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/*
* Copyright (C) 2002-2010 XimpleWare, info@ximpleware.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "transcoder.h"
#include <stdio.h>
#include <stdlib.h>

static inline void my_fputc(int ch, FILE *f){
int i = fputc(ch, f);
if (i==EOF){
throwException2(io_exception,
"End of File reach in fputc");
}
}
int UTF16BE_Coder_encode(UByte* output,int offset,int ch){
if (ch<0x10000){
output[offset+1] = (ch & 0xff);
output[offset] = ((ch & 0xff00) >> 8);
return 2 + offset;
} else {
int tmp = ch-0x10000;
int w1 = 0xd800 | (tmp & 0xffc00);
int w2 = 0xdc00 | (tmp & 0x3ff);
output[offset] = ((w1 & 0xff00) >> 8);
output[offset+1] = (w1 & 0xff);
output[offset+2] = ((w2 & 0xff00) >> 8);
output[offset+3] = ((w2 & 0xff));
return 4 + offset;
}
}

Long UTF16BE_Coder_decode(UByte *input,int offset){
int val;
Long l;
int temp = (input[offset] << 8) | input[offset+1];
if (temp < 0xd800 || temp > 0xdfff) {
l = offset+2;
return (l<<32)|temp;
}else {
val = temp;
temp = (input[offset+2] << 8) | input[offset+3];
val = ((temp - 0xd800) << 10) + (val - 0xdc00) + 0x10000;
l = offset+4;
return (l<<32)|temp;
}
}

int UTF16BE_Coder_getLen(int ch){
  if (ch <0x10000)
            return 2;
        else
            return 4;
}

void UTF16BE_Coder_encodeAndWrite(FILE* f, int ch){
if (ch<0x10000){
//output[offset] = (byte)((ch & 0xff00) >> 8);
//os.write((ch & 0xff00) >> 8);
my_fputc((ch & 0xff00) >> 8,f);
//output[offset+1] = (byte)(ch & 0xff);
//os.write(ch);
my_fputc(ch,f);
//return 2 + offset;
} else {
int tmp = ch-0x10000;
int w1 = 0xd800 | (tmp & 0xffc00);
int w2 = 0xdc00 | (tmp & 0x3ff);
my_fputc(((w1 & 0xff00) >> 8),f);
my_fputc((w1 & 0xff),f);
my_fputc(((w2 & 0xff00) >> 8),f);
my_fputc((w2 & 0xff),f);
}
}

int UTF16LE_Coder_encode(UByte* output,int offset,int ch){
if (ch<0x10000){
output[offset] = (ch & 0xff);
output[offset+1] = ((ch & 0xff00) >> 8);
return 2 + offset;
} else {
int tmp = ch - 0x10000;
int w1 = 0xd800 | (tmp & 0xffc00);
int w2 = 0xdc00 | (tmp & 0x3ff);
output[offset] = (w1 & 0xff);
output[offset+1] = ((w1 & 0xff00) >> 8);
output[offset+2] =(w2 & 0xff);
output[offset+3] = ((w2 & 0xff00) >> 8);
return 4 + offset;
}
}
Long UTF16LE_Coder_decode(UByte *input,int offset){
int val; Long l;
int temp = (input[offset+1] << 8) | input[offset];
if (temp < 0xd800 || temp > 0xdfff) {
l = offset+2;
return (l<<32)|temp;
}else {
val = temp;
temp = (input[offset+3] << 8) | input[offset+2];
val = ((temp - 0xd800) << 10) + (val - 0xdc00) + 0x10000;
l = offset+4;
return (l<<32)|temp;
}
}

int UTF16LE_Coder_getLen(int ch){
if (ch <0x10000)
            return 2;
        else
            return 4;
}

void UTF16LE_Coder_encodeAndWrite(FILE* f, int ch){
if (ch<0x10000){
my_fputc((ch & 0xff),f);
my_fputc((ch & 0xff00) >> 8,f);
} else {
int tmp = ch - 0x10000;
int w1 = 0xd800 | (tmp & 0xffc00);
int w2 = 0xdc00 | (tmp & 0x3ff);
my_fputc(w1 & 0xff, f);
my_fputc((w1 & 0xff00) >> 8, f);
my_fputc(w2 & 0xff, f);
my_fputc((w2 & 0xff00) >> 8, f);
}
}

int UTF8_Coder_encode(UByte* output,int offset,int ch){
if (ch < 128){
output[offset] = ch;
return offset+1;
}
if (ch < 0x800){
output[offset]= (((ch & 0x7c0) >> 6) | 0xc0);
output[offset+1] = ((ch & 0x3f) | 0x80);
return offset+2;
}
if (ch < 0xe000){
output[offset]= (((ch & 0xf000) >> 12) | 0xe0);
output[offset+1] = (((ch & 0xfc) >> 6) | 0x80);
output[offset+2] = ((ch & 0x3f) | 0x80);
return offset+3;
}

output[offset]= (((ch & 0x1c0000) >> 18) | 0xf0);
output[offset+1] = (((ch & 0x3f0) >> 12) | 0x80);
output[offset+2] = (((ch & 0xfc) >> 6) | 0x80);
output[offset+3] = ((ch & 0x3f) | 0x80);

return offset+4;
}

Long UTF8_Coder_decode(UByte *input,int offset){
Long l = 0;
int c=0;
UByte val = input[offset];
if (val <128){
l = offset + 1;
return (l<<32) | val;
}

if ((val & 0xe0 )== 0xc0){
l = offset + 2;
c = (((int) (val& 0x1f))<< 6)| (input[offset+1] & 0x3f);
return (l<<32) | c;
}

if ((val & 0xf0) == 0xe0){
l = offset + 3;
c = (((int) (val& 0x0f))<<12) |
(((int)input[offset+1] & 0x3f)<<6) |
(input[offset+2] & 0x3f);
return (l<<32) | c;
}

l = offset+4;
c = (((int) (val& 0x07))<<18) |
(((int)input[offset+1] & 0x3f)<<12) |
(((int)input[offset+2] & 0x3f)<< 6) |
(input[offset+3] & 0x3f);

return (l<<32) | c;
}

int UTF8_Coder_getLen(int ch){
if (ch < 128)
return 1;
if (ch < 0x800)
return 2;
if (ch < 0xe000)
return 3;
if (ch < 0x10000)
return 4;
return 5;
}

void UTF8_Coder_encodeAndWrite(FILE* f, int ch){
if (ch < 128){
my_fputc(ch,f);
return;
}
if (ch < 0x800){
my_fputc(((ch & 0x7c0) >> 6) | 0xc0,f);
my_fputc((ch & 0x3f) | 0x80,f );
return;
}
if (ch < 0xe000){
my_fputc(((ch & 0xf000) >> 12) | 0xe0,f);
my_fputc(((ch & 0xfc) >> 6) | 0x80,f);
my_fputc((ch & 0x3f) | 0x80,f);
return;
}
my_fputc(((ch & 0x1c0000) >> 18) | 0xf0, f);
my_fputc(((ch & 0x3f0) >> 12) | 0x80, f);
my_fputc(((ch & 0xfc) >> 6) | 0x80, f);
my_fputc((ch & 0x3f) | 0x80, f);
}

int ASCII_Coder_encode(UByte* output,int offset,int ch){
output[offset] = ch;
    return offset+1;
}

Long ASCII_Coder_decode(UByte *input,int offset){
    Long l = input[offset];
    return (((Long)(offset+1))<<32) | l ;
}

int ASCII_Coder_getLen(int ch){
if (ch>127){
throwException2(transcode_exception,"Invalid UCS char for ASCII format");
return -1;
}
else
return 1;
}

void ASCII_Coder_encodeAndWrite(FILE* f, int ch){
if (ch>127)
throwException2(transcode_exception,"Invalid UCS char for ASCII format");
my_fputc(ch,f);
}

int ISO8859_1_Coder_encode(UByte* output,int offset,int ch){
output[offset] = ch;
return offset+1;
}
Long ISO8859_1_Coder_decode(UByte *input,int offset){
Long l = input[offset] & 0xff;
return (((Long)(offset+1))<<32) | l ;
}
int ISO8859_1_Coder_getLen(int ch){
if (ch>255)
{
throwException2(transcode_exception,"Invalid UCS char for ISO-8859-1 format");
return -1;
}
else
return 1;
}
void ISO8859_1_Coder_encodeAndWrite(FILE* f, int ch){
if (ch>255)
throwException2(transcode_exception,"Invalid UCS char for ISO-8859-1 format");
my_fputc(ch,f);
}

Long Transcoder_decode(UByte* input, int offset, encoding_t input_encoding){
 switch (input_encoding) {
        case FORMAT_ASCII:
            return ASCII_Coder_decode(input, offset);
        case FORMAT_UTF8:
            return UTF8_Coder_decode(input, offset);
        case FORMAT_ISO_8859_1:
            return ISO8859_1_Coder_decode(input, offset);
        case FORMAT_UTF_16LE:
            return UTF16LE_Coder_decode(input, offset);
        case FORMAT_UTF_16BE:
            return UTF16BE_Coder_decode(input, offset);
        default:
            throwException2(transcode_exception,"Unsupported encoding");
return -1;
        }
}

int Transcoder_encode(UByte* output, int offset, int ch, encoding_t output_encoding){
switch (output_encoding) {
case FORMAT_ASCII:
return ASCII_Coder_encode(output, offset, ch);
case FORMAT_UTF8:
return UTF8_Coder_encode(output, offset, ch);
case FORMAT_ISO_8859_1:
return ISO8859_1_Coder_encode(output, offset, ch);
case FORMAT_UTF_16LE:
return UTF16LE_Coder_encode(output, offset, ch);
case FORMAT_UTF_16BE:
return UTF16BE_Coder_encode(output, offset, ch);
default:
throwException2(transcode_exception, "Unsupported encoding");
return -1;
}
}

void Transcoder_encodeAndWrite(FILE* f, int ch, encoding_t output_encoding){
        switch (output_encoding) {
        case FORMAT_ASCII:
             ASCII_Coder_encodeAndWrite(f, ch);
         return;
        case FORMAT_UTF8:
             UTF8_Coder_encodeAndWrite(f, ch);
         return;
        case FORMAT_ISO_8859_1:
             ISO8859_1_Coder_encodeAndWrite(f, ch);
         return;
        case FORMAT_UTF_16LE:
             UTF16LE_Coder_encodeAndWrite(f, ch);
         return;
        case FORMAT_UTF_16BE:
             UTF16BE_Coder_encodeAndWrite(f, ch);
         return;
        default:
            throwException2(transcode_exception, "Unsupported encoding");
return;
        }
}

int Transcoder_getLen(int ch, encoding_t output_encoding){
switch (output_encoding) {
case FORMAT_ASCII:
return ASCII_Coder_getLen(ch);
case FORMAT_UTF8:
return UTF8_Coder_getLen(ch);
case FORMAT_ISO_8859_1:
return ISO8859_1_Coder_getLen(ch);
case FORMAT_UTF_16LE:
return UTF16LE_Coder_getLen(ch);
case FORMAT_UTF_16BE:
return UTF16BE_Coder_getLen(ch);
default:
throwException2(transcode_exception,"Unsupported encoding");
return -1;
}
}

int Transcoder_getOutLength(UByte* input, int offset,int length,encoding_t input_encoding, encoding_t output_encoding){
int len = 0;
int k = offset;
int c;
while (k < offset + length) {
Long l = Transcoder_decode(input, k, input_encoding);
k = (int) (l >>32);
c = (int) l;
len = len + Transcoder_getLen(c, output_encoding);
}
return len;
}

Long Transcoder_transcode(UByte* input, int offset, int length, encoding_t input_encoding, encoding_t output_encoding){
//check input and output encoding

// calculate the length of the output byte array
int i = Transcoder_getOutLength(input, offset, length, input_encoding,
output_encoding);
// allocate the byte array

UByte* output = (UByte*) malloc(i);
if (output==NULL){
throwException2(out_of_mem, "allocate byte buffer failed in Transcoder_transcode");
}
// fill the byte array with output encoding
Transcoder_transcodeAndFill(input, output, offset, length, input_encoding,
output_encoding);
return ((Long)i)<<32 | (int)output;
}

void Transcoder_transcodeAndFill(UByte* input, UByte* output,int offset, int length, encoding_t input_encoding, encoding_t output_encoding){
/*int len = 0;*/
int k = offset;
int c, i = 0;
while (k < offset + length) {
Long l = Transcoder_decode(input, k, input_encoding);
k = (int) (l >> 32);
c = (int) l;
i = Transcoder_encode(output, i, c, output_encoding);
}
}

int Transcoder_transcodeAndFill2(int initOutPosition, UByte* input, UByte* output, int offset, int length,
encoding_t input_encoding, encoding_t output_encoding){
/*int len = 0;*/
int k = offset;
int c, i = initOutPosition;
while (k < offset + length) {
Long l = Transcoder_decode(input, k, input_encoding);
k = (int) (l >> 32);
c = (int) l;
i = Transcoder_encode(output, i, c, output_encoding);
}
return i;
}

void Transcoder_transcodeAndWrite(UByte* input, FILE* f,int offset, int length, encoding_t input_encoding, encoding_t output_encoding){
/*int len = 0;*/
int k = offset;
int c;
while (k < offset + length) {
Long l = Transcoder_decode(input, k, input_encoding);
k = (int) (l >> 32);
c = (int) l;
Transcoder_encodeAndWrite(f, c, output_encoding);
}
}
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