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Get an FTP Listing Entry's Size (32-bit)

Demonstrates the Chilkat Ftp2.GetSize method, which returns the size in bytes of a cached directory-listing entry as a 32-bit integer. The only argument is a zero-based index. It returns -1 when the index is invalid or the size is unavailable.

Background: The size comes from the cached listing, so reading it for every entry costs no extra round trips. A 32-bit result cannot represent files past about 2 GB, so use GetSize64 (or GetSizeStr) when large files are possible. Directories often report no meaningful size and come back as -1, which is why the -1 case is worth handling rather than printing blindly.

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const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // Demonstrates the Ftp2.GetSize method, which returns the size in bytes of a cached
    // directory-listing entry as a 32-bit integer.  The only argument is a zero-based index.

    const ftp = try chilkat.Ftp2.init();
    defer ftp.deinit();

    ftp.setHostname("ftp.example.com");
    ftp.setUsername("myFtpLogin");

    // Normally you would not hard-code the password in source.  You should instead obtain it
    // from an interactive prompt, environment variable, or a secrets vault.
    ftp.setPassword("myPassword");

    ftp.connect() catch {
        std.debug.print("{s}\n", .{try ftp.getLastErrorText(alloc)});
        return;
    };

    ftp.changeRemoteDir("public_html") catch {
        std.debug.print("{s}\n", .{try ftp.getLastErrorText(alloc)});
        return;
    };

    // GetDirCount retrieves the directory listing on the first call and returns the number of
    // entries.  A negative return indicates failure.
    const n = ftp.getDirCount();
    if (n < 0) {
        std.debug.print("{s}\n", .{try ftp.getLastErrorText(alloc)});
        return;
    }

    var i: i32 = 0;
    i = 0;
    while (i < n) : (i += 1) {
        const name = try ftp.getFilename(alloc, i);

        // GetSize returns -1 when the index is invalid or the size is unavailable (for example for a
        // directory).  Use GetSize64 for files that may exceed 2 GB.
        const file_size = ftp.getSize(i);
        std.debug.print("{s}  {d} bytes\n", .{ name, file_size });
    }

    ftp.disconnect() catch {
        std.debug.print("{s}\n", .{try ftp.getLastErrorText(alloc)});
        return;
    };
}