| Geant4 Cross Reference |
1 // Copyright (C) 2010, Guy Barrand. All rights
2 // See the file tools.license for terms.
3
4 #ifndef tools_gzip
5 #define tools_gzip
6
7 #include "signature"
8
9 namespace tools {
10 namespace file {
11
12 inline bool is_gzip(const std::string& a_file,
13 unsigned char head[4];
14 {unsigned int num = 4;
15 if(!signature(a_file,head,num)) {a_is = fals
16 if(num!=4) {a_is = false;return true;}}
17 if(head[0]!=31) {a_is = false;return true;}
18 if(head[1]!=139) {a_is = false;return true;}
19 //if(head[2]!=8) {a_is = false;return true;}
20 //if(head[3]!=8) {a_is = false;return true;}
21 a_is = true;
22 return true;
23 }
24
25 inline bool gzip_usize(const std::string& a_fi
26 bool is;
27 if(!is_gzip(a_file,is)) {a_usz=0;return fals
28 if(!is) {a_usz=0;return false;}
29 FILE* file = ::fopen(a_file.c_str(),"rb");
30 if(!file) {a_usz=0;return false;}
31 ::fseek(file,-4,SEEK_END);
32 unsigned char buf[4];
33 size_t n = ::fread(buf,1,4,file);
34 ::fclose(file);
35 if(n!=4) {a_usz=0;return false;}
36 unsigned int b4 = buf[0];
37 unsigned int b3 = buf[1];
38 unsigned int b2 = buf[2];
39 unsigned int b1 = buf[3];
40 a_usz = (b1 << 24) | ((b2 << 16) + (b3 << 8)
41 return true;
42 }
43
44 }}
45
46 #endif