Implement limit directive for msgp array/map size bounds checking #419
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Add `//msgp:limit` directive to prevent DoS attacks by limiting array/slice and map sizes during msgp serialization/deserialization operations. Features: - Unified directive syntax: //msgp:limit arrays:n maps:n marshal:true/false - Applies only to dynamic slices/maps, excludes fixed arrays (compile-time sized) - Optional marshal-time enforcement with marshal:true parameter - Default limits of math.MaxUint32 when not specified - Returns msgp.ErrLimitExceeded when limits exceeded - Per-file unique constant generation using CRC32 hash to avoid collisions Usage examples: `//msgp:limit arrays:100 maps:50` (unmarshal limits only) `//msgp:limit arrays:100 maps:50 marshal:true` (both marshal and unmarshal limits)
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//msgp:limitdirective to prevent DoS attacks by limiting array/slice and map sizes during msgp serialization/deserialization operations.Features:
Usage examples:
//msgp:limit arrays:100 maps:50(unmarshal limits only)//msgp:limit arrays:100 maps:50 marshal:true(both marshal and unmarshal limits)Fixes #411