1 files changed, 439 insertions, 0 deletions

diff --git a/libjpegtwrp/rdbmp.c b/libjpegtwrp/rdbmp.c
new file mode 100644
index 000000000..b05fe2ac4
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+++ b/libjpegtwrp/rdbmp.c
@@ -0,0 +1,439 @@
+/*
+ * rdbmp.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 routines to read input images in Microsoft "BMP"
+ * format (MS Windows 3.x, OS/2 1.x, and OS/2 2.x flavors).
+ * Currently, only 8-bit and 24-bit images are supported, not 1-bit or
+ * 4-bit (feeding such low-depth images into JPEG would be silly anyway).
+ * Also, we don't support RLE-compressed files.
+ *
+ * These routines may need modification for non-Unix environments or
+ * specialized applications.  As they stand, they assume input from
+ * an ordinary stdio stream.  They further assume that reading begins
+ * at the start of the file; start_input may need work if the
+ * user interface has already read some data (e.g., to determine that
+ * the file is indeed BMP format).
+ *
+ * This code contributed by James Arthur Boucher.
+ */
+
+#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
+
+#ifdef BMP_SUPPORTED
+
+
+/* Macros to deal with unsigned chars as efficiently as compiler allows */
+
+#ifdef HAVE_UNSIGNED_CHAR
+typedef unsigned char U_CHAR;
+#define UCH(x)	((int) (x))
+#else /* !HAVE_UNSIGNED_CHAR */
+#ifdef CHAR_IS_UNSIGNED
+typedef char U_CHAR;
+#define UCH(x)	((int) (x))
+#else
+typedef char U_CHAR;
+#define UCH(x)	((int) (x) & 0xFF)
+#endif
+#endif /* HAVE_UNSIGNED_CHAR */
+
+
+#define	ReadOK(file,buffer,len)	(JFREAD(file,buffer,len) == ((size_t) (len)))
+
+
+/* Private version of data source object */
+
+typedef struct _bmp_source_struct * bmp_source_ptr;
+
+typedef struct _bmp_source_struct {
+  struct cjpeg_source_struct pub; /* public fields */
+
+  j_compress_ptr cinfo;		/* back link saves passing separate parm */
+
+  JSAMPARRAY colormap;		/* BMP colormap (converted to my format) */
+
+  jvirt_sarray_ptr whole_image;	/* Needed to reverse row order */
+  JDIMENSION source_row;	/* Current source row number */
+  JDIMENSION row_width;		/* Physical width of scanlines in file */
+
+  int bits_per_pixel;		/* remembers 8- or 24-bit format */
+} bmp_source_struct;
+
+
+LOCAL(int)
+read_byte (bmp_source_ptr sinfo)
+/* Read next byte from BMP file */
+{
+  register FILE *infile = sinfo->pub.input_file;
+  register int c;
+
+  if ((c = getc(infile)) == EOF)
+    ERREXIT(sinfo->cinfo, JERR_INPUT_EOF);
+  return c;
+}
+
+
+LOCAL(void)
+read_colormap (bmp_source_ptr sinfo, int cmaplen, int mapentrysize)
+/* Read the colormap from a BMP file */
+{
+  int i;
+
+  switch (mapentrysize) {
+  case 3:
+    /* BGR format (occurs in OS/2 files) */
+    for (i = 0; i < cmaplen; i++) {
+      sinfo->colormap[2][i] = (JSAMPLE) read_byte(sinfo);
+      sinfo->colormap[1][i] = (JSAMPLE) read_byte(sinfo);
+      sinfo->colormap[0][i] = (JSAMPLE) read_byte(sinfo);
+    }
+    break;
+  case 4:
+    /* BGR0 format (occurs in MS Windows files) */
+    for (i = 0; i < cmaplen; i++) {
+      sinfo->colormap[2][i] = (JSAMPLE) read_byte(sinfo);
+      sinfo->colormap[1][i] = (JSAMPLE) read_byte(sinfo);
+      sinfo->colormap[0][i] = (JSAMPLE) read_byte(sinfo);
+      (void) read_byte(sinfo);
+    }
+    break;
+  default:
+    ERREXIT(sinfo->cinfo, JERR_BMP_BADCMAP);
+    break;
+  }
+}
+
+
+/*
+ * Read one row of pixels.
+ * The image has been read into the whole_image array, but is otherwise
+ * unprocessed.  We must read it out in top-to-bottom row order, and if
+ * it is an 8-bit image, we must expand colormapped pixels to 24bit format.
+ */
+
+METHODDEF(JDIMENSION)
+get_8bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
+/* This version is for reading 8-bit colormap indexes */
+{
+  bmp_source_ptr source = (bmp_source_ptr) sinfo;
+  register JSAMPARRAY colormap = source->colormap;
+  JSAMPARRAY image_ptr;
+  register int t;
+  register JSAMPROW inptr, outptr;
+  register JDIMENSION col;
+
+  /* Fetch next row from virtual array */
+  source->source_row--;
+  image_ptr = (*cinfo->mem->access_virt_sarray)
+    ((j_common_ptr) cinfo, source->whole_image,
+     source->source_row, (JDIMENSION) 1, FALSE);
+
+  /* Expand the colormap indexes to real data */
+  inptr = image_ptr[0];
+  outptr = source->pub.buffer[0];
+  for (col = cinfo->image_width; col > 0; col--) {
+    t = GETJSAMPLE(*inptr++);
+    *outptr++ = colormap[0][t];	/* can omit GETJSAMPLE() safely */
+    *outptr++ = colormap[1][t];
+    *outptr++ = colormap[2][t];
+  }
+
+  return 1;
+}
+
+
+METHODDEF(JDIMENSION)
+get_24bit_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
+/* This version is for reading 24-bit pixels */
+{
+  bmp_source_ptr source = (bmp_source_ptr) sinfo;
+  JSAMPARRAY image_ptr;
+  register JSAMPROW inptr, outptr;
+  register JDIMENSION col;
+
+  /* Fetch next row from virtual array */
+  source->source_row--;
+  image_ptr = (*cinfo->mem->access_virt_sarray)
+    ((j_common_ptr) cinfo, source->whole_image,
+     source->source_row, (JDIMENSION) 1, FALSE);
+
+  /* Transfer data.  Note source values are in BGR order
+   * (even though Microsoft's own documents say the opposite).
+   */
+  inptr = image_ptr[0];
+  outptr = source->pub.buffer[0];
+  for (col = cinfo->image_width; col > 0; col--) {
+    outptr[2] = *inptr++;	/* can omit GETJSAMPLE() safely */
+    outptr[1] = *inptr++;
+    outptr[0] = *inptr++;
+    outptr += 3;
+  }
+
+  return 1;
+}
+
+
+/*
+ * This method loads the image into whole_image during the first call on
+ * get_pixel_rows.  The get_pixel_rows pointer is then adjusted to call
+ * get_8bit_row or get_24bit_row on subsequent calls.
+ */
+
+METHODDEF(JDIMENSION)
+preload_image (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
+{
+  bmp_source_ptr source = (bmp_source_ptr) sinfo;
+  register FILE *infile = source->pub.input_file;
+  register int c;
+  register JSAMPROW out_ptr;
+  JSAMPARRAY image_ptr;
+  JDIMENSION row, col;
+  cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
+
+  /* Read the data into a virtual array in input-file row order. */
+  for (row = 0; row < cinfo->image_height; row++) {
+    if (progress != NULL) {
+      progress->pub.pass_counter = (long) row;
+      progress->pub.pass_limit = (long) cinfo->image_height;
+      (*progress->pub.progress_monitor) ((j_common_ptr) cinfo);
+    }
+    image_ptr = (*cinfo->mem->access_virt_sarray)
+      ((j_common_ptr) cinfo, source->whole_image,
+       row, (JDIMENSION) 1, TRUE);
+    out_ptr = image_ptr[0];
+    for (col = source->row_width; col > 0; col--) {
+      /* inline copy of read_byte() for speed */
+      if ((c = getc(infile)) == EOF)
+	ERREXIT(cinfo, JERR_INPUT_EOF);
+      *out_ptr++ = (JSAMPLE) c;
+    }
+  }
+  if (progress != NULL)
+    progress->completed_extra_passes++;
+
+  /* Set up to read from the virtual array in top-to-bottom order */
+  switch (source->bits_per_pixel) {
+  case 8:
+    source->pub.get_pixel_rows = get_8bit_row;
+    break;
+  case 24:
+    source->pub.get_pixel_rows = get_24bit_row;
+    break;
+  default:
+    ERREXIT(cinfo, JERR_BMP_BADDEPTH);
+  }
+  source->source_row = cinfo->image_height;
+
+  /* And read the first row */
+  return (*source->pub.get_pixel_rows) (cinfo, sinfo);
+}
+
+
+/*
+ * Read the file header; return image size and component count.
+ */
+
+METHODDEF(void)
+start_input_bmp (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
+{
+  bmp_source_ptr source = (bmp_source_ptr) sinfo;
+  U_CHAR bmpfileheader[14];
+  U_CHAR bmpinfoheader[64];
+#define GET_2B(array,offset)  ((unsigned int) UCH(array[offset]) + \
+			       (((unsigned int) UCH(array[offset+1])) << 8))
+#define GET_4B(array,offset)  ((INT32) UCH(array[offset]) + \
+			       (((INT32) UCH(array[offset+1])) << 8) + \
+			       (((INT32) UCH(array[offset+2])) << 16) + \
+			       (((INT32) UCH(array[offset+3])) << 24))
+  INT32 bfOffBits;
+  INT32 headerSize;
+  INT32 biWidth = 0;		/* initialize to avoid compiler warning */
+  INT32 biHeight = 0;
+  unsigned int biPlanes;
+  INT32 biCompression;
+  INT32 biXPelsPerMeter,biYPelsPerMeter;
+  INT32 biClrUsed = 0;
+  int mapentrysize = 0;		/* 0 indicates no colormap */
+  INT32 bPad;
+  JDIMENSION row_width;
+
+  /* Read and verify the bitmap file header */
+  if (! ReadOK(source->pub.input_file, bmpfileheader, 14))
+    ERREXIT(cinfo, JERR_INPUT_EOF);
+  if (GET_2B(bmpfileheader,0) != 0x4D42) /* 'BM' */
+    ERREXIT(cinfo, JERR_BMP_NOT);
+  bfOffBits = (INT32) GET_4B(bmpfileheader,10);
+  /* We ignore the remaining fileheader fields */
+
+  /* The infoheader might be 12 bytes (OS/2 1.x), 40 bytes (Windows),
+   * or 64 bytes (OS/2 2.x).  Check the first 4 bytes to find out which.
+   */
+  if (! ReadOK(source->pub.input_file, bmpinfoheader, 4))
+    ERREXIT(cinfo, JERR_INPUT_EOF);
+  headerSize = (INT32) GET_4B(bmpinfoheader,0);
+  if (headerSize < 12 || headerSize > 64)
+    ERREXIT(cinfo, JERR_BMP_BADHEADER);
+  if (! ReadOK(source->pub.input_file, bmpinfoheader+4, headerSize-4))
+    ERREXIT(cinfo, JERR_INPUT_EOF);
+
+  switch ((int) headerSize) {
+  case 12:
+    /* Decode OS/2 1.x header (Microsoft calls this a BITMAPCOREHEADER) */
+    biWidth = (INT32) GET_2B(bmpinfoheader,4);
+    biHeight = (INT32) GET_2B(bmpinfoheader,6);
+    biPlanes = GET_2B(bmpinfoheader,8);
+    source->bits_per_pixel = (int) GET_2B(bmpinfoheader,10);
+
+    switch (source->bits_per_pixel) {
+    case 8:			/* colormapped image */
+      mapentrysize = 3;		/* OS/2 uses RGBTRIPLE colormap */
+      TRACEMS2(cinfo, 1, JTRC_BMP_OS2_MAPPED, (int) biWidth, (int) biHeight);
+      break;
+    case 24:			/* RGB image */
+      TRACEMS2(cinfo, 1, JTRC_BMP_OS2, (int) biWidth, (int) biHeight);
+      break;
+    default:
+      ERREXIT(cinfo, JERR_BMP_BADDEPTH);
+      break;
+    }
+    if (biPlanes != 1)
+      ERREXIT(cinfo, JERR_BMP_BADPLANES);
+    break;
+  case 40:
+  case 64:
+    /* Decode Windows 3.x header (Microsoft calls this a BITMAPINFOHEADER) */
+    /* or OS/2 2.x header, which has additional fields that we ignore */
+    biWidth = GET_4B(bmpinfoheader,4);
+    biHeight = GET_4B(bmpinfoheader,8);
+    biPlanes = GET_2B(bmpinfoheader,12);
+    source->bits_per_pixel = (int) GET_2B(bmpinfoheader,14);
+    biCompression = GET_4B(bmpinfoheader,16);
+    biXPelsPerMeter = GET_4B(bmpinfoheader,24);
+    biYPelsPerMeter = GET_4B(bmpinfoheader,28);
+    biClrUsed = GET_4B(bmpinfoheader,32);
+    /* biSizeImage, biClrImportant fields are ignored */
+
+    switch (source->bits_per_pixel) {
+    case 8:			/* colormapped image */
+      mapentrysize = 4;		/* Windows uses RGBQUAD colormap */
+      TRACEMS2(cinfo, 1, JTRC_BMP_MAPPED, (int) biWidth, (int) biHeight);
+      break;
+    case 24:			/* RGB image */
+      TRACEMS2(cinfo, 1, JTRC_BMP, (int) biWidth, (int) biHeight);
+      break;
+    default:
+      ERREXIT(cinfo, JERR_BMP_BADDEPTH);
+      break;
+    }
+    if (biPlanes != 1)
+      ERREXIT(cinfo, JERR_BMP_BADPLANES);
+    if (biCompression != 0)
+      ERREXIT(cinfo, JERR_BMP_COMPRESSED);
+
+    if (biXPelsPerMeter > 0 && biYPelsPerMeter > 0) {
+      /* Set JFIF density parameters from the BMP data */
+      cinfo->X_density = (UINT16) (biXPelsPerMeter/100); /* 100 cm per meter */
+      cinfo->Y_density = (UINT16) (biYPelsPerMeter/100);
+      cinfo->density_unit = 2;	/* dots/cm */
+    }
+    break;
+  default:
+    ERREXIT(cinfo, JERR_BMP_BADHEADER);
+    break;
+  }
+
+  /* Compute distance to bitmap data --- will adjust for colormap below */
+  bPad = bfOffBits - (headerSize + 14);
+
+  /* Read the colormap, if any */
+  if (mapentrysize > 0) {
+    if (biClrUsed <= 0)
+      biClrUsed = 256;		/* assume it's 256 */
+    else if (biClrUsed > 256)
+      ERREXIT(cinfo, JERR_BMP_BADCMAP);
+    /* Allocate space to store the colormap */
+    source->colormap = (*cinfo->mem->alloc_sarray)
+      ((j_common_ptr) cinfo, JPOOL_IMAGE,
+       (JDIMENSION) biClrUsed, (JDIMENSION) 3);
+    /* and read it from the file */
+    read_colormap(source, (int) biClrUsed, mapentrysize);
+    /* account for size of colormap */
+    bPad -= biClrUsed * mapentrysize;
+  }
+
+  /* Skip any remaining pad bytes */
+  if (bPad < 0)			/* incorrect bfOffBits value? */
+    ERREXIT(cinfo, JERR_BMP_BADHEADER);
+  while (--bPad >= 0) {
+    (void) read_byte(source);
+  }
+
+  /* Compute row width in file, including padding to 4-byte boundary */
+  if (source->bits_per_pixel == 24)
+    row_width = (JDIMENSION) (biWidth * 3);
+  else
+    row_width = (JDIMENSION) biWidth;
+  while ((row_width & 3) != 0) row_width++;
+  source->row_width = row_width;
+
+  /* Allocate space for inversion array, prepare for preload pass */
+  source->whole_image = (*cinfo->mem->request_virt_sarray)
+    ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE,
+     row_width, (JDIMENSION) biHeight, (JDIMENSION) 1);
+  source->pub.get_pixel_rows = preload_image;
+  if (cinfo->progress != NULL) {
+    cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress;
+    progress->total_extra_passes++; /* count file input as separate pass */
+  }
+
+  /* Allocate one-row buffer for returned data */
+  source->pub.buffer = (*cinfo->mem->alloc_sarray)
+    ((j_common_ptr) cinfo, JPOOL_IMAGE,
+     (JDIMENSION) (biWidth * 3), (JDIMENSION) 1);
+  source->pub.buffer_height = 1;
+
+  cinfo->in_color_space = JCS_RGB;
+  cinfo->input_components = 3;
+  cinfo->data_precision = 8;
+  cinfo->image_width = (JDIMENSION) biWidth;
+  cinfo->image_height = (JDIMENSION) biHeight;
+}
+
+
+/*
+ * Finish up at the end of the file.
+ */
+
+METHODDEF(void)
+finish_input_bmp (j_compress_ptr cinfo, cjpeg_source_ptr sinfo)
+{
+  /* no work */
+}
+
+
+/*
+ * The module selection routine for BMP format input.
+ */
+
+GLOBAL(cjpeg_source_ptr)
+jinit_read_bmp (j_compress_ptr cinfo)
+{
+  bmp_source_ptr source;
+
+  /* Create module interface object */
+  source = (bmp_source_ptr)
+      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  SIZEOF(bmp_source_struct));
+  source->cinfo = cinfo;	/* make back link for subroutines */
+  /* Fill in method ptrs, except get_pixel_rows which start_input sets */
+  source->pub.start_input = start_input_bmp;
+  source->pub.finish_input = finish_input_bmp;
+
+  return (cjpeg_source_ptr) source;
+}
+
+#endif /* BMP_SUPPORTED */