error: unknown <uconv_class> %s\n", *pValue); + exit(U_INVALID_TABLE_FORMAT); + } + return TRUE; + } else if(uprv_strcmp(*pKey, "mb_cur_max")==0) { + c=**pValue; + if('1'<=c && c<='4' && (*pValue)[1]==0) { + states->maxCharLength=(int8_t)(c-'0'); + states->outputType=(int8_t)(states->maxCharLength-1); + } else { + fprintf(stderr, "ucm error: illegal <mb_cur_max> %s\n", *pValue); + exit(U_INVALID_TABLE_FORMAT); + } + return TRUE; + } else if(uprv_strcmp(*pKey, "mb_cur_min")==0) { + c=**pValue; + if('1'<=c && c<='4' && (*pValue)[1]==0) { + states->minCharLength=(int8_t)(c-'0'); + } else { + fprintf(stderr, "ucm error: illegal <mb_cur_min> %s\n", *pValue); + exit(U_INVALID_TABLE_FORMAT); + } + return TRUE; + } else if(uprv_strcmp(*pKey, "icu:state")==0) { + /* if an SBCS/DBCS/EBCDIC_STATEFUL converter has icu:state, then turn it into MBCS */ + switch(states->conversionType) { + case UCNV_SBCS: + case UCNV_DBCS: + case UCNV_EBCDIC_STATEFUL: + states->conversionType=UCNV_MBCS; + break; + case UCNV_MBCS: + break; + default: + fprintf(stderr, "ucm error: <icu:state> entry for non-MBCS table or before the <uconv_class> line\n"); + exit(U_INVALID_TABLE_FORMAT); + } + + if(states->maxCharLength==0) { + fprintf(stderr, "ucm error: <icu:state> before the <mb_cur_max> line\n"); + exit(U_INVALID_TABLE_FORMAT); + } + ucm_addState(states, *pValue); + return TRUE; + } else if(uprv_strcmp(*pKey, "icu:base")==0) { + if(**pValue==0) { + fprintf(stderr, "ucm error: <icu:base> without a base table name\n"); + exit(U_INVALID_TABLE_FORMAT); + } + uprv_strcpy(ucm->baseName, *pValue); + return TRUE; + } + + return FALSE; +} + +/* post-processing ---------------------------------------------------------- */ + +static int32_t +sumUpStates(UCMStates *states) { + int32_t entry, sum, state, cell, count; + UBool allStatesReady; + + /* + * Sum up the offsets for all states. + * In each final state (where there are only final entries), + * the offsets add up directly. + * In all other state table rows, for each transition entry to another state, + * the offsets sum of that state needs to be added. + * This is achieved in at most countStates iterations. + */ + allStatesReady=FALSE; + for(count=states->countStates; !allStatesReady && count>=0; --count) { + allStatesReady=TRUE; + for(state=states->countStates-1; state>=0; --state) { + if(!(states->stateFlags[state]&MBCS_STATE_FLAG_READY)) { + allStatesReady=FALSE; + sum=0; + + /* at first, add up only the final delta offsets to keep them <512 */ + for(cell=0; cell<256; ++cell) { + entry=states->stateTable[state][cell]; + if(MBCS_ENTRY_IS_FINAL(entry)) { + switch(MBCS_ENTRY_FINAL_ACTION(entry)) { + case MBCS_STATE_VALID_16: + states->stateTable[state][cell]=MBCS_ENTRY_FINAL_SET_VALUE(entry, sum); + sum+=1; + break; + case MBCS_STATE_VALID_16_PAIR: + states->stateTable[state][cell]=MBCS_ENTRY_FINAL_SET_VALUE(entry, sum); + sum+=2; + break; + default: + /* no addition */ + break; + } + } + } + + /* now, add up the delta offsets for the transitional entries */ + for(cell=0; cell<256; ++cell) { + entry=states->stateTable[state][cell]; + if(MBCS_ENTRY_IS_TRANSITION(entry)) { + if(states->stateFlags[MBCS_ENTRY_TRANSITION_STATE(entry)]&MBCS_STATE_FLAG_READY) { + states->stateTable[state][cell]=MBCS_ENTRY_TRANSITION_SET_OFFSET(entry, sum); + sum+=states->stateOffsetSum[MBCS_ENTRY_TRANSITION_STATE(entry)]; + } else { + /* that next state does not have a sum yet, we cannot finish the one for this state */ + sum=-1; + break; + } + } + } + + if(sum!=-1) { + states->stateOffsetSum[state]=sum; + states->stateFlags[state]|=MBCS_STATE_FLAG_READY; + } + } + } + } + + if(!allStatesReady) { + fprintf(stderr, "ucm error: the state table contains loops\n"); + exit(U_INVALID_TABLE_FORMAT); + } + + /* + * For all "direct" (i.e., initial) states>0, + * the offsets need to be increased by the sum of + * the previous initial states. + */ + sum=states->stateOffsetSum[0]; + for(state=1; state<states->countStates; ++state) { + if((states->stateFlags[state]&0xf)==MBCS_STATE_FLAG_DIRECT) { + int32_t sum2=sum; + sum+=states->stateOffsetSum[state]; + for(cell=0; cell<256; ++cell) { + entry=states->stateTable[state][cell]; + if(MBCS_ENTRY_IS_TRANSITION(entry)) { + states->stateTable[state][cell]=MBCS_ENTRY_TRANSITION_ADD_OFFSET(entry, sum2); + } + } + } + } + + /* round up to the next even number to have the following data 32-bit-aligned */ + return states->countToUCodeUnits=(sum+1)&~1; +} + +U_CAPI void U_EXPORT2 +ucm_processStates(UCMStates *states, UBool ignoreSISOCheck) { + int32_t entry, state, cell, count; + + if(states->conversionType==UCNV_UNSUPPORTED_CONVERTER) { + fprintf(stderr, "ucm error: missing conversion type (<uconv_class>)\n"); + exit(U_INVALID_TABLE_FORMAT); + } + + if(states->countStates==0) { + switch(states->conversionType) { + case UCNV_SBCS: + /* SBCS: use MBCS data structure with a default state table */ + if(states->maxCharLength!=1) { + fprintf(stderr, "error: SBCS codepage with max B/char!=1\n"); + exit(U_INVALID_TABLE_FORMAT); + } + states->conversionType=UCNV_MBCS; + ucm_addState(states, "0-ff"); + break; + case UCNV_MBCS: + fprintf(stderr, "ucm error: missing state table information (<icu:state>) for MBCS\n"); + exit(U_INVALID_TABLE_FORMAT); + break; + case UCNV_EBCDIC_STATEFUL: + /* EBCDIC_STATEFUL: use MBCS data structure with a default state table */ + if(states->minCharLength!=1 || states->maxCharLength!=2) { + fprintf(stderr, "error: DBCS codepage with min B/char!=1 or max B/char!=2\n"); + exit(U_INVALID_TABLE_FORMAT); + } + states->conversionType=UCNV_MBCS; + ucm_addState(states, "0-ff, e:1.s, f:0.s"); + ucm_addState(states, "initial, 0-3f:4, e:1.s, f:0.s, 40:3, 41-fe:2, ff:4"); + ucm_addState(states, "0-40:1.i, 41-fe:1., ff:1.i"); + ucm_addState(states, "0-ff:1.i, 40:1."); + ucm_addState(states, "0-ff:1.i"); + break; + case UCNV_DBCS: + /* DBCS: use MBCS data structure with a default state table */ + if(states->minCharLength!=2 || states->maxCharLength!=2) { + fprintf(stderr, "error: DBCS codepage with min or max B/char!=2\n"); + exit(U_INVALID_TABLE_FORMAT); + } + states->conversionType = UCNV_MBCS; + ucm_addState(states, "0-3f:3, 40:2, 41-fe:1, ff:3"); + ucm_addState(states, "41-fe"); + ucm_addState(states, "40"); + ucm_addState(states, ""); + break; + default: + fprintf(stderr, "ucm error: unknown charset structure\n"); + exit(U_INVALID_TABLE_FORMAT); + break; + } + } + + /* + * check that the min/max character lengths are reasonable; + * to do this right, all paths through the state table would have to be + * recursively walked while keeping track of the sequence lengths, + * but these simple checks cover most state tables in practice + */ + if(states->maxCharLength<states->minCharLength) { + fprintf(stderr, "ucm error: max B/char < min B/char\n"); + exit(U_INVALID_TABLE_FORMAT); + } + + /* count non-direct states and compare with max B/char */ + count=0; + for(state=0; state<states->countStates; ++state) { + if((states->stateFlags[state]&0xf)!=MBCS_STATE_FLAG_DIRECT) { + ++count; + } + } + if(states->maxCharLength>count+1) { + fprintf(stderr, "ucm error: max B/char too large\n"); + exit(U_INVALID_TABLE_FORMAT); + } + + if(states->minCharLength==1) { + int32_t action; + + /* + * if there are single-byte characters, + * then the initial state must have direct result states + */ + for(cell=0; cell<256; ++cell) { + entry=states->stateTable[0][cell]; + if( MBCS_ENTRY_IS_FINAL(entry) && + ((action=MBCS_ENTRY_FINAL_ACTION(entry))==MBCS_STATE_VALID_DIRECT_16 || + action==MBCS_STATE_UNASSIGNED) + ) { + break; + } + } + + if(cell==256) { + fprintf(stderr, "ucm warning: min B/char too small\n"); + } + } + + /* + * make sure that all "next state" values are within limits + * and that all next states after final ones have the "direct" + * flag of initial states + */ + for(state=states->countStates-1; state>=0; --state) { + for(cell=0; cell<256; ++cell) { + entry=states->stateTable[state][cell]; + if((uint8_t)MBCS_ENTRY_STATE(entry)>=states->countStates) { + fprintf(stderr, "ucm error: state table entry [%x][%x] has a next state of %x that is too high\n", + (int)state, (int)cell, (int)MBCS_ENTRY_STATE(entry)); + exit(U_INVALID_TABLE_FORMAT); + } + if(MBCS_ENTRY_IS_FINAL(entry) && (states->stateFlags[MBCS_ENTRY_STATE(entry)]&0xf)!=MBCS_STATE_FLAG_DIRECT) { + fprintf(stderr, "ucm error: state table entry [%x][%x] is final but has a non-initial next state of %x\n", + (int)state, (int)cell, (int)MBCS_ENTRY_STATE(entry)); + exit(U_INVALID_TABLE_FORMAT); + } else if(MBCS_ENTRY_IS_TRANSITION(entry) && (states->stateFlags[MBCS_ENTRY_STATE(entry)]&0xf)==MBCS_STATE_FLAG_DIRECT) { + fprintf(stderr, "ucm error: state table entry [%x][%x] is not final but has an initial next state of %x\n", + (int)state, (int)cell, (int)MBCS_ENTRY_STATE(entry)); + exit(U_INVALID_TABLE_FORMAT); + } + } + } + + /* is this an SI/SO (like EBCDIC-stateful) state table? */ + if(states->countStates>=2 && (states->stateFlags[1]&0xf)==MBCS_STATE_FLAG_DIRECT) { + if(states->maxCharLength!=2) { + fprintf(stderr, "ucm error: SI/SO codepages must have max 2 bytes/char (not %x)\n", (int)states->maxCharLength); + exit(U_INVALID_TABLE_FORMAT); + } + if(states->countStates<3) { + fprintf(stderr, "ucm error: SI/SO codepages must have at least 3 states (not %x)\n", (int)states->countStates); + exit(U_INVALID_TABLE_FORMAT); + } + /* are the SI/SO all in the right places? */ + if( ignoreSISOCheck || + (states->stateTable[0][0xe]==MBCS_ENTRY_FINAL(1, MBCS_STATE_CHANGE_ONLY, 0) && + states->stateTable[0][0xf]==MBCS_ENTRY_FINAL(0, MBCS_STATE_CHANGE_ONLY, 0) && + states->stateTable[1][0xe]==MBCS_ENTRY_FINAL(1, MBCS_STATE_CHANGE_ONLY, 0) && + states->stateTable[1][0xf]==MBCS_ENTRY_FINAL(0, MBCS_STATE_CHANGE_ONLY, 0)) + ) { + states->outputType=MBCS_OUTPUT_2_SISO; + } else { + fprintf(stderr, "ucm error: SI/SO codepages must have in states 0 and 1 transitions e:1.s, f:0.s\n"); + exit(U_INVALID_TABLE_FORMAT); + } + state=2; + } else { + state=1; + } + + /* check that no unexpected state is a "direct" one */ + while(state<states->countStates) { + if((states->stateFlags[state]&0xf)==MBCS_STATE_FLAG_DIRECT) { + fprintf(stderr, "ucm error: state %d is 'initial' - not supported except for SI/SO codepages\n", (int)state); + exit(U_INVALID_TABLE_FORMAT); + } + ++state; + } + + sumUpStates(states); +} + +/* find a fallback for this offset; return the index or -1 if not found */ +U_CAPI int32_t U_EXPORT2 +ucm_findFallback(_MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks, + uint32_t offset) { + int32_t i; + + if(countToUFallbacks==0) { + /* shortcut: most codepages do not have fallbacks from codepage to Unicode */ + return -1; + } + + /* do a linear search for the fallback mapping (the table is not yet sorted) */ + for(i=0; i<countToUFallbacks; ++i) { + if(offset==toUFallbacks[i].offset) { + return i; + } + } + return -1; +} + +/* + * This function tries to compact toUnicode tables for 2-byte codepages + * by finding lead bytes with all-unassigned trail bytes and adding another state + * for them. + */ +static void +compactToUnicode2(UCMStates *states, + uint16_t **pUnicodeCodeUnits, + _MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks, + UBool verbose) { + int32_t (*oldStateTable)[256]; + uint16_t count[256]; + uint16_t *oldUnicodeCodeUnits; + int32_t entry, offset, oldOffset, trailOffset, oldTrailOffset, savings, sum; + int32_t i, j, leadState, trailState, newState, fallback; + uint16_t unit; + + /* find the lead state */ + if(states->outputType==MBCS_OUTPUT_2_SISO) { + /* use the DBCS lead state for SI/SO codepages */ + leadState=1; + } else { + leadState=0; + } + + /* find the main trail state: the most used target state */ + uprv_memset(count, 0, sizeof(count)); + for(i=0; i<256; ++i) { + entry=states->stateTable[leadState][i]; + if(MBCS_ENTRY_IS_TRANSITION(entry)) { + ++count[MBCS_ENTRY_TRANSITION_STATE(entry)]; + } + } + trailState=0; + for(i=1; i<states->countStates; ++i) { + if(count[i]>count[trailState]) { + trailState=i; + } + } + + /* count possible savings from lead bytes with all-unassigned results in all trail bytes */ + uprv_memset(count, 0, sizeof(count)); + savings=0; + /* for each lead byte */ + for(i=0; i<256; ++i) { + entry=states->stateTable[leadState][i]; + if(MBCS_ENTRY_IS_TRANSITION(entry) && (MBCS_ENTRY_TRANSITION_STATE(entry))==trailState) { + /* the offset is different for each lead byte */ + offset=MBCS_ENTRY_TRANSITION_OFFSET(entry); + /* for each trail byte for this lead byte */ + for(j=0; j<256; ++j) { + entry=states->stateTable[trailState][j]; + switch(MBCS_ENTRY_FINAL_ACTION(entry)) { + case MBCS_STATE_VALID_16: + entry=offset+MBCS_ENTRY_FINAL_VALUE_16(entry); + if((*pUnicodeCodeUnits)[entry]==0xfffe && ucm_findFallback(toUFallbacks, countToUFallbacks, entry)<0) { + ++count[i]; + } else { + j=999; /* do not count for this lead byte because there are assignments */ + } + break; + case MBCS_STATE_VALID_16_PAIR: + entry=offset+MBCS_ENTRY_FINAL_VALUE_16(entry); + if((*pUnicodeCodeUnits)[entry]==0xfffe) { + count[i]+=2; + } else { + j=999; /* do not count for this lead byte because there are assignments */ + } + break; + default: + break; + } + } + if(j==256) { + /* all trail bytes for this lead byte are unassigned */ + savings+=count[i]; + } else { + count[i]=0; + } + } + } + /* subtract from the possible savings the cost of an additional state */ + savings=savings*2-1024; /* count bytes, not 16-bit words */ + if(savings<=0) { + return; + } + if(verbose) { + printf("compacting toUnicode data saves %ld bytes\n", (long)savings); + } + if(states->countStates>=MBCS_MAX_STATE_COUNT) { + fprintf(stderr, "cannot compact toUnicode because the maximum number of states is reached\n"); + return; + } + + /* make a copy of the state table */ + oldStateTable=(int32_t (*)[256])uprv_malloc(states->countStates*1024); + if(oldStateTable==NULL) { + fprintf(stderr, "cannot compact toUnicode: out of memory\n"); + return; + } + uprv_memcpy(oldStateTable, states->stateTable, states->countStates*1024); + + /* add the new state */ + /* + * this function does not catch the degenerate case where all lead bytes + * have all-unassigned trail bytes and the lead state could be removed + */ + newState=states->countStates++; + states->stateFlags[newState]=0; + /* copy the old trail state, turning all assigned states into unassigned ones */ + for(i=0; i<256; ++i) { + entry=states->stateTable[trailState][i]; + switch(MBCS_ENTRY_FINAL_ACTION(entry)) { + case MBCS_STATE_VALID_16: + case MBCS_STATE_VALID_16_PAIR: + states->stateTable[newState][i]=MBCS_ENTRY_FINAL_SET_ACTION_VALUE(entry, MBCS_STATE_UNASSIGNED, 0xfffe); + break; + default: + states->stateTable[newState][i]=entry; + break; + } + } + + /* in the lead state, redirect all lead bytes with all-unassigned trail bytes to the new state */ + for(i=0; i<256; ++i) { + if(count[i]>0) { + states->stateTable[leadState][i]=MBCS_ENTRY_SET_STATE(states->stateTable[leadState][i], newState); + } + } + + /* sum up the new state table */ + for(i=0; i<states->countStates; ++i) { + states->stateFlags[i]&=~MBCS_STATE_FLAG_READY; + } + sum=sumUpStates(states); + + /* allocate a new, smaller code units array */ + oldUnicodeCodeUnits=*pUnicodeCodeUnits; + if(sum==0) { + *pUnicodeCodeUnits=NULL; + if(oldUnicodeCodeUnits!=NULL) { + uprv_free(oldUnicodeCodeUnits); + } + uprv_free(oldStateTable); + return; + } + *pUnicodeCodeUnits=(uint16_t *)uprv_malloc(sum*sizeof(uint16_t)); + if(*pUnicodeCodeUnits==NULL) { + fprintf(stderr, "cannot compact toUnicode: out of memory allocating %ld 16-bit code units\n", + (long)sum); + /* revert to the old state table */ + *pUnicodeCodeUnits=oldUnicodeCodeUnits; + --states->countStates; + uprv_memcpy(states->stateTable, oldStateTable, states->countStates*1024); + uprv_free(oldStateTable); + return; + } + for(i=0; i<sum; ++i) { + (*pUnicodeCodeUnits)[i]=0xfffe; + } + + /* copy the code units for all assigned characters */ + /* + * The old state table has the same lead _and_ trail states for assigned characters! + * The differences are in the offsets, and in the trail states for some unassigned characters. + * For each character with an assigned state in the new table, it was assigned in the old one. + * Only still-assigned characters are copied. + * Note that fallback mappings need to get their offset values adjusted. + */ + + /* for each initial state */ + for(leadState=0; leadState<states->countStates; ++leadState) { + if((states->stateFlags[leadState]&0xf)==MBCS_STATE_FLAG_DIRECT) { + /* for each lead byte from there */ + for(i=0; i<256; ++i) { + entry=states->stateTable[leadState][i]; + if(MBCS_ENTRY_IS_TRANSITION(entry)) { + trailState=(uint8_t)MBCS_ENTRY_TRANSITION_STATE(entry); + /* the new state does not have assigned states */ + if(trailState!=newState) { + trailOffset=MBCS_ENTRY_TRANSITION_OFFSET(entry); + oldTrailOffset=MBCS_ENTRY_TRANSITION_OFFSET(oldStateTable[leadState][i]); + /* for each trail byte */ + for(j=0; j<256; ++j) { + entry=states->stateTable[trailState][j]; + /* copy assigned-character code units and adjust fallback offsets */ + switch(MBCS_ENTRY_FINAL_ACTION(entry)) { + case MBCS_STATE_VALID_16: + offset=trailOffset+MBCS_ENTRY_FINAL_VALUE_16(entry); + /* find the old offset according to the old state table */ + oldOffset=oldTrailOffset+MBCS_ENTRY_FINAL_VALUE_16(oldStateTable[trailState][j]); + unit=(*pUnicodeCodeUnits)[offset]=oldUnicodeCodeUnits[oldOffset]; + if(unit==0xfffe && (fallback=ucm_findFallback(toUFallbacks, countToUFallbacks, oldOffset))>=0) { + toUFallbacks[fallback].offset=0x80000000|offset; + } + break; + case MBCS_STATE_VALID_16_PAIR: + offset=trailOffset+MBCS_ENTRY_FINAL_VALUE_16(entry); + /* find the old offset according to the old state table */ + oldOffset=oldTrailOffset+MBCS_ENTRY_FINAL_VALUE_16(oldStateTable[trailState][j]); + (*pUnicodeCodeUnits)[offset++]=oldUnicodeCodeUnits[oldOffset++]; + (*pUnicodeCodeUnits)[offset]=oldUnicodeCodeUnits[oldOffset]; + break; + default: + break; + } + } + } + } + } + } + } + + /* remove temporary flags from fallback offsets that protected them from being modified twice */ + for(i=0; i<countToUFallbacks; ++i) { + toUFallbacks[i].offset&=0x7fffffff; + } + + /* free temporary memory */ + uprv_free(oldUnicodeCodeUnits); + uprv_free(oldStateTable); +} + +/* + * recursive sub-function of compactToUnicodeHelper() + * returns: + * >0 number of bytes that are used in unicodeCodeUnits[] that could be saved, + * if all sequences from this state are unassigned, returns the + * <0 there are assignments in unicodeCodeUnits[] + * 0 no use of unicodeCodeUnits[] + */ +static int32_t +findUnassigned(UCMStates *states, + uint16_t *unicodeCodeUnits, + _MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks, + int32_t state, int32_t offset, uint32_t b) { + int32_t i, entry, savings, localSavings, belowSavings; + UBool haveAssigned; + + localSavings=belowSavings=0; + haveAssigned=FALSE; + for(i=0; i<256; ++i) { + entry=states->stateTable[state][i]; + if(MBCS_ENTRY_IS_TRANSITION(entry)) { + savings=findUnassigned(states, + unicodeCodeUnits, + toUFallbacks, countToUFallbacks, + MBCS_ENTRY_TRANSITION_STATE(entry), + offset+MBCS_ENTRY_TRANSITION_OFFSET(entry), + (b<<8)|(uint32_t)i); + if(savings<0) { + haveAssigned=TRUE; + } else if(savings>0) { + printf(" all-unassigned sequences from prefix 0x%02lx state %ld use %ld bytes\n", + (unsigned long)((b<<8)|i), (long)state, (long)savings); + belowSavings+=savings; + } + } else if(!haveAssigned) { + switch(MBCS_ENTRY_FINAL_ACTION(entry)) { + case MBCS_STATE_VALID_16: + entry=offset+MBCS_ENTRY_FINAL_VALUE_16(entry); + if(unicodeCodeUnits[entry]==0xfffe && ucm_findFallback(toUFallbacks, countToUFallbacks, entry)<0) { + localSavings+=2; + } else { + haveAssigned=TRUE; + } + break; + case MBCS_STATE_VALID_16_PAIR: + entry=offset+MBCS_ENTRY_FINAL_VALUE_16(entry); + if(unicodeCodeUnits[entry]==0xfffe) { + localSavings+=4; + } else { + haveAssigned=TRUE; + } + break; + default: + break; + } + } + } + if(haveAssigned) { + return -1; + } else { + return localSavings+belowSavings; + } +} + +/* helper function for finding compaction opportunities */ +static void +compactToUnicodeHelper(UCMStates *states, + uint16_t *unicodeCodeUnits, + _MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks) { + int32_t state, savings; + + /* for each initial state */ + for(state=0; state<states->countStates; ++state) { + if((states->stateFlags[state]&0xf)==MBCS_STATE_FLAG_DIRECT) { + savings=findUnassigned(states, + unicodeCodeUnits, + toUFallbacks, countToUFallbacks, + state, 0, 0); + if(savings>0) { + printf(" all-unassigned sequences from initial state %ld use %ld bytes\n", + (long)state, (long)savings); + } + } + } +} + +static int32_t +compareFallbacks(const void *context, const void *fb1, const void *fb2) { + return ((const _MBCSToUFallback *)fb1)->offset-((const _MBCSToUFallback *)fb2)->offset; +} + +U_CAPI void U_EXPORT2 +ucm_optimizeStates(UCMStates *states, + uint16_t **pUnicodeCodeUnits, + _MBCSToUFallback *toUFallbacks, int32_t countToUFallbacks, + UBool verbose) { + UErrorCode errorCode; + int32_t state, cell, entry; + + /* test each state table entry */ + for(state=0; state<states->countStates; ++state) { + for(cell=0; cell<256; ++cell) { + entry=states->stateTable[state][cell]; + /* + * if the entry is a final one with an MBCS_STATE_VALID_DIRECT_16 action code + * and the code point is "unassigned" (0xfffe), then change it to + * the "unassigned" action code with bits 26..23 set to zero and U+fffe. + */ + if(MBCS_ENTRY_SET_STATE(entry, 0)==MBCS_ENTRY_FINAL(0, MBCS_STATE_VALID_DIRECT_16, 0xfffe)) { + states->stateTable[state][cell]=MBCS_ENTRY_FINAL_SET_ACTION(entry, MBCS_STATE_UNASSIGNED); + } + } + } + + /* try to compact the toUnicode tables */ + if(states->maxCharLength==2) { + compactToUnicode2(states, pUnicodeCodeUnits, toUFallbacks, countToUFallbacks, verbose); + } else if(states->maxCharLength>2) { + if(verbose) { + compactToUnicodeHelper(states, *pUnicodeCodeUnits, toUFallbacks, countToUFallbacks); + } + } + + /* sort toUFallbacks */ + /* + * It should be safe to sort them before compactToUnicode2() is called, + * because it should not change the relative order of the offset values + * that it adjusts, but they need to be sorted at some point, and + * it is safest here. + */ + if(countToUFallbacks>0) { + errorCode=U_ZERO_ERROR; /* nothing bad will happen... */ + uprv_sortArray(toUFallbacks, countToUFallbacks, + sizeof(_MBCSToUFallback), + compareFallbacks, NULL, FALSE, &errorCode); + } +} + +/* use a complete state table ----------------------------------------------- */ + +U_CAPI int32_t U_EXPORT2 +ucm_countChars(UCMStates *states, + const uint8_t *bytes, int32_t length) { + uint32_t offset; + int32_t i, entry, count; + uint8_t state; + + offset=0; + count=0; + state=0; + + if(states->countStates==0) { + fprintf(stderr, "ucm error: there is no state information!\n"); + return -1; + } + + /* for SI/SO (like EBCDIC-stateful), double-byte sequences start in state 1 */ + if(length==2 && states->outputType==MBCS_OUTPUT_2_SISO) { + state=1; + } + + /* + * Walk down the state table like in conversion, + * much like getNextUChar(). + * We assume that c<=0x10ffff. + */ + for(i=0; i<length; ++i) { + entry=states->stateTable[state][bytes[i]]; + if(MBCS_ENTRY_IS_TRANSITION(entry)) { + state=(uint8_t)MBCS_ENTRY_TRANSITION_STATE(entry); + offset+=MBCS_ENTRY_TRANSITION_OFFSET(entry); + } else { + switch(MBCS_ENTRY_FINAL_ACTION(entry)) { + case MBCS_STATE_ILLEGAL: + fprintf(stderr, "ucm error: byte sequence ends in illegal state\n"); + return -1; + case MBCS_STATE_CHANGE_ONLY: + fprintf(stderr, "ucm error: byte sequence ends in state-change-only\n"); + return -1; + case MBCS_STATE_UNASSIGNED: + case MBCS_STATE_FALLBACK_DIRECT_16: + case MBCS_STATE_VALID_DIRECT_16: + case MBCS_STATE_FALLBACK_DIRECT_20: + case MBCS_STATE_VALID_DIRECT_20: + case MBCS_STATE_VALID_16: + case MBCS_STATE_VALID_16_PAIR: + /* count a complete character and prepare for a new one */ + ++count; + state=(uint8_t)MBCS_ENTRY_FINAL_STATE(entry); + offset=0; + break; + default: + /* reserved, must never occur */ + fprintf(stderr, "ucm error: byte sequence reached reserved action code, entry: 0x%02lx\n", (unsigned long)entry); + return -1; + } + } + } + + if(offset!=0) { + fprintf(stderr, "ucm error: byte sequence too short, ends in non-final state %u\n", state); + return -1; + } + + /* + * for SI/SO (like EBCDIC-stateful), multiple-character results + * must consist of only double-byte sequences + */ + if(count>1 && states->outputType==MBCS_OUTPUT_2_SISO && length!=2*count) { + fprintf(stderr, "ucm error: SI/SO (like EBCDIC-stateful) result with %d characters does not contain all DBCS\n", (int)count); + return -1; + } + + return count; +} +#endif |