Acrobat Digital Signature API Reference - Adobe Partners

PubSec Methods
General PubSec Methods
2
PSDataBufferEnum
ASBool PSDataBufferEnum (PSDataBuffer dataBuffer,
ASInt32 maxSize, ASUns8 **pReturnBuffer,
ASInt32 *pReturnSize);
Description
Gets bytes of data to digest when signing or verifying, in chunks of a specified size.
Continues getting data chunks until all of the data in the data buffer has been returned.
A handler will use this call when computing its own data digest, to get the next blob of
bytes to digest. The dataBuffer object keeps track of the bytes that have been returned,
of how many bytes remain to be returned, and of the byte ranges of data to be provided.
When signing or verifying a PDDoc, the data buffer object is a PDDoc handle and the bytes
returned will be those defined by /ByteRange in the signature object dictionary. See the PDF
Reference for details.
The PSDataBufferDigest uses this method when computing the digest for the data.
Parameters
dataBuffer
maxSize
pReturnBuffer
pReturnSize
The buffer containing the data.
The maximum number of bytes to return in the return buffer.
(Filled by the method) A pointer to the buffer containing the
current bytes to be processed. If NULL, an error occurred and you
should abort the enumeration.
(Filled by the method) A pointer to the size in bytes of the return
buffer. When 0, do not process the return buffer, but continue
enumerating until the method returns false. Always less than
maxSize.
Return Value
true as long as there is more data to process, false when the end of the buffer is
reached.
Header File
PubSecHFT.h
Related Methods
PSDataBufferDigest
Acrobat Digital Signature API Reference 27