diff -r 4fbfac557df8 -r 814d51173f20 src/buffer.c
--- a/src/buffer.c	Mon Apr 18 17:26:21 2022 +0200
+++ b/src/buffer.c	Sun Apr 24 14:54:50 2022 +0200
@@ -36,7 +36,7 @@
         CxBuffer *buffer,
         void *space,
         size_t capacity,
-        CxAllocator *allocator,
+        CxAllocator const *allocator,
         int flags
 ) {
     buffer->allocator = allocator;
@@ -65,33 +65,6 @@
     }
 }
 
-CxBuffer *cxBufferExtract(
-        CxBuffer *src,
-        size_t start,
-        size_t length,
-        int flags
-) {
-    if (src->size == 0 || length == 0 ||
-        ((size_t) -1) - start < length || start + length > src->capacity) {
-        return NULL;
-    }
-
-    CxBuffer *dst = (CxBuffer *) malloc(sizeof(cx_buffer_s));
-    if (dst) {
-        dst->bytes = malloc(length);
-        if (!dst->bytes) {
-            free(dst);
-            return NULL;
-        }
-        dst->capacity = length;
-        dst->size = length;
-        dst->flags = flags | CX_BUFFER_FREE_CONTENTS;
-        dst->pos = 0;
-        memcpy(dst->bytes, src->bytes + start, length);
-    }
-    return dst;
-}
-
 int cxBufferSeek(
         CxBuffer *buffer,
         off_t offset,
@@ -128,7 +101,13 @@
 
 }
 
-int cxBufferEof(CxBuffer *buffer) {
+void cxBufferClear(CxBuffer *buffer) {
+    memset(buffer->bytes, 0, buffer->size);
+    buffer->size = 0;
+    buffer->pos = 0;
+}
+
+int cxBufferEof(CxBuffer const *buffer) {
     return buffer->pos >= buffer->size;
 }