Check in the pristine copy of ICU 4.6...

icu46/source/i18n/csrucode.cpp

Index: icu46/source/i18n/csrucode.cpp
===================================================================
--- icu46/source/i18n/csrucode.cpp	(revision 0)
+++ icu46/source/i18n/csrucode.cpp	(revision 0)
@@ -0,0 +1,146 @@
+/*
+ **********************************************************************
+ *   Copyright (C) 2005-2006, International Business Machines
+ *   Corporation and others.  All Rights Reserved.
+ **********************************************************************
+ */
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_CONVERSION
+
+#include "csrucode.h"
+
+U_NAMESPACE_BEGIN
+
+CharsetRecog_Unicode::~CharsetRecog_Unicode()
+{
+    // nothing to do
+}
+
+CharsetRecog_UTF_16_BE::~CharsetRecog_UTF_16_BE()
+{
+    // nothing to do
+}
+
+const char *CharsetRecog_UTF_16_BE::getName() const
+{
+    return "UTF-16BE";
+}
+
+int32_t CharsetRecog_UTF_16_BE::match(InputText* textIn)
+{
+    const uint8_t *input = textIn->fRawInput;
+
+    if (input[0] == 0xFE && input[1] == 0xFF) {
+        return 100;
+    }
+
+    // TODO: Do some statastics to check for unsigned UTF-16BE
+    return 0;
+}
+
+CharsetRecog_UTF_16_LE::~CharsetRecog_UTF_16_LE()
+{
+    // nothing to do
+}
+
+const char *CharsetRecog_UTF_16_LE::getName() const
+{
+    return "UTF-16LE";
+}
+
+int32_t CharsetRecog_UTF_16_LE::match(InputText* textIn)
+{
+    const uint8_t *input = textIn->fRawInput;
+
+    if (input[0] == 0xFF && input[1] == 0xFE && (input[2] != 0x00 || input[3] != 0x00)) {
+        return 100;
+    }
+
+    // TODO: Do some statastics to check for unsigned UTF-16LE
+    return 0;
+}
+
+CharsetRecog_UTF_32::~CharsetRecog_UTF_32()
+{
+    // nothing to do
+}
+
+int32_t CharsetRecog_UTF_32::match(InputText* textIn)
+{
+    const uint8_t *input = textIn->fRawInput;
+    int32_t limit = (textIn->fRawLength / 4) * 4;
+    int32_t numValid = 0;
+    int32_t numInvalid = 0;
+    bool hasBOM = FALSE;
+    int32_t confidence = 0;
+
+    if (getChar(input, 0) == 0x0000FEFFUL) {
+        hasBOM = TRUE;
+    }
+
+    for(int32_t i = 0; i < limit; i += 4) {
+        int32_t ch = getChar(input, i);
+
+        if (ch < 0 || ch >= 0x10FFFF || (ch >= 0xD800 && ch <= 0xDFFF)) {
+            numInvalid += 1;
+        } else {
+            numValid += 1;
+        }
+    }
+
+
+    // Cook up some sort of confidence score, based on presense of a BOM
+    //    and the existence of valid and/or invalid multi-byte sequences.
+    if (hasBOM && numInvalid==0) {
+        confidence = 100;
+    } else if (hasBOM && numValid > numInvalid*10) {
+        confidence = 80;
+    } else if (numValid > 3 && numInvalid == 0) {
+        confidence = 100;            
+    } else if (numValid > 0 && numInvalid == 0) {
+        confidence = 80;
+    } else if (numValid > numInvalid*10) {
+        // Probably corruput UTF-32BE data.  Valid sequences aren't likely by chance.
+        confidence = 25;
+    }
+
+    return confidence;
+}
+
+CharsetRecog_UTF_32_BE::~CharsetRecog_UTF_32_BE()
+{
+    // nothing to do
+}
+
+const char *CharsetRecog_UTF_32_BE::getName() const
+{
+    return "UTF-32BE";
+}
+
+int32_t CharsetRecog_UTF_32_BE::getChar(const uint8_t *input, int32_t index) const
+{
+    return input[index + 0] << 24 | input[index + 1] << 16 |
+           input[index + 2] <<  8 | input[index + 3];
+} 
+
+CharsetRecog_UTF_32_LE::~CharsetRecog_UTF_32_LE()
+{
+    // nothing to do
+}
+
+const char *CharsetRecog_UTF_32_LE::getName() const
+{
+    return "UTF-32LE";
+}
+
+int32_t CharsetRecog_UTF_32_LE::getChar(const uint8_t *input, int32_t index) const
+{
+    return input[index + 3] << 24 | input[index + 2] << 16 |
+           input[index + 1] <<  8 | input[index + 0];
+}
+
+U_NAMESPACE_END
+#endif
+
Property changes on: icu46/source/i18n/csrucode.cpp
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Added: svn:eol-style
   + LF