--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/source/fitz/brotli.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,139 @@
+// Copyright (C) 2004-2025 Artifex Software, Inc.
+//
+// This file is part of MuPDF.
+//
+// MuPDF is free software: you can redistribute it and/or modify it under the
+// terms of the GNU Affero General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+//
+// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
+//
+// Alternative licensing terms are available from the licensor.
+// For commercial licensing, see <https://www.artifex.com/> or contact
+// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
+// CA 94129, USA, for further information.
+
+#include "mupdf/fitz.h"
+
+#if FZ_ENABLE_BROTLI
+
+#include "brotli/encode.h"
+
+#include <limits.h>
+
+static void *
+my_brotli_alloc(void *opaque, size_t size)
+{
+	return fz_malloc_no_throw((fz_context *)opaque, size);
+}
+
+static void
+my_brotli_free(void *opaque, void *ptr)
+{
+	fz_free((fz_context *)opaque, ptr);
+}
+
+void fz_compress_brotli(fz_context *ctx, unsigned char *dest, size_t *dest_len, const unsigned char *source, size_t source_len, fz_brotli_level level)
+{
+	int ok;
+	BrotliEncoderState *enc_state;
+	unsigned char *outp = dest;
+	size_t avail_out = *dest_len;
+
+	enc_state = BrotliEncoderCreateInstance(my_brotli_alloc, my_brotli_free, ctx);
+
+	if (!BrotliEncoderSetParameter(enc_state, BROTLI_PARAM_QUALITY, level))
+	{
+		BrotliEncoderDestroyInstance(enc_state);
+		fz_throw(ctx, FZ_ERROR_LIBRARY, "Brotli compression failed");
+	}
+
+	do {
+		ok = BrotliEncoderCompressStream(enc_state,
+						(source_len > 0 ? BROTLI_OPERATION_PROCESS : BROTLI_OPERATION_FINISH),
+						&source_len,
+						&source,
+						&avail_out,
+						&outp,
+						NULL);
+	} while (ok && !BrotliEncoderIsFinished(enc_state));
+
+	if (!ok)
+	{
+		BrotliEncoderDestroyInstance(enc_state);
+		fz_throw(ctx, FZ_ERROR_LIBRARY, "Brotli compression failed");
+	}
+	*dest_len = outp - dest;
+
+	BrotliEncoderDestroyInstance(enc_state);
+}
+
+unsigned char *fz_new_brotli_data(fz_context *ctx, size_t *compressed_length, const unsigned char *source, size_t source_length, fz_brotli_level level)
+{
+	size_t bound = fz_brotli_bound(ctx, source_length);
+	unsigned char *cdata = Memento_label(fz_malloc(ctx, bound), "brotli_data");
+	*compressed_length = 0;
+
+	fz_try(ctx)
+		fz_compress_brotli(ctx, cdata, &bound, source, source_length, level);
+	fz_catch(ctx)
+	{
+		fz_free(ctx, cdata);
+		fz_rethrow(ctx);
+	}
+
+	*compressed_length = bound;
+	return cdata;
+}
+
+unsigned char *fz_new_brotli_data_from_buffer(fz_context *ctx, size_t *compressed_length, fz_buffer *buffer, fz_brotli_level level)
+{
+	unsigned char *data;
+	size_t size = fz_buffer_storage(ctx, buffer, &data);
+
+	if (size == 0 || data == NULL)
+	{
+		*compressed_length = 0;
+		return NULL;
+	}
+
+	return fz_new_brotli_data(ctx, compressed_length, data, size, level);
+}
+
+size_t fz_brotli_bound(fz_context *ctx, size_t size)
+{
+	return BrotliEncoderMaxCompressedSize(size);
+}
+
+#else
+
+size_t fz_brotli_bound(fz_context *ctx, size_t size)
+{
+	return size;
+}
+
+void fz_compress_brotli(fz_context *ctx, unsigned char *dest, size_t *dest_len, const unsigned char *source, size_t source_len, fz_brotli_level level)
+{
+	fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "brotli compression not enabled");
+}
+
+unsigned char *fz_new_brotli_data_from_buffer(fz_context *ctx, size_t *compressed_length, fz_buffer *buffer, fz_brotli_level level)
+{
+	fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "brotli compression not enabled");
+	return NULL;
+}
+
+unsigned char *fz_new_brotli_data(fz_context *ctx, size_t *compressed_length, const unsigned char *source, size_t source_length, fz_brotli_level level)
+{
+	fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "brotli compression not enabled");
+	return NULL;
+}
+
+#endif