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Man Pages
ZIP_SOURCE_SEEK_COMPUTE_OFFSET(3) FreeBSD Library Functions Manual ZIP_SOURCE_SEEK_COMPUTE_OFFSET(3)

zip_source_seek_compute_offset
validate arguments and compute offset

libzip (-lzip)

#include <zip.h>
zip_int64_t
zip_source_seek_compute_offset(zip_uint64_t offset, zip_uint64_t length, void *data, zip_uint64_t data_length, zip_error_t *error);

Use this function to compute the offset for a ZIP_SOURCE_SEEK or ZIP_SOURCE_SEEK_WRITE command. data and data_length are the arguments to the source callback, offset is the current offset and length is the length of the source data or, for ZIP_SOURCE_SEEK_WRITE, the amount of data written.

On success, it returns the new offset, on error it returns -1 and sets error.

zip_source_seek_compute_offset() fails if:
[]
One of the arguments is invalid or the seek would place the offset outside the data.

zip_source_function(3)

zip_source_seek_compute_offset() was added in libzip 1.0.

Dieter Baron <dillo@nih.at> and Thomas Klausner <tk@giga.or.at>
December 18, 2017 FreeBSD 12.0-RELEASE

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