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glibc/iconv/gconv_simple.c
Florian Weimer 6cbf845fcd iconv: Preserve iconv -c error exit on invalid inputs (bug 32046) 
In several converters, a __GCONV_ILLEGAL_INPUT result gets overwritten
with __GCONV_FULL_OUTPUT.  As a result, iconv (the function) returns
E2BIG instead of EILSEQ.  The iconv program does not see the original
EILSEQ failure, does not recognize the invalid input, and may
incorrectly exit successfully.

To address this, a new __flags bit is used to indicate a sticky input
error state.  All __GCONV_ILLEGAL_INPUT results are replaced with a
function call that sets this new __GCONV_ENCOUNTERED_ILLEGAL_INPUT and
returns __GCONV_ILLEGAL_INPUT.  The iconv program checks for
__GCONV_ENCOUNTERED_ILLEGAL_INPUT and overrides the exit status.

The converter changes introducing __gconv_mark_illegal_input are
mostly mechanical, except for the res variable initialization in
iconvdata/iso-2022-jp.c: this error gets overwritten with __GCONV_OK
and other results in the following code.  If res ==
__GCONV_ILLEGAL_INPUT afterwards, STANDARD_TO_LOOP_ERR_HANDLER below
will handle it.

The __gconv_mark_illegal_input changes do not alter the errno value
set by the iconv function.  This is simpler to implement than
reviewing each __GCONV_FULL_OUTPUT result and adjust it not to
override a previous __GCONV_ILLEGAL_INPUT result.  Doing it that way
would also change some E2BIG errors in to EILSEQ errors, so it had to
be done conditionally (under a flag set by the iconv program only), to
avoid confusing buffer management in other applications.

Reviewed-by: DJ Delorie <dj@redhat.com>
2024-09-20 13:51:09 +02:00

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/* Simple transformations functions.
Copyright (C) 1997-2024 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 <endian.h>
#include <errno.h>
#include <gconv.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <sys/param.h>
#include <gconv_int.h>
#define BUILTIN_ALIAS(s1, s2) /* nothing */
#define BUILTIN_TRANSFORMATION(From, To, Cost, Name, Fct, BtowcFct, \
MinF, MaxF, MinT, MaxT) \
extern int Fct (struct __gconv_step *, struct __gconv_step_data *, \
const unsigned char **, const unsigned char *, \
unsigned char **, size_t *, int, int);
#include "gconv_builtin.h"
#ifndef EILSEQ
# define EILSEQ EINVAL
#endif
/* Specialized conversion function for a single byte to INTERNAL, recognizing
only ASCII characters. */
wint_t
__gconv_btwoc_ascii (struct __gconv_step *step, unsigned char c)
{
if (c < 0x80)
return c;
else
return WEOF;
}
/* Transform from the internal, UCS4-like format, to UCS4. The
difference between the internal ucs4 format and the real UCS4
format is, if any, the endianness. The Unicode/ISO 10646 says that
unless some higher protocol specifies it differently, the byte
order is big endian.*/
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP internal_ucs4_loop
#define TO_LOOP internal_ucs4_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_internal_ucs4
#define ONE_DIRECTION 0
static inline int
__attribute ((always_inline))
internal_ucs4_loop (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp, const unsigned char *inend,
unsigned char **outptrp, const unsigned char *outend,
size_t *irreversible)
{
const unsigned char *inptr = *inptrp;
unsigned char *outptr = *outptrp;
size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
int result;
#if __BYTE_ORDER == __LITTLE_ENDIAN
/* Sigh, we have to do some real work. */
size_t cnt;
for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4, outptr += 4)
{
uint32_t val = get32 (inptr);
put32 (outptr, __builtin_bswap32 (val));
}
*inptrp = inptr;
*outptrp = outptr;
#elif __BYTE_ORDER == __BIG_ENDIAN
/* Simply copy the data. */
*inptrp = inptr + n_convert * 4;
*outptrp = __mempcpy (outptr, inptr, n_convert * 4);
#else
# error "This endianness is not supported."
#endif
/* Determine the status. */
if (*inptrp == inend)
result = __GCONV_EMPTY_INPUT;
else if (*outptrp + 4 > outend)
result = __GCONV_FULL_OUTPUT;
else
result = __GCONV_INCOMPLETE_INPUT;
return result;
}
static inline int
__attribute ((always_inline))
internal_ucs4_loop_single (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp,
const unsigned char *inend,
unsigned char **outptrp,
const unsigned char *outend,
size_t *irreversible)
{
mbstate_t *state = step_data->__statep;
size_t cnt = state->__count & 7;
while (*inptrp < inend && cnt < 4)
state->__value.__wchb[cnt++] = *(*inptrp)++;
if (__glibc_unlikely (cnt < 4))
{
/* Still not enough bytes. Store the ones in the input buffer. */
state->__count &= ~7;
state->__count |= cnt;
return __GCONV_INCOMPLETE_INPUT;
}
#if __BYTE_ORDER == __LITTLE_ENDIAN
(*outptrp)[0] = state->__value.__wchb[3];
(*outptrp)[1] = state->__value.__wchb[2];
(*outptrp)[2] = state->__value.__wchb[1];
(*outptrp)[3] = state->__value.__wchb[0];
#elif __BYTE_ORDER == __BIG_ENDIAN
/* XXX unaligned */
(*outptrp)[0] = state->__value.__wchb[0];
(*outptrp)[1] = state->__value.__wchb[1];
(*outptrp)[2] = state->__value.__wchb[2];
(*outptrp)[3] = state->__value.__wchb[3];
#else
# error "This endianness is not supported."
#endif
*outptrp += 4;
/* Clear the state buffer. */
state->__count &= ~7;
return __GCONV_OK;
}
#include <iconv/skeleton.c>
/* Transform from UCS4 to the internal, UCS4-like format. Unlike
for the other direction we have to check for correct values here. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP ucs4_internal_loop
#define TO_LOOP ucs4_internal_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_ucs4_internal
#define ONE_DIRECTION 0
static inline int
__attribute ((always_inline))
ucs4_internal_loop (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp, const unsigned char *inend,
unsigned char **outptrp, const unsigned char *outend,
size_t *irreversible)
{
int flags = step_data->__flags;
const unsigned char *inptr = *inptrp;
unsigned char *outptr = *outptrp;
int result;
for (; inptr + 4 <= inend && outptr + 4 <= outend; inptr += 4)
{
uint32_t inval = get32 (inptr);
#if __BYTE_ORDER == __LITTLE_ENDIAN
inval = __builtin_bswap32 (inval);
#endif
if (__glibc_unlikely (inval > 0x7fffffff))
{
/* The value is too large. We don't try transliteration here since
this is not an error because of the lack of possibilities to
represent the result. This is a genuine bug in the input since
UCS4 does not allow such values. */
if (irreversible == NULL)
/* We are transliterating, don't try to correct anything. */
return __gconv_mark_illegal_input (step_data);
if (flags & __GCONV_IGNORE_ERRORS)
{
/* Just ignore this character. */
++*irreversible;
continue;
}
*inptrp = inptr;
*outptrp = outptr;
return __gconv_mark_illegal_input (step_data);
}
put32 (outptr, inval);
outptr += sizeof (uint32_t);
}
*inptrp = inptr;
*outptrp = outptr;
/* Determine the status. */
if (*inptrp == inend)
result = __GCONV_EMPTY_INPUT;
else if (*outptrp + 4 > outend)
result = __GCONV_FULL_OUTPUT;
else
result = __GCONV_INCOMPLETE_INPUT;
return result;
}
static inline int
__attribute ((always_inline))
ucs4_internal_loop_single (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp,
const unsigned char *inend,
unsigned char **outptrp,
const unsigned char *outend,
size_t *irreversible)
{
mbstate_t *state = step_data->__statep;
int flags = step_data->__flags;
size_t cnt = state->__count & 7;
while (*inptrp < inend && cnt < 4)
state->__value.__wchb[cnt++] = *(*inptrp)++;
if (__glibc_unlikely (cnt < 4))
{
/* Still not enough bytes. Store the ones in the input buffer. */
state->__count &= ~7;
state->__count |= cnt;
return __GCONV_INCOMPLETE_INPUT;
}
if (__builtin_expect (((unsigned char *) state->__value.__wchb)[0] > 0x80,
0))
{
/* The value is too large. We don't try transliteration here since
this is not an error because of the lack of possibilities to
represent the result. This is a genuine bug in the input since
UCS4 does not allow such values. */
if (!(flags & __GCONV_IGNORE_ERRORS))
{
*inptrp -= cnt - (state->__count & 7);
return __gconv_mark_illegal_input (step_data);
}
}
else
{
#if __BYTE_ORDER == __LITTLE_ENDIAN
(*outptrp)[0] = state->__value.__wchb[3];
(*outptrp)[1] = state->__value.__wchb[2];
(*outptrp)[2] = state->__value.__wchb[1];
(*outptrp)[3] = state->__value.__wchb[0];
#elif __BYTE_ORDER == __BIG_ENDIAN
(*outptrp)[0] = state->__value.__wchb[0];
(*outptrp)[1] = state->__value.__wchb[1];
(*outptrp)[2] = state->__value.__wchb[2];
(*outptrp)[3] = state->__value.__wchb[3];
#endif
*outptrp += 4;
}
/* Clear the state buffer. */
state->__count &= ~7;
return __GCONV_OK;
}
#include <iconv/skeleton.c>
/* Similarly for the little endian form. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP internal_ucs4le_loop
#define TO_LOOP internal_ucs4le_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_internal_ucs4le
#define ONE_DIRECTION 0
static inline int
__attribute ((always_inline))
internal_ucs4le_loop (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp, const unsigned char *inend,
unsigned char **outptrp, const unsigned char *outend,
size_t *irreversible)
{
const unsigned char *inptr = *inptrp;
unsigned char *outptr = *outptrp;
size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
int result;
#if __BYTE_ORDER == __BIG_ENDIAN
/* Sigh, we have to do some real work. */
size_t cnt;
for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4, outptr += 4)
{
uint32_t val = get32 (inptr);
put32 (outptr, __builtin_bswap32 (val));
}
*inptrp = inptr;
*outptrp = outptr;
#elif __BYTE_ORDER == __LITTLE_ENDIAN
/* Simply copy the data. */
*inptrp = inptr + n_convert * 4;
*outptrp = __mempcpy (outptr, inptr, n_convert * 4);
#else
# error "This endianness is not supported."
#endif
/* Determine the status. */
if (*inptrp == inend)
result = __GCONV_EMPTY_INPUT;
else if (*outptrp + 4 > outend)
result = __GCONV_FULL_OUTPUT;
else
result = __GCONV_INCOMPLETE_INPUT;
return result;
}
static inline int
__attribute ((always_inline))
internal_ucs4le_loop_single (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp,
const unsigned char *inend,
unsigned char **outptrp,
const unsigned char *outend,
size_t *irreversible)
{
mbstate_t *state = step_data->__statep;
size_t cnt = state->__count & 7;
while (*inptrp < inend && cnt < 4)
state->__value.__wchb[cnt++] = *(*inptrp)++;
if (__glibc_unlikely (cnt < 4))
{
/* Still not enough bytes. Store the ones in the input buffer. */
state->__count &= ~7;
state->__count |= cnt;
return __GCONV_INCOMPLETE_INPUT;
}
#if __BYTE_ORDER == __BIG_ENDIAN
(*outptrp)[0] = state->__value.__wchb[3];
(*outptrp)[1] = state->__value.__wchb[2];
(*outptrp)[2] = state->__value.__wchb[1];
(*outptrp)[3] = state->__value.__wchb[0];
#else
/* XXX unaligned */
(*outptrp)[0] = state->__value.__wchb[0];
(*outptrp)[1] = state->__value.__wchb[1];
(*outptrp)[2] = state->__value.__wchb[2];
(*outptrp)[3] = state->__value.__wchb[3];
#endif
*outptrp += 4;
/* Clear the state buffer. */
state->__count &= ~7;
return __GCONV_OK;
}
#include <iconv/skeleton.c>
/* And finally from UCS4-LE to the internal encoding. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP ucs4le_internal_loop
#define TO_LOOP ucs4le_internal_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_ucs4le_internal
#define ONE_DIRECTION 0
static inline int
__attribute ((always_inline))
ucs4le_internal_loop (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp, const unsigned char *inend,
unsigned char **outptrp, const unsigned char *outend,
size_t *irreversible)
{
int flags = step_data->__flags;
const unsigned char *inptr = *inptrp;
unsigned char *outptr = *outptrp;
int result;
for (; inptr + 4 <= inend && outptr + 4 <= outend; inptr += 4)
{
uint32_t inval = get32 (inptr);
#if __BYTE_ORDER == __BIG_ENDIAN
inval = __builtin_bswap32 (inval);
#endif
if (__glibc_unlikely (inval > 0x7fffffff))
{
/* The value is too large. We don't try transliteration here since
this is not an error because of the lack of possibilities to
represent the result. This is a genuine bug in the input since
UCS4 does not allow such values. */
if (irreversible == NULL)
/* We are transliterating, don't try to correct anything. */
return __gconv_mark_illegal_input (step_data);
if (flags & __GCONV_IGNORE_ERRORS)
{
/* Just ignore this character. */
++*irreversible;
continue;
}
*inptrp = inptr;
*outptrp = outptr;
return __gconv_mark_illegal_input (step_data);
}
put32 (outptr, inval);
outptr += sizeof (uint32_t);
}
*inptrp = inptr;
*outptrp = outptr;
/* Determine the status. */
if (*inptrp == inend)
result = __GCONV_EMPTY_INPUT;
else if (*inptrp + 4 > inend)
result = __GCONV_INCOMPLETE_INPUT;
else
{
assert (*outptrp + 4 > outend);
result = __GCONV_FULL_OUTPUT;
}
return result;
}
static inline int
__attribute ((always_inline))
ucs4le_internal_loop_single (struct __gconv_step *step,
struct __gconv_step_data *step_data,
const unsigned char **inptrp,
const unsigned char *inend,
unsigned char **outptrp,
const unsigned char *outend,
size_t *irreversible)
{
mbstate_t *state = step_data->__statep;
int flags = step_data->__flags;
size_t cnt = state->__count & 7;
while (*inptrp < inend && cnt < 4)
state->__value.__wchb[cnt++] = *(*inptrp)++;
if (__glibc_unlikely (cnt < 4))
{
/* Still not enough bytes. Store the ones in the input buffer. */
state->__count &= ~7;
state->__count |= cnt;
return __GCONV_INCOMPLETE_INPUT;
}
if (__builtin_expect (((unsigned char *) state->__value.__wchb)[3] > 0x80,
0))
{
/* The value is too large. We don't try transliteration here since
this is not an error because of the lack of possibilities to
represent the result. This is a genuine bug in the input since
UCS4 does not allow such values. */
if (!(flags & __GCONV_IGNORE_ERRORS))
return __gconv_mark_illegal_input (step_data);
}
else
{
#if __BYTE_ORDER == __BIG_ENDIAN
(*outptrp)[0] = state->__value.__wchb[3];
(*outptrp)[1] = state->__value.__wchb[2];
(*outptrp)[2] = state->__value.__wchb[1];
(*outptrp)[3] = state->__value.__wchb[0];
#else
(*outptrp)[0] = state->__value.__wchb[0];
(*outptrp)[1] = state->__value.__wchb[1];
(*outptrp)[2] = state->__value.__wchb[2];
(*outptrp)[3] = state->__value.__wchb[3];
#endif
*outptrp += 4;
}
/* Clear the state buffer. */
state->__count &= ~7;
return __GCONV_OK;
}
#include <iconv/skeleton.c>
/* Convert from ISO 646-IRV to the internal (UCS4-like) format. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 1
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP ascii_internal_loop
#define TO_LOOP ascii_internal_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_ascii_internal
#define ONE_DIRECTION 1
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
if (__glibc_unlikely (*inptr > '\x7f')) \
{ \
/* The value is too large. We don't try transliteration here since \
this is not an error because of the lack of possibilities to \
represent the result. This is a genuine bug in the input since \
ASCII does not allow such values. */ \
STANDARD_FROM_LOOP_ERR_HANDLER (1); \
} \
else \
{ \
/* It's an one byte sequence. */ \
*((uint32_t *) outptr) = *inptr++; \
outptr += sizeof (uint32_t); \
} \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from the internal (UCS4-like) format to ISO 646-IRV. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 1
#define FROM_DIRECTION 1
#define FROM_LOOP internal_ascii_loop
#define TO_LOOP internal_ascii_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_internal_ascii
#define ONE_DIRECTION 1
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
if (__glibc_unlikely (*((const uint32_t *) inptr) > 0x7f)) \
{ \
UNICODE_TAG_HANDLER (*((const uint32_t *) inptr), 4); \
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
else \
{ \
/* It's an one byte sequence. */ \
*outptr++ = *((const uint32_t *) inptr); \
inptr += sizeof (uint32_t); \
} \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from the internal (UCS4-like) format to UTF-8. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 1
#define MAX_NEEDED_TO 6
#define FROM_DIRECTION 1
#define FROM_LOOP internal_utf8_loop
#define TO_LOOP internal_utf8_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_internal_utf8
#define ONE_DIRECTION 1
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT MAX_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
uint32_t wc = *((const uint32_t *) inptr); \
\
if (__glibc_likely (wc < 0x80)) \
/* It's an one byte sequence. */ \
*outptr++ = (unsigned char) wc; \
else if (__glibc_likely (wc <= 0x7fffffff \
&& (wc < 0xd800 || wc > 0xdfff))) \
{ \
size_t step; \
unsigned char *start; \
\
for (step = 2; step < 6; ++step) \
if ((wc & (~(uint32_t)0 << (5 * step + 1))) == 0) \
break; \
\
if (__glibc_unlikely (outptr + step > outend)) \
{ \
/* Too long. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
start = outptr; \
*outptr = (unsigned char) (~0xff >> step); \
outptr += step; \
do \
{ \
start[--step] = 0x80 | (wc & 0x3f); \
wc >>= 6; \
} \
while (step > 1); \
start[0] |= wc; \
} \
else \
{ \
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
\
inptr += 4; \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from UTF-8 to the internal (UCS4-like) format. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 1
#define MAX_NEEDED_FROM 6
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP utf8_internal_loop
#define TO_LOOP utf8_internal_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_utf8_internal
#define ONE_DIRECTION 1
#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 \
{ \
/* Next input byte. */ \
uint32_t ch = *inptr; \
\
if (__glibc_likely (ch < 0x80)) \
{ \
/* One byte sequence. */ \
++inptr; \
} \
else \
{ \
unsigned int cnt; \
unsigned int i; \
\
if (ch >= 0xc2 && ch < 0xe0) \
{ \
/* We expect two bytes. The first byte cannot be 0xc0 or 0xc1, \
otherwise the wide character could have been represented \
using a single byte. */ \
cnt = 2; \
ch &= 0x1f; \
} \
else if (__glibc_likely ((ch & 0xf0) == 0xe0)) \
{ \
/* We expect three bytes. */ \
cnt = 3; \
ch &= 0x0f; \
} \
else if (__glibc_likely ((ch & 0xf8) == 0xf0)) \
{ \
/* We expect four bytes. */ \
cnt = 4; \
ch &= 0x07; \
} \
else if (__glibc_likely ((ch & 0xfc) == 0xf8)) \
{ \
/* We expect five bytes. */ \
cnt = 5; \
ch &= 0x03; \
} \
else if (__glibc_likely ((ch & 0xfe) == 0xfc)) \
{ \
/* We expect six bytes. */ \
cnt = 6; \
ch &= 0x01; \
} \
else \
{ \
/* Search the end of this ill-formed UTF-8 character. This \
is the next byte with (x & 0xc0) != 0x80. */ \
i = 0; \
do \
++i; \
while (inptr + i < inend \
&& (*(inptr + i) & 0xc0) == 0x80 \
&& i < 5); \
\
errout: \
STANDARD_FROM_LOOP_ERR_HANDLER (i); \
} \
\
if (__glibc_unlikely (inptr + cnt > inend)) \
{ \
/* We don't have enough input. But before we report that check \
that all the bytes are correct. */ \
for (i = 1; inptr + i < inend; ++i) \
if ((inptr[i] & 0xc0) != 0x80) \
break; \
\
if (__glibc_likely (inptr + i == inend)) \
{ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
goto errout; \
} \
\
/* Read the possible remaining bytes. */ \
for (i = 1; i < cnt; ++i) \
{ \
uint32_t byte = inptr[i]; \
\
if ((byte & 0xc0) != 0x80) \
/* This is an illegal encoding. */ \
break; \
\
ch <<= 6; \
ch |= byte & 0x3f; \
} \
\
/* If i < cnt, some trail byte was not >= 0x80, < 0xc0. \
If cnt > 2 and ch < 2^(5*cnt-4), the wide character ch could \
have been represented with fewer than cnt bytes. */ \
if (i < cnt || (cnt > 2 && (ch >> (5 * cnt - 4)) == 0) \
/* Do not accept UTF-16 surrogates. */ \
|| (ch >= 0xd800 && ch <= 0xdfff)) \
{ \
/* This is an illegal encoding. */ \
goto errout; \
} \
\
inptr += cnt; \
} \
\
/* Now adjust the pointers and store the result. */ \
*((uint32_t *) outptr) = ch; \
outptr += sizeof (uint32_t); \
}
#define LOOP_NEED_FLAGS
#define STORE_REST \
{ \
/* We store the remaining bytes while converting them into the UCS4 \
format. We can assume that the first byte in the buffer is \
correct and that it requires a larger number of bytes than there \
are in the input buffer. */ \
wint_t ch = **inptrp; \
size_t cnt, r; \
\
state->__count = inend - *inptrp; \
\
assert (ch != 0xc0 && ch != 0xc1); \
if (ch >= 0xc2 && ch < 0xe0) \
{ \
/* We expect two bytes. The first byte cannot be 0xc0 or \
0xc1, otherwise the wide character could have been \
represented using a single byte. */ \
cnt = 2; \
ch &= 0x1f; \
} \
else if (__glibc_likely ((ch & 0xf0) == 0xe0)) \
{ \
/* We expect three bytes. */ \
cnt = 3; \
ch &= 0x0f; \
} \
else if (__glibc_likely ((ch & 0xf8) == 0xf0)) \
{ \
/* We expect four bytes. */ \
cnt = 4; \
ch &= 0x07; \
} \
else if (__glibc_likely ((ch & 0xfc) == 0xf8)) \
{ \
/* We expect five bytes. */ \
cnt = 5; \
ch &= 0x03; \
} \
else \
{ \
/* We expect six bytes. */ \
cnt = 6; \
ch &= 0x01; \
} \
\
/* The first byte is already consumed. */ \
r = cnt - 1; \
while (++(*inptrp) < inend) \
{ \
ch <<= 6; \
ch |= **inptrp & 0x3f; \
--r; \
} \
\
/* Shift for the so far missing bytes. */ \
ch <<= r * 6; \
\
/* Store the number of bytes expected for the entire sequence. */ \
state->__count |= cnt << 8; \
\
/* Store the value. */ \
state->__value.__wch = ch; \
}
#define UNPACK_BYTES \
{ \
static const unsigned char inmask[5] = { 0xc0, 0xe0, 0xf0, 0xf8, 0xfc }; \
wint_t wch = state->__value.__wch; \
size_t ntotal = state->__count >> 8; \
\
inlen = state->__count & 255; \
\
bytebuf[0] = inmask[ntotal - 2]; \
\
do \
{ \
if (--ntotal < inlen) \
bytebuf[ntotal] = 0x80 | (wch & 0x3f); \
wch >>= 6; \
} \
while (ntotal > 1); \
\
bytebuf[0] |= wch; \
}
#define CLEAR_STATE \
state->__count = 0
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from UCS2 to the internal (UCS4-like) format. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 2
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP ucs2_internal_loop
#define TO_LOOP ucs2_internal_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_ucs2_internal
#define ONE_DIRECTION 1
#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 (__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); \
} \
\
*((uint32_t *) outptr) = u1; \
outptr += sizeof (uint32_t); \
inptr += 2; \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from the internal (UCS4-like) format to UCS2. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 2
#define FROM_DIRECTION 1
#define FROM_LOOP internal_ucs2_loop
#define TO_LOOP internal_ucs2_loop /* This is not used. */
#define FUNCTION_NAME __gconv_transform_internal_ucs2
#define ONE_DIRECTION 1
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
uint32_t val = *((const uint32_t *) inptr); \
\
if (__glibc_unlikely (val >= 0x10000)) \
{ \
UNICODE_TAG_HANDLER (val, 4); \
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
else if (__glibc_unlikely (val >= 0xd800 && val < 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, val); \
outptr += sizeof (uint16_t); \
inptr += 4; \
} \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from UCS2 in other endianness to the internal (UCS4-like) format. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 2
#define MIN_NEEDED_TO 4
#define FROM_DIRECTION 1
#define FROM_LOOP ucs2reverse_internal_loop
#define TO_LOOP ucs2reverse_internal_loop/* This is not used.*/
#define FUNCTION_NAME __gconv_transform_ucs2reverse_internal
#define ONE_DIRECTION 1
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
uint16_t u1 = bswap_16 (get16 (inptr)); \
\
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.) */ \
if (! ignore_errors_p ()) \
{ \
result = __gconv_mark_illegal_input (step_data); \
break; \
} \
inptr += 2; \
++*irreversible; \
continue; \
} \
\
*((uint32_t *) outptr) = u1; \
outptr += sizeof (uint32_t); \
inptr += 2; \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
#include <iconv/skeleton.c>
/* Convert from the internal (UCS4-like) format to UCS2 in other endianness. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
#define MIN_NEEDED_FROM 4
#define MIN_NEEDED_TO 2
#define FROM_DIRECTION 1
#define FROM_LOOP internal_ucs2reverse_loop
#define TO_LOOP internal_ucs2reverse_loop/* This is not used.*/
#define FUNCTION_NAME __gconv_transform_internal_ucs2reverse
#define ONE_DIRECTION 1
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
uint32_t val = *((const uint32_t *) inptr); \
if (__glibc_unlikely (val >= 0x10000)) \
{ \
UNICODE_TAG_HANDLER (val, 4); \
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
else if (__glibc_unlikely (val >= 0xd800 && val < 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. */ \
if (! ignore_errors_p ()) \
{ \
result = __gconv_mark_illegal_input (step_data); \
break; \
} \
inptr += 4; \
++*irreversible; \
continue; \
} \
else \
{ \
put16 (outptr, bswap_16 (val)); \
outptr += sizeof (uint16_t); \
inptr += 4; \
} \
}
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>
#include <iconv/skeleton.c>
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