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Author SHA1 Message Date
Victor Costan c98344f626 Fix Clang/GCC compilation warnings. 
This makes it easier to adopt snappy in other projects.

PiperOrigin-RevId: 309958249
 2020-05-05 16:15:02 +00:00
Victor Costan 5417da69b7 Switch from C headers to C++ headers. 
This CL makes the following substitutions.

* assert.h -> cassert
* math.h -> cmath
* stdarg.h -> cstdarg
* stdio.h -> cstdio
* stdlib.h -> cstdlib
* string.h -> cstring

stddef.h and stdint.h are not migrated to C++ headers.

PiperOrigin-RevId: 309074805
 2020-04-29 19:38:03 +00:00
Victor Costan 14bef66290 Modernize memcpy() and memmove() usage. 
This CL replaces memcpy() with std::memcpy()
and memmove() with std::memmove(), and #includes
<cstring> in files that use either function.

PiperOrigin-RevId: 306067788
 2020-04-12 00:06:15 +00:00
Steinar H. Gunderson b2312c4c25 Add support for Uncompress(source, sink). Various changes to allow 
Uncompress(source, sink) to get the same performance as the different
variants of Uncompress to Cord/DataBuffer/String/FlatBuffer.

Changes to efficiently support Uncompress(source, sink)
--------

a) For strings - we add support to StringByteSink to do GetAppendBuffer so we
   can write to it without copying.
b) For flat array buffers, we do GetAppendBuffer and see if we can get a full buffer.

With the above changes we get performance with ByteSource/ByteSink
that is	very close to directly using flat arrays and strings.

We add various benchmark cases to demonstrate that.

Orthogonal change
------------------

Add support for TryFastAppend() for SnappyScatteredWriter.

Benchmark results are below

CPU: Intel Core2 dL1:32KB dL2:4096KB
Benchmark              Time(ns)    CPU(ns) Iterations
-----------------------------------------------------
BM_UFlat/0               109065     108996       6410 896.0MB/s  html
BM_UFlat/1              1012175    1012343        691 661.4MB/s  urls
BM_UFlat/2                26775      26771      26149 4.4GB/s  jpg
BM_UFlat/3                48947      48940      14363 1.8GB/s  pdf
BM_UFlat/4               441029     440835       1589 886.1MB/s  html4
BM_UFlat/5                39861      39880      17823 588.3MB/s  cp
BM_UFlat/6                18315      18300      38126 581.1MB/s  c
BM_UFlat/7                 5254       5254     100000 675.4MB/s  lsp
BM_UFlat/8              1568060    1567376        447 626.6MB/s  xls
BM_UFlat/9               337512     337734       2073 429.5MB/s  txt1
BM_UFlat/10              287269     287054       2434 415.9MB/s  txt2
BM_UFlat/11              890098     890219        787 457.2MB/s  txt3
BM_UFlat/12             1186593    1186863        590 387.2MB/s  txt4
BM_UFlat/13              573927     573318       1000 853.7MB/s  bin
BM_UFlat/14               64250      64294      10000 567.2MB/s  sum
BM_UFlat/15                7301       7300      96153 552.2MB/s  man
BM_UFlat/16              109617     109636       6375 1031.5MB/s  pb
BM_UFlat/17              364438     364497       1921 482.3MB/s  gaviota
BM_UFlatSink/0           108518     108465       6450 900.4MB/s  html
BM_UFlatSink/1           991952     991997        705 675.0MB/s  urls
BM_UFlatSink/2            26815      26798      26065 4.4GB/s  jpg
BM_UFlatSink/3            49127      49122      14255 1.8GB/s  pdf
BM_UFlatSink/4           436674     436731       1604 894.4MB/s  html4
BM_UFlatSink/5            39738      39733      17345 590.5MB/s  cp
BM_UFlatSink/6            18413      18416      37962 577.4MB/s  c
BM_UFlatSink/7             5677       5676     100000 625.2MB/s  lsp
BM_UFlatSink/8          1552175    1551026        451 633.2MB/s  xls
BM_UFlatSink/9           338526     338489       2065 428.5MB/s  txt1
BM_UFlatSink/10          289387     289307       2420 412.6MB/s  txt2
BM_UFlatSink/11          893803     893706        783 455.4MB/s  txt3
BM_UFlatSink/12         1195919    1195459        586 384.4MB/s  txt4
BM_UFlatSink/13          559637     559779       1000 874.3MB/s  bin
BM_UFlatSink/14           65073      65094      10000 560.2MB/s  sum
BM_UFlatSink/15            7618       7614      92823 529.5MB/s  man
BM_UFlatSink/16          110085     110121       6352 1027.0MB/s  pb
BM_UFlatSink/17          369196     368915       1896 476.5MB/s  gaviota
BM_UValidate/0            46954      46957      14899 2.0GB/s  html
BM_UValidate/1           500621     500868       1000 1.3GB/s  urls
BM_UValidate/2              283        283    2481447 417.2GB/s  jpg
BM_UValidate/3            16230      16228      43137 5.4GB/s  pdf
BM_UValidate/4           189129     189193       3701 2.0GB/s  html4

A=uday
R=sanjay
 2015-07-06 14:21:00 +02:00
snappy.mirrorbot@gmail.com e750dc0f05 Minor refactoring to accomodate changes in Google's internal code tree. 
git-svn-id: https://snappy.googlecode.com/svn/trunk@57 03e5f5b5-db94-4691-08a0-1a8bf15f6143
 2012-01-08 17:55:48 +00:00
snappy.mirrorbot@gmail.com 7e8ca8f831 Change on 2011-03-25 19:18:00-07:00 by sesse 
Replace the Apache 2.0 license header by the BSD-type license header;
	somehow a lot of the files were missed in the last round.

	R=dannyb,csilvers
	DELTA=147  (74 added, 2 deleted, 71 changed)

Change on 2011-03-25 19:25:07-07:00 by sesse

	Unbreak the build; the relicensing removed a bit too much (only comments
	were intended, but I also accidentially removed some of the top lines of
	the actual source).



Revision created by MOE tool push_codebase.
MOE_MIGRATION=1072


git-svn-id: https://snappy.googlecode.com/svn/trunk@21 03e5f5b5-db94-4691-08a0-1a8bf15f6143
 2011-03-26 02:34:34 +00:00
snappy.mirrorbot@gmail.com 3e764216fc Add mising licensing headers to a few files. (Part 1/2.) 
R=csilvers
DELTA=24  (24 added, 0 deleted, 0 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=986


git-svn-id: https://snappy.googlecode.com/svn/trunk@4 03e5f5b5-db94-4691-08a0-1a8bf15f6143
 2011-03-23 11:10:39 +00:00
snappy.mirrorbot@gmail.com 28a6440239 Revision created by MOE tool push_codebase. 
MOE_MIGRATION=


git-svn-id: https://snappy.googlecode.com/svn/trunk@2 03e5f5b5-db94-4691-08a0-1a8bf15f6143
 2011-03-18 17:14:15 +00:00