+//-----------------------------------------------------------------------------
+/*
+ * 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(bool)
+bool gdcmFile::gdcm_read_JPEG_file (FILE *fp,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_file, 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