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Minor variable renaming & formatting. 

Signed-off-by: Adam Rocska <adam.rocska@adams.solutions>
This commit is contained in:
Adam Rocska 2020-05-02 10:36:58 +02:00
parent bac7cedd36
commit 24b54ec8cb
1 changed files with 6 additions and 8 deletions
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14
Sources/MaxMindDBReader/DataExtensions/IndexOfData.swift
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@ -3,22 +3,20 @@ import Foundation
extension Data {
fileprivate func boyerMoore(data: Data, from: Index) -> Index? {
let patternLength = data.count
precondition(patternLength > 0, "Pattern can't be empty.")
precondition(count >= patternLength, "Pattern can't be >= than the Data to search in.")
let patternCount = data.count
precondition(patternCount > 0, "Pattern can't be empty.")
precondition(count >= patternCount, "Pattern can't be >= than the Data to search in.")
precondition(indices.contains(from), "Index from which to start the lookup must be contained in the Data.")
var skipTable = [UInt8: Int]()
for (i, byte) in data.enumerated() {
skipTable[byte] = patternLength - i - 1
}
for (i, byte) in data.enumerated() { skipTable[byte] = patternCount - i - 1 }
let lastIndexOfSelf = endIndex
let lastIndexOfData = data.index(before: data.endIndex)
let lastByteOfData = data.last
var i = index(
from,
offsetBy: patternLength - 1,
offsetBy: patternCount - 1,
limitedBy: lastIndexOfSelf
) ?? lastIndexOfSelf
@ -44,7 +42,7 @@ extension Data {
} else {
i = index(
i,
offsetBy: skipTable[byte] ?? patternLength,
offsetBy: skipTable[byte] ?? patternCount,
limitedBy: lastIndexOfSelf
) ?? lastIndexOfSelf
}