From 475341ffb4df574a7aa3d255fe00eeae18c21928 Mon Sep 17 00:00:00 2001
From: jaketothepast <windlejacob12@gmail.com>
Date: Tue, 25 Apr 2023 09:09:32 -0400
Subject: [PATCH] Trying to parse field definitions

---
 src/file.jl | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/src/file.jl b/src/file.jl
index f0dfc8f..0bd01ff 100644
--- a/src/file.jl
+++ b/src/file.jl
@@ -30,10 +30,17 @@ mutable struct RecordHeader
     local_mesg_type::Int64
 end
 
+struct FieldDefinition
+    number::UInt8
+    sz_bytes::UInt8
+    base_type::AbstractString # Defined in mesg_num.jl
+end
+
 mutable struct DefinitionBody
     architecture::AbstractString
     global_mesg_type::AbstractString # Read from mesg_num.jl using the bytes in this field.
     num_fields::UInt8
+    field_definitions::Vector{FieldDefinition}
 end
 
 mutable struct DataBody
@@ -123,6 +130,14 @@ function decode_header(v::Vector{UInt8})::RecordHeader
     record
 end
 
+function parse_field(bytes::Vector{UInt8})::FieldDefinition
+    FieldDefinition(
+        bytes[1],
+        bytes[2],
+        get_field_definition_string(bytes[3])
+    )
+end
+
 """
     read_record_content!(f::FITFileReader, hdr::RecordHeader)::Union{DefinitionBody, DataBody}
 
@@ -134,7 +149,11 @@ function read_record_content!(f::FITFileReader, hdr::RecordHeader)::Union{Defini
         # Read the fixed 5 bytes first.
         def_header_bytes = read_bytes!(f, 5)
         def_header_fields = read_bytes!(f, def_header_bytes[end] * 3)
-        
+
+        # Should always be a multiple of 3
+        # TODO: There is a missing byte here that complicates parsing
+        field_definitions = [parse_field(def_header_bytes[i:i+2]) for i ∈ 1:3:length(def_header_fields)]
+
         # See if there is developer data
         def_header_developer_flag = read_bytes!(f, 1)
         if def_header_developer_flag[1] > 0x00
@@ -148,7 +167,8 @@ function read_record_content!(f::FITFileReader, hdr::RecordHeader)::Union{Defini
         DefinitionBody(
             def_header_bytes[2] == 0 ? "littleendian" : "bigendian",
             global_mesg_type,
-            def_header_bytes[end]
+            def_header_bytes[end],
+            field_definitions
         )
     end
 end