--- /dev/null
+#include <cstdlib>
+
+#include "bitvector.h"
+
+
+namespace CSA
+{
+
+
+BitVector::BitVector(std::ifstream& file) :
+ rank_index(0), select_index(0)
+{
+ file.read((char*)&(this->size), sizeof(this->size));
+ file.read((char*)&(this->items), sizeof(this->items));
+ file.read((char*)&(this->number_of_blocks), sizeof(this->number_of_blocks));
+ file.read((char*)&(this->block_size), sizeof(this->block_size));
+
+ this->array = new usint[this->block_size * this->number_of_blocks];
+ file.read((char*)(this->array), this->block_size * this->number_of_blocks * sizeof(usint));
+ this->buffer = new FastBitBuffer(this->array, this->block_size);
+
+ this->integer_bits = length(this->size);
+ this->samples = new FastBitBuffer(file, 2 * (this->number_of_blocks + 1), this->integer_bits);
+
+ this->indexForRank();
+ this->indexForSelect();
+}
+
+BitVector::BitVector(VectorEncoder& encoder, usint universe_size) :
+ size(universe_size), items(encoder.items),
+ block_size(encoder.block_size),
+ number_of_blocks(encoder.blocks),
+ rank_index(0), select_index(0)
+{
+ this->array = new usint[this->block_size * this->number_of_blocks];
+ this->buffer = new FastBitBuffer(this->array, this->block_size);
+
+ this->integer_bits = length(this->size);
+ this->samples = new FastBitBuffer(2 * (this->number_of_blocks + 1), this->integer_bits);
+
+ // Copy & linearize the array.
+ usint pos = 0;
+ for(std::list<usint*>::iterator iter = encoder.array_blocks.begin(); iter != encoder.array_blocks.end(); iter++)
+ {
+ memcpy(this->array + pos, *iter, encoder.superblock_bytes);
+ pos += encoder.block_size * encoder.blocks_in_superblock;
+ }
+ memcpy(this->array + pos, encoder.array, encoder.current_blocks * encoder.block_size * sizeof(usint));
+
+ // Compress the samples.
+ for(std::list<usint*>::iterator iter = encoder.sample_blocks.begin(); iter != encoder.sample_blocks.end(); iter++)
+ {
+ usint* buf = *iter;
+ for(usint i = 0; i < 2 * encoder.samples_in_superblock; i++)
+ {
+ this->samples->writeItem(buf[i]);
+ }
+ }
+ for(usint i = 0; i < 2 * encoder.current_samples; i++)
+ {
+ this->samples->writeItem(encoder.samples[i]);
+ }
+ this->samples->writeItem(this->items);
+ this->samples->writeItem(this->size);
+
+ this->indexForRank();
+ this->indexForSelect();
+}
+
+BitVector::~BitVector()
+{
+ delete[] this->array;
+ delete this->buffer;
+ delete this->samples;
+ delete this->rank_index;
+ delete this->select_index;
+}
+
+void
+BitVector::writeTo(std::ofstream& file)
+{
+ file.write((char*)&(this->size), sizeof(this->size));
+ file.write((char*)&(this->items), sizeof(this->items));
+ file.write((char*)&(this->number_of_blocks), sizeof(this->number_of_blocks));
+ file.write((char*)&(this->block_size), sizeof(this->block_size));
+ file.write((char*)(this->array), this->block_size * this->number_of_blocks * sizeof(usint));
+ this->samples->writeBuffer(file, false);
+}
+
+//--------------------------------------------------------------------------
+
+usint
+BitVector::reportSize()
+{
+ usint bytes = this->buffer->reportSize();
+ bytes += this->block_size * this->number_of_blocks * sizeof(usint);
+ bytes += this->samples->reportSize();
+ bytes += this->rank_index->reportSize();
+ bytes += this->select_index->reportSize();
+ return bytes;
+}
+
+//--------------------------------------------------------------------------
+
+usint
+BitVector::sampleForIndex(usint index)
+{
+ usint low = this->select_index->readItem(index / this->select_rate);
+ usint high = this->select_index->readItem(index / this->select_rate + 1);
+
+ this->samples->goToItem(2 * low + 2);
+ for(; low < high; low++)
+ {
+ if(this->samples->readItem() > index) { return low; }
+ this->samples->skipItem();
+ }
+
+ return low;
+}
+
+usint
+BitVector::sampleForValue(usint value)
+{
+ usint low = this->rank_index->readItem(value / this->rank_rate);
+ usint high = this->rank_index->readItem(value / this->rank_rate + 1);
+
+ this->samples->goToItem(2 * low + 3);
+ for(; low < high; low++)
+ {
+ if(this->samples->readItem() > value) { return low; }
+ this->samples->skipItem();
+ }
+
+ return low;
+}
+
+//--------------------------------------------------------------------------
+
+void
+BitVector::indexForRank()
+{
+ delete this->rank_index;
+
+ usint value_samples = (this->number_of_blocks + BitVector::INDEX_RATE - 1) / BitVector::INDEX_RATE;
+ this->rank_rate = (this->size + value_samples - 1) / value_samples;
+ value_samples = (this->size + this->rank_rate - 1) / this->rank_rate + 1;
+ this->rank_index = new FastBitBuffer(value_samples, length(this->number_of_blocks - 1));
+
+ usint current = 0, pointer = 0;
+ this->samples->goToItem(2);
+ while(this->samples->hasNextItem())
+ {
+ this->samples->skipItem();
+ usint limit = this->samples->readItem();
+ while(current < limit)
+ {
+ this->rank_index->writeItem(pointer);
+ current += this->rank_rate;
+ }
+ pointer++;
+ }
+ this->rank_index->writeItem(this->number_of_blocks - 1);
+}
+
+void
+BitVector::indexForSelect()
+{
+ delete this->select_index;
+
+ usint index_samples = (this->number_of_blocks + BitVector::INDEX_RATE - 1) / BitVector::INDEX_RATE;
+ this->select_rate = (this->items + index_samples - 1) / index_samples;
+ index_samples = (this->items + this->select_rate - 1) / this->select_rate + 1;
+ this->select_index = new FastBitBuffer(index_samples, length(this->number_of_blocks - 1));
+
+ usint current = 0, pointer = 0;
+ this->samples->goToItem(2);
+ while(this->samples->hasNextItem())
+ {
+ usint limit = this->samples->readItem();
+ this->samples->skipItem();
+ while(current < limit)
+ {
+ this->select_index->writeItem(pointer);
+ current += this->select_rate;
+ }
+ pointer++;
+ }
+ this->select_index->writeItem(this->number_of_blocks - 1);
+}
+
+//--------------------------------------------------------------------------
+
+VectorEncoder::VectorEncoder(usint block_bytes, usint superblock_size) :
+ size(0), items(0), blocks(0),
+ block_size(BYTES_TO_WORDS(block_bytes)),
+ superblock_bytes(superblock_size)
+{
+ this->array = new usint[this->superblock_bytes / sizeof(usint)];
+ memset(this->array, 0, this->superblock_bytes);
+ this->blocks_in_superblock = this->superblock_bytes / (sizeof(usint) * this->block_size);
+ this->current_blocks = 0;
+
+ this->samples = new usint[this->superblock_bytes / sizeof(usint)];
+ this->samples_in_superblock = this->superblock_bytes / (2 * sizeof(usint));
+ this->current_samples = 0;
+
+ this->buffer = new FastBitBuffer(this->array, this->block_size);
+}
+
+VectorEncoder::~VectorEncoder()
+{
+ delete[] this->array;
+
+ delete this->buffer;
+ for(std::list<usint*>::iterator iter = this->array_blocks.begin(); iter != this->array_blocks.end(); iter++)
+ {
+ delete[] *iter;
+ }
+
+ delete[] this->samples;
+ for(std::list<usint*>::iterator iter = this->sample_blocks.begin(); iter != this->sample_blocks.end(); iter++)
+ {
+ delete[] *iter;
+ }
+}
+
+void
+VectorEncoder::addNewBlock()
+{
+ this->blocks++;
+ this->current_blocks++;
+ this->current_samples++;
+
+ // Do we need a new superblock for the block?
+ if(this->current_blocks > this->blocks_in_superblock)
+ {
+ this->array_blocks.push_back(this->array);
+ this->array = new usint[this->superblock_bytes / sizeof(usint)];
+ memset(this->array, 0, this->superblock_bytes);
+ this->current_blocks = 1;
+ }
+ this->buffer->moveBuffer(this->array + (this->block_size * (this->current_blocks - 1)));
+
+ // Do we need a new superblock for the sample?
+ if(this->current_samples > this->samples_in_superblock)
+ {
+ this->sample_blocks.push_back(this->samples);
+ this->samples = new usint[this->superblock_bytes / sizeof(usint)];
+ this->current_samples = 1;
+ }
+ this->samples[2 * this->current_samples - 2] = this->items - 1;
+ this->samples[2 * this->current_samples - 1] = this->size - 1;
+}
+
+void
+VectorEncoder::setFirstBit(usint value)
+{
+ this->samples[0] = 0;
+ this->samples[1] = value;
+
+ this->size = value + 1;
+ this->items = 1;
+ this->blocks = 1;
+
+ this->current_blocks = 1;
+ this->current_samples = 1;
+}
+
+
+} // namespace CSA
projects / SXSI / TextCollection.git / blobdiff