/* Conversion module for UTF-32. Copyright (C) 1999-2014 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 <http://www.gnu.org/licenses/>. */ #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 (__builtin_expect (data->__invocation_counter == 0, 0)) \ { \ /* We have to find out which byte order the file is encoded in. */ \ if (inptr + 4 > inend) \ return (inptr == inend \ ? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT); \ \ if (get32u (inptr) == BOM) \ /* Simply ignore the BOM character. */ \ *inptrp = inptr += 4; \ else if (get32u (inptr) == BOM_OE) \ { \ data->__flags |= __GCONV_SWAP; \ *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; \ } \ else if (__builtin_expect (data->__invocation_counter == 0, 0) \ && ((var == UTF_32LE && BYTE_ORDER == BIG_ENDIAN) \ || (var == UTF_32BE && BYTE_ORDER == LITTLE_ENDIAN))) \ data->__flags |= __GCONV_SWAP; \ swap = data->__flags & __GCONV_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; }; 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; 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_TO_LOOP_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. */ \ result = __GCONV_ILLEGAL_INPUT; \ if (! ignore_errors_p ()) \ break; \ inptr += 4; \ ++*irreversible; \ continue; \ } \ \ if (swap) \ c = bswap_32 (c); \ 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. */ \ STANDARD_FROM_LOOP_ERR_HANDLER (4); \ } \ \ 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>