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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
commit | 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch) | |
tree | a31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /xpcom/io/nsIUnicharInputStream.idl | |
parent | Initial commit. (diff) | |
download | firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip |
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'xpcom/io/nsIUnicharInputStream.idl')
-rw-r--r-- | xpcom/io/nsIUnicharInputStream.idl | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/xpcom/io/nsIUnicharInputStream.idl b/xpcom/io/nsIUnicharInputStream.idl new file mode 100644 index 0000000000..3ae467cc83 --- /dev/null +++ b/xpcom/io/nsIUnicharInputStream.idl @@ -0,0 +1,97 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "nsISupports.idl" + +interface nsIUnicharInputStream; +interface nsIInputStream; + +%{C++ +/** + * The signature of the writer function passed to ReadSegments. This + * is the "consumer" of data that gets read from the stream's buffer. + * + * @param aInStream stream being read + * @param aClosure opaque parameter passed to ReadSegments + * @param aFromSegment pointer to memory owned by the input stream + * @param aToOffset number of UTF-16 code units already read + * (since ReadSegments was called) + * @param aCount length of fromSegment + * @param aWriteCount number of UTF-16 code units read + * + * Implementers should return the following: + * + * @throws <any-error> if not interested in consuming any data + * + * Errors are never passed to the caller of ReadSegments. + * + * NOTE: returning NS_OK and (*aWriteCount = 0) has undefined behavior. + */ +typedef nsresult (*nsWriteUnicharSegmentFun)(nsIUnicharInputStream *aInStream, + void *aClosure, + const char16_t *aFromSegment, + uint32_t aToOffset, + uint32_t aCount, + uint32_t *aWriteCount); +%} +native nsWriteUnicharSegmentFun(nsWriteUnicharSegmentFun); + +/** + * Abstract UTF-16 input stream + * @see nsIInputStream + */ +[scriptable, uuid(d5e3bd80-6723-4b92-b0c9-22f6162fd94f)] +interface nsIUnicharInputStream : nsISupports { + /** + * Reads into a caller-provided array. + * + * @return The number of utf-16 code units that were successfully read. + * May be less than aCount, even if there is more data in the input + * stream. A return value of 0 means EOF. + * + * @note To read more than 2^32 code units, call this method multiple times. + */ + [noscript] unsigned long read([array, size_is(aCount)] in char16_t aBuf, + in unsigned long aCount); + + /** + * Low-level read method that has access to the stream's underlying buffer. + * The writer function may be called multiple times for segmented buffers. + * ReadSegments is expected to keep calling the writer until either there is + * nothing left to read or the writer returns an error. ReadSegments should + * not call the writer with zero UTF-16 code units to consume. + * + * @param aWriter the "consumer" of the data to be read + * @param aClosure opaque parameter passed to writer + * @param aCount the maximum number of UTF-16 code units to be read + * + * @return number of UTF-16 code units read (may be less than aCount) + * @return 0 if reached end of file (or if aWriter refused to consume data) + * + * @throws NS_BASE_STREAM_WOULD_BLOCK if reading from the input stream would + * block the calling thread (non-blocking mode only) + * @throws <other-error> on failure + * + * NOTE: this function may be unimplemented if a stream has no underlying + * buffer + */ + [noscript] unsigned long readSegments(in nsWriteUnicharSegmentFun aWriter, + in voidPtr aClosure, + in unsigned long aCount); + + /** + * Read into a string object. + * + * @param aCount The number of UTF-16 code units that should be read + * @return The number of UTF-16 code units that were read. + */ + unsigned long readString(in unsigned long aCount, out AString aString); + + /** + * Close the stream and free associated resources. This also closes the + * underlying stream, if any. + */ + void close(); +}; |