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Diffstat (limited to 'iconvdata/utf-32.c')
| -rw-r--r-- | iconvdata/utf-32.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/iconvdata/utf-32.c b/iconvdata/utf-32.c new file mode 100644 index 0000000000..2e245c9173 --- /dev/null +++ b/iconvdata/utf-32.c @@ -0,0 +1,270 @@ +/* Conversion module for UTF-32. + Copyright (C) 1999, 2000, 2001 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 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 <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 0x0000feffu +/* And in the other byte order. */ +#define BOM_OE 0xfffe0000u + + +/* Definitions used in the body of the `gconv' function. */ +#define FROM_LOOP from_utf32_loop +#define TO_LOOP to_utf32_loop +#define DEFINE_INIT 0 +#define DEFINE_FINI 0 +#define MIN_NEEDED_FROM 4 +#define MIN_NEEDED_TO 4 +#define FROM_DIRECTION (dir == from_utf32) +#define PREPARE_LOOP \ + enum direction dir = ((struct utf32_data *) step->__data)->dir; \ + enum variant var = ((struct utf32_data *) step->__data)->var; \ + int swap; \ + if (FROM_DIRECTION && var == UTF_32) \ + { \ + if (data->__invocation_counter == 0) \ + { \ + /* We have to find out which byte order the file is encoded in. */ \ + if (inptr + 4 > inend) \ + return __GCONV_EMPTY_INPUT; \ + \ + if (get32u (inptr) == BOM) \ + /* Simply ignore the BOM character. */ \ + *inptrp = inptr += 4; \ + else if (get32u (inptr) == BOM_OE) \ + { \ + ((struct utf32_data *) step->__data)->swap = 1; \ + *inptrp = inptr += 4; \ + } \ + } \ + } \ + else if (!FROM_DIRECTION && var == UTF_32 && !data->__internal_use \ + && data->__invocation_counter == 0) \ + { \ + /* Emit the Byte Order Mark. */ \ + if (__builtin_expect (outbuf + 4 > outend, 0)) \ + return __GCONV_FULL_OUTPUT; \ + \ + put32u (outbuf, BOM); \ + outbuf += 4; \ + } \ + swap = ((struct utf32_data *) step->__data)->swap; +#define EXTRA_LOOP_ARGS , var, swap + + +/* Direction of the transformation. */ +enum direction +{ + illegal_dir, + to_utf32, + from_utf32 +}; + +enum variant +{ + illegal_var, + UTF_32, + UTF_32LE, + UTF_32BE +}; + +struct utf32_data +{ + enum direction dir; + enum variant var; + int swap; +}; + + +extern int gconv_init (struct __gconv_step *step); +int +gconv_init (struct __gconv_step *step) +{ + /* Determine which direction. */ + struct utf32_data *new_data; + enum direction dir = illegal_dir; + enum variant var = illegal_var; + int result; + + if (__strcasecmp (step->__from_name, "UTF-32//") == 0) + { + dir = from_utf32; + var = UTF_32; + } + else if (__strcasecmp (step->__to_name, "UTF-32//") == 0) + { + dir = to_utf32; + var = UTF_32; + } + else if (__strcasecmp (step->__from_name, "UTF-32BE//") == 0) + { + dir = from_utf32; + var = UTF_32BE; + } + else if (__strcasecmp (step->__to_name, "UTF-32BE//") == 0) + { + dir = to_utf32; + var = UTF_32BE; + } + else if (__strcasecmp (step->__from_name, "UTF-32LE//") == 0) + { + dir = from_utf32; + var = UTF_32LE; + } + else if (__strcasecmp (step->__to_name, "UTF-32LE//") == 0) + { + dir = to_utf32; + var = UTF_32LE; + } + + result = __GCONV_NOCONV; + if (__builtin_expect (dir, to_utf32) != illegal_dir) + { + new_data = (struct utf32_data *) malloc (sizeof (struct utf32_data)); + + result = __GCONV_NOMEM; + if (new_data != NULL) + { + new_data->dir = dir; + new_data->var = var; + new_data->swap = ((var == UTF_32LE && BYTE_ORDER == BIG_ENDIAN) + || (var == UTF_32BE + && BYTE_ORDER == LITTLE_ENDIAN)); + step->__data = new_data; + + if (dir == from_utf32) + { + 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; +} + + +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-32. */ +#define MIN_NEEDED_INPUT MIN_NEEDED_TO +#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM +#define LOOPFCT TO_LOOP +#define BODY \ + { \ + uint32_t c = get32 (inptr); \ + \ + if (__builtin_expect (c >= 0x110000, 0)) \ + { \ + STANDARD_ERR_HANDLER (4); \ + } \ + else if (__builtin_expect (c >= 0xd800 && c < 0xe000, 0)) \ + { \ + /* 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 \ + generating "irregular UTF-32" sequences. */ \ + if (! ignore_errors_p ()) \ + { \ + result = __GCONV_ILLEGAL_INPUT; \ + break; \ + } \ + inptr += 4; \ + ++*irreversible; \ + continue; \ + } \ + \ + if (swap) \ + put32 (outptr, bswap_32 (c)); \ + else \ + put32 (outptr, c); \ + \ + outptr += 4; \ + inptr += 4; \ + } +#define LOOP_NEED_FLAGS +#define EXTRA_LOOP_DECLS \ + , enum variant var, int swap +#include <iconv/loop.c> + + +/* Convert from UTF-32 to the internal (UCS4-like) format. */ +#define MIN_NEEDED_INPUT MIN_NEEDED_FROM +#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO +#define LOOPFCT FROM_LOOP +#define BODY \ + { \ + uint32_t u1 = get32 (inptr); \ + \ + if (swap) \ + u1 = bswap_32 (u1); \ + \ + if (__builtin_expect (u1 >= 0x110000, 0)) \ + { \ + /* This is illegal. */ \ + if (! ignore_errors_p ()) \ + { \ + /* This is an illegal character. */ \ + result = __GCONV_ILLEGAL_INPUT; \ + break; \ + } \ + \ + inptr += 4; \ + ++*irreversible; \ + continue; \ + } \ + \ + put32 (outptr, u1); \ + inptr += 4; \ + outptr += 4; \ + } +#define LOOP_NEED_FLAGS +#define EXTRA_LOOP_DECLS \ + , enum variant var, int swap +#include <iconv/loop.c> + + +/* Now define the toplevel functions. */ +#include <iconv/skeleton.c> |