feat(rust/cbork-utils): deterministic cbor decoder #346
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Adds validation for minimal length encoding of string types (Str and Bytes) in the DeterministicDecoder according to RFC 8949 Section 4.2. This ensures that string lengths are encoded using the minimal number of bytes required. For example, strings of length 0-23 must use direct encoding, length 24-255 must use one byte, etc. The changes: - Add length validation for Type::Str and Type::Bytes - Check for indefinite length strings - Validate minimal length encoding using check_minimal_length function
Adds comprehensive test coverage for RFC 8949 Section 4.2 deterministic encoding requirements. The new tests verify: - Minimal length integer encoding rules for values 0-23, 24-255, etc. - Floating point value requirements including shortest form and non-finite prohibition - String/array/map length encoding rules and indefinite length checks - Map key ordering rules with length-first canonical ordering Each test includes detailed comments explaining: - The specific RFC requirement being tested - Byte-level breakdown of CBOR encodings - Why each test case is valid or invalid - References to relevant RFC sections This ensures proper validation of all deterministic encoding rules and helps maintainers understand the requirements.
Add detailed test cases for deterministic CBOR encoding rules as specified in RFC 8949 section 4.2. The new tests cover: - Integer boundary conditions and minimal encoding requirements - Negative integer encoding across different ranges - Map key ordering (length-first, then lexicographic) - Floating point encoding with different precision requirements - String comparison ordering including UTF-8 handling - Nested structure validation - Array length encoding rules - Duplicate map key detection The tests are extensively documented with RFC requirements and include TODOs for future validation improvements, particularly for floating point handling where additional checks for non-finite values and minimal encoding could be added. Includes commented-out test cases that can be enabled once support for validating non-finite floating point values is implemented. RFC: https://datatracker.ietf.org/doc/html/rfc8949#section-4.2
Refactor test cases to fix clippy warnings: - Use simpler iterator chaining in array length test - Remove redundant calls - Replace explicit type annotations with inferred types - Fix collect() with redundant map operations Also simplify floating point test cases to match current implementation and improve RFC 8949 compliance documentation. The floating point tests now focus on valid encodings while keeping commented-out future test cases for non-finite values validation. Tests still verify the same RFC requirements but with more idiomatic Rust code.
cong-or
changed the title
Improve documentation and refactor validate_next() to align with RFC 8949 § 4.2 specification for deterministically encoded CBOR. Split validation logic into smaller, focused functions for better maintainability. - Split validate_next into specialized validation functions: * validate_integer() - Handles minimal integer encoding * validate_array() - Validates definite-length arrays * validate_string() - Checks string/bytes encoding * validate_map() - Ensures proper key ordering - Add comprehensive documentation referencing RFC 8949: * Detail core deterministic encoding requirements * Document rules for integer minimality * Explain length field constraints * Specify map key ordering rules * Include examples of valid/invalid encodings This refactoring improves code organization while maintaining full compliance with the CBOR deterministic encoding specification. The enhanced documentation helps developers understand both implementation details and RFC requirements.
Improve documentation and refactor validate_next() to align with RFC 8949 § 4.2 specification for deterministically encoded CBOR. Split validation logic into smaller, focused functions for better maintainability. - Split validate_next into specialized validation functions: * validate_integer() - Handles minimal integer encoding * validate_array() - Validates definite-length arrays * validate_string() - Checks string/bytes encoding * validate_map() - Ensures proper key ordering - Add comprehensive documentation referencing RFC 8949: * Detail core deterministic encoding requirements * Document rules for integer minimality * Explain length field constraints * Specify map key ordering rules * Include examples of valid/invalid encodings This refactoring improves code organization while maintaining full compliance with the CBOR deterministic encoding specification. The enhanced documentation helps developers understand both implementation details and RFC requirements.
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WIP
RFC 8949's Section 4.2 specification: deterministic CBOR encoding requirements:
🔸 Partial Implementation: