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SpecValidator

vhdx::validation

Struct SpecValidator 

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pub struct SpecValidator { /* private fields */ }
Expand description

VHDX specification compliance validator.

Holds a snapshot of the file data buffer and performs read-only structural checks against MS-VHDX and companion standards.

§Construction

Typically constructed with the file’s full data buffer and configuration flags (strict mode, whether the disk is differencing).

Implementations§

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impl SpecValidator

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pub fn validate_bat(&self) -> Result<Vec<ValidationIssue>>

Validate the Block Allocation Table.

Checks:

  • Entry states are valid values
  • State matches disk type (e.g., fixed disk has no Unmapped)
  • Sector bitmap entries in non-differencing disks are NotPresent
  • File offsets are aligned
§Errors

Returns an error when BAT structure or state rules are violated.

§Panics

Panics if integer conversion for minimum BAT entry count overflows usize (should not occur with valid metadata).

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impl SpecValidator

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pub fn validate_file(&self) -> Result<Vec<ValidationIssue>>

Run all structural validations.

Calls each sub-validation in order. Returns the first error encountered.

§Errors

Returns the first hard validation error from a sub-validation stage.

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impl SpecValidator

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pub fn validate_header(&self) -> Result<Vec<ValidationIssue>>

Validate the header section.

Checks:

  • File type identifier signature (“vhdxfile”)
  • Header 1 and Header 2 signatures, CRC-32C, version
  • Sequence number comparison (both headers valid)
  • LogGuid consistency between headers
§Errors

Returns an error when required header invariants fail.

§Panics

Panics on internal invariant violations where code unwraps a known error branch after is_ok() checks.

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impl SpecValidator

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pub fn validate_log(&self) -> Result<Vec<ValidationIssue>>

Validate the log section.

§Errors

Returns an error when log entry integrity or sequencing checks fail.

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impl SpecValidator

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pub fn validate_metadata(&self) -> Result<Vec<ValidationIssue>>

Validate the metadata table and item structure.

Checks:

  • Table signature “metadata”
  • Entry count <= 2047
  • Entry offset/length bounds (within metadata region)
  • No items extend beyond the region
§Errors

Returns an error when metadata table or item constraints are violated.

§Panics

Panics if checked integer conversions for metadata range bookkeeping are violated unexpectedly.

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pub fn validate_required_metadata_items(&self) -> Result<Vec<ValidationIssue>>

Validate that all required metadata items are present.

Required items (MS-VHDX §2.6.2):

  • FileParameters
  • VirtualDiskSize
  • VirtualDiskId
  • LogicalSectorSize
  • PhysicalSectorSize
  • ParentLocator (if differencing disk)
§Errors

Returns an error when required metadata entries or required payloads are missing.

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impl SpecValidator

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pub fn validate_parent_locator(&self) -> Result<Vec<ValidationIssue>>

Validate the parent locator for differencing disks.

§Errors

Returns an error when parent locator keys, paths, or linkage are invalid.

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impl SpecValidator

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pub fn validate_region_table(&self) -> Result<Vec<ValidationIssue>>

Validate the region tables.

Checks:

  • “regi” signature and CRC-32C for both region tables
  • Entry alignment (1 MB)
  • Entry overlap (no two regions’ ranges overlap)
  • Entry count <= 2047
  • Required unknown region handling (strict mode)
§Errors

Returns an error when region table integrity checks fail.

§Panics

Panics on internal invariant violations where code unwraps region tables after prior successful checks.

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