newlines fixed

git-svn-id: svn://svn.icculus.org/quake3/trunk@6 edf5b092-35ff-0310-97b2-ce42778d08ea

1 files changed, 381 insertions, 381 deletions

diff --git a/code/jpeg-6/jdinput.c b/code/jpeg-6/jdinput.c
index 5b4774f..3061a17 100755
--- a/code/jpeg-6/jdinput.c
+++ b/code/jpeg-6/jdinput.c
@@ -1,381 +1,381 @@
-/*

- * jdinput.c

- *

- * Copyright (C) 1991-1995, 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 input control logic for the JPEG decompressor.

- * These routines are concerned with controlling the decompressor's input

- * processing (marker reading and coefficient decoding).  The actual input

- * reading is done in jdmarker.c, jdhuff.c, and jdphuff.c.

- */

-

-#define JPEG_INTERNALS

-#include "jinclude.h"

-#include "jpeglib.h"

-

-

-/* Private state */

-

-typedef struct {

-  struct jpeg_input_controller pub; /* public fields */

-

-  boolean inheaders;		/* TRUE until first SOS is reached */

-} my_input_controller;

-

-typedef my_input_controller * my_inputctl_ptr;

-

-

-/* Forward declarations */

-METHODDEF int consume_markers JPP((j_decompress_ptr cinfo));

-

-

-/*

- * Routines to calculate various quantities related to the size of the image.

- */

-

-LOCAL void

-initial_setup (j_decompress_ptr cinfo)

-/* Called once, when first SOS marker is reached */

-{

-  int ci;

-  jpeg_component_info *compptr;

-

-  /* Make sure image isn't bigger than I can handle */

-  if ((long) cinfo->image_height > (long) JPEG_MAX_DIMENSION ||

-      (long) cinfo->image_width > (long) JPEG_MAX_DIMENSION)

-    ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);

-

-  /* For now, precision must match compiled-in value... */

-  if (cinfo->data_precision != BITS_IN_JSAMPLE)

-    ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);

-

-  /* Check that number of components won't exceed internal array sizes */

-  if (cinfo->num_components > MAX_COMPONENTS)

-    ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,

-	     MAX_COMPONENTS);

-

-  /* Compute maximum sampling factors; check factor validity */

-  cinfo->max_h_samp_factor = 1;

-  cinfo->max_v_samp_factor = 1;

-  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;

-       ci++, compptr++) {

-    if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR ||

-	compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR)

-      ERREXIT(cinfo, JERR_BAD_SAMPLING);

-    cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor,

-				   compptr->h_samp_factor);

-    cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor,

-				   compptr->v_samp_factor);

-  }

-

-  /* We initialize DCT_scaled_size and min_DCT_scaled_size to DCTSIZE.

-   * In the full decompressor, this will be overridden by jdmaster.c;

-   * but in the transcoder, jdmaster.c is not used, so we must do it here.

-   */

-  cinfo->min_DCT_scaled_size = DCTSIZE;

-

-  /* Compute dimensions of components */

-  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;

-       ci++, compptr++) {

-    compptr->DCT_scaled_size = DCTSIZE;

-    /* Size in DCT blocks */

-    compptr->width_in_blocks = (JDIMENSION)

-      jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,

-		    (long) (cinfo->max_h_samp_factor * DCTSIZE));

-    compptr->height_in_blocks = (JDIMENSION)

-      jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,

-		    (long) (cinfo->max_v_samp_factor * DCTSIZE));

-    /* downsampled_width and downsampled_height will also be overridden by

-     * jdmaster.c if we are doing full decompression.  The transcoder library

-     * doesn't use these values, but the calling application might.

-     */

-    /* Size in samples */

-    compptr->downsampled_width = (JDIMENSION)

-      jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,

-		    (long) cinfo->max_h_samp_factor);

-    compptr->downsampled_height = (JDIMENSION)

-      jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,

-		    (long) cinfo->max_v_samp_factor);

-    /* Mark component needed, until color conversion says otherwise */

-    compptr->component_needed = TRUE;

-    /* Mark no quantization table yet saved for component */

-    compptr->quant_table = NULL;

-  }

-

-  /* Compute number of fully interleaved MCU rows. */

-  cinfo->total_iMCU_rows = (JDIMENSION)

-    jdiv_round_up((long) cinfo->image_height,

-		  (long) (cinfo->max_v_samp_factor*DCTSIZE));

-

-  /* Decide whether file contains multiple scans */

-  if (cinfo->comps_in_scan < cinfo->num_components || cinfo->progressive_mode)

-    cinfo->inputctl->has_multiple_scans = TRUE;

-  else

-    cinfo->inputctl->has_multiple_scans = FALSE;

-}

-

-

-LOCAL void

-per_scan_setup (j_decompress_ptr cinfo)

-/* Do computations that are needed before processing a JPEG scan */

-/* cinfo->comps_in_scan and cinfo->cur_comp_info[] were set from SOS marker */

-{

-  int ci, mcublks, tmp;

-  jpeg_component_info *compptr;

-  

-  if (cinfo->comps_in_scan == 1) {

-    

-    /* Noninterleaved (single-component) scan */

-    compptr = cinfo->cur_comp_info[0];

-    

-    /* Overall image size in MCUs */

-    cinfo->MCUs_per_row = compptr->width_in_blocks;

-    cinfo->MCU_rows_in_scan = compptr->height_in_blocks;

-    

-    /* For noninterleaved scan, always one block per MCU */

-    compptr->MCU_width = 1;

-    compptr->MCU_height = 1;

-    compptr->MCU_blocks = 1;

-    compptr->MCU_sample_width = compptr->DCT_scaled_size;

-    compptr->last_col_width = 1;

-    /* For noninterleaved scans, it is convenient to define last_row_height

-     * as the number of block rows present in the last iMCU row.

-     */

-    tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor);

-    if (tmp == 0) tmp = compptr->v_samp_factor;

-    compptr->last_row_height = tmp;

-    

-    /* Prepare array describing MCU composition */

-    cinfo->blocks_in_MCU = 1;

-    cinfo->MCU_membership[0] = 0;

-    

-  } else {

-    

-    /* Interleaved (multi-component) scan */

-    if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN)

-      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan,

-	       MAX_COMPS_IN_SCAN);

-    

-    /* Overall image size in MCUs */

-    cinfo->MCUs_per_row = (JDIMENSION)

-      jdiv_round_up((long) cinfo->image_width,

-		    (long) (cinfo->max_h_samp_factor*DCTSIZE));

-    cinfo->MCU_rows_in_scan = (JDIMENSION)

-      jdiv_round_up((long) cinfo->image_height,

-		    (long) (cinfo->max_v_samp_factor*DCTSIZE));

-    

-    cinfo->blocks_in_MCU = 0;

-    

-    for (ci = 0; ci < cinfo->comps_in_scan; ci++) {

-      compptr = cinfo->cur_comp_info[ci];

-      /* Sampling factors give # of blocks of component in each MCU */

-      compptr->MCU_width = compptr->h_samp_factor;

-      compptr->MCU_height = compptr->v_samp_factor;

-      compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;

-      compptr->MCU_sample_width = compptr->MCU_width * compptr->DCT_scaled_size;

-      /* Figure number of non-dummy blocks in last MCU column & row */

-      tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);

-      if (tmp == 0) tmp = compptr->MCU_width;

-      compptr->last_col_width = tmp;

-      tmp = (int) (compptr->height_in_blocks % compptr->MCU_height);

-      if (tmp == 0) tmp = compptr->MCU_height;

-      compptr->last_row_height = tmp;

-      /* Prepare array describing MCU composition */

-      mcublks = compptr->MCU_blocks;

-      if (cinfo->blocks_in_MCU + mcublks > D_MAX_BLOCKS_IN_MCU)

-	ERREXIT(cinfo, JERR_BAD_MCU_SIZE);

-      while (mcublks-- > 0) {

-	cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci;

-      }

-    }

-    

-  }

-}

-

-

-/*

- * Save away a copy of the Q-table referenced by each component present

- * in the current scan, unless already saved during a prior scan.

- *

- * In a multiple-scan JPEG file, the encoder could assign different components

- * the same Q-table slot number, but change table definitions between scans

- * so that each component uses a different Q-table.  (The IJG encoder is not

- * currently capable of doing this, but other encoders might.)  Since we want

- * to be able to dequantize all the components at the end of the file, this

- * means that we have to save away the table actually used for each component.

- * We do this by copying the table at the start of the first scan containing

- * the component.

- * The JPEG spec prohibits the encoder from changing the contents of a Q-table

- * slot between scans of a component using that slot.  If the encoder does so

- * anyway, this decoder will simply use the Q-table values that were current

- * at the start of the first scan for the component.

- *

- * The decompressor output side looks only at the saved quant tables,

- * not at the current Q-table slots.

- */

-

-LOCAL void

-latch_quant_tables (j_decompress_ptr cinfo)

-{

-  int ci, qtblno;

-  jpeg_component_info *compptr;

-  JQUANT_TBL * qtbl;

-

-  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {

-    compptr = cinfo->cur_comp_info[ci];

-    /* No work if we already saved Q-table for this component */

-    if (compptr->quant_table != NULL)

-      continue;

-    /* Make sure specified quantization table is present */

-    qtblno = compptr->quant_tbl_no;

-    if (qtblno < 0 || qtblno >= NUM_QUANT_TBLS ||

-	cinfo->quant_tbl_ptrs[qtblno] == NULL)

-      ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, qtblno);

-    /* OK, save away the quantization table */

-    qtbl = (JQUANT_TBL *)

-      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,

-				  SIZEOF(JQUANT_TBL));

-    MEMCOPY(qtbl, cinfo->quant_tbl_ptrs[qtblno], SIZEOF(JQUANT_TBL));

-    compptr->quant_table = qtbl;

-  }

-}

-

-

-/*

- * Initialize the input modules to read a scan of compressed data.

- * The first call to this is done by jdmaster.c after initializing

- * the entire decompressor (during jpeg_start_decompress).

- * Subsequent calls come from consume_markers, below.

- */

-

-METHODDEF void

-start_input_pass (j_decompress_ptr cinfo)

-{

-  per_scan_setup(cinfo);

-  latch_quant_tables(cinfo);

-  (*cinfo->entropy->start_pass) (cinfo);

-  (*cinfo->coef->start_input_pass) (cinfo);

-  cinfo->inputctl->consume_input = cinfo->coef->consume_data;

-}

-

-

-/*

- * Finish up after inputting a compressed-data scan.

- * This is called by the coefficient controller after it's read all

- * the expected data of the scan.

- */

-

-METHODDEF void

-finish_input_pass (j_decompress_ptr cinfo)

-{

-  cinfo->inputctl->consume_input = consume_markers;

-}

-

-

-/*

- * Read JPEG markers before, between, or after compressed-data scans.

- * Change state as necessary when a new scan is reached.

- * Return value is JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.

- *

- * The consume_input method pointer points either here or to the

- * coefficient controller's consume_data routine, depending on whether

- * we are reading a compressed data segment or inter-segment markers.

- */

-

-METHODDEF int

-consume_markers (j_decompress_ptr cinfo)

-{

-  my_inputctl_ptr inputctl = (my_inputctl_ptr) cinfo->inputctl;

-  int val;

-

-  if (inputctl->pub.eoi_reached) /* After hitting EOI, read no further */

-    return JPEG_REACHED_EOI;

-

-  val = (*cinfo->marker->read_markers) (cinfo);

-

-  switch (val) {

-  case JPEG_REACHED_SOS:	/* Found SOS */

-    if (inputctl->inheaders) {	/* 1st SOS */

-      initial_setup(cinfo);

-      inputctl->inheaders = FALSE;

-      /* Note: start_input_pass must be called by jdmaster.c

-       * before any more input can be consumed.  jdapi.c is

-       * responsible for enforcing this sequencing.

-       */

-    } else {			/* 2nd or later SOS marker */

-      if (! inputctl->pub.has_multiple_scans)

-	ERREXIT(cinfo, JERR_EOI_EXPECTED); /* Oops, I wasn't expecting this! */

-      start_input_pass(cinfo);

-    }

-    break;

-  case JPEG_REACHED_EOI:	/* Found EOI */

-    inputctl->pub.eoi_reached = TRUE;

-    if (inputctl->inheaders) {	/* Tables-only datastream, apparently */

-      if (cinfo->marker->saw_SOF)

-	ERREXIT(cinfo, JERR_SOF_NO_SOS);

-    } else {

-      /* Prevent infinite loop in coef ctlr's decompress_data routine

-       * if user set output_scan_number larger than number of scans.

-       */

-      if (cinfo->output_scan_number > cinfo->input_scan_number)

-	cinfo->output_scan_number = cinfo->input_scan_number;

-    }

-    break;

-  case JPEG_SUSPENDED:

-    break;

-  }

-

-  return val;

-}

-

-

-/*

- * Reset state to begin a fresh datastream.

- */

-

-METHODDEF void

-reset_input_controller (j_decompress_ptr cinfo)

-{

-  my_inputctl_ptr inputctl = (my_inputctl_ptr) cinfo->inputctl;

-

-  inputctl->pub.consume_input = consume_markers;

-  inputctl->pub.has_multiple_scans = FALSE; /* "unknown" would be better */

-  inputctl->pub.eoi_reached = FALSE;

-  inputctl->inheaders = TRUE;

-  /* Reset other modules */

-  (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);

-  (*cinfo->marker->reset_marker_reader) (cinfo);

-  /* Reset progression state -- would be cleaner if entropy decoder did this */

-  cinfo->coef_bits = NULL;

-}

-

-

-/*

- * Initialize the input controller module.

- * This is called only once, when the decompression object is created.

- */

-

-GLOBAL void

-jinit_input_controller (j_decompress_ptr cinfo)

-{

-  my_inputctl_ptr inputctl;

-

-  /* Create subobject in permanent pool */

-  inputctl = (my_inputctl_ptr)

-    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,

-				SIZEOF(my_input_controller));

-  cinfo->inputctl = (struct jpeg_input_controller *) inputctl;

-  /* Initialize method pointers */

-  inputctl->pub.consume_input = consume_markers;

-  inputctl->pub.reset_input_controller = reset_input_controller;

-  inputctl->pub.start_input_pass = start_input_pass;

-  inputctl->pub.finish_input_pass = finish_input_pass;

-  /* Initialize state: can't use reset_input_controller since we don't

-   * want to try to reset other modules yet.

-   */

-  inputctl->pub.has_multiple_scans = FALSE; /* "unknown" would be better */

-  inputctl->pub.eoi_reached = FALSE;

-  inputctl->inheaders = TRUE;

-}

+/*
+ * jdinput.c
+ *
+ * Copyright (C) 1991-1995, 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 input control logic for the JPEG decompressor.
+ * These routines are concerned with controlling the decompressor's input
+ * processing (marker reading and coefficient decoding).  The actual input
+ * reading is done in jdmarker.c, jdhuff.c, and jdphuff.c.
+ */
+
+#define JPEG_INTERNALS
+#include "jinclude.h"
+#include "jpeglib.h"
+
+
+/* Private state */
+
+typedef struct {
+  struct jpeg_input_controller pub; /* public fields */
+
+  boolean inheaders;		/* TRUE until first SOS is reached */
+} my_input_controller;
+
+typedef my_input_controller * my_inputctl_ptr;
+
+
+/* Forward declarations */
+METHODDEF int consume_markers JPP((j_decompress_ptr cinfo));
+
+
+/*
+ * Routines to calculate various quantities related to the size of the image.
+ */
+
+LOCAL void
+initial_setup (j_decompress_ptr cinfo)
+/* Called once, when first SOS marker is reached */
+{
+  int ci;
+  jpeg_component_info *compptr;
+
+  /* Make sure image isn't bigger than I can handle */
+  if ((long) cinfo->image_height > (long) JPEG_MAX_DIMENSION ||
+      (long) cinfo->image_width > (long) JPEG_MAX_DIMENSION)
+    ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
+
+  /* For now, precision must match compiled-in value... */
+  if (cinfo->data_precision != BITS_IN_JSAMPLE)
+    ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
+
+  /* Check that number of components won't exceed internal array sizes */
+  if (cinfo->num_components > MAX_COMPONENTS)
+    ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
+	     MAX_COMPONENTS);
+
+  /* Compute maximum sampling factors; check factor validity */
+  cinfo->max_h_samp_factor = 1;
+  cinfo->max_v_samp_factor = 1;
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR ||
+	compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR)
+      ERREXIT(cinfo, JERR_BAD_SAMPLING);
+    cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor,
+				   compptr->h_samp_factor);
+    cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor,
+				   compptr->v_samp_factor);
+  }
+
+  /* We initialize DCT_scaled_size and min_DCT_scaled_size to DCTSIZE.
+   * In the full decompressor, this will be overridden by jdmaster.c;
+   * but in the transcoder, jdmaster.c is not used, so we must do it here.
+   */
+  cinfo->min_DCT_scaled_size = DCTSIZE;
+
+  /* Compute dimensions of components */
+  for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
+       ci++, compptr++) {
+    compptr->DCT_scaled_size = DCTSIZE;
+    /* Size in DCT blocks */
+    compptr->width_in_blocks = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
+		    (long) (cinfo->max_h_samp_factor * DCTSIZE));
+    compptr->height_in_blocks = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
+		    (long) (cinfo->max_v_samp_factor * DCTSIZE));
+    /* downsampled_width and downsampled_height will also be overridden by
+     * jdmaster.c if we are doing full decompression.  The transcoder library
+     * doesn't use these values, but the calling application might.
+     */
+    /* Size in samples */
+    compptr->downsampled_width = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
+		    (long) cinfo->max_h_samp_factor);
+    compptr->downsampled_height = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
+		    (long) cinfo->max_v_samp_factor);
+    /* Mark component needed, until color conversion says otherwise */
+    compptr->component_needed = TRUE;
+    /* Mark no quantization table yet saved for component */
+    compptr->quant_table = NULL;
+  }
+
+  /* Compute number of fully interleaved MCU rows. */
+  cinfo->total_iMCU_rows = (JDIMENSION)
+    jdiv_round_up((long) cinfo->image_height,
+		  (long) (cinfo->max_v_samp_factor*DCTSIZE));
+
+  /* Decide whether file contains multiple scans */
+  if (cinfo->comps_in_scan < cinfo->num_components || cinfo->progressive_mode)
+    cinfo->inputctl->has_multiple_scans = TRUE;
+  else
+    cinfo->inputctl->has_multiple_scans = FALSE;
+}
+
+
+LOCAL void
+per_scan_setup (j_decompress_ptr cinfo)
+/* Do computations that are needed before processing a JPEG scan */
+/* cinfo->comps_in_scan and cinfo->cur_comp_info[] were set from SOS marker */
+{
+  int ci, mcublks, tmp;
+  jpeg_component_info *compptr;
+  
+  if (cinfo->comps_in_scan == 1) {
+    
+    /* Noninterleaved (single-component) scan */
+    compptr = cinfo->cur_comp_info[0];
+    
+    /* Overall image size in MCUs */
+    cinfo->MCUs_per_row = compptr->width_in_blocks;
+    cinfo->MCU_rows_in_scan = compptr->height_in_blocks;
+    
+    /* For noninterleaved scan, always one block per MCU */
+    compptr->MCU_width = 1;
+    compptr->MCU_height = 1;
+    compptr->MCU_blocks = 1;
+    compptr->MCU_sample_width = compptr->DCT_scaled_size;
+    compptr->last_col_width = 1;
+    /* For noninterleaved scans, it is convenient to define last_row_height
+     * as the number of block rows present in the last iMCU row.
+     */
+    tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
+    if (tmp == 0) tmp = compptr->v_samp_factor;
+    compptr->last_row_height = tmp;
+    
+    /* Prepare array describing MCU composition */
+    cinfo->blocks_in_MCU = 1;
+    cinfo->MCU_membership[0] = 0;
+    
+  } else {
+    
+    /* Interleaved (multi-component) scan */
+    if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN)
+      ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan,
+	       MAX_COMPS_IN_SCAN);
+    
+    /* Overall image size in MCUs */
+    cinfo->MCUs_per_row = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_width,
+		    (long) (cinfo->max_h_samp_factor*DCTSIZE));
+    cinfo->MCU_rows_in_scan = (JDIMENSION)
+      jdiv_round_up((long) cinfo->image_height,
+		    (long) (cinfo->max_v_samp_factor*DCTSIZE));
+    
+    cinfo->blocks_in_MCU = 0;
+    
+    for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+      compptr = cinfo->cur_comp_info[ci];
+      /* Sampling factors give # of blocks of component in each MCU */
+      compptr->MCU_width = compptr->h_samp_factor;
+      compptr->MCU_height = compptr->v_samp_factor;
+      compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;
+      compptr->MCU_sample_width = compptr->MCU_width * compptr->DCT_scaled_size;
+      /* Figure number of non-dummy blocks in last MCU column & row */
+      tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);
+      if (tmp == 0) tmp = compptr->MCU_width;
+      compptr->last_col_width = tmp;
+      tmp = (int) (compptr->height_in_blocks % compptr->MCU_height);
+      if (tmp == 0) tmp = compptr->MCU_height;
+      compptr->last_row_height = tmp;
+      /* Prepare array describing MCU composition */
+      mcublks = compptr->MCU_blocks;
+      if (cinfo->blocks_in_MCU + mcublks > D_MAX_BLOCKS_IN_MCU)
+	ERREXIT(cinfo, JERR_BAD_MCU_SIZE);
+      while (mcublks-- > 0) {
+	cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci;
+      }
+    }
+    
+  }
+}
+
+
+/*
+ * Save away a copy of the Q-table referenced by each component present
+ * in the current scan, unless already saved during a prior scan.
+ *
+ * In a multiple-scan JPEG file, the encoder could assign different components
+ * the same Q-table slot number, but change table definitions between scans
+ * so that each component uses a different Q-table.  (The IJG encoder is not
+ * currently capable of doing this, but other encoders might.)  Since we want
+ * to be able to dequantize all the components at the end of the file, this
+ * means that we have to save away the table actually used for each component.
+ * We do this by copying the table at the start of the first scan containing
+ * the component.
+ * The JPEG spec prohibits the encoder from changing the contents of a Q-table
+ * slot between scans of a component using that slot.  If the encoder does so
+ * anyway, this decoder will simply use the Q-table values that were current
+ * at the start of the first scan for the component.
+ *
+ * The decompressor output side looks only at the saved quant tables,
+ * not at the current Q-table slots.
+ */
+
+LOCAL void
+latch_quant_tables (j_decompress_ptr cinfo)
+{
+  int ci, qtblno;
+  jpeg_component_info *compptr;
+  JQUANT_TBL * qtbl;
+
+  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
+    compptr = cinfo->cur_comp_info[ci];
+    /* No work if we already saved Q-table for this component */
+    if (compptr->quant_table != NULL)
+      continue;
+    /* Make sure specified quantization table is present */
+    qtblno = compptr->quant_tbl_no;
+    if (qtblno < 0 || qtblno >= NUM_QUANT_TBLS ||
+	cinfo->quant_tbl_ptrs[qtblno] == NULL)
+      ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, qtblno);
+    /* OK, save away the quantization table */
+    qtbl = (JQUANT_TBL *)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  SIZEOF(JQUANT_TBL));
+    MEMCOPY(qtbl, cinfo->quant_tbl_ptrs[qtblno], SIZEOF(JQUANT_TBL));
+    compptr->quant_table = qtbl;
+  }
+}
+
+
+/*
+ * Initialize the input modules to read a scan of compressed data.
+ * The first call to this is done by jdmaster.c after initializing
+ * the entire decompressor (during jpeg_start_decompress).
+ * Subsequent calls come from consume_markers, below.
+ */
+
+METHODDEF void
+start_input_pass (j_decompress_ptr cinfo)
+{
+  per_scan_setup(cinfo);
+  latch_quant_tables(cinfo);
+  (*cinfo->entropy->start_pass) (cinfo);
+  (*cinfo->coef->start_input_pass) (cinfo);
+  cinfo->inputctl->consume_input = cinfo->coef->consume_data;
+}
+
+
+/*
+ * Finish up after inputting a compressed-data scan.
+ * This is called by the coefficient controller after it's read all
+ * the expected data of the scan.
+ */
+
+METHODDEF void
+finish_input_pass (j_decompress_ptr cinfo)
+{
+  cinfo->inputctl->consume_input = consume_markers;
+}
+
+
+/*
+ * Read JPEG markers before, between, or after compressed-data scans.
+ * Change state as necessary when a new scan is reached.
+ * Return value is JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
+ *
+ * The consume_input method pointer points either here or to the
+ * coefficient controller's consume_data routine, depending on whether
+ * we are reading a compressed data segment or inter-segment markers.
+ */
+
+METHODDEF int
+consume_markers (j_decompress_ptr cinfo)
+{
+  my_inputctl_ptr inputctl = (my_inputctl_ptr) cinfo->inputctl;
+  int val;
+
+  if (inputctl->pub.eoi_reached) /* After hitting EOI, read no further */
+    return JPEG_REACHED_EOI;
+
+  val = (*cinfo->marker->read_markers) (cinfo);
+
+  switch (val) {
+  case JPEG_REACHED_SOS:	/* Found SOS */
+    if (inputctl->inheaders) {	/* 1st SOS */
+      initial_setup(cinfo);
+      inputctl->inheaders = FALSE;
+      /* Note: start_input_pass must be called by jdmaster.c
+       * before any more input can be consumed.  jdapi.c is
+       * responsible for enforcing this sequencing.
+       */
+    } else {			/* 2nd or later SOS marker */
+      if (! inputctl->pub.has_multiple_scans)
+	ERREXIT(cinfo, JERR_EOI_EXPECTED); /* Oops, I wasn't expecting this! */
+      start_input_pass(cinfo);
+    }
+    break;
+  case JPEG_REACHED_EOI:	/* Found EOI */
+    inputctl->pub.eoi_reached = TRUE;
+    if (inputctl->inheaders) {	/* Tables-only datastream, apparently */
+      if (cinfo->marker->saw_SOF)
+	ERREXIT(cinfo, JERR_SOF_NO_SOS);
+    } else {
+      /* Prevent infinite loop in coef ctlr's decompress_data routine
+       * if user set output_scan_number larger than number of scans.
+       */
+      if (cinfo->output_scan_number > cinfo->input_scan_number)
+	cinfo->output_scan_number = cinfo->input_scan_number;
+    }
+    break;
+  case JPEG_SUSPENDED:
+    break;
+  }
+
+  return val;
+}
+
+
+/*
+ * Reset state to begin a fresh datastream.
+ */
+
+METHODDEF void
+reset_input_controller (j_decompress_ptr cinfo)
+{
+  my_inputctl_ptr inputctl = (my_inputctl_ptr) cinfo->inputctl;
+
+  inputctl->pub.consume_input = consume_markers;
+  inputctl->pub.has_multiple_scans = FALSE; /* "unknown" would be better */
+  inputctl->pub.eoi_reached = FALSE;
+  inputctl->inheaders = TRUE;
+  /* Reset other modules */
+  (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
+  (*cinfo->marker->reset_marker_reader) (cinfo);
+  /* Reset progression state -- would be cleaner if entropy decoder did this */
+  cinfo->coef_bits = NULL;
+}
+
+
+/*
+ * Initialize the input controller module.
+ * This is called only once, when the decompression object is created.
+ */
+
+GLOBAL void
+jinit_input_controller (j_decompress_ptr cinfo)
+{
+  my_inputctl_ptr inputctl;
+
+  /* Create subobject in permanent pool */
+  inputctl = (my_inputctl_ptr)
+    (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
+				SIZEOF(my_input_controller));
+  cinfo->inputctl = (struct jpeg_input_controller *) inputctl;
+  /* Initialize method pointers */
+  inputctl->pub.consume_input = consume_markers;
+  inputctl->pub.reset_input_controller = reset_input_controller;
+  inputctl->pub.start_input_pass = start_input_pass;
+  inputctl->pub.finish_input_pass = finish_input_pass;
+  /* Initialize state: can't use reset_input_controller since we don't
+   * want to try to reset other modules yet.
+   */
+  inputctl->pub.has_multiple_scans = FALSE; /* "unknown" would be better */
+  inputctl->pub.eoi_reached = FALSE;
+  inputctl->inheaders = TRUE;
+}