fix: report allocated disk usage for sparse files (#182)#191
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diskusage reported each file's apparent/logical size via fs.FileInfo.Size(). For sparse files such as Docker Desktop's Docker.raw that is the max-allocatable limit (~1 TB) rather than the bytes actually on disk (~30 GB), causing diskusage to disagree wildly with `du` on the same path. Use allocated blocks (st_blocks * 512) on linux/darwin and GetCompressedFileSizeW on Windows, matching `du`'s default behavior. For non-sparse files the result is unchanged (block-rounding only). Fixes #182 Co-Authored-By: Claude <noreply@anthropic.com>
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diskusage reported each file's apparent/logical size via fs.FileInfo.Size(). For sparse files such as Docker Desktop's Docker.raw that is the max-allocatable limit (~1 TB) rather than the bytes actually on disk (~30 GB), causing diskusage to disagree wildly with
duon the same path.Use allocated blocks (st_blocks * 512) on linux/darwin and GetCompressedFileSizeW on Windows, matching
du's default behavior. For non-sparse files the result is unchanged (block-rounding only).Fixes #182