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#include <stdlib.h>
#include <string.h>
#include "src/common.h"
static void uv_link_def_alloc_cb(uv_link_t* link,
size_t suggested_size,
uv_buf_t* buf) {
static const size_t kBufferSize = 16 * 1024;
buf->base = malloc(kBufferSize);
buf->len = kBufferSize;
CHECK_NE(buf->base, NULL, "uv_link_t: alloc_cb failure");
}
static void uv_link_def_read_cb(uv_link_t* link,
ssize_t nread,
const uv_buf_t* buf) {
free(buf->base);
}
int uv_link_init(uv_link_t* link, uv_link_methods_t const* methods) {
memset(link, 0, sizeof(*link));
link->alloc_cb = uv_link_def_alloc_cb;
link->read_cb = uv_link_def_read_cb;
link->methods = methods;
return 0;
}
void uv_link_close(uv_link_t* link) {
link->alloc_cb = NULL;
link->read_cb = NULL;
link->methods = NULL;
}
int uv_link_chain(uv_link_t* from, uv_link_t* to) {
if (from->child != NULL || to->parent != NULL)
return UV_EINVAL;
from->child = to;
to->parent = from;
from->saved_alloc_cb = from->alloc_cb;
from->saved_read_cb = from->read_cb;
from->alloc_cb = to->methods->alloc_cb_override;
from->read_cb = to->methods->read_cb_override;
return 0;
}
int uv_link_unchain(uv_link_t* from, uv_link_t* to) {
if (from->child != to || to->parent != from)
return UV_EINVAL;
from->child = NULL;
to->parent = NULL;
from->alloc_cb = from->saved_alloc_cb;
from->read_cb = from->saved_read_cb;
from->saved_alloc_cb = NULL;
from->saved_read_cb = NULL;
return 0;
}
void uv_link_propagate_alloc_cb(uv_link_t* link,
size_t suggested_size,
uv_buf_t* buf) {
uv_link_t* target;
target = link;
if (link->child != NULL)
target = link->child;
link->alloc_cb(target, suggested_size, buf);
}
void uv_link_propagate_read_cb(uv_link_t* link,
ssize_t nread,
const uv_buf_t* buf) {
uv_link_t* target;
target = link;
if (link->child != NULL)
target = link->child;
link->read_cb(target, nread, buf);
}
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