diff options
Diffstat (limited to 'app-arch/gzip/files/gzip-1.3.5-rsync.patch')
| -rw-r--r-- | app-arch/gzip/files/gzip-1.3.5-rsync.patch | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/app-arch/gzip/files/gzip-1.3.5-rsync.patch b/app-arch/gzip/files/gzip-1.3.5-rsync.patch new file mode 100644 index 000000000000..6f4d7f22fd8e --- /dev/null +++ b/app-arch/gzip/files/gzip-1.3.5-rsync.patch @@ -0,0 +1,279 @@ +Patch by Rusty Russell that adds --rsyncable option to gzip. + +Debian & Fedora use this, so let's join the party :p. + +--- gzip-1.3.2/deflate.c ++++ gzip-1.3.2/deflate.c +@@ -122,6 +122,14 @@ + #endif + /* Matches of length 3 are discarded if their distance exceeds TOO_FAR */ + ++#ifndef RSYNC_WIN ++# define RSYNC_WIN 4096 ++#endif ++/* Size of rsync window, must be < MAX_DIST */ ++ ++#define RSYNC_SUM_MATCH(sum) ((sum) % RSYNC_WIN == 0) ++/* Whether window sum matches magic value */ ++ + /* =========================================================================== + * Local data used by the "longest match" routines. + */ +@@ -203,6 +211,8 @@ + unsigned near good_match; + /* Use a faster search when the previous match is longer than this */ + ++local ulg rsync_sum; /* rolling sum of rsync window */ ++local ulg rsync_chunk_end; /* next rsync sequence point */ + + /* Values for max_lazy_match, good_match and max_chain_length, depending on + * the desired pack level (0..9). The values given below have been tuned to +@@ -301,6 +311,10 @@ + #endif + /* prev will be initialized on the fly */ + ++ /* rsync params */ ++ rsync_chunk_end = 0xFFFFFFFFUL; ++ rsync_sum = 0; ++ + /* Set the default configuration parameters: + */ + max_lazy_match = configuration_table[pack_level].max_lazy; +@@ -537,6 +551,8 @@ + memcpy((char*)window, (char*)window+WSIZE, (unsigned)WSIZE); + match_start -= WSIZE; + strstart -= WSIZE; /* we now have strstart >= MAX_DIST: */ ++ if (rsync_chunk_end != 0xFFFFFFFFUL) ++ rsync_chunk_end -= WSIZE; + + block_start -= (long) WSIZE; + +@@ -564,13 +580,46 @@ + } + } + ++local void rsync_roll(start, num) ++ unsigned start; ++ unsigned num; ++{ ++ unsigned i; ++ ++ if (start < RSYNC_WIN) { ++ /* before window fills. */ ++ for (i = start; i < RSYNC_WIN; i++) { ++ if (i == start + num) return; ++ rsync_sum += (ulg)window[i]; ++ } ++ num -= (RSYNC_WIN - start); ++ start = RSYNC_WIN; ++ } ++ ++ /* buffer after window full */ ++ for (i = start; i < start+num; i++) { ++ /* New character in */ ++ rsync_sum += (ulg)window[i]; ++ /* Old character out */ ++ rsync_sum -= (ulg)window[i - RSYNC_WIN]; ++ if (rsync_chunk_end == 0xFFFFFFFFUL && RSYNC_SUM_MATCH(rsync_sum)) ++ rsync_chunk_end = i; ++ } ++} ++ ++/* =========================================================================== ++ * Set rsync_chunk_end if window sum matches magic value. ++ */ ++#define RSYNC_ROLL(s, n) \ ++ do { if (rsync) rsync_roll((s), (n)); } while(0) ++ + /* =========================================================================== + * Flush the current block, with given end-of-file flag. + * IN assertion: strstart is set to the end of the current match. + */ + #define FLUSH_BLOCK(eof) \ + flush_block(block_start >= 0L ? (char*)&window[(unsigned)block_start] : \ +- (char*)NULL, (long)strstart - block_start, (eof)) ++ (char*)NULL, (long)strstart - block_start, flush-1, (eof)) + + /* =========================================================================== + * Processes a new input file and return its compressed length. This +@@ -581,7 +630,7 @@ + local off_t deflate_fast() + { + IPos hash_head; /* head of the hash chain */ +- int flush; /* set if current block must be flushed */ ++ int flush; /* set if current block must be flushed, 2=>and padded */ + unsigned match_length = 0; /* length of best match */ + + prev_length = MIN_MATCH-1; +@@ -610,6 +659,7 @@ + + lookahead -= match_length; + ++ RSYNC_ROLL(strstart, match_length); + /* Insert new strings in the hash table only if the match length + * is not too large. This saves time but degrades compression. + */ +@@ -638,9 +688,14 @@ + /* No match, output a literal byte */ + Tracevv((stderr,"%c",window[strstart])); + flush = ct_tally (0, window[strstart]); ++ RSYNC_ROLL(strstart, 1); + lookahead--; + strstart++; + } ++ if (rsync && strstart > rsync_chunk_end) { ++ rsync_chunk_end = 0xFFFFFFFFUL; ++ flush = 2; ++ } + if (flush) FLUSH_BLOCK(0), block_start = strstart; + + /* Make sure that we always have enough lookahead, except +@@ -713,6 +768,7 @@ + */ + lookahead -= prev_length-1; + prev_length -= 2; ++ RSYNC_ROLL(strstart, prev_length+1); + do { + strstart++; + INSERT_STRING(strstart, hash_head); +@@ -725,24 +781,39 @@ + match_available = 0; + match_length = MIN_MATCH-1; + strstart++; +- if (flush) FLUSH_BLOCK(0), block_start = strstart; + ++ if (rsync && strstart > rsync_chunk_end) { ++ rsync_chunk_end = 0xFFFFFFFFUL; ++ flush = 2; ++ } ++ if (flush) FLUSH_BLOCK(0), block_start = strstart; + } else if (match_available) { + /* If there was no match at the previous position, output a + * single literal. If there was a match but the current match + * is longer, truncate the previous match to a single literal. + */ + Tracevv((stderr,"%c",window[strstart-1])); +- if (ct_tally (0, window[strstart-1])) { +- FLUSH_BLOCK(0), block_start = strstart; +- } ++ flush = ct_tally (0, window[strstart-1]); ++ if (rsync && strstart > rsync_chunk_end) { ++ rsync_chunk_end = 0xFFFFFFFFUL; ++ flush = 2; ++ } ++ if (flush) FLUSH_BLOCK(0), block_start = strstart; ++ RSYNC_ROLL(strstart, 1); + strstart++; + lookahead--; + } else { + /* There is no previous match to compare with, wait for + * the next step to decide. + */ ++ if (rsync && strstart > rsync_chunk_end) { ++ /* Reset huffman tree */ ++ rsync_chunk_end = 0xFFFFFFFFUL; ++ flush = 2; ++ FLUSH_BLOCK(0), block_start = strstart; ++ } + match_available = 1; ++ RSYNC_ROLL(strstart, 1); + strstart++; + lookahead--; + } +--- gzip-1.3.2/gzip.c ++++ gzip-1.3.2/gzip.c +@@ -249,6 +249,7 @@ + unsigned insize; /* valid bytes in inbuf */ + unsigned inptr; /* index of next byte to be processed in inbuf */ + unsigned outcnt; /* bytes in output buffer */ ++int rsync = 0; /* make ryncable chunks */ + + struct option longopts[] = + { +@@ -278,6 +279,7 @@ + {"best", 0, 0, '9'}, /* compress better */ + {"lzw", 0, 0, 'Z'}, /* make output compatible with old compress */ + {"bits", 1, 0, 'b'}, /* max number of bits per code (implies -Z) */ ++ {"rsyncable", 0, 0, 'R'}, /* make rsync-friendly archive */ + { 0, 0, 0, 0 } + }; + +@@ -368,6 +370,7 @@ + " -Z --lzw produce output compatible with old compress", + " -b --bits maxbits max number of bits per code (implies -Z)", + #endif ++ " --rsyncable Make rsync-friendly archive", + " file... files to (de)compress. If none given, use standard input.", + "Report bugs to <bug-gzip@gnu.org>.", + 0}; +@@ -546,6 +549,9 @@ + #else + recursive = 1; break; + #endif ++ case 'R': ++ rsync = 1; break; ++ + case 'S': + #ifdef NO_MULTIPLE_DOTS + if (*optarg == '.') optarg++; +--- gzip-1.3.2/gzip.h ++++ gzip-1.3.2/gzip.h +@@ -133,6 +133,7 @@ + extern unsigned insize; /* valid bytes in inbuf */ + extern unsigned inptr; /* index of next byte to be processed in inbuf */ + extern unsigned outcnt; /* bytes in output buffer */ ++extern int rsync; /* deflate into rsyncable chunks */ + + extern off_t bytes_in; /* number of input bytes */ + extern off_t bytes_out; /* number of output bytes */ +@@ -281,7 +282,7 @@ + /* in trees.c */ + void ct_init OF((ush *attr, int *method)); + int ct_tally OF((int dist, int lc)); +-off_t flush_block OF((char *buf, ulg stored_len, int eof)); ++off_t flush_block OF((char *buf, ulg stored_len, int pad, int eof)); + + /* in bits.c */ + void bi_init OF((file_t zipfile)); +--- gzip-1.3.2/gzip.texi ++++ gzip-1.3.2/gzip.texi +@@ -340,6 +340,14 @@ + into the directory and compress all the files it finds there (or + decompress them in the case of @code{gunzip}). + ++@item --rsyncable ++While compressing, synchronize the output occasionally based on the ++input. This reduces compression by about 1 percent most cases, but ++means that the @code{rsync} program can take advantage of similarities ++in the uncompressed input when syncronizing two files compressed with ++this flag. @code{gunzip} cannot tell the difference between a ++compressed file created with this option, and one created without it. ++ + @item --suffix @var{suf} + @itemx -S @var{suf} + Use suffix @samp{@var{suf}} instead of @samp{.gz}. Any suffix can be +--- gzip-1.3.2/trees.c ++++ gzip-1.3.2/trees.c +@@ -847,9 +847,10 @@ + * trees or store, and output the encoded block to the zip file. This function + * returns the total compressed length for the file so far. + */ +-off_t flush_block(buf, stored_len, eof) ++off_t flush_block(buf, stored_len, pad, eof) + char *buf; /* input block, or NULL if too old */ + ulg stored_len; /* length of input block */ ++ int pad; /* pad output to byte boundary */ + int eof; /* true if this is the last block for a file */ + { + ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */ +@@ -941,6 +942,10 @@ + Assert (input_len == bytes_in, "bad input size"); + bi_windup(); + compressed_len += 7; /* align on byte boundary */ ++ } else if (pad && (compressed_len % 8) != 0) { ++ send_bits((STORED_BLOCK<<1)+eof, 3); /* send block type */ ++ compressed_len = (compressed_len + 3 + 7) & ~7L; ++ copy_block(buf, 0, 1); /* with header */ + } + + return compressed_len >> 3; |