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implemented some functions h2-io-file.

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renamed h2-sysapi to h2-os
This commit is contained in:
hyung-hwan
2014-06-05 15:26:37 +00:00
parent ef50de7e0f
commit 230a547dc0
10 changed files with 339 additions and 78 deletions
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212
h2/lib/h2-io-file.adb
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@ -1,3 +1,5 @@
with H2.Ascii;
separate (H2.IO)
package body File is
@ -7,7 +9,10 @@ package body File is
Flag: in Flag_Record;
Pool: in Storage_Pool_Pointer := null) is
begin
Sysapi.File.Open (File.File, Name, flag, Pool => Pool);
OS.File.Open (File.File, Name, Flag, Pool => Pool);
File.Rbuf.Length := 0;
File.Wbuf.Length := 0;
File.EOF := Standard.False;
end Open;
procedure Open (File: in out File_Record;
@ -15,41 +20,226 @@ package body File is
Flag: in Flag_Record;
Pool: in Storage_Pool_Pointer := null) is
begin
Sysapi.File.Open (File.File, Name, flag, Pool => Pool);
OS.File.Open (File.File, Name, Flag, Pool => Pool);
File.Rbuf.Length := 0;
File.Wbuf.Length := 0;
File.EOF := Standard.False;
end Open;
procedure Close (File: in out File_Record) is
begin
Sysapi.File.Close (File.File);
OS.File.Close (File.File);
File.File := null;
File.Last := System_Length'First;
end Close;
procedure OS_Read_File (File: in out File_Record;
Buffer: in out System_Byte_Array;
Length: out System_Length) is
begin
OS.File.Read (File.File, Buffer, Length);
File.EOF := (Length <= 0);
end OS_Read_File;
procedure Read (File: in out File_Record;
Buffer: in out Slim_String;
Last: out System_Length) is
Length: out System_Length) is
pragma Assert (Buffer'Length > 0);
Outbuf: System_Byte_Array (Buffer'Range);
for Outbuf'Address use Buffer'Address;
Rbuf: File_Buffer renames File.Rbuf;
L1, L2: System_Length;
begin
null;
if Rbuf.Length <= 0 and then File.EOF then
-- raise EOF EXCEPTION. ???
Length := 0;
return;
end if;
if Outbuf'Length >= Rbuf.Data'Length then
-- The output buffer size if greater than the internal buffer size.
L1 := Rbuf.Length;
if L1 < Outbuf'Length then
-- Read into the tail of the output buffer if insufficient
-- data is available in the internal buffer.
OS_Read_File (File, Outbuf(Outbuf'First + L1 .. Outbuf'Last), L2);
end if;
-- Fill the head of the output buffer with the internal buffer contents
Outbuf(Outbuf'First .. Outbuf'First + L1 - 1) := Rbuf.Data(Rbuf.Data'First .. Rbuf.Data'First + L1 - 1);
-- Empty the internal buffer.
Rbuf.Length := 0;
-- Set the output length
Length := L1 + L2;
else
if Rbuf.Length < Rbuf.Data'Length then
-- Attempt to fill the internal buffer. It may not get full with a single read.
OS_Read_File (File, Rbuf.Data(Rbuf.Data'First + Rbuf.Length .. Rbuf.Data'Last), L1);
Rbuf.Length := RBuf.Length + L1;
end if;
-- Determine how much need to be copied to the output buffer.
If Outbuf'Length < Rbuf.Length then
L2 := Outbuf'Length;
else
L2 := Rbuf.Length;
end if;
-- Copy the head of the internal buffer to the output buffer
Outbuf(Outbuf'First .. Outbuf'First + L2 - 1) := Rbuf.Data(Rbuf.Data'First .. Rbuf.Data'First + L2 - 1);
-- Move the residue of the internal buffer to the head
Rbuf.Length := Rbuf.Length - L2;
Rbuf.Data(Rbuf.Data'First .. Rbuf.Data'First + Rbuf.Length - 1) := Rbuf.Data(Rbuf.Data'First + L2 .. Rbuf.Data'First + L2 + Rbuf.Length - 1);
-- Set the output length
Length := L2;
end if;
end Read;
procedure Read (File: in out File_Record;
Buffer: in out Wide_String;
Last: out System_Length) is
Length: out System_Length) is
pragma Assert (Buffer'Length > 0);
Outbuf: Wide_String renames Buffer;
Rbuf: File_Buffer renames File.Rbuf;
Inbuf: Slim_String (Rbuf.Data'Range);
for Inbuf'Address use Rbuf.Data'Address;
L1, L2, L3, I, J, K: System_Length;
begin
if Rbuf.Length <= 0 and then File.EOF then
-- raise EOF EXCEPTION. ???
Length := 0;
return;
end if;
K := Outbuf'First - 1;
outer: loop
if Rbuf.Length < Rbuf.Data'Length then
-- Attempt to fill the internal buffer. It may not get full with a single read.
OS_Read_File (File, Rbuf.Data(Rbuf.Data'First + Rbuf.Length .. Rbuf.Data'Last), L1);
File.EOF := (L1 <= 0);
Rbuf.Length := Rbuf.Length + L1;
end if;
if Rbuf.Length <= 0 then
exit outer;
end if;
L2 := Rbuf.Data'First + Rbuf.Length - 1; -- Last index of the internal buffer
I := Rbuf.Data'First;
loop
L3 := Sequence_Length (Inbuf(I));
if L2 - I + 1 < L3 then
exit;
end if;
K := K + 1;
J := I + L3;
Outbuf(K..K) := Slim_To_Wide(Inbuf(I .. J - 1));
I := J;
--if K >= Outbuf'Last or else Outbuf(K) = Ascii.Pos.LF then -- TODO: different line terminator
-- L1 := I - Rbuf.Data'First + 1; -- Length of data copied to the output buffer.
-- Rbuf.Length := Rbuf.Length - L1; -- Residue length
-- Rbuf.Data(Rbuf.Data'First .. RBuf.Data'First + Rbuf.Length - 1) := Rbuf.Data(I + 1 .. L2); -- Copy residue
-- exit outer; -- Done
--end if;
end loop;
-- Empty the internal buffer;
Rbuf.Length := 0;
end loop outer;
Length := K + 1 - Outbuf'First;
end Read;
procedure Read_Line (File: in out File_Record;
Buffer: in out Slim_String;
Length: out System_Length) is
pragma Assert (Buffer'Length > 0);
Outbuf: System_Byte_Array (Buffer'Range);
for Outbuf'Address use Buffer'Address;
Rbuf: File_Buffer renames File.Rbuf;
L1, L2, K: System_Length;
package Ascii is new H2.Ascii (Slim_Character);
begin
-- Unlike Read, this procedure should use the internal buffer
-- regardless of the output buffer size as the position of
-- the line terminator is unknown.
--
-- If the buffer is not large enough to hold a line, the output
-- is just truncated truncated to the buffer size.
if Rbuf.Length <= 0 and then File.EOF then
-- raise EOF EXCEPTION. ???
Length := 0;
return;
end if;
K := Outbuf'First - 1;
outer: loop
if Rbuf.Length < Rbuf.Data'Length then
-- Attempt to fill the internal buffer. It may not get full with a single read.
OS_Read_File (File, Rbuf.Data(Rbuf.Data'First + Rbuf.Length .. Rbuf.Data'Last), L1);
File.EOF := (L1 <= 0);
Rbuf.Length := Rbuf.Length + L1;
end if;
if Rbuf.Length <= 0 then
exit outer;
end if;
L2 := Rbuf.Data'First + Rbuf.Length - 1; -- Last index of the internal buffer
for I in Rbuf.Data'First .. L2 loop
K := K + 1;
Outbuf(K) := Rbuf.Data(I);
if K >= Outbuf'Last or else Outbuf(K) = Ascii.Pos.LF then -- TODO: different line terminator
L1 := I - Rbuf.Data'First + 1; -- Length of data copied to the output buffer.
Rbuf.Length := Rbuf.Length - L1; -- Residue length
Rbuf.Data(Rbuf.Data'First .. RBuf.Data'First + Rbuf.Length - 1) := Rbuf.Data(I + 1 .. L2); -- Copy residue
exit outer; -- Done
end if;
end loop;
-- Empty the internal buffer;
Rbuf.Length := 0;
end loop outer;
Length := K + 1 - Outbuf'First;
end Read_Line;
procedure Read_Line (File: in out File_Record;
Buffer: in out Wide_String;
Length: out System_Length) is
begin
null;
end Read;
end Read_Line;
procedure Write (File: in out File_Record;
Buffer: in Slim_String;
Last: out System_Length) is
Length: out System_Length) is
begin
null;
end Write;
procedure Write (File: in out File_Record;
Buffer: in Wide_String;
Last: out System_Length) is
Length: out System_Length) is
begin
null;
end Write;