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glibc/iconvdata/utf-16.c
Siddhesh Poyarekar 30891f35fa Remove "Contributed by" lines 
We stopped adding "Contributed by" or similar lines in sources in 2012
in favour of git logs and keeping the Contributors section of the
glibc manual up to date.  Removing these lines makes the license
header a bit more consistent across files and also removes the
possibility of error in attribution when license blocks or files are
copied across since the contributed-by lines don't actually reflect
reality in those cases.

Move all "Contributed by" and similar lines (Written by, Test by,
etc.) into a new file CONTRIBUTED-BY to retain record of these
contributions.  These contributors are also mentioned in
manual/contrib.texi, so we just maintain this additional record as a
courtesy to the earlier developers.

The following scripts were used to filter a list of files to edit in
place and to clean up the CONTRIBUTED-BY file respectively.  These
were not added to the glibc sources because they're not expected to be
of any use in future given that this is a one time task:

https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc
https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-09-03 22:06:44 +05:30

377 lines
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/* Conversion module for UTF-16.
Copyright (C) 1999-2021 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 byte order. */
#define BOM_OE 0xfffe
/* Definitions used in the body of the `gconv' function. */
#define FROM_LOOP from_utf16_loop
#define TO_LOOP to_utf16_loop
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 2
#define MAX_NEEDED_FROM 4
#define MIN_NEEDED_TO 4
#define ONE_DIRECTION 0
#define FROM_DIRECTION (dir == from_utf16)
#define PREPARE_LOOP \
enum direction dir = ((struct utf16_data *) step->__data)->dir; \
enum variant var = ((struct utf16_data *) step->__data)->var; \
if (__glibc_unlikely (data->__invocation_counter == 0)) \
{ \
if (var == UTF_16) \
{ \
if (FROM_DIRECTION) \
{ \
/* 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 (!FROM_DIRECTION && !data->__internal_use) \
{ \
/* Emit the Byte Order Mark. */ \
if (__glibc_unlikely (outbuf + 2 > outend)) \
return __GCONV_FULL_OUTPUT; \
\
put16u (outbuf, BOM); \
outbuf += 2; \
} \
} \
else if ((var == UTF_16LE && BYTE_ORDER == BIG_ENDIAN) \
|| (var == UTF_16BE && BYTE_ORDER == LITTLE_ENDIAN)) \
data->__flags |= __GCONV_SWAP; \
} \
const int swap = data->__flags & __GCONV_SWAP;
#define EXTRA_LOOP_ARGS , swap
/* Direction of the transformation. */
enum direction
{
illegal_dir,
to_utf16,
from_utf16
};
enum variant
{
illegal_var,
UTF_16,
UTF_16LE,
UTF_16BE
};
struct utf16_data
{
enum direction dir;
enum variant var;
};
extern int gconv_init (struct __gconv_step *step);
int
gconv_init (struct __gconv_step *step)
{
/* Determine which direction. */
struct utf16_data *new_data;
enum direction dir = illegal_dir;
enum variant var = illegal_var;
int result;
if (__strcasecmp (step->__from_name, "UTF-16//") == 0)
{
dir = from_utf16;
var = UTF_16;
}
else if (__strcasecmp (step->__to_name, "UTF-16//") == 0)
{
dir = to_utf16;
var = UTF_16;
}
else if (__strcasecmp (step->__from_name, "UTF-16BE//") == 0)
{
dir = from_utf16;
var = UTF_16BE;
}
else if (__strcasecmp (step->__to_name, "UTF-16BE//") == 0)
{
dir = to_utf16;
var = UTF_16BE;
}
else if (__strcasecmp (step->__from_name, "UTF-16LE//") == 0)
{
dir = from_utf16;
var = UTF_16LE;
}
else if (__strcasecmp (step->__to_name, "UTF-16LE//") == 0)
{
dir = to_utf16;
var = UTF_16LE;
}
result = __GCONV_NOCONV;
if (__builtin_expect (dir, to_utf16) != illegal_dir)
{
new_data = (struct utf16_data *) malloc (sizeof (struct utf16_data));
result = __GCONV_NOMEM;
if (new_data != NULL)
{
new_data->dir = dir;
new_data->var = var;
step->__data = new_data;
if (dir == from_utf16)
{
step->__min_needed_from = MIN_NEEDED_FROM;
step->__max_needed_from = MAX_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 = MAX_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 UTF-16. */
#define MIN_NEEDED_INPUT MIN_NEEDED_TO
#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM
#define LOOPFCT TO_LOOP
#define BODY \
{ \
uint32_t c = get32 (inptr); \
\
if (__glibc_unlikely (c >= 0xd800 && c < 0xe000)) \
{ \
/* Surrogate characters in UCS-4 input are not valid. \
We must catch this. 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; \
} \
\
if (swap) \
{ \
if (__glibc_unlikely (c >= 0x10000)) \
{ \
if (__glibc_unlikely (c >= 0x110000)) \
{ \
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
\
/* Generate a surrogate character. */ \
if (__glibc_unlikely (outptr + 4 > outend)) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
put16 (outptr, bswap_16 (0xd7c0 + (c >> 10))); \
outptr += 2; \
put16 (outptr, bswap_16 (0xdc00 + (c & 0x3ff))); \
} \
else \
put16 (outptr, bswap_16 (c)); \
} \
else \
{ \
if (__glibc_unlikely (c >= 0x10000)) \
{ \
if (__glibc_unlikely (c >= 0x110000)) \
{ \
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
\
/* Generate a surrogate character. */ \
if (__glibc_unlikely (outptr + 4 > outend)) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
put16 (outptr, 0xd7c0 + (c >> 10)); \
outptr += 2; \
put16 (outptr, 0xdc00 + (c & 0x3ff)); \
} \
else \
put16 (outptr, c); \
} \
outptr += 2; \
inptr += 4; \
}
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS \
, int swap
#include <iconv/loop.c>
/* Convert from UTF-16 to the internal (UCS4-like) format. */
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT MAX_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, 1) || u1 > 0xdfff) \
{ \
/* No surrogate. */ \
put32 (outptr, u1); \
inptr += 2; \
} \
else \
{ \
uint16_t u2; \
\
if (__glibc_unlikely (u1 >= 0xdc00)) \
{ \
/* This is no valid first word for a surrogate. */ \
STANDARD_FROM_LOOP_ERR_HANDLER (2); \
} \
\
/* It's a surrogate character. At least the first word says \
it is. */ \
if (__glibc_unlikely (inptr + 4 > inend)) \
{ \
/* We don't have enough input for another complete input \
character. */ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
inptr += 2; \
u2 = bswap_16 (get16 (inptr)); \
if (__builtin_expect (u2 < 0xdc00, 0) \
|| __builtin_expect (u2 > 0xdfff, 0)) \
{ \
/* This is no valid second word for a surrogate. */ \
inptr -= 2; \
STANDARD_FROM_LOOP_ERR_HANDLER (2); \
} \
\
put32 (outptr, ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00)); \
inptr += 2; \
} \
} \
else \
{ \
if (__builtin_expect (u1 < 0xd800, 1) || u1 > 0xdfff) \
{ \
/* No surrogate. */ \
put32 (outptr, u1); \
inptr += 2; \
} \
else \
{ \
if (__glibc_unlikely (u1 >= 0xdc00)) \
{ \
/* This is no valid first word for a surrogate. */ \
STANDARD_FROM_LOOP_ERR_HANDLER (2); \
} \
\
/* It's a surrogate character. At least the first word says \
it is. */ \
if (__glibc_unlikely (inptr + 4 > inend)) \
{ \
/* We don't have enough input for another complete input \
character. */ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
inptr += 2; \
uint16_t u2 = get16 (inptr); \
if (__builtin_expect (u2 < 0xdc00, 0) \
|| __builtin_expect (u2 > 0xdfff, 0)) \
{ \
/* This is no valid second word for a surrogate. */ \
inptr -= 2; \
STANDARD_FROM_LOOP_ERR_HANDLER (2); \
} \
\
put32 (outptr, ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00)); \
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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