Inaccuracy in the description of the HRIP archive header

Hello, All! In the HRIP_DOC.WRD file supplied with HRIP 1.05 contains the following: === cut === The archive begins with the following heading: IDARCH DB "HRi" ; identifier IDALL DB 0 ; number of files in the archive (used in ; Hrip when adding to the archive, so as not to ; there were more than 255 files SMESH DB 0 ; see below (BYTE) LAST DW 0 ; see below (SECS) CAT DB 0 ; 1 - the directory is present in the archive ; 0 - no directory The following formula shows how the end can be determined archive (in bytes from the beginning of the archive): END_ARCH=[LAST]*256-(256-[SMESH]) bytes The location of the directory, if present, can be determined by this formula: START_CAT=[LAST]*256 bytes That is, the directory is located in the last sector after the archive. As can be understood from the two formulas listed - between the end archive and the beginning of the directory have free space <256 bytes. Here This is where the “sharpening” under Tr-Dos comes into play. So simple implementation is made so that everyone can open archive with a catalog (especially since the catalog is almost similar to Tr-Dos'ovsky). === cut === In fact, the formula for calculating END_ARCH (i.e. archive length in bytes, excluding directory) should look like like this:END_ARCH=[LAST]*256-(256-[SMESH]) bytes, if SMESH>0; END_ARCH=[LAST]*256 bytes, if SMESH=0. Or like this: END_ARCH=[LAST-1]*256+[SMESH]) bytes, if SMESH>0; END_ARCH=[LAST]*256 bytes, if SMESH=0. Without branching, the formula can be written like this: END_ARCH=[LAST]*256-((256-[SMESH]) mod 256) bytes. Calculating END_ARCH in assembler (we get the result in HL:A): LD HL,(LAST) LD A,(SMESH) AND A JR Z,$+3 DEC HL The END_ARCH-1 calculation can be shorter and faster: LD HL,(LAST) LD A,(SMESH) DEC HL DEC A Best regards, Ivan Roshchin.

Hello Ivan! On April 25, 2003 you wrote to All: ───────═════ Beginning of the F.txt file ─ Personal letters to me (2:5002/81.8) ───────────────────── MY_MAIL (81.LOCAL) ─ Post: 50 out of 90 Rcv From: Kirill Trofimov 2:5002/81.14 Mon 23 Jun 03 22:39 To: Maxim Shelepov Mon 23 Jun 03 22:55 Subject: hrip ─────────────────── ──────────────────── ──────────────────── ──────────────────── Copied from area 81.LOCAL by ParToss 1.06.15/W32 alpha Greetings, Maxim! June 21, 2003 22:56, Maxim Shelepov wrote to Kirill Trofimov: MS> END_ARCH=[LAST]*256-(256-[SMESH]) bytes, if SMESH>0; MS> END_ARCH=[LAST]*256 bytes, if SMESH=0. MS> END_ARCH=[LAST-1]*256+[SMESH]) bytes, if SMESH>0; MS> END_ARCH=[LAST]*256 bytes, if SMESH=0. 256 in byte = 0 :) sinn'delirium tremens'freedom -+- Violet Cancer ───────═════ End of file F.txt ..:: freedom://delirium_tremens/~tiden ::..