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/* Conversion module for UTF-16.
Copyright (C) 1999, 2000 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 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. */
#include <byteswap.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 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; \
int swap = ((struct utf16_data *) step->__data)->swap; \
if (FROM_DIRECTION || var == UTF_16) \
{ \
if (data->__invocation_counter == 0) \
{ \
/* We have to find out which byte order the file is encoded in. */ \
if (inptr + 2 > inbufend) \
return __GCONV_EMPTY_INPUT; \
\
if (*(uint16_t *) inptr == BOM) \
/* Simply ignore the BOM character. */ \
inptr += 2; \
else if (*(uint16_t *) inptr == BOM_OE) \
{ \
((struct utf16_data *) step->__data)->swap = 1; \
inptr += 2; \
} \
} \
} \
else if (!FROM_DIRECTION && var == UTF_16 && !data->__internal_use \
&& data->__invocation_counter == 0) \
{ \
/* Emit the Byte Order Mark. */ \
if (outbuf + 2 > outend) \
return __GCONV_FULL_OUTPUT; \
\
*(uint16_t *) outbuf = BOM; \
outbuf += 2; \
}
#define EXTRA_LOOP_ARGS , var, data, 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;
int swap;
};
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 (dir != 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;
new_data->swap = ((var == UTF_16LE && BYTE_ORDER == BIG_ENDIAN)
|| (var == UTF_16BE
&& BYTE_ORDER == LITTLE_ENDIAN));
step->__data = new_data;
if (dir == from_utf16)
{
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;
}
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 = *((uint32_t *) inptr); \
\
if (swap) \
{ \
if (c >= 0x10000) \
{ \
if (c >= 0x110000) \
{ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
\
/* Generate a surrogate character. */ \
if (NEED_LENGTH_TEST && outptr + 4 > outend) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
*((uint16_t *) outptr) = bswap_16 (0xd7c0 + (c >> 10)); \
outptr += 2; \
*((uint16_t *) outptr) = bswap_16 (0xdc00 + (c & 0x3ff)); \
} \
else \
*((uint16_t *) outptr) = bswap_16 (c); \
} \
else \
{ \
if (c >= 0x10000) \
{ \
if (c >= 0x110000) \
{ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
\
/* Generate a surrogate character. */ \
if (NEED_LENGTH_TEST && outptr + 4 > outend) \
{ \
/* Overflow in the output buffer. */ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
\
*((uint16_t *) outptr) = 0xd7c0 + (c >> 10); \
outptr += 2; \
*((uint16_t *) outptr) = 0xdc00 + (c & 0x3ff); \
} \
else \
*((uint16_t *) outptr) = c; \
} \
outptr += 2; \
inptr += 4; \
}
#define EXTRA_LOOP_DECLS \
, enum variant var, struct __gconv_step_data *step_data, 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 = *(uint16_t *) inptr; \
\
if (swap) \
{ \
u1 = bswap_16 (u1); \
\
if (u1 < 0xd800 || u1 > 0xdfff) \
{ \
/* No surrogate. */ \
*((uint32_t *) outptr) = u1; \
inptr += 2; \
} \
else \
{ \
uint16_t u2; \
\
/* It's a surrogate character. At least the first word says \
it is. */ \
if (NEED_LENGTH_TEST && inptr + 4 > inend) \
{ \
/* We don't have enough input for another complete input \
character. */ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
u2 = bswap_16 (((uint16_t *) inptr)[1]); \
if (u2 < 0xdc00 || u2 >= 0xdfff) \
{ \
/* This is no valid second word for a surrogate. */ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
\
*((uint32_t *) outptr) = ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00); \
inptr += 4; \
} \
} \
else \
{ \
if (u1 < 0xd800 || u1 > 0xdfff) \
{ \
/* No surrogate. */ \
*((uint32_t *) outptr) = u1; \
inptr += 2; \
} \
else \
{ \
uint16_t u2; \
\
/* It's a surrogate character. At least the first word says \
it is. */ \
if (NEED_LENGTH_TEST && inptr + 4 > inend) \
{ \
/* We don't have enough input for another complete input \
character. */ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
u2 = ((uint16_t *) inptr)[1]; \
if (u2 < 0xdc00 || u2 >= 0xdfff) \
{ \
/* This is no valid second word for a surrogate. */ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
\
*((uint32_t *) outptr) = ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00); \
inptr += 4; \
} \
} \
outptr += 4; \
}
#define EXTRA_LOOP_DECLS \
, enum variant var, struct __gconv_step_data *step_data, int swap
#include <iconv/loop.c>
/* Now define the toplevel functions. */
#include <iconv/skeleton.c>
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