Function appendLz [src]

Fetch an LZ sequence (length, distance) from inside the buffer

Prototype

pub fn appendLz( self: *AccumBuffer, allocator: Allocator, len: usize, dist: usize, writer: *Writer, ) !void

Parameters

self: *AccumBufferallocator: Allocatorlen: usizedist: usizewriter: *Writer

Source

  pub fn appendLz(
    self: *AccumBuffer,
    allocator: Allocator,
    len: usize,
    dist: usize,
    writer: *Writer,
) !void {
    _ = writer;

    const buf_len = self.buf.items.len;
    if (dist > buf_len) return error.CorruptInput;

    try self.buf.ensureUnusedCapacity(allocator, len);
    const buffer = self.buf.allocatedSlice();
    const src = buffer[buf_len - dist ..][0..len];
    const dst = buffer[buf_len..][0..len];

    // This is not a @memmove; it intentionally repeats patterns caused by
    // iterating one byte at a time.
    for (dst, src) |*d, s| d.* = s;

    self.buf.items.len = buf_len + len;
    self.len += len;
}  