hfs_fork_io.hpp

1. Overview

The hfs_fork_io.hpp file reads logical file forks through HFS+ extents and allocation blocks.

This is an interface and data-contract file. It declares the public and internal types used by this subsystem, allowing implementation files and callers to share a stable compile-time contract.

Its paired source or interface file is hfs_fork_io.cpp.

Primary responsibilities:

  • Resolve data and resource fork extents
  • Read fragmented fork ranges
  • Integrate overflow extents
  • Expose bounded logical reads

2. File Identity and Scope

  • Source path: src/hfs_fork_io.hpp
  • Language: C++
  • File role: interface and data-contract file
  • Physical lines: 125
  • Non-empty lines: 114
  • SHA-256: 7bdf58ffe6b9eedebeee185424f4a5c7e7758c0b3833e3dcd69bbedede944f8d

Declared namespaces:

  • hfs

3. Dependencies

3.1 Project Headers

  • hfs_format.hpp
  • disk_reader.hpp

3.2 Standard and External Headers

  • cstdint
  • string
  • vector

These dependencies define the file’s compile-time integration with the recovery engine, GTK interface, on-disk format decoders, operating-system services, or C++ standard library.

4. Declared Types

  • struct ExtentsOverflowKey.

5. Constants and Configuration Values

  • constexpr uint8_t kForkTypeData=0x00
  • constexpr uint8_t kForkTypeResource=0xFF

5.1 Operational Strings, Paths, Formats, or Commands

The following code literals are operationally relevant and may identify filesystem paths, helper commands, formats, signatures, or subsystem labels:

  • hfs_format.hpp

6. Data Members and Persistent State

The interface declares the following state-bearing members:

  • constexpr uint8_t kForkTypeData=0x00
  • constexpr uint8_t kForkTypeResource=0xFF
  • uint8_t forkType {0}
  • uint32_t fileID {0}
  • uint32_t startBlock {0}

These members hold configuration, parser context, UI widgets, source references, progress state, recovered metadata, or temporary resources according to the owning type.

7. API and Function Inventory

The following callable interfaces or definitions were detected:

  • bool read_fork_inline(DiskReader&reader,uint64_t volume_offset,uint32_t block_size,const ForkData&fork,uint64_t max_bytes,std::vector<unsigned char>&out,std::vector<std::string>&logs) – Reads or derives the requested information and returns or stores the decoded result.
  • bool read_fork_block_inline(DiskReader&reader,uint64_t volume_offset,uint32_t block_size,const ForkData&fork,uint64_t fork_logical_offset,unsigned char*block_buf) – Reads or derives the requested information and returns or stores the decoded result.
  • bool read_fork_full(DiskReader&reader,uint64_t volume_offset,uint32_t block_size,const ForkData&fork,const ForkData&extents_file,uint8_t forkType,uint32_t fileID,uint64_t max_bytes,std::vector<unsigned char>&extents_btree_buffer,std::vector<unsigned char>&out,std::vector<std::string>&logs) – Reads or derives the requested information and returns or stores the decoded result.

8. Operational Flow

The subsystem represented by this file normally participates in the following flow:

  1. Resolve data and resource fork extents.
  2. Read fragmented fork ranges.
  3. Integrate overflow extents.
  4. Expose bounded logical reads.
  5. Expose or execute the detected APIs: read_fork_inline, read_fork_block_inline, read_fork_full.
  6. Return explicit results, progress data, recovered records, or diagnostics to the calling layer.

9. Validation and Error Handling

  • Byte offsets, sizes and lengths must be validated before arithmetic and before every read to avoid overflow and out-of-bounds access.

10. Runtime, Concurrency, and Resource Management

  • Deterministic behavior: callers depend on explicit return values and stable data structures to distinguish successful recovery from partial or invalid results.

11. Security and Data-Recovery Considerations

  • Recovery code should prefer read-only source access and avoid writing to the original damaged medium.
  • Raw devices and image files are treated as untrusted binary input; every offset and length must remain bounded by the source size.

12. Implementation Considerations

  • Changes to public declarations can affect every translation unit that includes this header and should preserve binary and source compatibility where required.
  • State-bearing members should have explicit ownership and initialization semantics, especially for references, pointers, file descriptors and GTK widgets.
  • Large-device arithmetic uses 64-bit values; additions and multiplications should be checked before use as offsets or allocation sizes.

13. Integration with the Recovery Pipeline

  • The file belongs to the source-discovery, parsing or support layer.
  • Its results feed scanner, recovery or reporting modules through shared models.
  • The API should remain deterministic so higher layers can combine results safely.

14. Licensing and Provenance

No explicit copyright or software-license statement was detected in the opening section of this individual file. Distribution terms should therefore be verified against the project-level license and repository metadata.

The SHA-256 value in this document can be used to associate the generated documentation with the exact source version analyzed.

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