зеркало из https://github.com/mozilla/gecko-dev.git
97 строки
3.8 KiB
Plaintext
97 строки
3.8 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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interface nsIUnicharInputStream;
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interface nsIInputStream;
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%{C++
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/**
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* The signature of the writer function passed to ReadSegments. This
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* is the "consumer" of data that gets read from the stream's buffer.
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*
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* @param aInStream stream being read
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* @param aClosure opaque parameter passed to ReadSegments
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* @param aFromSegment pointer to memory owned by the input stream
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* @param aToOffset amount already read (since ReadSegments was called)
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* @param aCount length of fromSegment
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* @param aWriteCount number of bytes read
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*
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* Implementers should return the following:
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*
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* @return NS_OK and (*aWriteCount > 0) if consumed some data
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* @return <any-error> if not interested in consuming any data
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*
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* Errors are never passed to the caller of ReadSegments.
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*
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* NOTE: returning NS_OK and (*aWriteCount = 0) has undefined behavior.
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*/
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typedef NS_CALLBACK(nsWriteUnicharSegmentFun)(nsIUnicharInputStream *aInStream,
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void *aClosure,
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const PRUnichar *aFromSegment,
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uint32_t aToOffset,
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uint32_t aCount,
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uint32_t *aWriteCount);
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%}
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native nsWriteUnicharSegmentFun(nsWriteUnicharSegmentFun);
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/**
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* Abstract unicode character input stream
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* @see nsIInputStream
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*/
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[scriptable, uuid(d5e3bd80-6723-4b92-b0c9-22f6162fd94f)]
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interface nsIUnicharInputStream : nsISupports {
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/**
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* Reads into a caller-provided character array.
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*
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* @return The number of characters that were successfully read. May be less
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* than aCount, even if there is more data in the input stream.
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* A return value of 0 means EOF.
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*
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* @note To read more than 2^32 characters, call this method multiple times.
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*/
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[noscript] unsigned long read([array, size_is(aCount)] in PRUnichar aBuf,
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in unsigned long aCount);
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/**
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* Low-level read method that has access to the stream's underlying buffer.
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* The writer function may be called multiple times for segmented buffers.
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* ReadSegments is expected to keep calling the writer until either there is
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* nothing left to read or the writer returns an error. ReadSegments should
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* not call the writer with zero characters to consume.
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*
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* @param aWriter the "consumer" of the data to be read
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* @param aClosure opaque parameter passed to writer
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* @param aCount the maximum number of characters to be read
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*
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* @return number of characters read (may be less than aCount)
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* @return 0 if reached end of file (or if aWriter refused to consume data)
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*
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* @throws NS_BASE_STREAM_WOULD_BLOCK if reading from the input stream would
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* block the calling thread (non-blocking mode only)
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* @throws <other-error> on failure
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*
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* NOTE: this function may be unimplemented if a stream has no underlying
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* buffer
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*/
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[noscript] unsigned long readSegments(in nsWriteUnicharSegmentFun aWriter,
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in voidPtr aClosure,
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in unsigned long aCount);
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/**
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* Read into a string object.
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* @param aCount The number of characters that should be read
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* @return The number of characters that were read.
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*/
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unsigned long readString(in unsigned long aCount, out AString aString);
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/**
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* Close the stream and free associated resources. This also closes the
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* underlying stream, if any.
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*/
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void close();
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};
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