ipsw/hack/extras/Bom.bt

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typedef struct 
{
  char magic[8];            // Always "BOMStore"
  uint version;         // Always 1
  uint numberOfBlocks;  // Number of non-null entries in BOMBlockTable
  uint indexOffset;     // Offset to index table
  uint indexLength;     // Length of index table, indexOffset + indexLength = file_length
  uint varsOffset;
  uint varsLength;
} BOMHeader;

typedef struct 
{
  uint address;
  uint length;
} BOMPointer;

typedef struct
{
  uint numberOfBlockTablePointers;  // Not all of them will be occupied. See header for number of non-null blocks
  BOMPointer blockPointers[numberOfBlockTablePointers]; // First entry must always be a null entry
} BOMBlockTable;

BigEndian();

BOMHeader header;
FSeek(header.indexOffset);
BOMBlockTable indexHeader;