steve
/
factor
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

add examples to checksums docs

db4
Doug Coleman 2009-09-30 02:26:32 -05:00
parent 0b0a2c5ce4
commit bc5807b20a
1 changed files with 27 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
core/checksums/checksums-docs.factor
View File

@ -20,15 +20,39 @@ HELP: checksum-stream
HELP: checksum-bytes
{ $values { "bytes" "a sequence of bytes" } { "checksum" "a checksum specifier" } { "value" byte-array } }
{ $contract "Computes the checksum of all data in a sequence." } ;
{ $contract "Computes the checksum of all data in a sequence." }
{ $examples
{ $example
"USING: checksums checksums.crc32 prettyprint ;"
"B{ 1 10 100 } crc32 checksum-bytes ."
"B{ 78 179 254 238 }"
}
} ;
HELP: checksum-lines
{ $values { "lines" "a sequence of sequences of bytes" } { "checksum" "a checksum specifier" } { "value" byte-array } }
{ $contract "Computes the checksum of all data in a sequence." } ;
{ $contract "Computes the checksum of all data in a sequence." }
{ $examples
{ $example
"USING: checksums checksums.crc32 prettyprint ;"
"""{
"Take me out to the ball game"
"Take me out with the crowd"
} crc32 checksum-lines ."""
"B{ 111 205 9 27 }"
}
} ;
HELP: checksum-file
{ $values { "path" "a pathname specifier" } { "checksum" "a checksum specifier" } { "value" byte-array } }
{ $contract "Computes the checksum of all data in a file." } ;
{ $contract "Computes the checksum of all data in a file." }
{ $examples
{ $example
"USING: checksums checksums.crc32 prettyprint ;"
""""resource:license.txt" crc32 checksum-file ."""
"B{ 100 139 199 92 }"
}
} ;
ARTICLE: "checksums" "Checksums"
"A " { $emphasis "checksum" } " is a function mapping sequences of bytes to fixed-length strings. While checksums are not one-to-one, a good checksum should have a low probability of collision. Additionally, some checksum algorithms are designed to be hard to reverse, in the sense that finding an input string which hashes to a given checksum string requires a brute-force search."