--- /dev/null
+++ src/renderer/jpeg_memsrc.h
@@ -0,0 +1,5 @@
+#include <stdio.h>
+#include <jpeglib.h>
+
+void jpeg_memory_src (j_decompress_ptr cinfo, const JOCTET * buffer,
+  size_t bufsize);
--- /dev/null
+++ src/renderer/jpeg_memsrc.c
@@ -0,0 +1,163 @@
+/*
+* memsrc.c
+*
+* Copyright (C) 1994-1996, Thomas G. Lane.
+* This file is part of the Independent JPEG Group's software.
+* For conditions of distribution and use, see the accompanying README file.
+*
+* This file contains decompression data source routines for the case of
+* reading JPEG data from a memory buffer that is preloaded with the entire
+* JPEG file. This would not seem especially useful at first sight, but
+* a number of people have asked for it.
+* This is really just a stripped-down version of jdatasrc.c. Comparison
+* of this code with jdatasrc.c may be helpful in seeing how to make
+* custom source managers for other purposes.
+*/
+
+/* this is not a core library module, so it doesn't define JPEG_INTERNALS */
+#include <stdio.h>
+#include <jpeglib.h>
+#include <jerror.h>
+
+
+/* Expanded data source object for memory input */
+
+typedef struct {
+struct jpeg_source_mgr pub; /* public fields */
+
+JOCTET eoi_buffer[2]; /* a place to put a dummy EOI */
+} my_source_mgr;
+
+typedef my_source_mgr * my_src_ptr;
+
+
+/*
+* Initialize source --- called by jpeg_read_header
+* before any data is actually read.
+*/
+
+METHODDEF(void)
+init_source (j_decompress_ptr cinfo)
+{
+/* No work, since jpeg_memory_src set up the buffer pointer and count.
+* Indeed, if we want to read multiple JPEG images from one buffer,
+* this *must* not do anything to the pointer.
+*/
+}
+
+
+/*
+* Fill the input buffer --- called whenever buffer is emptied.
+*
+* In this application, this routine should never be called; if it is called,
+* the decompressor has overrun the end of the input buffer, implying we
+* supplied an incomplete or corrupt JPEG datastream. A simple error exit
+* might be the most appropriate response.
+*
+* But what we choose to do in this code is to supply dummy EOI markers
+* in order to force the decompressor to finish processing and supply
+* some sort of output image, no matter how corrupted.
+*/
+
+METHODDEF(boolean)
+fill_input_buffer (j_decompress_ptr cinfo)
+{
+my_src_ptr src = (my_src_ptr) cinfo->src;
+
+WARNMS(cinfo, JWRN_JPEG_EOF);
+
+/* Create a fake EOI marker */
+src->eoi_buffer[0] = (JOCTET) 0xFF;
+src->eoi_buffer[1] = (JOCTET) JPEG_EOI;
+src->pub.next_input_byte = src->eoi_buffer;
+src->pub.bytes_in_buffer = 2;
+
+return TRUE;
+}
+
+
+/*
+* Skip data --- used to skip over a potentially large amount of
+* uninteresting data (such as an APPn marker).
+*
+* If we overrun the end of the buffer, we let fill_input_buffer deal with
+* it. An extremely large skip could cause some time-wasting here, but
+* it really isn't supposed to happen ... and the decompressor will never
+* skip more than 64K anyway.
+*/
+
+METHODDEF(void)
+skip_input_data (j_decompress_ptr cinfo, long num_bytes)
+{
+my_src_ptr src = (my_src_ptr) cinfo->src;
+
+if (num_bytes > 0) {
+while (num_bytes > (long) src->pub.bytes_in_buffer) {
+num_bytes -= (long) src->pub.bytes_in_buffer;
+(void) fill_input_buffer(cinfo);
+/* note we assume that fill_input_buffer will never return FALSE,
+* so suspension need not be handled.
+*/
+}
+src->pub.next_input_byte += (size_t) num_bytes;
+src->pub.bytes_in_buffer -= (size_t) num_bytes;
+}
+}
+
+
+/*
+* An additional method that can be provided by data source modules is the
+* resync_to_restart method for error recovery in the presence of RST markers.
+* For the moment, this source module just uses the default resync method
+* provided by the JPEG library. That method assumes that no backtracking
+* is possible.
+*/
+
+
+/*
+* Terminate source --- called by jpeg_finish_decompress
+* after all data has been read. Often a no-op.
+*
+* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
+* application must deal with any cleanup that should happen even
+* for error exit.
+*/
+
+METHODDEF(void)
+term_source (j_decompress_ptr cinfo)
+{
+/* no work necessary here */
+}
+
+
+/*
+* Prepare for input from a memory buffer.
+*/
+
+GLOBAL(void)
+jpeg_memory_src (j_decompress_ptr cinfo, const JOCTET * buffer, size_t bufsize)
+{
+my_src_ptr src;
+
+/* The source object is made permanent so that a series of JPEG images
+* can be read from a single buffer by calling jpeg_memory_src
+* only before the first one.
+* This makes it unsafe to use this manager and a different source
+* manager serially with the same JPEG object. Caveat programmer.
+*/
+if (cinfo->src == NULL) { /* first time for this JPEG object? */
+cinfo->src = (struct jpeg_source_mgr *)
+(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+sizeof(my_source_mgr));
+}
+
+src = (my_src_ptr) cinfo->src;
+src->pub.init_source = init_source;
+src->pub.fill_input_buffer = fill_input_buffer;
+src->pub.skip_input_data = skip_input_data;
+src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
+src->pub.term_source = term_source;
+
+src->pub.next_input_byte = buffer;
+src->pub.bytes_in_buffer = bufsize;
+}