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ZIPUTILS.PAS
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Pascal/Delphi Source File
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2000-05-01
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7KB
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334 lines
Unit ziputils;
{ ziputils.pas - IO on .zip files using zlib
- definitions, declarations and routines used by both
zip.pas and unzip.pas
The file IO is implemented here.
based on work by Gilles Vollant
March 23th, 2000,
Copyright (C) 2000 Jacques Nomssi Nzali }
interface
{$undef UseStream}
{$ifdef WIN32}
{$define Delphi}
{$ifdef UseStream}
{$define Streams}
{$endif}
{$endif}
uses
{$ifdef Delphi}
classes, SysUtils,
{$endif}
zutil;
{ -------------------------------------------------------------- }
{$ifdef Streams}
type
FILEptr = TFileStream;
{$else}
type
FILEptr = ^file;
{$endif}
type
seek_mode = (SEEK_SET, SEEK_CUR, SEEK_END);
open_mode = (fopenread, fopenwrite, fappendwrite);
function fopen(filename : PChar; mode : open_mode) : FILEptr;
procedure fclose(fp : FILEptr);
function fseek(fp : FILEptr; recPos : uInt; mode : seek_mode) : int;
function fread(buf : voidp; recSize : uInt;
recCount : uInt; fp : FILEptr) : uInt;
function fwrite(buf : voidp; recSize : uInt;
recCount : uInt; fp : FILEptr) : uInt;
function ftell(fp : FILEptr) : uInt; { ZIP }
function feof(fp : FILEptr) : uInt; { MiniZIP }
{ ------------------------------------------------------------------- }
type
zipFile = voidp;
unzFile = voidp;
type
z_off_t = long;
{ tm_zip contain date/time info }
type
tm_zip = record
tm_sec : uInt; { seconds after the minute - [0,59] }
tm_min : uInt; { minutes after the hour - [0,59] }
tm_hour : uInt; { hours since midnight - [0,23] }
tm_mday : uInt; { day of the month - [1,31] }
tm_mon : uInt; { months since January - [0,11] }
tm_year : uInt; { years - [1980..2044] }
end;
tm_unz = tm_zip;
const
Z_BUFSIZE = (16384);
Z_MAXFILENAMEINZIP = (256);
const
CENTRALHEADERMAGIC = $02014b50;
const
SIZECENTRALDIRITEM = $2e;
SIZEZIPLOCALHEADER = $1e;
function ALLOC(size : int) : voidp;
procedure TRYFREE(p : voidp);
const
Paszip_copyright : PChar = ' Paszip Copyright 2000 Jacques Nomssi Nzali ';
implementation
function ALLOC(size : int) : voidp;
begin
ALLOC := zcalloc (NIL, size, 1);
end;
procedure TRYFREE(p : voidp);
begin
if Assigned(p) then
zcfree(NIL, p);
end;
{$ifdef Streams}
{ ---------------------------------------------------------------- }
function fopen(filename : PChar; mode : open_mode) : FILEptr;
var
fp : FILEptr;
begin
fp := NIL;
try
Case mode of
fopenread: fp := TFileStream.Create(filename, fmOpenRead);
fopenwrite: fp := TFileStream.Create(filename, fmCreate);
fappendwrite :
begin
fp := TFileStream.Create(filename, fmOpenReadWrite);
fp.Seek(soFromEnd, 0);
end;
end;
except
on EFOpenError do
fp := NIL;
end;
fopen := fp;
end;
procedure fclose(fp : FILEptr);
begin
fp.Free;
end;
function fread(buf : voidp;
recSize : uInt;
recCount : uInt;
fp : FILEptr) : uInt;
var
totalSize, readcount : uInt;
begin
if Assigned(buf) then
begin
totalSize := recCount * uInt(recSize);
readCount := fp.Read(buf^, totalSize);
if (readcount <> totalSize) then
fread := readcount div recSize
else
fread := recCount;
end
else
fread := 0;
end;
function fwrite(buf : voidp;
recSize : uInt;
recCount : uInt;
fp : FILEptr) : uInt;
var
totalSize, written : uInt;
begin
if Assigned(buf) then
begin
totalSize := recCount * uInt(recSize);
written := fp.Write(buf^, totalSize);
if (written <> totalSize) then
fwrite := written div recSize
else
fwrite := recCount;
end
else
fwrite := 0;
end;
function fseek(fp : FILEptr;
recPos : uInt;
mode : seek_mode) : int;
const
fsmode : array[seek_mode] of Word
= (soFromBeginning, soFromCurrent, soFromEnd);
begin
fp.Seek(recPos, fsmode[mode]);
fseek := 0; { = 0 for success }
end;
function ftell(fp : FILEptr) : uInt;
begin
ftell := fp.Position;
end;
function feof(fp : FILEptr) : uInt;
begin
feof := 0;
if Assigned(fp) then
if fp.Position = fp.Size then
feof := 1
else
feof := 0;
end;
{$else}
{ ---------------------------------------------------------------- }
function fopen(filename : PChar; mode : open_mode) : FILEptr;
var
fp : FILEptr;
OldFileMode : byte;
begin
fp := NIL;
OldFileMode := FileMode;
GetMem(fp, SizeOf(file));
Assign(fp^, filename);
{$i-}
Case mode of
fopenread:
begin
FileMode := 0;
Reset(fp^, 1);
end;
fopenwrite:
begin
FileMode := 1;
ReWrite(fp^, 1);
end;
fappendwrite :
begin
FileMode := 2;
Reset(fp^, 1);
Seek(fp^, FileSize(fp^));
end;
end;
FileMode := OldFileMode;
if IOresult<>0 then
begin
FreeMem(fp, SizeOf(file));
fp := NIL;
end;
fopen := fp;
end;
procedure fclose(fp : FILEptr);
begin
if Assigned(fp) then
begin
{$i-}
system.close(fp^);
if IOresult=0 then;
FreeMem(fp, SizeOf(file));
end;
end;
function fread(buf : voidp;
recSize : uInt;
recCount : uInt;
fp : FILEptr) : uInt;
var
totalSize, readcount : uInt;
begin
if Assigned(buf) then
begin
totalSize := recCount * uInt(recSize);
{$i-}
system.BlockRead(fp^, buf^, totalSize, readcount);
if (readcount <> totalSize) then
fread := readcount div recSize
else
fread := recCount;
end
else
fread := 0;
end;
function fwrite(buf : voidp;
recSize : uInt;
recCount : uInt;
fp : FILEptr) : uInt;
var
totalSize, written : uInt;
begin
if Assigned(buf) then
begin
totalSize := recCount * uInt(recSize);
{$i-}
system.BlockWrite(fp^, buf^, totalSize, written);
if (written <> totalSize) then
fwrite := written div recSize
else
fwrite := recCount;
end
else
fwrite := 0;
end;
function fseek(fp : FILEptr;
recPos : uInt;
mode : seek_mode) : int;
begin
{$i-}
case mode of
SEEK_SET : system.Seek(fp^, recPos);
{$WARNINGS OFF}
SEEK_CUR : system.Seek(fp^, FilePos(fp^)+recPos);
SEEK_END : system.Seek(fp^, FileSize(fp^)-1-recPos); { ?? check }
{$WARNINGS ON}
end;
fseek := IOresult; { = 0 for success }
end;
function ftell(fp : FILEptr) : uInt;
begin
ftell := FilePos(fp^);
end;
function feof(fp : FILEptr) : uInt;
begin
feof := 0;
if Assigned(fp) then
if eof(fp^) then
feof := 1
else
feof := 0;
end;
{$endif}
{ ---------------------------------------------------------------- }
end.