--- /dev/null
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+*
+* Copyright (C) 2003-2012, International Business Machines
+* Corporation and others. All Rights Reserved.
+*
+*******************************************************************************
+* file name: ucmstate.c
+* encoding: UTF-8
+* 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);
+ }
+ }
+ }
+}
+
+U_CDECL_BEGIN
+static int32_t U_CALLCONV
+compareFallbacks(const void *context, const void *fb1, const void *fb2) {
+ (void)context;
+ return ((const _MBCSToUFallback *)fb1)->offset-((const _MBCSToUFallback *)fb2)->offset;
+}
+U_CDECL_END
+
+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
+
projects / apple / icu.git / blobdiff