MINOR: htx: Add function to add an HTX block just before another one
The function htx_add_data_before() can be used to add an HTX block before
another one. For instance, it could be used to add some data before the
end-of-message marker.
diff --git a/include/proto/htx.h b/include/proto/htx.h
index 2f7aaf7..7db2059 100644
--- a/include/proto/htx.h
+++ b/include/proto/htx.h
@@ -57,6 +57,7 @@
struct htx_blk *htx_add_data(struct htx *htx, const struct ist data);
struct htx_blk *htx_add_trailer(struct htx *htx, const struct ist tlr);
struct htx_blk *htx_add_oob(struct htx *htx, const struct ist oob);
+struct htx_blk *htx_add_data_before(struct htx *htx, const struct htx_blk *ref, const struct ist data);
int htx_reqline_to_str(const union htx_sl *sl, struct buffer *chk);
int htx_stline_to_str(const union htx_sl *sl, struct buffer *chk);
diff --git a/src/htx.c b/src/htx.c
index f042143..0c96467 100644
--- a/src/htx.c
+++ b/src/htx.c
@@ -788,6 +788,37 @@
return blk;
}
+struct htx_blk *htx_add_data_before(struct htx *htx, const struct htx_blk *ref,
+ const struct ist data)
+{
+ struct htx_blk *blk;
+ int32_t prev;
+
+ /* FIXME: check data.len (< 256MB) */
+ blk = htx_add_blk(htx, HTX_BLK_DATA, data.len);
+ if (!blk)
+ return NULL;
+
+ blk->info += data.len;
+ memcpy(htx_get_blk_ptr(htx, blk), data.ptr, data.len);
+
+ for (prev = htx_get_prev(htx, htx->tail); prev != -1; prev = htx_get_prev(htx, prev)) {
+ struct htx_blk *pblk = htx_get_blk(htx, prev);
+
+ /* Swap .addr and .info fields */
+ blk->addr ^= pblk->addr; pblk->addr ^= blk->addr; blk->addr ^= pblk->addr;
+ blk->info ^= pblk->info; pblk->info ^= blk->info; blk->info ^= pblk->info;
+
+ if (blk->addr == pblk->addr)
+ blk->addr += htx_get_blksz(pblk);
+ htx->front = prev;
+
+ if (pblk == ref)
+ break;
+ blk = pblk;
+ }
+ return blk;
+}
/* Appends the string representation of the request line block <blk> to the
* chunk <chk>. It returns 1 if data are successfully appended, otherwise it