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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#define NGX_WSABUFS 8
ssize_t
ngx_wsarecv_chain(ngx_connection_t *c, ngx_chain_t *chain, off_t limit)
{
int rc;
u_char *prev;
u_long bytes, flags;
size_t n, size;
ngx_err_t err;
ngx_array_t vec;
ngx_event_t *rev;
LPWSABUF wsabuf;
WSABUF wsabufs[NGX_WSABUFS];
prev = NULL;
wsabuf = NULL;
flags = 0;
size = 0;
bytes = 0;
vec.elts = wsabufs;
vec.nelts = 0;
vec.size = sizeof(WSABUF);
vec.nalloc = NGX_WSABUFS;
vec.pool = c->pool;
/* coalesce the neighbouring bufs */
while (chain) {
n = chain->buf->end - chain->buf->last;
if (limit) {
if (size >= (size_t) limit) {
break;
}
if (size + n > (size_t) limit) {
n = (size_t) limit - size;
}
}
if (prev == chain->buf->last) {
wsabuf->len += n;
} else {
wsabuf = ngx_array_push(&vec);
if (wsabuf == NULL) {
return NGX_ERROR;
}
wsabuf->buf = (char *) chain->buf->last;
wsabuf->len = n;
}
size += n;
prev = chain->buf->end;
chain = chain->next;
}
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"WSARecv: %d:%d", vec.nelts, wsabuf->len);
rc = WSARecv(c->fd, vec.elts, vec.nelts, &bytes, &flags, NULL, NULL);
rev = c->read;
if (rc == -1) {
rev->ready = 0;
err = ngx_socket_errno;
if (err == WSAEWOULDBLOCK) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
"WSARecv() not ready");
return NGX_AGAIN;
}
rev->error = 1;
ngx_connection_error(c, err, "WSARecv() failed");
return NGX_ERROR;
}
if (bytes < size) {
rev->ready = 0;
}
if (bytes == 0) {
rev->eof = 1;
}
return bytes;
}
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