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Diffstat (limited to 'gcc/ada/a-suewst.adb')
| -rw-r--r-- | gcc/ada/a-suewst.adb | 370 |
1 files changed, 0 insertions, 370 deletions
diff --git a/gcc/ada/a-suewst.adb b/gcc/ada/a-suewst.adb deleted file mode 100644 index c0855d3..0000000 --- a/gcc/ada/a-suewst.adb +++ /dev/null @@ -1,370 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT RUN-TIME COMPONENTS -- --- -- --- ADA.STRINGS.UTF_ENCODING.WIDE_STRINGS -- --- -- --- B o d y -- --- -- --- Copyright (C) 2010-2012, Free Software Foundation, Inc. -- --- -- --- GNAT is free software; you can redistribute it and/or modify it under -- --- terms of the GNU General Public License as published by the Free Soft- -- --- ware Foundation; either version 3, or (at your option) any later ver- -- --- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- --- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- --- or FITNESS FOR A PARTICULAR PURPOSE. -- --- -- --- As a special exception under Section 7 of GPL version 3, you are granted -- --- additional permissions described in the GCC Runtime Library Exception, -- --- version 3.1, as published by the Free Software Foundation. -- --- -- --- You should have received a copy of the GNU General Public License and -- --- a copy of the GCC Runtime Library Exception along with this program; -- --- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- --- <http://www.gnu.org/licenses/>. -- --- -- --- GNAT was originally developed by the GNAT team at New York University. -- --- Extensive contributions were provided by Ada Core Technologies Inc. -- --- -- ------------------------------------------------------------------------------- - -package body Ada.Strings.UTF_Encoding.Wide_Strings is - use Interfaces; - - ------------ - -- Decode -- - ------------ - - -- Decode UTF-8/UTF-16BE/UTF-16LE input to Wide_String - - function Decode - (Item : UTF_String; - Input_Scheme : Encoding_Scheme) return Wide_String - is - begin - if Input_Scheme = UTF_8 then - return Decode (Item); - else - return Decode (To_UTF_16 (Item, Input_Scheme)); - end if; - end Decode; - - -- Decode UTF-8 input to Wide_String - - function Decode (Item : UTF_8_String) return Wide_String is - Result : Wide_String (1 .. Item'Length); - -- Result string (worst case is same length as input) - - Len : Natural := 0; - -- Length of result stored so far - - Iptr : Natural; - -- Input Item pointer - - C : Unsigned_8; - R : Unsigned_16; - - procedure Get_Continuation; - -- Reads a continuation byte of the form 10xxxxxx, shifts R left by 6 - -- bits, and or's in the xxxxxx to the low order 6 bits. On return Ptr - -- is incremented. Raises exception if continuation byte does not exist - -- or is invalid. - - ---------------------- - -- Get_Continuation -- - ---------------------- - - procedure Get_Continuation is - begin - if Iptr > Item'Last then - Raise_Encoding_Error (Iptr - 1); - - else - C := To_Unsigned_8 (Item (Iptr)); - Iptr := Iptr + 1; - - if C not in 2#10_000000# .. 2#10_111111# then - Raise_Encoding_Error (Iptr - 1); - else - R := Shift_Left (R, 6) or Unsigned_16 (C and 2#00_111111#); - end if; - end if; - end Get_Continuation; - - -- Start of processing for Decode - - begin - Iptr := Item'First; - - -- Skip BOM at start - - if Item'Length >= 3 - and then Item (Iptr .. Iptr + 2) = BOM_8 - then - Iptr := Iptr + 3; - - -- Error if bad BOM - - elsif Item'Length >= 2 - and then (Item (Iptr .. Iptr + 1) = BOM_16BE - or else - Item (Iptr .. Iptr + 1) = BOM_16LE) - then - Raise_Encoding_Error (Iptr); - end if; - - while Iptr <= Item'Last loop - C := To_Unsigned_8 (Item (Iptr)); - Iptr := Iptr + 1; - - -- Codes in the range 16#00# - 16#7F# are represented as - -- 0xxxxxxx - - if C <= 16#7F# then - R := Unsigned_16 (C); - - -- No initial code can be of the form 10xxxxxx. Such codes are used - -- only for continuations. - - elsif C <= 2#10_111111# then - Raise_Encoding_Error (Iptr - 1); - - -- Codes in the range 16#80# - 16#7FF# are represented as - -- 110yyyxx 10xxxxxx - - elsif C <= 2#110_11111# then - R := Unsigned_16 (C and 2#000_11111#); - Get_Continuation; - - -- Codes in the range 16#800# - 16#FFFF# are represented as - -- 1110yyyy 10yyyyxx 10xxxxxx - - elsif C <= 2#1110_1111# then - R := Unsigned_16 (C and 2#0000_1111#); - Get_Continuation; - Get_Continuation; - - -- Codes in the range 16#10000# - 16#10FFFF# are represented as - -- 11110zzz 10zzyyyy 10yyyyxx 10xxxxxx - - -- Such codes are out of range for Wide_String output - - else - Raise_Encoding_Error (Iptr - 1); - end if; - - Len := Len + 1; - Result (Len) := Wide_Character'Val (R); - end loop; - - return Result (1 .. Len); - end Decode; - - -- Decode UTF-16 input to Wide_String - - function Decode (Item : UTF_16_Wide_String) return Wide_String is - Result : Wide_String (1 .. Item'Length); - -- Result is same length as input (possibly minus 1 if BOM present) - - Len : Natural := 0; - -- Length of result - - Iptr : Natural; - -- Index of next Item element - - C : Unsigned_16; - - begin - -- Skip UTF-16 BOM at start - - Iptr := Item'First; - - if Item'Length > 0 and then Item (Iptr) = BOM_16 (1) then - Iptr := Iptr + 1; - end if; - - -- Loop through input characters - - while Iptr <= Item'Last loop - C := To_Unsigned_16 (Item (Iptr)); - Iptr := Iptr + 1; - - -- Codes in the range 16#0000#..16#D7FF# or 16#E000#..16#FFFD# - -- represent their own value. - - if C <= 16#D7FF# or else C in 16#E000# .. 16#FFFD# then - Len := Len + 1; - Result (Len) := Wide_Character'Val (C); - - -- Codes in the range 16#D800#..16#DBFF# represent the first of the - -- two surrogates used to encode the range 16#01_000#..16#10_FFFF". - -- Such codes are out of range for 16-bit output. - - -- The case of input in the range 16#DC00#..16#DFFF# must never - -- occur, since it means we have a second surrogate character with - -- no corresponding first surrogate. - - -- Codes in the range 16#FFFE# .. 16#FFFF# are also invalid since - -- they conflict with codes used for BOM values. - - -- Thus all remaining codes are invalid - - else - Raise_Encoding_Error (Iptr - 1); - end if; - end loop; - - return Result (1 .. Len); - end Decode; - - ------------ - -- Encode -- - ------------ - - -- Encode Wide_String in UTF-8, UTF-16BE or UTF-16LE - - function Encode - (Item : Wide_String; - Output_Scheme : Encoding_Scheme; - Output_BOM : Boolean := False) return UTF_String - is - begin - -- Case of UTF_8 - - if Output_Scheme = UTF_8 then - return Encode (Item, Output_BOM); - - -- Case of UTF_16LE or UTF_16BE, use UTF-16 intermediary - - else - return From_UTF_16 (UTF_16_Wide_String'(Encode (Item)), - Output_Scheme, Output_BOM); - end if; - end Encode; - - -- Encode Wide_String in UTF-8 - - function Encode - (Item : Wide_String; - Output_BOM : Boolean := False) return UTF_8_String - is - Result : UTF_8_String (1 .. 3 * Item'Length + 3); - -- Worst case is three bytes per input byte + space for BOM - - Len : Natural; - -- Number of output codes stored in Result - - C : Unsigned_16; - -- Single input character - - procedure Store (C : Unsigned_16); - pragma Inline (Store); - -- Store one output code, C is in the range 0 .. 255 - - ----------- - -- Store -- - ----------- - - procedure Store (C : Unsigned_16) is - begin - Len := Len + 1; - Result (Len) := Character'Val (C); - end Store; - - -- Start of processing for UTF8_Encode - - begin - -- Output BOM if required - - if Output_BOM then - Result (1 .. 3) := BOM_8; - Len := 3; - else - Len := 0; - end if; - - -- Loop through characters of input - - for J in Item'Range loop - C := To_Unsigned_16 (Item (J)); - - -- Codes in the range 16#00# - 16#7F# are represented as - -- 0xxxxxxx - - if C <= 16#7F# then - Store (C); - - -- Codes in the range 16#80# - 16#7FF# are represented as - -- 110yyyxx 10xxxxxx - - elsif C <= 16#7FF# then - Store (2#110_00000# or Shift_Right (C, 6)); - Store (2#10_000000# or (C and 2#00_111111#)); - - -- Codes in the range 16#800# - 16#FFFF# are represented as - -- 1110yyyy 10yyyyxx 10xxxxxx - - else - Store (2#1110_0000# or Shift_Right (C, 12)); - Store (2#10_000000# or - Shift_Right (C and 2#111111_000000#, 6)); - Store (2#10_000000# or (C and 2#00_111111#)); - end if; - end loop; - - return Result (1 .. Len); - end Encode; - - -- Encode Wide_String in UTF-16 - - function Encode - (Item : Wide_String; - Output_BOM : Boolean := False) return UTF_16_Wide_String - is - Result : UTF_16_Wide_String - (1 .. Item'Length + Boolean'Pos (Output_BOM)); - -- Output is same length as input + possible BOM - - Len : Integer; - -- Length of output string - - C : Unsigned_16; - - begin - -- Output BOM if required - - if Output_BOM then - Result (1) := BOM_16 (1); - Len := 1; - else - Len := 0; - end if; - - -- Loop through input characters encoding them - - for Iptr in Item'Range loop - C := To_Unsigned_16 (Item (Iptr)); - - -- Codes in the range 16#0000#..16#D7FF# or 16#E000#..16#FFFD# are - -- output unchanged. - - if C <= 16#D7FF# or else C in 16#E000# .. 16#FFFD# then - Len := Len + 1; - Result (Len) := Wide_Character'Val (C); - - -- Codes in the range 16#D800#..16#DFFF# should never appear in the - -- input, since no valid Unicode characters are in this range (which - -- would conflict with the UTF-16 surrogate encodings). Similarly - -- codes in the range 16#FFFE#..16#FFFF conflict with BOM codes. - -- Thus all remaining codes are illegal. - - else - Raise_Encoding_Error (Iptr); - end if; - end loop; - - return Result; - end Encode; - -end Ada.Strings.UTF_Encoding.Wide_Strings; |