22 lines
630 B
Swift
22 lines
630 B
Swift
import Foundation
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struct RDEPUBChapterOffsetMap {
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let fragmentOffsets: [String: Int]
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let pageStartOffsets: [Int]
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let pageEndOffsets: [Int]
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/// fragmentID -> 章内字符偏移
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func chapterOffset(forFragmentID fragmentID: String) -> Int? {
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return fragmentOffsets[fragmentID]
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}
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/// 章内字符偏移 -> 章内页码（从 0 开始）
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func pageIndex(forChapterOffset offset: Int) -> Int? {
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for i in 0..<pageStartOffsets.count {
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if offset >= pageStartOffsets[i] && offset <= pageEndOffsets[i] {
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return i
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}
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}
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return nil
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}
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} |