| /* |
| Copyright (c) 2013 Martin Sustrik All rights reserved. |
| |
| Permission is hereby granted, free of charge, to any person obtaining a copy |
| of this software and associated documentation files (the "Software"), |
| to deal in the Software without restriction, including without limitation |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| and/or sell copies of the Software, and to permit persons to whom |
| the Software is furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be included |
| in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| IN THE SOFTWARE. |
| */ |
| |
| #include "chunkref.h" |
| #include "err.h" |
| |
| #include <string.h> |
| |
| /* nn_chunkref should be reinterpreted as this structure in case the first |
| byte ('tag') is 0xff. */ |
| struct nn_chunkref_chunk { |
| uint8_t tag; |
| void *chunk; |
| }; |
| |
| /* Check whether VSM are small enough for size to fit into the first byte |
| of the structure. */ |
| CT_ASSERT (NN_CHUNKREF_MAX < 255); |
| |
| /* Check whether nn_chunkref_chunk fits into nn_chunkref. */ |
| CT_ASSERT (sizeof (struct nn_chunkref) >= sizeof (struct nn_chunkref_chunk)); |
| |
| void nn_chunkref_init (struct nn_chunkref *self, size_t size) |
| { |
| int rc; |
| struct nn_chunkref_chunk *ch; |
| |
| if (size < NN_CHUNKREF_MAX) { |
| self->u.ref [0] = (uint8_t) size; |
| return; |
| } |
| |
| ch = (struct nn_chunkref_chunk*) self; |
| ch->tag = 0xff; |
| rc = nn_chunk_alloc (size, 0, &ch->chunk); |
| errno_assert (rc == 0); |
| } |
| |
| void nn_chunkref_init_chunk (struct nn_chunkref *self, void *chunk) |
| { |
| struct nn_chunkref_chunk *ch; |
| |
| ch = (struct nn_chunkref_chunk*) self; |
| ch->tag = 0xff; |
| ch->chunk = chunk; |
| } |
| |
| void nn_chunkref_term (struct nn_chunkref *self) |
| { |
| struct nn_chunkref_chunk *ch; |
| |
| if (self->u.ref [0] == 0xff) { |
| ch = (struct nn_chunkref_chunk*) self; |
| nn_chunk_free (ch->chunk); |
| } |
| } |
| |
| void *nn_chunkref_getchunk (struct nn_chunkref *self) |
| { |
| int rc; |
| struct nn_chunkref_chunk *ch; |
| void *chunk; |
| |
| if (self->u.ref [0] == 0xff) { |
| ch = (struct nn_chunkref_chunk*) self; |
| self->u.ref [0] = 0; |
| return ch->chunk; |
| } |
| |
| rc = nn_chunk_alloc (self->u.ref [0], 0, &chunk); |
| errno_assert (rc == 0); |
| memcpy (chunk, &self->u.ref [1], self->u.ref [0]); |
| self->u.ref [0] = 0; |
| return chunk; |
| } |
| |
| void nn_chunkref_mv (struct nn_chunkref *dst, struct nn_chunkref *src) |
| { |
| memcpy (dst, src, src->u.ref [0] == 0xff ? |
| (int)sizeof (struct nn_chunkref_chunk) : src->u.ref [0] + 1); |
| } |
| |
| void nn_chunkref_cp (struct nn_chunkref *dst, struct nn_chunkref *src) |
| { |
| struct nn_chunkref_chunk *ch; |
| |
| if (src->u.ref [0] == 0xff) { |
| ch = (struct nn_chunkref_chunk*) src; |
| nn_chunk_addref (ch->chunk, 1); |
| } |
| memcpy (dst, src, sizeof (struct nn_chunkref)); |
| } |
| |
| void *nn_chunkref_data (struct nn_chunkref *self) |
| { |
| return self->u.ref [0] == 0xff ? |
| ((struct nn_chunkref_chunk*) self)->chunk : |
| &self->u.ref [1]; |
| } |
| |
| size_t nn_chunkref_size (struct nn_chunkref *self) |
| { |
| return self->u.ref [0] == 0xff ? |
| nn_chunk_size (((struct nn_chunkref_chunk*) self)->chunk) : |
| self->u.ref [0]; |
| } |
| |
| void nn_chunkref_trim (struct nn_chunkref *self, size_t n) |
| { |
| struct nn_chunkref_chunk *ch; |
| |
| if (self->u.ref [0] == 0xff) { |
| ch = (struct nn_chunkref_chunk*) self; |
| ch->chunk = nn_chunk_trim (ch->chunk, n); |
| return; |
| } |
| |
| nn_assert (self->u.ref [0] >= n); |
| memmove (&self->u.ref [1], &self->u.ref [1 + n], self->u.ref [0] - n); |
| self->u.ref [0] -= (uint8_t) n; |
| } |
| |
| void nn_chunkref_bulkcopy_start (struct nn_chunkref *self, uint32_t copies) |
| { |
| struct nn_chunkref_chunk *ch; |
| |
| if (self->u.ref [0] == 0xff) { |
| ch = (struct nn_chunkref_chunk*) self; |
| nn_chunk_addref (ch->chunk, copies); |
| } |
| } |
| |
| void nn_chunkref_bulkcopy_cp (struct nn_chunkref *dst, struct nn_chunkref *src) |
| { |
| memcpy (dst, src, sizeof (struct nn_chunkref)); |
| } |
| |