void LogSequence2::load(std::istream & input)
{
CRC8 crch;
CRC32 crcd;
unsigned char buf[9];
// Read type
uint8_t type;
crch.readData(input, (unsigned char*)&type, sizeof(type));
if(type!=TYPE_SEQLOG) {
//throw "Trying to read a LOGArray but data is not LogArray";
}
// Read numbits
crch.readData(input, (unsigned char*)&numbits, sizeof(numbits));
// Read numentries
uint64_t numentries64 = csd::VByte::decode(input);
unsigned int pos = csd::VByte::encode(buf, numentries64);
crch.update(buf, pos);
// Validate Checksum Header
crc8_t filecrch = crc8_read(input);
if(crch.getValue()!=filecrch) {
throw "Checksum error while reading LogSequence2 header.";
}
// Update local variables and validate
maxval = maxVal(numbits);
numentries = (size_t) numentries64;
if(numbits>sizeof(size_t)*8 || numentries64>std::numeric_limits<size_t>::max()) {
throw "This data structure is too big for this machine";
}
// Calculate data size, reserve buffer.
size_t numbytes = numBytesFor(numbits, numentries);
data.resize(numElementsFor(numbits, numentries));
arraysize = data.size();
array = &data[0];
// Read data
crcd.readData(input, (unsigned char*)&array[0], numbytes);
// Validate checksum data
crc32_t filecrcd = crc32_read(input);
if(crcd.getValue()!=filecrcd) {
throw "Checksum error while reading LogSequence2 Data";
}
IsMapped = false;
}
CSD* CSD_PFC::load(istream & fp)
{
CRC8 crch;
CRC32 crcd;
unsigned char buf[27]; // 9 bytes per VByte (max) * 3 values.
CSD_PFC *dicc = new CSD_PFC();
// Load variables
dicc->type = PFC; // Type already read by CSD
dicc->numstrings = (uint32_t) VByte::decode(fp);
dicc->bytes = VByte::decode(fp);
dicc->blocksize = (uint32_t) VByte::decode(fp);
// Calculate variables CRC
crch.update(&dicc->type, sizeof(dicc->type));
uint8_t pos = 0;
pos += VByte::encode(&buf[pos], dicc->numstrings);
pos += VByte::encode(&buf[pos], dicc->bytes);
pos += VByte::encode(&buf[pos], dicc->blocksize);
crch.update(buf, pos);
crc8_t filecrc = crc8_read(fp);
if(crch.getValue()!=filecrc) {
throw std::runtime_error("Checksum error while reading Plain Front Coding Header.");
}
// Load blocks
dicc->blocks = new hdt::LogSequence2();
dicc->blocks->load(fp);
dicc->nblocks = dicc->blocks->getNumberOfElements()-1;
// Load strings
if(dicc->bytes && dicc->numstrings) {
dicc->text = (unsigned char *)malloc(dicc->bytes);
const unsigned int blocksize = 8192;
uint64_t counter=0;
unsigned char *ptr = (unsigned char *)dicc->text;
while(counter<dicc->bytes && fp.good()) {
crcd.readData(fp, ptr, dicc->bytes-counter > blocksize ? blocksize : dicc->bytes-counter);
ptr += fp.gcount();
counter += fp.gcount();
}
if(counter!=dicc->bytes) {
throw std::runtime_error("Could not read all the data section of the Plain Front Coding.");
}
} else {
// Make sure that all is zero.
dicc->text = NULL;
dicc->numstrings = 0;
dicc->bytes = 0;
dicc->nblocks = 0;
delete dicc->blocks;
}
crc32_t filecrcd = crc32_read(fp);
if(filecrcd!=crcd.getValue()) {
throw std::runtime_error("Checksum error in the data section of the Plain Front Coding.");
}
return dicc;
}