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746919b3d2
Each skip computed an absolute offset as a 32 bit tellg plus a size product in 32 bit math (colorMapSize * colorMapSize * 4 and friends), which wraps for large values and can seek backwards. The skips are now relative to the current position with the size promoted to std::streamoff first. Offsets are unchanged for every real terrain file, so this only removes the overflow the TODO asked about. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
#include "RawChunk.h"
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#include "BinaryIO.h"
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#include "RawMesh.h"
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#include "RawHeightMap.h"
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RawChunk::RawChunk(std::ifstream& stream) {
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// Read the chunk index and info
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BinaryIO::BinaryRead(stream, m_ChunkIndex);
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BinaryIO::BinaryRead(stream, m_Width);
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BinaryIO::BinaryRead(stream, m_Height);
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BinaryIO::BinaryRead(stream, m_X);
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BinaryIO::BinaryRead(stream, m_Z);
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m_HeightMap = new RawHeightMap(stream, m_Height, m_Width);
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// We can just skip the rest of the data so we can read the next chunks, we don't need anymore data
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// Skips are relative and done in 64 bit math so large sizes can't wrap around and seek backwards.
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uint32_t colorMapSize;
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BinaryIO::BinaryRead(stream, colorMapSize);
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stream.seekg(static_cast<std::streamoff>(colorMapSize) * colorMapSize * 4, std::ios::cur);
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uint32_t lightmapSize;
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BinaryIO::BinaryRead(stream, lightmapSize);
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stream.seekg(static_cast<std::streamoff>(lightmapSize), std::ios::cur);
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uint32_t colorMapSize2;
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BinaryIO::BinaryRead(stream, colorMapSize2);
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stream.seekg(static_cast<std::streamoff>(colorMapSize2) * colorMapSize2 * 4, std::ios::cur);
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uint8_t unknown;
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BinaryIO::BinaryRead(stream, unknown);
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uint32_t blendmapSize;
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BinaryIO::BinaryRead(stream, blendmapSize);
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stream.seekg(static_cast<std::streamoff>(blendmapSize), std::ios::cur);
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uint32_t pointSize;
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BinaryIO::BinaryRead(stream, pointSize);
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stream.seekg(static_cast<std::streamoff>(pointSize) * 9 * 4, std::ios::cur);
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stream.seekg(static_cast<std::streamoff>(colorMapSize) * colorMapSize, std::ios::cur);
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uint32_t endCounter;
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BinaryIO::BinaryRead(stream, endCounter);
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stream.seekg(static_cast<std::streamoff>(endCounter) * 2, std::ios::cur);
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if (endCounter != 0) {
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stream.seekg(32, std::ios::cur);
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for (int i = 0; i < 0x10; i++) {
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uint16_t finalCountdown;
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BinaryIO::BinaryRead(stream, finalCountdown);
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stream.seekg(static_cast<std::streamoff>(finalCountdown) * 2, std::ios::cur);
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}
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}
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// Generate our mesh/geo data for this chunk
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this->GenerateMesh();
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}
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RawChunk::~RawChunk() {
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if (m_Mesh) delete m_Mesh;
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if (m_HeightMap) delete m_HeightMap;
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}
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void RawChunk::GenerateMesh() {
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RawMesh* meshData = new RawMesh();
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for (int i = 0; i < m_Width; ++i) {
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for (int j = 0; j < m_Height; ++j) {
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float y = *std::next(m_HeightMap->m_FloatMap.begin(), m_Width * i + j);
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meshData->m_Vertices.push_back(NiPoint3(i, y, j));
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if (i == 0 || j == 0) continue;
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meshData->m_Triangles.push_back(m_Width * i + j);
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meshData->m_Triangles.push_back(m_Width * i + j - 1);
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meshData->m_Triangles.push_back(m_Width * (i - 1) + j - 1);
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meshData->m_Triangles.push_back(m_Width * (i - 1) + j - 1);
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meshData->m_Triangles.push_back(m_Width * (i - 1) + j);
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meshData->m_Triangles.push_back(m_Width * i + j);
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}
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}
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m_Mesh = meshData;
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}
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