// Interleave "bits" with corresponding error correction bytes. On success, store the result in
// "result" and return true. The interleave rule is complicated. See 8.6
// of JISX0510:2004 (p.37) for details.
static void interleaveWithECBytes(BitVector bits, int numTotalBytes,
int numDataBytes, int numRSBlocks, BitVector result)
{
// "bits" must have "getNumDataBytes" bytes of data.
if (bits.sizeInBytes() != numDataBytes)
{
throw new WriterException("Number of bits and data bytes does not match");
}
// Step 1. Divide data bytes into blocks and generate error correction bytes for them. We'll
// store the divided data bytes blocks and error correction bytes blocks into "blocks".
int dataBytesOffset = 0;
int maxNumDataBytes = 0;
int maxNumEcBytes = 0;
// Since, we know the number of reedsolmon blocks, we can initialize the vector with the number.
ArrayList blocks = new ArrayList(numRSBlocks);
for (int i = 0; i < numRSBlocks; ++i)
{
int[] numDataBytesInBlock = new int[1];
int[] numEcBytesInBlock = new int[1];
getNumDataBytesAndNumECBytesForBlockID(
numTotalBytes, numDataBytes, numRSBlocks, i,
numDataBytesInBlock, numEcBytesInBlock);
ByteArray dataBytes = new ByteArray();
dataBytes.set(bits.getArray(), dataBytesOffset, numDataBytesInBlock[0]);
ByteArray ecBytes = generateECBytes(dataBytes, numEcBytesInBlock[0]);
blocks.Add(new BlockPair(dataBytes, ecBytes));
maxNumDataBytes = Math.Max(maxNumDataBytes, dataBytes.size());
maxNumEcBytes = Math.Max(maxNumEcBytes, ecBytes.size());
dataBytesOffset += numDataBytesInBlock[0];
}
if (numDataBytes != dataBytesOffset)
{
throw new WriterException("Data bytes does not match offset");
}
// First, place data blocks.
for (int i = 0; i < maxNumDataBytes; ++i)
{
for (int j = 0; j < blocks.Count; ++j)
{
ByteArray dataBytes = ((BlockPair)blocks[j]).getDataBytes();
if (i < dataBytes.size())
{
result.appendBits(dataBytes.at(i), 8);
}
}
}
// Then, place error correction blocks.
for (int i = 0; i < maxNumEcBytes; ++i)
{
for (int j = 0; j < blocks.Count; ++j)
{
ByteArray ecBytes = ((BlockPair)blocks[j]).getErrorCorrectionBytes();
if (i < ecBytes.size())
{
result.appendBits(ecBytes.at(i), 8);
}
}
}
if (numTotalBytes != result.sizeInBytes()) // Should be same.
{
throw new WriterException("Interleaving error: " + numTotalBytes + " and " + result.sizeInBytes() +
" differ.");
}
}
// Interleave "bits" with corresponding error correction bytes. On success, store the result in
// "result" and return true. The interleave rule is complicated. See 8.6
// of JISX0510:2004 (p.37) for details.
static void interleaveWithECBytes(BitVector bits, int numTotalBytes,
int numDataBytes, int numRSBlocks, BitVector result)
{
// "bits" must have "getNumDataBytes" bytes of data.
if (bits.sizeInBytes() != numDataBytes) {
throw new WriterException("Number of bits and data bytes does not match");
}
// Step 1. Divide data bytes into blocks and generate error correction bytes for them. We'll
// store the divided data bytes blocks and error correction bytes blocks into "blocks".
int dataBytesOffset = 0;
int maxNumDataBytes = 0;
int maxNumEcBytes = 0;
// Since, we know the number of reedsolmon blocks, we can initialize the vector with the number.
ArrayList blocks = new ArrayList(numRSBlocks);
for (int i = 0; i < numRSBlocks; ++i) {
int[] numDataBytesInBlock = new int[1];
int[] numEcBytesInBlock = new int[1];
getNumDataBytesAndNumECBytesForBlockID(
numTotalBytes, numDataBytes, numRSBlocks, i,
numDataBytesInBlock, numEcBytesInBlock);
ByteArray dataBytes = new ByteArray();
dataBytes.set(bits.getArray(), dataBytesOffset, numDataBytesInBlock[0]);
ByteArray ecBytes = generateECBytes(dataBytes, numEcBytesInBlock[0]);
blocks.Add(new BlockPair(dataBytes, ecBytes));
maxNumDataBytes = Math.Max(maxNumDataBytes, dataBytes.size());
maxNumEcBytes = Math.Max(maxNumEcBytes, ecBytes.size());
dataBytesOffset += numDataBytesInBlock[0];
}
if (numDataBytes != dataBytesOffset) {
throw new WriterException("Data bytes does not match offset");
}
// First, place data blocks.
for (int i = 0; i < maxNumDataBytes; ++i) {
for (int j = 0; j < blocks.Count; ++j) {
ByteArray dataBytes = ((BlockPair) blocks[j]).getDataBytes();
if (i < dataBytes.size()) {
result.appendBits(dataBytes.at(i), 8);
}
}
}
// Then, place error correction blocks.
for (int i = 0; i < maxNumEcBytes; ++i) {
for (int j = 0; j < blocks.Count; ++j) {
ByteArray ecBytes = ((BlockPair) blocks[j]).getErrorCorrectionBytes();
if (i < ecBytes.size()) {
result.appendBits(ecBytes.at(i), 8);
}
}
}
if (numTotalBytes != result.sizeInBytes()) { // Should be same.
throw new WriterException("Interleaving error: " + numTotalBytes + " and " + result.sizeInBytes() +
" differ.");
}
}
