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https://github.com/cloud-hypervisor/cloud-hypervisor.git
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452af9b17c
Microsoft’s VHDx block device format specification is implemented here as a crate. This commit includes the implementation for the fixed and dynamic formats, where the other format is known as differencing. The vhdx_header.rs, vhdx_bat.rs, vhdx_metadata.rs implements parser and manipulators for the VHDx header, Block Allocation Table, and metadata, respectively, for the VHDx file. The vhdx_io.rs implements read and write routines for the VHDx file. The vhdx.rs implements the Vhdx structure, which provides the wrapper functions for standard I/O operations like read, write, and seek. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com> Signed-off-by: Fazla Mehrab <akm.fazla.mehrab@intel.com>
32 lines
796 B
Rust
32 lines
796 B
Rust
// Copyright © 2021 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0
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use byteorder::{BigEndian, ByteOrder};
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use std::result::Result;
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use uuid::Uuid;
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macro_rules! div_round_up {
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($n:expr,$d:expr) => {
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($n + $d - 1) / $d
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};
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}
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pub mod vhdx;
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mod vhdx_bat;
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mod vhdx_header;
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mod vhdx_io;
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mod vhdx_metadata;
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pub(crate) fn uuid_from_guid(buf: &[u8]) -> Result<Uuid, uuid::Error> {
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// The first 3 fields of UUID are stored in Big Endian format, and
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// the last 8 bytes are stored as byte array. Therefore, we read the
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// first 3 fields in Big Endian format instead of Little Endian.
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Uuid::from_fields_le(
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BigEndian::read_u32(&buf[0..4]),
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BigEndian::read_u16(&buf[4..6]),
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BigEndian::read_u16(&buf[6..8]),
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&buf[8..16],
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)
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}
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