+Unity Runtime codeHEADmaster

1 files changed, 174 insertions, 0 deletions

diff --git a/Runtime/Export/JPEGMemsrc.c b/Runtime/Export/JPEGMemsrc.c
new file mode 100644
index 0000000..fcab486
--- /dev/null
+++ b/Runtime/Export/JPEGMemsrc.c
@@ -0,0 +1,174 @@
+/*
+ * ... this file ought really to have been a part of jpeglib to begin with.
+ *
+ * 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 "External/ProphecySDK/src/extlib/jpglib/jinclude.h"
+#include "External/ProphecySDK/src/extlib/jpglib/jpeglib.h"
+#include "External/ProphecySDK/src/extlib/jpglib/jerror.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* 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(int)
+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, JOCTET * buffer, size_t bufsize);
+
+GLOBAL(void)
+jpeg_memory_src (j_decompress_ptr cinfo, 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;
+}
+
+#ifdef __cplusplus
+}
+#endif