blob: f77ca6dc0987c3ec6a9718207a6a67536fb04b68 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
#pragma once
#include "endianness.h"
#include <cstddef>
#include <cstdint>
#include <stdexcept>
#include <vector>
namespace BK64 {
// Reads the fields after a resource's 64-byte header, swapping when the header names the other byte order. Throws
// when it runs out.
class ResourceReader {
public:
explicit ResourceReader(const std::vector<uint8_t>& bytes) : mBytes(bytes) {
if (bytes.size() < 0x40) {
throw std::runtime_error("the resource is under 64 bytes");
}
mSwap = (bytes[0] == (uint8_t)Torch::Endianness::Big) != (Torch::Endianness::Native == Torch::Endianness::Big);
}
template <typename T> void Read(T& value) {
if (mBytes.size() - mAt < sizeof(T)) {
throw std::runtime_error("the resource ends early");
}
for (size_t i = 0; i < sizeof(T); i++) {
((uint8_t*)&value)[mSwap ? sizeof(T) - 1 - i : i] = mBytes[mAt + i];
}
mAt += sizeof(T);
}
template <typename T> T Read() {
T value;
Read(value);
return value;
}
template <typename T> void ReadArray(T* values, size_t count) {
for (size_t i = 0; i < count; i++) {
Read(values[i]);
}
}
std::vector<uint8_t> Bytes(size_t size) {
if (mBytes.size() - mAt < size) {
throw std::runtime_error("the resource ends early");
}
mAt += size;
return std::vector<uint8_t>(mBytes.begin() + (mAt - size), mBytes.begin() + mAt);
}
private:
const std::vector<uint8_t>& mBytes;
size_t mAt = 0x40;
bool mSwap = false;
};
} // namespace BK64
|
