text: /*-
   * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
   * Redistribution and modifications are permitted subject to BSD license.
   */
  #include <asn_internal.h>
  #include <UniversalString.h>
  #include <UTF8String.h>
  
  /*
   * UniversalString basic type description.
   */
  static const ber_tlv_tag_t asn_DEF_UniversalString_tags[] = {
  	(ASN_TAG_CLASS_UNIVERSAL | (28 << 2)),	/* [UNIVERSAL 28] IMPLICIT ...*/
  	(ASN_TAG_CLASS_UNIVERSAL | (4 << 2))	/* ... OCTET STRING */
  };
  static asn_OCTET_STRING_specifics_t asn_DEF_UniversalString_specs = {
  	sizeof(UniversalString_t),
  	offsetof(UniversalString_t, _asn_ctx),
  	ASN_OSUBV_U32	/* 32-bits character */
  };
  static asn_per_constraints_t asn_DEF_UniversalString_constraints = {
  	{ APC_CONSTRAINED, 32, 32, 0, 2147483647 },
  	{ APC_SEMI_CONSTRAINED, -1, -1, 0, 0 },
  	0, 0
  };
  asn_TYPE_descriptor_t asn_DEF_UniversalString = {
  	"UniversalString",
  	"UniversalString",
  	OCTET_STRING_free,
  	UniversalString_print,      /* Convert into UTF8 and print */
  	asn_generic_no_constraint,
  	OCTET_STRING_decode_ber,
  	OCTET_STRING_encode_der,
  	UniversalString_decode_xer,	/* Convert from UTF-8 */
  	UniversalString_encode_xer,	/* Convert into UTF-8 */
  	OCTET_STRING_decode_uper,
  	OCTET_STRING_encode_uper,
  	0, /* Use generic outmost tag fetcher */
  	asn_DEF_UniversalString_tags,
  	sizeof(asn_DEF_UniversalString_tags)
  	  / sizeof(asn_DEF_UniversalString_tags[0]) - 1,
  	asn_DEF_UniversalString_tags,
  	sizeof(asn_DEF_UniversalString_tags)
  	  / sizeof(asn_DEF_UniversalString_tags[0]),
  	&asn_DEF_UniversalString_constraints,
  	0, 0,	/* No members */
  	&asn_DEF_UniversalString_specs
  };
  
  
  static ssize_t
  UniversalString__dump(const UniversalString_t *st,
  		asn_app_consume_bytes_f *cb, void *app_key) {
  	char scratch[128];			/* Scratchpad buffer */
  	char *p = scratch;
  	ssize_t wrote = 0;
  	uint8_t *ch;
  	uint8_t *end;
  
  	ch = st->buf;
  	end = (st->buf + st->size);
  	for(end -= 3; ch < end; ch += 4) {
  		uint32_t wc =     (ch[0] << 24)
  				| (ch[1] << 16)
  				| (ch[2] << 8)
  				|  ch[3];	/* 4 bytes */
  		if(sizeof(scratch) - (p - scratch) < 6) {
  			wrote += p - scratch;
  			if(cb(scratch, p - scratch, app_key) < 0)
  				return -1;
  			p = scratch;
  		}
  		if(wc < 0x80) {
  			*p++ = (char)wc;
  		} else if(wc < 0x800) {
  			*p++ = 0xc0 | ((wc >> 6));
  			*p++ = 0x80 | ((wc & 0x3f));
  		} else if(wc < 0x10000) {
  			*p++ = 0xe0 | ((wc >> 12));
  			*p++ = 0x80 | ((wc >> 6) & 0x3f);
  			*p++ = 0x80 | ((wc & 0x3f));
  		} else if(wc < 0x200000) {
  			*p++ = 0xf0 | ((wc >> 18));
  			*p++ = 0x80 | ((wc >> 12) & 0x3f);
  			*p++ = 0x80 | ((wc >> 6) & 0x3f);
  			*p++ = 0x80 | ((wc & 0x3f));
  		} else if(wc < 0x4000000) {
  			*p++ = 0xf8 | ((wc >> 24));
  			*p++ = 0x80 | ((wc >> 18) & 0x3f);
  			*p++ = 0x80 | ((wc >> 12) & 0x3f);
  			*p++ = 0x80 | ((wc >> 6) & 0x3f);
  			*p++ = 0x80 | ((wc & 0x3f));
  		} else {
  			*p++ = 0xfc | ((wc >> 30) & 0x1);
  			*p++ = 0x80 | ((wc >> 24) & 0x3f);
  			*p++ = 0x80 | ((wc >> 18) & 0x3f);
  			*p++ = 0x80 | ((wc >> 12) & 0x3f);
  			*p++ = 0x80 | ((wc >> 6) & 0x3f);
  			*p++ = 0x80 | ((wc & 0x3f));
  		}
  	}
  
  	wrote += p - scratch;
  	if(cb(scratch, p - scratch, app_key) < 0)
  		return -1;
  
  	return wrote;
  }
  
  asn_dec_rval_t
  UniversalString_decode_xer(asn_codec_ctx_t *opt_codec_ctx,
  	asn_TYPE_descriptor_t *td, void **sptr,
  		const char *opt_mname, const void *buf_ptr, size_t size) {
  	asn_dec_rval_t rc;
  
  	rc = OCTET_STRING_decode_xer_utf8(opt_codec_ctx, td, sptr, opt_mname,
  		buf_ptr, size);
  	if(rc.code == RC_OK) {
  		/*
  		 * Now we have a whole string in UTF-8 format.
  		 * Convert it into UCS-4.
  		 */
  		uint32_t *wcs;
  		size_t wcs_len;
  		UTF8String_t *st;
  #ifndef	WORDS_BIGENDIAN
  		int little_endian = 1;
  #endif
  
  		assert(*sptr);
  		st = (UTF8String_t *)*sptr;
  		assert(st->buf);
  		wcs_len = UTF8String_to_wcs(st, 0, 0);
  
  		wcs = (uint32_t *)MALLOC(4 * (wcs_len + 1));
  		if(wcs == 0 || UTF8String_to_wcs(st, wcs, wcs_len) != wcs_len) {
  			rc.code = RC_FAIL;
  			rc.consumed = 0;
  			return rc;
  		} else {
  			wcs[wcs_len] = 0;	/* nul-terminate */
  		}
  
  #ifndef	WORDS_BIGENDIAN
  		if(*(char *)&little_endian) {
  			/* Swap byte order in encoding */
  			uint32_t *wc = wcs;
  			uint32_t *wc_end = wcs + wcs_len;
  			for(; wc < wc_end; wc++) {
  				/* *wc = htonl(*wc); */
  				uint32_t wch = *wc;
  				*((uint8_t *)wc + 0) = wch >> 24;
  				*((uint8_t *)wc + 1) = wch >> 16;
  				*((uint8_t *)wc + 2) = wch >> 8;
  				*((uint8_t *)wc + 3) = wch;
  			}
  		}
  #endif	/* WORDS_BIGENDIAN */
  
  		FREEMEM(st->buf);
  		st->buf = (uint8_t *)wcs;
  		st->size = 4 * wcs_len;
  	}
  	return rc;
  }
  
  asn_enc_rval_t
  UniversalString_encode_xer(asn_TYPE_descriptor_t *td, void *sptr,
  	int ilevel, enum xer_encoder_flags_e flags,
  		asn_app_consume_bytes_f *cb, void *app_key) {
  	const UniversalString_t *st = (const UniversalString_t *)sptr;
  	asn_enc_rval_t er;
  
  	(void)ilevel;
  	(void)flags;
  
  	if(!st || !st->buf)
  		_ASN_ENCODE_FAILED;
  
  	er.encoded = UniversalString__dump(st, cb, app_key);
  	if(er.encoded < 0) _ASN_ENCODE_FAILED;
  
  	_ASN_ENCODED_OK(er);
  }
  
  int
  UniversalString_print(asn_TYPE_descriptor_t *td, const void *sptr, int ilevel,
  	asn_app_consume_bytes_f *cb, void *app_key) {
  	const UniversalString_t *st = (const UniversalString_t *)sptr;
  
  	(void)td;	/* Unused argument */
  	(void)ilevel;	/* Unused argument */
  
  	if(!st || !st->buf) return (cb("<absent>", 8, app_key) < 0) ? -1 : 0;
  
  	if(UniversalString__dump(st, cb, app_key) < 0)
  		return -1;
  
  	return 0;
  }
  
  