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#include <ngx_config.h>
#include <ngx_core.h>
ngx_hunk_t *ngx_create_temp_hunk(ngx_pool_t *pool, int size,
int before, int after)
{
ngx_hunk_t *h;
ngx_test_null(h, ngx_palloc(pool, sizeof(ngx_hunk_t)), NULL);
ngx_test_null(h->pre_start, ngx_palloc(pool, size + before + after), NULL);
h->start = h->pos = h->last = h->pre_start + before;
h->file_pos = h->file_last = 0;
h->end = h->last + size;
h->post_end = h->end + after;
h->type = NGX_HUNK_TEMP|NGX_HUNK_IN_MEMORY;
h->file = NULL;
h->shadow = NULL;
h->tag = 0;
return h;
}
ngx_hunk_t *ngx_create_hunk_before(ngx_pool_t *pool, ngx_hunk_t *hunk, int size)
{
ngx_hunk_t *h;
ngx_test_null(h, ngx_palloc(pool, sizeof(ngx_hunk_t)), NULL);
if (hunk->type & NGX_HUNK_TEMP && hunk->pos - hunk->pre_start >= size) {
/* keep hunk->start unchanged - used in restore */
h->pre_start = hunk->pre_start;
h->end = h->post_end = hunk->pre_start = hunk->pos;
h->start = h->pos = h->last = h->end - size;
h->file_pos = h->file_last = 0;
h->type = NGX_HUNK_TEMP|NGX_HUNK_IN_MEMORY;
h->file = NULL;
h->shadow = NULL;
h->tag = 0;
} else {
ngx_test_null(h->pre_start, ngx_palloc(pool, size), NULL);
h->start = h->pos = h->last = h->pre_start;
h->end = h->post_end = h->start + size;
h->file_pos = h->file_last = 0;
h->type = NGX_HUNK_TEMP|NGX_HUNK_IN_MEMORY;
h->file = NULL;
h->shadow = NULL;
h->tag = 0;
}
return h;
}
ngx_hunk_t *ngx_create_hunk_after(ngx_pool_t *pool, ngx_hunk_t *hunk, int size)
{
ngx_hunk_t *h;
ngx_test_null(h, ngx_palloc(pool, sizeof(ngx_hunk_t)), NULL);
if (hunk->type & NGX_HUNK_TEMP
&& hunk->last == hunk->end
&& hunk->post_end - hunk->end >= size)
{
h->post_end = hunk->post_end;
h->pre_start = h->start = h->pos = h->last = hunk->post_end =
hunk->last;
h->file_pos = h->file_last = 0;
h->type = NGX_HUNK_TEMP|NGX_HUNK_IN_MEMORY;
h->file = NULL;
h->shadow = NULL;
h->tag = 0;
} else {
ngx_test_null(h->pre_start, ngx_palloc(pool, size), NULL);
h->start = h->pos = h->last = h->pre_start;
h->end = h->post_end = h->start + size;
h->file_pos = h->file_last = 0;
h->type = NGX_HUNK_TEMP|NGX_HUNK_IN_MEMORY;
h->file = NULL;
h->shadow = NULL;
h->tag = 0;
}
return h;
}
void ngx_chain_update_chains(ngx_chain_t **free, ngx_chain_t **busy,
ngx_chain_t **out)
{
ngx_chain_t *te;
if (*busy == NULL) {
*busy = *out;
} else {
for (te = *busy; /* void */ ; te = te->next) {
if (te->next == NULL) {
te->next = *out;
break;
}
}
}
*out = NULL;
while (*busy) {
if ((*busy)->hunk->pos != (*busy)->hunk->last) {
break;
}
#if (HAVE_WRITE_ZEROCOPY)
if ((*busy)->hunk->type & NGX_HUNK_ZEROCOPY_BUSY) {
break;
}
#endif
(*busy)->hunk->pos = (*busy)->hunk->last = (*busy)->hunk->start;
te = *busy;
*busy = (*busy)->next;
te->next = *free;
*free = te;
}
}
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