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ldif.c

/*
 * $Id: ldif.c,v 1.5 2005/07/29 06:28:55 jheinonen Exp $
 * 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 = malloc(bufsize)) == NULL) {
            return NULL;
      }

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

      return (buf);
}

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