diff options
Diffstat (limited to '3rdparty/clucene/src/CLucene/util/StringBuffer.cpp')
| -rw-r--r-- | 3rdparty/clucene/src/CLucene/util/StringBuffer.cpp | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/3rdparty/clucene/src/CLucene/util/StringBuffer.cpp b/3rdparty/clucene/src/CLucene/util/StringBuffer.cpp new file mode 100644 index 000000000..b5f1ca238 --- /dev/null +++ b/3rdparty/clucene/src/CLucene/util/StringBuffer.cpp @@ -0,0 +1,335 @@ +/*------------------------------------------------------------------------------ +* Copyright (C) 2003-2006 Ben van Klinken and the CLucene Team +* +* Distributable under the terms of either the Apache License (Version 2.0) or +* the GNU Lesser General Public License, as specified in the COPYING file. +------------------------------------------------------------------------------*/ +#include "CLucene/StdHeader.h" +#include "StringBuffer.h" +#include "Misc.h" + +CL_NS_DEF(util) + + StringBuffer::StringBuffer(TCHAR* buf,int32_t maxlen, const bool consumeBuffer){ + buffer = buf; + bufferLength = maxlen; + bufferOwner = !consumeBuffer; + len = 0; + } + StringBuffer::StringBuffer(){ + //Func - Constructor. Allocates a buffer with the default length. + //Pre - true + //Post - buffer of length bufferLength has been allocated + + //Initialize + bufferLength = LUCENE_DEFAULT_TOKEN_BUFFER_SIZE; + len = 0; + //Allocate a buffer of length bufferLength + buffer = _CL_NEWARRAY(TCHAR,bufferLength); + bufferOwner = true; + } + + StringBuffer::StringBuffer(const int32_t initSize){ + //Func - Constructor. Allocates a buffer of length initSize + 1 + //Pre - initSize > 0 + //Post - A buffer has been allocated of length initSize + 1 + + //Initialize the bufferLength to initSize + 1 The +1 is for the terminator '\0' + bufferLength = initSize + 1; + len = 0; + //Allocate a buffer of length bufferLength + buffer = _CL_NEWARRAY(TCHAR,bufferLength); + bufferOwner = true; + } + + StringBuffer::StringBuffer(const TCHAR* value){ + //Func - Constructor. + // Creates an instance of Stringbuffer containing a copy of the string value + //Pre - value != NULL + //Post - An instance of StringBuffer has been created containing the copy of the string value + + //Initialize the length of the string to be stored in buffer + len = (int32_t) _tcslen(value); + + //Calculate the space occupied in buffer by a copy of value + const int32_t occupiedLength = len + 1; + + // Minimum allocated buffer length is LUCENE_DEFAULT_TOKEN_BUFFER_SIZE. + bufferLength = (occupiedLength >= LUCENE_DEFAULT_TOKEN_BUFFER_SIZE + ? occupiedLength : LUCENE_DEFAULT_TOKEN_BUFFER_SIZE); + + //Allocate a buffer of length bufferLength + buffer = _CL_NEWARRAY(TCHAR,bufferLength); + bufferOwner = true; + //Copy the string value into buffer + _tcsncpy(buffer, value, occupiedLength); + //Assert that the buffer has been terminated at the end of the string + CND_PRECONDITION (buffer[len] == '\0', "Buffer was not correctly terminated"); + } + + StringBuffer::~StringBuffer() { + // Func - Destructor + // Pre - true + // Post - Instanc has been destroyed + + if( bufferOwner ){ + _CLDELETE_CARRAY(buffer); + }else + buffer = NULL; + } + void StringBuffer::clear(){ + //Func - Clears the Stringbuffer and resets it to it default empty state + //Pre - true + //Post - pre(buffer) has been destroyed and a new one has been allocated + + //Destroy the current buffer if present + _CLDELETE_CARRAY(buffer); + + //Initialize + len = 0; + bufferLength = LUCENE_DEFAULT_TOKEN_BUFFER_SIZE; + //Allocate a buffer of length bufferLength + buffer = _CL_NEWARRAY(TCHAR,bufferLength); + } + + void StringBuffer::appendChar(const TCHAR character) { + //Func - Appends a single character + //Pre - true + //Post - The character has been appended to the string in the buffer + + //Check if the current buffer length is sufficient to have the string value appended + if (len + 1 > bufferLength){ + //Have the size of the current string buffer increased because it is too small + growBuffer(len + 1); + } + //Put character at position len which is the end of the string in the buffer + //Note that this action might overwrite the terminator of the string '\0', which + //is kind of tricky + buffer[len] = character; + //Increase the len by to represent the correct length of the string in the buffer + len++; + } + + void StringBuffer::append(const TCHAR* value) { + //Func - Appends a copy of the string value + //Pre - value != NULL + //Post - value has been copied and appended to the string in buffer + + append(value, _tcslen(value)); + } + void StringBuffer::append(const TCHAR* value, size_t appendedLength) { + //Func - Appends a copy of the string value + //Pre - value != NULL + // appendedLength contains the length of the string value which is to be appended + //Post - value has been copied and appended to the string in buffer + + //Check if the current buffer length is sufficient to have the string value appended + if (len + appendedLength + 1 > bufferLength){ + //Have the size of the current string buffer increased because it is too small + growBuffer(len + appendedLength + 1); + } + + //Copy the string value into the buffer at postion len + _tcsncpy(buffer + len, value, appendedLength); + + //Add the length of the copied string to len to reflect the new length of the string in + //the buffer (Note: len is not the bufferlength!) + len += appendedLength; + } + + void StringBuffer::appendInt(const int32_t value) { + //Func - Appends an integer (after conversion to a character string) + //Pre - true + //Post - The converted integer value has been appended to the string in buffer + + //instantiate a buffer of 30 charactes for the conversion of the integer + TCHAR buf[30]; + //Convert the integer value to a string buf using the radix 10 (duh) + _i64tot(value, buf, 10); + //Have the converted integer now stored in buf appended to the string in buffer + append(buf); + } + + void StringBuffer::appendFloat(const qreal value, const int32_t digits){ + //Func - Appends a qreal (after conversion to a character string) + //Pre - digits > 0. Indicates the minimum number of characters printed + //Post - The converted qreal value has been appended to the string in buffer + + //using sprintf("%f" was not reliable on other plaforms... we use a custom float convertor + //bvk: also, using sprintf and %f seems excessivelly slow + if(digits>8) + _CLTHROWA(CL_ERR_IllegalArgument,"Too many digits..."); + + //the maximum number of characters that int64 will hold is 23. so we need 23*2+2 + TCHAR buf[48]; //the buffer to hold + int64_t v = (int64_t)value; //the integer value of the float + _i64tot(v,buf,10); //add the whole number + + size_t len = 99-_tcslen(buf); //how many digits we have to work with? + size_t dig = len< (size_t)digits ? len : digits; + if ( dig > 0 ){ + _tcscat(buf,_T(".")); //add a decimal point + + int64_t remi=(int64_t)((value-v)*pow((qreal)10,(qreal)(dig+1))); //take the remainder and make a whole number + if ( remi<0 ) remi*=-1; + int64_t remadj=remi/10; + if ( remi-(remadj*10) >=5 ) + remadj++; //adjust remainder + + // add as many zeros as necessary between the decimal point and the + // significant part of the number. Fixes a bug when trying to print + // numbers that have zeros right after the decimal point + if (remadj) { + int32_t numZeros = dig - (int32_t)log10((qreal)remadj) - 1; + while(numZeros-- > 0) + _tcscat(buf,_T("0")); //add a zero before the decimal point + } + + _i64tot(remadj,buf+_tcslen(buf),10); //add the remainder + } + + append(buf); + } + + void StringBuffer::prepend(const TCHAR* value){ + //Func - Puts a copy of the string value infront of the current string in the StringBuffer + //Pre - value != NULL + //Post - The string in pre(buffer) has been shifted n positions where n equals the length of value. + // The string value was then copied to the beginning of stringbuffer + + prepend(value, _tcslen(value)); + } + + void StringBuffer::prepend(const TCHAR* value, const size_t prependedLength) { + //Func - Puts a copy of the string value in front of the string in the StringBuffer + //Pre - value != NULL + // prependedLength contains the length of the string value which is to be prepended + //Post - A copy of the string value is has been in front of the string in buffer + //todo: something is wrong with this code, i'm sure... it only grows (and therefore moves if the buffer is to small) + //Check if the current buffer length is sufficient to have the string value prepended + if (prependedLength + len + 1 > bufferLength){ + //Have the size of the current string buffer increased because it is too small + //Because prependedLength is passed as the second argument to growBuffer, + //growBuffer will have left the first prependedLength characters empty + //when it recopied buffer during reallocation. + growBuffer(prependedLength + len + 1, prependedLength); + } + + //Copy the string value into the buffer at postion 0 + _tcsncpy(buffer, value, prependedLength); + //Add the length of the copied string to len to reflect the new length of the string in + //the buffer (Note: len is not the bufferlength!) + len += prependedLength; + } + + int32_t StringBuffer::length() const{ + //Func - Returns the length of the string in the StringBuffer + //Pre - true + //Post - The length len of the string in the buffer has been returned + + return len; + } + TCHAR* StringBuffer::toString(){ + //Func - Returns a copy of the current string in the StringBuffer sized equal to the length of the string + // in the StringBuffer. + //Pre - true + //Post - The copied string has been returned + + //Instantiate a buffer equal to the length len + 1 + TCHAR* ret = _CL_NEWARRAY(TCHAR,len + 1); + if (ret){ + //Copy the string in buffer + _tcsncpy(ret, buffer, len); + //terminate the string + ret[len] = '\0'; + } + //return the the copy + return ret; + } + TCHAR* StringBuffer::getBuffer() { + //Func - '\0' terminates the buffer and returns its pointer + //Pre - true + //Post - buffer has been '\0' terminated and returned + + // Check if the current buffer is '\0' terminated + if (len == bufferLength){ + //Make space for terminator, if necessary. + growBuffer(len + 1); + } + //'\0' buffer so it can be returned properly + buffer[len] = '\0'; + + return buffer; + } + + void StringBuffer::reserve(const int32_t size){ + if ( bufferLength >= size ) + return; + bufferLength = size; + + //Allocate a new buffer of length bufferLength + TCHAR* tmp = _CL_NEWARRAY(TCHAR,bufferLength); + _tcsncpy(tmp, buffer, len); + tmp[len] = '\0'; + + //destroy the old buffer + if (buffer){ + _CLDELETE_CARRAY(buffer); + } + //Assign the new buffer tmp to buffer + buffer = tmp; + } + + void StringBuffer::growBuffer(const int32_t minLength) { + //Func - Has the buffer grown to a minimum length of minLength or bigger + //Pre - minLength >= len + 1 + //Post - The buffer has been grown to a minimum length of minLength or bigger + + growBuffer(minLength, 0); + } + void StringBuffer::growBuffer(const int32_t minLength, const int32_t skippingNInitialChars) { + //Func - Has the buffer grown to a minimum length of minLength or bigger and shifts the + // current string in buffer by skippingNInitialChars forward + //Pre - After growth, must have at least enough room for contents + terminator so + // minLength >= skippingNInitialChars + len + 1 + // skippingNInitialChars >= 0 + //Post - The buffer has been grown to a minimum length of minLength or bigger and + // if skippingNInitialChars > 0, the contents of the buffer has beeen shifted + // forward by skippingNInitialChars positions as the buffer is reallocated, + // leaving the first skippingNInitialChars uninitialized (presumably to be + // filled immediately thereafter by the caller). + + CND_PRECONDITION (skippingNInitialChars >= 0, "skippingNInitialChars is less than zero"); + CND_PRECONDITION (minLength >= skippingNInitialChars + len + 1,"skippingNInitialChars is not large enough"); + + //More aggressive growth strategy to offset smaller default buffer size: + if ( !bufferOwner ){ + if ( bufferLength<minLength ) + _CLTHROWA(CL_ERR_IllegalArgument,"[StringBuffer::grow] un-owned buffer could not be grown"); + return; + } + + bufferLength *= 2; + //Check that bufferLength is bigger than minLength + if (bufferLength < minLength){ + //Have bufferLength become minLength because it still was too small + bufferLength = minLength; + } + + //Allocate a new buffer of length bufferLength + TCHAR* tmp = _CL_NEWARRAY(TCHAR,bufferLength); + //The old buffer might not have been null-terminated, so we _tcsncpy + //only len bytes, not len+1 bytes (the latter might read one char off the + //end of the old buffer), then apply the terminator to the new buffer. + _tcsncpy(tmp + skippingNInitialChars, buffer, len); + tmp[skippingNInitialChars + len] = '\0'; + + //destroy the old buffer + if (buffer){ + _CLDELETE_CARRAY(buffer); + } + //Assign the new buffer tmp to buffer + buffer = tmp; + } + +CL_NS_END |