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378 lines
11 KiB
C
378 lines
11 KiB
C
/* Conversion module for UTF-16.
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Copyright (C) 1999-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <byteswap.h>
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#include <dlfcn.h>
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#include <gconv.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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/* This is the Byte Order Mark character (BOM). */
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#define BOM 0xfeff
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/* And in the other byte order. */
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#define BOM_OE 0xfffe
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/* Definitions used in the body of the `gconv' function. */
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#define FROM_LOOP from_utf16_loop
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#define TO_LOOP to_utf16_loop
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#define DEFINE_INIT 0
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#define DEFINE_FINI 0
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#define MIN_NEEDED_FROM 2
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#define MAX_NEEDED_FROM 4
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#define MIN_NEEDED_TO 4
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#define ONE_DIRECTION 0
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#define FROM_DIRECTION (dir == from_utf16)
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#define PREPARE_LOOP \
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enum direction dir = ((struct utf16_data *) step->__data)->dir; \
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enum variant var = ((struct utf16_data *) step->__data)->var; \
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if (__glibc_unlikely (data->__invocation_counter == 0)) \
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{ \
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if (var == UTF_16) \
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{ \
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if (FROM_DIRECTION) \
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{ \
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/* We have to find out which byte order the file is \
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encoded in. */ \
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if (inptr + 2 > inend) \
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return (inptr == inend \
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? __GCONV_EMPTY_INPUT : __GCONV_INCOMPLETE_INPUT); \
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\
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if (get16u (inptr) == BOM) \
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/* Simply ignore the BOM character. */ \
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*inptrp = inptr += 2; \
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else if (get16u (inptr) == BOM_OE) \
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{ \
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data->__flags |= __GCONV_SWAP; \
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*inptrp = inptr += 2; \
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} \
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} \
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else if (!FROM_DIRECTION && !data->__internal_use) \
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{ \
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/* Emit the Byte Order Mark. */ \
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if (__glibc_unlikely (outbuf + 2 > outend)) \
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return __GCONV_FULL_OUTPUT; \
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\
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put16u (outbuf, BOM); \
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outbuf += 2; \
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} \
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} \
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else if ((var == UTF_16LE && BYTE_ORDER == BIG_ENDIAN) \
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|| (var == UTF_16BE && BYTE_ORDER == LITTLE_ENDIAN)) \
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data->__flags |= __GCONV_SWAP; \
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} \
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const int swap = data->__flags & __GCONV_SWAP;
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#define EXTRA_LOOP_ARGS , swap
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/* Direction of the transformation. */
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enum direction
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{
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illegal_dir,
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to_utf16,
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from_utf16
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};
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enum variant
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{
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illegal_var,
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UTF_16,
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UTF_16LE,
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UTF_16BE
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};
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struct utf16_data
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{
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enum direction dir;
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enum variant var;
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};
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extern int gconv_init (struct __gconv_step *step);
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int
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gconv_init (struct __gconv_step *step)
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{
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/* Determine which direction. */
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struct utf16_data *new_data;
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enum direction dir = illegal_dir;
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enum variant var = illegal_var;
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int result;
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if (__strcasecmp (step->__from_name, "UTF-16//") == 0)
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{
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dir = from_utf16;
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var = UTF_16;
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}
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else if (__strcasecmp (step->__to_name, "UTF-16//") == 0)
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{
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dir = to_utf16;
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var = UTF_16;
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}
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else if (__strcasecmp (step->__from_name, "UTF-16BE//") == 0)
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{
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dir = from_utf16;
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var = UTF_16BE;
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}
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else if (__strcasecmp (step->__to_name, "UTF-16BE//") == 0)
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{
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dir = to_utf16;
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var = UTF_16BE;
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}
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else if (__strcasecmp (step->__from_name, "UTF-16LE//") == 0)
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{
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dir = from_utf16;
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var = UTF_16LE;
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}
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else if (__strcasecmp (step->__to_name, "UTF-16LE//") == 0)
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{
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dir = to_utf16;
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var = UTF_16LE;
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}
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result = __GCONV_NOCONV;
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if (__builtin_expect (dir, to_utf16) != illegal_dir)
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{
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new_data = (struct utf16_data *) malloc (sizeof (struct utf16_data));
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result = __GCONV_NOMEM;
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if (new_data != NULL)
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{
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new_data->dir = dir;
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new_data->var = var;
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step->__data = new_data;
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if (dir == from_utf16)
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{
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step->__min_needed_from = MIN_NEEDED_FROM;
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step->__max_needed_from = MAX_NEEDED_FROM;
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step->__min_needed_to = MIN_NEEDED_TO;
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step->__max_needed_to = MIN_NEEDED_TO;
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}
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else
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{
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step->__min_needed_from = MIN_NEEDED_TO;
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step->__max_needed_from = MIN_NEEDED_TO;
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step->__min_needed_to = MIN_NEEDED_FROM;
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step->__max_needed_to = MAX_NEEDED_FROM;
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}
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step->__stateful = 0;
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result = __GCONV_OK;
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}
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}
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return result;
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}
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extern void gconv_end (struct __gconv_step *data);
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void
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gconv_end (struct __gconv_step *data)
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{
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free (data->__data);
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}
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/* Convert from the internal (UCS4-like) format to UTF-16. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_TO
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM
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#define LOOPFCT TO_LOOP
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#define BODY \
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{ \
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uint32_t c = get32 (inptr); \
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\
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if (__glibc_unlikely (c >= 0xd800 && c < 0xe000)) \
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{ \
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/* Surrogate characters in UCS-4 input are not valid. \
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We must catch this. If we let surrogates pass through, \
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attackers could make a security hole exploit by \
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synthesizing any desired plane 1-16 character. */ \
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result = __GCONV_ILLEGAL_INPUT; \
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if (! ignore_errors_p ()) \
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break; \
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inptr += 4; \
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++*irreversible; \
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continue; \
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} \
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\
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if (swap) \
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{ \
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if (__glibc_unlikely (c >= 0x10000)) \
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{ \
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if (__glibc_unlikely (c >= 0x110000)) \
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{ \
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STANDARD_TO_LOOP_ERR_HANDLER (4); \
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} \
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\
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/* Generate a surrogate character. */ \
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if (__glibc_unlikely (outptr + 4 > outend)) \
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{ \
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/* Overflow in the output buffer. */ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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put16 (outptr, bswap_16 (0xd7c0 + (c >> 10))); \
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outptr += 2; \
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put16 (outptr, bswap_16 (0xdc00 + (c & 0x3ff))); \
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} \
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else \
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put16 (outptr, bswap_16 (c)); \
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} \
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else \
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{ \
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if (__glibc_unlikely (c >= 0x10000)) \
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{ \
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if (__glibc_unlikely (c >= 0x110000)) \
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{ \
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STANDARD_TO_LOOP_ERR_HANDLER (4); \
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} \
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\
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/* Generate a surrogate character. */ \
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if (__glibc_unlikely (outptr + 4 > outend)) \
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{ \
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/* Overflow in the output buffer. */ \
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result = __GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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put16 (outptr, 0xd7c0 + (c >> 10)); \
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outptr += 2; \
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put16 (outptr, 0xdc00 + (c & 0x3ff)); \
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} \
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else \
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put16 (outptr, c); \
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} \
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outptr += 2; \
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inptr += 4; \
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}
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#define LOOP_NEED_FLAGS
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#define EXTRA_LOOP_DECLS \
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, int swap
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#include <iconv/loop.c>
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/* Convert from UTF-16 to the internal (UCS4-like) format. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_INPUT MAX_NEEDED_FROM
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
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#define LOOPFCT FROM_LOOP
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#define BODY \
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{ \
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uint16_t u1 = get16 (inptr); \
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\
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if (swap) \
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{ \
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u1 = bswap_16 (u1); \
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\
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if (__builtin_expect (u1 < 0xd800, 1) || u1 > 0xdfff) \
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{ \
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/* No surrogate. */ \
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put32 (outptr, u1); \
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inptr += 2; \
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} \
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else \
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{ \
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uint16_t u2; \
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\
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if (__glibc_unlikely (u1 >= 0xdc00)) \
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{ \
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/* This is no valid first word for a surrogate. */ \
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STANDARD_FROM_LOOP_ERR_HANDLER (2); \
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} \
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\
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/* It's a surrogate character. At least the first word says \
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it is. */ \
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if (__glibc_unlikely (inptr + 4 > inend)) \
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{ \
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/* We don't have enough input for another complete input \
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character. */ \
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result = __GCONV_INCOMPLETE_INPUT; \
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break; \
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} \
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\
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inptr += 2; \
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u2 = bswap_16 (get16 (inptr)); \
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if (__builtin_expect (u2 < 0xdc00, 0) \
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|| __builtin_expect (u2 > 0xdfff, 0)) \
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{ \
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/* This is no valid second word for a surrogate. */ \
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inptr -= 2; \
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STANDARD_FROM_LOOP_ERR_HANDLER (2); \
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} \
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\
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put32 (outptr, ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00)); \
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inptr += 2; \
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} \
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} \
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else \
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{ \
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if (__builtin_expect (u1 < 0xd800, 1) || u1 > 0xdfff) \
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{ \
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/* No surrogate. */ \
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put32 (outptr, u1); \
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inptr += 2; \
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} \
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else \
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{ \
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if (__glibc_unlikely (u1 >= 0xdc00)) \
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{ \
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/* This is no valid first word for a surrogate. */ \
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STANDARD_FROM_LOOP_ERR_HANDLER (2); \
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} \
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\
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/* It's a surrogate character. At least the first word says \
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it is. */ \
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if (__glibc_unlikely (inptr + 4 > inend)) \
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{ \
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/* We don't have enough input for another complete input \
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character. */ \
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result = __GCONV_INCOMPLETE_INPUT; \
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break; \
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} \
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\
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inptr += 2; \
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uint16_t u2 = get16 (inptr); \
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if (__builtin_expect (u2 < 0xdc00, 0) \
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|| __builtin_expect (u2 > 0xdfff, 0)) \
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{ \
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/* This is no valid second word for a surrogate. */ \
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inptr -= 2; \
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STANDARD_FROM_LOOP_ERR_HANDLER (2); \
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} \
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\
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put32 (outptr, ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00)); \
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inptr += 2; \
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} \
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} \
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outptr += 4; \
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}
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#define LOOP_NEED_FLAGS
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#define EXTRA_LOOP_DECLS \
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, int swap
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#include <iconv/loop.c>
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/* Now define the toplevel functions. */
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#include <iconv/skeleton.c>
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