elinks/src/encoding/encoding.h

#ifndef EL__ENCODING_ENCODING_H
#define EL__ENCODING_ENCODING_H

#include "network/state.h"
#include "util/string.h"

enum stream_encoding {
	ENCODING_NONE = 0,
	ENCODING_GZIP,
	ENCODING_BZIP2,
	ENCODING_LZMA,

	/* Max. number of known encoding including ENCODING_NONE. */
	ENCODINGS_KNOWN,
};

struct stream_encoded {
	enum stream_encoding encoding;
	void *data;
};

struct decoding_backend {
	unsigned char *name;
	unsigned char **extensions;
	int (*open)(struct stream_encoded *stream, int fd);
	int (*read)(struct stream_encoded *stream, unsigned char *data, int len);
	unsigned char *(*decode)(struct stream_encoded *stream, unsigned char *data, int len, int *new_len);
	unsigned char *(*decode_buffer)(unsigned char *data, int len, int *new_len);
	void (*close)(struct stream_encoded *stream);
};

struct stream_encoded *open_encoded(int, enum stream_encoding);
int read_encoded(struct stream_encoded *, unsigned char *, int);
unsigned char *decode_encoded(struct stream_encoded *, unsigned char *, int, int *);
unsigned char *decode_encoded_buffer(enum stream_encoding encoding, unsigned char *data, int len, int *new_len);
void close_encoded(struct stream_encoded *);

unsigned char **listext_encoded(enum stream_encoding);
enum stream_encoding guess_encoding(unsigned char *filename);
unsigned char *get_encoding_name(enum stream_encoding encoding);

/* Read from open @stream into the @page string */
enum connection_state
read_file(struct stream_encoded *stream, int readsize, struct string *page);

/* Reads the file with the given @filename into the string @source. */
enum connection_state read_encoded_file(struct string *filename, struct string *source);

#endif