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#include "JJ2Block.h"
#include <cstring>
#include <Base/Memory.h>
#include <IO/Compression/DeflateStream.h>
using namespace Death::Memory;
using namespace Death::IO::Compression;
namespace Jazz2::Compatibility
{
JJ2Block::JJ2Block(std::unique_ptr<Stream>& s, std::int32_t length, std::int32_t uncompressedLength)
: _length(0), _offset(0)
{
if (uncompressedLength > 0) {
s->Seek(2, SeekOrigin::Current);
_buffer = std::make_unique<uint8_t[]>(uncompressedLength);
DeflateStream uc(*s, length - 2);
uc.Read(_buffer.get(), uncompressedLength);
_length = (uc.IsValid() ? uncompressedLength : 0);
} else {
_buffer = std::make_unique<uint8_t[]>(length);
s->Read(_buffer.get(), length);
_length = length;
}
}
void JJ2Block::SeekTo(std::int32_t offset)
{
_offset = offset;
}
void JJ2Block::DiscardBytes(std::int32_t length)
{
_offset += length;
}
bool JJ2Block::ReadBool()
{
if (_offset >= _length) {
_offset = INT32_MAX;
return false;
}
return _buffer[_offset++] != 0x00;
}
std::uint8_t JJ2Block::ReadByte()
{
if (_offset >= _length) {
_offset = INT32_MAX;
return 0;
}
return _buffer[_offset++];
}
std::int16_t JJ2Block::ReadInt16()
{
if (_offset > _length - 2) {
_offset = INT32_MAX;
return false;
}
std::int16_t result;
std::memcpy(&result, &_buffer[_offset], sizeof(result));
_offset += sizeof(result);
return AsLE(result);
}
std::uint16_t JJ2Block::ReadUInt16()
{
if (_offset > _length - 2) {
_offset = INT32_MAX;
return false;
}
std::uint16_t result;
std::memcpy(&result, &_buffer[_offset], sizeof(result));
_offset += sizeof(result);
return AsLE(result);
}
std::int32_t JJ2Block::ReadInt32()
{
if (_offset > _length - 4) {
_offset = INT32_MAX;
return false;
}
std::int32_t result;
std::memcpy(&result, &_buffer[_offset], sizeof(result));
_offset += sizeof(result);
return AsLE(result);
}
std::uint32_t JJ2Block::ReadUInt32()
{
if (_offset > _length - 4) {
_offset = INT32_MAX;
return false;
}
std::uint32_t result;
std::memcpy(&result, &_buffer[_offset], sizeof(result));
_offset += sizeof(result);
return AsLE(result);
}
std::int32_t JJ2Block::ReadUint7bitEncoded()
{
std::int32_t result = 0;
while (true) {
if (_offset >= _length) {
_offset = INT32_MAX;
break;
}
std::uint8_t current = _buffer[_offset++];
result |= (current & 0x7F);
if (current >= 0x80) {
result <<= 7;
} else {
break;
}
}
return result;
}
float JJ2Block::ReadFloat()
{
if (_offset > _length - 4) {
_offset = INT32_MAX;
return false;
}
float result;
std::memcpy(&result, &_buffer[_offset], sizeof(result));
_offset += sizeof(result);
return AsLE(result);
}
float JJ2Block::ReadFloatEncoded()
{
return ((float)ReadInt32() / 65536.0f);
}
void JJ2Block::ReadRawBytes(std::uint8_t* dst, std::int32_t length)
{
std::int32_t bytesLeft = _length - _offset;
bool endOfStream = false;
if (length > bytesLeft) {
length = bytesLeft;
endOfStream = true;
}
if (length > 0) {
std::memcpy(dst, _buffer.get() + _offset, length);
}
if (endOfStream) {
_offset = INT32_MAX;
} else {
_offset += length;
}
}
StringView JJ2Block::ReadString(std::int32_t length, bool trimToNull)
{
std::int32_t bytesLeft = _length - _offset;
bool endOfStream = false;
if (length > bytesLeft) {
length = bytesLeft;
endOfStream = true;
}
std::int32_t realLength = length;
if (trimToNull) {
for (std::int32_t i = 0; i < realLength; i++) {
if (_buffer[_offset + i] == '\0') {
realLength = i;
break;
}
}
} else {
while (realLength > 0 && (_buffer[_offset + realLength - 1] == '\0' || _buffer[_offset + realLength - 1] == ' ')) {
realLength--;
}
}
StringView result((const char*)&_buffer[_offset], realLength);
if (endOfStream) {
_offset = INT32_MAX;
} else {
_offset += length;
}
return result;
}
}
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