--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/include/mupdf/fitz/buffer.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,250 @@
+// Copyright (C) 2004-2023 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.
+
+#ifndef MUPDF_FITZ_BUFFER_H
+#define MUPDF_FITZ_BUFFER_H
+
+#include "mupdf/fitz/system.h"
+#include "mupdf/fitz/context.h"
+
+/**
+	fz_buffer is a wrapper around a dynamically allocated array of
+	bytes.
+
+	Buffers have a capacity (the number of bytes storage immediately
+	available) and a current size.
+
+	The contents of the structure are considered implementation
+	details and are subject to change. Users should use the accessor
+	functions in preference.
+*/
+typedef struct
+{
+	int refs;
+	unsigned char *data;
+	size_t cap, len;
+	int unused_bits;
+	int shared;
+} fz_buffer;
+
+/**
+	Take an additional reference to the buffer. The same pointer
+	is returned.
+
+	Never throws exceptions.
+*/
+fz_buffer *fz_keep_buffer(fz_context *ctx, fz_buffer *buf);
+
+/**
+	Drop a reference to the buffer. When the reference count reaches
+	zero, the buffer is destroyed.
+
+	Never throws exceptions.
+*/
+void fz_drop_buffer(fz_context *ctx, fz_buffer *buf);
+
+/**
+	Retrieve internal memory of buffer.
+
+	datap: Output parameter that will be pointed to the data.
+
+	Returns the current size of the data in bytes.
+*/
+size_t fz_buffer_storage(fz_context *ctx, fz_buffer *buf, unsigned char **datap);
+
+/**
+	Ensure that a buffer's data ends in a
+	0 byte, and return a pointer to it.
+*/
+const char *fz_string_from_buffer(fz_context *ctx, fz_buffer *buf);
+
+fz_buffer *fz_new_buffer(fz_context *ctx, size_t capacity);
+
+/**
+	Create a new buffer with existing data.
+
+	data: Pointer to existing data.
+	size: Size of existing data.
+
+	Takes ownership of data. Does not make a copy. Calls fz_free on
+	the data when the buffer is deallocated. Do not use 'data' after
+	passing to this function.
+
+	Returns pointer to new buffer. Throws exception on allocation
+	failure.
+*/
+fz_buffer *fz_new_buffer_from_data(fz_context *ctx, unsigned char *data, size_t size);
+
+/**
+	Like fz_new_buffer, but does not take ownership.
+*/
+fz_buffer *fz_new_buffer_from_shared_data(fz_context *ctx, const unsigned char *data, size_t size);
+
+/**
+	Create a new buffer containing a copy of the passed data.
+*/
+fz_buffer *fz_new_buffer_from_copied_data(fz_context *ctx, const unsigned char *data, size_t size);
+
+/**
+	Make a new buffer, containing a copy of the data used in
+	the original.
+*/
+fz_buffer *fz_clone_buffer(fz_context *ctx, fz_buffer *buf);
+
+/**
+	Create a new buffer with data decoded from a base64 input string.
+*/
+fz_buffer *fz_new_buffer_from_base64(fz_context *ctx, const char *data, size_t size);
+
+/**
+	Ensure that a buffer has a given capacity,
+	truncating data if required.
+
+	capacity: The desired capacity for the buffer. If the current
+	size of the buffer contents is smaller than capacity, it is
+	truncated.
+*/
+void fz_resize_buffer(fz_context *ctx, fz_buffer *buf, size_t capacity);
+
+/**
+	Make some space within a buffer (i.e. ensure that
+	capacity > size).
+*/
+void fz_grow_buffer(fz_context *ctx, fz_buffer *buf);
+
+/**
+	Trim wasted capacity from a buffer by resizing internal memory.
+*/
+void fz_trim_buffer(fz_context *ctx, fz_buffer *buf);
+
+/**
+	Empties the buffer. Storage is not freed, but is held ready
+	to be reused as the buffer is refilled.
+
+	Never throws exceptions.
+*/
+void fz_clear_buffer(fz_context *ctx, fz_buffer *buf);
+
+/**
+	Create a new buffer with a (subset of) the data from the buffer.
+
+	start: if >= 0, offset from start of buffer, if < 0 offset from end of buffer.
+
+	end: if >= 0, offset from start of buffer, if < 0 offset from end of buffer.
+
+*/
+fz_buffer *fz_slice_buffer(fz_context *ctx, fz_buffer *buf, int64_t start, int64_t end);
+
+/**
+	Append the contents of the source buffer onto the end of the
+	destination buffer, extending automatically as required.
+
+	Ownership of buffers does not change.
+*/
+void fz_append_buffer(fz_context *ctx, fz_buffer *destination, fz_buffer *source);
+
+/**
+	Write a base64 encoded data block, optionally with periodic newlines.
+*/
+void fz_append_base64(fz_context *ctx, fz_buffer *out, const unsigned char *data, size_t size, int newline);
+
+/**
+	Append a base64 encoded fz_buffer, optionally with periodic newlines.
+*/
+void fz_append_base64_buffer(fz_context *ctx, fz_buffer *out, fz_buffer *data, int newline);
+
+/**
+	fz_append_*: Append data to a buffer.
+
+	The buffer will automatically grow as required.
+*/
+void fz_append_data(fz_context *ctx, fz_buffer *buf, const void *data, size_t len);
+void fz_append_string(fz_context *ctx, fz_buffer *buf, const char *data);
+void fz_append_byte(fz_context *ctx, fz_buffer *buf, int c);
+void fz_append_rune(fz_context *ctx, fz_buffer *buf, int c);
+void fz_append_int32_le(fz_context *ctx, fz_buffer *buf, int x);
+void fz_append_int16_le(fz_context *ctx, fz_buffer *buf, int x);
+void fz_append_int32_be(fz_context *ctx, fz_buffer *buf, int x);
+void fz_append_int16_be(fz_context *ctx, fz_buffer *buf, int x);
+void fz_append_bits(fz_context *ctx, fz_buffer *buf, int value, int count);
+void fz_append_bits_pad(fz_context *ctx, fz_buffer *buf);
+
+/**
+	fz_append_pdf_string: Append a string with PDF syntax quotes and
+	escapes.
+
+	The buffer will automatically grow as required.
+*/
+void fz_append_pdf_string(fz_context *ctx, fz_buffer *buffer, const char *text);
+
+/**
+	fz_append_printf: Format and append data to buffer using
+	printf-like formatting (see fz_vsnprintf).
+
+	The buffer will automatically grow as required.
+*/
+void fz_append_printf(fz_context *ctx, fz_buffer *buffer, const char *fmt, ...);
+
+/**
+	fz_append_vprintf: Format and append data to buffer using
+	printf-like formatting with varargs (see fz_vsnprintf).
+*/
+void fz_append_vprintf(fz_context *ctx, fz_buffer *buffer, const char *fmt, va_list args);
+
+/**
+	Zero-terminate buffer in order to use as a C string.
+
+	This byte is invisible and does not affect the length of the
+	buffer as returned by fz_buffer_storage. The zero byte is
+	written *after* the data, and subsequent writes will overwrite
+	the terminating byte.
+
+	Subsequent changes to the size of the buffer (such as by
+	fz_buffer_trim, fz_buffer_grow, fz_resize_buffer, etc) may
+	invalidate this.
+*/
+void fz_terminate_buffer(fz_context *ctx, fz_buffer *buf);
+
+/**
+	Create an MD5 digest from buffer contents.
+
+	Never throws exceptions.
+*/
+void fz_md5_buffer(fz_context *ctx, fz_buffer *buffer, unsigned char digest[16]);
+
+/**
+	Take ownership of buffer contents.
+
+	Performs the same task as fz_buffer_storage, but ownership of
+	the data buffer returns with this call. The buffer is left
+	empty.
+
+	Note: Bad things may happen if this is called on a buffer with
+	multiple references that is being used from multiple threads.
+
+	data: Pointer to place to retrieve data pointer.
+
+	Returns length of stream.
+*/
+size_t fz_buffer_extract(fz_context *ctx, fz_buffer *buf, unsigned char **data);
+
+#endif