From 5f4a9bf681f9360dc6485cb34108b7fd0bb43c02 Mon Sep 17 00:00:00 2001
From: Kurt <kurt.w.jung@gmail.com>
Date: Mon, 1 Aug 2016 16:24:32 -0400
Subject: Check for error in ghostscript example

---
 fpdf.go | 183 ----------------------------------------------------------------
 1 file changed, 183 deletions(-)

(limited to 'fpdf.go')

diff --git a/fpdf.go b/fpdf.go
index 9e6c862..c5e8e6b 100644
--- a/fpdf.go
+++ b/fpdf.go
@@ -2900,189 +2900,6 @@ func (f *Fpdf) readByte(buf *bytes.Buffer) (val byte) {
 	return
 }
 
-func (f *Fpdf) parsepngstream(buf *bytes.Buffer, readdpi bool) (info *ImageInfoType) {
-	info = f.newImageInfo()
-	// 	Check signature
-	if string(buf.Next(8)) != "\x89PNG\x0d\x0a\x1a\x0a" {
-		f.err = fmt.Errorf("not a PNG buffer")
-		return
-	}
-	// Read header chunk
-	_ = buf.Next(4)
-	if string(buf.Next(4)) != "IHDR" {
-		f.err = fmt.Errorf("incorrect PNG buffer")
-		return
-	}
-	w := f.readBeInt32(buf)
-	h := f.readBeInt32(buf)
-	bpc := f.readByte(buf)
-	if bpc > 8 {
-		f.err = fmt.Errorf("16-bit depth not supported in PNG file")
-	}
-	ct := f.readByte(buf)
-	var colspace string
-	colorVal := 1
-	switch ct {
-	case 0, 4:
-		colspace = "DeviceGray"
-	case 2, 6:
-		colspace = "DeviceRGB"
-		colorVal = 3
-	case 3:
-		colspace = "Indexed"
-	default:
-		f.err = fmt.Errorf("unknown color type in PNG buffer: %d", ct)
-	}
-	if f.err != nil {
-		return
-	}
-	if f.readByte(buf) != 0 {
-		f.err = fmt.Errorf("'unknown compression method in PNG buffer")
-		return
-	}
-	if f.readByte(buf) != 0 {
-		f.err = fmt.Errorf("'unknown filter method in PNG buffer")
-		return
-	}
-	if f.readByte(buf) != 0 {
-		f.err = fmt.Errorf("interlacing not supported in PNG buffer")
-		return
-	}
-	_ = buf.Next(4)
-	dp := sprintf("/Predictor 15 /Colors %d /BitsPerComponent %d /Columns %d", colorVal, bpc, w)
-	// Scan chunks looking for palette, transparency and image data
-	pal := make([]byte, 0, 32)
-	var trns []int
-	data := make([]byte, 0, 32)
-	loop := true
-	for loop {
-		n := int(f.readBeInt32(buf))
-		// dbg("Loop [%d]", n)
-		switch string(buf.Next(4)) {
-		case "PLTE":
-			// dbg("PLTE")
-			// Read palette
-			pal = buf.Next(n)
-			_ = buf.Next(4)
-		case "tRNS":
-			// dbg("tRNS")
-			// Read transparency info
-			t := buf.Next(n)
-			if ct == 0 {
-				trns = []int{int(t[1])} // ord(substr($t,1,1)));
-			} else if ct == 2 {
-				trns = []int{int(t[1]), int(t[3]), int(t[5])} // array(ord(substr($t,1,1)), ord(substr($t,3,1)), ord(substr($t,5,1)));
-			} else {
-				pos := strings.Index(string(t), "\x00")
-				if pos >= 0 {
-					trns = []int{pos} // array($pos);
-				}
-			}
-			_ = buf.Next(4)
-		case "IDAT":
-			// dbg("IDAT")
-			// Read image data block
-			data = append(data, buf.Next(n)...)
-			_ = buf.Next(4)
-		case "IEND":
-			// dbg("IEND")
-			loop = false
-		case "pHYs":
-			// dbg("pHYs")
-			// png files theoretically support different x/y dpi
-			// but we ignore files like this
-			// but if they're the same then we can stamp our info
-			// object with it
-			x := int(f.readBeInt32(buf))
-			y := int(f.readBeInt32(buf))
-			units := buf.Next(1)[0]
-			// fmt.Printf("got a pHYs block, x=%d, y=%d, u=%d, readdpi=%t\n",
-			// x, y, int(units), readdpi)
-			// only modify the info block if the user wants us to
-			if x == y && readdpi {
-				switch units {
-				// if units is 1 then measurement is px/meter
-				case 1:
-					info.dpi = float64(x) / 39.3701 // inches per meter
-				default:
-					info.dpi = float64(x)
-				}
-			}
-			_ = buf.Next(4)
-		default:
-			// dbg("default")
-			_ = buf.Next(n + 4)
-		}
-		if loop {
-			loop = n > 0
-		}
-	}
-	if colspace == "Indexed" && len(pal) == 0 {
-		f.err = fmt.Errorf("missing palette in PNG buffer")
-	}
-	info.w = float64(w)
-	info.h = float64(h)
-	info.cs = colspace
-	info.bpc = int(bpc)
-	info.f = "FlateDecode"
-	info.dp = dp
-	info.pal = pal
-	info.trns = trns
-	// dbg("ct [%d]", ct)
-	if ct >= 4 {
-		// Separate alpha and color channels
-		var err error
-		data, err = sliceUncompress(data)
-		if err != nil {
-			f.err = err
-			return
-		}
-		var color, alpha bytes.Buffer
-		if ct == 4 {
-			// Gray image
-			width := int(w)
-			height := int(h)
-			length := 2 * width
-			var pos, elPos int
-			for i := 0; i < height; i++ {
-				pos = (1 + length) * i
-				color.WriteByte(data[pos])
-				alpha.WriteByte(data[pos])
-				elPos = pos + 1
-				for k := 0; k < width; k++ {
-					color.WriteByte(data[elPos])
-					alpha.WriteByte(data[elPos+1])
-					elPos += 2
-				}
-			}
-		} else {
-			// RGB image
-			width := int(w)
-			height := int(h)
-			length := 4 * width
-			var pos, elPos int
-			for i := 0; i < height; i++ {
-				pos = (1 + length) * i
-				color.WriteByte(data[pos])
-				alpha.WriteByte(data[pos])
-				elPos = pos + 1
-				for k := 0; k < width; k++ {
-					color.Write(data[elPos : elPos+3])
-					alpha.WriteByte(data[elPos+3])
-					elPos += 4
-				}
-			}
-		}
-		data = sliceCompress(color.Bytes())
-		info.smask = sliceCompress(alpha.Bytes())
-		if f.pdfVersion < "1.4" {
-			f.pdfVersion = "1.4"
-		}
-	}
-	info.data = data
-	return
-}
-
 // Extract info from a GIF data (via PNG conversion)
 func (f *Fpdf) parsegif(r io.Reader) (info *ImageInfoType) {
 	data, err := bufferFromReader(r)
-- 
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