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Do not enable checksums for zlib compression.

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Summary:
Leveldb code already calculates checksums for each block. There
is no need to generate checksums inside zlib. This patch switches-off checksum generation/checking in zlib library.

(The Inno support for zlib uses windowsBits=14 as well.)

pfabricator marks this file as binary. But here is the diff

diff --git a/port/port_posix.h b/port/port_posix.h
index 86a0927..db4e0b8 100644
--- a/port/port_posix.h
+++ b/port/port_posix.h
@@ -163,7 +163,7 @@ inline bool Snappy_Uncompress(const char* input, size_t length,
 }

 inline bool Zlib_Compress(const char* input, size_t length,
-    ::std::string* output, int windowBits = 15, int level = -1,
+    ::std::string* output, int windowBits = -14, int level = -1,
      int strategy = 0) {
 #ifdef ZLIB
   // The memLevel parameter specifies how much memory should be allocated for
@@ -223,7 +223,7 @@ inline bool Zlib_Compress(const char* input, size_t length,
 }

 inline char* Zlib_Uncompress(const char* input_data, size_t input_length,
-    int* decompress_size, int windowBits = 15) {
+    int* decompress_size, int windowBits = -14) {
 #ifdef ZLIB
   z_stream _stream;
   memset(&_stream, 0, sizeof(z_stream));

Test Plan: run db_bench with zlib compression.

Reviewers: heyongqiang, MarkCallaghan

Reviewed By: heyongqiang

Differential Revision: https://reviews.facebook.net/D6105
This commit is contained in:
Dhruba Borthakur
2012-10-19 14:43:18 -07:00
parent cf5adc8016
commit 507f5aac73
1 changed files with 2 additions and 2 deletions
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4
port/port_posix.h
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@@ -163,7 +163,7 @@ inline bool Snappy_Uncompress(const char* input, size_t length,
}
inline bool Zlib_Compress(const char* input, size_t length,
::std::string* output, int windowBits = 15, int level = -1,
::std::string* output, int windowBits = -14, int level = -1,
int strategy = 0) {
#ifdef ZLIB
// The memLevel parameter specifies how much memory should be allocated for
@@ -223,7 +223,7 @@ inline bool Zlib_Compress(const char* input, size_t length,
}
inline char* Zlib_Uncompress(const char* input_data, size_t input_length,
int* decompress_size, int windowBits = 15) {
int* decompress_size, int windowBits = -14) {
#ifdef ZLIB
z_stream _stream;
memset(&_stream, 0, sizeof(z_stream));