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ldif.c

/*
 * adapted to use with abook by JH <jheinonen@users.sourceforge.net>
 */

/*
 *
 * Copyright (c) 1992-1996 Regents of the University of Michigan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of Michigan at Ann Arbor. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission. This software
 * is provided ``as is'' without express or implied warranty.
 *
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "ldif.h"

#define ISSPACE(c) isspace((unsigned char)c)

#define LDAP_DEBUG_PARSE      0x800
#define LDAP_DEBUG_ANY        0xffff
#define LDIF_LINE_WIDTH       76      /* maximum length of LDIF lines */
#define LDIF_BASE64_LEN(vlen) (((vlen) * 4 / 3 ) + 3)

#define LDIF_SIZE_NEEDED(tlen,vlen) \
      ((tlen) + 4 + LDIF_BASE64_LEN(vlen) \
     + ((LDIF_BASE64_LEN(vlen) + tlen + 3) / LDIF_LINE_WIDTH * 2 ))


#define Debug( level, fmt, arg1, arg2, arg3 )

#define RIGHT2                0x03
#define RIGHT4                0x0f
#define CONTINUED_LINE_MARKER '\001'

static char nib2b64[0x40f] =
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

static unsigned char b642nib[0x80] = {
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
      0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
      0x3c, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
      0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
      0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
      0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
      0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
      0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
      0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
      0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff
};

/*
 * str_parse_line - takes a line of the form "type:[:] value" and splits it
 * into components "type" and "value".  if a double colon separates type from
 * value, then value is encoded in base 64, and parse_line un-decodes it
 * (in place) before returning.
 */

int
str_parse_line(
    char    *line,
    char    **type,
    char    **value,
    int           *vlen
)
{
      char  *p, *s, *d, *byte, *stop;
      char  nib;
      int   i, b64;

      /* skip any leading space */
      while ( ISSPACE( *line ) ) {
            line++;
      }
      *type = line;

      for ( s = line; *s && *s != ':'; s++ )
            ;     /* NULL */
      if ( *s == '\0' ) {
            Debug( LDAP_DEBUG_PARSE, "parse_line missing ':'\n", 0, 0, 0 );
            return( -1 );
      }

      /* trim any space between type and : */
      for ( p = s - 1; p > line && ISSPACE( *p ); p-- ) {
            *p = '\0';
      }
      *s++ = '\0';

      /* check for double : - indicates base 64 encoded value */
      if ( *s == ':' ) {
            s++;
            b64 = 1;

      /* single : - normally encoded value */
      } else {
            b64 = 0;
      }

      /* skip space between : and value */
      while ( ISSPACE( *s ) ) {
            s++;
      }

      /* if no value is present, error out */
      if ( *s == '\0' ) {
            Debug( LDAP_DEBUG_PARSE, "parse_line missing value\n", 0,0,0 );
            return( -1 );
      }

      /* check for continued line markers that should be deleted */
      for ( p = s, d = s; *p; p++ ) {
            if ( *p != CONTINUED_LINE_MARKER )
                  *d++ = *p;
      }
      *d = '\0';

      *value = s;
      if ( b64 ) {
            stop = strchr( s, '\0' );
            byte = s;
            for ( p = s, *vlen = 0; p < stop; p += 4, *vlen += 3 ) {
                  for ( i = 0; i < 3; i++ ) {
                        if ( p[i] != '=' && (p[i] & 0x80 ||
                            b642nib[ p[i] & 0x7f ] > 0x3f) ) {
                              Debug( LDAP_DEBUG_ANY,
                            "invalid base 64 encoding char (%c) 0x%x\n",
                                  p[i], p[i], 0 );
                              return( -1 );
                        }
                  }

                  /* first digit */
                  nib = b642nib[ p[0] & 0x7f ];
                  byte[0] = nib << 2;
                  /* second digit */
                  nib = b642nib[ p[1] & 0x7f ];
                  byte[0] |= nib >> 4;
                  byte[1] = (nib & RIGHT4) << 4;
                  /* third digit */
                  if ( p[2] == '=' ) {
                        *vlen += 1;
                        break;
                  }
                  nib = b642nib[ p[2] & 0x7f ];
                  byte[1] |= nib >> 2;
                  byte[2] = (nib & RIGHT2) << 6;
                  /* fourth digit */
                  if ( p[3] == '=' ) {
                        *vlen += 2;
                        break;
                  }
                  nib = b642nib[ p[3] & 0x7f ];
                  byte[2] |= nib;

                  byte += 3;
            }
            s[ *vlen ] = '\0';
      } else {
            *vlen = (int) (d - s);
      }

      return( 0 );
}

#if 0

/*
 * str_getline - return the next "line" (minus newline) of input from a
 * string buffer of lines separated by newlines, terminated by \n\n
 * or \0.  this routine handles continued lines, bundling them into
 * a single big line before returning.  if a line begins with a white
 * space character, it is a continuation of the previous line. the white
 * space character (nb: only one char), and preceeding newline are changed
 * into CONTINUED_LINE_MARKER chars, to be deleted later by the
 * str_parse_line() routine above.
 *
 * it takes a pointer to a pointer to the buffer on the first call,
 * which it updates and must be supplied on subsequent calls.
 */

char *
str_getline( char **next )
{
      char  *l;
      char  c;

      if ( *next == NULL || **next == '\n' || **next == '\0' ) {
            return( NULL );
      }

      l = *next;
      while ( (*next = strchr( *next, '\n' )) != NULL ) {
            c = *(*next + 1);
            if ( ISSPACE( c ) && c != '\n' ) {
                  **next = CONTINUED_LINE_MARKER;
                  *(*next+1) = CONTINUED_LINE_MARKER;
            } else {
                  *(*next)++ = '\0';
                  break;
            }
            (*next)++;
      }

      return( l );
}

#endif

void
put_type_and_value( char **out, char *t, char *val, int vlen )
{
      unsigned char     *byte, *p, *stop;
      unsigned char     buf[3];
      unsigned long     bits;
      char        *save;
      int         i, b64, pad, len, savelen;
      len = 0;

      /* put the type + ": " */
      for ( p = (unsigned char *) t; *p; p++, len++ ) {
            *(*out)++ = *p;
      }
      *(*out)++ = ':';
      len++;
      save = *out;
      savelen = len;
      *(*out)++ = ' ';
      b64 = 0;

      stop = (unsigned char *) (val + vlen);
      if ( isascii( val[0] ) && (ISSPACE( val[0] ) || val[0] == ':') ) {
            b64 = 1;
      } else {
            for ( byte = (unsigned char *) val; byte < stop;
                byte++, len++ ) {
                  if ( !isascii( *byte ) || !isprint( *byte ) ) {
                        b64 = 1;
                        break;
                  }
                  if ( len > LDIF_LINE_WIDTH ) {
                        *(*out)++ = '\n';
                        *(*out)++ = ' ';
                        len = 1;
                  }
                  *(*out)++ = *byte;
            }
      }
      if ( b64 ) {
            *out = save;
            *(*out)++ = ':';
            *(*out)++ = ' ';
            len = savelen + 2;
            /* convert to base 64 (3 bytes => 4 base 64 digits) */
            for ( byte = (unsigned char *) val; byte < stop - 2;
                byte += 3 ) {
                  bits = (byte[0] & 0xff) << 16;
                  bits |= (byte[1] & 0xff) << 8;
                  bits |= (byte[2] & 0xff);

                  for ( i = 0; i < 4; i++, len++, bits <<= 6 ) {
                        if ( len > LDIF_LINE_WIDTH ) {
                              *(*out)++ = '\n';
                              *(*out)++ = ' ';
                              len = 1;
                        }

                        /* get b64 digit from high order 6 bits */
                        *(*out)++ = nib2b64[ (bits & 0xfc0000L) >> 18 ];
                  }
            }

            /* add padding if necessary */
            if ( byte < stop ) {
                  for ( i = 0; byte + i < stop; i++ ) {
                        buf[i] = byte[i];
                  }
                  for ( pad = 0; i < 3; i++, pad++ ) {
                        buf[i] = '\0';
                  }
                  byte = buf;
                  bits = (byte[0] & 0xff) << 16;
                  bits |= (byte[1] & 0xff) << 8;
                  bits |= (byte[2] & 0xff);

                  for ( i = 0; i < 4; i++, len++, bits <<= 6 ) {
                        if ( len > LDIF_LINE_WIDTH ) {
                              *(*out)++ = '\n';
                              *(*out)++ = ' ';
                              len = 1;
                        }

                        /* get b64 digit from low order 6 bits */
                        *(*out)++ = nib2b64[ (bits & 0xfc0000L) >> 18 ];
                  }

                  for ( ; pad > 0; pad-- ) {
                        *(*out - pad) = '=';
                  }
            }
      }
      *(*out)++ = '\n';
}


char *
ldif_type_and_value( char *type, char *val, int vlen )
/*
 * return malloc'd, zero-terminated LDIF line
 */
{
    char    *buf, *p;
    int           tlen;
    size_t  bufsize, t;

    tlen = strlen( type );

    t = LDIF_SIZE_NEEDED( tlen, vlen );
    if((bufsize = t + 1) <= t)
        return NULL;

    if (( buf = (char *)malloc( bufsize )) == NULL ) {
      return NULL;
    }

    p = buf;
    put_type_and_value( &p, type, val, vlen );
    *p = '\0';

    return( buf );
}


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