Module dbf 

dBASE III+/IV table reader for .dbf attribute sidecars.

Layout (header)

Bytes	Field
0	Version flags
1..4	Last-update YY MM DD
4..8	Number of records (u32 LE)
8..10	Header length in bytes (u16 LE)
10..12	Record length in bytes (u16 LE)
29	Language Driver ID (codepage hint)

Then (header_length - 32 - 1) / 32 field descriptors of 32 bytes each, terminated by 0x0D. Each record starts with a 1-byte deletion flag (0x20 active, 0x2A deleted) and is followed by fixed-width field values.

v0.1 field type coverage

• C Character — UTF-8/ASCII trimmed, → Value::String
• N Numeric (ASCII digits) — parsed to Value::Int64 if no decimals, else Value::Float64
• F Float (ASCII) — Value::Float64
• D Date (YYYYMMDD) — Value::DateTime (days since 1899-12-30)
• L Logical (T/F/Y/N/?) — Value::Bool, blank or ? → Value::Null
• Anything else (M memo, B, G, OLE, …) → Value::Null

Encoding

v0.1 assumes ASCII / UTF-8 input. Real .cpg / LDID handling is deferred to v0.2 — until then non-UTF-8 strings come through with invalid bytes replaced.

Structs

DbfField

DbfHeader

Functions

build_schema

Build a Schema from the DBF header + a geometry-column descriptor for the companion .shp.

decode_field

Decode the value of a single field within a record. record_bytes includes the 1-byte deletion flag at index 0.

field_to_def

Map a DBF field to a core FieldDef.

parse_header