1 files changed, 122 insertions, 0 deletions
diff --git a/src/jpeg-6/jdtrans.c b/src/jpeg-6/jdtrans.c
new file mode 100644
index 00000000..5c14adc6
--- /dev/null
+++ b/src/jpeg-6/jdtrans.c
@@ -0,0 +1,122 @@
+/*
+ * jdtrans.c
+ *
+ * Copyright (C) 1995, 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 library routines for transcoding decompression,
+ * that is, reading raw DCT coefficient arrays from an input JPEG file.
+ * The routines in jdapimin.c will also be needed by a transcoder.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/* Forward declarations */
+LOCAL void transdecode_master_selection JPP((j_decompress_ptr cinfo));
+
+
+/*
+ * Read the coefficient arrays from a JPEG file.
+ * jpeg_read_header must be completed before calling this.
+ *
+ * The entire image is read into a set of virtual coefficient-block arrays,
+ * one per component.  The return value is a pointer to the array of
+ * virtual-array descriptors.  These can be manipulated directly via the
+ * JPEG memory manager, or handed off to jpeg_write_coefficients().
+ * To release the memory occupied by the virtual arrays, call
+ * jpeg_finish_decompress() when done with the data.
+ *
+ * Returns NULL if suspended.  This case need be checked only if
+ * a suspending data source is used.
+ */
+
+GLOBAL jvirt_barray_ptr *
+jpeg_read_coefficients (j_decompress_ptr cinfo)
+{
+  if (cinfo->global_state == DSTATE_READY) {
+    /* First call: initialize active modules */
+    transdecode_master_selection(cinfo);
+    cinfo->global_state = DSTATE_RDCOEFS;
+  } else if (cinfo->global_state != DSTATE_RDCOEFS)
+    ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+  /* Absorb whole file into the coef buffer */
+  for (;;) {
+    int retcode;
+    /* Call progress monitor hook if present */
+    if (cinfo->progress != NULL)
+      (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
+    /* Absorb some more input */
+    retcode = (*cinfo->inputctl->consume_input) (cinfo);
+    if (retcode == JPEG_SUSPENDED)
+      return NULL;
+    if (retcode == JPEG_REACHED_EOI)
+      break;
+    /* Advance progress counter if appropriate */
+    if (cinfo->progress != NULL &&
+	(retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) {
+      if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) {
+	/* startup underestimated number of scans; ratchet up one scan */
+	cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows;
+      }
+    }
+  }
+  /* Set state so that jpeg_finish_decompress does the right thing */
+  cinfo->global_state = DSTATE_STOPPING;
+  return cinfo->coef->coef_arrays;
+}
+
+
+/*
+ * Master selection of decompression modules for transcoding.
+ * This substitutes for jdmaster.c's initialization of the full decompressor.
+ */
+
+LOCAL void
+transdecode_master_selection (j_decompress_ptr cinfo)
+{
+  /* Entropy decoding: either Huffman or arithmetic coding. */
+  if (cinfo->arith_code) {
+    ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
+  } else {
+    if (cinfo->progressive_mode) {
+#ifdef D_PROGRESSIVE_SUPPORTED
+      jinit_phuff_decoder(cinfo);
+#else
+      ERREXIT(cinfo, JERR_NOT_COMPILED);
+#endif
+    } else
+      jinit_huff_decoder(cinfo);
+  }
+
+  /* Always get a full-image coefficient buffer. */
+  jinit_d_coef_controller(cinfo, TRUE);
+
+  /* We can now tell the memory manager to allocate virtual arrays. */
+  (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
+
+  /* Initialize input side of decompressor to consume first scan. */
+  (*cinfo->inputctl->start_input_pass) (cinfo);
+
+  /* Initialize progress monitoring. */
+  if (cinfo->progress != NULL) {
+    int nscans;
+    /* Estimate number of scans to set pass_limit. */
+    if (cinfo->progressive_mode) {
+      /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */
+      nscans = 2 + 3 * cinfo->num_components;
+    } else if (cinfo->inputctl->has_multiple_scans) {
+      /* For a nonprogressive multiscan file, estimate 1 scan per component. */
+      nscans = cinfo->num_components;
+    } else {
+      nscans = 1;
+    }
+    cinfo->progress->pass_counter = 0L;
+    cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans;
+    cinfo->progress->completed_passes = 0;
+    cinfo->progress->total_passes = 1;
+  }
+}