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Sourcecode: fhist version File versions

hexify.c

/*
 *    fhist - file history and comparison tools
 *    Copyright (C) 2000, 2002 Peter Miller;
 *    All rights reserved.
 *
 *    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, USA.
 *
 * MANIFEST: functions for reading input and converting to hexadecimal bytes
 */

#include <ac/ctype.h>
#include <ac/stdio.h> /* for sprintf */

#include <error.h>
#include <input/hexify.h>
#include <input/private.h>
#include <trace.h>


typedef struct input_hexify_ty input_hexify_ty;
struct input_hexify_ty
{
      input_ty    inherited;
      input_ty    *deeper;
      int         delete_on_close;
      int         buf_pos;
      char        buffer[16];
};


static void
destruct(input_ty *p)
{
      input_hexify_ty   *this;

      trace(("input_hexify::destruct()\n{\n"));
      this = (input_hexify_ty *)p;
      input_pushback_transfer(this->deeper, p);
      if (this->delete_on_close)
            input_delete(this->deeper);
      this->deeper = 0; /* paranoia */
      trace(("}\n"));
}


static int
get(input_ty *p)
{
      input_hexify_ty   *this;
      int         c;

      trace(("input_hexify::get()\n{\n"));
      this = (input_hexify_ty *)p;
      if (this->buffer[this->buf_pos] == 0)
      {
            char *ctrl = "";
            char *meta = "";
            int c2;
            c = input_getc(this->deeper);
            if (c < 0)
            {
                  trace(("return EOF;\n"));
                  return -1;
            }
            c2 = c;
            if (c2 & 0x80)
            {
                  meta = "M-";
                  c2 &= 0x7F;
            }
            if (!isprint(c2))
            {
                  ctrl = "^";
                  c2 ^= 0x40;
            }
            sprintf(this->buffer, "0x%02X  %s%s%c\n", c, meta, ctrl, c2);
            this->buf_pos = 0;
      }
      c = this->buffer[this->buf_pos++];
      trace(("return %d;\n", c));
      trace(("}\n"));
      return c;
}


static long
itell(input_ty *fp)
{
      input_hexify_ty   *this;

      this = (input_hexify_ty *)fp;
      trace(("input_hexify::tell => %ld\n", this->buf_pos));
      return input_ftell(this->deeper);
}


static const char *
name(input_ty *p)
{
      input_hexify_ty   *this;

      trace(("input_hexify::name\n"));
      this = (input_hexify_ty *)p;
      return input_name(this->deeper);
}


static long
length(input_ty *p)
{
      trace(("input_hexify::length => -1\n"));
      return -1;
}


static input_vtbl_ty vtbl =
{
      sizeof(input_hexify_ty),
      destruct,
      input_generic_read,
      get,
      itell,
      name,
      length,
};


input_ty *
input_hexify(input_ty *deeper, int delete_on_close)
{
      input_ty    *result;
      input_hexify_ty   *this;

      trace(("input_hexify(fp = %08lX)\n{\n", (long)deeper));
      result = input_new(&vtbl);
      this = (input_hexify_ty *)result;
      this->deeper = deeper;
      this->delete_on_close = delete_on_close;
      this->buf_pos = 0;
      this->buffer[0] = 0;
      trace(("return %08lX\n", (long)result));
      trace(("}\n"));
      return result;
}

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