From b685c70fc1fbfb667c0ffa264c24c707e600bcea Mon Sep 17 00:00:00 2001
From: Enno Boland <g@s01.de>
Date: Tue, 15 Aug 2023 09:31:05 +0200
Subject: [PATCH] Revert "buffer: remove unused _drain method"

This reverts commit b3f42f994ca6fc9e1a1c67a0837d66a571de7964.
---
 include/sqsh_primitive_private.h | 13 +++++++++++++
 lib/primitive/buffer.c           |  5 +++++
 2 files changed, 18 insertions(+)

diff --git a/include/sqsh_primitive_private.h b/include/sqsh_primitive_private.h
index ebd0fc763..a46955aa9 100644
--- a/include/sqsh_primitive_private.h
+++ b/include/sqsh_primitive_private.h
@@ -137,6 +137,19 @@ SQSH_NO_EXPORT SQSH_NO_UNUSED int sqsh__buffer_append(
 SQSH_NO_EXPORT SQSH_NO_UNUSED int
 sqsh__buffer_move(struct SqshBuffer *buffer, struct SqshBuffer *source);
 
+/**
+ * @internal
+ * @memberof SqshBuffer
+ * @brief resets the buffer size to 0.
+ *
+ * This does not free the memory allocated by the buffer so that
+ * the buffer can be reused.
+ *
+ * @param[in,out] buffer The SqshBuffer to drain.
+ */
+
+void sqsh__buffer_drain(struct SqshBuffer *buffer);
+
 /**
  * @internal
  * @memberof SqshBuffer
diff --git a/lib/primitive/buffer.c b/lib/primitive/buffer.c
index 3ddeb5407..c7cc11c03 100644
--- a/lib/primitive/buffer.c
+++ b/lib/primitive/buffer.c
@@ -114,6 +114,11 @@ sqsh__buffer_move(struct SqshBuffer *buffer, struct SqshBuffer *source) {
 	return 0;
 }
 
+void
+sqsh__buffer_drain(struct SqshBuffer *buffer) {
+	buffer->size = 0;
+}
+
 const uint8_t *
 sqsh__buffer_data(const struct SqshBuffer *buffer) {
 	return buffer->data;