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------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- -- -- -- S Y S T E M . S T R I N G S . S T R E A M _ O P S -- -- -- -- B o d y -- -- -- -- Copyright (C) 2008-2010, 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. -- -- -- ------------------------------------------------------------------------------ pragma Compiler_Unit; with Ada.Streams; use Ada.Streams; with Ada.Streams.Stream_IO; use Ada.Streams.Stream_IO; with Ada.Unchecked_Conversion; with System.Stream_Attributes; use System; package body System.Strings.Stream_Ops is -- The following type describes the low-level IO mechanism used in package -- Stream_Ops_Internal. type IO_Kind is (Byte_IO, Block_IO); -- The following package provides an IO framework for strings. Depending -- on the version of System.Stream_Attributes as well as the size of -- formal parameter Character_Type, the package will either utilize block -- IO or character-by-character IO. generic type Character_Type is private; type String_Type is array (Positive range <>) of Character_Type; package Stream_Ops_Internal is function Input (Strm : access Root_Stream_Type'Class; IO : IO_Kind) return String_Type; procedure Output (Strm : access Root_Stream_Type'Class; Item : String_Type; IO : IO_Kind); procedure Read (Strm : access Root_Stream_Type'Class; Item : out String_Type; IO : IO_Kind); procedure Write (Strm : access Root_Stream_Type'Class; Item : String_Type; IO : IO_Kind); end Stream_Ops_Internal; ------------------------- -- Stream_Ops_Internal -- ------------------------- package body Stream_Ops_Internal is -- The following value represents the number of BITS allocated for the -- default block used in string IO. The sizes of all other types are -- calculated relative to this value. Default_Block_Size : constant := 512 * 8; -- Shorthand notation for stream element and character sizes C_Size : constant Integer := Character_Type'Size; SE_Size : constant Integer := Stream_Element'Size; -- The following constants describe the number of stream elements or -- characters that can fit into a default block. C_In_Default_Block : constant Integer := Default_Block_Size / C_Size; SE_In_Default_Block : constant Integer := Default_Block_Size / SE_Size; -- Buffer types subtype Default_Block is Stream_Element_Array (1 .. Stream_Element_Offset (SE_In_Default_Block)); subtype String_Block is String_Type (1 .. C_In_Default_Block); -- Conversions to and from Default_Block function To_Default_Block is new Ada.Unchecked_Conversion (String_Block, Default_Block); function To_String_Block is new Ada.Unchecked_Conversion (Default_Block, String_Block); ----------- -- Input -- ----------- function Input (Strm : access Root_Stream_Type'Class; IO : IO_Kind) return String_Type is begin if Strm = null then raise Constraint_Error; end if; declare Low : Positive; High : Positive; begin -- Read the bounds of the string Positive'Read (Strm, Low); Positive'Read (Strm, High); declare Item : String_Type (Low .. High); begin -- Read the character content of the string Read (Strm, Item, IO); return Item; end; end; end Input; ------------ -- Output -- ------------ procedure Output (Strm : access Root_Stream_Type'Class; Item : String_Type; IO : IO_Kind) is begin if Strm = null then raise Constraint_Error; end if; -- Write the bounds of the string Positive'Write (Strm, Item'First); Positive'Write (Strm, Item'Last); -- Write the character content of the string Write (Strm, Item, IO); end Output; ---------- -- Read -- ---------- procedure Read (Strm : access Root_Stream_Type'Class; Item : out String_Type; IO : IO_Kind) is begin if Strm = null then raise Constraint_Error; end if; -- Nothing to do if the desired string is empty if Item'Length = 0 then return; end if; -- Block IO if IO = Block_IO and then Stream_Attributes.Block_IO_OK then declare -- Determine the size in BITS of the block necessary to contain -- the whole string. Block_Size : constant Natural := (Item'Last - Item'First + 1) * C_Size; -- Item can be larger than what the default block can store, -- determine the number of whole reads necessary to read the -- string. Blocks : constant Natural := Block_Size / Default_Block_Size; -- The size of Item may not be a multiple of the default block -- size, determine the size of the remaining chunk in BITS. Rem_Size : constant Natural := Block_Size mod Default_Block_Size; -- String indexes Low : Positive := Item'First; High : Positive := Low + C_In_Default_Block - 1; -- End of stream error detection Last : Stream_Element_Offset := 0; Sum : Stream_Element_Offset := 0; begin -- Step 1: If the string is too large, read in individual -- chunks the size of the default block. if Blocks > 0 then declare Block : Default_Block; begin for Counter in 1 .. Blocks loop Read (Strm.all, Block, Last); Item (Low .. High) := To_String_Block (Block); Low := High + 1; High := Low + C_In_Default_Block - 1; Sum := Sum + Last; Last := 0; end loop; end; end if; -- Step 2: Read in any remaining elements if Rem_Size > 0 then declare subtype Rem_Block is Stream_Element_Array (1 .. Stream_Element_Offset (Rem_Size / SE_Size)); subtype Rem_String_Block is String_Type (1 .. Rem_Size / C_Size); function To_Rem_String_Block is new Ada.Unchecked_Conversion (Rem_Block, Rem_String_Block); Block : Rem_Block; begin Read (Strm.all, Block, Last); Item (Low .. Item'Last) := To_Rem_String_Block (Block); Sum := Sum + Last; end; end if; -- Step 3: Potential error detection. The sum of all the -- chunks is less than we initially wanted to read. In other -- words, the stream does not contain enough elements to fully -- populate Item. if (Integer (Sum) * SE_Size) / C_Size < Item'Length then raise End_Error; end if; end; -- Byte IO else declare C : Character_Type; begin for Index in Item'First .. Item'Last loop Character_Type'Read (Strm, C); Item (Index) := C; end loop; end; end if; end Read; ----------- -- Write -- ----------- procedure Write (Strm : access Root_Stream_Type'Class; Item : String_Type; IO : IO_Kind) is begin if Strm = null then raise Constraint_Error; end if; -- Nothing to do if the input string is empty if Item'Length = 0 then return; end if; -- Block IO if IO = Block_IO and then Stream_Attributes.Block_IO_OK then declare -- Determine the size in BITS of the block necessary to contain -- the whole string. Block_Size : constant Natural := Item'Length * C_Size; -- Item can be larger than what the default block can store, -- determine the number of whole writes necessary to output the -- string. Blocks : constant Natural := Block_Size / Default_Block_Size; -- The size of Item may not be a multiple of the default block -- size, determine the size of the remaining chunk. Rem_Size : constant Natural := Block_Size mod Default_Block_Size; -- String indexes Low : Positive := Item'First; High : Positive := Low + C_In_Default_Block - 1; begin -- Step 1: If the string is too large, write out individual -- chunks the size of the default block. for Counter in 1 .. Blocks loop Write (Strm.all, To_Default_Block (Item (Low .. High))); Low := High + 1; High := Low + C_In_Default_Block - 1; end loop; -- Step 2: Write out any remaining elements if Rem_Size > 0 then declare subtype Rem_Block is Stream_Element_Array (1 .. Stream_Element_Offset (Rem_Size / SE_Size)); subtype Rem_String_Block is String_Type (1 .. Rem_Size / C_Size); function To_Rem_Block is new Ada.Unchecked_Conversion (Rem_String_Block, Rem_Block); begin Write (Strm.all, To_Rem_Block (Item (Low .. Item'Last))); end; end if; end; -- Byte IO else for Index in Item'First .. Item'Last loop Character_Type'Write (Strm, Item (Index)); end loop; end if; end Write; end Stream_Ops_Internal; -- Specific instantiations for all Ada string types package String_Ops is new Stream_Ops_Internal (Character_Type => Character, String_Type => String); package Wide_String_Ops is new Stream_Ops_Internal (Character_Type => Wide_Character, String_Type => Wide_String); package Wide_Wide_String_Ops is new Stream_Ops_Internal (Character_Type => Wide_Wide_Character, String_Type => Wide_Wide_String); ------------------ -- String_Input -- ------------------ function String_Input (Strm : access Ada.Streams.Root_Stream_Type'Class) return String is begin return String_Ops.Input (Strm, Byte_IO); end String_Input; ------------------------- -- String_Input_Blk_IO -- ------------------------- function String_Input_Blk_IO (Strm : access Ada.Streams.Root_Stream_Type'Class) return String is begin return String_Ops.Input (Strm, Block_IO); end String_Input_Blk_IO; ------------------- -- String_Output -- ------------------- procedure String_Output (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : String) is begin String_Ops.Output (Strm, Item, Byte_IO); end String_Output; -------------------------- -- String_Output_Blk_IO -- -------------------------- procedure String_Output_Blk_IO (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : String) is begin String_Ops.Output (Strm, Item, Block_IO); end String_Output_Blk_IO; ----------------- -- String_Read -- ----------------- procedure String_Read (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : out String) is begin String_Ops.Read (Strm, Item, Byte_IO); end String_Read; ------------------------ -- String_Read_Blk_IO -- ------------------------ procedure String_Read_Blk_IO (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : out String) is begin String_Ops.Read (Strm, Item, Block_IO); end String_Read_Blk_IO; ------------------ -- String_Write -- ------------------ procedure String_Write (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : String) is begin String_Ops.Write (Strm, Item, Byte_IO); end String_Write; ------------------------- -- String_Write_Blk_IO -- ------------------------- procedure String_Write_Blk_IO (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : String) is begin String_Ops.Write (Strm, Item, Block_IO); end String_Write_Blk_IO; ----------------------- -- Wide_String_Input -- ----------------------- function Wide_String_Input (Strm : access Ada.Streams.Root_Stream_Type'Class) return Wide_String is begin return Wide_String_Ops.Input (Strm, Byte_IO); end Wide_String_Input; ------------------------------ -- Wide_String_Input_Blk_IO -- ------------------------------ function Wide_String_Input_Blk_IO (Strm : access Ada.Streams.Root_Stream_Type'Class) return Wide_String is begin return Wide_String_Ops.Input (Strm, Block_IO); end Wide_String_Input_Blk_IO; ------------------------ -- Wide_String_Output -- ------------------------ procedure Wide_String_Output (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : Wide_String) is begin Wide_String_Ops.Output (Strm, Item, Byte_IO); end Wide_String_Output; ------------------------------- -- Wide_String_Output_Blk_IO -- ------------------------------- procedure Wide_String_Output_Blk_IO (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : Wide_String) is begin Wide_String_Ops.Output (Strm, Item, Block_IO); end Wide_String_Output_Blk_IO; ---------------------- -- Wide_String_Read -- ---------------------- procedure Wide_String_Read (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : out Wide_String) is begin Wide_String_Ops.Read (Strm, Item, Byte_IO); end Wide_String_Read; ----------------------------- -- Wide_String_Read_Blk_IO -- ----------------------------- procedure Wide_String_Read_Blk_IO (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : out Wide_String) is begin Wide_String_Ops.Read (Strm, Item, Block_IO); end Wide_String_Read_Blk_IO; ----------------------- -- Wide_String_Write -- ----------------------- procedure Wide_String_Write (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : Wide_String) is begin Wide_String_Ops.Write (Strm, Item, Byte_IO); end Wide_String_Write; ------------------------------ -- Wide_String_Write_Blk_IO -- ------------------------------ procedure Wide_String_Write_Blk_IO (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : Wide_String) is begin Wide_String_Ops.Write (Strm, Item, Block_IO); end Wide_String_Write_Blk_IO; ---------------------------- -- Wide_Wide_String_Input -- ---------------------------- function Wide_Wide_String_Input (Strm : access Ada.Streams.Root_Stream_Type'Class) return Wide_Wide_String is begin return Wide_Wide_String_Ops.Input (Strm, Byte_IO); end Wide_Wide_String_Input; ----------------------------------- -- Wide_Wide_String_Input_Blk_IO -- ----------------------------------- function Wide_Wide_String_Input_Blk_IO (Strm : access Ada.Streams.Root_Stream_Type'Class) return Wide_Wide_String is begin return Wide_Wide_String_Ops.Input (Strm, Block_IO); end Wide_Wide_String_Input_Blk_IO; ----------------------------- -- Wide_Wide_String_Output -- ----------------------------- procedure Wide_Wide_String_Output (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : Wide_Wide_String) is begin Wide_Wide_String_Ops.Output (Strm, Item, Byte_IO); end Wide_Wide_String_Output; ------------------------------------ -- Wide_Wide_String_Output_Blk_IO -- ------------------------------------ procedure Wide_Wide_String_Output_Blk_IO (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : Wide_Wide_String) is begin Wide_Wide_String_Ops.Output (Strm, Item, Block_IO); end Wide_Wide_String_Output_Blk_IO; --------------------------- -- Wide_Wide_String_Read -- --------------------------- procedure Wide_Wide_String_Read (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : out Wide_Wide_String) is begin Wide_Wide_String_Ops.Read (Strm, Item, Byte_IO); end Wide_Wide_String_Read; ---------------------------------- -- Wide_Wide_String_Read_Blk_IO -- ---------------------------------- procedure Wide_Wide_String_Read_Blk_IO (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : out Wide_Wide_String) is begin Wide_Wide_String_Ops.Read (Strm, Item, Block_IO); end Wide_Wide_String_Read_Blk_IO; ---------------------------- -- Wide_Wide_String_Write -- ---------------------------- procedure Wide_Wide_String_Write (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : Wide_Wide_String) is begin Wide_Wide_String_Ops.Write (Strm, Item, Byte_IO); end Wide_Wide_String_Write; ----------------------------------- -- Wide_Wide_String_Write_Blk_IO -- ----------------------------------- procedure Wide_Wide_String_Write_Blk_IO (Strm : access Ada.Streams.Root_Stream_Type'Class; Item : Wide_Wide_String) is begin Wide_Wide_String_Ops.Write (Strm, Item, Block_IO); end Wide_Wide_String_Write_Blk_IO; end System.Strings.Stream_Ops;
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