# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1378816185 -10800
# Node ID 798df5111b560846b8c1213ef52bc5b686cfa3d8
# Parent  be15ba7c5483fd0cc41a867e47bfe367c3d41799
moving slowly onwards

diff -r be15ba7c5483 -r 798df5111b56 src/chunk.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/chunk.cc	Tue Sep 10 15:29:45 2013 +0300
@@ -0,0 +1,32 @@
+#include "goat3d.h"
+#include "chunk.h"
+
+ChunkHeader chunk_header(int id)
+{
+	ChunkHeader hdr;
+	hdr.id = id;
+	hdr.size = sizeof hdr;
+	return hdr;
+}
+
+bool write_chunk_header(const ChunkHeader *hdr, goat3d_io *io)
+{
+	io->seek(-hdr->size, SEEK_CUR, io->cls);
+	if(io->write(hdr, sizeof *hdr, io->cls) < (ssize_t)sizeof *hdr) {
+		return false;
+	}
+	return true;
+}
+
+bool read_chunk_header(ChunkHeader *hdr, goat3d_io *io)
+{
+	if(io->read(hdr, sizeof *hdr, io->cls) < (ssize_t)sizeof *hdr) {
+		return false;
+	}
+	return true;
+}
+
+void skip_chunk(const ChunkHeader *hdr, goat3d_io *io)
+{
+	io->seek(hdr->size - sizeof *hdr, SEEK_CUR, io->cls);
+}
diff -r be15ba7c5483 -r 798df5111b56 src/chunk.h
--- a/src/chunk.h	Mon Aug 26 06:08:40 2013 +0300
+++ b/src/chunk.h	Tue Sep 10 15:29:45 2013 +0300
@@ -115,5 +115,10 @@
 };
 
 
+ChunkHeader chunk_header(int id);
+bool write_chunk_header(const ChunkHeader *hdr, goat3d_io *io);
+bool read_chunk_header(ChunkHeader *hdr, goat3d_io *io);
+void skip_chunk(const ChunkHeader *hdr, goat3d_io *io);
+
 
 #endif	// CHUNK_H_
diff -r be15ba7c5483 -r 798df5111b56 src/goat3d.h
--- a/src/goat3d.h	Mon Aug 26 06:08:40 2013 +0300
+++ b/src/goat3d.h	Tue Sep 10 15:29:45 2013 +0300
@@ -10,7 +10,7 @@
 	void *cls;	/* closure data */
 
 	long (*read)(void *buf, size_t bytes, void *uptr);
-	long (*write)(void *buf, size_t bytes, void *uptr);
+	long (*write)(const void *buf, size_t bytes, void *uptr);
 	long (*seek)(long offs, int whence, void *uptr);
 };