RSA Security Projection Television 5.2.2 Instrukcja Użytkownika Pobierz pdf (Strona 195)

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Chapter 5 Non-Cryptographic Operations 173

Converting Data Between Binary and ASCII

Step 4: Update

Enter the data to encode through B_EncodeUpdate. The application is responsible for

allocating the space for the output of this routine. When encoding, for each three bytes

of input there are four bytes of output. So when allocating space, multiply the input

size by 4/3 and round up. If memory is not an issue, you can make the output buffer

twice the size of the input length.

Given pre-existing binary input, your calls to the Update functions would be as

follows:

if ((status = B_EncodeInit (asciiEncoder)) != 0)

break;

/* We are assuming binaryData already points to allocated

space and contains the data to encode into ASCII.

unsigned char *binaryData;

unsigned int binaryDataLen;

unsigned char *asciiEncoding = NULL_PTR;

unsigned int asciiEncodingLenUpdate;

/* Allocate a buffer twice the size of the binary data */

asciiEncoding = T_malloc (binaryDataLen * 2);

if ((status = (asciiEncoding == NULL_PTR)) != 0)

break;

if ((status = B_EncodeUpdate

(asciiEncoder, asciiEncoding, &asciiEncodingLenUpdate,

(binaryDataLen * 2), binaryData, binaryDataLen)) != 0)

break;

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