import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

intl/icu/source/common/unistr_case.cpp

@@ -0,0 +1,182 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+*
+*   Copyright (C) 1999-2014, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+*******************************************************************************
+*   file name:  unistr_case.cpp
+*   encoding:   US-ASCII
+*   tab size:   8 (not used)
+*   indentation:2
+*
+*   created on: 2004aug19
+*   created by: Markus W. Scherer
+*
+*   Case-mapping functions moved here from unistr.cpp
+*/
+
+#include "unicode/utypes.h"
+#include "unicode/putil.h"
+#include "cstring.h"
+#include "cmemory.h"
+#include "unicode/ustring.h"
+#include "unicode/unistr.h"
+#include "unicode/uchar.h"
+#include "uelement.h"
+#include "ustr_imp.h"
+
+U_NAMESPACE_BEGIN
+
+//========================================
+// Read-only implementation
+//========================================
+
+int8_t
+UnicodeString::doCaseCompare(int32_t start,
+                             int32_t length,
+                             const UChar *srcChars,
+                             int32_t srcStart,
+                             int32_t srcLength,
+                             uint32_t options) const
+{
+  // compare illegal string values
+  // treat const UChar *srcChars==NULL as an empty string
+  if(isBogus()) {
+    return -1;
+  }
+
+  // pin indices to legal values
+  pinIndices(start, length);
+
+  if(srcChars == NULL) {
+    srcStart = srcLength = 0;
+  }
+
+  // get the correct pointer
+  const UChar *chars = getArrayStart();
+
+  chars += start;
+  if(srcStart!=0) {
+    srcChars += srcStart;
+  }
+
+  if(chars != srcChars) {
+    UErrorCode errorCode=U_ZERO_ERROR;
+    int32_t result=u_strcmpFold(chars, length, srcChars, srcLength,
+                                options|U_COMPARE_IGNORE_CASE, &errorCode);
+    if(result!=0) {
+      return (int8_t)(result >> 24 | 1);
+    }
+  } else {
+    // get the srcLength if necessary
+    if(srcLength < 0) {
+      srcLength = u_strlen(srcChars + srcStart);
+    }
+    if(length != srcLength) {
+      return (int8_t)((length - srcLength) >> 24 | 1);
+    }
+  }
+  return 0;
+}
+
+//========================================
+// Write implementation
+//========================================
+
+UnicodeString &
+UnicodeString::caseMap(const UCaseMap *csm,
+                       UStringCaseMapper *stringCaseMapper) {
+  if(isEmpty() || !isWritable()) {
+    // nothing to do
+    return *this;
+  }
+
+  // We need to allocate a new buffer for the internal string case mapping function.
+  // This is very similar to how doReplace() keeps the old array pointer
+  // and deletes the old array itself after it is done.
+  // In addition, we are forcing cloneArrayIfNeeded() to always allocate a new array.
+  UChar oldStackBuffer[US_STACKBUF_SIZE];
+  UChar *oldArray;
+  int32_t oldLength;
+
+  if(fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) {
+    // copy the stack buffer contents because it will be overwritten
+    oldArray = oldStackBuffer;
+    oldLength = getShortLength();
+    u_memcpy(oldStackBuffer, fUnion.fStackFields.fBuffer, oldLength);
+  } else {
+    oldArray = getArrayStart();
+    oldLength = length();
+  }
+
+  int32_t capacity;
+  if(oldLength <= US_STACKBUF_SIZE) {
+    capacity = US_STACKBUF_SIZE;
+  } else {
+    capacity = oldLength + 20;
+  }
+  int32_t *bufferToDelete = 0;
+  if(!cloneArrayIfNeeded(capacity, capacity, FALSE, &bufferToDelete, TRUE)) {
+    return *this;
+  }
+
+  // Case-map, and if the result is too long, then reallocate and repeat.
+  UErrorCode errorCode;
+  int32_t newLength;
+  do {
+    errorCode = U_ZERO_ERROR;
+    newLength = stringCaseMapper(csm, getArrayStart(), getCapacity(),
+                                 oldArray, oldLength, &errorCode);
+    setLength(newLength);
+  } while(errorCode==U_BUFFER_OVERFLOW_ERROR && cloneArrayIfNeeded(newLength, newLength, FALSE));
+
+  if (bufferToDelete) {
+    uprv_free(bufferToDelete);
+  }
+  if(U_FAILURE(errorCode)) {
+    setToBogus();
+  }
+  return *this;
+}
+
+UnicodeString &
+UnicodeString::foldCase(uint32_t options) {
+  UCaseMap csm=UCASEMAP_INITIALIZER;
+  csm.csp=ucase_getSingleton();
+  csm.options=options;
+  return caseMap(&csm, ustrcase_internalFold);
+}
+
+U_NAMESPACE_END
+
+// Defined here to reduce dependencies on break iterator
+U_CAPI int32_t U_EXPORT2
+uhash_hashCaselessUnicodeString(const UElement key) {
+    U_NAMESPACE_USE
+    const UnicodeString *str = (const UnicodeString*) key.pointer;
+    if (str == NULL) {
+        return 0;
+    }
+    // Inefficient; a better way would be to have a hash function in
+    // UnicodeString that does case folding on the fly.
+    UnicodeString copy(*str);
+    return copy.foldCase().hashCode();
+}
+
+// Defined here to reduce dependencies on break iterator
+U_CAPI UBool U_EXPORT2
+uhash_compareCaselessUnicodeString(const UElement key1, const UElement key2) {
+    U_NAMESPACE_USE
+    const UnicodeString *str1 = (const UnicodeString*) key1.pointer;
+    const UnicodeString *str2 = (const UnicodeString*) key2.pointer;
+    if (str1 == str2) {
+        return TRUE;
+    }
+    if (str1 == NULL || str2 == NULL) {
+        return FALSE;
+    }
+    return str1->caseCompare(*str2, U_FOLD_CASE_DEFAULT) == 0;
+}