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SPExtractor.c
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SPExtractor.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "SPExtractor.h"
/**
* This function reads the next entire line from file stream, allocates enough space to store the text
* (including the null character, not including the new line) and storing it in *lineptr.
* When the function returns, *lineptr is a char* which points to the text of the line.
*
* @param linePtr Address of the line to be written to
* @param feats FILE stream to be read.
*
* @return
* -1 for failure if one of the following occurred:
* - Memory allocation Error
* - linePtr == NULL || feats == NULL
* - Reading Error
* - Got EOF character (not supposed to happen)
* 0 for success
*/
int SPgetLine(char** linePtr, FILE* feats) {
declareLogMsg();
if (!linePtr || !feats) {
InvalidError()
return ERROR;
}
/* Initializations */
char *chk;
char line[MAX_FEATS_LINE];
int size;
/* Get the line */
chk = fgets(line, MAX_FEATS_LINE, feats);
if (!chk) {
printWarning(READ_ERR)
return ERROR;
}
if (*line == '\n') {
printWarning(SPACE_ERR)
return ERROR;
}
/* size of actual line copied */
size = strlen(line);
/* sanity check */
line[size] = '\0';
/* allocation for line to be returned */
*linePtr = (char*) malloc(size + 1);
if (*linePtr == NULL) {
MallocError()
return ERROR;
}
/* Copy the characters */
strcpy(*linePtr, line);
return OK;
}
/**
* This function reads the next entire line from file stream, and returns the integer found in it,
* using the strtol function (technicaly accetps hex numbers also using 0x or 0X before the number).
* The function can accept space characters ONLY (no '\n', obviously, because it reads only one line)
* before and after the integer, but no other characters are permitted.
*
* @see strtol
*
* @param feats FILE stream to be read.
*
* @return
* -1 for failure if one of the following occurred:
* - Memory allocation Error
* - feats == NULL
* - Reading Error
* - Got EOF character (not supposed to happen)
* - Other characters that are not number found on line (and the number is not correct hexadecimal)
* otherwise the converted integer
*/
int getIntFromLine(FILE* feats) {
declareLogMsg();
int integer;
char *line = NULL,
*tmp, *ptrChk; //tail pointer for strtol
/* get the line. if error - message prints inside */
if (SPgetLine(&line, feats) == ERROR)
return ERROR;
/* attempt to parse an int from the line */
integer = strtol(line, &ptrChk, 0);
/* check if any characters left after the number */
if (ptrChk != NULL && *ptrChk != '\0') {
/* read tail */
for (tmp = ptrChk; *tmp != '\0'; tmp++) {
/* allow only space characters after the number */
if (!isspace(*tmp)) {
printWarning(CHAR_ERR)
free(line);
return ERROR;
}
}
}
if (integer < 0) {
printWarning(INDX_ERR)
free(line);
return ERROR;
}
/* no need for line anymore */
free(line);
return integer;
}
/**
* This function reads an array of doubles from a string, each one can be separated by space characters
* beforehand and afterhand. The doubles are then parsed by the @strtod function. No other characters
* are permitted.
*
* @see strtod
*
* @param line string to be read
* @param dim size of the expected array
* @param lineNumber number of the line in the file for debugging purposes
* @param imageIndex index of the image for debugging purposes
*
* @return
* NULL for failure if one of the following occurred:
* - Memory allocation Error
* - line == NULL || dim <= 0
* - Reading Error
* - Got EOF character (not supposed to happen)
* - Other characters that are not number found on line (and the number is not correct hexadecimal)
* - number of doubles converted is different than dim argument
* a new allocated double array the size of dim, with the converted doubles.
*/
double* getDataFromLine(char* line, int dim, int lineNumber, int imageIndex) {
declareLogMsg();
if (!line || dim <= 0) {
InvalidError()
return NULL;
}
/* Init */
char *c = line;
char *tail = NULL;
int count = 0,
i, lineCnt = 0;
double singleNumber = 0, *ret;
int lineLength = strlen(line) + 1;
/* allocated double array exactly the size of dim (spCADimension) */
ret = (double*) calloc(dim, sizeof(double));
if (!ret) {
MallocError()
return NULL;
}
/* read entire line */
while (lineCnt != lineLength && *c != '\0' && *c != EOF) { //EOF not supposed to happen, sanity check
if (isspace(*c)) {
c++;
lineCnt++;
continue;
}
i = 0;
char buffer[MAX_LENGTH] = { '\0' }; //must be declared here to be nulled every time
/* Read one double, until the next space (' ') found */
while (lineCnt != lineLength && !isspace(*c) && *c != '\0' && *c != EOF) { //new line or EOF shouldn't happen
/* Contains other characters than the valid double ones */
if (!isdigit(*c) && *c != '.' && *c != '-') {
warningWithArgs(FEAT_ERR2, count, lineNumber, *c, (int ) *c,
line)
free(ret);
return NULL;
}
/* store character in buffer */
buffer[i++] = *c;
c++;
lineCnt++;
}
tail = NULL;
/* i - basically strlen */
buffer[i] = '\0';
/* extract double */
singleNumber = strtod(buffer, &tail);
/* Error reading the double */
if (tail != NULL) {
if (*tail != '\0') {
printWarning(SYNTAX)
free(ret);
return NULL;
}
}
if (count == dim) { //means we already found dim+1 doubles in line
count++; //to signal count != dim
break;
}
ret[count++] = singleNumber;
c++;
lineCnt++;
}
/* Essentially found less numbers than dim, same error message - skipping file*/
if (count != dim) {
warningWithArgs(FEAT_SIZE_ERR, dim, lineNumber, imageIndex);
free(ret);
return NULL;
}
return ret;
}
/*
* Returns an SPPoint array that contains all features of a single image with the index imgIndex.
* Expected name of the .feats file are as the image filename, only with the extension ".feats"
* instead of the image extension (as the pattern defined in the configuration object).
* The size of the array is stored in *numOfFeatures.
*
* Format of the file is expected to be as created by the function exportImageToFile.
* @see exportImageToFile
* @see extractImagesFeatures for list of constraints of the file.
*
* If any error occurred, *numOfFeatures gets the value of 0.
*
* @param imgIndex Index of the relevant image
* @param numOfFeatures Address of the array size
* @param config Configuration attributes
*
* @return
* NULL if failure for one of the following reasons:
* - .feats File format invalid
* - config == NULL || numOfFeatures == NULL
* - SPConfig access error
* - Memory Allocation Failure
* - Reading Error
* - image index written in the file (first line) doesn't match argument imgIndex
* - The file doesn't contain the same amount of features as written on the second line of the file exactly
* Otherwise, a SPPoint array that contains all the features of the image.
*/
SPPoint* extractSingleImage(int imgIndex, int* numOfFeatures, SPConfig config) {
declareLogMsg();
if (!numOfFeatures || !config) {
InvalidError()
return NULL;
}
/*** Initializations ***/
char *ptr,
*line = NULL, filepath[MAX_LENGTH] = { '\0' };
FILE* feats;
int imageIndex, countOfFeatures = 0, dim, lineChk;
double* data;
SPPoint currentPoint, *pntsArray = NULL;
/*** Change filepath to .feats ***/
SP_CONFIG_MSG _conf_msg = spConfigGetImagePath(filepath, config, imgIndex),
*conf_msg = &_conf_msg;
returnIfConfigMsg(NULL);
ptr = filepath + strlen(filepath);
while (*ptr != '.' && ptr != filepath) {
*ptr = '\0';
ptr--;
}
if (ptr == filepath) {
printError(FEATS_SUFFIX);
}
sprintf(ptr, FEATS_EXT);
/** Try to open the feats file **/
feats = fopen(filepath, READ_MODE);
if (!feats) {
warningWithArgs(FILE_ERR, filepath)
return NULL;
}
/** get the image index from the first line **/
imageIndex = getIntFromLine(feats);
/* compare with the file name - if not equal or negative skip file */
if (imageIndex >= 0 && imageIndex != imgIndex) {
fclose(feats);
warningWithArgs(INDEX_ERR, imageIndex, filepath)
return NULL;
} else if (imageIndex < 0) {
errorReturn()
}
/** get the number of features in the second line **/
*numOfFeatures = getIntFromLine(feats);
if (*numOfFeatures < 0) {
errorReturn()
}
dim = spConfigGetPCADim(config, conf_msg);
pntsArray = (SPPoint*) calloc(*numOfFeatures, sizeof(*pntsArray));
if (!pntsArray) {
MallocError()
errorReturn()
}
/** Iterating through lines 3 and above of the feats file **/
while (!feof(feats)) {
data = NULL;
lineChk = SPgetLine(&line, feats);
if (lineChk == -1) {
//Error message printed inside SPgetLine
errorReturn()
}
/** Get double array from lines 3 and above **/
data = getDataFromLine(line, dim, countOfFeatures + 3, imageIndex);
if (data == NULL) {
//Error message printed inside getDataFromLine
free(line);
line = NULL;
errorReturn()
}
/** Create a point from the data extracted from the line **/
currentPoint = spPointCreate(data, dim, imageIndex);
free(data);
/*** ERRORS ***/
if (!currentPoint || countOfFeatures == *numOfFeatures) {
if (!currentPoint) { //error creating the point
MallocError()
} else {
/** Got more features than written in the file -
* this is a warning, skipping to next file
* while ignoring this one **/
spPointDestroy(currentPoint);
warningWithArgs(FEATS_QNTTY_MORE, *numOfFeatures);
}
/** freeing the resources that were ignored **/
free(line);
line = NULL;
errorReturn()
}
/** inserting point to returned array **/
if (countOfFeatures < *numOfFeatures)
pntsArray[countOfFeatures++] = currentPoint;
free(line);
line = NULL;
}
/** now can be less than within in the file. again - warning and skipping **/
if (countOfFeatures != *numOfFeatures) {
warningWithArgs(FEATS_QNTTY_LESS, countOfFeatures, *numOfFeatures);
free(line);
line = NULL;
errorReturn()
}
fclose(feats);
return pntsArray;
}
SPPoint* extractImagesFeatures(int* totalNumOfFeaturesPtr, SPConfig config) {
SPPoint* singleImageFeatures = NULL;
int* featAddr;
declareLogMsg();
declareConfMsg();
if (!config) {
printError(NO_CNFG);
return NULL;
}
int numOfImages = spConfigGetNumOfImages(config, conf_msg);
if (*conf_msg != SP_CONFIG_SUCCESS || numOfImages < 0) {
printError(NO_IMG_NUM);
return NULL;
}
/** First maintain a SPPoint matrix -
* each row is for a single image (every SPPoint is a feature of the said image)
* Also maintain a int array for the number of features for each image,
* because the number of features may vary.
* This is needed because only at the end we can know how many features we have
* overall, and then we could malloc the array to be added to kdarray properly.
* */
int* numOfFeatures = (int*) calloc(numOfImages, sizeof(int)); //array to hold num of features for each img
SPPoint** imagesFeatures = (SPPoint**) calloc(numOfImages, //matrix to hold
sizeof(SPPoint*));
if (!numOfFeatures || !imagesFeatures) {
MallocError()
free(numOfFeatures);
free(imagesFeatures);
return NULL;
}
int imgCount = 0;
for (int img = 0; img < numOfImages; img++) {
featAddr = &numOfFeatures[imgCount];
infoWithArgs(IMG_EXTR, img);
/* Extract features of single image from the appropriate file*/
singleImageFeatures = extractSingleImage(img, featAddr, config);
if (singleImageFeatures == NULL) {
free(singleImageFeatures);
numOfFeatures[img] = 0;
continue;
} else {
/** Insert the image's features to its row in the matrix **/
imagesFeatures[imgCount++] = singleImageFeatures;
}
}
/** No image features were imported **/
if (!imgCount) {
printError(NO_FEATS_IMPRT)
free(numOfFeatures);
free(imagesFeatures);
return NULL;
} else if (imgCount < numOfImages) {
/** Some of the images features were not imported
* Only warning - not finishing program **/
printWarning(SOME_FEATS);
}
/** Overall number of features added **/
int totalNumOfFeatures = 0;
for (int i = 0; i < numOfImages; i++) {
totalNumOfFeatures += numOfFeatures[i];
}
*totalNumOfFeaturesPtr = totalNumOfFeatures;
/** Copy all points from the matrix to a large single point
* array, to be inserted to a kdarray **/
SPPoint* allFeatures = (SPPoint*) calloc(totalNumOfFeatures,
sizeof(*allFeatures));
if (!allFeatures) {
MallocError()
for (int img = imgCount - 1; img >= 0; img--)
spPointArrayDestroy(imagesFeatures[img], numOfFeatures[img]);
free(numOfFeatures);
free(imagesFeatures);
return NULL;
}
int currentFeature = 0;
for (int img = 0; img < imgCount; img++) {
int features = numOfFeatures[img];
for (int feat = 0; feat < features; feat++) {
allFeatures[currentFeature++] = imagesFeatures[img][feat];
}
free(imagesFeatures[img]); //freeing only the pointers to the points array, not the points themselves
}
free(numOfFeatures);
free(imagesFeatures); //only pointer to matrix need to be freed - features themselves still being used later
return allFeatures;
}
int exportImageToFile(SPPoint* pointArray, int size, int image_index,
SPConfig config) {
declareLogMsg();
if(!pointArray || size<1 || image_index <0 || !config) {
InvalidError();
return ERR;
}
/** init **/
SP_CONFIG_MSG _conf_msg = SP_CONFIG_SUCCESS,
*conf_msg = &_conf_msg;
int rc = OK, i, j, dims;
char endChar, filepath[MAX_LENGTH] = { '\0' };
SPPoint curr;
/** Get file path **/
*conf_msg = spConfigGetImagePath(filepath, config, image_index);
returnIfConfigMsg(1)
/*** Change filepath to .feats ***/
char* ptr = filepath + strlen(filepath);
while (*ptr != '.' && ptr != filepath) {
*ptr = '\0';
ptr--;
}
if (ptr == filepath) {
printError(FEATS_SUFFIX);
}
sprintf(ptr, FEATS_EXT);
/** Open feats file **/
printDebug(DBG_CREATE);
FILE *output = fopen(filepath, WRITE_MODE);
if (!output) {
printError(FEATS_FILE)
return ERR;
}
/* Writes image index at 1st line,
* No. of points at the 2nd line*/
rc = fprintf(output, INTS_FEATS_FILE, image_index, size);
if (rc < ERR) {
printError(FEATS_PRNT)
fclose(output);
return ERR;
}
/*writes double array inside points*/
for (i = 0; i < size; i++) {
curr = pointArray[i];
dims = spPointGetDimension(curr);
for (j = 0; j < dims; j++) {
/** Last feature of last line **/
if ((j + 1) == dims && i == size - 1) {
rc = fprintf(output, FLOAT, spPointGetAxisCoor(curr, j));
} else {
/** Last feature of another line **/
if ((j + 1) == dims && i != size - 1) {
endChar = '\n';
} else {
/** Regular non-at-some-kind-of-end feature **/
endChar = ' ';
}
rc = fprintf(output, FLOAT_CHAR, spPointGetAxisCoor(curr, j),
endChar);
}
/** file write error **/
if (rc < ERR) {
printError(FEATS_PRNT)
fclose(output);
return ERR;
}
}
}
fclose(output);
return OK;
}