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Add decode support for crx

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lifegpc
2025-07-29 14:58:30 +08:00
parent 71d19cfd81
commit 70943f4a3e
9 changed files with 666 additions and 29 deletions
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217
msg_tool_macro/src/lib.rs
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@@ -74,7 +74,10 @@ pub fn struct_unpack_impl_for_num(item: TokenStream) -> TokenStream {
/// * `fvec = <len>` attribute can be used to specify a fixed vector length for Vec<_> fields.
/// * `pstring(<len_type>)` attribute can be used to specify a packed string length for String fields, where `<len_type>` can be `u8`, `u16`, `u32`, or `u64`.
/// Length is read as a prefix before the string data.
#[proc_macro_derive(StructPack, attributes(skip_pack, fstring, fstring_pad, fvec, pstring))]
/// * `pvec(<len_type>)` attribute can be used to specify a packed vector length for Vec<_> fields, where `<len_type>` can be `u8`, `u16`, `u32`, or `u64`.
/// Length is read as a prefix before the vector data.
/// * `skip_pack_if(<expr>)` attribute can be used to skip packing a field if the expression evaluates to true. The expression must be a valid Rust expression that evaluates to a boolean.
#[proc_macro_derive(StructPack, attributes(skip_pack, fstring, fstring_pad, fvec, pstring, pvec, skip_pack_if))]
pub fn struct_pack_derive(input: TokenStream) -> TokenStream {
let a = syn::parse_macro_input!(input as PackStruct);
match a {
@@ -87,6 +90,9 @@ pub fn struct_pack_derive(input: TokenStream) -> TokenStream {
let mut fixed_vec: Option<usize> = None;
let mut fstring_pad = 0u8; // Default padding byte
let mut pstring_type: Option<syn::Ident> = None;
let mut pvec_type: Option<syn::Ident> = None;
let mut cur = None;
let mut skip_if = None;
for attr in &field.attrs {
let path = attr.path();
if path.is_ident("skip_pack") {
@@ -132,6 +138,27 @@ pub fn struct_pack_derive(input: TokenStream) -> TokenStream {
Ok(())
}).unwrap();
}
} else if path.is_ident("pvec") {
if let syn::Meta::List(list) = &attr.meta {
list.parse_nested_meta(|meta| {
if meta.path.is_ident("u8") {
pvec_type = Some(syn::Ident::new("u8", meta.path.span()));
} else if meta.path.is_ident("u16") {
pvec_type = Some(syn::Ident::new("u16", meta.path.span()));
} else if meta.path.is_ident("u32") {
pvec_type = Some(syn::Ident::new("u32", meta.path.span()));
} else if meta.path.is_ident("u64") {
pvec_type = Some(syn::Ident::new("u64", meta.path.span()));
} else {
return Err(meta.error("Expected u8, u16, or u32 for pvec"));
}
Ok(())
}).unwrap();
}
} else if path.is_ident("skip_pack_if") {
if let syn::Meta::List(list) = &attr.meta {
skip_if = Some(list.parse_args::<syn::Expr>().unwrap());
}
}
}
if skipped {
@@ -150,7 +177,7 @@ pub fn struct_pack_derive(input: TokenStream) -> TokenStream {
if let Some(segment) = type_path.path.segments.last() {
if segment.ident == "String" {
if let Some(fixed_string) = fixed_string {
return quote::quote! {
cur = Some(quote::quote! {
let s = encode_string(encoding, &self.#field_name, true)?;
let mut slen = s.len();
if slen > #fixed_string {
@@ -164,35 +191,54 @@ pub fn struct_pack_derive(input: TokenStream) -> TokenStream {
for _ in slen..#fixed_string {
writer.write_all(&[#fstring_pad])?;
}
};
}
if let Some(pstring_type) = pstring_type {
});
} else if let Some(pstring_type) = pstring_type {
let write_fn = syn::Ident::new(format!("write_{}", pstring_type).as_str(), pstring_type.span());
return quote::quote! {
cur = Some(quote::quote! {
let encoded = crate::utils::encoding::encode_string(encoding, &self.#field_name, true)?;
writer.#write_fn(encoded.len() as #pstring_type)?;
writer.write_all(&encoded)?;
};
});
}
}
}
if let Some(segment) = type_path.path.segments.first() {
if segment.ident == "Vec" {
if let Some(fixed_vec) = fixed_vec {
return quote::quote! {
cur = Some(quote::quote! {
if self.#field_name.len() != #fixed_vec {
return Err(anyhow::anyhow!("Vector length was not equal to {}", #fixed_vec));
}
for item in &self.#field_name {
item.pack(writer, big, encoding)?;
}
};
});
} else if let Some(pvec_type) = pvec_type {
let write_fn = syn::Ident::new(format!("write_{}", pvec_type).as_str(), pvec_type.span());
cur = Some(quote::quote! {
let len = self.#field_name.len() as #pvec_type;
writer.#write_fn(len)?;
for item in &self.#field_name {
item.pack(writer, big, encoding)?;
}
});
}
}
}
}
quote::quote! {
self.#field_name.pack(writer, big, encoding)?;
let p = cur.unwrap_or_else(|| {
quote::quote! {
self.#field_name.pack(writer, big, encoding)?;
}
});
if let Some(skip_if) = skip_if {
quote::quote! {
if !(#skip_if) {
#p
}
}
} else {
p
}
});
let output = quote::quote! {
@@ -226,6 +272,10 @@ pub fn struct_pack_derive(input: TokenStream) -> TokenStream {
let mut fixed_string: Option<usize> = None;
let mut fixed_vec: Option<usize> = None;
let mut fstring_pad = 0u8; // Default padding byte
let mut pstring_type: Option<syn::Ident> = None;
let mut pvec_type: Option<syn::Ident> = None;
let mut cur = None;
let mut skip_if = None;
for attr in &field.attrs {
let path = attr.path();
if path.is_ident("skip_pack") {
@@ -254,6 +304,44 @@ pub fn struct_pack_derive(input: TokenStream) -> TokenStream {
}
}
}
} else if path.is_ident("pstring") {
if let syn::Meta::List(list) = &attr.meta {
list.parse_nested_meta(|meta| {
if meta.path.is_ident("u8") {
pstring_type = Some(syn::Ident::new("u8", meta.path.span()));
} else if meta.path.is_ident("u16") {
pstring_type = Some(syn::Ident::new("u16", meta.path.span()));
} else if meta.path.is_ident("u32") {
pstring_type = Some(syn::Ident::new("u32", meta.path.span()));
} else if meta.path.is_ident("u64") {
pstring_type = Some(syn::Ident::new("u64", meta.path.span()));
} else {
return Err(meta.error("Expected u8, u16, or u32 for pstring"));
}
Ok(())
}).unwrap();
}
} else if path.is_ident("pvec") {
if let syn::Meta::List(list) = &attr.meta {
list.parse_nested_meta(|meta| {
if meta.path.is_ident("u8") {
pvec_type = Some(syn::Ident::new("u8", meta.path.span()));
} else if meta.path.is_ident("u16") {
pvec_type = Some(syn::Ident::new("u16", meta.path.span()));
} else if meta.path.is_ident("u32") {
pvec_type = Some(syn::Ident::new("u32", meta.path.span()));
} else if meta.path.is_ident("u64") {
pvec_type = Some(syn::Ident::new("u64", meta.path.span()));
} else {
return Err(meta.error("Expected u8, u16, or u32 for pvec"));
}
Ok(())
}).unwrap();
}
} else if path.is_ident("skip_pack_if") {
if let syn::Meta::List(list) = &attr.meta {
skip_if = Some(list.parse_args::<syn::Expr>().unwrap());
}
}
}
if skipped {
@@ -273,7 +361,7 @@ pub fn struct_pack_derive(input: TokenStream) -> TokenStream {
if let Some(segment) = type_path.path.segments.last() {
if segment.ident == "String" {
if let Some(fixed_string) = fixed_string {
return quote::quote! {
cur = Some(quote::quote! {
let s = encode_string(encoding, &#field_name, true)?;
let mut slen = s.len();
if slen > #fixed_string {
@@ -287,27 +375,54 @@ pub fn struct_pack_derive(input: TokenStream) -> TokenStream {
for _ in slen..#fixed_string {
writer.write_all(&[#fstring_pad])?;
}
};
});
} else if let Some(pstring_type) = pstring_type {
let write_fn = syn::Ident::new(format!("write_{}", pstring_type).as_str(), pstring_type.span());
cur = Some(quote::quote! {
let encoded = crate::utils::encoding::encode_string(encoding, &#field_name, true)?;
writer.#write_fn(encoded.len() as #pstring_type)?;
writer.write_all(&encoded)?;
});
}
}
}
if let Some(segment) = type_path.path.segments.first() {
if segment.ident == "Vec" {
if let Some(fixed_vec) = fixed_vec {
return quote::quote! {
cur = Some(quote::quote! {
if #field_name.len() != #fixed_vec {
return Err(anyhow::anyhow!("Vector length was not equal to {}", #fixed_vec));
}
for item in &#field_name {
item.pack(writer, big, encoding)?;
}
};
});
} else if let Some(pvec_type) = pvec_type {
let write_fn = syn::Ident::new(format!("write_{}", pvec_type).as_str(), pvec_type.span());
cur = Some(quote::quote! {
let len = #field_name.len() as #pvec_type;
writer.#write_fn(len)?;
for item in &#field_name {
item.pack(writer, big, encoding)?;
}
});
}
}
}
}
quote::quote! {
#field_name.pack(writer, big, encoding)?;
let p = cur.unwrap_or_else(|| {
quote::quote! {
#field_name.pack(writer, big, encoding)?;
}
});
if let Some(skip_if) = skip_if {
quote::quote! {
if !(#skip_if) {
#p
}
}
} else {
p
}
}).collect();
let idents = if is_struct_like {
@@ -351,7 +466,10 @@ pub fn struct_pack_derive(input: TokenStream) -> TokenStream {
/// * `fvec = <len>` attribute can be used to specify a fixed vector length for Vec<_> fields.
/// * `pstring(<number_type>)` attribute can be used to specify a packed string length for String fields, where `<number_type>` can be `u8`, `u16`, `u32` or `u64`.
/// length is read as a prefix before the string data.
#[proc_macro_derive(StructUnpack, attributes(skip_unpack, fstring, fstring_no_trim, fvec, pstring))]
/// * `pvec(<number_type>)` attribute can be used to specify a packed vector length for Vec<_> fields, where `<number_type>` can be `u8`, `u16`, `u32` or `u64`.
/// length is read as a prefix before the vector data.
/// * `skip_unpack_if(<expr>)` attribute can be used to skip unpacking a field if the expression evaluates to true. The expression must be a valid Rust expression that evaluates to a boolean.
#[proc_macro_derive(StructUnpack, attributes(skip_unpack, fstring, fstring_no_trim, fvec, pstring, pvec, skip_unpack_if))]
pub fn struct_unpack_derive(input: TokenStream) -> TokenStream {
let sut = syn::parse_macro_input!(input as syn::ItemStruct);
let name = sut.ident;
@@ -364,6 +482,9 @@ pub fn struct_unpack_derive(input: TokenStream) -> TokenStream {
let mut fstring_no_trim = false;
let mut fixed_vec: Option<usize> = None;
let mut pstring_type: Option<syn::Ident> = None;
let mut pvec_type: Option<syn::Ident> = None;
let mut cur = None;
let mut skip_if: Option<syn::Expr> = None;
for attr in &field.attrs {
let path = attr.path();
if path.is_ident("skip_unpack") {
@@ -403,6 +524,27 @@ pub fn struct_unpack_derive(input: TokenStream) -> TokenStream {
Ok(())
}).unwrap();
}
} else if path.is_ident("pvec") {
if let syn::Meta::List(list) = &attr.meta {
list.parse_nested_meta(|meta| {
if meta.path.is_ident("u8") {
pvec_type = Some(syn::Ident::new("u8", meta.path.span()));
} else if meta.path.is_ident("u16") {
pvec_type = Some(syn::Ident::new("u16", meta.path.span()));
} else if meta.path.is_ident("u32") {
pvec_type = Some(syn::Ident::new("u32", meta.path.span()));
} else if meta.path.is_ident("u64") {
pvec_type = Some(syn::Ident::new("u64", meta.path.span()));
} else {
return Err(meta.error("Expected u8, u16, or u32 for pvec"));
}
Ok(())
}).unwrap();
}
} else if path.is_ident("skip_unpack_if") {
if let syn::Meta::List(list) = &attr.meta {
skip_if = Some(list.parse_args::<syn::Expr>().unwrap());
}
}
}
let field_name = match &field.ident {
@@ -426,32 +568,51 @@ pub fn struct_unpack_derive(input: TokenStream) -> TokenStream {
if segment.ident == "String" {
if let Some(fixed_string) = fixed_string {
let trim = syn::LitBool::new(!fstring_no_trim, field.span());
return quote::quote! {
cur = Some(quote::quote! {
let #field_name = reader.read_fstring(#fixed_string, encoding, #trim)?;
};
}
if let Some(pstring_type) = pstring_type {
});
} else if let Some(pstring_type) = pstring_type {
let read_fn = syn::Ident::new(format!("read_{}", pstring_type).as_str(), pstring_type.span());
return quote::quote! {
cur = Some(quote::quote! {
let len = reader.#read_fn()? as usize;
let #field_name = reader.read_exact_vec(len)?;
let #field_name = crate::utils::encoding::decode_to_string(encoding, &#field_name, true)?;
}
});
}
}
}
if let Some(segment) = type_path.path.segments.first() {
if segment.ident == "Vec" {
if let Some(fixed_vec) = fixed_vec {
return quote::quote! {
cur = Some(quote::quote! {
let #field_name = reader.read_struct_vec(#fixed_vec, big, encoding)?;
};
});
} else if let Some(pvec_type) = pvec_type {
let read_fn = syn::Ident::new(format!("read_{}", pvec_type).as_str(), pvec_type.span());
cur = Some(quote::quote! {
let len = reader.#read_fn()? as usize;
let #field_name = reader.read_struct_vec(len, big, encoding)?;
});
}
}
}
}
quote::quote! {
let #field_name = #field_type::unpack(&mut reader, big, encoding)?;
let p = cur.unwrap_or_else(|| {
quote::quote! {
let #field_name = #field_type::unpack(&mut reader, big, encoding)?;
}
});
if let Some(skip_if) = skip_if {
quote::quote! {
let #field_name = if !(#skip_if) {
#p
#field_name
} else {
Default::default()
};
}
} else {
p
}
}).collect();
let fields = if is_tuple_struct {