mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-09-03 14:23:18 +02:00
559a6585ef
byuu says:
First 32 instructions implemented in the TLCS900H disassembler. Only 992
to go!
I removed the use of anonymous namespaces in nall. It was something I
rarely used, because it rarely did what I wanted.
I updated all nested namespaces to use C++17-style namespace Foo::Bar {}
syntax instead of classic C++-style namespace Foo { namespace Bar {}}.
I updated ruby::Video::acquire() to return a struct, so we can use C++17
structured bindings. Long term, I want to get away from all functions
that take references for output only. Even though C++ botched structured
bindings by not allowing you to bind to existing variables, it's even
worse to have function calls that take arguments by reference and then
write to them. From the caller side, you can't tell the value is being
written, nor that the value passed in doesn't matter, which is terrible.
89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
#pragma once
|
|
|
|
namespace nall::Beat::Single {
|
|
|
|
inline auto apply(array_view<uint8_t> source, array_view<uint8_t> beat, maybe<string&> manifest = {}, maybe<string&> result = {}) -> maybe<vector<uint8_t>> {
|
|
#define error(text) { if(result) *result = {"error: ", text}; return {}; }
|
|
#define warning(text) { if(result) *result = {"warning: ", text}; return target; }
|
|
#define success() { if(result) *result = ""; return target; }
|
|
if(beat.size() < 19) error("beat size mismatch");
|
|
|
|
vector<uint8_t> target;
|
|
|
|
uint beatOffset = 0;
|
|
auto read = [&]() -> uint8_t {
|
|
return beat[beatOffset++];
|
|
};
|
|
|
|
auto decode = [&]() -> uint64_t {
|
|
uint64_t data = 0, shift = 1;
|
|
while(true) {
|
|
uint8_t x = read();
|
|
data += (x & 0x7f) * shift;
|
|
if(x & 0x80) break;
|
|
shift <<= 7;
|
|
data += shift;
|
|
}
|
|
return data;
|
|
};
|
|
|
|
auto write = [&](uint8_t data) {
|
|
target.append(data);
|
|
};
|
|
|
|
if(read() != 'B') error("beat header invalid");
|
|
if(read() != 'P') error("beat header invalid");
|
|
if(read() != 'S') error("beat header invalid");
|
|
if(read() != '1') error("beat version mismatch");
|
|
if(decode() != source.size()) error("source size mismatch");
|
|
uint targetSize = decode();
|
|
target.reserve(targetSize);
|
|
uint metadataSize = decode();
|
|
for(uint n : range(metadataSize)) {
|
|
auto data = read();
|
|
if(manifest) manifest->append((char)data);
|
|
}
|
|
|
|
enum : uint { SourceRead, TargetRead, SourceCopy, TargetCopy };
|
|
|
|
uint sourceRelativeOffset = 0, targetRelativeOffset = 0;
|
|
while(beatOffset < beat.size() - 12) {
|
|
uint length = decode();
|
|
uint mode = length & 3;
|
|
length = (length >> 2) + 1;
|
|
|
|
if(mode == SourceRead) {
|
|
while(length--) write(source[target.size()]);
|
|
} else if(mode == TargetRead) {
|
|
while(length--) write(read());
|
|
} else {
|
|
int offset = decode();
|
|
offset = offset & 1 ? -(offset >> 1) : (offset >> 1);
|
|
if(mode == SourceCopy) {
|
|
sourceRelativeOffset += offset;
|
|
while(length--) write(source[sourceRelativeOffset++]);
|
|
} else {
|
|
targetRelativeOffset += offset;
|
|
while(length--) write(target[targetRelativeOffset++]);
|
|
}
|
|
}
|
|
}
|
|
|
|
uint32_t sourceHash = 0, targetHash = 0, beatHash = 0;
|
|
for(uint shift : range(0, 32, 8)) sourceHash |= read() << shift;
|
|
for(uint shift : range(0, 32, 8)) targetHash |= read() << shift;
|
|
for(uint shift : range(0, 32, 8)) beatHash |= read() << shift;
|
|
|
|
if(target.size() != targetSize) warning("target size mismatch");
|
|
if(sourceHash != Hash::CRC32(source).value()) warning("source hash mismatch");
|
|
if(targetHash != Hash::CRC32(target).value()) warning("target hash mismatch");
|
|
if(beatHash != Hash::CRC32({beat.data(), beat.size() - 4}).value()) warning("beat hash mismatch");
|
|
|
|
success();
|
|
#undef error
|
|
#undef warning
|
|
#undef success
|
|
}
|
|
|
|
}
|