/* -*- C++ -*-
 *  Authors:
 *    Ralf Scheidhauer <Ralf.Scheidhauer@ps.uni-sb.de>
 *    Konstantin Popov <kost@sics.se>
 * 
 *  Contributors:
 *    Per Brand <perbrand@sics.se>
 *    Michael Mehl <mehl@dfki.de>
 *    Denys Duchier <duchier@ps.uni-sb.de>
 *    Andreas Sundstroem <andreas@sics.se>
 * 
 *  Copyright:
 *    Organization or Person (Year(s))
 * 
 *  Last change:
 *    $Date: 2006-08-24 17:03:44 +0200 (Thu, 24 Aug 2006) $ by $Author: mejias $
 *    $Revision: 16449 $
 * 
 *  This file is part of Mozart, an implementation 
 *  of Oz 3:
 *     http://mozart.ps.uni-sb.de
 * 
 *  See the file "LICENSE" or
 *     http://mozart.ps.uni-sb.de/LICENSE.html
 *  for information on usage and redistribution 
 *  of this file, and for a DISCLAIMER OF ALL 
 *  WARRANTIES.
 *
 */

#ifdef INTERFACE
#pragma implementation "pickleBase.hh"
#endif

#include "base.hh"
#include "pickleBase.hh"

//
// kost@ : The idea of 'pickleBase' is to hide those 'marshal*(...)'
// procedures that are supposed to understand the 'text' format.

//
// Aux supporting stuff;
static
void putVerbatim(MarshalerBuffer *bs, const char *s)
{
  while (*s) {
    bs->put(*s);
    s++;
  }
}

//
#define oz_isalnum(c) ((c) >= 'a' && (c) <= 'z' || \
		       (c) >= 0337 && (c) <= 0366 || \
		       (c) >= 0370 && ((c) < 0377 || (c) == 0377) || \
		       (c) >= 'A' && (c) <= 'Z' || \
		       (c) >= 0300 && (c) <= 0326 || \
		       (c) >= 0330 && (c) <= 0336 || \
		       (c) >= '0' && (c) <= '9' || \
		       (c) == '_')

//
static inline
void putQuotedString(MarshalerBuffer *bs, const char *s)
{
  unsigned char c;
  bs->put('\'');
  while ((c = *s)) {
    if (c == '\'' || c == '\\') {
      bs->put('\\');
      bs->put(c);
    } else if (c >= 32 && c <= 126 || c >= 160) {
      bs->put(c);
    } else {
      bs->put('\\');
      switch (c) {
      case '\'':
	bs->put('\'');
	break;
      case '\a':
	bs->put('a');
	break;
      case '\b':
	bs->put('b');
	break;
      case '\f':
	bs->put('f');
	break;
      case '\n':
	bs->put('n');
	break;
      case '\r':
	bs->put('r');
	break;
      case '\t':
	bs->put('t');
	break;
      case '\v':
	bs->put('v');
	break;
      default:
	bs->put((char) (((c >> 6) & '\007') + '0'));
	bs->put((char) (((c >> 3) & '\007') + '0'));
	bs->put((char) (( c       & '\007') + '0'));
	break;
      }
    }
    s++;
  }
  bs->put('\'');
}

//
static
void putString(MarshalerBuffer *bs, const char *s)
{
  const char *t = s;
  unsigned char c = *t++;
  if (c == '\0' || !oz_isalnum(c)) {
    putQuotedString(bs, s);
  } else {
    c = *t++;
    while (c) {
      if (!oz_isalnum(c)) {
	putQuotedString(bs, s);
	return;
      }
      c = *t++;
    }
    while (*s) {
      bs->put(*s);
      s++;
    }
  }
}

//
static
void putNumber(PickleMarshalerBuffer *bs, unsigned int i)
{
  Assert(bs->textmode());
  char buf[100];
  sprintf(buf,"%u",i);
  putVerbatim(bs, buf);
}

//
static
void putTag(PickleMarshalerBuffer *bs, char tag)
{
  if (bs->textmode()) {
    switch (tag) {
      //  case TAG_DIF:
    case TAG_OPCODE:
    case TAG_LABELDEF:
      bs->put('\n');
      break;
    default:
      bs->put(' ');
      break;
    }
    bs->put(tag);
    bs->put(':');
  }
}

//
void marshalDIF(PickleMarshalerBuffer *bs, MarshalTag tag)
{
  if (bs->textmode()) {
    putTag(bs, TAG_DIF);
    putVerbatim(bs, dif_names[tag].name);
  } else {
    marshalDIF((MarshalerBuffer *) bs, tag);
  }
}

//
void marshalByte(PickleMarshalerBuffer *bs, unsigned char c)
{
  if (bs->textmode()) {
    putTag(bs, TAG_BYTE);
    putNumber(bs, c);
  } else { 
    marshalByte((MarshalerBuffer *) bs, c);
  }
}

//
void marshalShort(PickleMarshalerBuffer *bs, unsigned short i)
{
  if (bs->textmode()) {
    for (int k=0; k<shortSize; k++) {
      putTag(bs, TAG_BYTE);
      putNumber(bs, i&0xFF);
      i = i>>8;
    }
  } else {
    marshalShort((MarshalerBuffer *) bs, i);
  }
}

//
void marshalNumber(PickleMarshalerBuffer *bs, unsigned int i)
{
  if (bs->textmode()) {
    putTag(bs, TAG_INT);
    putNumber(bs, i);
  } else {
    marshalNumber((MarshalerBuffer *) bs, i);
  }
}

//
void marshalString(PickleMarshalerBuffer *bs, const char *s)
{
  if (bs->textmode()) {
    putTag(bs, TAG_STRING);
    putString(bs, s);
  } else {
    marshalString((MarshalerBuffer *) bs, s);
  }
}

//
void marshalLabel(PickleMarshalerBuffer *bs, int start, int lbl)
{
  if (bs->textmode()) {
    putTag(bs, TAG_LABELREF);
    putNumber(bs, start+lbl);
    return;
  } else {
    marshalLabel((MarshalerBuffer *)bs, start, lbl);
  }
}

//
void marshalOpCode(PickleMarshalerBuffer *bs, int lbl, Opcode op, Bool showLabel)
{
  if (bs->textmode()) {
    if (showLabel) {
      putTag(bs, TAG_LABELDEF);
      putNumber(bs, lbl);
    }
    putTag(bs, TAG_OPCODE);
    putVerbatim(bs, opcodeToString(op));
  } else {
    marshalOpCode((MarshalerBuffer *) bs, lbl, op, showLabel);
  }
}

//
void marshalCodeStart(PickleMarshalerBuffer *bs)
{	
  if (bs->textmode()) {
    putTag(bs, TAG_CODESTART);
    return;
  } else {
    marshalCodeStart((MarshalerBuffer *) bs);
  }
}

//
void marshalCodeEnd(PickleMarshalerBuffer *bs)
{	
  if (bs->textmode()) {
    putTag(bs, TAG_CODEEND);
  } else {
    marshalCodeEnd((MarshalerBuffer *) bs);
  }
}

//
void marshalTermDef(PickleMarshalerBuffer *bs, int lbl)
{
  if (bs->textmode()) {
    putTag(bs, TAG_TERMDEF);
    putNumber(bs, lbl);
  } else {
    marshalTermDef((MarshalerBuffer *) bs, lbl);
  }
}

//
void marshalTermRef(PickleMarshalerBuffer *bs, int lbl)
{
  if (bs->textmode()) {
    putTag(bs, TAG_TERMREF);
    putNumber(bs, lbl);
  } else {
    marshalTermRef((MarshalerBuffer *) bs, lbl);
  }
}

#if !defined(TEXT2PICKLE)

//
#define MARSHALERBUFFER		PickleMarshalerBuffer
#include "marshalerBaseShared.cc"
#undef  MARSHALERBUFFER

//
static
char *getString(PickleMarshalerBuffer *bs, unsigned int i)
{
  char *ret = new char[i+1];
  if (ret == (char *) 0)
    return ((char *) 0);
  for (unsigned int k=0; k<i; k++) {
    if (bs->atEnd()) {
      delete ret;
      return ((char *) 0);
    }
    ret[k] = bs->get();
  }
  ret[i] = '\0';
  return (ret);
}

//
char *unmarshalString(PickleMarshalerBuffer *bs)
{
  unsigned int i = unmarshalNumber(bs);
  return (getString(bs,i));
}

//
char *unmarshalVersionString(PickleMarshalerBuffer *bs)
{
  unsigned int i = bs->get();
  return getString(bs,i);
}

#endif

//
// The following sample code represents a practical implementation of the
// CRC (Cyclic Redundancy Check) employed in PNG chunks. (See also ISO
// 3309 [ISO-3309] or ITU-T V.42 [ITU-V42] for a formal specification.) 
//

// Table of CRCs of all 8-bit messages.
// CRC polynomial 0xedb88320
crc_t crc_table[256] = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d};

// Make the table for a fast CRC.
/*
static
void make_crc_table(void) 
{
  crc_t c;
  int n, k;
   
  for (n = 0; n < 256; n++) {
    c = (crc_t) n;
    for (k = 0; k < 8; k++) {
      if (c & 1)
	c = 0xedb88320L ^ (c >> 1);
      else
	c = c >> 1;
    }
    crc_table[n] = c;
  }
}
*/

/* Update a running CRC with the bytes buf[0..len-1]--the CRC
   should be initialized to all 1's, and the transmitted value
   is the 1's complement of the final running CRC (see the
   crc() routine below)). */

crc_t update_crc(crc_t crc, unsigned char *buf, int len) 
{
  crc_t c = crc;
  int n;

  for (n = 0; n < len; n++) {
    c = crc_table[(c ^ buf[n]) & 0xff] ^ (c >> 8);
  }
  return c;
}

//
char *makeHeader(crc_t crc, int *headerSize)
{
  static char buf[20];
  sprintf(buf,"%c%c%c%c%c%c%c",
	  SYSLETHEADER,SYSLETHEADER,SYSLETHEADER,
	  (char) (crc>> 0)&0xff,
	  (char) (crc>> 8)&0xff,
	  (char) (crc>>16)&0xff,
	  (char) (crc>>24)&0xff);
  *headerSize = 7;
  return buf;
}
