static boolean rFind(struct bptFile *bpt, bits64 blockStart, void *key, void *val)
/* Find value corresponding to key. If found copy value to memory pointed to by val and return
* true. Otherwise return false. */
{
/* Seek to start of block. */
udcSeek(bpt->udc, blockStart);
/* Read block header. */
UBYTE isLeaf;
UBYTE reserved;
bits16 i, childCount;
udcMustReadOne(bpt->udc, isLeaf);
udcMustReadOne(bpt->udc, reserved);
boolean isSwapped = bpt->isSwapped;
childCount = udcReadBits16(bpt->udc, isSwapped);
UBYTE keyBuf[bpt->keySize]; /* Place to put a key, buffered on stack. */
if (isLeaf)
{
for (i=0; i<childCount; ++i)
{
udcMustRead(bpt->udc, keyBuf, bpt->keySize);
udcMustRead(bpt->udc, val, bpt->valSize);
if (memcmp(key, keyBuf, bpt->keySize) == 0)
return TRUE;
}
return FALSE;
}
else
{
/* Read and discard first key. */
udcMustRead(bpt->udc, keyBuf, bpt->keySize);
/* Scan info for first file offset. */
bits64 fileOffset = udcReadBits64(bpt->udc, isSwapped);
/* Loop through remainder. */
for (i=1; i<childCount; ++i)
{
udcMustRead(bpt->udc, keyBuf, bpt->keySize);
if (memcmp(key, keyBuf, bpt->keySize) < 0)
break;
fileOffset = udcReadBits64(bpt->udc, isSwapped);
}
return rFind(bpt, fileOffset, key, val);
}
}
static bits64 bptDataStart(struct bptFile *bpt)
/* Return offset of first bit of data (as opposed to index) in file. In hind sight I wish
* this were stored in the header, but fortunately it's not that hard to compute. */
{
bits64 offset = bpt->rootOffset;
for (;;)
{
/* Seek to block start */
udcSeek(bpt->udc, offset);
/* Read block header, break if we are leaf. */
UBYTE isLeaf;
UBYTE reserved;
bits16 childCount;
udcMustReadOne(bpt->udc, isLeaf);
if (isLeaf)
break;
udcMustReadOne(bpt->udc, reserved);
boolean isSwapped = bpt->isSwapped;
childCount = udcReadBits16(bpt->udc, isSwapped);
/* Read and discard first key. */
char keyBuf[bpt->keySize];
udcMustRead(bpt->udc, keyBuf, bpt->keySize);
/* Get file offset of sub-block. */
offset = udcReadBits64(bpt->udc, isSwapped);
}
return offset;
}
enum metaBigFileType isBigWigOrBed(char* filename)
/* Peak at a file to see if it's bigWig */
{
enum metaBigFileType ret = isNotBig;
bits32 magic;
struct udcFile* udc;
udc = udcFileOpen(filename, udcDefaultDir());
/* Read magic number at head of file and use it to see if we are proper file type, and
* see if we are byte-swapped. */
udcMustRead(udc, &magic, sizeof(magic));
if (magic == bigWigSig)
ret = isaBigWig;
else if (magic == bigBedSig)
ret = isaBigBed;
if (ret != isNotBig) {
udcFileClose(&udc);
return ret;
}
magic = byteSwap32(magic);
if (magic == bigWigSig)
ret = isaBigWig;
else if (magic == bigBedSig)
ret = isaBigBed;
udcFileClose(&udc);
return ret;
}
void bptKeyAtPos(struct bptFile *bpt, bits64 itemPos, void *result)
/* Fill in result with the key at given itemPos. For first piece of data itemPos is 0
* Result must be at least bpt->keySize. If result is a string it won't be zero terminated
* by this routine. Use bptStringKeyAtPos instead. */
{
bits64 offset = bptDataOffset(bpt, itemPos);
udcSeek(bpt->udc, offset);
udcMustRead(bpt->udc, result, bpt->keySize);
}
static void rTraverse(struct bptFile *bpt, bits64 blockStart, void *context,
void (*callback)(void *context, void *key, int keySize, void *val, int valSize) )
/* Recursively go across tree, calling callback at leaves. */
{
/* Seek to start of block. */
udcSeek(bpt->udc, blockStart);
/* Read block header. */
UBYTE isLeaf;
UBYTE reserved;
bits16 i, childCount;
udcMustReadOne(bpt->udc, isLeaf);
udcMustReadOne(bpt->udc, reserved);
boolean isSwapped = bpt->isSwapped;
childCount = udcReadBits16(bpt->udc, isSwapped);
char keyBuf[bpt->keySize], valBuf[bpt->valSize];
if (isLeaf)
{
for (i=0; i<childCount; ++i)
{
udcMustRead(bpt->udc, keyBuf, bpt->keySize);
udcMustRead(bpt->udc, valBuf, bpt->valSize);
callback(context, keyBuf, bpt->keySize, valBuf, bpt->valSize);
}
}
else
{
bits64 fileOffsets[childCount];
/* Loop through to get file offsets of children. */
for (i=0; i<childCount; ++i)
{
udcMustRead(bpt->udc, keyBuf, bpt->keySize);
fileOffsets[i] = udcReadBits64(bpt->udc, isSwapped);
}
/* Loop through recursing on child offsets. */
for (i=0; i<childCount; ++i)
rTraverse(bpt, fileOffsets[i], context, callback);
}
}
static bool downloadBlockRun(BigFileReaderData * data, char * chrom, struct fileOffsetSize * firstBlock, struct fileOffsetSize * afterBlock, bits64 mergedSize) {
char * mergedBuf, *blockBuf;
struct fileOffsetSize * block;
udcSeek(data->udc, firstBlock->offset);
blockBuf = mergedBuf = (char *) needLargeMem(mergedSize);
udcMustRead(data->udc, mergedBuf, mergedSize);
for (block = firstBlock; block != afterBlock; block = block->next) {
if (openBlock(data, block, blockBuf)) {
freeMem(mergedBuf);
return true;
}
blockBuf += block->size;
}
freeMem(mergedBuf);
return false;
}
static void rFindMulti(struct bptFile *bpt, bits64 blockStart, void *key, struct slRef **pList)
/* Find values corresponding to key and add them to pList. You'll need to
* Do a slRefFreeListAndVals() on the list when done. */
{
/* Seek to start of block. */
udcSeek(bpt->udc, blockStart);
/* Read block header. */
UBYTE isLeaf;
UBYTE reserved;
bits16 i, childCount;
udcMustReadOne(bpt->udc, isLeaf);
udcMustReadOne(bpt->udc, reserved);
boolean isSwapped = bpt->isSwapped;
childCount = udcReadBits16(bpt->udc, isSwapped);
int keySize = bpt->keySize;
UBYTE keyBuf[keySize]; /* Place to put a key, buffered on stack. */
UBYTE valBuf[bpt->valSize]; /* Place to put a value, buffered on stack. */
if (isLeaf)
{
for (i=0; i<childCount; ++i)
{
udcMustRead(bpt->udc, keyBuf, keySize);
udcMustRead(bpt->udc, valBuf, bpt->valSize);
if (memcmp(key, keyBuf, keySize) == 0)
{
void *val = cloneMem(valBuf, bpt->valSize);
refAdd(pList, val);
}
}
}
else
{
/* Read first key and first file offset. */
udcMustRead(bpt->udc, keyBuf, keySize);
bits64 lastFileOffset = udcReadBits64(bpt->udc, isSwapped);
bits64 fileOffset = lastFileOffset;
int lastCmp = memcmp(key, keyBuf, keySize);
/* Loop through remainder. */
for (i=1; i<childCount; ++i)
{
udcMustRead(bpt->udc, keyBuf, keySize);
fileOffset = udcReadBits64(bpt->udc, isSwapped);
int cmp = memcmp(key, keyBuf, keySize);
if (lastCmp >= 0 && cmp <= 0)
{
bits64 curPos = udcTell(bpt->udc);
rFindMulti(bpt, lastFileOffset, key, pList);
udcSeek(bpt->udc, curPos);
}
if (cmp < 0)
return;
lastCmp = cmp;
lastFileOffset = fileOffset;
}
/* If made it all the way to end, do last one too. */
rFindMulti(bpt, fileOffset, key, pList);
}
}
int bigWigIntervalDump(struct bbiFile *bwf, char *chrom, bits32 start, bits32 end, int maxCount,
FILE *out)
/* Print out info on bigWig parts that intersect chrom:start-end. Set maxCount to 0 if you
* don't care how many are printed. Returns number printed. */
{
if (bwf->typeSig != bigWigSig)
errAbort("Trying to do bigWigIntervalDump on a non big-wig file.");
bbiAttachUnzoomedCir(bwf);
struct fileOffsetSize *blockList = bbiOverlappingBlocks(bwf, bwf->unzoomedCir,
chrom, start, end, NULL);
struct fileOffsetSize *block, *beforeGap, *afterGap;
struct udcFile *udc = bwf->udc;
int printCount = 0;
/* Set up for uncompression optionally. */
char *uncompressBuf = NULL;
if (bwf->uncompressBufSize > 0)
uncompressBuf = needLargeMem(bwf->uncompressBufSize);
/* This loop is a little complicated because we merge the read requests for efficiency, but we
* have to then go back through the data one unmerged block at a time. */
for (block = blockList; block != NULL; )
{
/* Find contigious blocks and read them into mergedBuf. */
fileOffsetSizeFindGap(block, &beforeGap, &afterGap);
bits64 mergedOffset = block->offset;
bits64 mergedSize = beforeGap->offset + beforeGap->size - mergedOffset;
udcSeek(udc, mergedOffset);
char *mergedBuf = needLargeMem(mergedSize);
udcMustRead(udc, mergedBuf, mergedSize);
char *blockBuf = mergedBuf;
/* Loop through individual blocks within merged section. */
for (;block != afterGap; block = block->next)
{
/* Uncompress if necessary. */
char *blockPt, *blockEnd;
if (uncompressBuf)
{
blockPt = uncompressBuf;
int uncSize = zUncompress(blockBuf, block->size, uncompressBuf, bwf->uncompressBufSize);
blockEnd = blockPt + uncSize;
}
else
{
blockPt = blockBuf;
blockEnd = blockPt + block->size;
}
/* Do the actual dump. */
int oneCount = bigWigBlockDumpIntersectingRange(bwf->isSwapped, blockPt, blockEnd,
chrom, start, end, maxCount, out);
/* Keep track of how many dumped, not exceeding maximum. */
printCount += oneCount;
if (maxCount != 0)
{
if (oneCount >= maxCount)
break;
maxCount -= oneCount;
}
blockBuf += block->size;
}
freeMem(mergedBuf);
}
freeMem(uncompressBuf);
slFreeList(&blockList);
return printCount;
}
struct bbiInterval *bigWigIntervalQuery(struct bbiFile *bwf, char *chrom, bits32 start, bits32 end,
struct lm *lm)
/* Get data for interval. Return list allocated out of lm. */
{
if (bwf->typeSig != bigWigSig)
errAbort("Trying to do bigWigIntervalQuery on a non big-wig file.");
bbiAttachUnzoomedCir(bwf);
struct bbiInterval *el, *list = NULL;
struct fileOffsetSize *blockList = bbiOverlappingBlocks(bwf, bwf->unzoomedCir,
chrom, start, end, NULL);
struct fileOffsetSize *block, *beforeGap, *afterGap;
struct udcFile *udc = bwf->udc;
boolean isSwapped = bwf->isSwapped;
float val;
int i;
/* Set up for uncompression optionally. */
char *uncompressBuf = NULL;
if (bwf->uncompressBufSize > 0)
uncompressBuf = needLargeMem(bwf->uncompressBufSize);
/* This loop is a little complicated because we merge the read requests for efficiency, but we
* have to then go back through the data one unmerged block at a time. */
for (block = blockList; block != NULL; )
{
/* Find contigious blocks and read them into mergedBuf. */
fileOffsetSizeFindGap(block, &beforeGap, &afterGap);
bits64 mergedOffset = block->offset;
bits64 mergedSize = beforeGap->offset + beforeGap->size - mergedOffset;
udcSeek(udc, mergedOffset);
char *mergedBuf = needLargeMem(mergedSize);
udcMustRead(udc, mergedBuf, mergedSize);
char *blockBuf = mergedBuf;
/* Loop through individual blocks within merged section. */
for (;block != afterGap; block = block->next)
{
/* Uncompress if necessary. */
char *blockPt, *blockEnd;
if (uncompressBuf)
{
blockPt = uncompressBuf;
int uncSize = zUncompress(blockBuf, block->size, uncompressBuf, bwf->uncompressBufSize);
blockEnd = blockPt + uncSize;
}
else
{
blockPt = blockBuf;
blockEnd = blockPt + block->size;
}
/* Deal with insides of block. */
struct bwgSectionHead head;
bwgSectionHeadFromMem(&blockPt, &head, isSwapped);
switch (head.type)
{
case bwgTypeBedGraph:
{
for (i=0; i<head.itemCount; ++i)
{
bits32 s = memReadBits32(&blockPt, isSwapped);
bits32 e = memReadBits32(&blockPt, isSwapped);
val = memReadFloat(&blockPt, isSwapped);
if (s < start) s = start;
if (e > end) e = end;
if (s < e)
{
lmAllocVar(lm, el);
el->start = s;
el->end = e;
el->val = val;
slAddHead(&list, el);
}
}
break;
}
case bwgTypeVariableStep:
{
for (i=0; i<head.itemCount; ++i)
{
bits32 s = memReadBits32(&blockPt, isSwapped);
bits32 e = s + head.itemSpan;
val = memReadFloat(&blockPt, isSwapped);
if (s < start) s = start;
if (e > end) e = end;
if (s < e)
{
lmAllocVar(lm, el);
el->start = s;
el->end = e;
el->val = val;
slAddHead(&list, el);
}
}
break;
}
case bwgTypeFixedStep:
{
bits32 s = head.start;
bits32 e = s + head.itemSpan;
for (i=0; i<head.itemCount; ++i)
{
val = memReadFloat(&blockPt, isSwapped);
bits32 clippedS = s, clippedE = e;
if (clippedS < start) clippedS = start;
if (clippedE > end) clippedE = end;
if (clippedS < clippedE)
{
lmAllocVar(lm, el);
el->start = clippedS;
el->end = clippedE;
el->val = val;
slAddHead(&list, el);
}
s += head.itemStep;
e += head.itemStep;
}
break;
}
default:
internalErr();
break;
}
assert(blockPt == blockEnd);
blockBuf += block->size;
}
freeMem(mergedBuf);
}
freeMem(uncompressBuf);
slFreeList(&blockList);
slReverse(&list);
return list;
}
static void fetchIntoBuf(struct bbiFile *bwf, char *chrom, bits32 start, bits32 end,
struct bigWigValsOnChrom *chromVals)
/* Get data for interval. Return list allocated out of lm. */
{
/* A lot of code duplicated with bigWigIntervalQuery, but here the clipping
* is simplified since always working across full chromosome, and the output is
* different. Since both of these are in inner loops and speed critical, it's hard
* to factor out without perhaps making it worse than the bit of duplication. */
if (bwf->typeSig != bigWigSig)
errAbort("Trying to do fetchIntoBuf on a non big-wig file.");
bbiAttachUnzoomedCir(bwf);
struct fileOffsetSize *blockList = bbiOverlappingBlocks(bwf, bwf->unzoomedCir,
chrom, start, end, NULL);
struct fileOffsetSize *block, *beforeGap, *afterGap;
struct udcFile *udc = bwf->udc;
boolean isSwapped = bwf->isSwapped;
float val;
int i;
Bits *covBuf = chromVals->covBuf;
double *valBuf = chromVals->valBuf;
/* Set up for uncompression optionally. */
char *uncompressBuf = NULL;
if (bwf->uncompressBufSize > 0)
uncompressBuf = needLargeMem(bwf->uncompressBufSize);
/* This loop is a little complicated because we merge the read requests for efficiency, but we
* have to then go back through the data one unmerged block at a time. */
for (block = blockList; block != NULL; )
{
/* Find contigious blocks and read them into mergedBuf. */
fileOffsetSizeFindGap(block, &beforeGap, &afterGap);
bits64 mergedOffset = block->offset;
bits64 mergedSize = beforeGap->offset + beforeGap->size - mergedOffset;
udcSeek(udc, mergedOffset);
char *mergedBuf = needLargeMem(mergedSize);
udcMustRead(udc, mergedBuf, mergedSize);
char *blockBuf = mergedBuf;
/* Loop through individual blocks within merged section. */
for (;block != afterGap; block = block->next)
{
/* Uncompress if necessary. */
char *blockPt, *blockEnd;
if (uncompressBuf)
{
blockPt = uncompressBuf;
int uncSize = zUncompress(blockBuf, block->size, uncompressBuf, bwf->uncompressBufSize);
blockEnd = blockPt + uncSize;
}
else
{
blockPt = blockBuf;
blockEnd = blockPt + block->size;
}
/* Deal with insides of block. */
struct bwgSectionHead head;
bwgSectionHeadFromMem(&blockPt, &head, isSwapped);
switch (head.type)
{
case bwgTypeBedGraph:
{
for (i=0; i<head.itemCount; ++i)
{
bits32 s = memReadBits32(&blockPt, isSwapped);
bits32 e = memReadBits32(&blockPt, isSwapped);
bitSetRange(covBuf, s, e-s);
val = memReadFloat(&blockPt, isSwapped);
bits32 j;
for (j=s; j<e; ++j)
valBuf[j] = val;
}
break;
}
case bwgTypeVariableStep:
{
for (i=0; i<head.itemCount; ++i)
{
bits32 s = memReadBits32(&blockPt, isSwapped);
val = memReadFloat(&blockPt, isSwapped);
bitSetRange(covBuf, s, head.itemSpan);
bits32 e = s + head.itemSpan;
bits32 j;
for (j=s; j<e; ++j)
valBuf[j] = val;
}
break;
}
case bwgTypeFixedStep:
{
/* Do a little optimization for the most common and worst case - step1/span1 */
if (head.itemStep == 1 && head.itemSpan == 1)
{
bits32 s = head.start;
bits32 e = head.end;
bitSetRange(covBuf, s, e-s);
bits32 j;
for (j=s; j<e; ++j)
valBuf[j] = memReadFloat(&blockPt, isSwapped);
}
else
{
bits32 s = head.start;
bits32 e = s + head.itemSpan;
for (i=0; i<head.itemCount; ++i)
{
bitSetRange(covBuf, s, head.itemSpan);
val = memReadFloat(&blockPt, isSwapped);
bits32 j;
for (j=s; j<e; ++j)
valBuf[j] = val;
s += head.itemStep;
e += head.itemStep;
}
}
break;
}
default:
internalErr();
break;
}
assert(blockPt == blockEnd);
blockBuf += block->size;
}
freeMem(mergedBuf);
}
freeMem(uncompressBuf);
slFreeList(&blockList);
}
struct bbiFile *bbiFileOpenWithDir(char *fileName, bits32 sig, char *typeName, char *udcDir)
/* same (mostly) as bbiFileOpen in bbiFile.c, but allows setting the temporary dir */
{
struct bbiFile *bbi;
AllocVar(bbi);
bbi->fileName = cloneString(fileName);
struct udcFile *udc = bbi->udc = udcFileOpen(fileName, udcDir);
/* Read magic number at head of file and use it to see if we are proper file type, and
* see if we are byte-swapped. */
bits32 magic;
boolean isSwapped = FALSE;
udcMustRead(udc, &magic, sizeof(magic));
if (magic != sig)
{
magic = byteSwap32(magic);
isSwapped = TRUE;
if (magic != sig)
errAbort("%s is not a %s file", fileName, typeName);
}
bbi->typeSig = sig;
bbi->isSwapped = isSwapped;
/* Read rest of defined bits of header, byte swapping as needed. */
bbi->version = udcReadBits16(udc, isSwapped);
bbi->zoomLevels = udcReadBits16(udc, isSwapped);
bbi->chromTreeOffset = udcReadBits64(udc, isSwapped);
bbi->unzoomedDataOffset = udcReadBits64(udc, isSwapped);
bbi->unzoomedIndexOffset = udcReadBits64(udc, isSwapped);
bbi->fieldCount = udcReadBits16(udc, isSwapped);
bbi->definedFieldCount = udcReadBits16(udc, isSwapped);
bbi->asOffset = udcReadBits64(udc, isSwapped);
bbi->totalSummaryOffset = udcReadBits64(udc, isSwapped);
bbi->uncompressBufSize = udcReadBits32(udc, isSwapped);
bbi->extensionOffset = udcReadBits64(udc, isSwapped);
/* Read zoom headers. */
int i;
struct bbiZoomLevel *level, *levelList = NULL;
for (i=0; i<bbi->zoomLevels; ++i)
{
AllocVar(level);
level->reductionLevel = udcReadBits32(udc, isSwapped);
level->reserved = udcReadBits32(udc, isSwapped);
level->dataOffset = udcReadBits64(udc, isSwapped);
level->indexOffset = udcReadBits64(udc, isSwapped);
slAddHead(&levelList, level);
}
slReverse(&levelList);
bbi->levelList = levelList;
/* Deal with header extension if any. */
if (bbi->extensionOffset != 0)
{
udcSeek(udc, bbi->extensionOffset);
bbi->extensionSize = udcReadBits16(udc, isSwapped);
bbi->extraIndexCount = udcReadBits16(udc, isSwapped);
bbi->extraIndexListOffset = udcReadBits64(udc, isSwapped);
}
/* Attach B+ tree of chromosome names and ids. */
udcSeek(udc, bbi->chromTreeOffset);
bbi->chromBpt = bptFileAttach(fileName, udc);
return bbi;
}
struct bigBedInterval *bigBedIntervalQuery(struct bbiFile *bbi, char *chrom,
bits32 start, bits32 end, int maxItems, struct lm *lm)
/* Get data for interval. Return list allocated out of lm. Set maxItems to maximum
* number of items to return, or to 0 for all items. */
{
struct bigBedInterval *el, *list = NULL;
int itemCount = 0;
bbiAttachUnzoomedCir(bbi);
bits32 chromId;
struct fileOffsetSize *blockList = bbiOverlappingBlocks(bbi, bbi->unzoomedCir,
chrom, start, end, &chromId);
struct fileOffsetSize *block, *beforeGap, *afterGap;
struct udcFile *udc = bbi->udc;
boolean isSwapped = bbi->isSwapped;
struct dyString *dy = dyStringNew(32);
/* Set up for uncompression optionally. */
char *uncompressBuf = NULL;
if (bbi->uncompressBufSize > 0)
uncompressBuf = needLargeMem(bbi->uncompressBufSize);
for (block = blockList; block != NULL; )
{
/* Find contigious blocks and read them into mergedBuf. */
fileOffsetSizeFindGap(block, &beforeGap, &afterGap);
bits64 mergedOffset = block->offset;
bits64 mergedSize = beforeGap->offset + beforeGap->size - mergedOffset;
udcSeek(udc, mergedOffset);
char *mergedBuf = needLargeMem(mergedSize);
udcMustRead(udc, mergedBuf, mergedSize);
char *blockBuf = mergedBuf;
/* Loop through individual blocks within merged section. */
for (;block != afterGap; block = block->next)
{
/* Uncompress if necessary. */
char *blockPt, *blockEnd;
if (uncompressBuf)
{
blockPt = uncompressBuf;
int uncSize = zUncompress(blockBuf, block->size, uncompressBuf, bbi->uncompressBufSize);
blockEnd = blockPt + uncSize;
}
else
{
blockPt = blockBuf;
blockEnd = blockPt + block->size;
}
while (blockPt < blockEnd)
{
/* Read next record into local variables. */
bits32 chr = memReadBits32(&blockPt, isSwapped); // Read and discard chromId
bits32 s = memReadBits32(&blockPt, isSwapped);
bits32 e = memReadBits32(&blockPt, isSwapped);
int c;
dyStringClear(dy);
// TODO - can simplify this probably just to for (;;) {if ((c = *blockPt++) == 0) ...
while ((c = *blockPt++) >= 0)
{
if (c == 0)
break;
dyStringAppendC(dy, c);
}
/* If we're actually in range then copy it into a new element and add to list. */
if (chr == chromId && s < end && e > start)
{
++itemCount;
if (maxItems > 0 && itemCount > maxItems)
break;
lmAllocVar(lm, el);
el->start = s;
el->end = e;
if (dy->stringSize > 0)
el->rest = lmCloneString(lm, dy->string);
el->chromId = chromId;
slAddHead(&list, el);
}
}
if (maxItems > 0 && itemCount > maxItems)
break;
blockBuf += block->size;
}
if (maxItems > 0 && itemCount > maxItems)
break;
freez(&mergedBuf);
}
freeMem(uncompressBuf);
dyStringFree(&dy);
slFreeList(&blockList);
slReverse(&list);
return list;
}
struct bbiFile *bbiFileOpen(char *fileName, bits32 sig, char *typeName)
/* Open up big wig or big bed file. */
{
/* This code needs to agree with code in two other places currently - bigBedFileCreate,
* and bigWigFileCreate. I'm thinking of refactoring to share at least between
* bigBedFileCreate and bigWigFileCreate. It'd be great so it could be structured
* so that it could send the input in one chromosome at a time, and send in the zoom
* stuff only after all the chromosomes are done. This'd potentially reduce the memory
* footprint by a factor of 2 or 4. Still, for now it works. -JK */
struct bbiFile *bbi;
AllocVar(bbi);
bbi->fileName = cloneString(fileName);
struct udcFile *udc = bbi->udc = udcFileOpen(fileName, udcDefaultDir());
/* Read magic number at head of file and use it to see if we are proper file type, and
* see if we are byte-swapped. */
bits32 magic;
boolean isSwapped = FALSE;
udcMustRead(udc, &magic, sizeof(magic));
if (magic != sig)
{
magic = byteSwap32(magic);
isSwapped = TRUE;
if (magic != sig)
errAbort("%s is not a %s file", fileName, typeName);
}
bbi->typeSig = sig;
bbi->isSwapped = isSwapped;
/* Read rest of defined bits of header, byte swapping as needed. */
bbi->version = udcReadBits16(udc, isSwapped);
bbi->zoomLevels = udcReadBits16(udc, isSwapped);
bbi->chromTreeOffset = udcReadBits64(udc, isSwapped);
bbi->unzoomedDataOffset = udcReadBits64(udc, isSwapped);
bbi->unzoomedIndexOffset = udcReadBits64(udc, isSwapped);
bbi->fieldCount = udcReadBits16(udc, isSwapped);
bbi->definedFieldCount = udcReadBits16(udc, isSwapped);
bbi->asOffset = udcReadBits64(udc, isSwapped);
bbi->totalSummaryOffset = udcReadBits64(udc, isSwapped);
bbi->uncompressBufSize = udcReadBits32(udc, isSwapped);
/* Skip over reserved area. */
udcSeek(udc, 64);
/* Read zoom headers. */
int i;
struct bbiZoomLevel *level, *levelList = NULL;
for (i=0; i<bbi->zoomLevels; ++i)
{
AllocVar(level);
level->reductionLevel = udcReadBits32(udc, isSwapped);
level->reserved = udcReadBits32(udc, isSwapped);
level->dataOffset = udcReadBits64(udc, isSwapped);
level->indexOffset = udcReadBits64(udc, isSwapped);
slAddHead(&levelList, level);
}
slReverse(&levelList);
bbi->levelList = levelList;
/* Attach B+ tree of chromosome names and ids. */
udcSeek(udc, bbi->chromTreeOffset);
bbi->chromBpt = bptFileAttach(fileName, udc);
return bbi;
}
static struct bbiSummary *bbiSummariesInRegion(struct bbiZoomLevel *zoom, struct bbiFile *bbi,
int chromId, bits32 start, bits32 end)
/* Return list of all summaries in region at given zoom level of bbiFile. */
{
struct bbiSummary *sumList = NULL, *sum;
struct udcFile *udc = bbi->udc;
udcSeek(udc, zoom->indexOffset);
struct cirTreeFile *ctf = cirTreeFileAttach(bbi->fileName, bbi->udc);
struct fileOffsetSize *blockList = cirTreeFindOverlappingBlocks(ctf, chromId, start, end);
struct fileOffsetSize *block, *beforeGap, *afterGap;
/* Set up for uncompression optionally. */
char *uncompressBuf = NULL;
if (bbi->uncompressBufSize > 0)
uncompressBuf = needLargeMem(bbi->uncompressBufSize);
/* This loop is a little complicated because we merge the read requests for efficiency, but we
* have to then go back through the data one unmerged block at a time. */
for (block = blockList; block != NULL; )
{
/* Find contigious blocks and read them into mergedBuf. */
fileOffsetSizeFindGap(block, &beforeGap, &afterGap);
bits64 mergedOffset = block->offset;
bits64 mergedSize = beforeGap->offset + beforeGap->size - mergedOffset;
udcSeek(udc, mergedOffset);
char *mergedBuf = needLargeMem(mergedSize);
udcMustRead(udc, mergedBuf, mergedSize);
char *blockBuf = mergedBuf;
/* Loop through individual blocks within merged section. */
for (;block != afterGap; block = block->next)
{
/* Uncompress if necessary. */
char *blockPt, *blockEnd;
if (uncompressBuf)
{
blockPt = uncompressBuf;
int uncSize = zUncompress(blockBuf, block->size, uncompressBuf, bbi->uncompressBufSize);
blockEnd = blockPt + uncSize;
}
else
{
blockPt = blockBuf;
blockEnd = blockPt + block->size;
}
/* Figure out bounds and number of items in block. */
int blockSize = blockEnd - blockPt;
struct bbiSummaryOnDisk *dSum;
int itemSize = sizeof(*dSum);
assert(blockSize % itemSize == 0);
int itemCount = blockSize / itemSize;
/* Read in items and convert to memory list format. */
int i;
for (i=0; i<itemCount; ++i)
{
dSum = (void *)blockPt;
blockPt += sizeof(*dSum);
if (dSum->chromId == chromId)
{
int s = max(dSum->start, start);
int e = min(dSum->end, end);
if (s < e)
{
sum = bbiSummaryFromOnDisk(dSum);
slAddHead(&sumList, sum);
}
}
}
assert(blockPt == blockEnd);
blockBuf += block->size;
}
freeMem(mergedBuf);
}
freeMem(uncompressBuf);
slFreeList(&blockList);
cirTreeFileDetach(&ctf);
slReverse(&sumList);
return sumList;
}