Function execute 

pub fn execute(
    opts: &ParseOptions,
    writer: &mut dyn Write,
) -> Result<(), IdbError>

Parse an InnoDB tablespace file and display page headers with a type summary.

Opens the tablespace, auto-detects (or uses the overridden) page size, then iterates over every page reading the 38-byte FIL header to extract the checksum, page number, prev/next page pointers, LSN, page type, and space ID. Page 0 additionally displays the FSP header (space ID, tablespace size, free-page limit, and flags).

When the tablespace has more than one page, all page data is read into memory and headers are parsed in parallel using rayon. Results are collected in page order for deterministic output.

In single-page mode (-p N), only the specified page is printed with its full FIL header and trailer. In full-file mode (the default), all pages are listed and a frequency summary table is appended showing how many pages of each type exist. Pages with zero checksum and type Allocated are skipped by default unless --verbose is set; --no-empty additionally filters these from --json output.

With --verbose, each page also shows checksum validation status (algorithm, stored vs. calculated values) and LSN consistency between header and trailer.