--- /dev/null
+#include <stdio.h>
+#include "gdcmFile.h"
+
+#define BITS_IN_JSAMPLE 12
+
+// BITS_IN_JSAMPLE is a compile time defined options.
+// We need both 8 an 12;
+// To avoid renaming *all* the Jpeg functions,
+// we hard code the 'brain damaged liker' option.
+// For all the functions, we shall have the 8 and 12 version
+// (8 with the 'long' name, 12 with the 'short' name)
+
+#define jpeg_read_header jReadHeader
+#define my_error_exit myErrorExit
+#define jpeg_destroy_decompress jDestDecompress
+#define jpeg_stdio_src jStdSrc
+#define jpeg_read_header jReadHeader
+#define jpeg_read_scanlines jReadScanlines
+#define jpeg_finish_decompress jFinDecompress
+#define jpeg_create_decompress jCreaDecompress
+
+// -----------------
+#define jpeg_std_error jStdError
+#define jpeg_CreateCompress jCreaCompress
+#define jpeg_CreateDecompress jCreaDecompress
+#define jpeg_destroy_compress jDestCompress
+#define jpeg_destroy_decompress jDestDecompress
+#define jpeg_stdio_dest jStdDest
+#define jpeg_stdio_src jStdSrc
+#define jpeg_set_defaults jSetDefaults
+#define jpeg_set_colorspace jSetColorspace
+#define jpeg_default_colorspace jDefColorspace
+#define jpeg_set_quality jSetQuality
+#define jpeg_set_linear_quality jSetLQuality
+#define jpeg_add_quant_table jAddQuantTable
+#define jpeg_quality_scaling jQualityScaling
+#define jpeg_simple_progression jSimProgress
+#define jpeg_suppress_tables jSuppressTables
+#define jpeg_alloc_quant_table jAlcQTable
+#define jpeg_alloc_huff_table jAlcHTable
+#define jpeg_start_compress jStrtCompress
+#define jpeg_write_scanlines jWrtScanlines
+#define jpeg_finish_compress jFinCompress
+#define jpeg_write_raw_data jWrtRawData
+#define jpeg_write_marker jWrtMarker
+#define jpeg_write_m_header jWrtMHeader
+#define jpeg_write_m_byte jWrtMByte
+#define jpeg_write_tables jWrtTables
+#define jpeg_read_header jReadHeader
+#define jpeg_start_decompress jStrtDecompress
+#define jpeg_read_scanlines jReadScanlines
+#define jpeg_finish_decompress jFinDecompress
+#define jpeg_read_raw_data jReadRawData
+#define jpeg_has_multiple_scans jHasMultScn
+#define jpeg_start_output jStrtOutput
+#define jpeg_finish_output jFinOutput
+#define jpeg_input_complete jInComplete
+#define jpeg_new_colormap jNewCMap
+#define jpeg_consume_input jConsumeInput
+#define jpeg_calc_output_dimensions jCalcDimensions
+#define jpeg_save_markers jSaveMarkers
+#define jpeg_set_marker_processor jSetMarker
+#define jpeg_read_coefficients jReadCoefs
+#define jpeg_write_coefficients jWrtCoefs
+#define jpeg_copy_critical_parameters jCopyCrit
+#define jpeg_abort_compress jAbrtCompress
+#define jpeg_abort_decompress jAbrtDecompress
+#define jpeg_abort jAbort
+#define jpeg_destroy jDestroy
+#define jpeg_resync_to_restart jResyncRestart
+
+// -----------------
+
+#define DEBUG 0
+
+
+/*
+ * <setjmp.h> is used for the optional error recovery mechanism shown in
+ * the second part of the example.
+ */
+
+/*
+ * Include file for users of JPEG library.
+ * You will need to have included system headers that define at least
+ * the typedefs FILE and size_t before you can include jpeglib.h.
+ * (stdio.h is sufficient on ANSI-conforming systems.)
+ * You may also wish to include "jerror.h".
+ */
+
+extern "C" {
+#include "jpeg/libijg12/jpeglib12.h"
+#include <setjmp.h>
+}
+
+/******************** JPEG DECOMPRESSION SAMPLE INTERFACE *******************/
+
+/* This half of the example shows how to read data from the JPEG decompressor.
+ * It's a bit more refined than the above, in that we show:
+ * (a) how to modify the JPEG library's standard error-reporting behavior;
+ * (b) how to allocate workspace using the library's memory manager.
+ *
+ * Just to make this example a little different from the first one, we'll
+ * assume that we do not intend to put the whole image into an in-memory
+ * buffer, but to send it line-by-line someplace else. We need a one-
+ * scanline-high JSAMPLE array as a work buffer, and we will let the JPEG
+ * memory manager allocate it for us. This approach is actually quite useful
+ * because we don't need to remember to deallocate the buffer separately: it
+ * will go away automatically when the JPEG object is cleaned up.
+ */
+
+/*
+ * ERROR HANDLING:
+ *
+ * The JPEG library's standard error handler (jerror.c) is divided into
+ * several "methods" which you can override individually. This lets you
+ * adjust the behavior without duplicating a lot of code, which you might
+ * have to update with each future release.
+ *
+ * Our example here shows how to override the "error_exit" method so that
+ * control is returned to the library's caller when a fatal error occurs,
+ * rather than calling exit() as the standard error_exit method does.
+ *
+ * We use C's setjmp/longjmp facility to return control. This means that the
+ * routine which calls the JPEG library must first execute a setjmp() call to
+ * establish the return point. We want the replacement error_exit to do a
+ * longjmp(). But we need to make the setjmp buffer accessible to the
+ * error_exit routine. To do this, we make a private extension of the
+ * standard JPEG error handler object. (If we were using C++, we'd say we
+ * were making a subclass of the regular error handler.)
+ *
+ * Here's the extended error handler struct:
+ */
+
+struct my_error_mgr {
+ struct jpeg_error_mgr pub; /* "public" fields */
+ jmp_buf setjmp_buffer; /* for return to caller */
+};
+
+typedef struct my_error_mgr * my_error_ptr;
+
+/*
+ * Here's the routine that will replace the standard error_exit method:
+ */
+
+METHODDEF(void)
+my_error_exit (j_common_ptr cinfo) {
+ /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
+ my_error_ptr myerr = (my_error_ptr) cinfo->err;
+
+ /* Always display the message. */
+ /* We could postpone this until after returning, if we chose. */
+ (*cinfo->err->output_message) (cinfo);
+
+ /* Return control to the setjmp point */
+ longjmp(myerr->setjmp_buffer, 1);
+}
+
+
+/*
+ * Sample routine for JPEG decompression. We assume that the source file name
+ * is passed in. We want to return 1 on success, 0 on error.
+ */
+
+
+//GLOBAL(int)
+int
+gdcmFile::gdcm_read_JPEG_file12 (void * image_buffer) {
+
+char *pimage;
+
+ /* This struct contains the JPEG decompression parameters and pointers to
+ * working space (which is allocated as needed by the JPEG library).
+ */
+
+ struct jpeg_decompress_struct cinfo;
+
+ /* -------------- inside, we found :
+ JDIMENSION image_width; // input image width
+ JDIMENSION image_height; // input image height
+ int input_components; // nb of color components in input image
+ J_COLOR_SPACE in_color_space; // colorspace of input image
+ double input_gamma; // image gamma of input image
+ -------------- */
+
+ /* We use our private extension JPEG error handler.
+ * Note that this struct must live as long as the main JPEG parameter
+ * struct, to avoid dangling-pointer problems.
+ */
+ struct my_error_mgr jerr;
+ /* More stuff */
+
+ JSAMPARRAY buffer; /* Output row buffer */
+
+ // rappel :
+ // ------
+ // typedef unsigned char JSAMPLE;
+ // typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */
+ // typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */
+ // typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */
+
+
+ int row_stride; /* physical row width in output buffer */
+
+ if (DEBUG) printf("entree dans gdcmFile::gdcm_read_JPEG_file12, depuis gdcmJpeg\n");
+
+
+ /* In this example we want to open the input file before doing anything else,
+ * so that the setjmp() error recovery below can assume the file is open.
+ * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
+ * requires it in order to read binary files.
+ */
+
+ /* Step 1: allocate and initialize JPEG decompression object */
+
+ if (DEBUG)printf("Entree Step 1\n");
+
+ /* We set up the normal JPEG error routines, then override error_exit. */
+
+ cinfo.err = jpeg_std_error(&jerr.pub);
+ jerr.pub.error_exit = my_error_exit;
+
+ /* Establish the setjmp return context for my_error_exit to use. */
+
+ if (setjmp(jerr.setjmp_buffer)) {
+ /* If we get here, the JPEG code has signaled an error.
+ * We need to clean up the JPEG object, close the input file, and return.
+ */
+ jpeg_destroy_decompress(&cinfo);
+ return 0;
+ }
+ /* Now we can initialize the JPEG decompression object. */
+ jpeg_create_decompress(&cinfo);
+
+ /* Step 2: specify data source (eg, a file) */
+
+if (DEBUG) printf("Entree Step 2\n");
+
+ jpeg_stdio_src(&cinfo, fp);
+
+ /* Step 3: read file parameters with jpeg_read_header() */
+
+ if (DEBUG) printf("Entree Step 3\n");
+
+ (void) jpeg_read_header(&cinfo, TRUE);
+
+ /* We can ignore the return value from jpeg_read_header since
+ * (a) suspension is not possible with the stdio data source, and
+ * (b) we passed TRUE to reject a tables-only JPEG file as an error.
+ * See libjpeg.doc for more info.
+ */
+
+if (DEBUG) {
+ printf("--------------Header contents :----------------\n");
+ printf("image_width %d image_height %d\n",
+ cinfo.image_width , cinfo.image_height);
+ printf("bits of precision in image data %d \n",
+ cinfo.output_components);
+ printf("nb of color components returned %d \n",
+ cinfo.data_precision);
+}
+
+
+/*
+ JDIMENSION image_width; // input image width
+ JDIMENSION image_height; // input image height
+ int output_components; // # of color components returned
+ J_COLOR_SPACE in_color_space; // colorspace of input image
+ double input_gamma; // image gamma of input image
+ int data_precision; // bits of precision in image data
+
+*/
+
+ /* Step 4: set parameters for decompression */
+
+ if (DEBUG) printf("Entree Step 4\n");
+
+ /* In this example, we don't need to change any of the defaults set by
+ * jpeg_read_header(), so we do nothing here.
+ */
+
+ /* Step 5: Start decompressor */
+
+ if (DEBUG) printf("Entree Step 5\n");
+
+ (void) jpeg_start_decompress(&cinfo);
+ /* We can ignore the return value since suspension is not possible
+ * with the stdio data source.
+ */
+
+ /* We may need to do some setup of our own at this point before reading
+ * the data. After jpeg_start_decompress() we have the correct scaled
+ * output image dimensions available, as well as the output colormap
+ * if we asked for color quantization.
+ * In this example, we need to make an output work buffer of the right size.
+ */
+
+ /* JSAMPLEs per row in output buffer */
+ row_stride = cinfo.output_width * cinfo.output_components;
+
+ if (DEBUG) printf ("cinfo.output_width %d cinfo.output_components %d row_stride %d\n",
+ cinfo.output_width, cinfo.output_components,row_stride);
+
+ /* Make a one-row-high sample array that will go away when done with image */
+ buffer = (*cinfo.mem->alloc_sarray)
+ ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
+
+ /* Step 6: while (scan lines remain to be read) */
+
+ if (DEBUG) printf("Entree Step 6\n");
+
+ /* jpeg_read_scanlines(...); */
+
+ /* Here we use the library's state variable cinfo.output_scanline as the
+ * loop counter, so that we don't have to keep track ourselves.
+ */
+
+ if (DEBUG) printf ("cinfo.output_height %d cinfo.output_width %d\n",
+ cinfo.output_height,cinfo.output_width);
+
+ pimage=(char *)image_buffer;
+
+ while (cinfo.output_scanline < cinfo.output_height) {
+ /* jpeg_read_scanlines expects an array of pointers to scanlines.
+ * Here the array is only one element long, but you could ask for
+ * more than one scanline at a time if that's more convenient.
+ */
+
+ (void) jpeg_read_scanlines(&cinfo, buffer, 1);
+
+ if ( BITS_IN_JSAMPLE == 8) {
+ memcpy( pimage, buffer[0],row_stride);
+ pimage+=row_stride;
+ } else {
+ memcpy( pimage, buffer[0],row_stride*2 ); // FIXME : *2 car 16 bits?!?
+ pimage+=row_stride*2; // FIXME : *2 car 16 bits?!?
+ }
+ }
+
+ /* Step 7: Finish decompression */
+
+if (DEBUG) printf("Entree Step 7\n");
+
+ (void) jpeg_finish_decompress(&cinfo);
+ /* We can ignore the return value since suspension is not possible
+ * with the stdio data source.
+ */
+
+ /* Step 8: Release JPEG decompression object */
+
+if (DEBUG) printf("Entree Step 8\n");
+
+ /* This is an important step since it will release a good deal of memory. */
+
+ jpeg_destroy_decompress(&cinfo);
+
+ /* After finish_decompress, we can close the input file.
+ * Here we postpone it until after no more JPEG errors are possible,
+ * so as to simplify the setjmp error logic above. (Actually, I don't
+ * think that jpeg_destroy can do an error exit, but why assume anything...)
+ */
+
+ /* At this point you may want to check to see whether any corrupt-data
+ * warnings occurred (test whether jerr.pub.num_warnings is nonzero).
+ */
+
+ /* And we're done! */
+
+ return 1;
+}
+
+/*
+ * SOME FINE POINTS:
+ *
+ * In the above code, we ignored the return value of jpeg_read_scanlines,
+ * which is the number of scanlines actually read. We could get away with
+ * this because we asked for only one line at a time and we weren't using
+ * a suspending data source. See libjpeg.doc for more info.
+ *
+ * We cheated a bit by calling alloc_sarray() after jpeg_start_decompress();
+ * we should have done it beforehand to ensure that the space would be
+ * counted against the JPEG max_memory setting. In some systems the above
+ * code would risk an out-of-memory error. However, in general we don't
+ * know the output image dimensions before jpeg_start_decompress(), unless we
+ * call jpeg_calc_output_dimensions(). See libjpeg.doc for more about this.
+ *
+ * Scanlines are returned in the same order as they appear in the JPEG file,
+ * which is standardly top-to-bottom. If you must emit data bottom-to-top,
+ * you can use one of the virtual arrays provided by the JPEG memory manager
+ * to invert the data. See wrbmp.c for an example.
+ *
+ * As with compression, some operating modes may require temporary files.
+ * On some systems you may need to set up a signal handler to ensure that
+ * temporary files are deleted if the program is interrupted. See libjpeg.doc.
+ */
+
+
+
+
+
+
+
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