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/* output.c */
/* nettle, low-level cryptographics library
*
* Copyright (C) 2002, 2003 Niels Möller
*
* 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;
#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
};
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;
else if (c < CONTROL_SIZE && !escape_names[c])
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;
else if (c < CONTROL_SIZE)
{
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);
}
#undef CONTROL_SIZE
}
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);
}
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