Imported from libpng-0.96.tar
diff --git a/pngset.c b/pngset.c
new file mode 100644
index 0000000..b079164
--- /dev/null
+++ b/pngset.c
@@ -0,0 +1,312 @@
+
+/* pngset.c - storage of image information into info struct
+
+ libpng 1.0 beta 6 - version 0.96
+ For conditions of distribution and use, see copyright notice in png.h
+ Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+ Copyright (c) 1996, 1997 Andreas Dilger
+ May 12, 1997
+ */
+
+#define PNG_INTERNAL
+#include "png.h"
+
+#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
+void
+png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
+{
+ png_debug1(1, "in %s storage function\n", "bKGD");
+ if (info_ptr == NULL)
+ return;
+
+ png_memcpy(&(info_ptr->background), background, sizeof(png_color_16));
+ info_ptr->valid |= PNG_INFO_bKGD;
+}
+#endif
+
+#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
+void
+png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
+ double white_x, double white_y, double red_x, double red_y,
+ double green_x, double green_y, double blue_x, double blue_y)
+{
+ png_debug1(1, "in %s storage function\n", "cHRM");
+ if (info_ptr == NULL)
+ return;
+
+ info_ptr->x_white = (float)white_x;
+ info_ptr->y_white = (float)white_y;
+ info_ptr->x_red = (float)red_x;
+ info_ptr->y_red = (float)red_y;
+ info_ptr->x_green = (float)green_x;
+ info_ptr->y_green = (float)green_y;
+ info_ptr->x_blue = (float)blue_x;
+ info_ptr->y_blue = (float)blue_y;
+ info_ptr->valid |= PNG_INFO_cHRM;
+}
+#endif
+
+#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
+void
+png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
+{
+ png_debug1(1, "in %s storage function\n", "gAMA");
+ if (info_ptr == NULL)
+ return;
+
+ info_ptr->gamma = (float)file_gamma;
+ info_ptr->valid |= PNG_INFO_gAMA;
+}
+#endif
+
+#if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
+void
+png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
+{
+ png_debug1(1, "in %s storage function\n", "hIST");
+ if (info_ptr == NULL)
+ return;
+
+ info_ptr->hist = hist;
+ info_ptr->valid |= PNG_INFO_hIST;
+}
+#endif
+
+void
+png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 width, png_uint_32 height, int bit_depth,
+ int color_type, int interlace_type, int compression_type,
+ int filter_type)
+{
+ png_debug1(1, "in %s storage function\n", "IHDR");
+ if (info_ptr == NULL)
+ return;
+
+ info_ptr->width = width;
+ info_ptr->height = height;
+ info_ptr->bit_depth = (png_byte)bit_depth;
+ info_ptr->color_type =(png_byte) color_type;
+ info_ptr->compression_type = (png_byte)compression_type;
+ info_ptr->filter_type = (png_byte)filter_type;
+ info_ptr->interlace_type = (png_byte)interlace_type;
+ if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+ info_ptr->channels = 1;
+ else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR)
+ info_ptr->channels = 3;
+ else
+ info_ptr->channels = 1;
+ if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA)
+ info_ptr->channels++;
+ info_ptr->pixel_depth = (png_byte)(info_ptr->channels * info_ptr->bit_depth);
+ info_ptr->rowbytes = ((info_ptr->width * info_ptr->pixel_depth + 7) >> 3);
+}
+
+#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
+void
+png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 offset_x, png_uint_32 offset_y, int unit_type)
+{
+ png_debug1(1, "in %s storage function\n", "oFFs");
+ if (info_ptr == NULL)
+ return;
+
+ info_ptr->x_offset = offset_x;
+ info_ptr->y_offset = offset_y;
+ info_ptr->offset_unit_type = (png_byte)unit_type;
+ info_ptr->valid |= PNG_INFO_oFFs;
+}
+#endif
+
+#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED)
+void
+png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
+ png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
+ png_charp units, png_charpp params)
+{
+ png_size_t length;
+ int i;
+
+ png_debug1(1, "in %s storage function\n", "pCAL");
+ if (info_ptr == NULL)
+ return;
+
+ length = png_strlen(purpose) + 1;
+ png_debug1(3, "allocating purpose for info (%d bytes)\n", length);
+ info_ptr->pcal_purpose = (png_charp)png_malloc(png_ptr, length);
+ png_memcpy(info_ptr->pcal_purpose, purpose, length);
+
+ png_debug(3, "storing X0, X1, type, and nparams in info\n");
+ info_ptr->pcal_X0 = X0;
+ info_ptr->pcal_X1 = X1;
+ info_ptr->pcal_type = (png_byte)type;
+ info_ptr->pcal_nparams = (png_byte)nparams;
+
+ length = png_strlen(units) + 1;
+ png_debug1(3, "allocating units for info (%d bytes)\n", length);
+ info_ptr->pcal_units = (png_charp)png_malloc(png_ptr, length);
+ png_memcpy(info_ptr->pcal_units, units, length);
+
+ info_ptr->pcal_params = (png_charpp)png_malloc(png_ptr,
+ (nparams + 1) * sizeof(png_charp));
+ info_ptr->pcal_params[nparams] = NULL;
+
+ for (i = 0; i < nparams; i++)
+ {
+ length = png_strlen(params[i]) + 1;
+ png_debug2(3, "allocating parameter %d for info (%d bytes)\n", i, length);
+ info_ptr->pcal_params[i] = (png_charp)png_malloc(png_ptr, length);
+ png_memcpy(info_ptr->pcal_params[i], params[i], length);
+ }
+
+ info_ptr->valid |= PNG_INFO_pCAL;
+}
+#endif
+
+#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
+void
+png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 res_x, png_uint_32 res_y, int unit_type)
+{
+ png_debug1(1, "in %s storage function\n", "pHYs");
+ if (info_ptr == NULL)
+ return;
+
+ info_ptr->x_pixels_per_unit = res_x;
+ info_ptr->y_pixels_per_unit = res_y;
+ info_ptr->phys_unit_type = (png_byte)unit_type;
+ info_ptr->valid |= PNG_INFO_pHYs;
+}
+#endif
+
+void
+png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
+ png_colorp palette, int num_palette)
+{
+ png_debug1(1, "in %s storage function\n", "PLTE");
+ if (info_ptr == NULL)
+ return;
+
+ info_ptr->palette = palette;
+ info_ptr->num_palette = (png_uint_16)num_palette;
+ info_ptr->valid |= PNG_INFO_PLTE;
+}
+
+#if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
+void
+png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
+ png_color_8p sig_bit)
+{
+ png_debug1(1, "in %s storage function\n", "sBIT");
+ if (info_ptr == NULL)
+ return;
+
+ png_memcpy(&(info_ptr->sig_bit), sig_bit, sizeof (png_color_8));
+ info_ptr->valid |= PNG_INFO_sBIT;
+}
+#endif
+
+#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) || \
+ defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
+void
+png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
+ int num_text)
+{
+ int i;
+
+ png_debug1(1, "in %s storage function\n", (png_ptr->chunk_name[0] == '\0' ?
+ "text" : png_ptr->chunk_name));
+
+ if (info_ptr == NULL || num_text == 0)
+ return;
+
+ /* Make sure we have enough space in the "text" array in info_struct
+ * to hold all of the incoming text_ptr objects.
+ */
+ if (info_ptr->num_text + num_text > info_ptr->max_text)
+ {
+ if (info_ptr->text != NULL)
+ {
+ png_textp old_text;
+ int old_max;
+
+ old_max = info_ptr->max_text;
+ info_ptr->max_text = info_ptr->num_text + num_text + 8;
+ old_text = info_ptr->text;
+ info_ptr->text = (png_textp)png_malloc(png_ptr,
+ info_ptr->max_text * sizeof (png_text));
+ png_memcpy(info_ptr->text, old_text, old_max * sizeof(png_text));
+ png_free(png_ptr, old_text);
+ }
+ else
+ {
+ info_ptr->max_text = num_text + 8;
+ info_ptr->num_text = 0;
+ info_ptr->text = (png_textp)png_malloc(png_ptr,
+ info_ptr->max_text * sizeof (png_text));
+ }
+ png_debug1(3, "allocated %d entries for info_ptr->text\n",
+ info_ptr->max_text);
+ }
+
+ for (i = 0; i < num_text; i++)
+ {
+ png_textp textp = &(info_ptr->text[info_ptr->num_text]);
+
+ if (text_ptr[i].text == NULL)
+ text_ptr[i].text = "";
+
+ if (text_ptr[i].text[0] == '\0')
+ {
+ textp->text_length = 0;
+ textp->compression = PNG_TEXT_COMPRESSION_NONE;
+ }
+ else
+ {
+ textp->text_length = png_strlen(text_ptr[i].text);
+ textp->compression = text_ptr[i].compression;
+ }
+ textp->text = text_ptr[i].text;
+ textp->key = text_ptr[i].key;
+ info_ptr->num_text++;
+ png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
+ }
+}
+#endif
+
+#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
+void
+png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
+{
+ png_debug1(1, "in %s storage function\n", "tIME");
+ if (info_ptr == NULL)
+ return;
+
+ png_memcpy(&(info_ptr->mod_time), mod_time, sizeof (png_time));
+ info_ptr->valid |= PNG_INFO_tIME;
+}
+#endif
+
+#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED)
+void
+png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
+ png_bytep trans, int num_trans, png_color_16p trans_values)
+{
+ png_debug1(1, "in %s storage function\n", "tRNS");
+ if (info_ptr == NULL)
+ return;
+
+ if (trans != NULL)
+ {
+ info_ptr->trans = trans;
+ }
+
+ if (trans_values != NULL)
+ {
+ png_memcpy(&(info_ptr->trans_values), trans_values,
+ sizeof(png_color_16));
+ }
+ info_ptr->num_trans = (png_uint_16)num_trans;
+ info_ptr->valid |= PNG_INFO_tRNS;
+}
+#endif
+