diff options
Diffstat (limited to 'iconvdata/utf-16.c')
| -rw-r--r-- | iconvdata/utf-16.c | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/iconvdata/utf-16.c b/iconvdata/utf-16.c new file mode 100644 index 0000000000..8348ce292d --- /dev/null +++ b/iconvdata/utf-16.c @@ -0,0 +1,330 @@ +/* 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 + + +/* 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; \ + 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 + + +/* 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 +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; + step->__data = new_data; + + if (var == 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 ((__BYTE_ORDER == __LITTLE_ENDIAN && var == UTF_16BE) \ + || (__BYTE_ORDER == __BIG_ENDIAN && var == UTF_16LE)) \ + { \ + 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 +#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 ((__BYTE_ORDER == __LITTLE_ENDIAN && var == UTF_16BE) \ + || (__BYTE_ORDER == __BIG_ENDIAN && var == UTF_16LE)) \ + { \ + 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 == BOM && var == UTF_16 && !step_data->__internal_use \ + && step_data->__invocation_counter == 0 && inptr == *inptrp) \ + { \ + /* This is the first word in the file and it is the BOM and \ + we are converting a file without specified byte order. \ + Simply sack the BOM. */ \ + inptr += 2; \ + continue; \ + } \ + \ + 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 +#include <iconv/loop.c> + + +/* Now define the toplevel functions. */ +#include <iconv/skeleton.c> |