#RAR FORMAT CODE#
It is different in case of unpacking the files – the source code is available for use, but with a restriction regarding back-engineering its source code. There are also applications which have an agreement of the owner of the rights toward the proprietary format.
#RAR FORMAT RAR#
RAR archives are created only with the graphic interface WinRAR software for Microsoft Windows system, and in a RAR console program in other platforms. CRC32 checksums and 256-bit BLAKE2 hash files.
Dividing large archives into several smaller ones – using a complex extension,.Retrieving data after an error, using the REV backup files,.It provides a high level compression and supports many additional functionalities, such as: This format was developed in its initial version in the year 1993, by a Russian programmer – Eugene Roshal, and currently it is being developed along with the WinRAR software. RAR extension contain data archives compressed with a proprietary algorithm. seq : - id : crc16 type : u2 doc : CRC16 of whole block or some part of it (depends on block type) - id : block_type type : u1 enum : block_types - id : flags type : u2 - id : block_size type : u2 doc : Size of block (header + body, but without additional content) - id : add_size type : u4 if : has_add doc : Size of additional content in this block - id : body size : body_size type : switch-on : block_type cases : 'block_types::file_header' : block_file_header - id : add_body size : add_size if : has_add doc : Additional content in this block instances : has_add : value : 'flags & 0x8000 != 0' doc : True if block has additional content attached to it header_size : value : 'has_add ? 11 : 7' body_size : value : block_size - header_size block_file_header : seq : - id : low_unp_size type : u4 doc : Uncompressed file size (lower 32 bits, if 64-bit header flag is present) - id : host_os type : u1 enum : oses doc : Operating system used for archiving - id : file_crc32 type : u4 - id : file_time size : 4 type : dos_datetime doc : Date and time in standard MS DOS format - id : rar_version type : u1 doc : RAR version needed to extract file (Version number is encoded as 10 * Major version + minor version.) - id : method type : u1 enum : methods doc : Compression method - id : name_size type : u2 doc : File name size - id : attr type : u4 doc : File attributes - id : high_pack_size type : u4 doc : Compressed file size, high 32 bits, only if 64-bit header flag is present if : '_parent.flags & 0x100 != 0' - id : file_name size : name_size - id : salt type : u8 if : '_parent.flags & 0x400 != 0' # - id: ext_time # variable size # if: '_parent.Files with the. There are several block types (see `block_type`), which have different `body` and `add_body`. seq : - id : magic1 contents : - 'Rar!' - 0x1a - 0x07 doc : "Fixed part of file's magic signature that doesn't change with RAR version" - id : version type : u1 doc : | Variable part of magic signature: 0 means old (RAR 1.5-4.0) format, 1 means new (RAR 5+) format - id : magic3 contents : if : version = 1 doc : New format (RAR 5+) magic contains extra byte block : doc : | Basic block that RAR files consist of.
Note that actually this signature is a valid RAR "block": in theory, one can omit signature reading at all, and read this normally, as a block, if exact RAR version is known (and thus it's possible to choose correct block format). This type would parse and validate both versions of signature.
#RAR FORMAT ARCHIVE#
doc-ref : seq : - id : magic type : magic_signature doc : File format signature to validate that it is indeed a RAR archive - id : blocks type : switch-on : magic.version cases : 0 : block 1 : block_v5 repeat : eos doc : Sequence of blocks that constitute the RAR file types : magic_signature : doc : | RAR uses either 7-byte magic for RAR versions 1.5 to 4.0, and 8-byte magic (and pretty different block format) for v5+.
#RAR FORMAT HOW TO#
Each block has fixed header and custom body (that depends on block type), so it's possible to skip block even if one doesn't know how to process a certain block type.
File format essentially consists of a linear sequence of blocks. There are two major versions of format (v1.5-4.0 and RAR v5+).
#RAR FORMAT LICENSE#
Meta : id : rar title : RAR (Roshall ARchiver) archive files application : RAR archiver file-extension : rar xref : forensicswiki : RAR justsolve : RAR loc : fdd000450 mime : - application/vnd.rar - application/x-rar-compressed pronom : - x-fmt/264 # RAR 2.0 - fmt/411 # RAR 2.9 - fmt/613 # RAR 5.0 wikidata : Q243303 license : CC0-1.0 ks-version : 0.7 imports : - /common/dos_datetime endian : le doc : | RAR is a archive format used by popular proprietary RAR archiver, created by Eugene Roshal.
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