initial commit

SQUASHFS/squashfs-tools-4.4/squashfs-tools/compressor.h

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+#ifndef COMPRESSOR_H
+#define COMPRESSOR_H
+/*
+ *
+ * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014
+ * Phillip Lougher <phillip@squashfs.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * compressor.h
+ */
+
+struct compressor {
+	int id;
+	char *name;
+	int supported;
+	int (*init)(void **, int, int);
+	int (*compress)(void *, void *, void *, int, int, int *);
+	int (*uncompress)(void *, void *, int, int, int *);
+	int (*options)(char **, int);
+	int (*options_post)(int);
+	void *(*dump_options)(int, int *);
+	int (*extract_options)(int, void *, int);
+	int (*check_options)(int, void *, int);
+	void (*display_options)(void *, int);
+	void (*usage)();
+};
+
+extern struct compressor *lookup_compressor(char *);
+extern struct compressor *lookup_compressor_id(int);
+extern void display_compressors(char *, char *);
+extern void display_compressor_usage(char *);
+
+static inline int compressor_init(struct compressor *comp, void **stream,
+	int block_size, int datablock)
+{
+	if(comp->init == NULL)
+		return 0;
+	return comp->init(stream, block_size, datablock);
+}
+
+
+static inline int compressor_compress(struct compressor *comp, void *strm,
+	void *dest, void *src, int size, int block_size, int *error)
+{
+	return comp->compress(strm, dest, src, size, block_size, error);
+}
+
+
+static inline int compressor_uncompress(struct compressor *comp, void *dest,
+	void *src, int size, int block_size, int *error)
+{
+	return comp->uncompress(dest, src, size, block_size, error);
+}
+
+
+/*
+ * For the following functions please see the lzo, lz4 or xz
+ * compressors for commented examples of how they are used.
+ */
+static inline int compressor_options(struct compressor *comp, char *argv[],
+	int argc)
+{
+	if(comp->options == NULL)
+		return -1;
+
+	return comp->options(argv, argc);
+}
+
+
+static inline int compressor_options_post(struct compressor *comp, int block_size)
+{
+	if(comp->options_post == NULL)
+		return 0;
+	return comp->options_post(block_size);
+}
+
+
+static inline void *compressor_dump_options(struct compressor *comp,
+	int block_size, int *size)
+{
+	if(comp->dump_options == NULL)
+		return NULL;
+	return comp->dump_options(block_size, size);
+}
+
+
+static inline int compressor_extract_options(struct compressor *comp,
+	int block_size, void *buffer, int size)
+{
+	if(comp->extract_options == NULL)
+		return size ? -1 : 0;
+	return comp->extract_options(block_size, buffer, size);
+}
+
+
+static inline int compressor_check_options(struct compressor *comp,
+	int block_size, void *buffer, int size)
+{
+	if(comp->check_options == NULL)
+		return 0;
+	return comp->check_options(block_size, buffer, size);
+}
+
+
+static inline void compressor_display_options(struct compressor *comp,
+	void *buffer, int size)
+{
+	if(comp->display_options != NULL)
+		comp->display_options(buffer, size);
+}
+#endif