使用zlib解压缩.zip文件的简单方法
有一个简单的例子,如何解压缩.zip文件并将文件解压缩到目录? 我目前使用zlib,虽然我知道zlib不直接处理zip文件,似乎在zlibs的“contrib”库中有几个额外的东西。 我注意到并阅读了“minizip”,在阅读了一些文档并查看了一些代码之后,我没有看到一个简单的例子,就是如何解压.zip文件并将这些文件解压到一个目录中。
我想find一个独立于平台的方式,但如果这是不可能的,那么我需要find一个Windows和Mac的方式。
zlib
处理deflate压缩/解压缩algorithm,但在ZIP文件中不止这些。
你可以试试libzip 。 它是免费的,便携式和易于使用。
更新:在这里,我附上libzip quick'n'dirty示例,所有的错误控制ommited:
#include <zip.h> int main() { //Open the ZIP archive int err = 0; zip *z = zip_open("foo.zip", 0, &err); //Search for the file of given name const char *name = "file.txt"; struct zip_stat st; zip_stat_init(&st); zip_stat(z, name, 0, &st); //Alloc memory for its uncompressed contents char *contents = new char[st.size]; //Read the compressed file zip_file *f = zip_fopen(z, name, 0); zip_fread(f, contents, st.size); zip_fclose(f); //And close the archive zip_close(z); //Do something with the contents //delete allocated memory delete[] contents; }
Minizip有一个示例程序来演示它的用法 – 文件名为minizip.c和miniunz.c。
更新:我有几分钟的时间,所以我为你提供了这个快速,简单的骨头的例子。 这是非常臭C,我不会使用它没有重大改进。 希望这足以让你现在去。
// uzip.c - Simple example of using the minizip API. // Do not use this code as is! It is educational only, and probably // riddled with errors and leaks! #include <stdio.h> #include <string.h> #include "unzip.h" #define dir_delimter '/' #define MAX_FILENAME 512 #define READ_SIZE 8192 int main( int argc, char **argv ) { if ( argc < 2 ) { printf( "usage:\n%s {file to unzip}\n", argv[ 0 ] ); return -1; } // Open the zip file unzFile *zipfile = unzOpen( argv[ 1 ] ); if ( zipfile == NULL ) { printf( "%s: not found\n" ); return -1; } // Get info about the zip file unz_global_info global_info; if ( unzGetGlobalInfo( zipfile, &global_info ) != UNZ_OK ) { printf( "could not read file global info\n" ); unzClose( zipfile ); return -1; } // Buffer to hold data read from the zip file. char read_buffer[ READ_SIZE ]; // Loop to extract all files uLong i; for ( i = 0; i < global_info.number_entry; ++i ) { // Get info about current file. unz_file_info file_info; char filename[ MAX_FILENAME ]; if ( unzGetCurrentFileInfo( zipfile, &file_info, filename, MAX_FILENAME, NULL, 0, NULL, 0 ) != UNZ_OK ) { printf( "could not read file info\n" ); unzClose( zipfile ); return -1; } // Check if this entry is a directory or file. const size_t filename_length = strlen( filename ); if ( filename[ filename_length-1 ] == dir_delimter ) { // Entry is a directory, so create it. printf( "dir:%s\n", filename ); mkdir( filename ); } else { // Entry is a file, so extract it. printf( "file:%s\n", filename ); if ( unzOpenCurrentFile( zipfile ) != UNZ_OK ) { printf( "could not open file\n" ); unzClose( zipfile ); return -1; } // Open a file to write out the data. FILE *out = fopen( filename, "wb" ); if ( out == NULL ) { printf( "could not open destination file\n" ); unzCloseCurrentFile( zipfile ); unzClose( zipfile ); return -1; } int error = UNZ_OK; do { error = unzReadCurrentFile( zipfile, read_buffer, READ_SIZE ); if ( error < 0 ) { printf( "error %d\n", error ); unzCloseCurrentFile( zipfile ); unzClose( zipfile ); return -1; } // Write data to file. if ( error > 0 ) { fwrite( read_buffer, error, 1, out ); // You should check return of fwrite... } } while ( error > 0 ); fclose( out ); } unzCloseCurrentFile( zipfile ); // Go the the next entry listed in the zip file. if ( ( i+1 ) < global_info.number_entry ) { if ( unzGoToNextFile( zipfile ) != UNZ_OK ) { printf( "cound not read next file\n" ); unzClose( zipfile ); return -1; } } } unzClose( zipfile ); return 0; }
我使用MinGW / MSYS在Windows上构build和testing,如下所示:
contrib/minizip/$ gcc -I../.. -o unzip uzip.c unzip.c ioapi.c ../../libz.a contrib/minizip/$ ./unzip.exe /j/zlib-125.zip
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