PDFUtils.getBitsFromNum

All Samples(4) | Call(2) | Derive(0) | Import(2)

Makes the conversion between number and bits

@param num: Number to be converted
@param bitsPerComponent: Number of bits needed to represent a component
@return: A tuple (status,statusContent), where statusContent is the string containing the resulting bits in case status = 0 or an error in case status = -1

Show Implementation

        def getBitsFromNum(num, bitsPerComponent = 8):
    '''
        Makes the conversion between number and bits
        
        @param num: Number to be converted
        @param bitsPerComponent: Number of bits needed to represent a component
        @return: A tuple (status,statusContent), where statusContent is the string containing the resulting bits in case status = 0 or an error in case status = -1
    '''
    if not isinstance(num,int):
        return (-1,'num must be an integer')
    if not isinstance(bitsPerComponent,int):
        return (-1,'bitsPerComponent must be an integer')
    try:
        bitsRepresentation = bin(num)
        bitsRepresentation = bitsRepresentation.replace('0b','')
        mod = len(bitsRepresentation) % 8
        if mod != 0:
            bitsRepresentation = '0'*(8-mod) + bitsRepresentation
        bitsRepresentation = bitsRepresentation[-1*bitsPerComponent:]
    except:
        return (-1,'Error in conversion from number to bits')
    return (0,bitsRepresentation)

src/t/h/thug-HEAD/src/peepdf/PDFFilters.py thug(Download)

 
import sys, zlib, lzw, struct
from PDFUtils import getNumsFromBytes, getBytesFromBits, getBitsFromNum
from ccitt import CCITTFax

					diffPixel = colorNums[i+j]
					pixel[j] = (pixel[j] + diffPixel) & bitmask
					ret, outputBits = getBitsFromNum(pixel[j],bits)
					if ret == -1:
						return (ret,outputBits)

src/c/l/classyPDF-HEAD/peepdf_classy/PDFFilters.py classyPDF(Download)

 
import sys, zlib, lzw, struct
from PDFUtils import getNumsFromBytes, getBytesFromBits, getBitsFromNum
 
def decodeStream(stream, filter, parameters = {}):

					diffPixel = colorNums[i+j]
					pixel[j] = (pixel[j] + diffPixel) & bitmask
					ret, outputBits = getBitsFromNum(pixel[j],bits)
					if ret == -1:
						return (ret,outputBits)