refactor: adds optionalReadLimit params

[dwisiswant0]

to the following DLS functions:

• gzip_decode
• zlib_decode, and
• inflate

updated signatures:

-	gzip_decode(arg1 interface{}) interface{}
+	gzip_decode(data string, optionalReadLimit int) string

-	inflate(arg1 interface{}) interface{}
+	inflate(data string, optionalReadLimit int) string

-	zlib_decode(arg1 interface{}) interface{}
+	zlib_decode(data string, optionalReadLimit int) string

tests:

Test: zlib_decode(hex_decode("789cf248cdc9c907040000ffff058c01f5"))
Output: "Hello"
Test: gzip_decode(hex_decode("1f8b08000000000000fff248cdc9c907040000ffff8289d1f705000000"))
Output: "Hello"
Test: inflate(hex_decode("f248cdc9c907040000ffff"))
Output: "Hello"

Test: zlib_decode(hex_decode("789cf248cdc9c907040000ffff058c01f5"), 100)
Output: "Hello"
Test: gzip_decode(hex_decode("1f8b08000000000000fff248cdc9c907040000ffff8289d1f705000000"), 100)
Output: "Hello",
Test: inflate(hex_decode("f248cdc9c907040000ffff"), 100)
Output: "Hello"

Test: zlib_decode(hex_decode("789cf248cdc9c907040000ffff058c01f5"), 4)
Output: "Hell"
Test: gzip_decode(hex_decode("1f8b08000000000000fff248cdc9c907040000ffff8289d1f705000000"), 4)
Output: "Hell"
Test: inflate(hex_decode("f248cdc9c907040000ffff"), 4)
Output: "Hell"

closes #247

[HaimLC]

Does io.EOF the same behavior as io.ErrUnexpectedEOF in #248 ?

[dwisiswant0]

Does io.EOF the same behavior as io.ErrUnexpectedEOF in #248 ?

no, but because we’re using io.LimitReader, the reader will just return whatever data is available and then hit EOF. it won’t throw an error unless we switch to io.ReadFull, which expects a specific $$N$$ of data (e.g., fixed length block). if the input ends unexpectedly (corrupted or truncated or cut off), and the stream finishes before reaching that $$N$$ length, then it would return io.ErrUnexpectedEOF. see the tests. hope that clears things up!

• https://pkg.go.dev/io#EOF
• https://pkg.go.dev/io#ErrUnexpectedEOF