The Tor Browser: intl/icu/source/common/bytestrieiterator.cpp@fc2d59ddac77 (annotated)

intl/icu/source/common/bytestrieiterator.cpp@fc2d59ddac77 (annotated)

intl/icu/source/common/bytestrieiterator.cpp

Wed, 31 Dec 2014 07:22:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:22:50 +0100
branch: TOR_BUG_3246
changeset 4: fc2d59ddac77
permissions: -rw-r--r--

Correct previous dual key logic pending first delivery installment.

 /*
 *******************************************************************************
 *   Copyright (C) 2010-2012, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *******************************************************************************
 *   file name:  bytestrieiterator.cpp
 *   encoding:   US-ASCII
 *   tab size:   8 (not used)
 *   indentation:4
 *
 *   created on: 2010nov03
 *   created by: Markus W. Scherer
 */
 #include "unicode/utypes.h"
 #include "unicode/bytestrie.h"
 #include "unicode/stringpiece.h"
 #include "charstr.h"
 #include "uvectr32.h"
 U_NAMESPACE_BEGIN
 BytesTrie::Iterator::Iterator(const void *trieBytes, int32_t maxStringLength,
                               UErrorCode &errorCode)
         : bytes_(static_cast<const uint8_t *>(trieBytes)),
           pos_(bytes_), initialPos_(bytes_),
           remainingMatchLength_(-1), initialRemainingMatchLength_(-1),
           str_(NULL), maxLength_(maxStringLength), value_(0), stack_(NULL) {
     if(U_FAILURE(errorCode)) {
         return;
     }
     // str_ and stack_ are pointers so that it's easy to turn bytestrie.h into
     // a public API header for which we would want it to depend only on
     // other public headers.
     // Unlike BytesTrie itself, its Iterator performs memory allocations anyway
     // via the CharString and UVector32 implementations, so this additional
     // cost is minimal.
     str_=new CharString();
     stack_=new UVector32(errorCode);
     if(U_SUCCESS(errorCode) && (str_==NULL || stack_==NULL)) {
         errorCode=U_MEMORY_ALLOCATION_ERROR;
     }
 }
 BytesTrie::Iterator::Iterator(const BytesTrie &trie, int32_t maxStringLength,
                               UErrorCode &errorCode)
         : bytes_(trie.bytes_), pos_(trie.pos_), initialPos_(trie.pos_),
           remainingMatchLength_(trie.remainingMatchLength_),
           initialRemainingMatchLength_(trie.remainingMatchLength_),
           str_(NULL), maxLength_(maxStringLength), value_(0), stack_(NULL) {
     if(U_FAILURE(errorCode)) {
         return;
     }
     str_=new CharString();
     stack_=new UVector32(errorCode);
     if(U_FAILURE(errorCode)) {
         return;
     }
     if(str_==NULL || stack_==NULL) {
         errorCode=U_MEMORY_ALLOCATION_ERROR;
         return;
     }
     int32_t length=remainingMatchLength_;  // Actual remaining match length minus 1.
     if(length>=0) {
         // Pending linear-match node, append remaining bytes to str_.
         ++length;
         if(maxLength_>0 && length>maxLength_) {
             length=maxLength_;  // This will leave remainingMatchLength>=0 as a signal.
         }
         str_->append(reinterpret_cast<const char *>(pos_), length, errorCode);
         pos_+=length;
         remainingMatchLength_-=length;
     }
 }
 BytesTrie::Iterator::~Iterator() {
     delete str_;
     delete stack_;
 }
 BytesTrie::Iterator &
 BytesTrie::Iterator::reset() {
     pos_=initialPos_;
     remainingMatchLength_=initialRemainingMatchLength_;
     int32_t length=remainingMatchLength_+1;  // Remaining match length.
     if(maxLength_>0 && length>maxLength_) {
         length=maxLength_;
     }
     str_->truncate(length);
     pos_+=length;
     remainingMatchLength_-=length;
     stack_->setSize(0);
     return *this;
 }
 UBool
 BytesTrie::Iterator::hasNext() const { return pos_!=NULL || !stack_->isEmpty(); }
 UBool
 BytesTrie::Iterator::next(UErrorCode &errorCode) {
     if(U_FAILURE(errorCode)) {
         return FALSE;
     }
     const uint8_t *pos=pos_;
     if(pos==NULL) {
         if(stack_->isEmpty()) {
             return FALSE;
         }
         // Pop the state off the stack and continue with the next outbound edge of
         // the branch node.
         int32_t stackSize=stack_->size();
         int32_t length=stack_->elementAti(stackSize-1);
         pos=bytes_+stack_->elementAti(stackSize-2);
         stack_->setSize(stackSize-2);
         str_->truncate(length&0xffff);
         length=(int32_t)((uint32_t)length>>16);
         if(length>1) {
             pos=branchNext(pos, length, errorCode);
             if(pos==NULL) {
                 return TRUE;  // Reached a final value.
             }
         } else {
             str_->append((char)*pos++, errorCode);
         }
     }
     if(remainingMatchLength_>=0) {
         // We only get here if we started in a pending linear-match node
         // with more than maxLength remaining bytes.
         return truncateAndStop();
     }
     for(;;) {
         int32_t node=*pos++;
         if(node>=kMinValueLead) {
             // Deliver value for the byte sequence so far.
             UBool isFinal=(UBool)(node&kValueIsFinal);
             value_=readValue(pos, node>>1);
             if(isFinal || (maxLength_>0 && str_->length()==maxLength_)) {
                 pos_=NULL;
             } else {
                 pos_=skipValue(pos, node);
             }
             sp_.set(str_->data(), str_->length());
             return TRUE;
         }
         if(maxLength_>0 && str_->length()==maxLength_) {
             return truncateAndStop();
         }
         if(node<kMinLinearMatch) {
             if(node==0) {
                 node=*pos++;
             }
             pos=branchNext(pos, node+1, errorCode);
             if(pos==NULL) {
                 return TRUE;  // Reached a final value.
             }
         } else {
             // Linear-match node, append length bytes to str_.
             int32_t length=node-kMinLinearMatch+1;
             if(maxLength_>0 && str_->length()+length>maxLength_) {
                 str_->append(reinterpret_cast<const char *>(pos),
                             maxLength_-str_->length(), errorCode);
                 return truncateAndStop();
             }
             str_->append(reinterpret_cast<const char *>(pos), length, errorCode);
             pos+=length;
         }
     }
 }
 UBool
 BytesTrie::Iterator::truncateAndStop() {
     pos_=NULL;
     sp_.set(str_->data(), str_->length());
     value_=-1;  // no real value for str
     return TRUE;
 }
 // Branch node, needs to take the first outbound edge and push state for the rest.
 const uint8_t *
 BytesTrie::Iterator::branchNext(const uint8_t *pos, int32_t length, UErrorCode &errorCode) {
     while(length>kMaxBranchLinearSubNodeLength) {
         ++pos;  // ignore the comparison byte
         // Push state for the greater-or-equal edge.
         stack_->addElement((int32_t)(skipDelta(pos)-bytes_), errorCode);
         stack_->addElement(((length-(length>>1))<<16)|str_->length(), errorCode);
         // Follow the less-than edge.
         length>>=1;
         pos=jumpByDelta(pos);
     }
     // List of key-value pairs where values are either final values or jump deltas.
     // Read the first (key, value) pair.
     uint8_t trieByte=*pos++;
     int32_t node=*pos++;
     UBool isFinal=(UBool)(node&kValueIsFinal);
     int32_t value=readValue(pos, node>>1);
     pos=skipValue(pos, node);
     stack_->addElement((int32_t)(pos-bytes_), errorCode);
     stack_->addElement(((length-1)<<16)|str_->length(), errorCode);
     str_->append((char)trieByte, errorCode);
     if(isFinal) {
         pos_=NULL;
         sp_.set(str_->data(), str_->length());
         value_=value;
         return NULL;
     } else {
         return pos+value;
     }
 }
 U_NAMESPACE_END

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intl/icu/source/common/bytestrieiterator.cpp@fc2d59ddac77 (annotated)

intl/icu/source/common/bytestrieiterator.cpp