uucode.c

mysql-5.0.22.tar.gz源码包

/* Copyright (C) 2003 MySQL AB

   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 <ndb_global.h>

/* ENC is the basic 1 character encoding function to make a char printing */
/* DEC is single character decode */
#define	ENC(c) ((c) ? ((c) & 077) + ' ': '`')
#define	DEC(c) (((c) - ' ') & 077)

/*
 * copy from in to out, encoding as you go along.
 */
void
uuencode(const char * data, int dataLen, FILE * out)
{
  int ch, n;
  const char *p = data;

  fprintf(out, "begin\n");
  
  while (dataLen > 0){
    n = dataLen > 45 ? 45 : dataLen;
    dataLen -= n;
    ch = ENC(n);
    if (putc(ch, out) == EOF)
      break;
    for (; n > 0; n -= 3, p += 3) {
      char p_0 = * p;
      char p_1 = 0;
      char p_2 = 0;

      if(n >= 2){
	p_1 = p[1];
      }
      if(n >= 3){
	p_2 = p[2];
      }
      
      ch = p_0 >> 2;
      ch = ENC(ch);
      if (putc(ch, out) == EOF)
	break;
      ch = ((p_0 << 4) & 060) | ((p_1 >> 4) & 017);
      ch = ENC(ch);
      if (putc(ch, out) == EOF)
	break;
      ch = ((p_1 << 2) & 074) | ((p_2 >> 6) & 03);
      ch = ENC(ch);
      if (putc(ch, out) == EOF)
	break;
      ch = p_2 & 077;
      ch = ENC(ch);
      if (putc(ch, out) == EOF)
	break;
    }
    if (putc('\n', out) == EOF)
      break;
  }
  ch = ENC('\0');
  putc(ch, out);
  putc('\n', out);
  fprintf(out, "end\n");
}

int
uudecode(FILE * input, char * outBuf, int bufLen){
  int n;
  char ch, *p, returnCode;
  char buf[255];

  returnCode = 0;
  /* search for header line */
  do {
    if (!fgets(buf, sizeof(buf), input)) {
      return 1;
    }
  } while (strncmp(buf, "begin", 5));
  
  /* for each input line */
  for (;;) {
    if (!fgets(p = buf, sizeof(buf), input)) {
      return 1;
    }
    /*
     * `n' is used to avoid writing out all the characters
     * at the end of the file.
     */
    if ((n = DEC(*p)) <= 0)
      break;
    if(n >= bufLen){
      returnCode = 1;
      break;
    }
    for (++p; n > 0; p += 4, n -= 3)
      if (n >= 3) {
	ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
	* outBuf = ch; outBuf++; bufLen--;
	ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
	* outBuf = ch; outBuf++; bufLen--;
	ch = DEC(p[2]) << 6 | DEC(p[3]);
	* outBuf = ch; outBuf++; bufLen--;
      } else {
	if (n >= 1) {
	  ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
	  * outBuf = ch; outBuf++; bufLen--;
	}
	if (n >= 2) {
	  ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
	  * outBuf = ch; outBuf++; bufLen--;
	}
	if (n >= 3) {
	  ch = DEC(p[2]) << 6 | DEC(p[3]);
	  * outBuf = ch; outBuf++; bufLen--;
	}
      }
  }
  if (!fgets(buf, sizeof(buf), input) || strcmp(buf, "end\n")) {
    return 1;
  }
  return returnCode;
}

int 
uuencode_mem(char * dst, const char * data, int dataLen)
{
  int sz = 0;

  int ch, n;
  const char *p = data;
  
  while (dataLen > 0){
    n = dataLen > 45 ? 45 : dataLen;
    dataLen -= n;
    ch = ENC(n);
    * dst = ch; dst++; sz++;
    for (; n > 0; n -= 3, p += 3) {
      char p_0 = * p;
      char p_1 = 0;
      char p_2 = 0;

      if(n >= 2){
	p_1 = p[1];
      }
      if(n >= 3){
	p_2 = p[2];
      }
      
      ch = p_0 >> 2;
      ch = ENC(ch);
      * dst = ch; dst++; sz++;

      ch = ((p_0 << 4) & 060) | ((p_1 >> 4) & 017);
      ch = ENC(ch);
      * dst = ch; dst++; sz++;

      ch = ((p_1 << 2) & 074) | ((p_2 >> 6) & 03);
      ch = ENC(ch);
      * dst = ch; dst++; sz++;

      ch = p_2 & 077;
      ch = ENC(ch);
      * dst = ch; dst++; sz++;
    }
    
    * dst = '\n'; dst++; sz++;
  }
  ch = ENC('\0');
  * dst = ch; dst++; sz++;
  
  * dst = '\n'; dst++; sz++;
  * dst = 0;    dst++; sz++;
  
  return sz;
}

int
uudecode_mem(char * outBuf, int bufLen, const char * src){
  int n;
  char ch;
  int sz = 0;
  const char * p = src;

  /*
   * `n' is used to avoid writing out all the characters
   * at the end of the file.
   */
  if ((n = DEC(*p)) <= 0)
    return 0;
  if(n >= bufLen){
    return -1;
  }
  for (++p; n > 0; p += 4, n -= 3){
    if (n >= 3) {
      ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
      * outBuf = ch; outBuf++; bufLen--; sz++;
      ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
      * outBuf = ch; outBuf++; bufLen--; sz++;
      ch = DEC(p[2]) << 6 | DEC(p[3]);
      * outBuf = ch; outBuf++; bufLen--; sz++;
    } else {
      if (n >= 1) {
	ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
	* outBuf = ch; outBuf++; bufLen--; sz++;
      }
      if (n >= 2) {
	ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
	* outBuf = ch; outBuf++; bufLen--; sz++;
      }
      if (n >= 3) {
	ch = DEC(p[2]) << 6 | DEC(p[3]);
	* outBuf = ch; outBuf++; bufLen--; sz++;
      }
    }
  }
  return sz;
}