MINOR: compression: Store algo and type for both request and response

Make provision for being able to store both compression algorithms and
content-types to compress for both requests and responses. For now only
the responses one are used.
diff --git a/include/haproxy/compression-t.h b/include/haproxy/compression-t.h
index 6851103..346cf2e 100644
--- a/include/haproxy/compression-t.h
+++ b/include/haproxy/compression-t.h
@@ -43,8 +43,10 @@
 
 #define COMP_FL_OFFLOAD		0x00000001 /* Compression offload */
 struct comp {
-	struct comp_algo *algos;
-	struct comp_type *types;
+	struct comp_algo *algos_res; /* Algos available for response */
+	struct comp_algo *algo_req;  /* Algo to use for request */
+	struct comp_type *types_req; /* Types to be compressed for requests */
+	struct comp_type *types_res; /* Types to be compressed for responses */
 	unsigned int flags;
 };
 
diff --git a/include/haproxy/compression.h b/include/haproxy/compression.h
index ba2bdab..851ea23 100644
--- a/include/haproxy/compression.h
+++ b/include/haproxy/compression.h
@@ -27,8 +27,8 @@
 
 extern unsigned int compress_min_idle;
 
-int comp_append_type(struct comp *comp, const char *type);
-int comp_append_algo(struct comp *comp, const char *algo);
+int comp_append_type(struct comp_type **types, const char *type);
+int comp_append_algo(struct comp_algo **algos, const char *algo);
 
 #ifdef USE_ZLIB
 extern long zlib_used_memory;
diff --git a/src/compression.c b/src/compression.c
index 3ce2a60..7a8a219 100644
--- a/src/compression.c
+++ b/src/compression.c
@@ -110,7 +110,7 @@
  * Add a content-type in the configuration
  * Returns 0 in case of success, 1 in case of allocation failure.
  */
-int comp_append_type(struct comp *comp, const char *type)
+int comp_append_type(struct comp_type **types, const char *type)
 {
 	struct comp_type *comp_type;
 
@@ -119,8 +119,8 @@
 		return 1;
 	comp_type->name_len = strlen(type);
 	comp_type->name = strdup(type);
-	comp_type->next = comp->types;
-	comp->types = comp_type;
+	comp_type->next = *types;
+	*types = comp_type;
 	return 0;
 }
 
@@ -129,7 +129,7 @@
  * Returns 0 in case of success, -1 if the <algo> is unmanaged, 1 in case of
  * allocation failure.
  */
-int comp_append_algo(struct comp *comp, const char *algo)
+int comp_append_algo(struct comp_algo **algos, const char *algo)
 {
 	struct comp_algo *comp_algo;
 	int i;
@@ -140,8 +140,8 @@
 			if (!comp_algo)
 				return 1;
 			memmove(comp_algo, &comp_algos[i], sizeof(struct comp_algo));
-			comp_algo->next = comp->algos;
-			comp->algos = comp_algo;
+			comp_algo->next = *algos;
+			*algos = comp_algo;
 			return 0;
 		}
 	}
diff --git a/src/flt_http_comp.c b/src/flt_http_comp.c
index ad2b77c..8c56d0a 100644
--- a/src/flt_http_comp.c
+++ b/src/flt_http_comp.c
@@ -415,8 +415,8 @@
 	}
 
 	/* search for the algo in the backend in priority or the frontend */
-	if ((s->be->comp && (comp_algo_back = s->be->comp->algos)) ||
-	    (strm_fe(s)->comp && (comp_algo_back = strm_fe(s)->comp->algos))) {
+	if ((s->be->comp && (comp_algo_back = s->be->comp->algos_res)) ||
+	    (strm_fe(s)->comp && (comp_algo_back = strm_fe(s)->comp->algos_res))) {
 		int best_q = 0;
 
 		ctx.blk = NULL;
@@ -485,8 +485,8 @@
 	}
 
 	/* identity is implicit does not require headers */
-	if ((s->be->comp && (comp_algo_back = s->be->comp->algos)) ||
-	    (strm_fe(s)->comp && (comp_algo_back = strm_fe(s)->comp->algos))) {
+	if ((s->be->comp && (comp_algo_back = s->be->comp->algos_res)) ||
+	    (strm_fe(s)->comp && (comp_algo_back = strm_fe(s)->comp->algos_res))) {
 		for (comp_algo = comp_algo_back; comp_algo; comp_algo = comp_algo->next) {
 			if (comp_algo->cfg_name_len == 8 && memcmp(comp_algo->cfg_name, "identity", 8) == 0) {
 				st->comp_algo[COMP_DIR_RES] = comp_algo;
@@ -571,8 +571,8 @@
 		if (ctx.value.len >= 9 && strncasecmp("multipart", ctx.value.ptr, 9) == 0)
 			goto fail;
 
-		if ((s->be->comp && (comp_type = s->be->comp->types)) ||
-		    (strm_fe(s)->comp && (comp_type = strm_fe(s)->comp->types))) {
+		if ((s->be->comp && (comp_type = s->be->comp->types_res)) ||
+		    (strm_fe(s)->comp && (comp_type = strm_fe(s)->comp->types_res))) {
 			for (; comp_type; comp_type = comp_type->next) {
 				if (ctx.value.len >= comp_type->name_len &&
 				    strncasecmp(ctx.value.ptr, comp_type->name, comp_type->name_len) == 0)
@@ -585,8 +585,8 @@
 		}
 	}
 	else { /* no content-type header */
-		if ((s->be->comp && s->be->comp->types) ||
-		    (strm_fe(s)->comp && strm_fe(s)->comp->types))
+		if ((s->be->comp && s->be->comp->types_res) ||
+		    (strm_fe(s)->comp && strm_fe(s)->comp->types_res))
 			goto fail; /* a content-type was required */
 	}
 
@@ -674,7 +674,7 @@
 	else
 		comp = proxy->comp;
 
-	if (strcmp(args[1], "algo") == 0) {
+	if (strcmp(args[1], "algo") == 0 || strcmp(args[1], "algo-res") == 0) {
 		struct comp_ctx *ctx;
 		int              cur_arg = 2;
 
@@ -685,7 +685,7 @@
 			goto end;
 		}
 		while (*(args[cur_arg])) {
-			int retval = comp_append_algo(comp, args[cur_arg]);
+			int retval = comp_append_algo(&comp->algos_res, args[cur_arg]);
 			if (retval) {
 				if (retval < 0)
 					memprintf(err, "'%s' : '%s' is not a supported algorithm.",
@@ -697,8 +697,8 @@
 				goto end;
 			}
 
-			if (proxy->comp->algos->init(&ctx, 9) == 0)
-				proxy->comp->algos->end(&ctx);
+			if (proxy->comp->algos_res->init(&ctx, 9) == 0)
+				proxy->comp->algos_res->end(&ctx);
 			else {
 				memprintf(err, "'%s' : Can't init '%s' algorithm.",
 					  args[0], args[cur_arg]);
@@ -717,7 +717,7 @@
 		}
 		comp->flags |= COMP_FL_OFFLOAD;
 	}
-	else if (strcmp(args[1], "type") == 0) {
+	else if (strcmp(args[1], "type") == 0 || strcmp(args[1], "type-res") == 0) {
 		int cur_arg = 2;
 
 		if (!*args[cur_arg]) {
@@ -726,7 +726,7 @@
 			goto end;
 		}
 		while (*(args[cur_arg])) {
-			if (comp_append_type(comp, args[cur_arg])) {
+			if (comp_append_type(&comp->types_res, args[cur_arg])) {
 				memprintf(err, "'%s': out of memory.", args[0]);
 				ret = -1;
 				goto end;
diff --git a/src/proxy.c b/src/proxy.c
index 8d4de56..a025e18 100644
--- a/src/proxy.c
+++ b/src/proxy.c
@@ -1901,8 +1901,10 @@
 			memprintf(errmsg, "proxy '%s': out of memory for default compression options", curproxy->id);
 			return 1;
 		}
-		curproxy->comp->algos = defproxy->comp->algos;
-		curproxy->comp->types = defproxy->comp->types;
+		curproxy->comp->algos_res = defproxy->comp->algos_res;
+		curproxy->comp->algo_req = defproxy->comp->algo_req;
+		curproxy->comp->types_res = defproxy->comp->types_res;
+		curproxy->comp->types_req = defproxy->comp->types_req;
 	}
 
 	if (defproxy->check_path)