mirror of https://github.com/daffainfo/nuclei.git
72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
package structs
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import (
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_ "embed"
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"github.com/projectdiscovery/gostruct"
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)
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// StructsUnpack the byte slice (presumably packed by Pack(format, msg)) according to the given format.
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// The result is a []interface{} slice even if it contains exactly one item.
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// The byte slice must contain not less the amount of data required by the format
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// (len(msg) must more or equal CalcSize(format)).
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// Ex: structs.Unpack(">I", buff[:nb])
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func Unpack(format string, msg []byte) ([]interface{}, error) {
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return gostruct.UnPack(buildFormatSliceFromStringFormat(format), msg)
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}
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// StructsPack returns a byte slice containing the values of msg slice packed according to the given format.
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// The items of msg slice must match the values required by the format exactly.
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// Ex: structs.pack("H", 0)
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func Pack(formatStr string, msg interface{}) ([]byte, error) {
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var args []interface{}
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switch v := msg.(type) {
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case []interface{}:
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args = v
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default:
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args = []interface{}{v}
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}
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format := buildFormatSliceFromStringFormat(formatStr)
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var idxMsg int
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for _, f := range format {
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switch f {
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case "<", ">", "!":
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case "h", "H", "i", "I", "l", "L", "q", "Q", "b", "B":
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switch v := args[idxMsg].(type) {
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case int64:
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args[idxMsg] = int(v)
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}
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idxMsg++
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}
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}
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return gostruct.Pack(format, args)
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}
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// StructsCalcSize returns the number of bytes needed to pack the values according to the given format.
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func StructsCalcSize(format string) (int, error) {
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return gostruct.CalcSize(buildFormatSliceFromStringFormat(format))
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}
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func buildFormatSliceFromStringFormat(format string) []string {
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var formats []string
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temp := ""
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for _, c := range format {
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if c >= '0' && c <= '9' {
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temp += string(c)
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} else {
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if temp != "" {
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formats = append(formats, temp+string(c))
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temp = ""
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} else {
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formats = append(formats, string(c))
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}
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}
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}
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if temp != "" {
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formats = append(formats, temp)
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}
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return formats
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}
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