[thirdparty/glibc.git] / iconvdata / unicode.c

/* Conversion module for Unicode
   Copyright (C) 1999-2014 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <byteswap.h>
#include <dlfcn.h>
#include <gconv.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

/* This is the Byte Order Mark character (BOM).  */
#define BOM	0xfeff
/* And in the other endian format.  */
#define BOM_OE	0xfffe


/* Definitions used in the body of the `gconv' function.  */
#define FROM_LOOP		from_unicode_loop
#define TO_LOOP			to_unicode_loop
#define DEFINE_INIT		0
#define DEFINE_FINI		0
#define MIN_NEEDED_FROM		2
#define MIN_NEEDED_TO		4
#define FROM_DIRECTION		(dir == from_unicode)
#define PREPARE_LOOP \
  enum direction dir = ((struct unicode_data *) step->__data)->dir;	      \
  int swap;								      \
  if (FROM_DIRECTION)							      \
    {									      \
      if (data->__invocation_counter == 0)				      \
	{								      \
	  /* We have to find out which byte order the file is encoded in.  */ \
	  if (inptr + 2 > inend)					      \
	    return (inptr == inend					      \
		    ? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT);	      \
									      \
	  if (get16u (inptr) == BOM)					      \
	    /* Simply ignore the BOM character.  */			      \
	    *inptrp = inptr += 2;					      \
	  else if (get16u (inptr) == BOM_OE)				      \
	    {								      \
	      data->__flags |= __GCONV_SWAP;				      \
	      *inptrp = inptr += 2;					      \
	    }								      \
	}								      \
    }									      \
  else if (!data->__internal_use && data->__invocation_counter == 0)	      \
    {									      \
      /* Emit the Byte Order Mark.  */					      \
      if (__builtin_expect (outbuf + 2 > outend, 0))			      \
	return __GCONV_FULL_OUTPUT;					      \
									      \
      put16u (outbuf, BOM);						      \
      outbuf += 2;							      \
    }									      \
  swap = data->__flags & __GCONV_SWAP;
#define EXTRA_LOOP_ARGS		, swap


/* Direction of the transformation.  */
enum direction
{
  illegal_dir,
  to_unicode,
  from_unicode
};

struct unicode_data
{
  enum direction dir;
};


extern int gconv_init (struct __gconv_step *step);
int
gconv_init (struct __gconv_step *step)
{
  /* Determine which direction.  */
  struct unicode_data *new_data;
  enum direction dir = illegal_dir;
  int result;

  if (strcmp (step->__from_name, "UNICODE//") == 0)
    dir = from_unicode;
  else
    dir = to_unicode;

  new_data = (struct unicode_data *) malloc (sizeof (struct unicode_data));

  result = __GCONV_NOMEM;
  if (new_data != NULL)
    {
      new_data->dir = dir;
      step->__data = new_data;

      if (dir == from_unicode)
	{
	  step->__min_needed_from = MIN_NEEDED_FROM;
	  step->__max_needed_from = MIN_NEEDED_FROM;
	  step->__min_needed_to = MIN_NEEDED_TO;
	  step->__max_needed_to = MIN_NEEDED_TO;
	}
      else
	{
	  step->__min_needed_from = MIN_NEEDED_TO;
	  step->__max_needed_from = MIN_NEEDED_TO;
	  step->__min_needed_to = MIN_NEEDED_FROM;
	  step->__max_needed_to = MIN_NEEDED_FROM;
	}

      step->__stateful = 0;

      result = __GCONV_OK;
    }

  return result;
}


extern void gconv_end (struct __gconv_step *data);
void
gconv_end (struct __gconv_step *data)
{
  free (data->__data);
}


/* Convert from the internal (UCS4-like) format to UCS2.  */
#define MIN_NEEDED_INPUT	MIN_NEEDED_TO
#define MIN_NEEDED_OUTPUT	MIN_NEEDED_FROM
#define LOOPFCT			TO_LOOP
#define BODY \
  {									      \
    uint32_t c = get32 (inptr);						      \
									      \
    if (__builtin_expect (c >= 0x10000, 0))				      \
      {									      \
	UNICODE_TAG_HANDLER (c, 4);					      \
	STANDARD_TO_LOOP_ERR_HANDLER (4);				      \
      }									      \
    else if (__builtin_expect (c >= 0xd800 && c < 0xe000, 0))		      \
      {									      \
	/* Surrogate characters in UCS-4 input are not valid.		      \
	   We must catch this, because the UCS-2 output might be	      \
	   interpreted as UTF-16 by other programs.  If we let		      \
	   surrogates pass through, attackers could make a security	      \
	   hole exploit by synthesizing any desired plane 1-16		      \
	   character.  */						      \
	result = __GCONV_ILLEGAL_INPUT;					      \
	if (! ignore_errors_p ())					      \
	  break;							      \
	inptr += 4;							      \
	++*irreversible;						      \
	continue;							      \
      }									      \
    else								      \
      {									      \
	put16 (outptr, c);						      \
	outptr += 2;							      \
      }									      \
									      \
    inptr += 4;								      \
  }
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS \
	, int swap
#include <iconv/loop.c>


/* Convert from UCS2 to the internal (UCS4-like) format.  */
#define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
#define LOOPFCT			FROM_LOOP
#define BODY \
  {									      \
    uint16_t u1 = get16 (inptr);					      \
									      \
    if (swap)								      \
      u1 = bswap_16 (u1);						      \
									      \
    if (__builtin_expect (u1 >= 0xd800 && u1 < 0xe000, 0))		      \
      {									      \
	/* Surrogate characters in UCS-2 input are not valid.  Reject	      \
	   them.  (Catching this here is not security relevant.)  */	      \
	STANDARD_FROM_LOOP_ERR_HANDLER (2);				      \
      }									      \
									      \
    put32 (outptr, u1);							      \
									      \
    inptr += 2;								      \
    outptr += 4;							      \
  }
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS \
	, int swap
#include <iconv/loop.c>


/* Now define the toplevel functions.  */
#include <iconv/skeleton.c>
Commit	Line	Data
8d617a71	1	/* Conversion module for Unicode
d4697bc9	2	Copyright (C) 1999-2014 Free Software Foundation, Inc.
8d617a71 UD	3	This file is part of the GNU C Library.
	4	Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
	5
	6	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	7	modify it under the terms of the GNU Lesser General Public
	8	License as published by the Free Software Foundation; either
	9	version 2.1 of the License, or (at your option) any later version.
8d617a71 UD	10
	11	The GNU C Library is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2	14	Lesser General Public License for more details.
8d617a71	15
41bdb6e2	16	You should have received a copy of the GNU Lesser General Public
59ba27a6 PE	17	License along with the GNU C Library; if not, see
59ba27a6 PE	18	<http://www.gnu.org/licenses/>. */
8d617a71 UD	19
8d617a71 UD	20	#include <byteswap.h>
55985355	21	#include <dlfcn.h>
8d617a71 UD	22	#include <gconv.h>
	23	#include <stddef.h>
	24	#include <stdint.h>
	25	#include <stdlib.h>
	26	#include <string.h>
	27
	28	/* This is the Byte Order Mark character (BOM). */
	29	#define BOM 0xfeff
	30	/* And in the other endian format. */
	31	#define BOM_OE 0xfffe
	32
	33
	34	/* Definitions used in the body of the `gconv' function. */
	35	#define FROM_LOOP from_unicode_loop
	36	#define TO_LOOP to_unicode_loop
	37	#define DEFINE_INIT 0
	38	#define DEFINE_FINI 0
	39	#define MIN_NEEDED_FROM 2
	40	#define MIN_NEEDED_TO 4
	41	#define FROM_DIRECTION (dir == from_unicode)
	42	#define PREPARE_LOOP \
	43	enum direction dir = ((struct unicode_data *) step->__data)->dir; \
	44	int swap; \
	45	if (FROM_DIRECTION) \
	46	{ \
	47	if (data->__invocation_counter == 0) \
	48	{ \
	49	/* We have to find out which byte order the file is encoded in. */ \
fd1b5c0f	50	if (inptr + 2 > inend) \
eb9dc2a2 UD	51	return (inptr == inend \
eb9dc2a2 UD	52	? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT); \
8d617a71	53	\
77e1d15a	54	if (get16u (inptr) == BOM) \
8d617a71	55	/* Simply ignore the BOM character. */ \
b721a2c0	56	*inptrp = inptr += 2; \
77e1d15a	57	else if (get16u (inptr) == BOM_OE) \
8d617a71	58	{ \
ee190f67	59	data->__flags \|= __GCONV_SWAP; \
b721a2c0	60	*inptrp = inptr += 2; \
8d617a71 UD	61	} \
	62	} \
	63	} \
	64	else if (!data->__internal_use && data->__invocation_counter == 0) \
	65	{ \
	66	/* Emit the Byte Order Mark. */ \
ee4ce289	67	if (__builtin_expect (outbuf + 2 > outend, 0)) \
8d617a71 UD	68	return __GCONV_FULL_OUTPUT; \
8d617a71 UD	69	\
77e1d15a	70	put16u (outbuf, BOM); \
8d617a71 UD	71	outbuf += 2; \
8d617a71 UD	72	} \
ee190f67	73	swap = data->__flags & __GCONV_SWAP;
55985355	74	#define EXTRA_LOOP_ARGS , swap
8d617a71 UD	75
	76
	77	/* Direction of the transformation. */
	78	enum direction
	79	{
	80	illegal_dir,
	81	to_unicode,
	82	from_unicode
	83	};
	84
	85	struct unicode_data
	86	{
	87	enum direction dir;
8d617a71 UD	88	};
	89
	90
8c0b7170	91	extern int gconv_init (struct __gconv_step *step);
8d617a71 UD	92	int
	93	gconv_init (struct __gconv_step *step)
	94	{
	95	/* Determine which direction. */
	96	struct unicode_data *new_data;
	97	enum direction dir = illegal_dir;
	98	int result;
	99
a8f6cd90	100	if (strcmp (step->__from_name, "UNICODE//") == 0)
8d617a71 UD	101	dir = from_unicode;
	102	else
	103	dir = to_unicode;
	104
	105	new_data = (struct unicode_data *) malloc (sizeof (struct unicode_data));
	106
	107	result = __GCONV_NOMEM;
	108	if (new_data != NULL)
	109	{
	110	new_data->dir = dir;
8d617a71 UD	111	step->__data = new_data;
	112
	113	if (dir == from_unicode)
	114	{
	115	step->__min_needed_from = MIN_NEEDED_FROM;
	116	step->__max_needed_from = MIN_NEEDED_FROM;
	117	step->__min_needed_to = MIN_NEEDED_TO;
	118	step->__max_needed_to = MIN_NEEDED_TO;
	119	}
	120	else
	121	{
	122	step->__min_needed_from = MIN_NEEDED_TO;
	123	step->__max_needed_from = MIN_NEEDED_TO;
	124	step->__min_needed_to = MIN_NEEDED_FROM;
	125	step->__max_needed_to = MIN_NEEDED_FROM;
	126	}
	127
	128	step->__stateful = 0;
	129
	130	result = __GCONV_OK;
	131	}
	132
	133	return result;
	134	}
	135
	136
8c0b7170	137	extern void gconv_end (struct __gconv_step *data);
8d617a71 UD	138	void
	139	gconv_end (struct __gconv_step *data)
	140	{
	141	free (data->__data);
	142	}
	143
	144
	145	/* Convert from the internal (UCS4-like) format to UCS2. */
	146	#define MIN_NEEDED_INPUT MIN_NEEDED_TO
	147	#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
	148	#define LOOPFCT TO_LOOP
	149	#define BODY \
	150	{ \
77e1d15a	151	uint32_t c = get32 (inptr); \
8d617a71	152	\
db2d05f9	153	if (__builtin_expect (c >= 0x10000, 0)) \
8d617a71	154	{ \
601d2942	155	UNICODE_TAG_HANDLER (c, 4); \
e438a468	156	STANDARD_TO_LOOP_ERR_HANDLER (4); \
85830c4c	157	} \
755104ed UD	158	else if (__builtin_expect (c >= 0xd800 && c < 0xe000, 0)) \
	159	{ \
	160	/* Surrogate characters in UCS-4 input are not valid. \
	161	We must catch this, because the UCS-2 output might be \
	162	interpreted as UTF-16 by other programs. If we let \
	163	surrogates pass through, attackers could make a security \
	164	hole exploit by synthesizing any desired plane 1-16 \
	165	character. */ \
e438a468	166	result = __GCONV_ILLEGAL_INPUT; \
755104ed	167	if (! ignore_errors_p ()) \
e438a468	168	break; \
755104ed UD	169	inptr += 4; \
	170	++*irreversible; \
	171	continue; \
	172	} \
85830c4c UD	173	else \
	174	{ \
	175	put16 (outptr, c); \
	176	outptr += 2; \
	177	} \
8d617a71	178	\
8d617a71 UD	179	inptr += 4; \
8d617a71 UD	180	}
55985355	181	#define LOOP_NEED_FLAGS
8d617a71	182	#define EXTRA_LOOP_DECLS \
55985355	183	, int swap
8d617a71 UD	184	#include <iconv/loop.c>
	185
	186
	187	/* Convert from UCS2 to the internal (UCS4-like) format. */
	188	#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
	189	#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
	190	#define LOOPFCT FROM_LOOP
	191	#define BODY \
	192	{ \
77e1d15a	193	uint16_t u1 = get16 (inptr); \
8d617a71 UD	194	\
	195	if (swap) \
	196	u1 = bswap_16 (u1); \
	197	\
755104ed UD	198	if (__builtin_expect (u1 >= 0xd800 && u1 < 0xe000, 0)) \
	199	{ \
	200	/* Surrogate characters in UCS-2 input are not valid. Reject \
	201	them. (Catching this here is not security relevant.) */ \
e438a468	202	STANDARD_FROM_LOOP_ERR_HANDLER (2); \
755104ed UD	203	} \
755104ed UD	204	\
77e1d15a	205	put32 (outptr, u1); \
8d617a71 UD	206	\
	207	inptr += 2; \
	208	outptr += 4; \
	209	}
755104ed	210	#define LOOP_NEED_FLAGS
8d617a71	211	#define EXTRA_LOOP_DECLS \
55985355	212	, int swap
8d617a71 UD	213	#include <iconv/loop.c>
	214
	215
	216	/* Now define the toplevel functions. */
	217	#include <iconv/skeleton.c>