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