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+/*
+ * jdtrans.c
+ *
+ * Copyright (C) 1995-1997, Thomas G. Lane.
+ * Modified 2000-2009 by Guido Vollbeding.
+ * 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.
+ *
+ * An alternative usage is to simply obtain access to the coefficient arrays
+ * during a buffered-image-mode decompression operation. This is allowed
+ * after any jpeg_finish_output() call. The arrays can be accessed until
+ * jpeg_finish_decompress() is called. (Note that any call to the library
+ * may reposition the arrays, so don't rely on access_virt_barray() results
+ * to stay valid across library calls.)
+ *
+ * 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;
+ }
+ if (cinfo->global_state == DSTATE_RDCOEFS) {
+ /* 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;
+ }
+ /* At this point we should be in state DSTATE_STOPPING if being used
+ * standalone, or in state DSTATE_BUFIMAGE if being invoked to get access
+ * to the coefficients during a full buffered-image-mode decompression.
+ */
+ if ((cinfo->global_state == DSTATE_STOPPING ||
+ cinfo->global_state == DSTATE_BUFIMAGE) && cinfo->buffered_image) {
+ return cinfo->coef->coef_arrays;
+ }
+ /* Oops, improper usage */
+ ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
+ return NULL; /* keep compiler happy */
+}
+
+
+/*
+ * 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)
+{
+ /* This is effectively a buffered-image operation. */
+ cinfo->buffered_image = TRUE;
+
+ /* Compute output image dimensions and related values. */
+ jpeg_core_output_dimensions(cinfo);
+
+ /* Entropy decoding: either Huffman or arithmetic coding. */
+ if (cinfo->arith_code)
+ jinit_arith_decoder(cinfo);
+ 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;
+ }
+}