我在使用libarchive
版本3.3.2时遇到问题。我编写了一个程序来读取7z文件中的选定条目,如下所示:
file.7z
|__ file.xml
|__ file.fog
|__ file_1.fog
但是,该程序无法读取我大多数文件的
file_1.fog
,也无法读取某些文件的file.fog
。我尝试使用archive_error_string()
查看会发生什么,错误是corrupted archive
或truncated RAR archive
或Decompressing internal error
。这是故障代码:
void list_archive(string name) {
struct archive *a;
struct archive_entry *entry;
// create new archive struct for the file
a = archive_read_new();
archive_read_support_filter_all(a);
archive_read_support_format_all(a);
// open 7z file
int r = archive_read_open_filename(a, name.c_str(), 1024);
if (r != ARCHIVE_OK) {
cout << "cannot read file: " << name << endl;
cout << "read error: " << archive_error_string(a) << endl;
}
// looping through entries
for (;;) {
int status = archive_read_next_header(a, &entry);
// if there's no more header
if (status != ARCHIVE_OK) break;
// print some status messages to stdout
string pathname(archive_entry_pathname(entry));
cout << "working on: " << pathname << endl;
size_t entry_size = archive_entry_size(entry);
// load the entry's content
char * content;
content = (char*)malloc(entry_size);
r = archive_read_data(a, content, entry_size);
// check if archive_read_data was successful
if (r > 0) {
cout << "read " << r << " of " << entry_size << " bytes successfully\n";
// we are interested in .fog file only
if (pathname.back() == 'g') {
// do something with the .fog file
}
}
else // usually the error happens here
if (archive_errno(a) != ARCHIVE_OK) cout << "read error: " << archive_error_string(a) << endl;
// free the content and clear the entry
archive_read_data_skip(a);
free(content);
archive_entry_clear(entry);
cout << "-----" << endl;
}
// we are done with the current archive, free it
r = archive_read_free(a);
if (r != ARCHIVE_OK) {
cout << "Failed to free archive object. Error: " << archive_error_string(a) << endl;
exit(1);
}
}
最佳答案
我发现了麻烦的制造者,如果将来的用户有同样的问题,请在这里回答。
int r = archive_read_open_filename(a, name.c_str(), 1024);
显然
1024
对于缓冲区大小而言太小。我将其增加到102400
并能够读取/提取所有文件。关于c++ - libarchive在某些条目上返回错误,而7z可以正常提取,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/49702764/