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[wasm] Fall back to a default chunk size when st_blksize is not available #835

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Merged
merged 1 commit into from
Aug 8, 2024
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[wasm] Fall back to a default chunk size when st_blksize is not available #835

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11 changes: 10 additions & 1 deletion Sources/FoundationEssentials/FileManager/FileOperations.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -872,7 +872,16 @@ enum _FileOperations {
}

let total: Int = Int(fileInfo.st_size)
let chunkSize: Int = Int(fileInfo.st_blksize)
// Respect the optimal block size for the file system if available
// Some platforms including WASI don't provide this information, so we
// fall back to the default chunk size 4KB, which is a common page size.
let defaultChunkSize = 1024 * 4 // 4KB
let chunkSize: Int
if fileInfo.st_blksize > 0 {
chunkSize = Int(fileInfo.st_blksize)
} else {
chunkSize = defaultChunkSize
}
var current: off_t = 0

#if os(WASI)
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