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Make C struct match the binary API more closely

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Also make the internal conversion function return errors properly
This commit is contained in:
Robby Zambito
2025-04-26 10:01:56 -04:00
parent a1b3c07f0e
commit c490d4eec6
2 changed files with 24 additions and 26 deletions
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9
include/zaprus.h
View File

@@ -20,13 +20,12 @@ struct SaprusMessage* zaprus_connect(const char* payload, size_t len);
struct SaprusMessage {
uint16_t packet_type;
uint16_t payload_len;
union {
struct {
struct {
char dest[4];
};
size_t payload_len;
char *payload;
} relay;
struct {
struct {
@@ -37,10 +36,10 @@ struct SaprusMessage {
char _reserved;
char options;
};
size_t payload_len;
char *payload;
} connection;
};
} headers;
char *payload;
};
// ptr should be freed by the caller.

41
src/c_api.zig
View File

@@ -2,38 +2,38 @@ const c = @cImport({
@cInclude("zaprus.h");
});
fn zigToCMessage(msg: ?*zaprus.Message) ?*c.SaprusMessage {
fn zigToCMessage(msg: ?*zaprus.Message) !?*c.SaprusMessage {
if (msg) |m| {
var res = c.SaprusMessage{
.packet_type = @intFromEnum(m.*),
};
switch (m.*) {
.relay => |r| {
res.unnamed_0 = .{ .relay = .{
res.headers.relay = .{
.unnamed_0 = .{
.dest = r.header.dest,
},
.payload_len = r.payload.len,
.payload = (allocator.alloc(u8, r.payload.len) catch return null).ptr,
} };
};
res.payload_len = @intCast(r.payload.len);
res.payload = (try allocator.alloc(u8, r.payload.len)).ptr;
},
.connection => |con| {
res.unnamed_0 = .{
.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),
},
.payload_len = con.payload.len,
.payload = (allocator.alloc(u8, con.payload.len) catch return null).ptr,
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);
res.payload = (try allocator.alloc(u8, con.payload.len)).ptr;
},
else => return null,
.file_transfer => return zaprus.Error.NotImplementedSaprusType,
else => return zaprus.Error.UnknownSaprusType,
}
return &res;
} else return null;
@@ -72,7 +72,7 @@ export fn zaprus_send_initial_connection(payload: [*]const u8, len: usize, initi
export fn zaprus_connect(payload: [*]const u8, len: usize) ?*c.SaprusMessage {
if (SaprusClient.connect(payload[0..len], allocator)) |msg| {
return zigToCMessage(@constCast(&(msg.?)));
return zigToCMessage(@constCast(&(msg.?))) catch null;
} else |_| {
return null;
}
@@ -93,7 +93,7 @@ export fn zaprus_message_to_bytes(msg: c.SaprusMessage, ptr: *[*]u8, len: *usize
/// Return value should be destroyed with zaprus_message_deinit.
export fn zaprus_message_from_bytes(bytes: [*]const u8, len: usize) ?*c.SaprusMessage {
if (zaprus.Message.fromBytes(bytes[0..len], allocator)) |msg| {
return zigToCMessage(@constCast(&msg));
return zigToCMessage(@constCast(&msg)) catch null;
} else |_| return null;
}
@@ -107,7 +107,6 @@ const std = @import("std");
const zaprus = @import("./root.zig");
const SaprusClient = zaprus.Client;
// const SaprusMessage = zaprus.Message;
const allocator = std.heap.c_allocator;