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* Added Classes version of BZip2 Stream

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git-svn-id: trunk@13430 -
This commit is contained in:
michael 2009-07-23 15:52:29 +00:00
parent aba66582a8
commit 5b58c9aea6
7 changed files with 855 additions and 121 deletions
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3
.gitattributes vendored
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@ -927,7 +927,10 @@ packages/bzip2/Makefile.fpc svneol=native#text/plain
packages/bzip2/examples/pasbzip.pas svneol=native#text/plain
packages/bzip2/fpmake.pp svneol=native#text/plain
packages/bzip2/src/bzip2.pas svneol=native#text/plain
packages/bzip2/src/bzip2comn.pp svneol=native#text/plain
packages/bzip2/src/bzip2i386.inc svneol=native#text/plain
packages/bzip2/src/bzip2si386.inc svneol=native#text/plain
packages/bzip2/src/bzip2stream.pp svneol=native#text/plain
packages/cairo/Makefile svneol=native#text/plain
packages/cairo/Makefile.fpc svneol=native#text/plain
packages/cairo/fpmake.pp svneol=native#text/plain

132
packages/bzip2/Makefile
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@ -1,5 +1,5 @@
#
# Don't edit, this file is generated by FPCMake Version 2.0.0 [2008/10/22]
# Don't edit, this file is generated by FPCMake Version 2.0.0 [2009/06/27]
#
default: all
MAKEFILETARGETS=i386-linux i386-go32v2 i386-win32 i386-os2 i386-freebsd i386-beos i386-haiku i386-netbsd i386-solaris i386-qnx i386-netware i386-openbsd i386-wdosx i386-darwin i386-emx i386-watcom i386-netwlibc i386-wince i386-embedded i386-symbian m68k-linux m68k-freebsd m68k-netbsd m68k-amiga m68k-atari m68k-openbsd m68k-palmos m68k-embedded powerpc-linux powerpc-netbsd powerpc-amiga powerpc-macos powerpc-darwin powerpc-morphos powerpc-embedded sparc-linux sparc-netbsd sparc-solaris sparc-embedded x86_64-linux x86_64-freebsd x86_64-darwin x86_64-win64 x86_64-embedded arm-linux arm-palmos arm-darwin arm-wince arm-gba arm-nds arm-embedded arm-symbian powerpc64-linux powerpc64-darwin powerpc64-embedded avr-embedded armeb-linux armeb-embedded
@ -265,178 +265,178 @@ PACKAGESDIR:=$(wildcard $(FPCDIR) $(FPCDIR)/packages $(FPCDIR)/packages/base $(F
override PACKAGE_NAME=bzip2
override PACKAGE_VERSION=2.2.2
ifeq ($(FULL_TARGET),i386-linux)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-go32v2)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-win32)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-os2)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-freebsd)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-beos)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-haiku)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-netbsd)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-solaris)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-qnx)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-netware)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-openbsd)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-wdosx)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-darwin)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-emx)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-watcom)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-netwlibc)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-wince)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-embedded)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),i386-symbian)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),m68k-linux)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),m68k-freebsd)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),m68k-netbsd)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),m68k-amiga)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),m68k-atari)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),m68k-openbsd)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),m68k-palmos)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),m68k-embedded)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),powerpc-linux)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),powerpc-netbsd)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),powerpc-amiga)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),powerpc-macos)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),powerpc-darwin)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),powerpc-morphos)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),powerpc-embedded)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),sparc-linux)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),sparc-netbsd)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),sparc-solaris)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),sparc-embedded)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),x86_64-linux)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),x86_64-freebsd)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),x86_64-darwin)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),x86_64-win64)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),x86_64-embedded)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),arm-linux)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),arm-palmos)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),arm-darwin)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),arm-wince)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),arm-gba)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),arm-nds)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),arm-embedded)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),arm-symbian)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),powerpc64-linux)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),powerpc64-darwin)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),powerpc64-embedded)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),avr-embedded)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),armeb-linux)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
ifeq ($(FULL_TARGET),armeb-embedded)
override TARGET_UNITS+=bzip2
override TARGET_UNITS+=bzip2comn bzip2 bzip2stream
endif
override INSTALL_FPCPACKAGE=y
ifeq ($(FULL_TARGET),i386-linux)
@ -1007,6 +1007,7 @@ endif
ifeq ($(OS_TARGET),go32v2)
STATICLIBPREFIX=
SHORTSUFFIX=dos
IMPORTLIBPREFIX=
endif
ifeq ($(OS_TARGET),watcom)
STATICLIBPREFIX=
@ -1014,6 +1015,7 @@ OEXT=.obj
ASMEXT=.asm
SHAREDLIBEXT=.dll
SHORTSUFFIX=wat
IMPORTLIBPREFIX=
endif
ifeq ($(OS_TARGET),linux)
BATCHEXT=.sh
@ -1050,6 +1052,7 @@ STATICLIBPREFIX=
SHAREDLIBEXT=.dll
SHORTSUFFIX=os2
ECHO=echo
IMPORTLIBPREFIX=
endif
ifeq ($(OS_TARGET),emx)
BATCHEXT=.cmd
@ -1058,6 +1061,7 @@ STATICLIBPREFIX=
SHAREDLIBEXT=.dll
SHORTSUFFIX=emx
ECHO=echo
IMPORTLIBPREFIX=
endif
ifeq ($(OS_TARGET),amiga)
EXEEXT=
@ -1097,17 +1101,20 @@ ifeq ($(OS_TARGET),netware)
EXEEXT=.nlm
STATICLIBPREFIX=
SHORTSUFFIX=nw
IMPORTLIBPREFIX=imp
endif
ifeq ($(OS_TARGET),netwlibc)
EXEEXT=.nlm
STATICLIBPREFIX=
SHORTSUFFIX=nwl
IMPORTLIBPREFIX=imp
endif
ifeq ($(OS_TARGET),macos)
BATCHEXT=
EXEEXT=
DEBUGSYMEXT=.xcoff
SHORTSUFFIX=mac
IMPORTLIBPREFIX=imp
endif
ifeq ($(OS_TARGET),darwin)
BATCHEXT=.sh
@ -1134,14 +1141,17 @@ STATICLIBEXT=.a1
SHAREDLIBEXT=.so1
STATICLIBPREFIX=
SHORTSUFFIX=v1
IMPORTLIBPREFIX=
endif
ifeq ($(OS_TARGET),go32v2)
STATICLIBPREFIX=
SHORTSUFFIX=dos
IMPORTLIBPREFIX=
endif
ifeq ($(OS_TARGET),watcom)
STATICLIBPREFIX=
SHORTSUFFIX=wat
IMPORTLIBPREFIX=
endif
ifeq ($(OS_TARGET),linux)
BATCHEXT=.sh
@ -1188,6 +1198,7 @@ STATICLIBEXT=.ao2
SHAREDLIBEXT=.dll
SHORTSUFFIX=os2
ECHO=echo
IMPORTLIBPREFIX=
endif
ifeq ($(OS_TARGET),amiga)
EXEEXT=
@ -1248,6 +1259,7 @@ STATICLIBEXT=.a
SHAREDLIBEXT=.nlm
EXEEXT=.nlm
SHORTSUFFIX=nw
IMPORTLIBPREFIX=imp
endif
ifeq ($(OS_TARGET),netwlibc)
STATICLIBPREFIX=
@ -1259,6 +1271,7 @@ STATICLIBEXT=.a
SHAREDLIBEXT=.nlm
EXEEXT=.nlm
SHORTSUFFIX=nwl
IMPORTLIBPREFIX=imp
endif
ifeq ($(OS_TARGET),macos)
BATCHEXT=
@ -1270,6 +1283,7 @@ STATICLIBEXT=.a
EXEEXT=
DEBUGSYMEXT=.xcoff
SHORTSUFFIX=mac
IMPORTLIBPREFIX=imp
endif
endif
ifneq ($(findstring $(OS_SOURCE),$(LIMIT83fs)),)

2
packages/bzip2/Makefile.fpc
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@ -7,7 +7,7 @@ name=bzip2
version=2.2.2
[target]
units=bzip2
units=bzip2comn bzip2 bzip2stream
[require]
package=rtl

63
packages/bzip2/src/bzip2.pas
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@ -26,25 +26,9 @@ interface
{$goto on}
uses objects;
const max_groups=6;
max_alpha_size=258;
max_code_len=23;
group_size=50;
iter_count=4;
max_selectors=2+(900000 div group_size);
const mtfa_size=4096;
mtfl_size=16;
type Tcardinal_array=array [0..899999] of cardinal;
Pcardinal_array=^Tcardinal_array;
Pcardinal=^cardinal;
Thuffarray=array[0..max_alpha_size] of cardinal;
Phuffarray=^Thuffarray;
uses objects, bzip2comn;
Type
Tbzip2_decode_stream=object(Tstream)
short:cardinal;
readstream:Pstream;
@ -100,14 +84,6 @@ type Tcardinal_array=array [0..899999] of cardinal;
destructor done;virtual;
end;
{A bzip2 stream starts with this:}
const bzip2_stream_magic='BZh';
{Error codes for stream errorinfo.}
const bzip2_bad_header_magic =1;
bzip2_bad_block_magic =2;
bzip2_endoffile =3;
bzip2_data_error =4;
implementation
@ -115,41 +91,6 @@ implementation
{$i bzip2i386.inc}
{$endif}
procedure hb_create_decode_tables(var limit,base,perm:array of cardinal;
var length:array of byte;
minlen,maxlen:byte;alphasize:cardinal);
var pp,i,j,vec:cardinal;
begin
pp:=0;
for i:=minlen to maxlen do
for j:=0 to alphasize-1 do
if length[j]=i then
begin
perm[pp]:=j;
inc(pp);
end;
for i:=0 to max_code_len-1 do
begin
base[i]:=0;
limit[i]:=0;
end;
for i:=0 to alphasize-1 do
inc(base[length[i]+1]);
for i:=1 to max_code_len-1 do
inc(base[i],base[i-1]);
vec:=0;
for i:=minlen to maxlen do
begin
inc(vec,base[i+1]-base[i]);
limit[i]:=vec-1;
vec:=vec shl 1;
end;
for i:=minlen+1 to maxlen do
base[i]:=((limit[i-1]+1) shl 1)-base[i];
end;
{*****************************************************************************
Tbzip2_decode_stream
*****************************************************************************}

76
packages/bzip2/src/bzip2comn.pp Normal file
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@ -0,0 +1,76 @@
unit bzip2comn;
interface
const
max_groups = 6;
max_alpha_size = 258;
max_code_len = 23;
group_size = 50;
iter_count = 4;
max_selectors = 2+(900000 div group_size);
mtfa_size = 4096;
mtfl_size = 16;
type
TCardinal_array = array [0..899999] of Cardinal;
PCardinal_array = ^TCardinal_array;
PCardinal = ^Cardinal;
Thuffarray = array[0..max_alpha_size] of Cardinal;
Phuffarray = ^Thuffarray;
{A bzip2 stream starts with this:}
const bzip2_stream_magic='BZh';
{Error codes for stream errorinfo.}
const
bzip2_bad_header_magic = 1;
bzip2_bad_block_magic = 2;
bzip2_endoffile = 3;
bzip2_data_error = 4;
procedure hb_create_decode_tables(var limit,base,perm:array of cardinal;
var length:array of byte;
minlen,maxlen:byte;alphasize:cardinal);
implementation
procedure hb_create_decode_tables(var limit,base,perm:array of cardinal;
var length:array of byte;
minlen,maxlen:byte;alphasize:cardinal);
var pp,i,j,vec:cardinal;
begin
pp:=0;
for i:=minlen to maxlen do
for j:=0 to alphasize-1 do
if length[j]=i then
begin
perm[pp]:=j;
inc(pp);
end;
for i:=0 to max_code_len-1 do
begin
base[i]:=0;
limit[i]:=0;
end;
for i:=0 to alphasize-1 do
inc(base[length[i]+1]);
for i:=1 to max_code_len-1 do
inc(base[i],base[i-1]);
vec:=0;
for i:=minlen to maxlen do
begin
inc(vec,base[i+1]-base[i]);
limit[i]:=vec-1;
vec:=vec shl 1;
end;
for i:=minlen+1 to maxlen do
base[i]:=((limit[i-1]+1) shl 1)-base[i];
end;
end.

31
packages/bzip2/src/bzip2si386.inc Normal file
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@ -0,0 +1,31 @@
{$ASMMODE intel}
{$define HAVE_DETRANSFORM}
procedure TDecompressBzip2Stream.detransform;assembler;
asm
{ mov edx,offset c
call mcount}
xor edx,edx
lea ebx,[esi+TDecompressBzip2Stream.cftab]
mov ecx,[esi+TDecompressBzip2Stream.tt_count]
push esi
push ebp
mov esi,[esi+TDecompressBzip2Stream.tt]
mov edi,esi
lea ebp,[4*ecx+esi]
jmp @a2
@a1:
movzx eax,byte [esi]
mov ecx,[ebx+4*eax]
inc dword [ebx+4*eax]
or [edi+4*ecx],edx
add edx,$100
add esi,4
@a2:
cmp esi,ebp
jne @a1
pop ebp
pop esi
end ['eax','ebx','ecx','edx','edi'];

669
packages/bzip2/src/bzip2stream.pp Normal file
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@ -0,0 +1,669 @@
{$mode objfpc}
{$h+}
unit bzip2stream;
{****************************************************************************
BZIP2 decompression unit
Copyright (C) 2002 by Daniel Mantione
Class port (C) 2009 by Michael Van Canneyt
This unit provides a decompression stream to decode .bz2 files. It is
inpired by Julian R. Seward's libbzip2 library and therefore you should
send credits to him and bug reports to me :)
This code is licensed under the same terms as the original libbz2 library,
which is decsribed in the file LICENSE. If you don't have this file, look
at http://www.freepascal.org for this bzip2 unit, the LICENSE file will
be included. In case of problems, contact the author.
E-mail addresses:
Michael Van Canneyt <michael@freepascal.org>
Daniel Mantione <daniel.mantione@freepascal.org>
Julian R. Seward <jseward@acm.org>
Please do not contact Julian about this Pascal library, he didn't wrote it.
****************************************************************************}
interface
{$goto on}
uses Classes,SysUtils, bzip2comn;
Type
TDecompressBzip2Stream=Class(TOwnerStream)
Private
block_randomized:boolean;
blocksize:byte;
tt:Pcardinal_array;
tt_count:cardinal;
rle_run_left,rle_run_data:byte;
nextrle:Pbyte;
decode_available:cardinal;
block_origin:cardinal;
current_block:cardinal;
read_data,bits_available:byte;
inuse16:set of 0..15;
inuse:set of 0..255;
inuse_count:cardinal;
seq_to_unseq:array[0..255] of byte;
alphasize:cardinal;
group_count,group_pos,gsel,gminlen:byte;
group_no:cardinal;
glimit,gperm,gbase:Phuffarray;
selector_count:cardinal;
selector,selector_mtf:array[0..max_selectors] of byte;
len:array[0..max_groups,0..max_alpha_size] of byte;
limit:array[0..max_groups,0..max_alpha_size] of cardinal;
base:array[0..max_groups,0..max_alpha_size] of cardinal;
perm:array[0..max_groups,0..max_alpha_size] of cardinal;
minlens:array[0..max_groups] of byte;
cftab:array[0..257] of cardinal;
mtfbase:array[0..256 div mtfl_size-1] of cardinal;
mtfa:array[0..mtfa_size-1] of byte;
function get_bits(n:byte):byte;
function get_boolean:boolean;
function get_byte:byte;
function get_cardinal24:cardinal;
function get_cardinal:cardinal;
procedure receive_mapping_table;
procedure receive_selectors;
procedure undo_mtf_values;
procedure receive_coding_tables;
procedure make_hufftab;
procedure init_mtf;
function get_mtf_value:cardinal;
procedure move_mtf_block;
procedure receive_mtf_values;
procedure detransform;
function decode_block : boolean;
Function new_block : boolean;
Function consume_rle : Boolean; inline;
Function rle_read(bufptr:Pbyte;count:Longint) : longint;
Procedure Error(Msg : String; ACode : Integer);
Public
Constructor Create(ASource : TStream);
Destructor Destroy; override;
function Read(var Buffer; Count: Longint): Longint; override;
end;
EBzip2 = Class(Exception)
ErrCode : Integer;
end;
implementation
{$ifdef i386}
{$i bzip2si386.inc}
{$endif}
{*****************************************************************************
TDecompressBzip2Stream
*****************************************************************************}
Resourcestring
BZip2Initialize = 'Invalid BZip2 stream: invalid header';
SDecodingError = 'Decoding error';
SErrUnimplemented = 'Feature not implemented';
Constructor TDecompressBzip2Stream.Create(ASource: TStream);
var magic:array[1..3] of char;
c:char;
begin
Inherited Create(ASource);
{Read the magic.}
Source.ReadBuffer(magic,sizeof(magic));
if magic<>bzip2_stream_magic then
Error(BZip2Initialize,bzip2_bad_header_magic);
{Read the block size and allocate the working array.}
Source.ReadBuffer(c,1);
blocksize:=byte(c)-byte('0');
GetMem(tt,blocksize*100000*sizeof(cardinal));
decode_available:=high(decode_available);
end;
Procedure TDecompressBzip2Stream.Error(Msg : String; ACode : Integer);
Var
BE : EBzip2;
begin
BE:=EBzip2.Create(Msg);
BE.ErrCode:=ACode;
Raise BE;
end;
function TDecompressBzip2Stream.get_bits(n:byte):byte;
var data:byte;
begin
if n>bits_available then
begin
Source.ReadBuffer(data,1);
get_bits:=(read_data shr (8-n)) or data shr (8-(n-bits_available));
read_data:=data shl (n-bits_available);
inc(bits_available,8);
end
else
begin
get_bits:=read_data shr (8-n);
read_data:=read_data shl n;
end;
dec(bits_available,n);
end;
function TDecompressBzip2Stream.get_boolean:boolean;
begin
get_boolean:=boolean(get_bits(1));
end;
function TDecompressBzip2Stream.get_byte:byte;
begin
get_byte:=get_bits(8);
end;
function TDecompressBzip2Stream.get_cardinal24:cardinal;
begin
get_cardinal24:=get_bits(8) shl 16 or get_bits(8) shl 8 or get_bits(8);
end;
function TDecompressBzip2Stream.get_cardinal:cardinal;
begin
get_cardinal:=get_bits(8) shl 24 or get_bits(8) shl 16 or get_bits(8) shl 8 or
get_bits(8);
end;
procedure TDecompressBzip2Stream.receive_mapping_table;
{Receive the mapping table. To save space, the inuse set is stored in pieces
of 16 bits. First 16 bits are stored which pieces of 16 bits are used, then
the pieces follow.}
var i,j:byte;
begin
inuse16:=[];
{Receive the first 16 bits which tell which pieces are stored.}
for i:=0 to 15 do
if get_boolean then
include(inuse16,i);
{Receive the used pieces.}
inuse:=[];
inuse_count:=0;
for i:=0 to 15 do
if i in inuse16 then
for j:=0 to 15 do
if get_boolean then
begin
include(inuse,16*i+j);
seq_to_unseq[inuse_count]:=16*i+j;
inc(inuse_count);
end;
{ system.write('Mapping table: ');
for i:=0 to 255 do
if i in inuse then
system.write(i,' ');
writeln;}
end;
procedure TDecompressBzip2Stream.receive_selectors;
{Receives the selectors.}
var i:cardinal;
j:byte;
begin
group_count:=get_bits(3);
selector_count:=get_bits(8) shl 7 or get_bits(7);
for i:=0 to selector_count-1 do
begin
j:=0;
while get_boolean do
begin
inc(j);
if j>5 then
error(SDecodingError,bzip2_data_error);
end;
selector_mtf[i]:=j;
end;
{ system.write('Selector_mtf: ');
for i:=0 to selector_count-1 do
system.write(selector_mtf[i],' ');
writeln;}
end;
procedure TDecompressBzip2Stream.undo_mtf_values;
{Undo the MTF values for the selectors.}
var pos:array[0..max_groups] of byte;
i:cardinal;
v,tmp:byte;
begin
for v:=0 to group_count-1 do
pos[v]:=v;
for i:=0 to selector_count-1 do
begin
v:=selector_mtf[i];
tmp:=pos[v];
while v<>0 do
begin
pos[v]:=pos[v-1];
dec(v);
end;
pos[0]:=tmp;
selector[i]:=tmp;
end;
end;
procedure TDecompressBzip2Stream.receive_coding_tables;
var t,curr:byte;
i:cardinal;
begin
for t:=0 to group_count-1 do
begin
curr:=get_bits(5);
for i:=0 to alphasize-1 do
begin
repeat
if not(curr in [1..20]) then
error(SDecodingError,bzip2_data_error);
if not get_boolean then
break;
if get_boolean then
dec(curr)
else
inc(curr);
until false;
len[t,i]:=curr;
end;
end;
end;
procedure TDecompressBzip2Stream.make_hufftab;
{Builds the Huffman tables.}
var i:cardinal;
t,minlen,maxlen:byte;
begin
for t:=0 to group_count-1 do
begin
minlen:=32;
maxlen:=0;
for i:=0 to alphasize-1 do
begin
if len[t,i]>maxlen then
maxlen:=len[t,i];
if len[t,i]<minlen then
minlen:=len[t,i];
end;
hb_create_decode_tables(limit[t],base[t],perm[t],len[t],
minlen,maxlen,alphasize);
minlens[t]:=minlen;
end;
end;
procedure TDecompressBzip2Stream.init_mtf;
var i,j:byte;
k:cardinal;
begin
k:=mtfa_size-1;
for i:=256 div mtfl_size-1 downto 0 do
begin
for j:=mtfl_size-1 downto 0 do
begin
mtfa[k]:=i*mtfl_size+j;
dec(k);
end;
mtfbase[i]:=k+1;
end;
end;
function TDecompressBzip2Stream.get_mtf_value:cardinal;
var zn:byte;
zvec:cardinal;
begin
if group_pos=0 then
begin
inc(group_no);
group_pos:=group_size;
gsel:=selector[group_no];
gminlen:=minlens[gsel];
glimit:=@limit[gsel];
gperm:=@perm[gsel];
gbase:=@base[gsel];
end;
dec(group_pos);
zn:=gminlen;
zvec:=get_bits(zn);
while zvec>glimit^[zn] do
begin
inc(zn);
zvec:=zvec shl 1 or byte(get_boolean);
end;
get_mtf_value:=gperm^[zvec-gbase^[zn]];
end;
procedure TDecompressBzip2Stream.move_mtf_block;
var i:byte;
j,k:cardinal;
begin
k:=MTFA_SIZE;
for i:=256 div MTFL_SIZE-1 downto 0 do
begin
j:=mtfbase[i];
Pcardinal(@mtfa[k- 4])^:=Pcardinal(@mtfa[j+12])^;
Pcardinal(@mtfa[k- 8])^:=Pcardinal(@mtfa[j+ 8])^;
Pcardinal(@mtfa[k-12])^:=Pcardinal(@mtfa[j+ 4])^;
dec(k,16);
Pcardinal(@mtfa[k ])^:=Pcardinal(@mtfa[j ])^;
mtfbase[i]:=k;
end;
end;
procedure TDecompressBzip2Stream.receive_mtf_values;
const run_a=0;
run_b=1;
var t,next_sym:cardinal;
es:cardinal;
n:byte;
nn,i:cardinal;
p,q:Pbyte;
u,v:Pcardinal;
lno,off:cardinal;
begin
group_no:=high(group_no);
group_pos:=0;
t:=0;
for i:=0 to 257 do
cftab[i]:=0;
init_mtf;
next_sym:=get_mtf_value;
while next_sym<>inuse_count+1 do
begin
{ writeln(t,' ',next_sym);
if t=22296 then
t:=t; }
if next_sym<=run_b then
begin
es:=0;
n:=0;
repeat
inc(es,(next_sym+1) shl n);
inc(n);
next_sym:=get_mtf_value;
until next_sym>run_b;
n:=seq_to_unseq[mtfa[mtfbase[0]]];
inc(cftab[n],es);
if t+es>100000*blocksize then
error(SDecodingError,bzip2_data_error);
while es>0 do
begin
tt^[t]:=n;
dec(es);
inc(t);
end;
end
else
begin
nn:=next_sym-1;
if nn<mtfl_size then
begin
{Avoid the costs of the general case.}
p:=@mtfa[mtfbase[0]];
q:=p+nn;
n:=q^;
repeat
q^:=(q-1)^;
dec(q);
until q=p;
q^:=n;
end
else
begin
{General case.}
lno:=nn div MTFL_SIZE;
off:=nn and (MTFL_SIZE-1);
p:=@mtfa[mtfbase[lno]];
q:=p+off;
n:=q^;
while(q<>p) do
begin
q^:=(q-1)^;
dec(q);
end;
u:=@mtfbase;
v:=u+lno;
repeat
mtfa[v^]:=mtfa[(v-1)^+MTFL_SIZE-1];
dec(v);
dec(v^);
until v=u;
mtfa[v^]:=n;
if v^=0 then
move_mtf_block;
end;
inc(cftab[seq_to_unseq[n]]);
tt^[t]:=cardinal(seq_to_unseq[n]);
inc(t);
if t>100000*blocksize then
error(SDecodingError,bzip2_data_error);
next_sym:=get_mtf_value;
end;
end;
tt_count:=t;
{Setup cftab to facilitate generation of T^(-1).}
t:=0;
for i:=0 to 256 do
begin
nn:=cftab[i];
cftab[i]:=t;
{ writeln(i,' ',t);}
inc(t,nn);
end;
end;
{$ifndef HAVE_DETRANSFORM}
procedure TDecompressBzip2Stream.detransform;
var a:cardinal;
p,q,r:Pcardinal;
begin
a:=0;
p:=@tt^[0];
q:=p+tt_count;
while p<>q do
begin
r:=@tt^[cftab[p^ and $ff]];
inc(cftab[p^ and $ff]);
r^:=r^ or a;
inc(a,256);
inc(p);
end;
end;
{$endif}
function TDecompressBzip2Stream.decode_block:boolean;
{Decode a new compressed block.}
var magic:array[1..6] of char;
stored_blockcrc:cardinal;
i:byte;
begin
for i:=1 to 6 do
magic[i]:=char(get_byte);
if magic='1AY&SY' then
begin
inc(current_block);
stored_blockcrc:=get_cardinal;
block_randomized:=get_boolean;
block_origin:=get_cardinal24;
{Receive the mapping table.}
receive_mapping_table;
alphasize:=cardinal(inuse_count)+2;
{Receive the selectors. Raises exception}
receive_selectors;
{Undo the MTF values for the selectors.}
undo_mtf_values;
{Receive the coding tables.}
receive_coding_tables;
{Build the Huffman tables.}
make_hufftab;
{Receive the MTF values.}
receive_mtf_values;
{Undo the Burrows Wheeler transformation.}
detransform;
decode_available:=tt_count;
Result:=True;
end
else
begin
if magic<>#$17'rE8P'#$90 then
error(SDecodingError,bzip2_bad_block_magic);
Result:=false;
end;
end;
Function TDecompressBzip2Stream.new_block : Boolean;
begin
Result:=decode_block;
If result then
nextrle:=@tt^[tt^[block_origin] shr 8]
else
nextrle:=nil;
end;
Function TDecompressBzip2Stream.consume_rle : Boolean;inline;
{Make nextrle point to the next decoded byte. If nextrle did point to the last
byte in the current block, decode the next block.}
begin
{ Pcardinal(nextrle)^:=Pcardinal(nextrle)^ shr 8;}
nextrle:=@tt^[Pcardinal(nextrle)^ shr 8];
dec(decode_available);
if decode_available=0 then
Result:=new_block
else
Result:=True;
end;
Function TDecompressBzip2Stream.rle_read(bufptr:Pbyte;Count:Longint) : LongInt;
var rle_len:cardinal;
data:byte;
label rle_write;
begin
Result:=0;
rle_len:=rle_run_left;
data:=rle_run_data;
if block_randomized then
{Not yet implemented.}
Error(SErrUnimplemented,-1)
else
begin
if rle_len<>0 then
{Speed is important. Instead of an if statement within the
repeat loop use a goto outside the loop.}
goto rle_write;
repeat
if decode_available=0 then
break;
rle_len:=1;
data:=nextrle^;
if consume_rle and (decode_available>0) and (data=nextrle^) then
begin
inc(rle_len);
if consume_rle and (decode_available>0) and (data=nextrle^) then
begin
inc(rle_len);
if consume_rle and (decode_available>0) and (data=nextrle^) then
begin
if consume_rle then
inc(rle_len,nextrle^+1);
consume_rle;
end;
end;
end;
rle_write:
repeat
bufptr^:=data;
inc(bufptr);
dec(count);
dec(rle_len);
inc(Result);
until (rle_len=0) or (count=0);
until count=0;
end;
rle_run_data:=data;
rle_run_left:=rle_len;
end;
Function TDecompressBzip2Stream.Read(var Buffer; Count : Longint) : LongInt;
var bufptr:Pbyte;
begin
bufptr:=@buffer;
if decode_available=high(decode_available) then
begin
{Initialize the rle process:
- Decode a block
- Initialize pointer.}
system.Write('.');
if not decode_block then
begin
nextrle:=nil;
error(SDecodingError,bzip2_endoffile);
end;
nextrle:=@tt^[tt^[block_origin] shr 8];
end;
Result:=rle_read(bufptr,count);
end;
Destructor TDecompressBzip2Stream.Destroy;
begin
if tt<>nil then
FreeMem(tt,blocksize*100000*sizeof(cardinal));
Inherited;
end;
end.