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More adjustments to improve code clarity

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This commit is contained in:
senhuang42 2020-11-03 13:05:57 -05:00
parent 48f67da854
commit c44ce29013
1 changed files with 60 additions and 58 deletions
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118
lib/compress/zstd_compress.c
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@ -4526,7 +4526,7 @@ static int ZSTD_updateSequenceRange(ZSTD_sequenceRange* sequenceRange, size_t bl
DEBUGLOG(4, "endPosInSequence begin val: %u", endPosInSequence);
while (endPosInSequence && idx < inSeqsSize) {
ZSTD_Sequence currSeq = inSeqs[idx];
DEBUGLOG(4, "curr Seq: idx: %u ll: %u ml: %u, of: %u", idx, currSeq.litLength, currSeq.matchLength, currSeq.offset);
DEBUGLOG(5, "curr Seq: idx: %u ll: %u ml: %u, of: %u", idx, currSeq.litLength, currSeq.matchLength, currSeq.offset);
if (endPosInSequence >= currSeq.litLength + currSeq.matchLength) {
endPosInSequence -= currSeq.litLength + currSeq.matchLength;
idx++;
@ -4537,7 +4537,6 @@ static int ZSTD_updateSequenceRange(ZSTD_sequenceRange* sequenceRange, size_t bl
if (format == ZSTD_sf_noBlockDelimiters) {
assert(endPosInSequence <= inSeqs[idx].litLength + inSeqs[idx].matchLength);
DEBUGLOG(4, "idx: %u", idx);
if (idx != inSeqsSize && endPosInSequence > inSeqs[idx].litLength) {
DEBUGLOG(4, "Endpos is in the match");
if (inSeqs[idx].matchLength >= blockSize) {
@ -4576,8 +4575,8 @@ static int ZSTD_updateSequenceRange(ZSTD_sequenceRange* sequenceRange, size_t bl
/* Returns size of sequences range copied, otherwise ZSTD error code */
static size_t ZSTD_copySequencesToSeqStore(seqStore_t* seqStore, const ZSTD_sequenceRange* seqRange,
const ZSTD_Sequence* const inSeqs, size_t inSeqsSize,
const void* src, size_t srcSize, ZSTD_sequenceFormat_e format) {
const ZSTD_Sequence* const inSeqs, size_t inSeqsSize,
const void* src, size_t srcSize, ZSTD_sequenceFormat_e format) {
DEBUGLOG(4, "ZSTD_copySequencesToSeqStore: numSeqs: %zu srcSize: %zu", inSeqsSize, srcSize);
size_t idx = seqRange->startIdx;
BYTE const* istart = (BYTE const*)src;
@ -4589,79 +4588,84 @@ static size_t ZSTD_copySequencesToSeqStore(seqStore_t* seqStore, const ZSTD_sequ
U32 matchLength = inSeqs[idx].matchLength;
U32 offCode = inSeqs[idx].offset + ZSTD_REP_MOVE;
/* Adjust litLength and matchLength for the sequence at startIdx */
/* Adjust litLength and matchLength if we're at either the start or end index of the range */
if (seqRange->startIdx == seqRange->endIdx) {
/* The sequence spans the entire block */
U32 seqLength = seqRange->endPosInSequence - seqRange->startPosInSequence;
RETURN_ERROR_IF(seqLength > litLength + matchLength, corruption_detected, "SeqLength cannot be bigger than sequence length!");
RETURN_ERROR_IF(seqLength > litLength + matchLength, corruption_detected,
"range length cannot be bigger than sequence length!");
if (seqLength <= litLength) {
/* Sequence is entirely literals, break and store last literals */
/* Spanned range is entirely literals, store as last literals */
break;
} else if (seqLength <= litLength + matchLength) {
} else {
/* Spanned range ends in the match section */
matchLength = seqLength - litLength;
}
} else if (idx == seqRange->startIdx) {
U32 posInSequence = seqRange->startPosInSequence;
DEBUGLOG(4, "At startIdx: idx: %u PIS: %u", idx, posInSequence);
DEBUGLOG(4, "startIdx: %u PIS: %u", idx, posInSequence);
DEBUGLOG(4, "startIdx seq initial: (of: %u ml: %u ll: %u) rep: %u", offCode, matchLength, litLength, inSeqs[idx].rep);
assert(posInSequence <= litLength + matchLength);
RETURN_ERROR_IF(format == ZSTD_sf_explicitBlockDelimiters && posInSequence != 0,
corruption_detected, "pos in sequence must == 0 when using block delimiters!");
if (posInSequence >= litLength) {
/* position is within the match */
/* Start position within sequence is within the match */
posInSequence -= litLength;
litLength = 0;
matchLength -= posInSequence;
} else {
/* position is within the literals */
/* Start position within sequence is within the literals */
litLength -= posInSequence;
}
if (matchLength <= MINMATCH && offCode != ZSTD_REP_MOVE /* dont trigger this in lastLL case */) {
DEBUGLOG(4, "start idx: %zu, seq: (ll: %u, ml: %u, of: %u)", idx, litLength, matchLength, offCode);
RETURN_ERROR_IF(matchLength < MINMATCH, corruption_detected, "Matchlength too small! Start Idx");
}
DEBUGLOG(4, "startIdx seq finalized: ll: %u ml: %u", litLength, matchLength);
/* ZSTD_updateSequenceRange should never give us a position such that we generate a match too small */
RETURN_ERROR_IF(matchLength < MINMATCH && offCode != ZSTD_REP_MOVE, corruption_detected,
"Matchlength too small at start of range!");
DEBUGLOG(4, "startIdx seq finalized: (of: %u ml: %u ll: %u) rep: %u", offCode, matchLength, litLength, inSeqs[idx].rep);
} else if (idx == seqRange->endIdx) {
U32 posInSequence = seqRange->endPosInSequence;
DEBUGLOG(4, "Reached endIdx. idx: %u PIS: %u", idx, posInSequence);
if (posInSequence == 0) {
RETURN_ERROR_IF(inSeqs[seqRange->endIdx - 1].matchLength != 0 || inSeqs[seqRange->endIdx - 1].matchLength != 0,
corruption_detected, "Contract violation");
}
DEBUGLOG(4, "endIdx: %u PIS: %u", idx, posInSequence);
DEBUGLOG(4, "endIdx seq initial: (of: %u ml: %u ll: %u) rep: %u", offCode, matchLength, litLength, inSeqs[idx].rep);
assert(posInSequence <= litLength + matchLength);
RETURN_ERROR_IF(format == ZSTD_sf_explicitBlockDelimiters && posInSequence != 0,
corruption_detected, "pos in sequence must == 0 when using block delimiters!");
if (posInSequence <= litLength) {
/* position is within the last literals, break and store last literals */
/* End position within is within the literals, break and store last literals if any */
break;
} else {
/* position is within the match */
/* End position is within the match */
matchLength = posInSequence - litLength;
/* ZSTD_updateSequenceRange should never give us a position such that we generate a match too small */
if (matchLength <= MINMATCH && offCode != ZSTD_REP_MOVE) {
DEBUGLOG(4, "start idx: %zu, seq: (ll: %u, ml: %u, of: %u)", idx, litLength, matchLength, offCode);
RETURN_ERROR_IF(matchLength < MINMATCH, corruption_detected, "Matchlength too small! Start Idx");
}
}
DEBUGLOG(4, "endIdx seq finalized: ll:%u ml: %u", litLength, matchLength);
/* ZSTD_updateSequenceRange should never give us a position such that we generate a match too small */
RETURN_ERROR_IF(matchLength < MINMATCH && offCode != ZSTD_REP_MOVE, corruption_detected,
"Matchlength too small at end of range!");
DEBUGLOG(4, "endIdx seq finalized: (of: %u ml: %u ll: %u) rep: %u", offCode, matchLength, litLength, inSeqs[idx].rep);
}
/* ML == 0 and Offset == 0 (or offCode == ZSTD_REP_MOVE) signals block delimiters */
if (matchLength == 0 && offCode == ZSTD_REP_MOVE) {
RETURN_ERROR_IF(format == ZSTD_sf_noBlockDelimiters, corruption_detected, "No block delimiters allowed!");
/* Handle last literals case */
if (litLength > 0) {
DEBUGLOG(4, "Storing last literals: %u bytes, idx: %u", litLength, idx);
DEBUGLOG(4, "Storing block delim last literals: %u bytes, idx: %u", litLength, idx);
const BYTE* const lastLiterals = (const BYTE*)src + srcSize - litLength;
ZSTD_storeLastLiterals(seqStore, lastLiterals, litLength);
}
continue;
}
DEBUGLOG(4, "Storing in actual seqStore idx: %zu, seq: (ll: %u, ml: %u, of: %u), rep: %u", idx, litLength, matchLength - MINMATCH, offCode, inSeqs[idx].rep);
RETURN_ERROR_IF(matchLength < MINMATCH, corruption_detected, "Matchlength too small! of: %u ml: %u ll: %u", offCode, matchLength, litLength);
if (inSeqs[idx].rep) {
ZSTD_storeSeq(seqStore, litLength, ip, iend, inSeqs[idx].rep - 1, matchLength - MINMATCH);
} else {
ZSTD_storeSeq(seqStore, litLength, ip, iend, offCode, matchLength - MINMATCH);
DEBUGLOG(4, "Storing: idx: %zu (ll: %u, ml: %u, of: %u) rep: %u", idx, litLength, matchLength - MINMATCH, offCode, inSeqs[idx].rep);
RETURN_ERROR_IF(matchLength < MINMATCH, corruption_detected, "Matchlength too small! of: %u ml: %u ll: %u", offCode, matchLength, litLength);
if (inSeqs[idx].rep) {
ZSTD_storeSeq(seqStore, litLength, ip, iend, inSeqs[idx].rep - 1, matchLength - MINMATCH);
} else {
ZSTD_storeSeq(seqStore, litLength, ip, iend, offCode, matchLength - MINMATCH);
}
}
ip += matchLength + litLength;
}
/* Store any last literals for ZSTD_sf_noBlockDelimiters mode */
if (format == ZSTD_sf_noBlockDelimiters && ip != iend) {
assert(ip <= iend);
U32 lastLLSize = (U32)(iend - ip);
@ -4687,7 +4691,6 @@ size_t ZSTD_compressSequences_ext_internal(void* dst, size_t dstCapacity,
seqStore_t blockSeqStore;
blockSeqStore.longLengthID = 0;
blockSeqStore.longLengthPos = 0;
size_t origDstCapacity = dstCapacity;
DEBUGLOG(4, "ZSTD_compressSequences_ext_internal srcSize: %zu, inSeqsSize: %zu", srcSize, inSeqsSize);
@ -4705,7 +4708,7 @@ size_t ZSTD_compressSequences_ext_internal(void* dst, size_t dstCapacity,
blockSize += additionalByteAdjustment;
DEBUGLOG(4, "Working on new block. Blocksize: %u", blockSize);
/* Skip over uncompressible blocks */
/* If blocks are too small, emit as a nocompress block */
if (blockSize < MIN_CBLOCK_SIZE+ZSTD_blockHeaderSize+1) {
cBlockSize = ZSTD_noCompressBlock(op, dstCapacity, ip, blockSize, lastBlock);
FORWARD_IF_ERROR(cBlockSize, "Nocompress block failed");
@ -4718,16 +4721,17 @@ size_t ZSTD_compressSequences_ext_internal(void* dst, size_t dstCapacity,
continue;
}
ZSTD_copySequencesToSeqStore(&blockSeqStore, &seqRange, inSeqs, inSeqsSize, ip, blockSize, format);
FORWARD_IF_ERROR(ZSTD_copySequencesToSeqStore(&blockSeqStore, &seqRange, inSeqs, inSeqsSize, ip, blockSize, format),
"Sequence copying failed");
compressedSeqsSize = ZSTD_compressSequences(&blockSeqStore,
&cctx->blockState.prevCBlock->entropy, &cctx->blockState.nextCBlock->entropy,
&cctx->appliedParams,
op + ZSTD_blockHeaderSize, dstCapacity - ZSTD_blockHeaderSize,
op + ZSTD_blockHeaderSize /* Leave space for block header */, dstCapacity - ZSTD_blockHeaderSize,
blockSize,
cctx->entropyWorkspace, ENTROPY_WORKSPACE_SIZE /* statically allocated in resetCCtx */,
cctx->bmi2);
FORWARD_IF_ERROR(compressedSeqsSize, "Compressing block errored");
DEBUGLOG(4, "Compressed sequences size : %u", compressedSeqsSize);
FORWARD_IF_ERROR(compressedSeqsSize, "Compressing sequences of block failed");
DEBUGLOG(4, "Compressed sequences size: %u", compressedSeqsSize);
if (compressedSeqsSize == 0) {
/* ZSTD_noCompressBlock writes the block header as well */
@ -4736,25 +4740,25 @@ size_t ZSTD_compressSequences_ext_internal(void* dst, size_t dstCapacity,
DEBUGLOG(4, "Block uncompressible, writing out nocompress block, size: %u", cBlockSize);
} else {
/* Error checking and repcodes update */
if (!ZSTD_isError(compressedSeqsSize) && compressedSeqsSize > 1) {
if (compressedSeqsSize > 1) {
ZSTD_confirmRepcodesAndEntropyTables(cctx);
}
/* Write block header */
if (cctx->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
cctx->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
/* Write block header into beginning of block*/
U32 const cBlockHeader = compressedSeqsSize == 1 ?
lastBlock + (((U32)bt_rle)<<1) + (U32)(blockSize << 3):
lastBlock + (((U32)bt_compressed)<<1) + (U32)(compressedSeqsSize << 3);
MEM_writeLE24(op, cBlockHeader);
cBlockSize = ZSTD_blockHeaderSize + compressedSeqsSize;
DEBUGLOG(4, "Writing out compressed block, size: %u", cBlockSize);
if (cctx->blockState.prevCBlock->entropy.fse.offcode_repeatMode == FSE_repeat_valid)
cctx->blockState.prevCBlock->entropy.fse.offcode_repeatMode = FSE_repeat_check;
}
cSize += cBlockSize;
DEBUGLOG(4, "cumulative cSize: %u", cSize);
if (lastBlock) {
DEBUGLOG(4, "reached last block, stopping");
break;
} else {
ip += blockSize;
@ -4786,7 +4790,7 @@ size_t ZSTD_compressSequences_ext(void* dst, size_t dstCapacity,
if (dstCapacity < ZSTD_compressBound(srcSize))
RETURN_ERROR(dstSize_tooSmall, "Destination buffer too small!");
/* Begin writing output */
/* Begin writing output, starting with frame header */
frameHeaderSize = ZSTD_writeFrameHeader(op, dstCapacity, &cctx->appliedParams, srcSize, cctx->dictID);
op += frameHeaderSize;
dstCapacity -= frameHeaderSize;
@ -4798,11 +4802,9 @@ size_t ZSTD_compressSequences_ext(void* dst, size_t dstCapacity,
/* cSize includes block header size and compressed sequences size */
compressedBlocksSize = ZSTD_compressSequences_ext_internal(op, dstCapacity,
cctx, inSeqs, inSeqsSize,
src, srcSize, format);
if (ZSTD_isError(compressedBlocksSize)) {
return compressedBlocksSize;
}
cctx, inSeqs, inSeqsSize,
src, srcSize, format);
FORWARD_IF_ERROR(compressedBlocksSize, "Block compression failed!");
cSize += compressedBlocksSize;
dstCapacity -= compressedBlocksSize;
DEBUGLOG(4, "cSize after compressSequences_internal: %zu", cSize);