google Snappy
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源地址
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <snappy.h>
#include <snappy-sinksource.h>
static const char* IN_NAME="./main.cc";
static const char* OUT_NAME="./main.cc.compress";
class FileSink:public snappy::Sink{
public:
FileSink(int fd):fd_(fd){
}
virtual ~FileSink(){}
virtual char* GetAppendBuffer(size_t length,char* scratch){
return scratch;
}
virtual void Append(const char* bytes,size_t n){
write(fd_,bytes,n);
}
private:
int fd_;
};
int main(){
struct stat stbuf;
stat(IN_NAME,&stbuf);
size_t in_fsize=stbuf.st_size;
size_t compress_fsize=0;
// do comress
char* in_buf=new char[in_fsize];
{
FILE* fin=fopen(IN_NAME,"rb");
fread(in_buf,1,in_fsize,fin);
fclose(fin);
snappy::ByteArraySource source(in_buf,in_fsize);
int fd=open(OUT_NAME,O_CREAT | O_WRONLY,0666);
FileSink sink(fd);
compress_fsize=snappy::Compress(&source,&sink);
close(fd);
}
// do decompress
stat(OUT_NAME,&stbuf);
size_t out_fsize=stbuf.st_size;
assert(out_fsize==compress_fsize);
char* out_buf=new char[out_fsize];
std::string out;
{
FILE* fin=fopen(OUT_NAME,"rb");
fread(out_buf,1,out_fsize,fin);
fclose(fin);
assert(snappy::Uncompress(out_buf,out_fsize,&out)==true);
}
// do validate
assert(out.size()==in_fsize);
assert(memcmp(out.data(),in_buf,in_fsize)==0);
delete [] in_buf;
delete [] out_buf;
return 0;
}
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <snappy.h>
#include <snappy-sinksource.h>
static const char* IN_NAME="./main.cc";
static const char* OUT_NAME="./main.cc.compress";
class FileSink:public snappy::Sink{
public:
FileSink(int fd):fd_(fd){
}
virtual ~FileSink(){}
virtual char* GetAppendBuffer(size_t length,char* scratch){
return scratch;
}
virtual void Append(const char* bytes,size_t n){
write(fd_,bytes,n);
}
private:
int fd_;
};
int main(){
struct stat stbuf;
stat(IN_NAME,&stbuf);
size_t in_fsize=stbuf.st_size;
size_t compress_fsize=0;
// do comress
char* in_buf=new char[in_fsize];
{
FILE* fin=fopen(IN_NAME,"rb");
fread(in_buf,1,in_fsize,fin);
fclose(fin);
snappy::ByteArraySource source(in_buf,in_fsize);
int fd=open(OUT_NAME,O_CREAT | O_WRONLY,0666);
FileSink sink(fd);
compress_fsize=snappy::Compress(&source,&sink);
close(fd);
}
// do decompress
stat(OUT_NAME,&stbuf);
size_t out_fsize=stbuf.st_size;
assert(out_fsize==compress_fsize);
char* out_buf=new char[out_fsize];
std::string out;
{
FILE* fin=fopen(OUT_NAME,"rb");
fread(out_buf,1,out_fsize,fin);
fclose(fin);
assert(snappy::Uncompress(out_buf,out_fsize,&out)==true);
}
// do validate
assert(out.size()==in_fsize);
assert(memcmp(out.data(),in_buf,in_fsize)==0);
delete [] in_buf;
delete [] out_buf;
return 0;
}
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