fx: add functions for hashing wstr and generic buffers

fx/hash/hash.c

@@ -40,8 +40,8 @@ static const struct fx_hash_function_ops *hash_functions[] = {
 	[FX_HASH_SHAKE128] = &z__fx_shake128_ops,
 	[FX_HASH_SHAKE256] = &z__fx_shake256_ops,
 };
-static const size_t nr_hash_functions
-	= sizeof hash_functions / sizeof hash_functions[0];
+static const size_t nr_hash_functions = sizeof hash_functions
+                                      / sizeof hash_functions[0];
 
 uint64_t fx_hash_cstr(const char *s)
 {
@@ -66,6 +66,33 @@ uint64_t fx_hash_cstr_ex(const char *s, size_t *len)
 	return hash;
 }
 
+uint64_t fx_hash_wstr(const fx_wchar *s)
+{
+	uint64_t hash = FNV1_OFFSET_BASIS;
+	size_t i = 0;
+
+	for (i = 0; s[i]; i++) {
+		hash ^= s[i];
+		hash *= FNV1_PRIME;
+	}
+
+	return hash;
+}
+
+uint64_t fx_hash_buffer(const void *p, size_t len)
+{
+	const char *s = p;
+	uint64_t hash = FNV1_OFFSET_BASIS;
+	size_t i = 0;
+
+	for (i = 0; i < len; i++) {
+		hash ^= s[i];
+		hash *= FNV1_PRIME;
+	}
+
+	return hash;
+}
+
 enum fx_status fx_hash_ctx_init(
 	struct fx_hash_ctx *ctx,
 	enum fx_hash_function func)

fx/include/fx/hash.h

@@ -1,6 +1,7 @@
 #ifndef FX_CORE_HASH_H_
 #define FX_CORE_HASH_H_
 
+#include <fx/encoding.h>
 #include <fx/misc.h>
 #include <fx/status.h>
 #include <stddef.h>
@@ -99,15 +100,16 @@ typedef struct fx_hash_ctx {
 } fx_hash_ctx;
 
 FX_API uint64_t fx_hash_cstr(const char *s);
+FX_API uint64_t fx_hash_wstr(const fx_wchar *s);
 FX_API uint64_t fx_hash_cstr_ex(const char *s, size_t *len);
+FX_API uint64_t fx_hash_buffer(const void *s, size_t len);
 
 FX_API fx_status fx_hash_ctx_init(fx_hash_ctx *ctx, fx_hash_function func);
 FX_API fx_status fx_hash_ctx_reset(fx_hash_ctx *ctx);
 FX_API fx_status
 fx_hash_ctx_update(fx_hash_ctx *ctx, const void *p, size_t len);
-FX_API fx_status fx_hash_ctx_update_rope(
-	fx_hash_ctx *ctx,
-	const struct fx_rope *rope);
+FX_API fx_status
+fx_hash_ctx_update_rope(fx_hash_ctx *ctx, const struct fx_rope *rope);
 FX_API fx_status
 fx_hash_ctx_finish(fx_hash_ctx *ctx, void *out_digest, size_t out_max);