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Get a Remote File's Size (32-bit)

Demonstrates the Chilkat SFtp.GetFileSize32 method, which returns a remote file's size in bytes as a 32-bit integer. The arguments are the remote path (or handle), whether symbolic links are followed, and whether the first argument is a handle.

Background: A 32-bit signed integer tops out near 2 GB, so this is fine for ordinary files but will misreport or fail for larger ones. When a file might exceed that, use GetFileSizeStr, which returns the size as a decimal string and cannot overflow. The two boolean arguments are shared by all the attribute getters: the first follows symbolic links to their target, and the second says whether you passed a path or an open handle.

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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 SFtp.GetFileSize32 method, which returns a remote file's size in bytes as a
    // 32-bit integer.  The 1st argument is the remote path (or handle), the 2nd selects whether
    // symbolic links are followed, and the 3rd indicates whether the 1st argument is a handle.

    const sftp = try chilkat.SFtp.init();
    defer sftp.deinit();

    // Connect, authenticate, and initialize the SFTP subsystem.
    const port = 22;
    sftp.connect("sftp.example.com", port) catch {
        std.debug.print("{s}\n", .{try sftp.getLastErrorText(alloc)});
        return;
    };

    // 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.
    const password = "mySshPassword";

    sftp.authenticatePw("mySshLogin", password) catch {
        std.debug.print("{s}\n", .{try sftp.getLastErrorText(alloc)});
        return;
    };

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

    // The 2nd argument (bFollowLinks) selects whether a symbolic link is followed to its target.
    // The 3rd argument (bIsHandle) is false here because the 1st argument is a path, not an
    // open handle.
    const b_follow_links = true;
    const b_is_handle = false;

    const file_size = sftp.getFileSize32("subdir/report.pdf", b_follow_links, b_is_handle);
    if (file_size < 0) {
        std.debug.print("{s}\n", .{try sftp.getLastErrorText(alloc)});
        return;
    }

    std.debug.print("File size: {d} bytes\n", .{file_size});

    // Note: For files that may exceed 2 GB, use GetFileSizeStr (returns a decimal string) instead,
    // because the value can overflow a 32-bit integer.

    sftp.disconnect();
}