borland.fix

压缩算法的源代码

Notes on patching Borland (binary) executables so they'll understand Unix-
style, LF-delimited ASCII files (from Onno van der Linden, c/o Frank van
der Linden, [e-mail]).


1. The CPP used by TC 2.0 can't handle unix-style (LF-terminated) lines.
   The CPP used by BC++ 2.0 can.
   The CPP used by BC++ 3.0 can't handle #if statements with unix-style lines.
   Fixes for both these problems below (GRR:  offset, new byte, old byte).

     Comparing files \TC\CPP.EXE and \TC\CPP.OLD
     00004F25: 0D 0A
     00005E3D: 0D 0A
     00007916: 0D 0A
     000079D6: 0D 0A
     00007AC1: 0A 0D
     0000D8EE: EC F7
     0000D8F1: F7 EC
     0000D9EE: EC F7
     0000D9F1: F7 EC
     0000DC80: 0A 0D
     0000DC90: 0A 0D

     Comparing files \BORLANDC\BIN\CPP.EXE and \BORLANDC\BIN\CPP.OLD
     0001D150: 89 75
     0001D151: 36 08
     0001D152: 30 89
     0001D153: 23 36
     0001D154: 75 30
     0001D155: 04 23
     0001D288: 9A 89
     0001D289: FF 36
     0001D28A: FF 30
     0001D28B: 00 23
     0001D28C: 00 9A
     0001D28E: 0E FF
     0001D28F: 30 00
     0001D290: 23 00
     0001E5A7: 89 8D


2. The compilers (tcc 2.0 and bcc 3.0) are both one-pass compilers; i.e.,
   cpp.exe isn't used when compiling with tcc or bcc.  The earlier statements
   about both cpp's are the same for the builtin preprocesser in the compilers.
   To fix the unix-style line stuff for the compilers, apply the fixes below.
   I do have something called bpatch.c which reads in the output of fc /b and
   changes the executable.  If anyone is too lazy to write it himself, just
   send out a mail.

     Comparing files TCC.EXE and TCC.OLD
     00005E06: BF 88
     00005E07: 02 01
     00005E0C: 88 BF
     00005E0D: 01 02
     00006E7C: 0A 0D
     00011FF9: 0A 0D
     00012059: 0A 0D
     00017E6C: 0A 0D
     00018181: 0A 0D
     000181F6: 0A 0D
     00018AC1: 0A 0D
     00018B27: 0D 0A
     00018BBE: 0A 0D
     00018C12: 0A 0D
     00018C6A: 0A 0D
     0001948A: 0A 0D
     000194B7: 0D 0A
     00019507: 0A 0D
     0001C093: 0A 0D
     0001C495: 3C 89
     0001C496: 0D 46
     0001C497: 74 FC
     0001C498: DF 3D
     0001C499: FF 0D
     0001C49A: 0E 00
     0001C49B: 34 75
     0001C49C: 50 03
     0001C49D: 3C E9
     0001C49E: 0A F6
     0001C49F: 75 FB
     0001C4A0: 03 FF
     0001C4A1: E9 0E
     0001C4A2: F2 34
     0001C4A3: FB 50
     0001C4D0: 0A 0D
     0001CFA7: 0A 0D
     0001CFBA: 0D 0A
     0001D007: 0A 0D
     0002A13C: 0A 0D
     0002A14C: 0A 0D
     0002A2B6: EC F7
     0002A2B9: F7 EC
     0002A3B6: EC F7
     0002A3B9: F7 EC
     0002A4B6: EC F7
     0002A4B9: F7 EC
     0002BDC3: 20 21
     0002BDC6: 21 20
     
     Comparing files BCC.EXE and BCC.OLD
     0002B877: 89 75
     0002B878: 36 08
     0002B879: 5C 89
     0002B87A: 5F 36
     0002B87B: 75 5C
     0002B87C: 04 5F
     0002B9AF: 0E 89
     0002B9B0: E8 36
     0002B9B1: 56 5C
     0002B9B2: DC 5F
     0002B9B3: FF 90
     0002B9B5: 5C E8
     0002B9B6: 5F 51
     0002B9B7: 90 DC
     
   Just an addition: the first one was for the cpp.exe's, the recent one is for
   the compilers (bcc.exe, tcc.exe).  The first one is a bit redundant because
   cpp.exe is hardly ever used.  See it as an attempt to make things complete.


3. For those of you who are using NDMAKE45 under MSDOS:
   version 4.5 predefines the macro's MAKE and MFLAGS as readonly's.
   So there was no way you could use $(MAKE) with ndmake45.
   Here are the fc /b's that make things work:

     Comparing files MAKE45.EXE and MAKE45.OLD
     000019C0: 00 03   # MFLAG
     000019DC: 00 03   # MAKE
     00007BEA: 0A 7E   # output of make -p
     00007BEB: 00 0A   #

     Comparing files MAKE45L.EXE and MAKE45L.OLD
     0000277E: 00 03   # MFLAG
     0000279D: 00 03   # MAKE
     0000A6A8: 0A 7E   # output of make -p
     0000A6A9: 00 0A