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/* Conversion module for Unicode
Copyright (C) 1999-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://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 ONE_DIRECTION 0
#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 (get16 (inptr) == BOM) \
/* Simply ignore the BOM character. */ \
*inptrp = inptr += 2; \
else if (get16 (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 (__glibc_unlikely (outbuf + 2 > outend)) \
return __GCONV_FULL_OUTPUT; \
\
put16 (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 (__glibc_unlikely (c >= 0x10000)) \
{ \
UNICODE_TAG_HANDLER (c, 4); \
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
else if (__glibc_unlikely (c >= 0xd800 && c < 0xe000)) \
{ \
/* 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_mark_illegal_input (step_data); \
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 (__glibc_unlikely (u1 >= 0xd800 && u1 < 0xe000)) \
{ \
/* 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>
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