54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* Copyright (c) 2004, 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_none.c
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* \brief Compression backend for identity compression.
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*
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* We actually define this backend so that we can treat the identity transform
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* as another case of compression.
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*
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* This module should never be invoked directly. Use the compress module
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* instead.
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**/
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#include "orconfig.h"
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#include "util.h"
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#include "torlog.h"
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#include "compress.h"
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#include "compress_none.h"
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/** Transfer some bytes using the identity transformation. Read up to
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* *<b>in_len</b> bytes from *<b>in</b>, and write up to *<b>out_len</b> bytes
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* to *<b>out</b>, adjusting the values as we go. If <b>finish</b> is true,
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* we've reached the end of the input.
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*
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* Return TOR_COMPRESS_DONE if we've finished the entire
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* compression/decompression.
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* Return TOR_COMPRESS_OK if we're processed everything from the input.
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* Return TOR_COMPRESS_BUFFER_FULL if we're out of space on <b>out</b>.
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* Return TOR_COMPRESS_ERROR if the stream is corrupt.
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*/
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tor_compress_output_t
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tor_cnone_compress_process(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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{
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size_t n_to_copy = MIN(*in_len, *out_len);
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memcpy(*out, *in, n_to_copy);
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*out += n_to_copy;
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*in += n_to_copy;
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*out_len -= n_to_copy;
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*in_len -= n_to_copy;
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if (*in_len == 0) {
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return finish ? TOR_COMPRESS_DONE : TOR_COMPRESS_OK;
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} else {
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return TOR_COMPRESS_BUFFER_FULL;
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}
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}
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