/* infblock.c -- interpret and process block types to last block
 * Copyright (C) 1995-1998 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */

#include "zutil.h"
#include "infblock.h"
#include "inftrees.h"
#include "infcodes.h"
#include "infutil.h"

struct inflate_codes_state {int dummy;}; /* for buggy compilers */

/* simplify the use of the inflate_huft type with some defines */
#define exop word.what.Exop
#define bits word.what.Bits

/* Table for deflate from PKZIP's appnote.txt. */
local const uInt border[] = { /* Order of the bit length code lengths */
		16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};

/*
   Notes beyond the 1.93a appnote.txt:

   1. Distance pointers never point before the beginning of the output
	  stream.
   2. Distance pointers can point back across blocks, up to 32k away.
   3. There is an implied maximum of 7 bits for the bit length table and
	  15 bits for the actual data.
   4. If only one code exists, then it is encoded using one bit.  (Zero
	  would be more efficient, but perhaps a little confusing.)  If two
	  codes exist, they are coded using one bit each (0 and 1).
   5. There is no way of sending zero distance codes--a dummy must be
	  sent if there are none.  (History: a pre 2.0 version of PKZIP would
	  store blocks with no distance codes, but this was discovered to be
	  too harsh a criterion.)  Valid only for 1.93a.  2.04c does allow
	  zero distance codes, which is sent as one code of zero bits in
	  length.
   6. There are up to 286 literal/length codes.  Code 256 represents the
	  end-of-block.  Note however that the static length tree defines
	  288 codes just to fill out the Huffman codes.  Codes 286 and 287
	  cannot be used though, since there is no length base or extra bits
	  defined for them.  Similarily, there are up to 30 distance codes.
	  However, static trees define 32 codes (all 5 bits) to fill out the
	  Huffman codes, but the last two had better not show up in the data.
   7. Unzip can check dynamic Huffman blocks for complete code sets.
	  The exception is that a single code would not be complete (see #4).
   8. The five bits following the block type is really the number of
	  literal codes sent minus 257.
   9. Length codes 8,16,16 are interpreted as 13 length codes of 8 bits
	  (1+6+6).  Therefore, to output three times the length, you output
	  three codes (1+1+1), whereas to output four times the same length,
	  you only need two codes (1+3).  Hmm.
  10. In the tree reconstruction algorithm, Code = Code + Increment
	  only if BitLength(i) is not zero.  (Pretty obvious.)
  11. Correction: 4 Bits: # of Bit Length codes - 4	 (4 - 19)
  12. Note: length code 284 can represent 227-258, but length code 285
	  really is 258.  The last length deserves its own, short code
	  since it gets used a lot in very redundant files.  The length
	  258 is special since 258 - 3 (the min match length) is 255.
  13. The literal/length and distance code bit lengths are read as a
	  single stream of lengths.  It is possible (and advantageous) for
	  a repeat code (16, 17, or 18) to go across the boundary between
	  the two sets of lengths.
 */


void inflate_blocks_reset(inflate_blocks_statef *s,z_streamp z,uLongf *c)
{
  if (c != Z_NULL)
	*c = s->check;
  if (s->mode == BTREE || s->mode == DTREE)
	ZFREE(z, s->sub.trees.blens);
  if (s->mode == CODES)
	inflate_codes_free(s->sub.decode.codes, z);
  s->mode = TYPE;
  s->bitk = 0;
  s->bitb = 0;
  s->read = s->write = s->window;
  if (s->checkfn != Z_NULL)
	z->adler = s->check = (*s->checkfn)(0L, (const Bytef *)Z_NULL, 0);
  Tracev((stderr, "inflate:   blocks reset\n"));
}


inflate_blocks_statef *inflate_blocks_new(z_streamp z,check_func c,uInt w)
{
  inflate_blocks_statef *s;

  if ((s = (inflate_blocks_statef *)ZALLOC
	   (z,1,sizeof(struct inflate_blocks_state))) == Z_NULL)
	return s;
  if ((s->hufts =
	   (inflate_huft *)ZALLOC(z, sizeof(inflate_huft), MANY)) == Z_NULL)
  {
	ZFREE(z, s);
	return Z_NULL;
  }
  if ((s->window = (Bytef *)ZALLOC(z, 1, w)) == Z_NULL)
  {
	ZFREE(z, s->hufts);
	ZFREE(z, s);
	return Z_NULL;
  }
  s->end = s->window + w;
  s->checkfn = c;
  s->mode = TYPE;
  Tracev((stderr, "inflate:   blocks allocated\n"));
  inflate_blocks_reset(s, z, Z_NULL);
  return s;
}


int inflate_blocks(inflate_blocks_statef *s,z_streamp z,int r)
{
  uInt t;			   /* temporary storage */
  uLong b;			  /* bit buffer */
  uInt k;			   /* bits in bit buffer */
  Bytef *p;			 /* input data pointer */
  uInt n;			   /* bytes available there */
  Bytef *q;			 /* output window write pointer */
  uInt m;			   /* bytes to end of window or read pointer */

  /* copy input/output information to locals (UPDATE macro restores) */
  LOAD

  /* process input based on current state */
  while (1) switch (s->mode)
  {
	case TYPE:
	  NEEDBITS(3)
	  t = (uInt)b & 7;
	  s->last = t & 1;
	  switch (t >> 1)
	  {
		case 0:						 /* stored */
		  Tracev((stderr, "inflate:	 stored block%s\n",
				 s->last ? " (last)" : ""));
		  DUMPBITS(3)
		  t = k & 7;					/* go to byte boundary */
		  DUMPBITS(t)
		  s->mode = LENS;			   /* get length of stored block */
		  break;
		case 1:						 /* fixed */
		  Tracev((stderr, "inflate:	 fixed codes block%s\n",
				 s->last ? " (last)" : ""));
		  {
			uInt bl, bd;
			inflate_huft *tl, *td;

			inflate_trees_fixed(&bl, &bd, &tl, &td, z);
			s->sub.decode.codes = inflate_codes_new(bl, bd, tl, td, z);
			if (s->sub.decode.codes == Z_NULL)
			{
			  r = Z_MEM_ERROR;
			  LEAVE
			}
		  }
		  DUMPBITS(3)
		  s->mode = CODES;
		  break;
		case 2:						 /* dynamic */
		  Tracev((stderr, "inflate:	 dynamic codes block%s\n",
				 s->last ? " (last)" : ""));
		  DUMPBITS(3)
		  s->mode = TABLE;
		  break;
		case 3:						 /* illegal */
		  DUMPBITS(3)
		  s->mode = BAD;
		  z->msg = (char*)"invalid block type";
		  r = Z_DATA_ERROR;
		  LEAVE
	  }
	  break;
	case LENS:
	  NEEDBITS(32)
	  if ((((~b) >> 16) & 0xffff) != (b & 0xffff))
	  {
		s->mode = BAD;
		z->msg = (char*)"invalid stored block lengths";
		r = Z_DATA_ERROR;
		LEAVE
	  }
	  s->sub.left = (uInt)b & 0xffff;
	  b = k = 0;					  /* dump bits */
	  Tracev((stderr, "inflate:	   stored length %u\n", s->sub.left));
	  s->mode = s->sub.left ? STORED : (s->last ? DRY : TYPE);
	  break;
	case STORED:
	  if (n == 0)
		LEAVE
	  NEEDOUT
	  t = s->sub.left;
	  if (t > n) t = n;
	  if (t > m) t = m;
	  zmemcpy(q, p, t);
	  p += t;  n -= t;
	  q += t;  m -= t;
	  if ((s->sub.left -= t) != 0)
		break;
	  Tracev((stderr, "inflate:	   stored end, %lu total out\n",
			  z->total_out + (q >= s->read ? q - s->read :
			  (s->end - s->read) + (q - s->window))));
	  s->mode = s->last ? DRY : TYPE;
	  break;
	case TABLE:
	  NEEDBITS(14)
	  s->sub.trees.table = t = (uInt)b & 0x3fff;
#ifndef PKZIP_BUG_WORKAROUND
	  if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29)
	  {
		s->mode = BAD;
		z->msg = (char*)"too many length or distance symbols";
		r = Z_DATA_ERROR;
		LEAVE
	  }
#endif
	  t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f);
	  if ((s->sub.trees.blens = (uIntf*)ZALLOC(z, t, sizeof(uInt))) == Z_NULL)
	  {
		r = Z_MEM_ERROR;
		LEAVE
	  }
	  DUMPBITS(14)
	  s->sub.trees.index = 0;
	  Tracev((stderr, "inflate:	   table sizes ok\n"));
	  s->mode = BTREE;
	case BTREE:
	  while (s->sub.trees.index < 4 + (s->sub.trees.table >> 10))
	  {
		NEEDBITS(3)
		s->sub.trees.blens[border[s->sub.trees.index++]] = (uInt)b & 7;
		DUMPBITS(3)
	  }
	  while (s->sub.trees.index < 19)
		s->sub.trees.blens[border[s->sub.trees.index++]] = 0;
	  s->sub.trees.bb = 7;
	  t = inflate_trees_bits(s->sub.trees.blens, &s->sub.trees.bb,
							 &s->sub.trees.tb, s->hufts, z);
	  if (t != Z_OK)
	  {
		ZFREE(z, s->sub.trees.blens);
		r = t;
		if (r == Z_DATA_ERROR)
		  s->mode = BAD;
		LEAVE
	  }
	  s->sub.trees.index = 0;
	  Tracev((stderr, "inflate:	   bits tree ok\n"));
	  s->mode = DTREE;
	case DTREE:
	  while (t = s->sub.trees.table,
			 s->sub.trees.index < 258 + (t & 0x1f) + ((t >> 5) & 0x1f))
	  {
		inflate_huft *h;
		uInt i, j, c;

		t = s->sub.trees.bb;
		NEEDBITS(t)
		h = s->sub.trees.tb + ((uInt)b & inflate_mask[t]);
		t = h->bits;
		c = h->base;
		if (c < 16)
		{
		  DUMPBITS(t)
		  s->sub.trees.blens[s->sub.trees.index++] = c;
		}
		else /* c == 16..18 */
		{
		  i = c == 18 ? 7 : c - 14;
		  j = c == 18 ? 11 : 3;
		  NEEDBITS(t + i)
		  DUMPBITS(t)
		  j += (uInt)b & inflate_mask[i];
		  DUMPBITS(i)
		  i = s->sub.trees.index;
		  t = s->sub.trees.table;
		  if (i + j > 258 + (t & 0x1f) + ((t >> 5) & 0x1f) ||
			  (c == 16 && i < 1))
		  {
			ZFREE(z, s->sub.trees.blens);
			s->mode = BAD;
			z->msg = (char*)"invalid bit length repeat";
			r = Z_DATA_ERROR;
			LEAVE
		  }
		  c = c == 16 ? s->sub.trees.blens[i - 1] : 0;
		  do {
			s->sub.trees.blens[i++] = c;
		  } while (--j);
		  s->sub.trees.index = i;
		}
	  }
	  s->sub.trees.tb = Z_NULL;
	  {
		uInt bl, bd;
		inflate_huft *tl, *td;
		inflate_codes_statef *c;

		bl = 9;		 /* must be <= 9 for lookahead assumptions */
		bd = 6;		 /* must be <= 9 for lookahead assumptions */
		t = s->sub.trees.table;
		t = inflate_trees_dynamic(257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f),
								  s->sub.trees.blens, &bl, &bd, &tl, &td,
								  s->hufts, z);
		ZFREE(z, s->sub.trees.blens);
		if (t != Z_OK)
		{
		  if (t == (uInt)Z_DATA_ERROR)
			s->mode = BAD;
		  r = t;
		  LEAVE
		}
		Tracev((stderr, "inflate:	   trees ok\n"));
		if ((c = inflate_codes_new(bl, bd, tl, td, z)) == Z_NULL)
		{
		  r = Z_MEM_ERROR;
		  LEAVE
		}
		s->sub.decode.codes = c;
	  }
	  s->mode = CODES;
	case CODES:
	  UPDATE
	  if ((r = inflate_codes(s, z, r)) != Z_STREAM_END)
		return inflate_flush(s, z, r);
	  r = Z_OK;
	  inflate_codes_free(s->sub.decode.codes, z);
	  LOAD
	  Tracev((stderr, "inflate:	   codes end, %lu total out\n",
			  z->total_out + (q >= s->read ? q - s->read :
			  (s->end - s->read) + (q - s->window))));
	  if (!s->last)
	  {
		s->mode = TYPE;
		break;
	  }
	  s->mode = DRY;
	case DRY:
	  FLUSH
	  if (s->read != s->write)
		LEAVE
	  s->mode = DONE;
	case DONE:
	  r = Z_STREAM_END;
	  LEAVE
	case BAD:
	  r = Z_DATA_ERROR;
	  LEAVE
	default:
	  r = Z_STREAM_ERROR;
	  LEAVE
  }
}


int inflate_blocks_free(inflate_blocks_statef *s,z_streamp z)
{
  inflate_blocks_reset(s, z, Z_NULL);
  ZFREE(z, s->window);
  ZFREE(z, s->hufts);
  ZFREE(z, s);
  Tracev((stderr, "inflate:   blocks freed\n"));
  return Z_OK;
}


void inflate_set_dictionary(inflate_blocks_statef *s,const Bytef *d,uInt n)
{
  zmemcpy(s->window, d, n);
  s->read = s->write = s->window + n;
}


/* Returns true if inflate is currently at the end of a block generated
 * by Z_SYNC_FLUSH or Z_FULL_FLUSH. 
 * IN assertion: s != Z_NULL
 */
int inflate_blocks_sync_point(inflate_blocks_statef *s)
{
  return s->mode == LENS;
}
