output.c 5.95 KB
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/* output.c */

/* nettle, low-level cryptographics library
 *
 * Copyright (C) 2002, 2003 Niels Mller
 *  
 * The nettle library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 * 
 * The nettle library 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 Lesser General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with the nettle library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

#include "output.h"

#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void
sexp_output_init(struct sexp_output *output, FILE *f,
		 unsigned width, int prefer_hex)
{
  output->f = f;
  output->line_width = width;
  output->coding = NULL;
  output->prefer_hex = prefer_hex;
  output->hash = NULL;
  output->ctx = NULL;
  
  output->pos = 0;
}

void
sexp_output_hash_init(struct sexp_output *output,
		      const struct nettle_hash *hash, void *ctx)
{
  output->hash = hash;
  output->ctx = ctx;
  hash->init(ctx);
}

static void
sexp_put_raw_char(struct sexp_output *output, uint8_t c)
{
  output->pos++;
  if (putc(c, output->f) < 0)
    die("Write failed: %s\n", strerror(errno));
}

void 
sexp_put_newline(struct sexp_output *output,
		 unsigned indent)
{
  unsigned i;

  sexp_put_raw_char(output, '\n');
  output->pos = 0;
  
  for(i = 0; i < indent; i++)
    sexp_put_raw_char(output, ' ');
  
  output->pos = indent;
}

void
sexp_put_char(struct sexp_output *output, uint8_t c)
{
  if (output->coding)
    {
      /* Two is enough for both hex and base64. */
      uint8_t encoded[2];
      unsigned done;

      unsigned i;
      
      done = output->coding->encode_update(&output->state, encoded,
					   1, &c);
      assert(done <= sizeof(encoded));
      
      for (i = 0; i<done; i++)
	{
	  if (output->line_width
	      && output->pos >= output->line_width
	      && output->pos >= (output->coding_indent + 10))
	    sexp_put_newline(output, output->coding_indent);
	  
	  sexp_put_raw_char(output, encoded[i]);
	}
    }
  else if (output->hash)
    output->hash->update(output->ctx, 1, &c);
  else
    sexp_put_raw_char(output, c);
}

static void
sexp_put_data(struct sexp_output *output,
	      unsigned length, const uint8_t *data)
{
  unsigned i;

  for (i = 0; i<length; i++)
    sexp_put_char(output, data[i]);
}

static void
sexp_put_length(struct sexp_output *output, 
		unsigned length)
{
  unsigned digit = 1;

  for (;;)
    {
      unsigned next = digit * 10;
      if (next > length)
	break;
      digit = next;
    }

  for (; digit; length %= digit, digit /= 10)
    sexp_put_char(output, '0' + length / digit);
}

void
sexp_put_code_start(struct sexp_output *output,
		    const struct nettle_armor *coding)
{
  assert(!output->coding);
  
  output->coding_indent = output->pos;
  
  output->coding = coding;
  output->coding->encode_init(&output->state);
}

void
sexp_put_code_end(struct sexp_output *output)
{
  /* Enough for both hex and base64 */
  uint8_t encoded[BASE64_ENCODE_FINAL_LENGTH];
  unsigned done;

  assert(output->coding);

  done = output->coding->encode_final(&output->state, encoded);

  assert(done <= sizeof(encoded));
  
  output->coding = NULL;

  sexp_put_data(output, done, encoded);
}

void
sexp_put_string(struct sexp_output *output, enum sexp_mode mode,
		struct nettle_buffer *string)
{
  if (!string->size)
    sexp_put_data(output, 2,
		  (mode == SEXP_ADVANCED) ? "\"\"": "0:");

  else if (mode == SEXP_ADVANCED)
    {
      unsigned i;
      int token = (string->contents[0] < '0' || string->contents[0] > '9');
      int quote_friendly = 1;
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#define CONTROL_SIZE 0x20
      static const char escape_names[CONTROL_SIZE] =
	{
	  0,0,0,0,0,0,0,0, 'b','t','n',0,'f','r',0,0,
	  0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0
	};
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      for (i = 0; i<string->size; i++)
	{
	  uint8_t c = string->contents[i];
	  
	  if (token & !TOKEN_CHAR(c))
	    token = 0;
	  
	  if (quote_friendly)
	    {
	      if (c >= 0x7f)
		quote_friendly = 0;
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	      else if (c < CONTROL_SIZE && !escape_names[c])
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		quote_friendly = 0;
	    }
	}
      
      if (token)
	sexp_put_data(output, string->size, string->contents);

      else if (quote_friendly)
	{
	  sexp_put_char(output, '"');

	  for (i = 0; i<string->size; i++)
	    {
	      int escape = 0;
	      uint8_t c = string->contents[i];

	      assert(c < 0x7f);
	      
	      if (c == '\\' || c == '"')
		escape = 1;
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	      else if (c < CONTROL_SIZE)
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		{
		  escape = 1;
		  c = escape_names[c];
		  assert(c);
		}
	      if (escape)
		sexp_put_char(output, '\\');

	      sexp_put_char(output, c);
	    }
	  
	  sexp_put_char(output, '"');
	}
      else 
	{
	  uint8_t delimiter;
	  const struct nettle_armor *coding;
	  
	  if (output->prefer_hex)
	    {
	      delimiter = '#';
	      coding = &nettle_base16;
	    }
	  else
	    {
	      delimiter = '|';
	      coding = &nettle_base64;
	    }
	  
	  sexp_put_char(output, delimiter);
	  sexp_put_code_start(output, coding);
	  sexp_put_data(output, string->size, string->contents);
	  sexp_put_code_end(output);
	  sexp_put_char(output, delimiter);
	}
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#undef CONTROL_SIZE
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    }
  else
    {
      sexp_put_length(output, string->size);
      sexp_put_char(output, ':');
      sexp_put_data(output, string->size, string->contents);
    }
}

void
sexp_put_digest(struct sexp_output *output)
{
  uint8_t *digest;
  
  assert(output->hash);

  digest = alloca(output->hash->digest_size);
  output->hash->digest(output->ctx, output->hash->digest_size, digest);

  sexp_put_code_start(output, &nettle_base16);
  sexp_put_data(output, output->hash->digest_size, digest);
  sexp_put_code_end(output);
}