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zlib: clean up some dead code
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Cleanup unused `if 0'-ed functions, which have been dead since 2006
(commits 87c2ce3 ("lib/zlib*: cleanups") by Adrian Bunk and
4f3865f ("zlib_inflate: Upgrade library code to a recent version")
by Richard Purdie):

 - zlib_deflateSetDictionary
 - zlib_deflateParams
 - zlib_deflateCopy
 - zlib_inflateSync
 - zlib_syncsearch
 - zlib_inflateSetDictionary
 - zlib_inflatePrime

Signed-off-by: Sergey Senozhatsky <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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sergey-senozhatsky authored and torvalds committed Aug 7, 2014
1 parent 0f9859c commit 62e7ca5
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118 changes: 0 additions & 118 deletions include/linux/zlib.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -493,64 +493,6 @@ extern int deflateInit2 (z_streamp strm,
method). msg is set to null if there is no error message. deflateInit2 does
not perform any compression: this will be done by deflate().
*/

#if 0
extern int zlib_deflateSetDictionary (z_streamp strm,
const Byte *dictionary,
uInt dictLength);
#endif
/*
Initializes the compression dictionary from the given byte sequence
without producing any compressed output. This function must be called
immediately after deflateInit, deflateInit2 or deflateReset, before any
call of deflate. The compressor and decompressor must use exactly the same
dictionary (see inflateSetDictionary).
The dictionary should consist of strings (byte sequences) that are likely
to be encountered later in the data to be compressed, with the most commonly
used strings preferably put towards the end of the dictionary. Using a
dictionary is most useful when the data to be compressed is short and can be
predicted with good accuracy; the data can then be compressed better than
with the default empty dictionary.
Depending on the size of the compression data structures selected by
deflateInit or deflateInit2, a part of the dictionary may in effect be
discarded, for example if the dictionary is larger than the window size in
deflate or deflate2. Thus the strings most likely to be useful should be
put at the end of the dictionary, not at the front.
Upon return of this function, strm->adler is set to the Adler32 value
of the dictionary; the decompressor may later use this value to determine
which dictionary has been used by the compressor. (The Adler32 value
applies to the whole dictionary even if only a subset of the dictionary is
actually used by the compressor.)
deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
parameter is invalid (such as NULL dictionary) or the stream state is
inconsistent (for example if deflate has already been called for this stream
or if the compression method is bsort). deflateSetDictionary does not
perform any compression: this will be done by deflate().
*/

#if 0
extern int zlib_deflateCopy (z_streamp dest, z_streamp source);
#endif

/*
Sets the destination stream as a complete copy of the source stream.
This function can be useful when several compression strategies will be
tried, for example when there are several ways of pre-processing the input
data with a filter. The streams that will be discarded should then be freed
by calling deflateEnd. Note that deflateCopy duplicates the internal
compression state which can be quite large, so this strategy is slow and
can consume lots of memory.
deflateCopy returns Z_OK if success, Z_MEM_ERROR if there was not
enough memory, Z_STREAM_ERROR if the source stream state was inconsistent
(such as zalloc being NULL). msg is left unchanged in both source and
destination.
*/

extern int zlib_deflateReset (z_streamp strm);
/*
Expand All @@ -568,27 +510,6 @@ static inline unsigned long deflateBound(unsigned long s)
return s + ((s + 7) >> 3) + ((s + 63) >> 6) + 11;
}

#if 0
extern int zlib_deflateParams (z_streamp strm, int level, int strategy);
#endif
/*
Dynamically update the compression level and compression strategy. The
interpretation of level and strategy is as in deflateInit2. This can be
used to switch between compression and straight copy of the input data, or
to switch to a different kind of input data requiring a different
strategy. If the compression level is changed, the input available so far
is compressed with the old level (and may be flushed); the new level will
take effect only at the next call of deflate().
Before the call of deflateParams, the stream state must be set as for
a call of deflate(), since the currently available input may have to
be compressed and flushed. In particular, strm->avail_out must be non-zero.
deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source
stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR
if strm->avail_out was zero.
*/

/*
extern int inflateInit2 (z_streamp strm, int windowBits);
Expand Down Expand Up @@ -631,45 +552,6 @@ extern int inflateInit2 (z_streamp strm, int windowBits);
and avail_out are unchanged.)
*/

extern int zlib_inflateSetDictionary (z_streamp strm,
const Byte *dictionary,
uInt dictLength);
/*
Initializes the decompression dictionary from the given uncompressed byte
sequence. This function must be called immediately after a call of inflate,
if that call returned Z_NEED_DICT. The dictionary chosen by the compressor
can be determined from the adler32 value returned by that call of inflate.
The compressor and decompressor must use exactly the same dictionary (see
deflateSetDictionary). For raw inflate, this function can be called
immediately after inflateInit2() or inflateReset() and before any call of
inflate() to set the dictionary. The application must insure that the
dictionary that was used for compression is provided.
inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
parameter is invalid (such as NULL dictionary) or the stream state is
inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
expected one (incorrect adler32 value). inflateSetDictionary does not
perform any decompression: this will be done by subsequent calls of
inflate().
*/

#if 0
extern int zlib_inflateSync (z_streamp strm);
#endif
/*
Skips invalid compressed data until a full flush point (see above the
description of deflate with Z_FULL_FLUSH) can be found, or until all
available input is skipped. No output is provided.
inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR
if no more input was provided, Z_DATA_ERROR if no flush point has been found,
or Z_STREAM_ERROR if the stream structure was inconsistent. In the success
case, the application may save the current current value of total_in which
indicates where valid compressed data was found. In the error case, the
application may repeatedly call inflateSync, providing more input each time,
until success or end of the input data.
*/

extern int zlib_inflateReset (z_streamp strm);
/*
This function is equivalent to inflateEnd followed by inflateInit,
Expand Down
143 changes: 0 additions & 143 deletions lib/zlib_deflate/deflate.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -249,52 +249,6 @@ int zlib_deflateInit2(
return zlib_deflateReset(strm);
}

/* ========================================================================= */
#if 0
int zlib_deflateSetDictionary(
z_streamp strm,
const Byte *dictionary,
uInt dictLength
)
{
deflate_state *s;
uInt length = dictLength;
uInt n;
IPos hash_head = 0;

if (strm == NULL || strm->state == NULL || dictionary == NULL)
return Z_STREAM_ERROR;

s = (deflate_state *) strm->state;
if (s->status != INIT_STATE) return Z_STREAM_ERROR;

strm->adler = zlib_adler32(strm->adler, dictionary, dictLength);

if (length < MIN_MATCH) return Z_OK;
if (length > MAX_DIST(s)) {
length = MAX_DIST(s);
#ifndef USE_DICT_HEAD
dictionary += dictLength - length; /* use the tail of the dictionary */
#endif
}
memcpy((char *)s->window, dictionary, length);
s->strstart = length;
s->block_start = (long)length;

/* Insert all strings in the hash table (except for the last two bytes).
* s->lookahead stays null, so s->ins_h will be recomputed at the next
* call of fill_window.
*/
s->ins_h = s->window[0];
UPDATE_HASH(s, s->ins_h, s->window[1]);
for (n = 0; n <= length - MIN_MATCH; n++) {
INSERT_STRING(s, n, hash_head);
}
if (hash_head) hash_head = 0; /* to make compiler happy */
return Z_OK;
}
#endif /* 0 */

/* ========================================================================= */
int zlib_deflateReset(
z_streamp strm
Expand Down Expand Up @@ -326,45 +280,6 @@ int zlib_deflateReset(
return Z_OK;
}

/* ========================================================================= */
#if 0
int zlib_deflateParams(
z_streamp strm,
int level,
int strategy
)
{
deflate_state *s;
compress_func func;
int err = Z_OK;

if (strm == NULL || strm->state == NULL) return Z_STREAM_ERROR;
s = (deflate_state *) strm->state;

if (level == Z_DEFAULT_COMPRESSION) {
level = 6;
}
if (level < 0 || level > 9 || strategy < 0 || strategy > Z_HUFFMAN_ONLY) {
return Z_STREAM_ERROR;
}
func = configuration_table[s->level].func;

if (func != configuration_table[level].func && strm->total_in != 0) {
/* Flush the last buffer: */
err = zlib_deflate(strm, Z_PARTIAL_FLUSH);
}
if (s->level != level) {
s->level = level;
s->max_lazy_match = configuration_table[level].max_lazy;
s->good_match = configuration_table[level].good_length;
s->nice_match = configuration_table[level].nice_length;
s->max_chain_length = configuration_table[level].max_chain;
}
s->strategy = strategy;
return err;
}
#endif /* 0 */

/* =========================================================================
* Put a short in the pending buffer. The 16-bit value is put in MSB order.
* IN assertion: the stream state is correct and there is enough room in
Expand Down Expand Up @@ -568,64 +483,6 @@ int zlib_deflateEnd(
return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK;
}

/* =========================================================================
* Copy the source state to the destination state.
*/
#if 0
int zlib_deflateCopy (
z_streamp dest,
z_streamp source
)
{
#ifdef MAXSEG_64K
return Z_STREAM_ERROR;
#else
deflate_state *ds;
deflate_state *ss;
ush *overlay;
deflate_workspace *mem;


if (source == NULL || dest == NULL || source->state == NULL) {
return Z_STREAM_ERROR;
}

ss = (deflate_state *) source->state;

*dest = *source;

mem = (deflate_workspace *) dest->workspace;

ds = &(mem->deflate_memory);

dest->state = (struct internal_state *) ds;
*ds = *ss;
ds->strm = dest;

ds->window = (Byte *) mem->window_memory;
ds->prev = (Pos *) mem->prev_memory;
ds->head = (Pos *) mem->head_memory;
overlay = (ush *) mem->overlay_memory;
ds->pending_buf = (uch *) overlay;

memcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte));
memcpy(ds->prev, ss->prev, ds->w_size * sizeof(Pos));
memcpy(ds->head, ss->head, ds->hash_size * sizeof(Pos));
memcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size);

ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf);
ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush);
ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize;

ds->l_desc.dyn_tree = ds->dyn_ltree;
ds->d_desc.dyn_tree = ds->dyn_dtree;
ds->bl_desc.dyn_tree = ds->bl_tree;

return Z_OK;
#endif
}
#endif /* 0 */

/* ===========================================================================
* Read a new buffer from the current input stream, update the adler32
* and total number of bytes read. All deflate() input goes through
Expand Down
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