mirror of
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192 lines
8.1 KiB
Plaintext
192 lines
8.1 KiB
Plaintext
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla FastLoad code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Brendan Eich <brendan@mozilla.org> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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#include "nsrootidl.idl"
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/**
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* An interface for access to a buffering stream implementation's underlying
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* memory buffer.
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*
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* Stream implementations that QueryInterface to nsIStreamBufferAccess must
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* ensure that all buffers are aligned on the most restrictive type size for
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* the current architecture (e.g., sizeof(double) for RISCy CPUs). malloc(3)
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* satisfies this requirement.
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*/
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[uuid(ac923b72-ac87-4892-ac7a-ca385d429435)]
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interface nsIStreamBufferAccess : nsISupports
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{
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/**
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* Get access to a contiguous, aligned run of bytes in the stream's buffer.
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* Exactly one successful getBuffer call must occur before a putBuffer call
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* taking the non-null pointer returned by the successful getBuffer.
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*
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* The run of bytes are the next bytes (modulo alignment padding) to read
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* for an input stream, and the next bytes (modulo alignment padding) to
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* store before (eventually) writing buffered data to an output stream.
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* There can be space beyond this run of bytes in the buffer for further
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* accesses before the fill or flush point is reached.
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*
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* @param aLength
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* Count of contiguous bytes requested at the address A that satisfies
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* (A & aAlignMask) == 0 in the buffer, starting from the current stream
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* position, mapped to a buffer address B. The stream implementation
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* must pad from B to A by skipping bytes (if input stream) or storing
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* zero bytes (if output stream).
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*
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* @param aAlignMask
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* Bit-mask computed by subtracting 1 from the power-of-two alignment
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* modulus (e.g., 3 or sizeof(PRUint32)-1 for PRUint32 alignment).
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*
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* @return
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* The aligned pointer to aLength bytes in the buffer, or null if the
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* buffer has no room for aLength bytes starting at the next address A
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* after the current position that satisfies (A & aAlignMask) == 0.
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*/
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[notxpcom] charPtr getBuffer(in PRUint32 aLength, in PRUint32 aAlignMask);
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/**
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* Relinquish access to the stream's buffer, filling if at end of an input
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* buffer, flushing if completing an output buffer. After a getBuffer call
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* that returns non-null, putBuffer must be called.
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*
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* @param aBuffer
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* A non-null pointer returned by getBuffer on the same stream buffer
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* access object.
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*
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* @param aLength
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* The same count of contiguous bytes passed to the getBuffer call that
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* returned aBuffer.
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*/
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[notxpcom] void putBuffer(in charPtr aBuffer, in PRUint32 aLength);
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/**
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* Disable and enable buffering on the stream implementing this interface.
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* DisableBuffering flushes an output stream's buffer, and invalidates an
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* input stream's buffer.
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*/
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void disableBuffering();
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void enableBuffering();
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/**
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* The underlying, unbuffered input or output stream.
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*/
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readonly attribute nsISupports unbufferedStream;
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};
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%{C++
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// Swap macros, used to convert to/from canonical (big-endian) format
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#if defined IS_LITTLE_ENDIAN
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# define NS_SWAP16(x) ((((x) & 0xff) << 8) | (((x) >> 8) & 0xff))
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# define NS_SWAP32(x) ((NS_SWAP16((x) & 0xffff) << 16) | (NS_SWAP16((x) >> 16)))
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// We want to avoid casting to 32-bit types if possible, since that violates
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// aliasing rules (a standard compiler may assume that pointers of two types
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// do not address overlapping storage).
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//
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// XXX What if we have a compiler that follows aliasing rules strictly but
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// doesn't have a 64-bit int type?
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//
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// XXXbe shouldn't NSPR's LL_INIT work for non-constant arguments in all cases?
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# if defined HAVE_LONG_LONG
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# if PR_BYTES_PER_LONG == 8
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# define ULL_(x) x ## UL
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# elif (defined WIN32 || defined WIN16) && !defined __GNUC__
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# define ULL_(x) ((uint64) x ## i64)
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# else
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# define ULL_(x) x ## ULL
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# endif
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# define NS_SWAP64(x) ((((x) & ULL_(0xff00000000000000)) >> 56) | \
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(((x) & ULL_(0x00ff000000000000)) >> 40) | \
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(((x) & ULL_(0x0000ff0000000000)) >> 24) | \
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(((x) & ULL_(0x000000ff00000000)) >> 8) | \
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(((x) & ULL_(0x00000000ff000000)) << 8) | \
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(((x) & ULL_(0x0000000000ff0000)) << 24) | \
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(((x) & ULL_(0x000000000000ff00)) << 40) | \
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(((x) /* & ULL_(0x00000000000000ff) */) << 56))
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# else
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# define NS_SWAP64(x) LL_INIT((((x).lo /* & 0xff000000ul */) >> 24) | \
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(((x).lo & 0x00ff0000ul) >> 8) | \
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(((x).lo & 0x0000ff00ul) << 8) | \
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(((x).lo /* & 0x000000fful */) << 24), \
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(((x).hi /* & 0xff000000ul */) >> 24) | \
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(((x).hi & 0x00ff0000ul) >> 8) | \
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(((x).hi & 0x0000ff00ul) << 8) | \
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(((x).hi /* & 0x000000fful */) << 24))
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# endif
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#elif defined IS_BIG_ENDIAN
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# define NS_SWAP16(x) (x)
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# define NS_SWAP32(x) (x)
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# define NS_SWAP64(x) (x)
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#else
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# error "Unknown byte order"
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#endif
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/**
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* These macros get and put a buffer given either an sba parameter that may
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* point to an object implementing nsIStreamBufferAccess, nsIObjectInputStream,
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* or nsIObjectOutputStream.
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*/
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#define NS_GET_BUFFER(sba,n,a) ((sba)->GetBuffer(n, a))
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#define NS_PUT_BUFFER(sba,p,n) ((sba)->PutBuffer(p, n))
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#define NS_GET8(p) (*(PRUint8*)(p))
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#define NS_GET16(p) NS_SWAP16(*(PRUint16*)(p))
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#define NS_GET32(p) NS_SWAP32(*(PRUint32*)(p))
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#define NS_GET64(p) NS_SWAP64(*(PRUint64*)(p))
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#define NS_GET_FLOAT(p) ((float)NS_SWAP32(*(PRUint32*)(p)))
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#define NS_GET_DOUBLE(p) ((double)NS_SWAP64(*(PRUint64*)(p)))
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#define NS_PUT8(p,x) (*(PRUint8*)(p) = (x))
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#define NS_PUT16(p,x) (*(PRUint16*)(p) = NS_SWAP16(x))
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#define NS_PUT32(p,x) (*(PRUint32*)(p) = NS_SWAP32(x))
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#define NS_PUT64(p,x) (*(PRUint64*)(p) = NS_SWAP64(x))
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#define NS_PUT_FLOAT(p,x) (*(PRUint32*)(p) = NS_SWAP32(*(PRUint32*)&(x)))
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#define NS_PUT_DOUBLE(p,x) (*(PRUint64*)(p) = NS_SWAP64(*(PRUint64*)&(x)))
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%}
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