insert file in zip

apk_frauder/src/file_header.rs

@@ -1,6 +1,8 @@
 use std::io::{SeekFrom, Write};
 
 use crate::compression::CompressionMethod;
+use crate::cp437::string_to_cp437;
+use crate::error::Error;
 use crate::extra_fields::{ExtraField, GenericExtraField, Zip64ExtraField};
 use crate::{cp437, general_purpose_flags, Encoding, Signature};
 use androscalpel_serializer::{ReadSeek, Result, Serializable};
@@ -188,6 +190,36 @@ impl FileHeader {
     const SIGNATURE: Signature = Signature(0x02014b50);
     const MIN_SIZE: usize = 4 + 6 * 2 + 4 * 3 + 5 * 2 + 4 * 2;
 
+    pub fn new_default(name: &str) -> Self {
+        let mut general_purpose_flags = 0;
+        let file_name = match string_to_cp437(name) {
+            Ok(name) => name,
+            Err(Error::NotCp437) => {
+                general_purpose_flags |= general_purpose_flags::MASK_UTF8_FILENAME;
+                name.as_bytes().into()
+            }
+        };
+        FileHeader {
+            version_made_by: 768,
+            version_needed_to_extract: 0,
+            general_purpose_flags,
+            compression_method: CompressionMethod::Deflated,
+            last_mod_file_time: 0,
+            last_mod_file_data: 0,
+            crc_32: 0,
+            compressed_size: 0,
+            uncompressed_size: 0,
+            disk_number_start: 0,
+            internal_file_attributes: 0,
+            external_file_attributes: 0b1000000110100100 << 16, // TODO
+            offset_local_header: 0,
+            file_name,
+            extra_field: vec![],
+            malformed_extra_field: vec![],
+            file_comment: vec![],
+        }
+    }
+
     pub fn get_name_encoding(&self) -> Encoding {
         if self.general_purpose_flags & general_purpose_flags::MASK_UTF8_FILENAME != 0 {
             Encoding::UTF8