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#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<fcntl.h>
#include<libtar.h>
#include<bzlib.h>
#include<map>
#include"pack.h"
static int pack_copenfn(const char *pathname,int flags,...){
int fd;
pack_bzinfo *bzinfo;
if((fd = open(pathname,flags,0644)) == -1){
return -1;
}
bzinfo = new pack_bzinfo;
bzinfo->len = 0;
bzinfo->off = 0;
bzinfo->endflag = false;
bzinfo->bzs.bzalloc = NULL;
bzinfo->bzs.bzfree = NULL;
bzinfo->bzs.opaque = NULL;
BZ2_bzCompressInit(&bzinfo->bzs,9,0,0);
pack_fdmap.insert(std::pair<int,pack_bzinfo*>(fd,bzinfo));
return fd;
}
static int pack_cclosefn(long fd){
int ret;
pack_bzinfo *bzinfo;
bzinfo = pack_fdmap.find(fd)->second;
pack_fdmap.erase(fd);
bzinfo->bzs.next_in = NULL;
bzinfo->bzs.avail_in = 0;
while(true){
bzinfo->bzs.next_out = bzinfo->buf;
bzinfo->bzs.avail_out = PACK_BUFSIZE;
ret = BZ2_bzCompress(&bzinfo->bzs,BZ_FINISH);
if(bzinfo->bzs.avail_out != PACK_BUFSIZE){
write(fd,bzinfo->buf,PACK_BUFSIZE - bzinfo->bzs.avail_out);
}
if(ret == BZ_STREAM_END){
break;
}
}
BZ2_bzCompressEnd(&bzinfo->bzs);
delete bzinfo;
return close(fd);
}
static ssize_t pack_cwritefn(long fd,const void *buf,size_t count){
pack_bzinfo *bzinfo;
bzinfo = pack_fdmap.find(fd)->second;
bzinfo->bzs.next_in = (char*)buf;
bzinfo->bzs.avail_in = count;
while(bzinfo->bzs.avail_in > 0){
bzinfo->bzs.next_out = bzinfo->buf;
bzinfo->bzs.avail_out = PACK_BUFSIZE;
BZ2_bzCompress(&bzinfo->bzs,BZ_RUN);
if(bzinfo->bzs.avail_out != PACK_BUFSIZE){
write(fd,bzinfo->buf,PACK_BUFSIZE - bzinfo->bzs.avail_out);
}
}
return count;
}
static int pack_xopenfn(const char *pathname,int flags,...){
int fd;
pack_bzinfo *bzinfo;
if((fd = open(pathname,flags)) == -1){
return -1;
}
bzinfo = new pack_bzinfo;
bzinfo->len = 0;
bzinfo->off = 0;
bzinfo->endflag = false;
bzinfo->bzs.bzalloc = NULL;
bzinfo->bzs.bzfree = NULL;
bzinfo->bzs.opaque = NULL;
BZ2_bzDecompressInit(&bzinfo->bzs,0,0);
pack_fdmap.insert(std::pair<int,pack_bzinfo*>(fd,bzinfo));
return fd;
}
static int pack_xclosefn(long fd){
int ret;
pack_bzinfo *bzinfo;
bzinfo = pack_fdmap.find(fd)->second;
pack_fdmap.erase(fd);
BZ2_bzDecompressEnd(&bzinfo->bzs);
delete bzinfo;
return close(fd);
}
static ssize_t pack_xreadfn(long fd,void *buf,size_t count){
int ret;
pack_bzinfo *bzinfo;
bzinfo = pack_fdmap.find(fd)->second;
bzinfo->bzs.next_out = (char*)buf;
bzinfo->bzs.avail_out = count;
while(bzinfo->endflag == false){
if(bzinfo->len == 0){
ret = read(fd,bzinfo->buf,PACK_BUFSIZE);
bzinfo->len = ret;
bzinfo->off = 0;
}
if(bzinfo->len == 0){
break;
}
bzinfo->bzs.next_in = bzinfo->buf + bzinfo->off;
bzinfo->bzs.avail_in = bzinfo->len;
while(bzinfo->bzs.avail_in > 0 && bzinfo->bzs.avail_out > 0){
if(BZ2_bzDecompress(&bzinfo->bzs) != BZ_OK){
bzinfo->endflag = true;
break;
}
}
bzinfo->off += bzinfo->len - bzinfo->bzs.avail_in;
bzinfo->len = bzinfo->bzs.avail_in;
if(bzinfo->bzs.avail_out == 0){
break;
}
}
return count - bzinfo->bzs.avail_out;
}
int pack_pack(char *packpath,char *dirpath){
tartype_t tartype;
TAR *tarp;
tartype.openfunc = pack_copenfn;
tartype.closefunc = pack_cclosefn;
tartype.readfunc = (readfunc_t)read;
tartype.writefunc = pack_cwritefn;
tar_open(&tarp,packpath,&tartype,O_WRONLY | O_CREAT,0644,TAR_GNU);
tar_append_tree(tarp,dirpath,".");
tar_close(tarp);
return 0;
}
int pack_unpack(char *packpath,char *dirpath){
tartype_t tartype;
TAR *tarp;
tartype.openfunc = pack_xopenfn;
tartype.closefunc = pack_xclosefn;
tartype.readfunc = pack_xreadfn;
tartype.writefunc = (writefunc_t)write;
tar_open(&tarp,packpath,&tartype,O_RDONLY,0644,TAR_GNU);
tar_extract_all(tarp,dirpath);
tar_close(tarp);
return 0;
}
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