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# gzseek

gzseek -- seek on a gz-file pointer

## Description

`int gzseek`(int zp, int offset);

Sets the file position indicator for the file referenced by zp to offset bytes into the file stream. Equivalent to calling (in C) `gzseek( zp, offset, SEEK_SET )`.

If the file is opened for reading, this function is emulated but can be extremely slow. If the file is opened for writing, only forward seeks are supported; gzseek then compresses a sequence of zeroes up to the new starting position.

Upon success, returns 0; otherwise, returns -1. Note that seeking past EOF is not considered an error.

See also gztell() and gzrewind().

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