Gabriele Cosmo
49 lines
1.3 KiB
Plaintext
49 lines
1.3 KiB
Plaintext
// Copyright (C) 2010, Guy Barrand. All rights reserved.
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// See the file tools.license for terms.
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#ifndef tools_fileis
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#define tools_fileis
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#include <cstdio>
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#include <cstring>
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#include <string>
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namespace tools {
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namespace file {
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inline bool signature(const std::string& a_file,unsigned char a_head[],unsigned int& a_num){ //it is assumed a_head[] can contain a_num chars.
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FILE* file = ::fopen(a_file.c_str(),"rb");
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if(!file) {a_num=0;return false;}
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a_num = (unsigned int)::fread(a_head,1,a_num,file);
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::fclose(file);
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return true;
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}
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inline bool is_gzip(const std::string& a_file,bool& a_is){
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unsigned char head[4];
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{unsigned int num = 4;
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if(!signature(a_file,head,num)) {a_is = false;return false;}
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if(num!=4) {a_is = false;return true;}}
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if(head[0]!=31) {a_is = false;return true;}
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if(head[1]!=139) {a_is = false;return true;}
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a_is = true;
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return true;
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}
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inline bool is_root(const std::string& a_file,bool& a_is){
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unsigned char head[4];
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{unsigned int num = 4;
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if(!signature(a_file,head,num)) {a_is = false;return false;}
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if(num!=4) {a_is = false;return true;}}
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if(head[0]!='r') {a_is = false;return true;}
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if(head[1]!='o') {a_is = false;return true;}
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if(head[2]!='o') {a_is = false;return true;}
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if(head[3]!='t') {a_is = false;return true;}
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a_is = true;
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return true;
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}
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}}
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#endif
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