/* Conversion module for UTF-16. Copyright (C) 1999-2016 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper , 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 . */ #include #include #include #include #include #include #include /* 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 ONE_DIRECTION 0 #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 (__glibc_unlikely (data->__invocation_counter == 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 (__glibc_unlikely (outbuf + 2 > outend)) \ 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 (__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 \ synthesizing any desired plane 1-16 character. */ \ result = __GCONV_ILLEGAL_INPUT; \ if (! ignore_errors_p ()) \ break; \ inptr += 4; \ ++*irreversible; \ continue; \ } \ \ if (swap) \ { \ if (__glibc_unlikely (c >= 0x10000)) \ { \ if (__glibc_unlikely (c >= 0x110000)) \ { \ STANDARD_TO_LOOP_ERR_HANDLER (4); \ } \ \ /* Generate a surrogate character. */ \ if (__glibc_unlikely (outptr + 4 > outend)) \ { \ /* 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 (__glibc_unlikely (c >= 0x10000)) \ { \ if (__glibc_unlikely (c >= 0x110000)) \ { \ STANDARD_TO_LOOP_ERR_HANDLER (4); \ } \ \ /* Generate a surrogate character. */ \ if (__glibc_unlikely (outptr + 4 > outend)) \ { \ /* 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 /* 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 (__glibc_unlikely (inptr + 4 > inend)) \ { \ /* 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 (__glibc_unlikely (inptr + 4 > inend)) \ { \ /* 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 /* Now define the toplevel functions. */ #include