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[68.56.149.176]) by smtp.gmail.com with ESMTPSA id dy20-20020ad44e94000000b0067a14f54f8asm110601qvb.50.2023.11.23.15.45.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Nov 2023 15:45:45 -0800 (PST) From: Leo Izen To: ffmpeg-devel@ffmpeg.org Date: Thu, 23 Nov 2023 18:45:41 -0500 Message-ID: <20231123234541.41316-3-leo.izen@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231123234541.41316-1-leo.izen@gmail.com> References: <20231123234541.41316-1-leo.izen@gmail.com> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH 2/2] avcodec/jpegxl_parser: fix parsing sequences of extremely small files X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: Leo Izen Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: A14rQZUzNqyN This patch allows the JXL parser to parse sequences of extremely small files concatenated together. (e.g. smaller than the parser buffer) Signed-off-by: Leo Izen --- libavcodec/jpegxl_parser.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/libavcodec/jpegxl_parser.c b/libavcodec/jpegxl_parser.c index 750872f17f..006eb6b295 100644 --- a/libavcodec/jpegxl_parser.c +++ b/libavcodec/jpegxl_parser.c @@ -1454,15 +1454,21 @@ static int jpegxl_parse(AVCodecParserContext *s, AVCodecContext *avctx, { JXLParseContext *ctx = s->priv_data; int next = END_NOT_FOUND, ret; + const uint8_t *pbuf = ctx->pc.buffer; + int pindex = ctx->pc.index; *poutbuf_size = 0; *poutbuf = NULL; - if (!ctx->pc.index) - goto flush; + if (!ctx->pc.index) { + if (ctx->pc.overread) + goto flush; + pbuf = buf; + pindex = buf_size; + } if ((!ctx->container || !ctx->codestream_length) && !ctx->next) { - ret = try_parse(s, avctx, ctx, ctx->pc.buffer, ctx->pc.index); + ret = try_parse(s, avctx, ctx, pbuf, pindex); if (ret < 0) goto flush; ctx->next = ret; @@ -1471,7 +1477,7 @@ static int jpegxl_parse(AVCodecParserContext *s, AVCodecContext *avctx, } if (ctx->container && ctx->next >= 0) { - ret = skip_boxes(ctx, ctx->pc.buffer, ctx->pc.index); + ret = skip_boxes(ctx, pbuf, pindex); if (ret < 0) { if (ret == AVERROR_INVALIDDATA) ctx->next = -1;