File Split 1.0

最新推荐文章于 2024-09-13 08:06:32 发布

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最新推荐文章于 2024-09-13 08:06:32 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/rms365/p/11003282.html

本文介绍了一个使用C++实现的文件分割工具，通过指定源文件、起始偏移量和结束偏移量，可以将文件分割成指定大小的片段。文章详细展示了如何读取文件、处理偏移量并创建目标文件。

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main.cpp

 1 #include <iostream>
 2 #include <fstream>
 3 #include <stdlib.h>
 4 #include <string>
 5 #include <windows.h>
 6 
 7 using namespace std;
 8 
 9 int main ( int argc, char* argv[] ) {
10     if ( argc != 4 && argc != 5 ) {
11         cout << "File Split 1.0" << endl;
12         cout << "    Usage: fs <source file> <off begin> <off end> [<destination file>]" << endl;
13         cout << "    e.g. fs app.exe 0 127 0_127.dat" << endl;
14         cout << "    e.g. fs app.exe 0 127" << endl;
15         return -1;
16     }
17     fstream src ( argv[1], ios::in | ios::binary | ios::ate );
18     if ( src.is_open() ) {
19         long long srcSize = static_cast<long long> ( src.tellg() );
20         cout << "<source file> size: " << srcSize << " bytes" << "." << endl;
21         long lgBegin = strtol ( argv[2], NULL, 10 );
22         long lgEnd = strtol ( argv[3], NULL, 10 );
23         std::ios_base::seekdir offBegin = static_cast<std::ios_base::seekdir> ( lgBegin );
24         std::ios_base::seekdir offEnd = static_cast<std::ios_base::seekdir> ( lgEnd );
25         if ( offBegin >= 0 && offEnd < srcSize && offBegin <= offEnd ) {
26             string dstPath = "";
27             if ( argc == 5 ) {
28                 dstPath += argv[4];
29             } else {
30                 char buf[32];
31                 dstPath += ltoa ( lgBegin, buf, 10 );
32                 dstPath += "_";
33                 dstPath += ltoa ( lgEnd, buf, 10 );
34                 dstPath += ".bin";
35             }
36             cout << "Offsets with " << offBegin << " ~ " << offEnd << "." << endl;
37             fstream dst ( dstPath.c_str(), ios::out | ios::binary | ios::trunc );
38             if ( dst.is_open() ) {
39                 src.seekg ( offBegin );
40                 for ( int i = offBegin; i <= offEnd; i++ ) {
41                     dst.put ( src.get() );
42                 }
43                 dst.flush();
44                 dst.close();
45                 src.close();
46                 cout << "<destination file> expected size: " << offEnd - offBegin + 1 << " bytes" << "." << endl;
47                 fstream chk ( dstPath.c_str(), ios::in | ios::binary | ios::ate );
48                 if ( chk.is_open() ) {
49                     long long chkSize = static_cast<long long> ( chk.tellg() );
50                     chk.close();
51                     cout << "<destination file> actual size: " << chkSize << " bytes" << "." << endl;
52                     cout << "<destination file> state " << ( chkSize != offEnd - offBegin + 1 ? "bad" : "good" ) << "." << endl;
53                 } else {
54                     cout << "Can not open <destination file> file." << endl;
55                     return -1;
56                 }
57                 cout << "File split completed." << endl;
58                 return 0;
59             } else {
60                 src.close();
61                 cout << "Can not create <destination file> file." << endl;
62                 return -1;
63             }
64         } else {
65             src.close();
66             cout << "Invalid offsets. The allowed offsets is 0 ~ " << srcSize - 1 << "." << endl;
67             return -1;
68         }
69     } else {
70         cout << "Can not open <source file> file." << endl;
71         return -1;
72     }
73 }