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dtStatus dtDecompressTileCacheLayer(dtTileCacheAlloc* alloc, dtTileCacheCompressor* comp,
unsigned char* compressed, const int compressedSize,
dtTileCacheLayer** layerOut)
{
dtAssert(alloc);
dtAssert(comp);
if (!layerOut)
return DT_FAILURE | DT_INVALID_PARAM;
if (!compressed)
return DT_FAILURE | DT_INVALID_PARAM;
*layerOut = 0;
dtTileCacheLayerHeader* compressedHeader = (dtTileCacheLayerHeader*)compressed;
if (compressedHeader->magic != DT_TILECACHE_MAGIC)
return DT_FAILURE | DT_WRONG_MAGIC;
if (compressedHeader->version != DT_TILECACHE_VERSION)
return DT_FAILURE | DT_WRONG_VERSION;
const int layerSize = dtAlign4(sizeof(dtTileCacheLayer));
const int headerSize = dtAlign4(sizeof(dtTileCacheLayerHeader));
const int gridSize = (int)compressedHeader->width * (int)compressedHeader->height;
const int bufferSize = layerSize + headerSize + gridSize*4;
unsigned char* buffer = (unsigned char*)alloc->alloc(bufferSize);
if (!buffer)
return DT_FAILURE | DT_OUT_OF_MEMORY;
memset(buffer, 0, bufferSize);
dtTileCacheLayer* layer = (dtTileCacheLayer*)buffer;
dtTileCacheLayerHeader* header = (dtTileCacheLayerHeader*)(buffer + layerSize);
unsigned char* grids = buffer + layerSize + headerSize;
const int gridsSize = bufferSize - (layerSize + headerSize);
// Copy header
memcpy(header, compressedHeader, headerSize);
// Decompress grid.
int size = 0;
dtStatus status = comp->decompress(compressed+headerSize, compressedSize-headerSize,
grids, gridsSize, &size);
if (dtStatusFailed(status))
{
alloc->free(buffer);
return status;
}
layer->header = header;
layer->heights = grids;
layer->areas = grids + gridSize;
layer->cons = grids + gridSize*2;
layer->regs = grids + gridSize*3;
*layerOut = layer;
return DT_SUCCESS;
}
bool dtTileCacheHeaderSwapEndian(unsigned char* data, const int dataSize)
{
dtIgnoreUnused(dataSize);
dtTileCacheLayerHeader* header = (dtTileCacheLayerHeader*)data;
int swappedMagic = DT_TILECACHE_MAGIC;
int swappedVersion = DT_TILECACHE_VERSION;
dtSwapEndian(&swappedMagic);
dtSwapEndian(&swappedVersion);
if ((header->magic != DT_TILECACHE_MAGIC || header->version != DT_TILECACHE_VERSION) &&
(header->magic != swappedMagic || header->version != swappedVersion))
{
return false;
}
dtSwapEndian(&header->magic);
dtSwapEndian(&header->version);
dtSwapEndian(&header->tx);
dtSwapEndian(&header->ty);
dtSwapEndian(&header->tlayer);
dtSwapEndian(&header->bmin[0]);
dtSwapEndian(&header->bmin[1]);
dtSwapEndian(&header->bmin[2]);
dtSwapEndian(&header->bmax[0]);
dtSwapEndian(&header->bmax[1]);
dtSwapEndian(&header->bmax[2]);
dtSwapEndian(&header->hmin);
dtSwapEndian(&header->hmax);
// width, height, minx, maxx, miny, maxy are unsigned char, no need to swap.
return true;
}
/*
* Copyright (c) Facebook, Inc. and its affiliates. * All rights reserved.
*