英文:
Removing a memory address from standard output in Golang
问题
我正在尝试用Go语言创建一个git的克隆版本。我对Go语言特别是"os"和"io"包还不太熟悉。
问题：为什么我的函数在输出的开头返回一个内存地址（或者可能是读取的字节数？）？有没有办法将其从输出中删除，以便我得到预期的输出？
预期输出：dumpty vanilla dooby humpty donkey yikes
实际输出：blob 40\x00dumpty vanilla dooby humpty donkey yikes
命令：./my_git.sh cat-file -p <HASH>
相关代码：
if os.Args[2] == "-p" {
// 声明SHA
sha := os.Args[3]
// 将SHA转换为可读的文件路径
folder := string(sha[0:2])
blob := string(sha[2:])
filePath := ".git/objects/" + folder + "/" + blob
file, err := os.Open(filePath)
if err != nil {
log.Fatal(err)
}
r, readError := zlib.NewReader(file)
if readError != nil {
log.Fatal(readError)
}
io.Copy(os.Stdout, r)
r.Close()
}
英文:
I am attempting to create a clone of git in Go. I am new to Go, especially the "os" and "io" packages.
Question: Why is my function returning a memory address (or maybe it's the number of bytes read?) at the beginning of my output? Is there a way to remove it from the output so that I get the expected output?
Expected output: dumpty vanilla dooby humpty donkey yikes
Got: blob 40\x00dumpty vanilla dooby humpty donkey yikes
Command: ./my_git.sh cat-file -p <HASH>
Relevant Code:
if os.Args[2] == "-p" {
// Declare SHA
sha := os.Args[3]
// Convert SHA to readable file path
folder := string(sha[0:2])
blob := string(sha[2:])
filePath := ".git/objects/" + folder + "/" + blob
file, err := os.Open(filePath)
if err != nil {
log.Fatal(err)
}
r, readError := zlib.NewReader(file)
if readError != nil {
log.Fatal(readError)
}
io.Copy(os.Stdout, r)
r.Close()
}
答案1
得分: 1
blob 40\x00 是文件内容（解压缩后）的一部分。它是对象头部分：
- 对象的类型（这里是 "blob"；其他类型包括 "commit" 和 "tree"）
- 对象的大小（这里是40字节）
- 以及一个空字节
你不能简单地删除它。你必须理解头部才能理解对象内容的含义。
请参阅《Git Internals - Git Objects》一章，了解更多信息。
英文:
blob 40\x00 is literally part of the (decompressed) file content. It is the object header:
- the type of the object (here "blob"; other types include "commit" and "tree", for instance)
- the object's size in bytes (here 40)
- and a null byte
You can't just remove that. You have to understand the header to make sense of the object content proper.
See the "Git Internals - Git Objects" chapter of the git book for further information.
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