blob: c3783c44670404b37242d85e30ccf9515b79032e [file] [log] [blame]
/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
ngx_buf_t *
ngx_create_temp_buf(ngx_pool_t *pool, size_t size)
{
ngx_buf_t *b;
b = ngx_calloc_buf(pool);
if (b == NULL) {
return NULL;
}
b->start = ngx_palloc(pool, size);
if (b->start == NULL) {
return NULL;
}
/*
* set by ngx_calloc_buf():
*
* b->file_pos = 0;
* b->file_last = 0;
* b->file = NULL;
* b->shadow = NULL;
* b->tag = 0;
* and flags
*/
b->pos = b->start;
b->last = b->start;
b->end = b->last + size;
b->temporary = 1;
return b;
}
ngx_chain_t *
ngx_alloc_chain_link(ngx_pool_t *pool)
{
ngx_chain_t *cl;
cl = pool->chain;
if (cl) {
pool->chain = cl->next;
return cl;
}
cl = ngx_palloc(pool, sizeof(ngx_chain_t));
if (cl == NULL) {
return NULL;
}
return cl;
}
ngx_chain_t *
ngx_create_chain_of_bufs(ngx_pool_t *pool, ngx_bufs_t *bufs)
{
u_char *p;
ngx_int_t i;
ngx_buf_t *b;
ngx_chain_t *chain, *cl, **ll;
p = ngx_palloc(pool, bufs->num * bufs->size);
if (p == NULL) {
return NULL;
}
ll = &chain;
for (i = 0; i < bufs->num; i++) {
b = ngx_calloc_buf(pool);
if (b == NULL) {
return NULL;
}
/*
* set by ngx_calloc_buf():
*
* b->file_pos = 0;
* b->file_last = 0;
* b->file = NULL;
* b->shadow = NULL;
* b->tag = 0;
* and flags
*
*/
b->pos = p;
b->last = p;
b->temporary = 1;
b->start = p;
p += bufs->size;
b->end = p;
cl = ngx_alloc_chain_link(pool);
if (cl == NULL) {
return NULL;
}
cl->buf = b;
*ll = cl;
ll = &cl->next;
}
*ll = NULL;
return chain;
}
ngx_int_t
ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, ngx_chain_t *in)
{
ngx_chain_t *cl, **ll;
ll = chain;
for (cl = *chain; cl; cl = cl->next) {
ll = &cl->next;
}
while (in) {
cl = ngx_alloc_chain_link(pool);
if (cl == NULL) {
*ll = NULL;
return NGX_ERROR;
}
cl->buf = in->buf;
*ll = cl;
ll = &cl->next;
in = in->next;
}
*ll = NULL;
return NGX_OK;
}
ngx_chain_t *
ngx_chain_get_free_buf(ngx_pool_t *p, ngx_chain_t **free)
{
ngx_chain_t *cl;
if (*free) {
cl = *free;
*free = cl->next;
cl->next = NULL;
return cl;
}
cl = ngx_alloc_chain_link(p);
if (cl == NULL) {
return NULL;
}
cl->buf = ngx_calloc_buf(p);
if (cl->buf == NULL) {
return NULL;
}
cl->next = NULL;
return cl;
}
void
ngx_chain_update_chains(ngx_pool_t *p, ngx_chain_t **free, ngx_chain_t **busy,
ngx_chain_t **out, ngx_buf_tag_t tag)
{
ngx_chain_t *cl;
if (*out) {
if (*busy == NULL) {
*busy = *out;
} else {
for (cl = *busy; cl->next; cl = cl->next) { /* void */ }
cl->next = *out;
}
*out = NULL;
}
while (*busy) {
cl = *busy;
if (ngx_buf_size(cl->buf) != 0) {
break;
}
if (cl->buf->tag != tag) {
*busy = cl->next;
ngx_free_chain(p, cl);
continue;
}
cl->buf->pos = cl->buf->start;
cl->buf->last = cl->buf->start;
*busy = cl->next;
cl->next = *free;
*free = cl;
}
}
off_t
ngx_chain_coalesce_file(ngx_chain_t **in, off_t limit)
{
off_t total, size, aligned, fprev;
ngx_fd_t fd;
ngx_chain_t *cl;
total = 0;
cl = *in;
fd = cl->buf->file->fd;
do {
size = cl->buf->file_last - cl->buf->file_pos;
if (size > limit - total) {
size = limit - total;
aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
& ~((off_t) ngx_pagesize - 1);
if (aligned <= cl->buf->file_last) {
size = aligned - cl->buf->file_pos;
}
total += size;
break;
}
total += size;
fprev = cl->buf->file_pos + size;
cl = cl->next;
} while (cl
&& cl->buf->in_file
&& total < limit
&& fd == cl->buf->file->fd
&& fprev == cl->buf->file_pos);
*in = cl;
return total;
}
ngx_chain_t *
ngx_chain_update_sent(ngx_chain_t *in, off_t sent)
{
off_t size;
for ( /* void */ ; in; in = in->next) {
if (ngx_buf_special(in->buf)) {
continue;
}
if (sent == 0) {
break;
}
size = ngx_buf_size(in->buf);
if (sent >= size) {
sent -= size;
if (ngx_buf_in_memory(in->buf)) {
in->buf->pos = in->buf->last;
}
if (in->buf->in_file) {
in->buf->file_pos = in->buf->file_last;
}
continue;
}
if (ngx_buf_in_memory(in->buf)) {
in->buf->pos += (size_t) sent;
}
if (in->buf->in_file) {
in->buf->file_pos += sent;
}
break;
}
return in;
}