1 files changed, 156 insertions, 0 deletions
diff --git a/runtime/utf.cc b/runtime/utf.cc
new file mode 100644
index 0000000000..1add7d9a68
--- /dev/null
+++ b/runtime/utf.cc
@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 2011 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 "utf.h"
+
+#include "base/logging.h"
+#include "mirror/array.h"
+#include "mirror/object-inl.h"
+
+namespace art {
+
+size_t CountModifiedUtf8Chars(const char* utf8) {
+  size_t len = 0;
+  int ic;
+  while ((ic = *utf8++) != '\0') {
+    len++;
+    if ((ic & 0x80) == 0) {
+      // one-byte encoding
+      continue;
+    }
+    // two- or three-byte encoding
+    utf8++;
+    if ((ic & 0x20) == 0) {
+      // two-byte encoding
+      continue;
+    }
+    // three-byte encoding
+    utf8++;
+  }
+  return len;
+}
+
+void ConvertModifiedUtf8ToUtf16(uint16_t* utf16_data_out, const char* utf8_data_in) {
+  while (*utf8_data_in != '\0') {
+    *utf16_data_out++ = GetUtf16FromUtf8(&utf8_data_in);
+  }
+}
+
+void ConvertUtf16ToModifiedUtf8(char* utf8_out, const uint16_t* utf16_in, size_t char_count) {
+  while (char_count--) {
+    uint16_t ch = *utf16_in++;
+    if (ch > 0 && ch <= 0x7f) {
+      *utf8_out++ = ch;
+    } else {
+      if (ch > 0x07ff) {
+        *utf8_out++ = (ch >> 12) | 0xe0;
+        *utf8_out++ = ((ch >> 6) & 0x3f) | 0x80;
+        *utf8_out++ = (ch & 0x3f) | 0x80;
+      } else /*(ch > 0x7f || ch == 0)*/ {
+        *utf8_out++ = (ch >> 6) | 0xc0;
+        *utf8_out++ = (ch & 0x3f) | 0x80;
+      }
+    }
+  }
+}
+
+int32_t ComputeUtf16Hash(const mirror::CharArray* chars, int32_t offset,
+                         size_t char_count) {
+  int32_t hash = 0;
+  for (size_t i = 0; i < char_count; i++) {
+    hash = hash * 31 + chars->Get(offset + i);
+  }
+  return hash;
+}
+
+int32_t ComputeUtf16Hash(const uint16_t* chars, size_t char_count) {
+  int32_t hash = 0;
+  while (char_count--) {
+    hash = hash * 31 + *chars++;
+  }
+  return hash;
+}
+
+
+uint16_t GetUtf16FromUtf8(const char** utf8_data_in) {
+  uint8_t one = *(*utf8_data_in)++;
+  if ((one & 0x80) == 0) {
+    // one-byte encoding
+    return one;
+  }
+  // two- or three-byte encoding
+  uint8_t two = *(*utf8_data_in)++;
+  if ((one & 0x20) == 0) {
+    // two-byte encoding
+    return ((one & 0x1f) << 6) | (two & 0x3f);
+  }
+  // three-byte encoding
+  uint8_t three = *(*utf8_data_in)++;
+  return ((one & 0x0f) << 12) | ((two & 0x3f) << 6) | (three & 0x3f);
+}
+
+int CompareModifiedUtf8ToModifiedUtf8AsUtf16CodePointValues(const char* utf8_1, const char* utf8_2) {
+  for (;;) {
+    if (*utf8_1 == '\0') {
+      return (*utf8_2 == '\0') ? 0 : -1;
+    } else if (*utf8_2 == '\0') {
+      return 1;
+    }
+
+    int c1 = GetUtf16FromUtf8(&utf8_1);
+    int c2 = GetUtf16FromUtf8(&utf8_2);
+
+    if (c1 != c2) {
+      return c1 > c2 ? 1 : -1;
+    }
+  }
+}
+
+int CompareModifiedUtf8ToUtf16AsCodePointValues(const char* utf8_1, const uint16_t* utf8_2) {
+  for (;;) {
+    if (*utf8_1 == '\0') {
+      return (*utf8_2 == '\0') ? 0 : -1;
+    } else if (*utf8_2 == '\0') {
+      return 1;
+    }
+
+    int c1 = GetUtf16FromUtf8(&utf8_1);
+    int c2 = *utf8_2;
+
+    if (c1 != c2) {
+      return c1 > c2 ? 1 : -1;
+    }
+  }
+}
+
+size_t CountUtf8Bytes(const uint16_t* chars, size_t char_count) {
+  size_t result = 0;
+  while (char_count--) {
+    uint16_t ch = *chars++;
+    if (ch > 0 && ch <= 0x7f) {
+      ++result;
+    } else {
+      if (ch > 0x7ff) {
+        result += 3;
+      } else {
+        result += 2;
+      }
+    }
+  }
+  return result;
+}
+
+}  // namespace art