| /* Conversion module for UTF-32. |
| Copyright (C) 1999-2016 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 ONE_DIRECTION 0 |
| #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 (__glibc_unlikely (data->__invocation_counter == 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 (__glibc_unlikely (outbuf + 4 > outend)) \ |
| 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 (__glibc_unlikely (c >= 0x110000)) \ |
| { \ |
| STANDARD_TO_LOOP_ERR_HANDLER (4); \ |
| } \ |
| else if (__glibc_unlikely (c >= 0xd800 && c < 0xe000)) \ |
| { \ |
| /* 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 (__glibc_unlikely (u1 >= 0x110000)) \ |
| { \ |
| /* 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> |