Improved API. hash_file procs now just take a file handle instead of a path

core/crypto/util/util.odin

@@ -11,6 +11,7 @@ package util
 */
 
 import "core:mem"
+import "core:os"
 
 // @note(bp): this can replace the other two
 cast_slice :: #force_inline proc "contextless" ($D: typeid/[]$DE, src: $S/[]$SE) -> D {
@@ -141,4 +142,29 @@ XOR_BUF :: #force_inline proc "contextless" (input, output: []byte) {
     for i := 0; i < len(input); i += 1 {
         output[i] ~= input[i]
     }
+}
+
+// Taken from core:os and changed to just take a file handle
+read_entire_file :: proc(fd: os.Handle, allocator := context.allocator) -> (data: []byte, success: bool) {
+    length: i64
+    err: os.Errno
+    if length, err = os.file_size(fd); err != 0 {
+        return nil, false
+    }
+
+    if length <= 0 {
+        return nil, true
+    }
+
+    data = make([]byte, int(length), allocator)
+    if data == nil {
+        return nil, false
+    }
+
+    bytes_read, read_err := os.read(fd, data)
+    if read_err != os.ERROR_NONE {
+        delete(data)
+        return nil, false
+    }
+    return data[:bytes_read], true
 }