From 21832851af1d601129c5fb7a8b3f7892656b10db Mon Sep 17 00:00:00 2001
From: Jef Driesen <jefdriesen@users.sourceforge.net>
Date: Mon, 16 Nov 2009 08:14:19 +0000
Subject: [PATCH] Add a function to slice the buffer.

---
 src/buffer.c                | 16 ++++++++++++++++
 src/buffer.h                |  3 +++
 src/libdivecomputer.symbols |  1 +
 3 files changed, 20 insertions(+)

diff --git a/src/buffer.c b/src/buffer.c
index daefb5b..a374017 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -231,6 +231,22 @@ dc_buffer_prepend (dc_buffer_t *buffer, const unsigned char data[], size_t size)
 }
 
 
+int
+dc_buffer_slice (dc_buffer_t *buffer, size_t offset, size_t size)
+{
+	if (buffer == NULL)
+		return 0;
+
+	if (offset + size >= buffer->size)
+		return 0;
+
+	buffer->offset += offset;
+	buffer->size = size;
+
+	return 1;
+}
+
+
 size_t
 dc_buffer_get_size (dc_buffer_t *buffer)
 {
diff --git a/src/buffer.h b/src/buffer.h
index a26389f..dd97a87 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -49,6 +49,9 @@ dc_buffer_append (dc_buffer_t *buffer, const unsigned char data[], size_t size);
 int
 dc_buffer_prepend (dc_buffer_t *buffer, const unsigned char data[], size_t size);
 
+int
+dc_buffer_slice (dc_buffer_t *buffer, size_t offset, size_t size);
+
 size_t
 dc_buffer_get_size (dc_buffer_t *buffer);
 
diff --git a/src/libdivecomputer.symbols b/src/libdivecomputer.symbols
index f480291..ab5a569 100644
--- a/src/libdivecomputer.symbols
+++ b/src/libdivecomputer.symbols
@@ -5,6 +5,7 @@ dc_buffer_reserve
 dc_buffer_resize
 dc_buffer_append
 dc_buffer_prepend
+dc_buffer_slice
 dc_buffer_get_size
 dc_buffer_get_data