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glibc/iconv/skeleton.c

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/* Skeleton for a conversion module.
Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* This file can be included to provide definitions of several things
many modules have in common. It can be customized using the following
macros:
DEFINE_INIT define the default initializer. This requires the
following symbol to be defined.
CHARSET_NAME string with official name of the coded character
set (in all-caps)
DEFINE_FINI define the default destructor function.
MIN_NEEDED_FROM minimal number of bytes needed for the from-charset.
MIN_NEEDED_TO likewise for the to-charset.
MAX_NEEDED_FROM maximal number of bytes needed for the from-charset.
This macro is optional, it defaults to MIN_NEEDED_FROM.
MAX_NEEDED_TO likewise for the to-charset.
DEFINE_DIRECTION_OBJECTS
two objects will be defined to be used when the
`gconv' function must only distinguish two
directions. This is implied by DEFINE_INIT.
If this macro is not defined the following
macro must be available.
FROM_DIRECTION this macro is supposed to return a value != 0
if we convert from the current character set,
otherwise it return 0.
EMIT_SHIFT_TO_INIT this symbol is optional. If it is defined it
defines some code which writes out a sequence
of characters which bring the current state into
the initial state.
FROM_LOOP name of the function implementing the conversion
from the current characters.
TO_LOOP likewise for the other direction
RESET_STATE in case of an error we must reset the state for
the rerun so this macro must be defined for
stateful encodings. It takes an argument which
is nonzero when saving.
RESET_INPUT_BUFFER If the input character sets allow this the macro
can be defined to reset the input buffer pointers
to cover only those characters up to the error.
FUNCTION_NAME if not set the conversion function is named `gconv'.
PREPARE_LOOP optional code preparing the conversion loop. Can
contain variable definitions.
END_LOOP also optional, may be used to store information
EXTRA_LOOP_ARGS optional macro specifying extra arguments passed
to loop function.
*/
#include <assert.h>
#include <gconv.h>
#include <string.h>
#define __need_size_t
#define __need_NULL
#include <stddef.h>
#ifndef STATIC_GCONV
# include <dlfcn.h>
#endif
#ifndef DL_CALL_FCT
# define DL_CALL_FCT(fct, args) fct args
#endif
/* The direction objects. */
#if DEFINE_DIRECTION_OBJECTS || DEFINE_INIT
static int from_object;
static int to_object;
# ifndef FROM_DIRECTION
# define FROM_DIRECTION (step->__data == &from_object)
# endif
#else
# ifndef FROM_DIRECTION
# error "FROM_DIRECTION must be provided if direction objects are not used"
# endif
#endif
/* How many bytes are needed at most for the from-charset. */
#ifndef MAX_NEEDED_FROM
# define MAX_NEEDED_FROM MIN_NEEDED_FROM
#endif
/* Same for the to-charset. */
#ifndef MAX_NEEDED_TO
# define MAX_NEEDED_TO MIN_NEEDED_TO
#endif
/* Define macros which can access unaligned buffers. These macros are
supposed to be used only in code outside the inner loops. For the inner
loops we have other definitions which allow optimized access. */
#ifdef _STRING_ARCH_unaligned
/* We can handle unaligned memory access. */
# define get16u(addr) *((uint16_t *) (addr))
# define get32u(addr) *((uint32_t *) (addr))
/* We need no special support for writing values either. */
# define put16u(addr, val) *((uint16_t *) (addr)) = (val)
# define put32u(addr, val) *((uint32_t *) (addr)) = (val)
#else
/* Distinguish between big endian and little endian. */
# if __BYTE_ORDER == __LITTLE_ENDIAN
# define get16u(addr) \
(((__const unsigned char *) (addr))[1] << 8 \
| ((__const unsigned char *) (addr))[0])
# define get32u(addr) \
(((((__const unsigned char *) (addr))[3] << 8 \
| ((__const unsigned char *) (addr))[2]) << 8 \
| ((__const unsigned char *) (addr))[1]) << 8 \
| ((__const unsigned char *) (addr))[0])
# define put16u(addr, val) \
({ uint16_t __val = (val); \
((unsigned char *) (addr))[0] = __val; \
((unsigned char *) (addr))[1] = __val >> 8; \
(void) 0; })
# define put32u(addr, val) \
({ uint32_t __val = (val); \
((unsigned char *) (addr))[0] = __val; \
__val >>= 8; \
((unsigned char *) (addr))[1] = __val; \
__val >>= 8; \
((unsigned char *) (addr))[2] = __val; \
__val >>= 8; \
((unsigned char *) (addr))[3] = __val; \
(void) 0; })
# else
# define get16u(addr) \
(((__const unsigned char *) (addr))[0] << 8 \
| ((__const unsigned char *) (addr))[1])
# define get32u(addr) \
(((((__const unsigned char *) (addr))[0] << 8 \
| ((__const unsigned char *) (addr))[1]) << 8 \
| ((__const unsigned char *) (addr))[2]) << 8 \
| ((__const unsigned char *) (addr))[3])
# define put16u(addr, val) \
({ uint16_t __val = (val); \
((unsigned char *) (addr))[1] = __val; \
((unsigned char *) (addr))[0] = __val >> 8; \
(void) 0; })
# define put32u(addr, val) \
({ uint32_t __val = (val); \
((unsigned char *) (addr))[3] = __val; \
__val >>= 8; \
((unsigned char *) (addr))[2] = __val; \
__val >>= 8; \
((unsigned char *) (addr))[1] = __val; \
__val >>= 8; \
((unsigned char *) (addr))[0] = __val; \
(void) 0; })
# endif
#endif
/* For conversions from a fixed width character sets to another fixed width
character set we we can define RESET_INPUT_BUFFER is necessary. */
#if !defined RESET_INPUT_BUFFER && !defined SAVE_RESET_STATE
# if MIN_NEEDED_FROM == MAX_NEEDED_FROM && MIN_NEEDED_TO == MAX_NEEDED_TO
/* We have to use these `if's here since the compiler cannot know that
(outbuf - outerr) is always divisible by MIN_NEEDED_TO. */
# define RESET_INPUT_BUFFER \
if (MIN_NEEDED_FROM % MIN_NEEDED_TO == 0) \
*inptrp -= (outbuf - outerr) * (MIN_NEEDED_FROM / MIN_NEEDED_TO); \
else if (MIN_NEEDED_TO % MIN_NEEDED_FROM == 0) \
*inptrp -= (outbuf - outerr) / (MIN_NEEDED_TO / MIN_NEEDED_FROM); \
else \
*inptrp -= ((outbuf - outerr) / MIN_NEEDED_TO) * MIN_NEEDED_FROM
# endif
#endif
/* The default init function. It simply matches the name and initializes
the step data to point to one of the objects above. */
#if DEFINE_INIT
# ifndef CHARSET_NAME
# error "CHARSET_NAME not defined"
# endif
int
gconv_init (struct __gconv_step *step)
{
/* Determine which direction. */
if (strcmp (step->__from_name, CHARSET_NAME) == 0)
{
step->__data = &from_object;
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 = MAX_NEEDED_TO;
}
else if (__builtin_expect (strcmp (step->__to_name, CHARSET_NAME), 0) == 0)
{
step->__data = &to_object;
step->__min_needed_from = MIN_NEEDED_TO;
step->__max_needed_from = MAX_NEEDED_TO;
step->__min_needed_to = MIN_NEEDED_FROM;
step->__max_needed_to = MAX_NEEDED_FROM;
}
else
return __GCONV_NOCONV;
#ifdef RESET_STATE
step->__stateful = 1;
#else
step->__stateful = 0;
#endif
return __GCONV_OK;
}
#endif
/* The default destructor function does nothing in the moment and so
be define it at all. But we still provide the macro just in case
we need it some day. */
#if DEFINE_FINI
#endif
/* If no arguments have to passed to the loop function define the macro
as empty. */
#ifndef EXTRA_LOOP_ARGS
# define EXTRA_LOOP_ARGS
#endif
/* This is the actual conversion function. */
#ifndef FUNCTION_NAME
# define FUNCTION_NAME gconv
#endif
/* The macros are used to access the function to convert single characters. */
#define SINGLE(fct) SINGLE2 (fct)
#define SINGLE2(fct) fct##_single
int
FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
const unsigned char **inptrp, const unsigned char *inend,
unsigned char **outbufstart, size_t *irreversible, int do_flush,
int consume_incomplete)
{
struct __gconv_step *next_step = step + 1;
struct __gconv_step_data *next_data = data + 1;
__gconv_fct fct;
int status;
fct = (data->__flags & __GCONV_IS_LAST) ? NULL : next_step->__fct;
/* If the function is called with no input this means we have to reset
to the initial state. The possibly partly converted input is
dropped. */
if (__builtin_expect (do_flush, 0))
{
status = __GCONV_OK;
/* This should never happen during error handling. */
assert (outbufstart == NULL);
#ifdef EMIT_SHIFT_TO_INIT
/* Emit the escape sequence to reset the state. */
EMIT_SHIFT_TO_INIT;
#else
/* Clear the state object. There might be bytes in there from
previous calls with CONSUME_INCOMPLETE == 1. */
memset (data->__statep, '\0', sizeof (*data->__statep));
#endif
/* Call the steps down the chain if there are any but only if we
successfully emitted the escape sequence. This should only
fail if the output buffer is full. If the input is invalid
it should be discarded since the user wants to start from a
clean slate. */
if (status == __GCONV_OK && ! (data->__flags & __GCONV_IS_LAST))
status = DL_CALL_FCT (fct, (next_step, next_data, NULL, NULL,
NULL, irreversible, 1,
consume_incomplete));
}
else
{
/* We preserve the initial values of the pointer variables. */
const unsigned char *inptr = *inptrp;
unsigned char *outbuf = (__builtin_expect (outbufstart == NULL, 1)
? data->__outbuf : *outbufstart);
unsigned char *outend = data->__outbufend;
unsigned char *outstart;
/* This variable is used to count the number of characters we
actually converted. */
size_t lirreversible = 0;
#if defined _STRING_ARCH_unaligned \
|| MIN_NEEDED_FROM == 1 || MAX_NEEDED_FROM % MIN_NEEDED_FROM != 0 \
|| MIN_NEEDED_TO == 1 || MAX_NEEDED_TO % MIN_NEEDED_TO != 0
# define unaligned 0
#else
int unaligned;
# define GEN_unaligned(name) GEN_unaligned2 (name)
# define GEN_unaligned2(name) name##_unaligned
#endif
#ifdef PREPARE_LOOP
PREPARE_LOOP
#endif
#if MAX_NEEDED_FROM > 1 || MAX_NEEDED_TO > 1
/* If the function is used to implement the mb*towc*() or wc*tomb*()
functions we must test whether any bytes from the last call are
stored in the `state' object. */
if (((MAX_NEEDED_FROM > 1 && FROM_DIRECTION)
|| (MAX_NEEDED_TO > 1 && !FROM_DIRECTION))
&& consume_incomplete && (data->__statep->__count & 7) != 0)
{
/* Yep, we have some bytes left over. Process them now.
But this must not happen while we are called from an
error handler. */
assert (outbufstart == NULL);
# if MAX_NEEDED_FROM > 1
if (MAX_NEEDED_TO == 1 || FROM_DIRECTION)
status = SINGLE(FROM_LOOP) (step, data, inptrp, inend, &outbuf,
outend, &lirreversible
EXTRA_LOOP_ARGS);
# endif
# if MAX_NEEDED_FROM > 1 && MAX_NEEDED_TO > 1 && !ONE_DIRECTION
else
# endif
# if MAX_NEEDED_TO > 1 && !ONE_DIRECTION
status = SINGLE(TO_LOOP) (step, data, inptrp, inend, &outbuf,
outend, &lirreversible EXTRA_LOOP_ARGS);
# endif
if (__builtin_expect (status, __GCONV_OK) != __GCONV_OK)
return status;
}
#endif
#if !defined _STRING_ARCH_unaligned \
&& MIN_NEEDED_FROM != 1 && MAX_NEEDED_FROM % MIN_NEEDED_FROM == 0 \
&& MIN_NEEDED_TO != 1 && MAX_NEEDED_TO % MIN_NEEDED_TO == 0
/* The following assumes that encodings, which have a variable length
what might unalign a buffer even though it is a aligned in the
beginning, either don't have the minimal number of bytes as a divisor
of the maximum length or have a minimum length of 1. This is true
for all known and supported encodings. */
unaligned = ((FROM_DIRECTION
&& ((uintptr_t) inptr % MIN_NEEDED_FROM != 0
|| ((data->__flags & __GCONV_IS_LAST)
&& (uintptr_t) outbuf % MIN_NEEDED_TO != 0)))
|| (!FROM_DIRECTION
&& (((data->__flags & __GCONV_IS_LAST)
&& (uintptr_t) outbuf % MIN_NEEDED_FROM != 0)
|| (uintptr_t) inptr % MIN_NEEDED_TO != 0)));
#endif
do
{
struct __gconv_trans_data *trans;
/* Remember the start value for this round. */
inptr = *inptrp;
/* The outbuf buffer is empty. */
outstart = outbuf;
#ifdef SAVE_RESET_STATE
SAVE_RESET_STATE (1);
#endif
if (__builtin_expect (!unaligned, 1))
{
if (FROM_DIRECTION)
/* Run the conversion loop. */
status = FROM_LOOP (step, data, inptrp, inend, &outbuf, outend,
&lirreversible EXTRA_LOOP_ARGS);
else
/* Run the conversion loop. */
status = TO_LOOP (step, data, inptrp, inend, &outbuf, outend,
&lirreversible EXTRA_LOOP_ARGS);
}
#if !defined _STRING_ARCH_unaligned \
&& MIN_NEEDED_FROM != 1 && MAX_NEEDED_FROM % MIN_NEEDED_FROM == 0 \
&& MIN_NEEDED_TO != 1 && MAX_NEEDED_TO % MIN_NEEDED_TO == 0
else
{
if (FROM_DIRECTION)
/* Run the conversion loop. */
status = GEN_unaligned (FROM_LOOP) (step, data, inptrp, inend,
&outbuf, outend,
&lirreversible
EXTRA_LOOP_ARGS);
else
/* Run the conversion loop. */
status = GEN_unaligned (TO_LOOP) (step, data, inptrp, inend,
&outbuf, outend,
&lirreversible
EXTRA_LOOP_ARGS);
}
#endif
/* If we were called as part of an error handling module we
don't do anything else here. */
if (__builtin_expect (outbufstart != NULL, 0))
{
*outbufstart = outbuf;
return status;
}
/* Give the transliteration module the chance to store the
original text and the result in case it needs a context. */
for (trans = data->__trans; trans != NULL; trans = trans->__next)
if (trans->__trans_context_fct != NULL)
DL_CALL_FCT (trans->__trans_context_fct,
(trans->__data, inptr, *inptrp, outstart, outbuf));
/* We finished one use of the loops. */
++data->__invocation_counter;
/* If this is the last step leave the loop, there is nothing
we can do. */
if (__builtin_expect (data->__flags & __GCONV_IS_LAST, 0))
{
/* Store information about how many bytes are available. */
data->__outbuf = outbuf;
/* Remember how many non-identical characters we
converted in a irreversible way. */
*irreversible += lirreversible;
break;
}
/* Write out all output which was produced. */
if (__builtin_expect (outbuf > outstart, 1))
{
const unsigned char *outerr = data->__outbuf;
int result;
result = DL_CALL_FCT (fct, (next_step, next_data, &outerr,
outbuf, NULL, irreversible, 0,
consume_incomplete));
if (result != __GCONV_EMPTY_INPUT)
{
if (__builtin_expect (outerr != outbuf, 0))
{
#ifdef RESET_INPUT_BUFFER
RESET_INPUT_BUFFER;
#else
/* We have a problem with the in on of the functions
below. Undo the conversion upto the error point. */
size_t nstatus;
/* Reload the pointers. */
*inptrp = inptr;
outbuf = outstart;
/* Reset the state. */
# ifdef SAVE_RESET_STATE
SAVE_RESET_STATE (0);
# endif
/* XXX Handle unaligned access here as well. */
if (FROM_DIRECTION)
/* Run the conversion loop. */
nstatus = FROM_LOOP (step, data,
(const unsigned char **) inptrp,
(const unsigned char *) inend,
(unsigned char **) &outbuf,
(unsigned char *) outerr,
&lirreversible EXTRA_LOOP_ARGS);
else
/* Run the conversion loop. */
nstatus = TO_LOOP (step, data,
(const unsigned char **) inptrp,
(const unsigned char *) inend,
(unsigned char **) &outbuf,
(unsigned char *) outerr,
&lirreversible EXTRA_LOOP_ARGS);
/* We must run out of output buffer space in this
rerun. */
assert (outbuf == outerr);
assert (nstatus == __GCONV_FULL_OUTPUT);
/* If we haven't consumed a single byte decrement
the invocation counter. */
if (__builtin_expect (outbuf == outstart, 0))
--data->__invocation_counter;
#endif /* reset input buffer */
}
/* Change the status. */
status = result;
}
else
/* All the output is consumed, we can make another run
if everything was ok. */
if (status == __GCONV_FULL_OUTPUT)
status = __GCONV_OK;
}
}
while (status == __GCONV_OK);
#ifdef END_LOOP
END_LOOP
#endif
/* If we are supposed to consume all character store now all of the
remaining characters in the `state' object. */
#if MAX_NEEDED_FROM > 1 || MAX_NEEDED_TO > 1
if (((MAX_NEEDED_FROM > 1 && FROM_DIRECTION)
|| (MAX_NEEDED_TO > 1 && !FROM_DIRECTION))
&& __builtin_expect (consume_incomplete, 0)
&& status == __GCONV_INCOMPLETE_INPUT)
{
# ifdef STORE_REST
mbstate_t *state = data->__statep;
STORE_REST
# else
size_t cnt;
/* Make sure the remaining bytes fit into the state objects
buffer. */
assert (inend - *inptrp < 4);
for (cnt = 0; *inptrp < inend; ++cnt)
data->__statep->__value.__wchb[cnt] = *(*inptrp)++;
data->__statep->__count &= ~7;
data->__statep->__count |= cnt;
# endif
}
#endif
}
return status;
}
#undef DEFINE_INIT
#undef CHARSET_NAME
#undef DEFINE_FINI
#undef MIN_NEEDED_FROM
#undef MIN_NEEDED_TO
#undef MAX_NEEDED_FROM
#undef MAX_NEEDED_TO
#undef DEFINE_DIRECTION_OBJECTS
#undef FROM_DIRECTION
#undef EMIT_SHIFT_TO_INIT
#undef FROM_LOOP
#undef TO_LOOP
#undef RESET_STATE
#undef RESET_INPUT_BUFFER
#undef FUNCTION_NAME
#undef PREPARE_LOOP
#undef END_LOOP
#undef ONE_DIRECTION
#undef STORE_REST
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