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IO::Buffer::Storage#resize
static VALUE
io_buffer_resize(VALUE self, VALUE size)
{
rb_check_frozen(self);
rb_io_buffer_resize(self, io_buffer_extract_size(size));
return self;
}
Resizes a buffer to a new_size bytes, preserving its content. Depending on the old and new size, the memory area associated with the buffer might be either extended, or rellocated at different address with content being copied.
buffer = IO::Buffer.new(4) buffer.set_string("test", 0) buffer.resize(8) # resize to 8 bytes # => # #<IO::Buffer 0x0000555f5d1a1630+8 INTERNAL> # 0x00000000 74 65 73 74 00 00 00 00 test....
When the buffer is a slice, resizing changes the size of the view without modifying the source buffer or allocating new storage. The resized view must remain within the source buffer. Growing the view exposes the existing bytes in the source; they are not cleared. Because the source allocation does not change, a slice can be resized while its source is locked.
External owning buffers (created with ::for), and locked owning buffers cannot be resized. Frozen buffers cannot be resized.