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/*
   uridec.c
   URI decoder Ver.0.1
   Copyright 1998 todome and HAT
   
   This program decode the URIs, but do not convert the character code.
   Thus, it shuld be used with the character code converter.
   (e.g., coco, gb2jis, jis2gb, hc, hmconv, jcode.pl, lv, nkf, qkc, etc.)
   
   See also RFC2396.
   
   usage: uridec [infile [outfile]]
   
   from infile to outfile
     % uridec infile outfile
   
   from infile to Shift_JIS textfile
     % uridec infile | nkf -s > outfile
   
   for Shift_JIS terminal
     % echo '%A4%B3%A4%F3%A4%CB%A4%C1%A4%CF' | uridec | nkf -s
   
   for EUC-JP terminal
     % echo '%82%B1%82%F1%82%CE%82%F1%82%CD' | uridec | nkf -e
   
*/

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

int hex2char(const int *hex);

int main(argc, argv)
     int argc;
     char **argv;
{
  FILE *fin = stdin, *fout = stdout;
  int  ch, hex[2], xpos = 0;
  
  if (argc == 2 || argc == 3) {
    if ((fin = fopen(*++argv, "rb")) == (FILE *)NULL) {
      fprintf(stderr, "%s: No such file or directory\n", *argv);
      exit(1);
    }
  }
  if (argc == 3) {
    if ((fout = fopen(*++argv, "wb")) == (FILE *)NULL) {
      fprintf(stderr, "%s: Permission denied\n", *argv);
      exit(1);
    }
  } else if (argc >= 4) {
    fprintf(stderr, "usage: uridec [infile [outfile]]\n");
    exit(1);
  }
  
  while((ch = fgetc(fin)) != EOF) {
    if(xpos == 1) {
      if(ch == '%') {
	fputc('%', fout);
	continue;
      }
      if(isalnum(ch)) {
	hex[0] = ch; xpos = 2;
      }
      else {
	fputc('%', fout); xpos = 0;
      }
    }
    else if(xpos == 2) {
      if(ch == '%') {
	fputc('%', fout); fputc(hex[0], fout); xpos = 1;
	continue;
      }
      if(isalnum(ch)) {
	hex[1] = ch; ch = hex2char(hex); xpos = 0;
      }
      else {
	fputc('%', fout); fputc(hex[0], fout); xpos = 0;
      }
    }
    else {
      if(ch == '%') xpos = 1;
    }
    if(xpos == 0) (ch == '+') ? fputc(' ', fout) : fputc(ch, fout);
  }
  return(0);
}

int hex2char(const int *hex)
{
  int ch0, ch1;
  
  ch0 = (isalpha(*hex)) ? toupper(*hex)-'A'+10 : *hex-'0';
  ch1 = (isalpha(*(hex+1))) ? toupper(*(hex+1))-'A'+10 : *(hex+1)-'0';
  
  return ch0*16 + ch1;
}

/* EOF */