replace ec3_reader and ec3_writer with a unified image and tag io interface

src/chunk-table.h

@@ -0,0 +1,62 @@
+#ifndef CHUNK_TABLE_H_
+#define CHUNK_TABLE_H_
+
+#include "bin.h"
+
+#include <blue/core/btree.h>
+#include <blue/core/hash.h>
+#include <stdio.h>
+
+struct ec3_tag_reader;
+struct ec3_tag_writer;
+
+enum chunk_table_mode {
+	CHUNK_TABLE_READ,
+	CHUNK_TABLE_WRITE,
+};
+
+struct chunk_table {
+	enum chunk_table_mode tab_mode;
+	unsigned int tab_cluster_size;
+	b_btree tab_cache;
+
+	union {
+		struct {
+			struct ec3_tag_reader *ctab;
+			struct ec3_tag_reader *cdat;
+		} tab_read;
+
+		struct {
+			struct ec3_tag_writer *ctab;
+			struct ec3_tag_writer *cdat;
+		} tab_write;
+	};
+};
+
+extern enum ec3_status chunk_table_init_read(
+	struct ec3_tag_reader *ctab,
+	struct ec3_tag_reader *cdat,
+	size_t cluster_size,
+	struct chunk_table *tab);
+extern enum ec3_status chunk_table_init_write(
+	struct ec3_tag_writer *ctab,
+	struct ec3_tag_writer *cdat,
+	size_t cluster_size,
+	struct chunk_table *tab);
+extern void chunk_table_finish(struct chunk_table *tab);
+
+extern enum ec3_status chunk_table_get(
+	struct chunk_table *tab,
+	ec3_chunk_id id,
+	void *out_data,
+	size_t *out_len);
+
+extern enum ec3_status chunk_table_put(
+	struct chunk_table *tab,
+	const void *data,
+	size_t len,
+	ec3_chunk_id out_id);
+
+extern size_t chunk_table_bytes_per_chunk(struct chunk_table *tab);
+
+#endif