Front page | perl.perl6.internals |
Postings from October 2002
"Brent Dax" <brentdax@cpan.org> writes: [...] > Optional? > > # =item Add bytecode to segment > # > # Add in actual bytecode to the segment. > > Not optional. :^) really? There may be reasons to have no bytecode. This segment could not be run. This rises the question: If there are multiple segments, which bytecode is run. I would say the bytecode in the first segment from the beginning. Then only in the first segment the bytecode is non-optional. [...] > # =item Add binary data chunk to segment > # > # Add in some raw binary data to the bytecode segment > > Optional? > > Can you have multiple raw chunks? Can they have symbolic names? > Symbolic type names? I second that. > Are the other chunks essentially subclasses of this one? I have implemented a first draft of this (perl #18056). The diffrence is that I called the directory items PackFile_Segment. > Is there some kind of directory that tells you stuff about these chunks? > If there is, I can imagine two basic formats: > > SEGMENT 1 > DIRECTORY > CHUNK 1 > OFFSET: 100 (4 bytes) > SIZE: 55 (4 bytes) > NAME: "src" (7 bytes) > TYPE: "Parrot::Source Code" (23 bytes) > CHUNK 2 > OFFSET: 155 > SIZE: 524 > NAME: "bc" > TYPE: "Parrot::Bytecode" > ... > CHUNK 1 > use strict; > use warnings; > print "Hello World!\n"; > exit; > CHUNK 2 > 101011101... > > Or > > SEGMENT 1 > DIRECTORY > CHUNK 1 OFFSET: 100 > CHUNK 2 OFFSET: 189 > CHUNK 1: > SIZE: 55 > NAME: "src" > TYPE: "Parrot::Source Code" > DATA: ... > CHUNK 2: > SIZE: 524 > NAME: "bc" > TYPE: "Parrot::Bytecode" > DATA: ... I like the first one more: The data necessary to unpack a chunk is localized in the first chunk (the DIRECTORY). Only this part of the file needs to be read first. In the second case the metadata is scattered over the whole file. I will start modifing my patch to the new format. bye b. -- Juergen Boemmels boemmels@physik.uni-kl.de Fachbereich Physik Tel: ++49-(0)631-205-2817 Universitaet Kaiserslautern Fax: ++49-(0)631-205-3906 PGP Key fingerprint = 9F 56 54 3D 45 C1 32 6F 23 F6 C7 2F 85 93 DD 47Thread Previous | Thread Next