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package encoding_hxa
import "core:fmt"
Read_Error :: enum {
None,
Short_Read,
Invalid_Data,
Unable_To_Read_File,
}
read :: proc(data: []byte, filename := "<input>", print_error := false, allocator := context.allocator, loc := #caller_location) -> (file: File, err: Read_Error) {
Reader :: struct {
filename: string,
data: []byte,
offset: int,
print_error: bool,
}
read_value :: proc(r: ^Reader, $T: typeid) -> (value: T, err: Read_Error) {
remaining := len(r.data) - r.offset
if remaining < size_of(T) {
if r.print_error {
fmt.eprintf("file '%s' failed to read value at offset %v\n", r.filename, r.offset)
}
err = .Short_Read
return
}
ptr := raw_data(r.data[r.offset:])
value = (^T)(ptr)^
r.offset += size_of(T)
return
}
read_array :: proc(r: ^Reader, $T: typeid, count: int) -> (value: []T, err: Read_Error) {
remaining := len(r.data) - r.offset
if remaining < size_of(T)*count {
if r.print_error {
fmt.eprintf("file '%s' failed to read array of %d elements at offset %v\n",
r.filename, count, r.offset)
}
err = .Short_Read
return
}
ptr := raw_data(r.data[r.offset:])
value = ([^]T)(ptr)[:count]
r.offset += size_of(T)*count
return
}
read_string :: proc(r: ^Reader, count: int) -> (string, Read_Error) {
buf, err := read_array(r, byte, count)
return string(buf), err
}
read_name :: proc(r: ^Reader) -> (value: string, err: Read_Error) {
len := read_value(r, u8) or_return
data := read_array(r, byte, int(len)) or_return
return string(data[:len]), nil
}
read_meta :: proc(r: ^Reader, capacity: u32le, allocator := context.allocator, loc := #caller_location) -> (meta_data: []Meta, err: Read_Error) {
meta_data = make([]Meta, int(capacity), allocator=allocator)
count := 0
for &m in meta_data {
m.name = read_name(r) or_return
type := read_value(r, Meta_Value_Type) or_return
if type > max(Meta_Value_Type) {
if r.print_error {
fmt.eprintf("HxA Error: file '%s' has meta value type %d. Maximum value is %d\n",
r.filename, u8(type), u8(max(Meta_Value_Type)))
}
err = .Invalid_Data
return
}
array_length := read_value(r, u32le) or_return
switch type {
case .Int64: m.value = read_array(r, i64le, int(array_length)) or_return
case .Double: m.value = read_array(r, f64le, int(array_length)) or_return
case .Node: m.value = read_array(r, Node_Index, int(array_length)) or_return
case .Text: m.value = read_string(r, int(array_length)) or_return
case .Binary: m.value = read_array(r, byte, int(array_length)) or_return
case .Meta: m.value = read_meta(r, array_length) or_return
}
count += 1
}
meta_data = meta_data[:count]
return
}
read_layer_stack :: proc(r: ^Reader, capacity: u32le, allocator := context.allocator, loc := #caller_location) -> (layers: Layer_Stack, err: Read_Error) {
stack_count := read_value(r, u32le) or_return
layer_count := 0
layers = make(Layer_Stack, stack_count, allocator=allocator, loc=loc)
for &layer in layers {
layer.name = read_name(r) or_return
layer.components = read_value(r, u8) or_return
type := read_value(r, Layer_Data_Type) or_return
if type > max(Layer_Data_Type) {
if r.print_error {
fmt.eprintf("HxA Error: file '%s' has layer data type %d. Maximum value is %d\n",
r.filename, u8(type), u8(max(Layer_Data_Type)))
}
err = .Invalid_Data
return
}
data_len := int(layer.components) * int(capacity)
switch type {
case .Uint8: layer.data = read_array(r, u8, data_len) or_return
case .Int32: layer.data = read_array(r, i32le, data_len) or_return
case .Float: layer.data = read_array(r, f32le, data_len) or_return
case .Double: layer.data = read_array(r, f64le, data_len) or_return
}
layer_count += 1
}
layers = layers[:layer_count]
return
}
if len(data) < size_of(Header) {
if print_error {
fmt.eprintf("HxA Error: file '%s' has no header\n", filename)
}
err = .Short_Read
return
}
context.allocator = allocator
header := cast(^Header)raw_data(data)
if (header.magic_number != MAGIC_NUMBER) {
if print_error {
fmt.eprintf("HxA Error: file '%s' has invalid magic number 0x%x\n", filename, header.magic_number)
}
err = .Invalid_Data
return
}
r := &Reader{
filename = filename,
data = data[:],
offset = size_of(Header),
print_error = print_error,
}
node_count := 0
file.header = header^
file.nodes = make([]Node, header.internal_node_count, allocator=allocator, loc=loc)
file.allocator = allocator
defer if err != nil {
nodes_destroy(file.nodes)
file.nodes = nil
}
defer file.nodes = file.nodes[:node_count]
for _ in 0..<header.internal_node_count {
node := &file.nodes[node_count]
type := read_value(r, Node_Type) or_return
if type > max(Node_Type) {
if r.print_error {
fmt.eprintf("HxA Error: file '%s' has node type %d. Maximum value is %d\n",
r.filename, u8(type), u8(max(Node_Type)))
}
err = .Invalid_Data
return
}
node_count += 1
node.meta_data = read_meta(r, read_value(r, u32le) or_return) or_return
switch type {
case .Meta_Only:
// Okay
case .Geometry:
g: Node_Geometry
g.vertex_count = read_value(r, u32le) or_return
g.vertex_stack = read_layer_stack(r, g.vertex_count, loc=loc) or_return
g.edge_corner_count = read_value(r, u32le) or_return
g.corner_stack = read_layer_stack(r, g.edge_corner_count, loc=loc) or_return
if header.version > 2 {
g.edge_stack = read_layer_stack(r, g.edge_corner_count, loc=loc) or_return
}
g.face_count = read_value(r, u32le) or_return
g.face_stack = read_layer_stack(r, g.face_count, loc=loc) or_return
node.content = g
case .Image:
img: Node_Image
img.type = read_value(r, Image_Type) or_return
dimensions := int(img.type)
if img.type == .Image_Cube {
dimensions = 2
}
img.resolution = {1, 1, 1}
for d in 0..<dimensions {
img.resolution[d] = read_value(r, u32le) or_return
}
size := img.resolution[0]*img.resolution[1]*img.resolution[2]
if img.type == .Image_Cube {
size *= 6
}
img.image_stack = read_layer_stack(r, size) or_return
node.content = img
}
}
return
}
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