| /* Conversion module for UTF-16. |
| Copyright (C) 1999-2014 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 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 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; \ |
| if (__builtin_expect (data->__invocation_counter == 0, 0)) \ |
| { \ |
| if (var == UTF_16) \ |
| { \ |
| if (FROM_DIRECTION) \ |
| { \ |
| /* We have to find out which byte order the file is \ |
| encoded in. */ \ |
| if (inptr + 2 > inend) \ |
| return (inptr == inend \ |
| ? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT); \ |
| \ |
| if (get16u (inptr) == BOM) \ |
| /* Simply ignore the BOM character. */ \ |
| *inptrp = inptr += 2; \ |
| else if (get16u (inptr) == BOM_OE) \ |
| { \ |
| data->__flags |= __GCONV_SWAP; \ |
| *inptrp = inptr += 2; \ |
| } \ |
| } \ |
| else if (!FROM_DIRECTION && !data->__internal_use) \ |
| { \ |
| /* Emit the Byte Order Mark. */ \ |
| if (__builtin_expect (outbuf + 2 > outend, 0)) \ |
| return __GCONV_FULL_OUTPUT; \ |
| \ |
| put16u (outbuf, BOM); \ |
| outbuf += 2; \ |
| } \ |
| } \ |
| else if ((var == UTF_16LE && BYTE_ORDER == BIG_ENDIAN) \ |
| || (var == UTF_16BE && BYTE_ORDER == LITTLE_ENDIAN)) \ |
| data->__flags |= __GCONV_SWAP; \ |
| } \ |
| const int swap = data->__flags & __GCONV_SWAP; |
| #define EXTRA_LOOP_ARGS , 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; |
| }; |
| |
| |
| extern int gconv_init (struct __gconv_step *step); |
| 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 (__builtin_expect (dir, to_utf16) != 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 (dir == from_utf16) |
| { |
| step->__min_needed_from = MIN_NEEDED_FROM; |
| step->__max_needed_from = MAX_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 = MAX_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-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 = get32 (inptr); \ |
| \ |
| 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 \ |
| synthesizing any desired plane 1-16 character. */ \ |
| result = __GCONV_ILLEGAL_INPUT; \ |
| if (! ignore_errors_p ()) \ |
| break; \ |
| inptr += 4; \ |
| ++*irreversible; \ |
| continue; \ |
| } \ |
| \ |
| if (swap) \ |
| { \ |
| if (__builtin_expect (c >= 0x10000, 0)) \ |
| { \ |
| if (__builtin_expect (c >= 0x110000, 0)) \ |
| { \ |
| STANDARD_TO_LOOP_ERR_HANDLER (4); \ |
| } \ |
| \ |
| /* Generate a surrogate character. */ \ |
| if (__builtin_expect (outptr + 4 > outend, 0)) \ |
| { \ |
| /* Overflow in the output buffer. */ \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| \ |
| put16 (outptr, bswap_16 (0xd7c0 + (c >> 10))); \ |
| outptr += 2; \ |
| put16 (outptr, bswap_16 (0xdc00 + (c & 0x3ff))); \ |
| } \ |
| else \ |
| put16 (outptr, bswap_16 (c)); \ |
| } \ |
| else \ |
| { \ |
| if (__builtin_expect (c >= 0x10000, 0)) \ |
| { \ |
| if (__builtin_expect (c >= 0x110000, 0)) \ |
| { \ |
| STANDARD_TO_LOOP_ERR_HANDLER (4); \ |
| } \ |
| \ |
| /* Generate a surrogate character. */ \ |
| if (__builtin_expect (outptr + 4 > outend, 0)) \ |
| { \ |
| /* Overflow in the output buffer. */ \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| \ |
| put16 (outptr, 0xd7c0 + (c >> 10)); \ |
| outptr += 2; \ |
| put16 (outptr, 0xdc00 + (c & 0x3ff)); \ |
| } \ |
| else \ |
| put16 (outptr, c); \ |
| } \ |
| outptr += 2; \ |
| inptr += 4; \ |
| } |
| #define LOOP_NEED_FLAGS |
| #define EXTRA_LOOP_DECLS \ |
| , 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 = get16 (inptr); \ |
| \ |
| if (swap) \ |
| { \ |
| u1 = bswap_16 (u1); \ |
| \ |
| if (__builtin_expect (u1 < 0xd800, 1) || u1 > 0xdfff) \ |
| { \ |
| /* No surrogate. */ \ |
| put32 (outptr, u1); \ |
| inptr += 2; \ |
| } \ |
| else \ |
| { \ |
| uint16_t u2; \ |
| \ |
| /* It's a surrogate character. At least the first word says \ |
| it is. */ \ |
| if (__builtin_expect (inptr + 4 > inend, 0)) \ |
| { \ |
| /* We don't have enough input for another complete input \ |
| character. */ \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| \ |
| inptr += 2; \ |
| u2 = bswap_16 (get16 (inptr)); \ |
| if (__builtin_expect (u2 < 0xdc00, 0) \ |
| || __builtin_expect (u2 > 0xdfff, 0)) \ |
| { \ |
| /* This is no valid second word for a surrogate. */ \ |
| inptr -= 2; \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (2); \ |
| } \ |
| \ |
| put32 (outptr, ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00)); \ |
| inptr += 2; \ |
| } \ |
| } \ |
| else \ |
| { \ |
| if (__builtin_expect (u1 < 0xd800, 1) || u1 > 0xdfff) \ |
| { \ |
| /* No surrogate. */ \ |
| put32 (outptr, u1); \ |
| inptr += 2; \ |
| } \ |
| else \ |
| { \ |
| /* It's a surrogate character. At least the first word says \ |
| it is. */ \ |
| if (__builtin_expect (inptr + 4 > inend, 0)) \ |
| { \ |
| /* We don't have enough input for another complete input \ |
| character. */ \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| \ |
| inptr += 2; \ |
| uint16_t u2 = get16 (inptr); \ |
| if (__builtin_expect (u2 < 0xdc00, 0) \ |
| || __builtin_expect (u2 > 0xdfff, 0)) \ |
| { \ |
| /* This is no valid second word for a surrogate. */ \ |
| inptr -= 2; \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (2); \ |
| } \ |
| \ |
| put32 (outptr, ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00)); \ |
| inptr += 2; \ |
| } \ |
| } \ |
| outptr += 4; \ |
| } |
| #define LOOP_NEED_FLAGS |
| #define EXTRA_LOOP_DECLS \ |
| , int swap |
| #include <iconv/loop.c> |
| |
| |
| /* Now define the toplevel functions. */ |
| #include <iconv/skeleton.c> |
