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/*
CUuenc.cpp
Classe base per codifica/decodifica in formato UUENC (CRT).
Luca Piergentili, 21/11/96
lpiergentili@yahoo.com
http://www.geocities.com/lpiergentili/
*/
#include "env.h"
#include "pragma.h"
#pragma warning (disable:4135) // conversione tipi
#pragma warning (disable:4244) // conversione tipi
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "CUuenc.h"
/*
uuENC()
*/
static unsigned char uuENC(unsigned char outbyte)
{
static const char UUEncodeTable[] = {
"`!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_"
};
return(UUEncodeTable[(outbyte & 0x3f)]);
}
/*
uuDEC()
*/
static unsigned char uuDEC(unsigned char inbyte)
{
return((inbyte - ' ') & 0x3f);
}
/*
Encode()
*/
int CUuenc::Encode(const char *InputFileName,const char *OutputFileName)
{
int NumRead;
int CurPos;
unsigned char CurByte;
unsigned char CurLine[64];
unsigned char EncodedLine[512];
unsigned char* PtrEncodedLine = EncodedLine;
FILE* DecodedFile;
FILE* EncodedFile;
if((DecodedFile = fopen(InputFileName,"rb"))==(FILE*)NULL)
return(-1);
if((EncodedFile = fopen(OutputFileName,"wb"))==(FILE*)NULL)
{
fclose(DecodedFile);
return(-1);
}
while(!feof(DecodedFile))
{
memset(CurLine,'\0',sizeof(CurLine));
memset(EncodedLine,'\0',sizeof(EncodedLine));
PtrEncodedLine = EncodedLine;
NumRead = 0;
while(NumRead < 45 && !feof(DecodedFile))
{
CurByte = fgetc(DecodedFile);
NumRead++;
CurLine[NumRead] = CurByte;
}
*PtrEncodedLine++ = uuENC((char)NumRead);
CurPos = 1;
while(CurPos <= (NumRead-2))
{
CurByte = (CurLine[CurPos] >> 2);
*PtrEncodedLine++ = uuENC(CurByte);
CurByte = (CurLine[CurPos] << 4) | (CurLine[CurPos+1] >> 4);
*PtrEncodedLine++ = uuENC(CurByte);
CurByte = (CurLine[CurPos+1] << 2) | (CurLine[CurPos+2] >> 6);
*PtrEncodedLine++ = uuENC(CurByte);
CurByte = (CurLine[CurPos+2] & 0x3f);
*PtrEncodedLine++ = uuENC(CurByte);
CurPos += 3;
}
if(CurPos < NumRead)
{
CurByte = (CurLine[CurPos] >> 2);
*PtrEncodedLine++ = uuENC(CurByte);
if(CurPos==(NumRead-1))
{
CurByte = ((CurLine[CurPos] << 4) & 0x30);
*PtrEncodedLine++ = uuENC(CurByte);
}
else
{
CurByte = (((CurLine[CurPos] << 4) & 0x30) | ((CurLine[CurPos+1] >> 4) & 0x0f));
*PtrEncodedLine++ = uuENC(CurByte);
CurByte = ((CurLine[CurPos+1] << 2) & 0x3c);
}
*PtrEncodedLine++ = uuENC(CurByte);
}
fprintf(EncodedFile,"%s\r\n",EncodedLine);
}
fclose(EncodedFile);
fclose(DecodedFile);
return(0);
}
/*
Decode()
*/
int CUuenc::Decode(const char *InputFileName,const char *OutputFileName)
{
int NumChars;
int CurPos;
char CurLine[64];
char CurChar;
FILE* EncodedFile;
FILE* DecodedFile;
if((EncodedFile = fopen(InputFileName,"rt"))==(FILE*)NULL)
return(-1);
if((DecodedFile = fopen(OutputFileName,"wb"))==(FILE*)NULL)
{
fclose(EncodedFile);
return(-1);
}
while(!feof(EncodedFile))
{
if(fgets(CurLine,sizeof(CurLine)-1,EncodedFile))
{
NumChars = (int)uuDEC(CurLine[0]);
if(NumChars < 45)
NumChars--;
if(NumChars > 0)
{
CurPos = 1;
while(NumChars > 0)
{
if(NumChars >= 3)
{
CurChar = ((uuDEC(CurLine[CurPos]) << 2) | (uuDEC(CurLine[CurPos+1]) >> 4));
fputc(CurChar,DecodedFile);
CurChar = ((uuDEC(CurLine[CurPos+1]) << 4) | (uuDEC(CurLine[CurPos+2]) >> 2));
fputc(CurChar,DecodedFile);
CurChar = ((uuDEC(CurLine[CurPos+2]) << 6) | (uuDEC(CurLine[CurPos+3])));
fputc(CurChar,DecodedFile);
}
else
{
if(NumChars >= 1)
{
CurChar = ((uuDEC(CurLine[CurPos]) << 2) | (uuDEC(CurLine[CurPos+1]) >> 4));
fputc(CurChar,DecodedFile);
}
if(NumChars >= 2)
{
CurChar = ((uuDEC(CurLine[CurPos+1]) << 4) | (uuDEC(CurLine[CurPos+2]) >> 2));
fputc(CurChar,DecodedFile);
}
}
NumChars -= 3;
CurPos += 4;
}
}
}
}
fclose(EncodedFile);
fclose(DecodedFile);
return(0);
}
#pragma warning (default:4135) // conversione tipi
#pragma warning (default:4244) // conversione tipi
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