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SQLITE3_BLOB_READ(3)       Library Functions Manual       SQLITE3_BLOB_READ(3)

     sqlite3_blob_read - Read Data From A BLOB Incrementally

     sqlite3_blob_read(sqlite3_blob *, void *Z, int N, int iOffset);

     This function is used to read data from an open BLOB handle into a
     caller-supplied buffer.  N bytes of data are copied into buffer Z from
     the open BLOB, starting at offset iOffset.

     If offset iOffset is less than N bytes from the end of the BLOB,
     SQLITE_ERROR is returned and no data is read.  If N or iOffset is less
     than zero, SQLITE_ERROR is returned and no data is read.  The size of the
     blob (and hence the maximum value of N+iOffset) can be determined using
     the sqlite3_blob_bytes() interface.

     An attempt to read from an expired BLOB handle fails with an error code

     On success, sqlite3_blob_read() returns SQLITE_OK.  Otherwise, an error
     code or an extended error code is returned.

     This routine only works on a BLOB handle which has been created by a
     prior successful call to sqlite3_blob_open() and which has not been
     closed by sqlite3_blob_close().  Passing any other pointer in to this
     routine results in undefined and probably undesirable behavior.

     sqlite3_blob(3), sqlite3_blob_bytes(3), sqlite3_blob_close(3),
     sqlite3_blob_open(3), sqlite3_blob_write(3), SQLITE_OK(3)

NetBSD 8.0                      March 11, 2017                      NetBSD 8.0