Viewing file:  UnicodeReader.cpp (4.1 KB) -rw-r--r--
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/*
******************************************************************************
* © 2016 and later: Unicode, Inc. and others. *
* License & terms of use: http://www.unicode.org/copyright.html#License *
******************************************************************************
******************************************************************************
* Copyright (C) 1998-2005, International Business Machines Corporation and *
* others. All Rights Reserved. *
******************************************************************************
*/
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "unicode/utypes.h"
#include "unicode/unistr.h"
#include "layout/LETypes.h"
#include "GUISupport.h"
#include "UnicodeReader.h"
#define BYTE(b) (((int) b) & 0xFF)
/*
* Read the text from a file. The text must start with a Unicode Byte
* Order Mark (BOM) so that we know what order to read the bytes in.
*/
const UChar *UnicodeReader::readFile(const char *fileName, GUISupport *guiSupport, int32_t &charCount)
{
FILE *f;
int32_t fileSize;
UChar *charBuffer;
char *byteBuffer;
char startBytes[4] = {'\xA5', '\xA5', '\xA5', '\xA5'};
char errorMessage[128];
const char *cp = "";
int32_t signatureLength = 0;
f = fopen(fileName, "rb");
if( f == NULL ) {
sprintf(errorMessage,"Couldn't open %s: %s \n", fileName, strerror(errno));
guiSupport->postErrorMessage(errorMessage, "Text File Error");
return 0;
}
fseek(f, 0, SEEK_END);
fileSize = ftell(f);
fseek(f, 0, SEEK_SET);
fread(startBytes, sizeof(char), 4, f);
if (startBytes[0] == '\xFE' && startBytes[1] == '\xFF') {
cp = "UTF-16BE";
signatureLength = 2;
} else if (startBytes[0] == '\xFF' && startBytes[1] == '\xFE') {
if (startBytes[2] == '\x00' && startBytes[3] == '\x00') {
cp = "UTF-32LE";
signatureLength = 4;
} else {
cp = "UTF-16LE";
signatureLength = 2;
}
} else if (startBytes[0] == '\xEF' && startBytes[1] == '\xBB' && startBytes[2] == '\xBF') {
cp = "UTF-8";
signatureLength = 3;
} else if (startBytes[0] == '\x0E' && startBytes[1] == '\xFE' && startBytes[2] == '\xFF') {
cp = "SCSU";
signatureLength = 3;
} else if (startBytes[0] == '\x00' && startBytes[1] == '\x00' &&
startBytes[2] == '\xFE' && startBytes[3] == '\xFF') {
cp = "UTF-32BE";
signatureLength = 4;
} else {
sprintf(errorMessage, "Couldn't detect the encoding of %s: (%2.2X, %2.2X, %2.2X, %2.2X)\n", fileName,
BYTE(startBytes[0]), BYTE(startBytes[1]), BYTE(startBytes[2]), BYTE(startBytes[3]));
guiSupport->postErrorMessage(errorMessage, "Text File Error");
fclose(f);
return 0;
}
fileSize -= signatureLength;
fseek(f, signatureLength, SEEK_SET);
byteBuffer = new char[fileSize];
if(byteBuffer == 0) {
sprintf(errorMessage,"Couldn't get memory for reading %s: %s \n", fileName, strerror(errno));
guiSupport->postErrorMessage(errorMessage, "Text File Error");
fclose(f);
return 0;
}
fread(byteBuffer, sizeof(char), fileSize, f);
if( ferror(f) ) {
sprintf(errorMessage,"Couldn't read %s: %s \n", fileName, strerror(errno));
guiSupport->postErrorMessage(errorMessage, "Text File Error");
fclose(f);
delete[] byteBuffer;
return 0;
}
fclose(f);
UnicodeString myText(byteBuffer, fileSize, cp);
delete[] byteBuffer;
charCount = myText.length();
charBuffer = LE_NEW_ARRAY(UChar, charCount + 1);
if(charBuffer == 0) {
sprintf(errorMessage,"Couldn't get memory for reading %s: %s \n", fileName, strerror(errno));
guiSupport->postErrorMessage(errorMessage, "Text File Error");
return 0;
}
myText.extract(0, myText.length(), charBuffer);
charBuffer[charCount] = 0; // NULL terminate for easier reading in the debugger
return charBuffer;
}
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