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#include <ngx_config.h>
#include <ngx_hunk.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);
#if !(HAVE_OFFSET_EQUAL_PTR)
h->pos.file = h->last.file = 0;
#endif
ngx_test_null(h->pre_start, ngx_palloc(pool, size + before + after), NULL);
h->start = h->pos.mem = h->last.mem = h->pre_start + before;
h->end = h->last.mem + size;
h->post_end = h->end + after;
h->type = NGX_HUNK_TEMP;
h->tag = 0;
h->file = NULL;
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 !(HAVE_OFFSET_EQUAL_PTR)
h->pos.file = h->last.file = 0;
#endif
if (hunk->type & NGX_HUNK_TEMP && hunk->pos.mem - 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.mem;
h->start = h->pos.mem = h->last.mem = h->end - size;
h->type = NGX_HUNK_TEMP;
h->tag = 0;
h->file = NULL;
} else {
ngx_test_null(h->pre_start, ngx_palloc(pool, size), NULL);
h->start = h->pos.mem = h->last.mem = h->pre_start;
h->end = h->post_end = h->start + size;
h->type = NGX_HUNK_TEMP;
h->tag = 0;
h->file = NULL;
}
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 !(HAVE_OFFSET_EQUAL_PTR)
h->pos.file = h->last.file = 0;
#endif
if (hunk->type & NGX_HUNK_TEMP
&& hunk->last.mem == hunk->end
&& hunk->post_end - hunk->end >= size)
{
h->post_end = hunk->post_end;
h->pre_start = h->start = h->pos.mem = h->last.mem = hunk->post_end =
hunk->last.mem;
h->type = NGX_HUNK_TEMP;
h->tag = 0;
h->file = NULL;
} else {
ngx_test_null(h->pre_start, ngx_palloc(pool, size), NULL);
h->start = h->pos.mem = h->last.mem = h->pre_start;
h->end = h->post_end = h->start + size;
h->type = NGX_HUNK_TEMP;
h->tag = 0;
h->file = NULL;
}
return h;
}
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