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?? ..
?? Makefile(678 B)
?? convsamp.cpp(29.17 KB)
?? data01.txt(579 B)
?? data02.bin(1.75 KB)
?? data06.txt(2.29 KB)
?? flagcb.c(8.97 KB)
?? flagcb.h(1.65 KB)
?? readme.txt(2.44 KB)
?? ucnv.sln(1.17 KB)
?? ucnv.vcxproj(9.3 KB)
?? ucnv.vcxproj.filters(1.06 KB)

Editing: flagcb.c

/**************************************************************************
 * © 2016 and later: Unicode, Inc. and others.
 * License & terms of use: http://www.unicode.org/copyright.html#License
 **************************************************************************
 **************************************************************************
 * COPYRIGHT:
 * Copyright (c) 1999-2007, International Business Machines Corporation and
 * others. All Rights Reserved.
 **************************************************************************/

#include "unicode/utypes.h"
#include "unicode/ucnv.h"
#include "flagcb.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#define DEBUG_TMI 0  /* set to 1 for Too Much Information (TMI) */

U_CAPI FromUFLAGContext* U_EXPORT2  flagCB_fromU_openContext()
{
    FromUFLAGContext *ctx;

ctx = (FromUFLAGContext*) malloc(sizeof(FromUFLAGContext));

ctx->subCallback = NULL;
    ctx->subContext  = NULL;
    ctx->flag        = FALSE;

return ctx;
}

U_CAPI void U_EXPORT2 flagCB_fromU(
                  const void *context,
                  UConverterFromUnicodeArgs *fromUArgs,
                  const UChar* codeUnits,
                  int32_t length,
                  UChar32 codePoint,
                  UConverterCallbackReason reason,
				  UErrorCode * err)
{
  /* First step - based on the reason code, take action */

if(reason == UCNV_UNASSIGNED) { /* whatever set should be trapped here */
    ((FromUFLAGContext*)context)->flag = TRUE;
  }

if(reason == UCNV_CLONE) {
      /* The following is the recommended way to implement UCNV_CLONE
         in a callback. */
      UConverterFromUCallback   saveCallback;
      const void *saveContext;
      FromUFLAGContext *old, *cloned;
      UErrorCode subErr = U_ZERO_ERROR;

#if DEBUG_TMI
      printf("*** FLAGCB: cloning %p ***\n", context);
#endif
      old = (FromUFLAGContext*)context;
      cloned = flagCB_fromU_openContext();
      
      memcpy(cloned, old, sizeof(FromUFLAGContext));

#if DEBUG_TMI
      printf("%p: my subcb=%p:%p\n", old, old->subCallback, 
             old->subContext);
      printf("%p: cloned subcb=%p:%p\n", cloned, cloned->subCallback, 
             cloned->subContext);
#endif

/* We need to get the sub CB to handle cloning, 
       * so we have to set up the following, temporarily:
       *
       *   - Set the callback+context to the sub of this (flag) cb
       *   - preserve the current cb+context, it could be anything
       *
       *   Before:
       *      CNV  ->   FLAG ->  subcb -> ...
       *
       *   After:
       *      CNV  ->   subcb -> ...
       *
       *    The chain from 'something' on is saved, and will be restored
       *   at the end of this block.
       *
       */
      
      ucnv_setFromUCallBack(fromUArgs->converter,
                            cloned->subCallback,
                            cloned->subContext,
                            &saveCallback,
                            &saveContext,
                            &subErr);
      
      if( cloned->subCallback != NULL ) {
          /* Now, call the sub callback if present */
          cloned->subCallback(cloned->subContext, fromUArgs, codeUnits,
                              length, codePoint, reason, err);
      }
      
      ucnv_setFromUCallBack(fromUArgs->converter,
                            saveCallback,  /* Us */
                            cloned,        /* new context */
                            &cloned->subCallback,  /* IMPORTANT! Accept any change in CB or context */
                            &cloned->subContext,
                            &subErr);

if(U_FAILURE(subErr)) {
          *err = subErr;
      }
  }

/* process other reasons here if need be */

/* Always call the subCallback if present */
  if(((FromUFLAGContext*)context)->subCallback != NULL &&
      reason != UCNV_CLONE) {
      ((FromUFLAGContext*)context)->subCallback(  ((FromUFLAGContext*)context)->subContext,
                                                  fromUArgs,
                                                  codeUnits,
                                                  length,
                                                  codePoint,
                                                  reason,
                                                  err);
  }

/* cleanup - free the memory AFTER calling the sub CB */
  if(reason == UCNV_CLOSE) {
      free((void*)context);
  }
}

/* Debugging callback, just outputs what happens */

/* Test safe clone callback */

static uint32_t    debugCB_nextSerial()
{
    static uint32_t n = 1;
    
    return (n++);
}

static void debugCB_print_log(debugCBContext *q, const char *name)
{
    if(q==NULL) {
        printf("debugCBontext: %s is NULL!!\n", name);
    } else {
        if(q->magic != 0xC0FFEE) {
            fprintf(stderr, "debugCBContext: %p:%d's magic is %x, supposed to be 0xC0FFEE\n",
                    q,q->serial, q->magic);
        }
        printf("debugCBContext %p:%d=%s - magic %x\n",
                    q, q->serial, name, q->magic);
    }
}

static debugCBContext *debugCB_clone(debugCBContext *ctx)
{
    debugCBContext *newCtx;
    newCtx = malloc(sizeof(debugCBContext));
    
    newCtx->serial = debugCB_nextSerial();
    newCtx->magic = 0xC0FFEE;

newCtx->subCallback = ctx->subCallback;
    newCtx->subContext = ctx->subContext;
    
#if DEBUG_TMI
    printf("debugCB_clone: %p:%d -> new context %p:%d\n", ctx, ctx->serial, newCtx, newCtx->serial);
#endif
    
    return newCtx;
}

void debugCB_fromU(const void *context,
                   UConverterFromUnicodeArgs *fromUArgs,
                   const UChar* codeUnits,
                   int32_t length,
                   UChar32 codePoint,
                   UConverterCallbackReason reason,
                   UErrorCode * err)
{
    debugCBContext *ctx = (debugCBContext*)context;
    /*UConverterFromUCallback junkFrom;*/
    
#if DEBUG_TMI
    printf("debugCB_fromU: Context %p:%d called, reason %d on cnv %p [err=%s]\n", ctx, ctx->serial, reason, fromUArgs->converter, u_errorName(*err));
#endif

if(ctx->magic != 0xC0FFEE) {
        fprintf(stderr, "debugCB_fromU: Context %p:%d magic is 0x%x should be 0xC0FFEE.\n", ctx,ctx->serial, ctx->magic);
        return;
    }

if(reason == UCNV_CLONE) {
        /* see comments in above flagCB clone code */

UConverterFromUCallback   saveCallback;
        const void *saveContext;
        debugCBContext *cloned;
        UErrorCode subErr = U_ZERO_ERROR;

/* "recreate" it */
#if DEBUG_TMI
        printf("debugCB_fromU: cloning..\n");
#endif
        cloned = debugCB_clone(ctx);

if(cloned == NULL) {
            fprintf(stderr, "debugCB_fromU: internal clone failed on %p\n", ctx);
            *err = U_MEMORY_ALLOCATION_ERROR;
            return;
        }

ucnv_setFromUCallBack(fromUArgs->converter,
                              cloned->subCallback,
                              cloned->subContext,
                              &saveCallback,
                              &saveContext,
                              &subErr);
        
        if( cloned->subCallback != NULL) {
#if DEBUG_TMI
            printf("debugCB_fromU:%p calling subCB %p\n", ctx, cloned->subCallback);
#endif
            /* call subCB if present */
            cloned->subCallback(cloned->subContext, fromUArgs, codeUnits,
                                length, codePoint, reason, err);
        } else {
            printf("debugCB_fromU:%p, NOT calling subCB, it's NULL\n", ctx);
        }

/* set back callback */
        ucnv_setFromUCallBack(fromUArgs->converter,
                              saveCallback,  /* Us */
                              cloned,        /* new context */
                              &cloned->subCallback,  /* IMPORTANT! Accept any change in CB or context */
                              &cloned->subContext,
                              &subErr);
        
        if(U_FAILURE(subErr)) {
            *err = subErr;
        }
    }
    
    /* process other reasons here */

/* always call subcb if present */
    if(ctx->subCallback != NULL && reason != UCNV_CLONE) {
        ctx->subCallback(ctx->subContext,
                         fromUArgs,
                         codeUnits,
                         length,
                         codePoint,
                         reason,
                         err);
    }

if(reason == UCNV_CLOSE) {
#if DEBUG_TMI
        printf("debugCB_fromU: Context %p:%d closing\n", ctx, ctx->serial);
#endif
        free(ctx);
    }

#if DEBUG_TMI
    printf("debugCB_fromU: leaving cnv %p, ctx %p: err %s\n", fromUArgs->converter, ctx, u_errorName(*err));
#endif
}

debugCBContext *debugCB_openContext()
{
    debugCBContext *ctx;

ctx = malloc(sizeof(debugCBContext));

if(ctx != NULL) {
        ctx->magic = 0xC0FFEE;
        ctx->serial = debugCB_nextSerial();
        ctx->subCallback = NULL;
        ctx->subContext  = NULL;

#if DEBUG_TMI
        fprintf(stderr, "debugCB:openContext opened[%p] = serial #%d\n", ctx, ctx->serial);
#endif

}

return ctx;
}

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Editing: flagcb.c

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