1 files changed, 193 insertions, 0 deletions
diff --git a/libs/utils/Unicode.cpp b/libs/utils/Unicode.cpp
new file mode 100644
index 0000000..33f535f
--- /dev/null
+++ b/libs/utils/Unicode.cpp
@@ -0,0 +1,193 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "utils/AndroidUnicode.h"
+#include "characterData.h"
+
+#define LOG_TAG "Unicode"
+#include "utils/Log.h"
+
+// ICU headers for using macros
+#include <unicode/utf16.h>
+
+#define MIN_RADIX 2
+#define MAX_RADIX 36
+
+#define TYPE_SHIFT 0
+#define TYPE_MASK ((1<<5)-1)
+
+#define DIRECTION_SHIFT (TYPE_SHIFT+5)
+#define DIRECTION_MASK ((1<<5)-1)
+
+#define MIRRORED_SHIFT (DIRECTION_SHIFT+5)
+#define MIRRORED_MASK ((1<<1)-1)
+
+#define TOUPPER_SHIFT (MIRRORED_SHIFT+1)
+#define TOUPPER_MASK ((1<<6)-1)
+
+#define TOLOWER_SHIFT (TOUPPER_SHIFT+6)
+#define TOLOWER_MASK ((1<<6)-1)
+
+#define TOTITLE_SHIFT (TOLOWER_SHIFT+6)
+#define TOTITLE_MASK ((1<<2)-1)
+
+#define MIRROR_SHIFT (TOTITLE_SHIFT+2)
+#define MIRROR_MASK ((1<<5)-1)
+
+#define NUMERIC_SHIFT (TOTITLE_SHIFT+2)
+#define NUMERIC_MASK ((1<<7)-1)
+
+#define DECOMPOSITION_SHIFT (11)
+#define DECOMPOSITION_MASK ((1<<5)-1)
+
+/*
+ * Returns the value stored in the CharacterData tables that contains
+ * an index into the packed data table and the decomposition type.
+ */
+static uint16_t findCharacterValue(UChar32 c)
+{
+    LOG_ASSERT(c >= 0 && c <= 0x10FFFF, "findCharacterValue received an invalid codepoint");
+    if (c < 256)
+        return CharacterData::LATIN1_DATA[c];
+
+    // Rotate the bits because the tables are separated into even and odd codepoints
+    c = (c >> 1) | ((c & 1) << 20);
+
+    CharacterData::Range search = CharacterData::FULL_DATA[c >> 16];
+    const uint32_t* array = search.array;
+ 
+    // This trick is so that that compare in the while loop does not
+    // need to shift the array entry down by 16
+    c <<= 16;
+    c |= 0xFFFF;
+
+    int high = (int)search.length - 1;
+    int low = 0;
+
+    if (high < 0)
+        return 0;
+    
+    while (low < high - 1)
+    {
+        int probe = (high + low) >> 1;
+
+        // The entries contain the codepoint in the high 16 bits and the index
+        // into PACKED_DATA in the low 16.
+        if (array[probe] > (unsigned)c)
+            high = probe;
+        else
+            low = probe;
+    }
+
+    LOG_ASSERT((array[low] <= (unsigned)c), "A suitable range was not found");
+    return array[low] & 0xFFFF;
+}
+
+uint32_t android::Unicode::getPackedData(UChar32 c)
+{
+    // findCharacterValue returns a 16-bit value with the top 5 bits containing a decomposition type
+    // and the remaining bits containing an index.
+    return CharacterData::PACKED_DATA[findCharacterValue(c) & 0x7FF];
+}
+
+android::Unicode::CharType android::Unicode::getType(UChar32 c)
+{
+    if (c < 0 || c >= 0x10FFFF)
+        return CHARTYPE_UNASSIGNED;
+    return (CharType)((getPackedData(c) >> TYPE_SHIFT) & TYPE_MASK);
+}
+
+android::Unicode::DecompositionType android::Unicode::getDecompositionType(UChar32 c)
+{
+    // findCharacterValue returns a 16-bit value with the top 5 bits containing a decomposition type
+    // and the remaining bits containing an index.
+    return (DecompositionType)((findCharacterValue(c) >> DECOMPOSITION_SHIFT) & DECOMPOSITION_MASK);
+}
+
+int android::Unicode::getDigitValue(UChar32 c, int radix)
+{
+    if (radix < MIN_RADIX || radix > MAX_RADIX)
+        return -1;
+
+    int tempValue = radix;
+    
+    if (c >= '0' && c <= '9')
+        tempValue = c - '0';
+    else if (c >= 'a' && c <= 'z')
+        tempValue = c - 'a' + 10;
+    else if (c >= 'A' && c <= 'Z')
+        tempValue = c - 'A' + 10;
+    
+    return tempValue < radix ? tempValue : -1;
+}
+
+int android::Unicode::getNumericValue(UChar32 c)
+{
+    if (isMirrored(c))
+        return -1;
+    
+    return (int) CharacterData::NUMERICS[((getPackedData(c) >> NUMERIC_SHIFT) & NUMERIC_MASK)];
+}
+
+UChar32 android::Unicode::toLower(UChar32 c)
+{
+    return c + CharacterData::LCDIFF[(getPackedData(c) >> TOLOWER_SHIFT) & TOLOWER_MASK];
+}
+
+UChar32 android::Unicode::toUpper(UChar32 c)
+{
+    return c + CharacterData::UCDIFF[(getPackedData(c) >> TOUPPER_SHIFT) & TOUPPER_MASK];
+}
+
+android::Unicode::Direction android::Unicode::getDirectionality(UChar32 c)
+{
+    uint32_t data = getPackedData(c);
+
+    if (0 == data)
+        return DIRECTIONALITY_UNDEFINED;
+
+    Direction d = (Direction) ((data >> DIRECTION_SHIFT) & DIRECTION_MASK);
+
+    if (DIRECTION_MASK == d)
+        return DIRECTIONALITY_UNDEFINED;
+    
+    return d;
+}
+
+bool android::Unicode::isMirrored(UChar32 c)
+{
+    return ((getPackedData(c) >> MIRRORED_SHIFT) & MIRRORED_MASK) != 0;
+}
+
+UChar32 android::Unicode::toMirror(UChar32 c)
+{
+    if (!isMirrored(c))
+        return c;
+
+    return c + CharacterData::MIRROR_DIFF[(getPackedData(c) >> MIRROR_SHIFT) & MIRROR_MASK];
+}
+
+UChar32 android::Unicode::toTitle(UChar32 c)
+{
+    int32_t diff = CharacterData::TCDIFF[(getPackedData(c) >> TOTITLE_SHIFT) & TOTITLE_MASK];
+
+    if (TOTITLE_MASK == diff)
+        return toUpper(c);
+    
+    return c + diff;
+}
+
+