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authorBenjamin Peterson <benjamin@python.org>2008-09-03 22:30:12 (GMT)
committerBenjamin Peterson <benjamin@python.org>2008-09-03 22:30:12 (GMT)
commitb98eb875dc4d23cdbf56e080a31de0881d2b6965 (patch)
tree2dcc04afc7c0919fd47297d7d13f33f60b79e9f1 /Lib/bsddb/dbrecio.py
parentdcc1e117604cc64dfa03a703391fbaeba654181a (diff)
downloadcpython-b98eb875dc4d23cdbf56e080a31de0881d2b6965.zip
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remove bsddb
Diffstat (limited to 'Lib/bsddb/dbrecio.py')
-rw-r--r--Lib/bsddb/dbrecio.py190
1 files changed, 0 insertions, 190 deletions
diff --git a/Lib/bsddb/dbrecio.py b/Lib/bsddb/dbrecio.py
deleted file mode 100644
index 932ce2e..0000000
--- a/Lib/bsddb/dbrecio.py
+++ /dev/null
@@ -1,190 +0,0 @@
-
-"""
-File-like objects that read from or write to a bsddb record.
-
-This implements (nearly) all stdio methods.
-
-f = DBRecIO(db, key, txn=None)
-f.close() # explicitly release resources held
-flag = f.isatty() # always false
-pos = f.tell() # get current position
-f.seek(pos) # set current position
-f.seek(pos, mode) # mode 0: absolute; 1: relative; 2: relative to EOF
-buf = f.read() # read until EOF
-buf = f.read(n) # read up to n bytes
-f.truncate([size]) # truncate file at to at most size (default: current pos)
-f.write(buf) # write at current position
-f.writelines(list) # for line in list: f.write(line)
-
-Notes:
-- fileno() is left unimplemented so that code which uses it triggers
- an exception early.
-- There's a simple test set (see end of this file) - not yet updated
- for DBRecIO.
-- readline() is not implemented yet.
-
-
-From:
- Itamar Shtull-Trauring <itamar@maxnm.com>
-"""
-
-import errno
-import string
-
-class DBRecIO:
- def __init__(self, db, key, txn=None):
- self.db = db
- self.key = key
- self.txn = txn
- self.len = None
- self.pos = 0
- self.closed = 0
- self.softspace = 0
-
- def close(self):
- if not self.closed:
- self.closed = 1
- del self.db, self.txn
-
- def isatty(self):
- if self.closed:
- raise ValueError("I/O operation on closed file")
- return 0
-
- def seek(self, pos, mode = 0):
- if self.closed:
- raise ValueError("I/O operation on closed file")
- if mode == 1:
- pos = pos + self.pos
- elif mode == 2:
- pos = pos + self.len
- self.pos = max(0, pos)
-
- def tell(self):
- if self.closed:
- raise ValueError("I/O operation on closed file")
- return self.pos
-
- def read(self, n = -1):
- if self.closed:
- raise ValueError("I/O operation on closed file")
- if n < 0:
- newpos = self.len
- else:
- newpos = min(self.pos+n, self.len)
-
- dlen = newpos - self.pos
-
- r = self.db.get(self.key, txn=self.txn, dlen=dlen, doff=self.pos)
- self.pos = newpos
- return r
-
- __fixme = """
- def readline(self, length=None):
- if self.closed:
- raise ValueError, "I/O operation on closed file"
- if self.buflist:
- self.buf = self.buf + string.joinfields(self.buflist, '')
- self.buflist = []
- i = string.find(self.buf, '\n', self.pos)
- if i < 0:
- newpos = self.len
- else:
- newpos = i+1
- if length is not None:
- if self.pos + length < newpos:
- newpos = self.pos + length
- r = self.buf[self.pos:newpos]
- self.pos = newpos
- return r
-
- def readlines(self, sizehint = 0):
- total = 0
- lines = []
- line = self.readline()
- while line:
- lines.append(line)
- total += len(line)
- if 0 < sizehint <= total:
- break
- line = self.readline()
- return lines
- """
-
- def truncate(self, size=None):
- if self.closed:
- raise ValueError("I/O operation on closed file")
- if size is None:
- size = self.pos
- elif size < 0:
- raise IOError(errno.EINVAL,
- "Negative size not allowed")
- elif size < self.pos:
- self.pos = size
- self.db.put(self.key, "", txn=self.txn, dlen=self.len-size, doff=size)
-
- def write(self, s):
- if self.closed:
- raise ValueError("I/O operation on closed file")
- if not s: return
- if self.pos > self.len:
- self.buflist.append('\0'*(self.pos - self.len))
- self.len = self.pos
- newpos = self.pos + len(s)
- self.db.put(self.key, s, txn=self.txn, dlen=len(s), doff=self.pos)
- self.pos = newpos
-
- def writelines(self, list):
- self.write(string.joinfields(list, ''))
-
- def flush(self):
- if self.closed:
- raise ValueError("I/O operation on closed file")
-
-
-"""
-# A little test suite
-
-def _test():
- import sys
- if sys.argv[1:]:
- file = sys.argv[1]
- else:
- file = '/etc/passwd'
- lines = open(file, 'r').readlines()
- text = open(file, 'r').read()
- f = StringIO()
- for line in lines[:-2]:
- f.write(line)
- f.writelines(lines[-2:])
- if f.getvalue() != text:
- raise RuntimeError, 'write failed'
- length = f.tell()
- print 'File length =', length
- f.seek(len(lines[0]))
- f.write(lines[1])
- f.seek(0)
- print 'First line =', repr(f.readline())
- here = f.tell()
- line = f.readline()
- print 'Second line =', repr(line)
- f.seek(-len(line), 1)
- line2 = f.read(len(line))
- if line != line2:
- raise RuntimeError, 'bad result after seek back'
- f.seek(len(line2), 1)
- list = f.readlines()
- line = list[-1]
- f.seek(f.tell() - len(line))
- line2 = f.read()
- if line != line2:
- raise RuntimeError, 'bad result after seek back from EOF'
- print 'Read', len(list), 'more lines'
- print 'File length =', f.tell()
- if f.tell() != length:
- raise RuntimeError, 'bad length'
- f.close()
-
-if __name__ == '__main__':
- _test()
-"""