英文:
Add file to zip archive without compression
问题
在Go语言中，我们如何将文件添加到zip归档文件中而不进行压缩？
以下是一个示例代码，展示了如何在Go中创建一个不进行压缩的zip归档文件：
package main
import (
"archive/zip"
"io"
"os"
)
func main() {
// 创建一个新的zip文件
zipFile, err := os.Create("example.zip")
if err != nil {
panic(err)
}
defer zipFile.Close()
// 创建一个zip.Writer
zipWriter := zip.NewWriter(zipFile)
defer zipWriter.Close()
// 添加文件到zip归档文件中
file, err := os.Open("file.txt")
if err != nil {
panic(err)
}
defer file.Close()
// 创建一个zip文件中的文件
zipFileInArchive, err := zipWriter.Create("file.txt")
if err != nil {
panic(err)
}
// 将文件内容复制到zip文件中的文件中
_, err = io.Copy(zipFileInArchive, file)
if err != nil {
panic(err)
}
}
在这个示例中，我们使用archive/zip包来创建一个zip归档文件，并将文件添加到其中。通过使用zipWriter.Create方法创建一个zip文件中的文件，并将文件内容复制到该文件中，我们可以实现将文件添加到zip归档文件中而不进行压缩。
请注意，这只是一个简单的示例，你可能需要根据你的具体需求进行适当的修改。
英文:
In Go, how do we add a file to a zip archive without compression?
For context, I'm following along with an IBM tutorial to create an epub zip file. It shows the following Python code:
import zipfile, os
def create_archive(path='/path/to/our/epub/directory'):
'''Create the ZIP archive. The mimetype must be the first file in the archive
and it must not be compressed.'''
epub_name = '%s.epub' % os.path.basename(path)
# The EPUB must contain the META-INF and mimetype files at the root, so
# we'll create the archive in the working directory first and move it later
os.chdir(path)
# Open a new zipfile for writing
epub = zipfile.ZipFile(epub_name, 'w')
# Add the mimetype file first and set it to be uncompressed
epub.write(MIMETYPE, compress_type=zipfile.ZIP_STORED)
# For the remaining paths in the EPUB, add all of their files
# using normal ZIP compression
for p in os.listdir('.'):
for f in os.listdir(p):
epub.write(os.path.join(p, f)), compress_type=zipfile.ZIP_DEFLATED)
epub.close()
In this example, the file mimetype (which has content application/epub+zip only) must not be compressed.
The Go documentation does provide one example of writing to a zip archive, but all files are compressed.
答案1
得分: 7
有两种方法可以将文件添加到zip.Writer中：Create方法和CreateHeader方法。Create方法只允许您指定文件名，而CreateHeader方法提供了更多的灵活性，包括设置压缩方法的能力。
例如：
w, err := zipwriter.CreateHeader(&zip.FileHeader{
Name: filename,
Method: zip.Store,
})
现在，您可以像Go文档中的示例代码一样向w写入数据，它将以无压缩的方式存储在zip文件中。
英文:
There are two methods to add a file to file to a zip.Writer: the Create method and the CreateHeader. While Create only lets you specify a filename, the CreateHeader method gives more flexibility including the ability to set the compression method.
For example:
w, err := zipwriter.CreateHeader(&zip.FileHeader{
Name: filename,
Method: zip.Store,
})
You can now write data to w the same as in the example code from the Go documentation and it will be stored in the zip file without compression.
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