123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778 |
- /* Copyright (c) 2003, Roger Dingledine
- * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
- * Copyright (c) 2007-2017, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- /**
- * \file compress.h
- * \brief Headers for compress.c
- **/
- #ifndef TOR_COMPRESS_H
- #define TOR_COMPRESS_H
- /** Enumeration of what kind of compression to use. Only ZLIB_METHOD and
- * GZIP_METHOD is guaranteed to be supported by the compress/uncompress
- * functions here. */
- typedef enum {
- NO_METHOD=0,
- GZIP_METHOD=1,
- ZLIB_METHOD=2,
- LZMA_METHOD=3,
- UNKNOWN_METHOD=4
- } compress_method_t;
- /**
- * Enumeration to define tradeoffs between memory usage and compression level.
- * HIGH_COMPRESSION saves the most bandwidth; LOW_COMPRESSION saves the most
- * memory.
- **/
- typedef enum {
- HIGH_COMPRESSION, MEDIUM_COMPRESSION, LOW_COMPRESSION
- } compression_level_t;
- int
- tor_compress(char **out, size_t *out_len,
- const char *in, size_t in_len,
- compress_method_t method);
- int
- tor_uncompress(char **out, size_t *out_len,
- const char *in, size_t in_len,
- compress_method_t method,
- int complete_only,
- int protocol_warn_level);
- compress_method_t detect_compression_method(const char *in, size_t in_len);
- int
- tor_compress_memory_level(compression_level_t level);
- int
- tor_compress_is_compression_bomb(size_t size_in, size_t size_out);
- /** Return values from tor_compress_process; see that function's documentation
- * for details. */
- typedef enum {
- TOR_COMPRESS_OK,
- TOR_COMPRESS_DONE,
- TOR_COMPRESS_BUFFER_FULL,
- TOR_COMPRESS_ERROR
- } tor_compress_output_t;
- /** Internal state for an incremental compression/decompression. */
- typedef struct tor_compress_state_t tor_compress_state_t;
- tor_compress_state_t *tor_compress_new(int compress,
- compress_method_t method,
- compression_level_t level);
- tor_compress_output_t tor_compress_process(tor_compress_state_t *state,
- char **out, size_t *out_len,
- const char **in, size_t *in_len,
- int finish);
- void tor_compress_free(tor_compress_state_t *state);
- size_t tor_compress_state_size(const tor_compress_state_t *state);
- #endif // TOR_COMPRESS_H.
|