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list-obj-sizes.awk

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  • Forked from Nettle / nettle
    Source project has a limited visibility.
    base16-decode.c 3.06 KiB
    /* base16-encode.c
    
       Hex decoding.
    
       Copyright (C) 2002 Niels Möller
    
       This file is part of GNU Nettle.
    
       GNU Nettle is free software: you can redistribute it and/or
       modify it under the terms of either:
    
         * the GNU Lesser General Public License as published by the Free
           Software Foundation; either version 3 of the License, or (at your
           option) any later version.
    
       or
    
         * 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.
    
       or both in parallel, as here.
    
       GNU Nettle 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 copies of the GNU General Public License and
       the GNU Lesser General Public License along with this program.  If
       not, see http://www.gnu.org/licenses/.
    */
     
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <assert.h>
    #include <stdlib.h>
    
    #include "base16.h"
    
    void
    base16_decode_init(struct base16_decode_ctx *ctx)
    {
      ctx->word = ctx->bits = 0;
    }
    
    enum { HEX_INVALID = -1, HEX_SPACE=-2 };
    
    static const signed char
    hex_decode_table[0x80] =
      {
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -1, -1, -2, -1, -1, 
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
         0,  1,  2,  3,  4,  5,  6,  7,  8,  9, -1, -1, -1, -1, -1, -1,
        -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
      };
    
    /* Decodes a single byte. Returns amount of output (0 or 1), or -1 on
     * errors. */
    int
    base16_decode_single(struct base16_decode_ctx *ctx,
    		     uint8_t *dst,
    		     char src)
    {
      /* Avoid signed char for indexing. */
      unsigned char usrc = src;
      int digit;
    
      if (usrc >= 0x80)
        return -1;
    
      digit = hex_decode_table[usrc];
      switch (digit)
        {
        case -1:
          return -1;
        case -2:
          return 0;
        default:
          assert(digit >= 0);
          assert(digit < 0x10);
    
          if (ctx->bits)
    	{
    	  *dst = (ctx->word << 4) | digit;
    	  ctx->bits = 0;
    	  return 1;
    	}
          else
    	{
    	  ctx->word = digit;
    	  ctx->bits = 4;
    	  return 0;
    	}
        }
    }
    
    int
    base16_decode_update(struct base16_decode_ctx *ctx,
    		     size_t *dst_length,
    		     uint8_t *dst,
    		     size_t src_length,
    		     const char *src)
    {
      size_t done;
      size_t i;
    
      for (i = done = 0; i<src_length; i++)
        switch(base16_decode_single(ctx, dst + done, src[i]))
          {
          case -1:
    	return 0;
          case 1:
    	done++;
    	/* Fall through */
          case 0:
    	break;
          default:
    	abort();
          }
      
      assert(done <= BASE16_DECODE_LENGTH(src_length));
    
      *dst_length = done;
      return 1;
    }
    
    int
    base16_decode_final(struct base16_decode_ctx *ctx)
    {
      return ctx->bits == 0;
    }