英文:
Writing binary data to a file (from hexdump)
问题
我尝试在Go中做一些非常简单的事情，但我找不到任何资源。
我收到一个十六进制转储，并且我想将其写入文件，但是两个文件（源文件和目标文件）的内容根本不匹配。目前我找到的唯一方法是手动在每两个字符之间添加\x。
我尝试循环遍历我的字符串并添加\x，字符串看起来相同，但输出非常不同。
这段代码手动工作：
binary.Write(f, binary.LittleEndian, []byte("\x00\x00\x00\x04\x0A\xFA\x64\xA7\x00\x03\x31\x30"))
但是我无法从字符串"000000040afa64a700033130"中实现相同的效果...
这是我目前的做法（这是我在Python3中的做法）：
text := "000000040afa64a700033130"
j := 0
f, _ := os.OpenFile("gotest", os.O_WRONLY|os.O_CREATE, 0600)
for i := 0; i < len(text); i += 2 {
if (i + 2) <= len(text) {
j = i + 2
}
value, _ := strconv.ParseInt(hex, 16, 8)
binary.Write(f, binary.LittleEndian,value)
s = append(s, value)
}
英文:
I try to do something very simple in Go but I do not manage to find any resources.
I receive an hexadump and I want to write it to a file but the content of both files (src and dst) do not match at all. Currently the only way I have find it's to manually add \x every 2 characters.
I tried to loop over my string and add \x the string looks identical but output is very different.
This code manually works:
binary.Write(f, binary.LittleEndian, []byte("\x00\x00\x00\x04\x0A\xFA\x64\xA7\x00\x03\x31\x30"))
But I did not manage to make it from string "000000040afa64a700033130"...
What i currently do (this is what I do in python3):
text := "000000040afa64a700033130"
j := 0
f, _ := os.OpenFile("gotest", os.O_WRONLY|os.O_CREATE, 0600)
for i := 0; i < len(text); i += 2 {
if (i + 2) <= len(text) {
j = i + 2
}
value, _ := strconv.ParseInt(hex, 16, 8)
binary.Write(f, binary.LittleEndian,value)
s = append(s, value)
}
答案1
得分: 1
如果您的十六进制数据以字符串形式存在，并且您想要写入原始字节，您需要先进行转换，更简单的方法是使用hex.Decode。
import (
"encoding/hex"
"io/ioutil"
)
func foo() {
stringData := []byte("48656c6c6f20476f7068657221")
hexData := make([]byte, hex.DecodedLen(len(stringData)))
_, err := hex.Decode(stringData, hexData)
// 处理错误
err := ioutil.WriteFile("filename", hexData, 0644)
// 处理错误
}
根据您的使用情况，您可以切换到使用ioutil.WriteFile。它将给定的字节切片写入文件，如果文件不存在，则创建该文件，如果文件已存在，则将其截断。
英文:
If your hex data is in the from of a string and you want to write the raw bytes you'll have to convert it first, the easier way would be to use hex.Decode.
import (
"encoding/hex"
"io/ioutil"
)
func foo() {
stringData := []byte("48656c6c6f20476f7068657221")
hexData := make([]byte, hex.DecodedLen(len(stringData)))
_, err := hex.Decode(stringData, hexData)
// handle err
err := ioutil.WriteFile("filename", hexData, 0644)
// handle err
}
Based on your use you could swap over to using ioutil.WriteFile. It writes the given byte slice to a file, creating the file if it doesn't exist or truncating it in the case it already exists.
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