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The tracker protocol splits large server lists into batches, with each
batch preceded by a ServerInfoHeader. Previously, GetListing only read
the initial header and failed when encountering subsequent headers
mid-stream, causing the scanner to misinterpret header bytes as server
record data.
Changes:
- Refactored GetListing to use bufio.Reader instead of bufio.Scanner
to handle heterogeneous data (headers and server records)
- Added readServerRecord helper function for sequential reading
- Renamed ServerInfoHeader.SrvCountDup to BatchSize for clarity
- Added comprehensive documentation explaining the batching protocol
- Removed unused serverScanner function and tests
- Added table tests covering multiple batch scenarios
The BatchSize field indicates the number of servers in the current
batch, while SrvCount indicates the total across all batches.
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