Zig 0.17.0-dev (Split by item)

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sendFileHeader

Returns how many bytes from header and file_reader were consumed.

limit only applies to file_reader.

Writer.sendFileHeader

pub fn sendFileHeader(
    w: *Writer,
    header: []const u8,
    file_reader: *File.Reader,
    limit: Limit,
) FileError!usize

File

lib/std/Io/Writer.zig:952

Code

pub fn sendFileHeader(
    w: *Writer,
    header: []const u8,
    file_reader: *File.Reader,
    limit: Limit,
) FileError!usize {
    const new_end = w.end + header.len;
    if (new_end <= w.buffer.len) {
        @memcpy(w.buffer[w.end..][0..header.len], header);
        w.end = new_end;
        const file_bytes = w.vtable.sendFile(w, file_reader, limit) catch |err| switch (err) {
            error.ReadFailed, error.WriteFailed => |e| return e,
            error.EndOfStream, error.Unimplemented => |e| {
                // These errors are non-fatal, so if we wrote any header bytes, we will report that
                // and suppress this error. Only if there was no header may we return the error.
                if (header.len != 0) return header.len;
                return e;
            },
        };
        return header.len + file_bytes;
    }
    const buffered_contents = limit.slice(file_reader.interface.buffered());
    const n = try w.vtable.drain(w, &.{ header, buffered_contents }, 1);
    file_reader.interface.toss(n -| header.len);
    return n;
}