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