Update ICU to ICU 70-1 with tests

Size Impact:
Android   +143K
Cast      -143K
ChromeOS  -154.7K
Common    -159K
flutter   -123.1K
iOS       -157.6K
Diary https://docs.google.com/document/d/1NqMw7DAVFCZRx67auC7sgOvrikHvCYuaB87JUf21yG8

Bug: 1260116
Change-Id: I90102bf8c5a9d54a59658b2d2f7fb25b405917ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/3268349
Reviewed-by: Jungshik Shin <jshin@chromium.org>
diff --git a/source/test/intltest/convtest.cpp b/source/test/intltest/convtest.cpp
new file mode 100644
index 0000000..ee421de
--- /dev/null
+++ b/source/test/intltest/convtest.cpp
@@ -0,0 +1,1866 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+*
+*   Copyright (C) 2003-2014, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+*******************************************************************************
+*   file name:  convtest.cpp
+*   encoding:   UTF-8
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2003jul15
+*   created by: Markus W. Scherer
+*
+*   Test file for data-driven conversion tests.
+*/
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_LEGACY_CONVERSION
+/*
+ * Note: Turning off all of convtest.cpp if !UCONFIG_NO_LEGACY_CONVERSION
+ * is slightly unnecessary - it removes tests for Unicode charsets
+ * like UTF-8 that should work.
+ * However, there is no easy way for the test to detect whether a test case
+ * is for a Unicode charset, so it would be difficult to only exclude those.
+ * Also, regular testing of ICU is done with all modules on, therefore
+ * not testing conversion for a custom configuration like this should be ok.
+ */
+
+#include "unicode/ucnv.h"
+#include "unicode/unistr.h"
+#include "unicode/parsepos.h"
+#include "unicode/uniset.h"
+#include "unicode/usetiter.h"
+#include "unicode/ustring.h"
+#include "unicode/ures.h"
+#include "unicode/utf16.h"
+#include "convtest.h"
+#include "cmemory.h"
+#include "unicode/tstdtmod.h"
+#include <string.h>
+#include <stdlib.h>
+
+enum {
+    // characters used in test data for callbacks
+    SUB_CB='?',
+    SKIP_CB='0',
+    STOP_CB='.',
+    ESC_CB='&'
+};
+
+ConversionTest::ConversionTest() {
+    UErrorCode errorCode=U_ZERO_ERROR;
+    utf8Cnv=ucnv_open("UTF-8", &errorCode);
+    ucnv_setToUCallBack(utf8Cnv, UCNV_TO_U_CALLBACK_STOP, NULL, NULL, NULL, &errorCode);
+    if(U_FAILURE(errorCode)) {
+        errln("unable to open UTF-8 converter");
+    }
+}
+
+ConversionTest::~ConversionTest() {
+    ucnv_close(utf8Cnv);
+}
+
+void
+ConversionTest::runIndexedTest(int32_t index, UBool exec, const char *&name, char * /*par*/) {
+    if (exec) logln("TestSuite ConversionTest: ");
+    TESTCASE_AUTO_BEGIN;
+#if !UCONFIG_NO_FILE_IO
+    TESTCASE_AUTO(TestToUnicode);
+    TESTCASE_AUTO(TestFromUnicode);
+    TESTCASE_AUTO(TestGetUnicodeSet);
+#endif
+    TESTCASE_AUTO(TestGetUnicodeSet2);
+    TESTCASE_AUTO(TestDefaultIgnorableCallback);
+    TESTCASE_AUTO(TestUTF8ToUTF8Overflow);
+    TESTCASE_AUTO(TestUTF8ToUTF8Streaming);
+    TESTCASE_AUTO_END;
+}
+
+// test data interface ----------------------------------------------------- ***
+
+void
+ConversionTest::TestToUnicode() {
+    ConversionCase cc;
+    char charset[100], cbopt[4];
+    const char *option;
+    UnicodeString s, unicode;
+    int32_t offsetsLength;
+    UConverterToUCallback callback;
+
+    TestDataModule *dataModule;
+    TestData *testData;
+    const DataMap *testCase;
+    UErrorCode errorCode;
+    int32_t i;
+
+    errorCode=U_ZERO_ERROR;
+    dataModule=TestDataModule::getTestDataModule("conversion", *this, errorCode);
+    if(U_SUCCESS(errorCode)) {
+        testData=dataModule->createTestData("toUnicode", errorCode);
+        if(U_SUCCESS(errorCode)) {
+            for(i=0; testData->nextCase(testCase, errorCode); ++i) {
+                if(U_FAILURE(errorCode)) {
+                    errln("error retrieving conversion/toUnicode test case %d - %s",
+                            i, u_errorName(errorCode));
+                    errorCode=U_ZERO_ERROR;
+                    continue;
+                }
+
+                cc.caseNr=i;
+
+                s=testCase->getString("charset", errorCode);
+                s.extract(0, 0x7fffffff, charset, sizeof(charset), "");
+                cc.charset=charset;
+
+                cc.bytes=testCase->getBinary(cc.bytesLength, "bytes", errorCode);
+                unicode=testCase->getString("unicode", errorCode);
+                cc.unicode=unicode.getBuffer();
+                cc.unicodeLength=unicode.length();
+
+                offsetsLength=0;
+                cc.offsets=testCase->getIntVector(offsetsLength, "offsets", errorCode);
+                if(offsetsLength==0) {
+                    cc.offsets=NULL;
+                } else if(offsetsLength!=unicode.length()) {
+                    errln("toUnicode[%d] unicode[%d] and offsets[%d] must have the same length",
+                            i, unicode.length(), offsetsLength);
+                    errorCode=U_ILLEGAL_ARGUMENT_ERROR;
+                }
+
+                cc.finalFlush= 0!=testCase->getInt28("flush", errorCode);
+                cc.fallbacks= 0!=testCase->getInt28("fallbacks", errorCode);
+
+                s=testCase->getString("errorCode", errorCode);
+                if(s==UNICODE_STRING("invalid", 7)) {
+                    cc.outErrorCode=U_INVALID_CHAR_FOUND;
+                } else if(s==UNICODE_STRING("illegal", 7)) {
+                    cc.outErrorCode=U_ILLEGAL_CHAR_FOUND;
+                } else if(s==UNICODE_STRING("truncated", 9)) {
+                    cc.outErrorCode=U_TRUNCATED_CHAR_FOUND;
+                } else if(s==UNICODE_STRING("illesc", 6)) {
+                    cc.outErrorCode=U_ILLEGAL_ESCAPE_SEQUENCE;
+                } else if(s==UNICODE_STRING("unsuppesc", 9)) {
+                    cc.outErrorCode=U_UNSUPPORTED_ESCAPE_SEQUENCE;
+                } else {
+                    cc.outErrorCode=U_ZERO_ERROR;
+                }
+
+                s=testCase->getString("callback", errorCode);
+                s.extract(0, 0x7fffffff, cbopt, sizeof(cbopt), "");
+                cc.cbopt=cbopt;
+                switch(cbopt[0]) {
+                case SUB_CB:
+                    callback=UCNV_TO_U_CALLBACK_SUBSTITUTE;
+                    break;
+                case SKIP_CB:
+                    callback=UCNV_TO_U_CALLBACK_SKIP;
+                    break;
+                case STOP_CB:
+                    callback=UCNV_TO_U_CALLBACK_STOP;
+                    break;
+                case ESC_CB:
+                    callback=UCNV_TO_U_CALLBACK_ESCAPE;
+                    break;
+                default:
+                    callback=NULL;
+                    break;
+                }
+                option=callback==NULL ? cbopt : cbopt+1;
+                if(*option==0) {
+                    option=NULL;
+                }
+
+                cc.invalidChars=testCase->getBinary(cc.invalidLength, "invalidChars", errorCode);
+
+                if(U_FAILURE(errorCode)) {
+                    errln("error parsing conversion/toUnicode test case %d - %s",
+                            i, u_errorName(errorCode));
+                    errorCode=U_ZERO_ERROR;
+                } else {
+                    logln("TestToUnicode[%d] %s", i, charset);
+                    ToUnicodeCase(cc, callback, option);
+                }
+            }
+            delete testData;
+        }
+        delete dataModule;
+    }
+    else {
+        dataerrln("Could not load test conversion data");
+    }
+}
+
+void
+ConversionTest::TestFromUnicode() {
+    ConversionCase cc;
+    char charset[100], cbopt[4];
+    const char *option;
+    UnicodeString s, unicode, invalidUChars;
+    int32_t offsetsLength, index;
+    UConverterFromUCallback callback;
+
+    TestDataModule *dataModule;
+    TestData *testData;
+    const DataMap *testCase;
+    const UChar *p;
+    UErrorCode errorCode;
+    int32_t i, length;
+
+    errorCode=U_ZERO_ERROR;
+    dataModule=TestDataModule::getTestDataModule("conversion", *this, errorCode);
+    if(U_SUCCESS(errorCode)) {
+        testData=dataModule->createTestData("fromUnicode", errorCode);
+        if(U_SUCCESS(errorCode)) {
+            for(i=0; testData->nextCase(testCase, errorCode); ++i) {
+                if(U_FAILURE(errorCode)) {
+                    errln("error retrieving conversion/fromUnicode test case %d - %s",
+                            i, u_errorName(errorCode));
+                    errorCode=U_ZERO_ERROR;
+                    continue;
+                }
+
+                cc.caseNr=i;
+
+                s=testCase->getString("charset", errorCode);
+                s.extract(0, 0x7fffffff, charset, sizeof(charset), "");
+                cc.charset=charset;
+
+                unicode=testCase->getString("unicode", errorCode);
+                cc.unicode=unicode.getBuffer();
+                cc.unicodeLength=unicode.length();
+                cc.bytes=testCase->getBinary(cc.bytesLength, "bytes", errorCode);
+
+                offsetsLength=0;
+                cc.offsets=testCase->getIntVector(offsetsLength, "offsets", errorCode);
+                if(offsetsLength==0) {
+                    cc.offsets=NULL;
+                } else if(offsetsLength!=cc.bytesLength) {
+                    errln("fromUnicode[%d] bytes[%d] and offsets[%d] must have the same length",
+                            i, cc.bytesLength, offsetsLength);
+                    errorCode=U_ILLEGAL_ARGUMENT_ERROR;
+                }
+
+                cc.finalFlush= 0!=testCase->getInt28("flush", errorCode);
+                cc.fallbacks= 0!=testCase->getInt28("fallbacks", errorCode);
+
+                s=testCase->getString("errorCode", errorCode);
+                if(s==UNICODE_STRING("invalid", 7)) {
+                    cc.outErrorCode=U_INVALID_CHAR_FOUND;
+                } else if(s==UNICODE_STRING("illegal", 7)) {
+                    cc.outErrorCode=U_ILLEGAL_CHAR_FOUND;
+                } else if(s==UNICODE_STRING("truncated", 9)) {
+                    cc.outErrorCode=U_TRUNCATED_CHAR_FOUND;
+                } else {
+                    cc.outErrorCode=U_ZERO_ERROR;
+                }
+
+                s=testCase->getString("callback", errorCode);
+                cc.setSub=0; // default: no subchar
+
+                if((index=s.indexOf((UChar)0))>0) {
+                    // read NUL-separated subchar first, if any
+                    // copy the subchar from Latin-1 characters
+                    // start after the NUL
+                    p=s.getTerminatedBuffer();
+                    length=index+1;
+                    p+=length;
+                    length=s.length()-length;
+                    if(length<=0 || length>=(int32_t)sizeof(cc.subchar)) {
+                        errorCode=U_ILLEGAL_ARGUMENT_ERROR;
+                    } else {
+                        int32_t j;
+
+                        for(j=0; j<length; ++j) {
+                            cc.subchar[j]=(char)p[j];
+                        }
+                        // NUL-terminate the subchar
+                        cc.subchar[j]=0;
+                        cc.setSub=1;
+                    }
+
+                    // remove the NUL and subchar from s
+                    s.truncate(index);
+                } else if((index=s.indexOf((UChar)0x3d))>0) /* '=' */ {
+                    // read a substitution string, separated by an equal sign
+                    p=s.getBuffer()+index+1;
+                    length=s.length()-(index+1);
+                    if(length<0 || length>=UPRV_LENGTHOF(cc.subString)) {
+                        errorCode=U_ILLEGAL_ARGUMENT_ERROR;
+                    } else {
+                        u_memcpy(cc.subString, p, length);
+                        // NUL-terminate the subString
+                        cc.subString[length]=0;
+                        cc.setSub=-1;
+                    }
+
+                    // remove the equal sign and subString from s
+                    s.truncate(index);
+                }
+
+                s.extract(0, 0x7fffffff, cbopt, sizeof(cbopt), "");
+                cc.cbopt=cbopt;
+                switch(cbopt[0]) {
+                case SUB_CB:
+                    callback=UCNV_FROM_U_CALLBACK_SUBSTITUTE;
+                    break;
+                case SKIP_CB:
+                    callback=UCNV_FROM_U_CALLBACK_SKIP;
+                    break;
+                case STOP_CB:
+                    callback=UCNV_FROM_U_CALLBACK_STOP;
+                    break;
+                case ESC_CB:
+                    callback=UCNV_FROM_U_CALLBACK_ESCAPE;
+                    break;
+                default:
+                    callback=NULL;
+                    break;
+                }
+                option=callback==NULL ? cbopt : cbopt+1;
+                if(*option==0) {
+                    option=NULL;
+                }
+
+                invalidUChars=testCase->getString("invalidUChars", errorCode);
+                cc.invalidUChars=invalidUChars.getBuffer();
+                cc.invalidLength=invalidUChars.length();
+
+                if(U_FAILURE(errorCode)) {
+                    errln("error parsing conversion/fromUnicode test case %d - %s",
+                            i, u_errorName(errorCode));
+                    errorCode=U_ZERO_ERROR;
+                } else {
+                    logln("TestFromUnicode[%d] %s", i, charset);
+                    FromUnicodeCase(cc, callback, option);
+                }
+            }
+            delete testData;
+        }
+        delete dataModule;
+    }
+    else {
+        dataerrln("Could not load test conversion data");
+    }
+}
+
+static const UChar ellipsis[]={ 0x2e, 0x2e, 0x2e };
+
+void
+ConversionTest::TestGetUnicodeSet() {
+    char charset[100];
+    UnicodeString s, map, mapnot;
+    int32_t which;
+
+    ParsePosition pos;
+    UnicodeSet cnvSet, mapSet, mapnotSet, diffSet;
+    UnicodeSet *cnvSetPtr = &cnvSet;
+    LocalUConverterPointer cnv;
+
+    TestDataModule *dataModule;
+    TestData *testData;
+    const DataMap *testCase;
+    UErrorCode errorCode;
+    int32_t i;
+
+    errorCode=U_ZERO_ERROR;
+    dataModule=TestDataModule::getTestDataModule("conversion", *this, errorCode);
+    if(U_SUCCESS(errorCode)) {
+        testData=dataModule->createTestData("getUnicodeSet", errorCode);
+        if(U_SUCCESS(errorCode)) {
+            for(i=0; testData->nextCase(testCase, errorCode); ++i) {
+                if(U_FAILURE(errorCode)) {
+                    errln("error retrieving conversion/getUnicodeSet test case %d - %s",
+                            i, u_errorName(errorCode));
+                    errorCode=U_ZERO_ERROR;
+                    continue;
+                }
+
+                s=testCase->getString("charset", errorCode);
+                s.extract(0, 0x7fffffff, charset, sizeof(charset), "");
+
+                map=testCase->getString("map", errorCode);
+                mapnot=testCase->getString("mapnot", errorCode);
+
+                which=testCase->getInt28("which", errorCode);
+
+                if(U_FAILURE(errorCode)) {
+                    errln("error parsing conversion/getUnicodeSet test case %d - %s",
+                            i, u_errorName(errorCode));
+                    errorCode=U_ZERO_ERROR;
+                    continue;
+                }
+
+                // test this test case
+                mapSet.clear();
+                mapnotSet.clear();
+
+                pos.setIndex(0);
+                mapSet.applyPattern(map, pos, 0, NULL, errorCode);
+                if(U_FAILURE(errorCode) || pos.getIndex()!=map.length()) {
+                    errln("error creating the map set for conversion/getUnicodeSet test case %d - %s\n"
+                          "    error index %d  index %d  U+%04x",
+                            i, u_errorName(errorCode), pos.getErrorIndex(), pos.getIndex(), map.char32At(pos.getIndex()));
+                    errorCode=U_ZERO_ERROR;
+                    continue;
+                }
+
+                pos.setIndex(0);
+                mapnotSet.applyPattern(mapnot, pos, 0, NULL, errorCode);
+                if(U_FAILURE(errorCode) || pos.getIndex()!=mapnot.length()) {
+                    errln("error creating the mapnot set for conversion/getUnicodeSet test case %d - %s\n"
+                          "    error index %d  index %d  U+%04x",
+                            i, u_errorName(errorCode), pos.getErrorIndex(), pos.getIndex(), mapnot.char32At(pos.getIndex()));
+                    errorCode=U_ZERO_ERROR;
+                    continue;
+                }
+
+                logln("TestGetUnicodeSet[%d] %s", i, charset);
+
+                cnv.adoptInstead(cnv_open(charset, errorCode));
+                if(U_FAILURE(errorCode)) {
+                    errcheckln(errorCode, "error opening \"%s\" for conversion/getUnicodeSet test case %d - %s",
+                            charset, i, u_errorName(errorCode));
+                    errorCode=U_ZERO_ERROR;
+                    continue;
+                }
+
+                ucnv_getUnicodeSet(cnv.getAlias(), cnvSetPtr->toUSet(), (UConverterUnicodeSet)which, &errorCode);
+
+                if(U_FAILURE(errorCode)) {
+                    errln("error in ucnv_getUnicodeSet(\"%s\") for conversion/getUnicodeSet test case %d - %s",
+                            charset, i, u_errorName(errorCode));
+                    errorCode=U_ZERO_ERROR;
+                    continue;
+                }
+
+                // are there items that must be in cnvSet but are not?
+                (diffSet=mapSet).removeAll(cnvSet);
+                if(!diffSet.isEmpty()) {
+                    diffSet.toPattern(s, TRUE);
+                    if(s.length()>100) {
+                        s.replace(100, 0x7fffffff, ellipsis, UPRV_LENGTHOF(ellipsis));
+                    }
+                    errln("error: ucnv_getUnicodeSet(\"%s\") is missing items - conversion/getUnicodeSet test case %d",
+                            charset, i);
+                    errln(s);
+                }
+
+                // are there items that must not be in cnvSet but are?
+                (diffSet=mapnotSet).retainAll(cnvSet);
+                if(!diffSet.isEmpty()) {
+                    diffSet.toPattern(s, TRUE);
+                    if(s.length()>100) {
+                        s.replace(100, 0x7fffffff, ellipsis, UPRV_LENGTHOF(ellipsis));
+                    }
+                    errln("error: ucnv_getUnicodeSet(\"%s\") contains unexpected items - conversion/getUnicodeSet test case %d",
+                            charset, i);
+                    errln(s);
+                }
+            }
+            delete testData;
+        }
+        delete dataModule;
+    }
+    else {
+        dataerrln("Could not load test conversion data");
+    }
+}
+
+U_CDECL_BEGIN
+static void U_CALLCONV
+getUnicodeSetCallback(const void *context,
+                      UConverterFromUnicodeArgs * /*fromUArgs*/,
+                      const UChar* /*codeUnits*/,
+                      int32_t /*length*/,
+                      UChar32 codePoint,
+                      UConverterCallbackReason reason,
+                      UErrorCode *pErrorCode) {
+    if(reason<=UCNV_IRREGULAR) {
+        ((UnicodeSet *)context)->remove(codePoint);  // the converter cannot convert this code point
+        *pErrorCode=U_ZERO_ERROR;                    // skip
+    }  // else ignore the reset, close and clone calls.
+}
+U_CDECL_END
+
+// Compare ucnv_getUnicodeSet() with the set of characters that can be converted.
+void
+ConversionTest::TestGetUnicodeSet2() {
+    // Build a string with all code points.
+    UChar32 cpLimit;
+    int32_t s0Length;
+    if(quick) {
+        cpLimit=s0Length=0x10000;  // BMP only
+    } else {
+        cpLimit=0x110000;
+        s0Length=0x10000+0x200000;  // BMP + surrogate pairs
+    }
+    UChar *s0=new UChar[s0Length];
+    if(s0==NULL) {
+        return;
+    }
+    UChar *s=s0;
+    UChar32 c;
+    UChar c2;
+    // low BMP
+    for(c=0; c<=0xd7ff; ++c) {
+        *s++=(UChar)c;
+    }
+    // trail surrogates
+    for(c=0xdc00; c<=0xdfff; ++c) {
+        *s++=(UChar)c;
+    }
+    // lead surrogates
+    // (after trails so that there is not even one surrogate pair in between)
+    for(c=0xd800; c<=0xdbff; ++c) {
+        *s++=(UChar)c;
+    }
+    // high BMP
+    for(c=0xe000; c<=0xffff; ++c) {
+        *s++=(UChar)c;
+    }
+    // supplementary code points = surrogate pairs
+    if(cpLimit==0x110000) {
+        for(c=0xd800; c<=0xdbff; ++c) {
+            for(c2=0xdc00; c2<=0xdfff; ++c2) {
+                *s++=(UChar)c;
+                *s++=c2;
+            }
+        }
+    }
+
+    static const char *const cnvNames[]={
+        "UTF-8",
+        "UTF-7",
+        "UTF-16",
+        "US-ASCII",
+        "ISO-8859-1",
+        "windows-1252",
+        "Shift-JIS",
+        "ibm-1390",  // EBCDIC_STATEFUL table
+        "ibm-16684",  // DBCS-only extension table based on EBCDIC_STATEFUL table
+        "HZ",
+        "ISO-2022-JP",
+        "JIS7",
+        "ISO-2022-CN",
+        "ISO-2022-CN-EXT",
+        "LMBCS"
+    };
+    LocalUConverterPointer cnv;
+    char buffer[1024];
+    int32_t i;
+    for(i=0; i<UPRV_LENGTHOF(cnvNames); ++i) {
+        UErrorCode errorCode=U_ZERO_ERROR;
+        cnv.adoptInstead(cnv_open(cnvNames[i], errorCode));
+        if(U_FAILURE(errorCode)) {
+            errcheckln(errorCode, "failed to open converter %s - %s", cnvNames[i], u_errorName(errorCode));
+            continue;
+        }
+        UnicodeSet expected;
+        ucnv_setFromUCallBack(cnv.getAlias(), getUnicodeSetCallback, &expected, NULL, NULL, &errorCode);
+        if(U_FAILURE(errorCode)) {
+            errln("failed to set the callback on converter %s - %s", cnvNames[i], u_errorName(errorCode));
+            continue;
+        }
+        UConverterUnicodeSet which;
+        for(which=UCNV_ROUNDTRIP_SET; which<UCNV_SET_COUNT; which=(UConverterUnicodeSet)((int)which+1)) {
+            if(which==UCNV_ROUNDTRIP_AND_FALLBACK_SET) {
+                ucnv_setFallback(cnv.getAlias(), TRUE);
+            }
+            expected.add(0, cpLimit-1);
+            s=s0;
+            UBool flush;
+            do {
+                char *t=buffer;
+                flush=(UBool)(s==s0+s0Length);
+                ucnv_fromUnicode(cnv.getAlias(), &t, buffer+sizeof(buffer), (const UChar **)&s, s0+s0Length, NULL, flush, &errorCode);
+                if(U_FAILURE(errorCode)) {
+                    if(errorCode==U_BUFFER_OVERFLOW_ERROR) {
+                        errorCode=U_ZERO_ERROR;
+                        continue;
+                    } else {
+                        break;  // unexpected error, should not occur
+                    }
+                }
+            } while(!flush);
+            UnicodeSet set;
+            ucnv_getUnicodeSet(cnv.getAlias(), set.toUSet(), which, &errorCode);
+            if(cpLimit<0x110000) {
+                set.remove(cpLimit, 0x10ffff);
+            }
+            if(which==UCNV_ROUNDTRIP_SET) {
+                // ignore PUA code points because they will be converted even if they
+                // are fallbacks and when other fallbacks are turned off,
+                // but ucnv_getUnicodeSet(UCNV_ROUNDTRIP_SET) delivers true roundtrips
+                expected.remove(0xe000, 0xf8ff);
+                expected.remove(0xf0000, 0xffffd);
+                expected.remove(0x100000, 0x10fffd);
+                set.remove(0xe000, 0xf8ff);
+                set.remove(0xf0000, 0xffffd);
+                set.remove(0x100000, 0x10fffd);
+            }
+            if(set!=expected) {
+                // First try to see if we have different sets because ucnv_getUnicodeSet()
+                // added strings: The above conversion method does not tell us what strings might be convertible.
+                // Remove strings from the set and compare again.
+                set.removeAllStrings();
+            }
+            if(set!=expected) {
+                UnicodeSet diffSet;
+                UnicodeString out;
+
+                // are there items that must be in the set but are not?
+                (diffSet=expected).removeAll(set);
+                if(!diffSet.isEmpty()) {
+                    diffSet.toPattern(out, TRUE);
+                    if(out.length()>100) {
+                        out.replace(100, 0x7fffffff, ellipsis, UPRV_LENGTHOF(ellipsis));
+                    }
+                    errln("error: ucnv_getUnicodeSet(\"%s\") is missing items - which set: %d",
+                            cnvNames[i], which);
+                    errln(out);
+                }
+
+                // are there items that must not be in the set but are?
+                (diffSet=set).removeAll(expected);
+                if(!diffSet.isEmpty()) {
+                    diffSet.toPattern(out, TRUE);
+                    if(out.length()>100) {
+                        out.replace(100, 0x7fffffff, ellipsis, UPRV_LENGTHOF(ellipsis));
+                    }
+                    errln("error: ucnv_getUnicodeSet(\"%s\") contains unexpected items - which set: %d",
+                            cnvNames[i], which);
+                    errln(out);
+                }
+            }
+        }
+    }
+
+    delete [] s0;
+}
+
+// Test that all code points which have the default ignorable Unicode property
+// are ignored if they have no mapping.
+// If there are any failures, the hard coded list (IS_DEFAULT_IGNORABLE_CODE_POINT)
+// in ucnv_err.cpp should be updated.
+void
+ConversionTest::TestDefaultIgnorableCallback() {
+    UErrorCode status = U_ZERO_ERROR;
+    const char *cnv_name = "euc-jp-2007";
+    const char *pattern_ignorable = "[:Default_Ignorable_Code_Point:]";
+    const char *pattern_not_ignorable =
+        "[[:^Default_Ignorable_Code_Point:]"
+        // For test performance, skip large ranges that will likely remain unassigned
+        // for a long time, and private use code points.
+        "-[\\U00040000-\\U000DFFFF]-[:Co:]"
+        "]";
+
+    LocalPointer<UnicodeSet> set_ignorable(new UnicodeSet(pattern_ignorable, status));
+    if (U_FAILURE(status)) {
+        dataerrln("Unable to create Unicodeset: %s - %s\n", pattern_ignorable, u_errorName(status));
+        return;
+    }
+
+    LocalPointer<UnicodeSet> set_not_ignorable(new UnicodeSet(pattern_not_ignorable, status));
+    if (U_FAILURE(status)) {
+        dataerrln("Unable to create Unicodeset: %s - %s\n", pattern_not_ignorable, u_errorName(status));
+        return;
+    }
+
+    LocalUConverterPointer cnv(cnv_open(cnv_name, status));
+    if (U_FAILURE(status)) {
+        dataerrln("Unable to open converter: %s - %s\n", cnv_name, u_errorName(status));
+        return;
+    }
+
+    // set callback for the converter 
+    ucnv_setFromUCallBack(cnv.getAlias(), UCNV_FROM_U_CALLBACK_SUBSTITUTE, NULL, NULL, NULL, &status);
+
+    UChar32 input[1];
+    char output[10];
+    int32_t outputLength;
+    
+    // test default ignorables are ignored
+    UnicodeSetIterator iter(*set_ignorable);
+    while (iter.next()) {
+        status = U_ZERO_ERROR;
+        outputLength= 0;
+
+        input[0] = iter.getCodepoint();
+
+        outputLength = ucnv_fromUChars(cnv.getAlias(), output, 10, UnicodeString::fromUTF32(input, 1).getTerminatedBuffer(), -1, &status);
+        if (U_FAILURE(status) || outputLength != 0) {
+            errln("Ignorable code point: U+%04X not skipped as expected - %s", input[0], u_errorName(status));
+        }
+    }
+
+    // test non-ignorables are not ignored
+    iter.reset(*set_not_ignorable);
+    while (iter.next()) {
+        status = U_ZERO_ERROR;
+        outputLength= 0;
+
+        input[0] = iter.getCodepoint();
+
+        if (input[0] == 0) {
+            continue;
+        }
+
+        outputLength = ucnv_fromUChars(cnv.getAlias(), output, 10, UnicodeString::fromUTF32(input, 1).getTerminatedBuffer(), -1, &status);
+        if (U_FAILURE(status) || outputLength <= 0) {
+            errln("Non-ignorable code point: U+%04X skipped unexpectedly - %s", input[0], u_errorName(status));
+        }
+    }
+}
+
+void
+ConversionTest::TestUTF8ToUTF8Overflow() {
+    IcuTestErrorCode errorCode(*this, "TestUTF8ToUTF8Overflow");
+    LocalUConverterPointer cnv1(ucnv_open("UTF-8", errorCode));
+    LocalUConverterPointer cnv2(ucnv_open("UTF-8", errorCode));
+    static const char *text = "aä";  // ä: 2 bytes
+    const char *source = text;
+    const char *sourceLimit = text + strlen(text);
+    char result[20];
+    char *target = result;
+    const char *targetLimit = result + sizeof(result);
+    UChar buffer16[20];
+    UChar *pivotSource = buffer16;
+    UChar *pivotTarget = buffer16;
+    const UChar *pivotLimit = buffer16 + UPRV_LENGTHOF(buffer16);
+    int32_t length;
+
+    // Convert with insufficient target capacity.
+    result[2] = 5;
+    ucnv_convertEx(cnv2.getAlias(), cnv1.getAlias(),
+                   &target, result + 2, &source, sourceLimit,
+                   buffer16, &pivotSource, &pivotTarget, pivotLimit,
+                   FALSE, FALSE, errorCode);
+    assertEquals("overflow", U_BUFFER_OVERFLOW_ERROR, errorCode.reset());
+    length = (int32_t)(target - result);
+    assertEquals("number of bytes written", 2, length);
+    assertEquals("next byte not clobbered", 5, result[2]);
+
+    // Convert the rest and flush.
+    ucnv_convertEx(cnv2.getAlias(), cnv1.getAlias(),
+                   &target, targetLimit, &source, sourceLimit,
+                   buffer16, &pivotSource, &pivotTarget, pivotLimit,
+                   FALSE, TRUE, errorCode);
+
+    assertSuccess("UTF-8->UTF-8", errorCode);
+    length = (int32_t)(target - result);
+    assertEquals("3 bytes", 3, length);
+    if (length == 3) {
+        assertTrue("result same as input", memcmp(text, result, length) == 0);
+    }
+
+    ucnv_reset(cnv1.getAlias());
+    ucnv_reset(cnv2.getAlias());
+    memset(result, 0, sizeof(result));
+    static const char *text2 = "a🚲";  // U+1F6B2 bicycle: 4 bytes
+    source = text2;
+    sourceLimit = text2 + strlen(text2);
+    target = result;
+    pivotSource = pivotTarget = buffer16;
+
+    // Convert with insufficient target capacity.
+    result[3] = 5;
+    ucnv_convertEx(cnv2.getAlias(), cnv1.getAlias(),
+                   &target, result + 3, &source, sourceLimit,
+                   buffer16, &pivotSource, &pivotTarget, pivotLimit,
+                   FALSE, FALSE, errorCode);
+    assertEquals("text2 overflow", U_BUFFER_OVERFLOW_ERROR, errorCode.reset());
+    length = (int32_t)(target - result);
+    assertEquals("text2 number of bytes written", 3, length);
+    assertEquals("text2 next byte not clobbered", 5, result[3]);
+
+    // Convert the rest and flush.
+    ucnv_convertEx(cnv2.getAlias(), cnv1.getAlias(),
+                   &target, targetLimit, &source, sourceLimit,
+                   buffer16, &pivotSource, &pivotTarget, pivotLimit,
+                   FALSE, TRUE, errorCode);
+
+    assertSuccess("text2 UTF-8->UTF-8", errorCode);
+    length = (int32_t)(target - result);
+    assertEquals("text2 5 bytes", 5, length);
+    if (length == 5) {
+        assertTrue("text2 result same as input", memcmp(text2, result, length) == 0);
+    }
+
+    ucnv_reset(cnv1.getAlias());
+    ucnv_reset(cnv2.getAlias());
+    memset(result, 0, sizeof(result));
+    static const char *illFormed = "\xf1\x91\x93\x96\x91\x94";  // U+514D6 + two more trail bytes
+    source = illFormed;
+    sourceLimit = illFormed + strlen(illFormed);
+    target = result;
+    pivotSource = pivotTarget = buffer16;
+
+    ucnv_setToUCallBack(cnv1.getAlias(), UCNV_TO_U_CALLBACK_STOP, nullptr, nullptr, nullptr, errorCode);
+
+    // Convert only two bytes and flush (but expect failure).
+    char errorBytes[10];
+    int8_t errorLength;
+    result[0] = 5;
+    ucnv_convertEx(cnv2.getAlias(), cnv1.getAlias(),
+                   &target, targetLimit, &source, source + 2,
+                   buffer16, &pivotSource, &pivotTarget, pivotLimit,
+                   FALSE, TRUE, errorCode);
+    assertEquals("illFormed truncated", U_TRUNCATED_CHAR_FOUND, errorCode.reset());
+    length = (int32_t)(target - result);
+    assertEquals("illFormed number of bytes written", 0, length);
+    errorLength = UPRV_LENGTHOF(errorBytes);
+    ucnv_getInvalidChars(cnv1.getAlias(), errorBytes, &errorLength, errorCode);
+    assertEquals("illFormed truncated errorLength", 2, (int32_t)errorLength);
+    if (errorLength == 2) {
+        assertEquals("illFormed truncated errorBytes", 0xf191, 
+                     ((int32_t)(uint8_t)errorBytes[0] << 8) | (uint8_t)errorBytes[1]);
+    }
+
+    // Continue conversion starting with a trail byte.
+    ucnv_convertEx(cnv2.getAlias(), cnv1.getAlias(),
+                   &target, targetLimit, &source, sourceLimit,
+                   buffer16, &pivotSource, &pivotTarget, pivotLimit,
+                   FALSE, TRUE, errorCode);
+
+    assertEquals("illFormed trail byte", U_ILLEGAL_CHAR_FOUND, errorCode.reset());
+    length = (int32_t)(target - result);
+    assertEquals("illFormed trail byte number of bytes written", 0, length);
+    errorLength = UPRV_LENGTHOF(errorBytes);
+    ucnv_getInvalidChars(cnv1.getAlias(), errorBytes, &errorLength, errorCode);
+    assertEquals("illFormed trail byte errorLength", 1, (int32_t)errorLength);
+    if (errorLength == 1) {
+        assertEquals("illFormed trail byte errorBytes", 0x93, (int32_t)(uint8_t)errorBytes[0]);
+    }
+}
+
+void
+ConversionTest::TestUTF8ToUTF8Streaming() {
+    IcuTestErrorCode errorCode(*this, "TestUTF8ToUTF8Streaming");
+    LocalUConverterPointer cnv1(ucnv_open("UTF-8", errorCode));
+    LocalUConverterPointer cnv2(ucnv_open("UTF-8", errorCode));
+
+    // UTF8 encoded cyrillic part of 'Lorem ipsum'
+    static const char* text =
+        "\xd0\xb5\xd1\x82\x20\xd1\x81\xd1\x86\xd0\xb0\xd0\xb5\xd0\xb2\xd0"
+        "\xbe\xd0\xbb\xd0\xb0\x20\xd1\x81\xd0\xb0\xd0\xb4\xd0\xb8\xd0\xbf"
+        "\xd1\x81\xd1\x86\xd0\xb8\xd0\xbd\xd0\xb3\x20\xd0\xb0\xd1\x86\xd1"
+        "\x86\xd0\xbe\xd0\xbc\xd0\xbc\xd0\xbe\xd0\xb4\xd0\xb0\xd1\x80\xd0"
+        "\xb5\x20\xd1\x85\xd0\xb0\xd1\x81";
+
+    int32_t chunk1 = 25; // partial lead at the end: 0xd0
+    int32_t chunk2 = 47; // partial tail at the beginning: 0xb0
+
+    char result[128];
+
+    int32_t sourceLen = (int32_t)strlen(text);
+    const char* source = text;
+    const char* sourceLimit = text + chunk1;
+
+    int32_t targetLen = sizeof(result);
+    char* target = result;
+    const char* targetLimit = result + targetLen;
+
+    UChar buffer16[20];
+    UChar* pivotSource = buffer16;
+    UChar* pivotTarget = buffer16;
+    const UChar* pivotLimit = buffer16 + UPRV_LENGTHOF(buffer16);
+
+    int32_t length;
+    ucnv_convertEx(cnv2.getAlias(), cnv1.getAlias(),
+        &target, result + targetLen, &source, sourceLimit,
+        buffer16, &pivotSource, &pivotTarget, pivotLimit,
+        FALSE, FALSE, errorCode);
+
+    length = (int32_t)(target - result);
+    targetLen -= length;
+    assertEquals("First chunk -1 doesn't match converted length", chunk1 - 1, length);
+
+    source = text + chunk1;
+    sourceLimit = source + chunk2;
+
+    // Convert the rest and flush.
+    ucnv_convertEx(cnv2.getAlias(), cnv1.getAlias(),
+        &target, targetLimit, &source, sourceLimit,
+        buffer16, &pivotSource, &pivotTarget, pivotLimit,
+        FALSE, TRUE, errorCode);
+
+    length = (int32_t)(target - result - length);
+    targetLen -= length;
+    assertEquals("Second chunk + 2 doesn't  match converted length", chunk2 + 1, length);
+
+    assertEquals("Full text length match", sourceLen, sizeof(result) - targetLen);
+    assertSuccess("UTF-8->UTF-8", errorCode);
+}
+
+// open testdata or ICU data converter ------------------------------------- ***
+
+UConverter *
+ConversionTest::cnv_open(const char *name, UErrorCode &errorCode) {
+    if(name!=NULL && *name=='+') {
+        // Converter names that start with '+' are ignored in ICU4J tests.
+        ++name;
+    }
+    if(name!=NULL && *name=='*') {
+        /* loadTestData(): set the data directory */
+        return ucnv_openPackage(loadTestData(errorCode), name+1, &errorCode);
+    } else {
+        return ucnv_open(name, &errorCode);
+    }
+}
+
+// output helpers ---------------------------------------------------------- ***
+
+static inline char
+hexDigit(uint8_t digit) {
+    return digit<=9 ? (char)('0'+digit) : (char)('a'-10+digit);
+}
+
+static char *
+printBytes(const uint8_t *bytes, int32_t length, char *out) {
+    uint8_t b;
+
+    if(length>0) {
+        b=*bytes++;
+        --length;
+        *out++=hexDigit((uint8_t)(b>>4));
+        *out++=hexDigit((uint8_t)(b&0xf));
+    }
+
+    while(length>0) {
+        b=*bytes++;
+        --length;
+        *out++=' ';
+        *out++=hexDigit((uint8_t)(b>>4));
+        *out++=hexDigit((uint8_t)(b&0xf));
+    }
+    *out++=0;
+    return out;
+}
+
+static char *
+printUnicode(const UChar *unicode, int32_t length, char *out) {
+    UChar32 c;
+    int32_t i;
+
+    for(i=0; i<length;) {
+        if(i>0) {
+            *out++=' ';
+        }
+        U16_NEXT(unicode, i, length, c);
+        // write 4..6 digits
+        if(c>=0x100000) {
+            *out++='1';
+        }
+        if(c>=0x10000) {
+            *out++=hexDigit((uint8_t)((c>>16)&0xf));
+        }
+        *out++=hexDigit((uint8_t)((c>>12)&0xf));
+        *out++=hexDigit((uint8_t)((c>>8)&0xf));
+        *out++=hexDigit((uint8_t)((c>>4)&0xf));
+        *out++=hexDigit((uint8_t)(c&0xf));
+    }
+    *out++=0;
+    return out;
+}
+
+static char *
+printOffsets(const int32_t *offsets, int32_t length, char *out) {
+    int32_t i, o, d;
+
+    if(offsets==NULL) {
+        length=0;
+    }
+
+    for(i=0; i<length; ++i) {
+        if(i>0) {
+            *out++=' ';
+        }
+        o=offsets[i];
+
+        // print all offsets with 2 characters each (-x, -9..99, xx)
+        if(o<-9) {
+            *out++='-';
+            *out++='x';
+        } else if(o<0) {
+            *out++='-';
+            *out++=(char)('0'-o);
+        } else if(o<=99) {
+            *out++=(d=o/10)==0 ? ' ' : (char)('0'+d);
+            *out++=(char)('0'+o%10);
+        } else /* o>99 */ {
+            *out++='x';
+            *out++='x';
+        }
+    }
+    *out++=0;
+    return out;
+}
+
+// toUnicode test worker functions ----------------------------------------- ***
+
+static int32_t
+stepToUnicode(ConversionCase &cc, UConverter *cnv,
+              UChar *result, int32_t resultCapacity,
+              int32_t *resultOffsets, /* also resultCapacity */
+              int32_t step,
+              UErrorCode *pErrorCode) {
+    const char *source, *sourceLimit, *bytesLimit;
+    UChar *target, *targetLimit, *resultLimit;
+    UBool flush;
+
+    source=(const char *)cc.bytes;
+    target=result;
+    bytesLimit=source+cc.bytesLength;
+    resultLimit=result+resultCapacity;
+
+    if(step>=0) {
+        // call ucnv_toUnicode() with in/out buffers no larger than (step) at a time
+        // move only one buffer (in vs. out) at a time to be extra mean
+        // step==0 performs bulk conversion and generates offsets
+
+        // initialize the partial limits for the loop
+        if(step==0) {
+            // use the entire buffers
+            sourceLimit=bytesLimit;
+            targetLimit=resultLimit;
+            flush=cc.finalFlush;
+        } else {
+            // start with empty partial buffers
+            sourceLimit=source;
+            targetLimit=target;
+            flush=FALSE;
+
+            // output offsets only for bulk conversion
+            resultOffsets=NULL;
+        }
+
+        for(;;) {
+            // resetting the opposite conversion direction must not affect this one
+            ucnv_resetFromUnicode(cnv);
+
+            // convert
+            ucnv_toUnicode(cnv,
+                &target, targetLimit,
+                &source, sourceLimit,
+                resultOffsets,
+                flush, pErrorCode);
+
+            // check pointers and errors
+            if(source>sourceLimit || target>targetLimit) {
+                *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
+                break;
+            } else if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
+                if(target!=targetLimit) {
+                    // buffer overflow must only be set when the target is filled
+                    *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
+                    break;
+                } else if(targetLimit==resultLimit) {
+                    // not just a partial overflow
+                    break;
+                }
+
+                // the partial target is filled, set a new limit, reset the error and continue
+                targetLimit=(resultLimit-target)>=step ? target+step : resultLimit;
+                *pErrorCode=U_ZERO_ERROR;
+            } else if(U_FAILURE(*pErrorCode)) {
+                // some other error occurred, done
+                break;
+            } else {
+                if(source!=sourceLimit) {
+                    // when no error occurs, then the input must be consumed
+                    *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
+                    break;
+                }
+
+                if(sourceLimit==bytesLimit) {
+                    // we are done
+                    break;
+                }
+
+                // the partial conversion succeeded, set a new limit and continue
+                sourceLimit=(bytesLimit-source)>=step ? source+step : bytesLimit;
+                flush=(UBool)(cc.finalFlush && sourceLimit==bytesLimit);
+            }
+        }
+    } else /* step<0 */ {
+        /*
+         * step==-1: call only ucnv_getNextUChar()
+         * otherwise alternate between ucnv_toUnicode() and ucnv_getNextUChar()
+         *   if step==-2 or -3, then give ucnv_toUnicode() the whole remaining input,
+         *   else give it at most (-step-2)/2 bytes
+         */
+        UChar32 c;
+
+        // end the loop by getting an index out of bounds error
+        for(;;) {
+            // resetting the opposite conversion direction must not affect this one
+            ucnv_resetFromUnicode(cnv);
+
+            // convert
+            if((step&1)!=0 /* odd: -1, -3, -5, ... */) {
+                sourceLimit=source; // use sourceLimit not as a real limit
+                                    // but to remember the pre-getNextUChar source pointer
+                c=ucnv_getNextUChar(cnv, &source, bytesLimit, pErrorCode);
+
+                // check pointers and errors
+                if(*pErrorCode==U_INDEX_OUTOFBOUNDS_ERROR) {
+                    if(source!=bytesLimit) {
+                        *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
+                    } else {
+                        *pErrorCode=U_ZERO_ERROR;
+                    }
+                    break;
+                } else if(U_FAILURE(*pErrorCode)) {
+                    break;
+                }
+                // source may not move if c is from previous overflow
+
+                if(target==resultLimit) {
+                    *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
+                    break;
+                }
+                if(c<=0xffff) {
+                    *target++=(UChar)c;
+                } else {
+                    *target++=U16_LEAD(c);
+                    if(target==resultLimit) {
+                        *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
+                        break;
+                    }
+                    *target++=U16_TRAIL(c);
+                }
+
+                // alternate between -n-1 and -n but leave -1 alone
+                if(step<-1) {
+                    ++step;
+                }
+            } else /* step is even */ {
+                // allow only one UChar output
+                targetLimit=target<resultLimit ? target+1 : resultLimit;
+
+                // as with ucnv_getNextUChar(), we always flush (if we go to bytesLimit)
+                // and never output offsets
+                if(step==-2) {
+                    sourceLimit=bytesLimit;
+                } else {
+                    sourceLimit=source+(-step-2)/2;
+                    if(sourceLimit>bytesLimit) {
+                        sourceLimit=bytesLimit;
+                    }
+                }
+
+                ucnv_toUnicode(cnv,
+                    &target, targetLimit,
+                    &source, sourceLimit,
+                    NULL, (UBool)(sourceLimit==bytesLimit), pErrorCode);
+
+                // check pointers and errors
+                if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
+                    if(target!=targetLimit) {
+                        // buffer overflow must only be set when the target is filled
+                        *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
+                        break;
+                    } else if(targetLimit==resultLimit) {
+                        // not just a partial overflow
+                        break;
+                    }
+
+                    // the partial target is filled, set a new limit and continue
+                    *pErrorCode=U_ZERO_ERROR;
+                } else if(U_FAILURE(*pErrorCode)) {
+                    // some other error occurred, done
+                    break;
+                } else {
+                    if(source!=sourceLimit) {
+                        // when no error occurs, then the input must be consumed
+                        *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
+                        break;
+                    }
+
+                    // we are done (flush==TRUE) but we continue, to get the index out of bounds error above
+                }
+
+                --step;
+            }
+        }
+    }
+
+    return (int32_t)(target-result);
+}
+
+UBool
+ConversionTest::ToUnicodeCase(ConversionCase &cc, UConverterToUCallback callback, const char *option) {
+    // open the converter
+    IcuTestErrorCode errorCode(*this, "ToUnicodeCase");
+    LocalUConverterPointer cnv(cnv_open(cc.charset, errorCode));
+    // with no data, the above crashes with "pointer being freed was not allocated" for charset "x11-compound-text", see #13078
+    if(errorCode.isFailure()) {
+        errcheckln(errorCode, "toUnicode[%d](%s cb=\"%s\" fb=%d flush=%d) ucnv_open() failed - %s",
+                cc.caseNr, cc.charset, cc.cbopt, cc.fallbacks, cc.finalFlush, errorCode.errorName());
+        errorCode.reset();
+        return FALSE;
+    }
+
+    // set the callback
+    if(callback!=NULL) {
+        ucnv_setToUCallBack(cnv.getAlias(), callback, option, NULL, NULL, errorCode);
+        if(U_FAILURE(errorCode)) {
+            errln("toUnicode[%d](%s cb=\"%s\" fb=%d flush=%d) ucnv_setToUCallBack() failed - %s",
+                    cc.caseNr, cc.charset, cc.cbopt, cc.fallbacks, cc.finalFlush, u_errorName(errorCode));
+            return FALSE;
+        }
+    }
+
+    int32_t resultOffsets[256];
+    UChar result[256];
+    int32_t resultLength;
+    UBool ok;
+
+    static const struct {
+        int32_t step;
+        const char *name;
+    } steps[]={
+        { 0, "bulk" }, // must be first for offsets to be checked
+        { 1, "step=1" },
+        { 3, "step=3" },
+        { 7, "step=7" },
+        { -1, "getNext" },
+        { -2, "toU(bulk)+getNext" },
+        { -3, "getNext+toU(bulk)" },
+        { -4, "toU(1)+getNext" },
+        { -5, "getNext+toU(1)" },
+        { -12, "toU(5)+getNext" },
+        { -13, "getNext+toU(5)" },
+    };
+    int32_t i, step;
+
+    ok=TRUE;
+    for(i=0; i<UPRV_LENGTHOF(steps) && ok; ++i) {
+        step=steps[i].step;
+        if(step<0 && !cc.finalFlush) {
+            // skip ucnv_getNextUChar() if !finalFlush because
+            // ucnv_getNextUChar() always implies flush
+            continue;
+        }
+        if(step!=0) {
+            // bulk test is first, then offsets are not checked any more
+            cc.offsets=NULL;
+        }
+        else {
+            for (int32_t i = 0; i < UPRV_LENGTHOF(resultOffsets); i++) {
+                resultOffsets[i] = -1;
+            }
+        }
+        for (int32_t i = 0; i < UPRV_LENGTHOF(result); i++) {
+            result[i] = -1;
+        }
+        errorCode.reset();
+        resultLength=stepToUnicode(cc, cnv.getAlias(),
+                                result, UPRV_LENGTHOF(result),
+                                step==0 ? resultOffsets : NULL,
+                                step, errorCode);
+        ok=checkToUnicode(
+                cc, cnv.getAlias(), steps[i].name,
+                result, resultLength,
+                cc.offsets!=NULL ? resultOffsets : NULL,
+                errorCode);
+        if(errorCode.isFailure() || !cc.finalFlush) {
+            // reset if an error occurred or we did not flush
+            // otherwise do nothing to make sure that flushing resets
+            ucnv_resetToUnicode(cnv.getAlias());
+        }
+        if (cc.offsets != NULL && resultOffsets[resultLength] != -1) {
+            errln("toUnicode[%d](%s) Conversion wrote too much to offsets at index %d",
+                cc.caseNr, cc.charset, resultLength);
+        }
+        if (result[resultLength] != (UChar)-1) {
+            errln("toUnicode[%d](%s) Conversion wrote too much to result at index %d",
+                cc.caseNr, cc.charset, resultLength);
+        }
+    }
+
+    // not a real loop, just a convenience for breaking out of the block
+    while(ok && cc.finalFlush) {
+        // test ucnv_toUChars()
+        memset(result, 0, sizeof(result));
+
+        errorCode.reset();
+        resultLength=ucnv_toUChars(cnv.getAlias(),
+                        result, UPRV_LENGTHOF(result),
+                        (const char *)cc.bytes, cc.bytesLength,
+                        errorCode);
+        ok=checkToUnicode(
+                cc, cnv.getAlias(), "toUChars",
+                result, resultLength,
+                NULL,
+                errorCode);
+        if(!ok) {
+            break;
+        }
+
+        // test preflighting
+        // keep the correct result for simple checking
+        errorCode.reset();
+        resultLength=ucnv_toUChars(cnv.getAlias(),
+                        NULL, 0,
+                        (const char *)cc.bytes, cc.bytesLength,
+                        errorCode);
+        if(errorCode.get()==U_STRING_NOT_TERMINATED_WARNING || errorCode.get()==U_BUFFER_OVERFLOW_ERROR) {
+            errorCode.reset();
+        }
+        ok=checkToUnicode(
+                cc, cnv.getAlias(), "preflight toUChars",
+                result, resultLength,
+                NULL,
+                errorCode);
+        break;
+    }
+
+    errorCode.reset();  // all errors have already been reported
+    return ok;
+}
+
+UBool
+ConversionTest::checkToUnicode(ConversionCase &cc, UConverter *cnv, const char *name,
+                               const UChar *result, int32_t resultLength,
+                               const int32_t *resultOffsets,
+                               UErrorCode resultErrorCode) {
+    char resultInvalidChars[8];
+    int8_t resultInvalidLength;
+    UErrorCode errorCode;
+
+    const char *msg;
+
+    // reset the message; NULL will mean "ok"
+    msg=NULL;
+
+    errorCode=U_ZERO_ERROR;
+    resultInvalidLength=sizeof(resultInvalidChars);
+    ucnv_getInvalidChars(cnv, resultInvalidChars, &resultInvalidLength, &errorCode);
+    if(U_FAILURE(errorCode)) {
+        errln("toUnicode[%d](%s cb=\"%s\" fb=%d flush=%d %s) ucnv_getInvalidChars() failed - %s",
+                cc.caseNr, cc.charset, cc.cbopt, cc.fallbacks, cc.finalFlush, name, u_errorName(errorCode));
+        return FALSE;
+    }
+
+    // check everything that might have gone wrong
+    if(cc.unicodeLength!=resultLength) {
+        msg="wrong result length";
+    } else if(0!=u_memcmp(cc.unicode, result, cc.unicodeLength)) {
+        msg="wrong result string";
+    } else if(cc.offsets!=NULL && 0!=memcmp(cc.offsets, resultOffsets, cc.unicodeLength*sizeof(*cc.offsets))) {
+        msg="wrong offsets";
+    } else if(cc.outErrorCode!=resultErrorCode) {
+        msg="wrong error code";
+    } else if(cc.invalidLength!=resultInvalidLength) {
+        msg="wrong length of last invalid input";
+    } else if(0!=memcmp(cc.invalidChars, resultInvalidChars, cc.invalidLength)) {
+        msg="wrong last invalid input";
+    }
+
+    if(msg==NULL) {
+        return TRUE;
+    } else {
+        char buffer[2000]; // one buffer for all strings
+        char *s, *bytesString, *unicodeString, *resultString,
+            *offsetsString, *resultOffsetsString,
+            *invalidCharsString, *resultInvalidCharsString;
+
+        bytesString=s=buffer;
+        s=printBytes(cc.bytes, cc.bytesLength, bytesString);
+        s=printUnicode(cc.unicode, cc.unicodeLength, unicodeString=s);
+        s=printUnicode(result, resultLength, resultString=s);
+        s=printOffsets(cc.offsets, cc.unicodeLength, offsetsString=s);
+        s=printOffsets(resultOffsets, resultLength, resultOffsetsString=s);
+        s=printBytes(cc.invalidChars, cc.invalidLength, invalidCharsString=s);
+        s=printBytes((uint8_t *)resultInvalidChars, resultInvalidLength, resultInvalidCharsString=s);
+
+        if((s-buffer)>(int32_t)sizeof(buffer)) {
+            errln("toUnicode[%d](%s cb=\"%s\" fb=%d flush=%d %s) fatal error: checkToUnicode() test output buffer overflow writing %d chars\n",
+                    cc.caseNr, cc.charset, cc.cbopt, cc.fallbacks, cc.finalFlush, name, (int)(s-buffer));
+            exit(1);
+        }
+
+        errln("toUnicode[%d](%s cb=\"%s\" fb=%d flush=%d %s) failed: %s\n"
+              "  bytes <%s>[%d]\n"
+              " expected <%s>[%d]\n"
+              "  result  <%s>[%d]\n"
+              " offsets         <%s>\n"
+              "  result offsets <%s>\n"
+              " error code expected %s got %s\n"
+              "  invalidChars expected <%s> got <%s>\n",
+              cc.caseNr, cc.charset, cc.cbopt, cc.fallbacks, cc.finalFlush, name, msg,
+              bytesString, cc.bytesLength,
+              unicodeString, cc.unicodeLength,
+              resultString, resultLength,
+              offsetsString,
+              resultOffsetsString,
+              u_errorName(cc.outErrorCode), u_errorName(resultErrorCode),
+              invalidCharsString, resultInvalidCharsString);
+
+        return FALSE;
+    }
+}
+
+// fromUnicode test worker functions --------------------------------------- ***
+
+static int32_t
+stepFromUTF8(ConversionCase &cc,
+             UConverter *utf8Cnv, UConverter *cnv,
+             char *result, int32_t resultCapacity,
+             int32_t step,
+             UErrorCode *pErrorCode) {
+    const char *source, *sourceLimit, *utf8Limit;
+    UChar pivotBuffer[32];
+    UChar *pivotSource, *pivotTarget, *pivotLimit;
+    char *target, *targetLimit, *resultLimit;
+    UBool flush;
+
+    source=cc.utf8;
+    pivotSource=pivotTarget=pivotBuffer;
+    target=result;
+    utf8Limit=source+cc.utf8Length;
+    resultLimit=result+resultCapacity;
+
+    // call ucnv_convertEx() with in/out buffers no larger than (step) at a time
+    // move only one buffer (in vs. out) at a time to be extra mean
+    // step==0 performs bulk conversion
+
+    // initialize the partial limits for the loop
+    if(step==0) {
+        // use the entire buffers
+        sourceLimit=utf8Limit;
+        targetLimit=resultLimit;
+        flush=cc.finalFlush;
+
+        pivotLimit=pivotBuffer+UPRV_LENGTHOF(pivotBuffer);
+    } else {
+        // start with empty partial buffers
+        sourceLimit=source;
+        targetLimit=target;
+        flush=FALSE;
+
+        // empty pivot is not allowed, make it of length step
+        pivotLimit=pivotBuffer+step;
+    }
+
+    for(;;) {
+        // resetting the opposite conversion direction must not affect this one
+        ucnv_resetFromUnicode(utf8Cnv);
+        ucnv_resetToUnicode(cnv);
+
+        // convert
+        ucnv_convertEx(cnv, utf8Cnv,
+            &target, targetLimit,
+            &source, sourceLimit,
+            pivotBuffer, &pivotSource, &pivotTarget, pivotLimit,
+            FALSE, flush, pErrorCode);
+
+        // check pointers and errors
+        if(source>sourceLimit || target>targetLimit) {
+            *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
+            break;
+        } else if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
+            if(target!=targetLimit) {
+                // buffer overflow must only be set when the target is filled
+                *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
+                break;
+            } else if(targetLimit==resultLimit) {
+                // not just a partial overflow
+                break;
+            }
+
+            // the partial target is filled, set a new limit, reset the error and continue
+            targetLimit=(resultLimit-target)>=step ? target+step : resultLimit;
+            *pErrorCode=U_ZERO_ERROR;
+        } else if(U_FAILURE(*pErrorCode)) {
+            if(pivotSource==pivotBuffer) {
+                // toUnicode error, should not occur
+                // toUnicode errors are tested in cintltst TestConvertExFromUTF8()
+                break;
+            } else {
+                // fromUnicode error
+                // some other error occurred, done
+                break;
+            }
+        } else {
+            if(source!=sourceLimit) {
+                // when no error occurs, then the input must be consumed
+                *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
+                break;
+            }
+
+            if(sourceLimit==utf8Limit) {
+                // we are done
+                if(*pErrorCode==U_STRING_NOT_TERMINATED_WARNING) {
+                    // ucnv_convertEx() warns about not terminating the output
+                    // but ucnv_fromUnicode() does not and so
+                    // checkFromUnicode() does not expect it
+                    *pErrorCode=U_ZERO_ERROR;
+                }
+                break;
+            }
+
+            // the partial conversion succeeded, set a new limit and continue
+            sourceLimit=(utf8Limit-source)>=step ? source+step : utf8Limit;
+            flush=(UBool)(cc.finalFlush && sourceLimit==utf8Limit);
+        }
+    }
+
+    return (int32_t)(target-result);
+}
+
+static int32_t
+stepFromUnicode(ConversionCase &cc, UConverter *cnv,
+                char *result, int32_t resultCapacity,
+                int32_t *resultOffsets, /* also resultCapacity */
+                int32_t step,
+                UErrorCode *pErrorCode) {
+    const UChar *source, *sourceLimit, *unicodeLimit;
+    char *target, *targetLimit, *resultLimit;
+    UBool flush;
+
+    source=cc.unicode;
+    target=result;
+    unicodeLimit=source+cc.unicodeLength;
+    resultLimit=result+resultCapacity;
+
+    // call ucnv_fromUnicode() with in/out buffers no larger than (step) at a time
+    // move only one buffer (in vs. out) at a time to be extra mean
+    // step==0 performs bulk conversion and generates offsets
+
+    // initialize the partial limits for the loop
+    if(step==0) {
+        // use the entire buffers
+        sourceLimit=unicodeLimit;
+        targetLimit=resultLimit;
+        flush=cc.finalFlush;
+    } else {
+        // start with empty partial buffers
+        sourceLimit=source;
+        targetLimit=target;
+        flush=FALSE;
+
+        // output offsets only for bulk conversion
+        resultOffsets=NULL;
+    }
+
+    for(;;) {
+        // resetting the opposite conversion direction must not affect this one
+        ucnv_resetToUnicode(cnv);
+
+        // convert
+        ucnv_fromUnicode(cnv,
+            &target, targetLimit,
+            &source, sourceLimit,
+            resultOffsets,
+            flush, pErrorCode);
+
+        // check pointers and errors
+        if(source>sourceLimit || target>targetLimit) {
+            *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
+            break;
+        } else if(*pErrorCode==U_BUFFER_OVERFLOW_ERROR) {
+            if(target!=targetLimit) {
+                // buffer overflow must only be set when the target is filled
+                *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
+                break;
+            } else if(targetLimit==resultLimit) {
+                // not just a partial overflow
+                break;
+            }
+
+            // the partial target is filled, set a new limit, reset the error and continue
+            targetLimit=(resultLimit-target)>=step ? target+step : resultLimit;
+            *pErrorCode=U_ZERO_ERROR;
+        } else if(U_FAILURE(*pErrorCode)) {
+            // some other error occurred, done
+            break;
+        } else {
+            if(source!=sourceLimit) {
+                // when no error occurs, then the input must be consumed
+                *pErrorCode=U_INTERNAL_PROGRAM_ERROR;
+                break;
+            }
+
+            if(sourceLimit==unicodeLimit) {
+                // we are done
+                break;
+            }
+
+            // the partial conversion succeeded, set a new limit and continue
+            sourceLimit=(unicodeLimit-source)>=step ? source+step : unicodeLimit;
+            flush=(UBool)(cc.finalFlush && sourceLimit==unicodeLimit);
+        }
+    }
+
+    return (int32_t)(target-result);
+}
+
+UBool
+ConversionTest::FromUnicodeCase(ConversionCase &cc, UConverterFromUCallback callback, const char *option) {
+    UConverter *cnv;
+    UErrorCode errorCode;
+
+    // open the converter
+    errorCode=U_ZERO_ERROR;
+    cnv=cnv_open(cc.charset, errorCode);
+    if(U_FAILURE(errorCode)) {
+        errcheckln(errorCode, "fromUnicode[%d](%s cb=\"%s\" fb=%d flush=%d) ucnv_open() failed - %s",
+                cc.caseNr, cc.charset, cc.cbopt, cc.fallbacks, cc.finalFlush, u_errorName(errorCode));
+        return FALSE;
+    }
+    ucnv_resetToUnicode(utf8Cnv);
+
+    // set the callback
+    if(callback!=NULL) {
+        ucnv_setFromUCallBack(cnv, callback, option, NULL, NULL, &errorCode);
+        if(U_FAILURE(errorCode)) {
+            errln("fromUnicode[%d](%s cb=\"%s\" fb=%d flush=%d) ucnv_setFromUCallBack() failed - %s",
+                    cc.caseNr, cc.charset, cc.cbopt, cc.fallbacks, cc.finalFlush, u_errorName(errorCode));
+            ucnv_close(cnv);
+            return FALSE;
+        }
+    }
+
+    // set the fallbacks flag
+    // TODO change with Jitterbug 2401, then add a similar call for toUnicode too
+    ucnv_setFallback(cnv, cc.fallbacks);
+
+    // set the subchar
+    int32_t length;
+
+    if(cc.setSub>0) {
+        length=(int32_t)strlen(cc.subchar);
+        ucnv_setSubstChars(cnv, cc.subchar, (int8_t)length, &errorCode);
+        if(U_FAILURE(errorCode)) {
+            errln("fromUnicode[%d](%s cb=\"%s\" fb=%d flush=%d) ucnv_setSubstChars() failed - %s",
+                    cc.caseNr, cc.charset, cc.cbopt, cc.fallbacks, cc.finalFlush, u_errorName(errorCode));
+            ucnv_close(cnv);
+            return FALSE;
+        }
+    } else if(cc.setSub<0) {
+        ucnv_setSubstString(cnv, cc.subString, -1, &errorCode);
+        if(U_FAILURE(errorCode)) {
+            errln("fromUnicode[%d](%s cb=\"%s\" fb=%d flush=%d) ucnv_setSubstString() failed - %s",
+                    cc.caseNr, cc.charset, cc.cbopt, cc.fallbacks, cc.finalFlush, u_errorName(errorCode));
+            ucnv_close(cnv);
+            return FALSE;
+        }
+    }
+
+    // convert unicode to utf8
+    char utf8[256];
+    cc.utf8=utf8;
+    u_strToUTF8(utf8, UPRV_LENGTHOF(utf8), &cc.utf8Length,
+                cc.unicode, cc.unicodeLength,
+                &errorCode);
+    if(U_FAILURE(errorCode)) {
+        // skip UTF-8 testing of a string with an unpaired surrogate,
+        // or of one that's too long
+        // toUnicode errors are tested in cintltst TestConvertExFromUTF8()
+        cc.utf8Length=-1;
+    }
+
+    int32_t resultOffsets[256];
+    char result[256];
+    int32_t resultLength;
+    UBool ok;
+
+    static const struct {
+        int32_t step;
+        const char *name, *utf8Name;
+    } steps[]={
+        { 0, "bulk",   "utf8" }, // must be first for offsets to be checked
+        { 1, "step=1", "utf8 step=1" },
+        { 3, "step=3", "utf8 step=3" },
+        { 7, "step=7", "utf8 step=7" }
+    };
+    int32_t i, step;
+
+    ok=TRUE;
+    for(i=0; i<UPRV_LENGTHOF(steps) && ok; ++i) {
+        step=steps[i].step;
+        for (int32_t i = 0; i < UPRV_LENGTHOF(resultOffsets); i++) {
+            resultOffsets[i] = -1;
+        }
+        for (int32_t i = 0; i < UPRV_LENGTHOF(result); i++) {
+            result[i] = -1;
+        }
+        errorCode=U_ZERO_ERROR;
+        resultLength=stepFromUnicode(cc, cnv,
+                                result, UPRV_LENGTHOF(result),
+                                step==0 ? resultOffsets : NULL,
+                                step, &errorCode);
+        ok=checkFromUnicode(
+                cc, cnv, steps[i].name,
+                (uint8_t *)result, resultLength,
+                cc.offsets!=NULL ? resultOffsets : NULL,
+                errorCode);
+        if(U_FAILURE(errorCode) || !cc.finalFlush) {
+            // reset if an error occurred or we did not flush
+            // otherwise do nothing to make sure that flushing resets
+            ucnv_resetFromUnicode(cnv);
+        }
+        if (resultOffsets[resultLength] != -1) {
+            errln("fromUnicode[%d](%s) Conversion wrote too much to offsets at index %d",
+                cc.caseNr, cc.charset, resultLength);
+        }
+        if (result[resultLength] != (char)-1) {
+            errln("fromUnicode[%d](%s) Conversion wrote too much to result at index %d",
+                cc.caseNr, cc.charset, resultLength);
+        }
+
+        // bulk test is first, then offsets are not checked any more
+        cc.offsets=NULL;
+
+        // test direct conversion from UTF-8
+        if(cc.utf8Length>=0) {
+            errorCode=U_ZERO_ERROR;
+            resultLength=stepFromUTF8(cc, utf8Cnv, cnv,
+                                    result, UPRV_LENGTHOF(result),
+                                    step, &errorCode);
+            ok=checkFromUnicode(
+                    cc, cnv, steps[i].utf8Name,
+                    (uint8_t *)result, resultLength,
+                    NULL,
+                    errorCode);
+            if(U_FAILURE(errorCode) || !cc.finalFlush) {
+                // reset if an error occurred or we did not flush
+                // otherwise do nothing to make sure that flushing resets
+                ucnv_resetToUnicode(utf8Cnv);
+                ucnv_resetFromUnicode(cnv);
+            }
+        }
+    }
+
+    // not a real loop, just a convenience for breaking out of the block
+    while(ok && cc.finalFlush) {
+        // test ucnv_fromUChars()
+        memset(result, 0, sizeof(result));
+
+        errorCode=U_ZERO_ERROR;
+        resultLength=ucnv_fromUChars(cnv,
+                        result, UPRV_LENGTHOF(result),
+                        cc.unicode, cc.unicodeLength,
+                        &errorCode);
+        ok=checkFromUnicode(
+                cc, cnv, "fromUChars",
+                (uint8_t *)result, resultLength,
+                NULL,
+                errorCode);
+        if(!ok) {
+            break;
+        }
+
+        // test preflighting
+        // keep the correct result for simple checking
+        errorCode=U_ZERO_ERROR;
+        resultLength=ucnv_fromUChars(cnv,
+                        NULL, 0,
+                        cc.unicode, cc.unicodeLength,
+                        &errorCode);
+        if(errorCode==U_STRING_NOT_TERMINATED_WARNING || errorCode==U_BUFFER_OVERFLOW_ERROR) {
+            errorCode=U_ZERO_ERROR;
+        }
+        ok=checkFromUnicode(
+                cc, cnv, "preflight fromUChars",
+                (uint8_t *)result, resultLength,
+                NULL,
+                errorCode);
+        break;
+    }
+
+    ucnv_close(cnv);
+    return ok;
+}
+
+UBool
+ConversionTest::checkFromUnicode(ConversionCase &cc, UConverter *cnv, const char *name,
+                                 const uint8_t *result, int32_t resultLength,
+                                 const int32_t *resultOffsets,
+                                 UErrorCode resultErrorCode) {
+    UChar resultInvalidUChars[8];
+    int8_t resultInvalidLength;
+    UErrorCode errorCode;
+
+    const char *msg;
+
+    // reset the message; NULL will mean "ok"
+    msg=NULL;
+
+    errorCode=U_ZERO_ERROR;
+    resultInvalidLength=UPRV_LENGTHOF(resultInvalidUChars);
+    ucnv_getInvalidUChars(cnv, resultInvalidUChars, &resultInvalidLength, &errorCode);
+    if(U_FAILURE(errorCode)) {
+        errln("fromUnicode[%d](%s cb=\"%s\" fb=%d flush=%d %s) ucnv_getInvalidUChars() failed - %s",
+                cc.caseNr, cc.charset, cc.cbopt, cc.fallbacks, cc.finalFlush, name, u_errorName(errorCode));
+        return FALSE;
+    }
+
+    // check everything that might have gone wrong
+    if(cc.bytesLength!=resultLength) {
+        msg="wrong result length";
+    } else if(0!=memcmp(cc.bytes, result, cc.bytesLength)) {
+        msg="wrong result string";
+    } else if(cc.offsets!=NULL && 0!=memcmp(cc.offsets, resultOffsets, cc.bytesLength*sizeof(*cc.offsets))) {
+        msg="wrong offsets";
+    } else if(cc.outErrorCode!=resultErrorCode) {
+        msg="wrong error code";
+    } else if(cc.invalidLength!=resultInvalidLength) {
+        msg="wrong length of last invalid input";
+    } else if(0!=u_memcmp(cc.invalidUChars, resultInvalidUChars, cc.invalidLength)) {
+        msg="wrong last invalid input";
+    }
+
+    if(msg==NULL) {
+        return TRUE;
+    } else {
+        char buffer[2000]; // one buffer for all strings
+        char *s, *unicodeString, *bytesString, *resultString,
+            *offsetsString, *resultOffsetsString,
+            *invalidCharsString, *resultInvalidUCharsString;
+
+        unicodeString=s=buffer;
+        s=printUnicode(cc.unicode, cc.unicodeLength, unicodeString);
+        s=printBytes(cc.bytes, cc.bytesLength, bytesString=s);
+        s=printBytes(result, resultLength, resultString=s);
+        s=printOffsets(cc.offsets, cc.bytesLength, offsetsString=s);
+        s=printOffsets(resultOffsets, resultLength, resultOffsetsString=s);
+        s=printUnicode(cc.invalidUChars, cc.invalidLength, invalidCharsString=s);
+        s=printUnicode(resultInvalidUChars, resultInvalidLength, resultInvalidUCharsString=s);
+
+        if((s-buffer)>(int32_t)sizeof(buffer)) {
+            errln("fromUnicode[%d](%s cb=\"%s\" fb=%d flush=%d %s) fatal error: checkFromUnicode() test output buffer overflow writing %d chars\n",
+                    cc.caseNr, cc.charset, cc.cbopt, cc.fallbacks, cc.finalFlush, name, (int)(s-buffer));
+            exit(1);
+        }
+
+        errln("fromUnicode[%d](%s cb=\"%s\" fb=%d flush=%d %s) failed: %s\n"
+              "  unicode <%s>[%d]\n"
+              " expected <%s>[%d]\n"
+              "  result  <%s>[%d]\n"
+              " offsets         <%s>\n"
+              "  result offsets <%s>\n"
+              " error code expected %s got %s\n"
+              "  invalidChars expected <%s> got <%s>\n",
+              cc.caseNr, cc.charset, cc.cbopt, cc.fallbacks, cc.finalFlush, name, msg,
+              unicodeString, cc.unicodeLength,
+              bytesString, cc.bytesLength,
+              resultString, resultLength,
+              offsetsString,
+              resultOffsetsString,
+              u_errorName(cc.outErrorCode), u_errorName(resultErrorCode),
+              invalidCharsString, resultInvalidUCharsString);
+
+        return FALSE;
+    }
+}
+
+#endif /* #if !UCONFIG_NO_LEGACY_CONVERSION */