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Add C to Zig converter

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Further simplify struct
This commit is contained in:
Robby Zambito
2025-04-26 10:39:07 -04:00
parent 67818ed9d6
commit 983544facf
2 changed files with 54 additions and 32 deletions
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5
include/zaprus.h
View File

@@ -22,12 +22,9 @@ struct SaprusMessage {
uint16_t packet_type;
uint16_t payload_len;
union {
struct {
struct {
char dest[4];
};
} relay;
struct {
struct {
uint16_t src_port;
uint16_t dest_port;
@@ -35,8 +32,6 @@ struct SaprusMessage {
uint32_t msg_id;
char _reserved;
char options;
};
} connection;
} headers;
char *payload;

49
src/c_api.zig
View File

@@ -10,23 +10,19 @@ fn zigToCMessage(msg: ?*zaprus.Message) !?*c.SaprusMessage {
switch (m.*) {
.relay => |r| {
res.headers.relay = .{
.unnamed_0 = .{
.dest = r.header.dest,
},
};
res.payload_len = @intCast(r.payload.len);
res.payload = (try allocator.alloc(u8, r.payload.len)).ptr;
},
.connection => |con| {
res.headers.connection = .{
.unnamed_0 = .{
.src_port = con.header.src_port,
.dest_port = con.header.dest_port,
.seq_num = con.header.seq_num,
.msg_id = con.header.msg_id,
._reserved = con.header.reserved,
.options = @bitCast(con.header.options),
},
};
res.payload_len = @intCast(con.payload.len);
@@ -39,14 +35,45 @@ fn zigToCMessage(msg: ?*zaprus.Message) !?*c.SaprusMessage {
} else return null;
}
fn cToZigMessage(msg: ?*c.SaprusMessage) ?*zaprus.Message {
_ = msg;
return @constCast(&zaprus.Message{
fn cToZigMessage(msg: ?*c.SaprusMessage) !?*zaprus.Message {
if (msg) |m| {
const msg_type: zaprus.PacketType = @enumFromInt(m.*.packet_type);
var res: zaprus.Message = switch (msg_type) {
.relay => .{
.relay = .{
.header = .{ .dest = @splat(0) },
.payload = &.{0},
.header = .{
.dest = m.*.headers.relay.dest[0..4].*,
},
});
.payload = blk: {
const p = try allocator.alloc(u8, m.payload_len);
@memcpy(p, m.payload[0..m.payload_len]);
break :blk p;
},
},
},
.connection => .{
.connection = .{
.header = .{
.src_port = m.*.headers.connection.src_port,
.dest_port = m.*.headers.connection.dest_port,
.seq_num = m.*.headers.connection.seq_num,
.msg_id = m.*.headers.connection.msg_id,
.reserved = m.*.headers.connection._reserved,
.options = @bitCast(m.*.headers.connection.options),
},
.payload = blk: {
const p = try allocator.alloc(u8, m.payload_len);
@memcpy(p, m.payload[0..m.payload_len]);
break :blk p;
},
},
},
.file_transfer => return zaprus.Error.NotImplementedSaprusType,
else => return zaprus.Error.UnknownSaprusType,
};
return &res;
} else return null;
}
// client
@@ -82,7 +109,7 @@ export fn zaprus_connect(payload: [*]const u8, len: usize) ?*c.SaprusMessage {
/// ptr should be freed by the caller.
export fn zaprus_message_to_bytes(msg: c.SaprusMessage, ptr: *[*]u8, len: *usize) c_int {
if (cToZigMessage(@constCast(&msg))) |m| {
if (cToZigMessage(@constCast(&msg)) catch return 1) |m| {
const bytes = m.toBytes(allocator) catch return 1;
ptr.* = bytes.ptr;
len.* = bytes.len;