added g2c_ versions of png and openjpeg enc/dec functions (#545)

* added g2c_ functions with int inputs for png and openjpeg enc/dec functions

* fixing some inputs

* debug

* debug

* Update tst_png.c

* debugging

* debugging casting pointers

* debug

* debugging

* more pointer debugging

* more debug

* Update decenc_png.c

* applying requested changes

src/decenc_openjpeg.c

@@ -236,6 +236,33 @@ opj_stream_create_default_memory_stream(opj_memory_stream *memoryStream, OPJ_BOO
     return stream;
 }
 
+/**
+ * This Function decodes a JPEG2000 code stream specified in the
+ * JPEG2000 Part-1 standard (i.e., ISO/IEC 15444-1) using OpenJPEG.
+ *
+ * PROGRAM HISTORY LOG:
+ * - 2002-12-02  Gilbert
+ * - 2016-06-08  Jovic
+ *
+ * @param injpc Input JPEG2000 code stream.
+ * @param bufsize Length (in bytes) of the input JPEG2000 code stream.
+ * @param outfld Output matrix of grayscale image values.
+ *
+ * @return
+ * - 0 Successful decode
+ * - -3 Error decode jpeg2000 code stream.
+ * - -5 decoded image had multiple color components. Only grayscale is expected.
+ *
+ * @note Requires OpenJPEG Version 2.
+ *
+ * @author Alyson Stahl
+ */
+int
+g2c_dec_jpeg2000(char *injpc, size_t bufsize, int *outfld)
+{
+    return dec_jpeg2000(injpc, bufsize, (g2int *)outfld);
+}
+
 /**
  * This Function decodes a JPEG2000 code stream specified in the
  * JPEG2000 Part-1 standard (i.e., ISO/IEC 15444-1) using OpenJPEG.
@@ -342,6 +369,51 @@ dec_jpeg2000(char *injpc, g2int bufsize, g2int *outfld)
     return iret;
 }
 
+/**
+ * This Function encodes a grayscale image into a JPEG2000 code stream
+ * specified in the JPEG2000 Part-1 standard (i.e., ISO/IEC 15444-1)
+ * using OpenJPEG library.
+ *
+ * PROGRAM HISTORY LOG:
+ * - 2002-12-02  Gilbert
+ * - 2016-06-08  Jovic
+ *
+ * @param cin Packed matrix of Grayscale image values to encode.
+ * @param width width of image
+ * @param height height of image
+ * @param nbits depth (in bits) of image.i.e number of bits used to
+ * hold each data value
+ * @param ltype indicator of lossless or lossy compression = 1, for
+ * lossy compression != 1, for lossless compression.
+ * @param ratio target compression ratio.  (ratio:1) Used only when
+ * ltype == 1.
+ * @param retry Pointer to option type. 1 = try increasing number of
+ * guard bits otherwise, no additional options.
+ * @param outjpc Output encoded JPEG2000 code stream.
+ * @param jpclen Number of bytes allocated for new JPEG2000 code
+ * stream in outjpc.
+ *
+ * @return
+ * - > 0 Length in bytes of encoded JPEG2000 code stream
+ * - -3 Error decode jpeg2000 code stream.
+ * - -5 decoded image had multiple color components. Only grayscale is expected.
+ *
+ * @note Requires OpenJPEG Version 2.
+ *
+ * @author Alyson Stahl
+ */
+int
+g2c_enc_jpeg2000(unsigned char *cin, int width, int height, int nbits,
+                 int ltype, int ratio, int retry, char *outjpc,
+                 size_t jpclen)
+{
+    g2int width8 = width, height8 = height, nbits8 = nbits, ltype8 = ltype;
+    g2int ratio8 = ratio, retry8 = retry, jpclen8 = jpclen;
+
+    return enc_jpeg2000(cin, width8, height8, nbits8, ltype8, ratio8, retry8,
+                        outjpc, jpclen8);
+}
+
 /**
  * This Function encodes a grayscale image into a JPEG2000 code stream
  * specified in the JPEG2000 Part-1 standard (i.e., ISO/IEC 15444-1)

src/decenc_png.c

@@ -84,6 +84,25 @@ user_flush_data(png_structp png_ptr)
 {
 }
 
+/**
+ * Decode PNG.
+ *
+ * @param pngbuf Pointer to PNG buffer.
+ * @param width Pointer to width.
+ * @param height Pointer to height.
+ * @param cout Output buffer.
+ *
+ * @return 0 for success, error code otherwise.
+ *
+ * @author Alyson Stahl
+ */
+int
+g2c_dec_png(unsigned char *pngbuf, int *width, int *height,
+            unsigned char *cout)
+{
+    return dec_png(pngbuf, (g2int *)&width, (g2int *)&height, cout);
+}
+
 /**
  * Decode PNG.
  *
@@ -190,6 +209,28 @@ dec_png(unsigned char *pngbuf, g2int *width, g2int *height,
     return 0;
 }
 
+/**
+ * Encode PNG.
+ *
+ * @param data data.
+ * @param width width.
+ * @param height height.
+ * @param nbits number of bits.
+ * @param pngbuf PNG buffer.
+ *
+ * @return PNG length, or negative number for error.
+ *
+ * @author Alyson Stahl
+ */
+int
+g2c_enc_png(unsigned char *data, int width, int height, int nbits,
+            unsigned char *pngbuf)
+{
+    g2int width8 = width, height8 = height, nbits8 = nbits;
+
+    return enc_png(data, width8, height8, nbits8, pngbuf);
+}
+
 /**
  * Encode PNG.
  *

src/grib2.h.in

@@ -376,6 +376,10 @@ int g2c_enc_jpeg2000(unsigned char *cin, int width, int height, int nbits,
                      int ltype, int ratio, int retry, char *outjpc,
                      size_t jpclen);
 int g2c_dec_jpeg2000(char *injpc, size_t bufsize, int *outfld);
+int g2c_enc_png(unsigned char *data, int width, int height, int nbits,
+                unsigned char *pngbuf);
+int g2c_dec_png(unsigned char *pngbuf, int *width, int *height,
+                unsigned char *cout);
 int g2c_aecpackf(float *fld, size_t width, size_t height, int *idrstmpl,
                  unsigned char *cpack, size_t *lcpack);
 int g2c_aecpackd(double *fld, size_t width, size_t height, int *idrstmpl,

tests/tst_png.c

@@ -44,6 +44,34 @@ main()
                 return G2C_ERROR;
     }
     printf("ok!\n");
+    printf("Testing g2c_enc_png()/g2c_dec_png() calls...");
+    {
+        unsigned char data[4] = {1, 2, 3, 4};
+        int width = 1, height = 1, nbits = 32;
+        int width_in, height_in;
+        unsigned char pngbuf[200];
+        unsigned char cout[200];
+        int i, ret;
+
+        /* Encode some data. */
+        if ((ret = g2c_enc_png(data, width, height, nbits, pngbuf)) != 70)
+        {
+            printf("%d\n", ret);
+            return G2C_ERROR;
+        }
+
+        /* Now decode it. */
+        if ((ret = g2c_dec_png((unsigned char *)pngbuf, &width_in, &height_in, cout)))
+        {
+            printf("%d\n", ret);
+            return G2C_ERROR;
+        }
+
+        for (i = 0; i < 4; i++)
+            if (cout[i] != data[i])
+                return G2C_ERROR;
+    }
+    printf("ok!\n");
     printf("Testing pngpack()/pngunpack() calls...");
     {
         g2int height = 2, width = 2, ndpts = DATA_LEN, len = PACKED_LEN;