zip_fread man page
zip_fread — read from file
zip_fread(zip_file_t *file, void *buf, zip_uint64_t nbytes);
zip_fread() function reads at most nbytes bytes from file into buf.
If successful, the number of bytes actually read is returned. Otherwise, -1 is returned.
libzip(3), zip_fclose(3), zip_fopen(3), zip_fseek(3)
zip_fread() was added in libzip 0.6. In libzip 0.10 the return type was changed from ssize_t to zip_int64_t. In libzip 0.10 the type of nbytes was changed from size_t to zip_uint64_t.
Dieter Baron <email@example.com> and Thomas Klausner <firstname.lastname@example.org>
libzip(3), zip_fclose(3), zip_fopen(3), zip_fopen_encrypted(3), zip_fseek(3), zip_ftell(3).