Rename png_filter -> predictors

1 files changed, 91 insertions, 0 deletions

diff --git a/libtests/predictors.cc b/libtests/predictors.cc
new file mode 100644
index 00000000..fe2b90f4
--- /dev/null
+++ b/libtests/predictors.cc
@@ -0,0 +1,91 @@
+#include <qpdf/Pl_PNGFilter.hh>
+#include <qpdf/Pl_StdioFile.hh>
+#include <qpdf/QUtil.hh>
+
+#include <iostream>
+#include <errno.h>
+#include <assert.h>
+#include <string.h>
+#include <stdlib.h>
+
+void run(char const* filename, char const* filter,
+         bool encode, unsigned int columns,
+         int bits_per_sample, int samples_per_pixel)
+{
+    FILE* in = QUtil::safe_fopen(filename, "rb");
+    FILE* o1 = QUtil::safe_fopen("out", "wb");
+    Pipeline* out = new Pl_StdioFile("out", o1);
+    Pipeline* pl = 0;
+    if (strcmp(filter, "png") == 0)
+    {
+        pl = new Pl_PNGFilter(
+            "png", out,
+            encode ? Pl_PNGFilter::a_encode : Pl_PNGFilter::a_decode,
+            columns, samples_per_pixel, bits_per_sample);
+    }
+    else
+    {
+        std::cerr << "unknown filter " << filter << std::endl;
+        exit(2);
+    }
+    assert((2 * (columns + 1)) < 1024);
+    unsigned char buf[1024];
+    size_t len;
+    while (true)
+    {
+	len = fread(buf, 1, (2 * columns) + 1, in);
+	if (len == 0)
+	{
+	    break;
+	}
+	pl->write(buf, len);
+	len = fread(buf, 1, 1, in);
+	if (len == 0)
+	{
+	    break;
+	}
+	pl->write(buf, len);
+	len = fread(buf, 1, 1, in);
+	if (len == 0)
+	{
+	    break;
+	}
+	pl->write(buf, len);
+    }
+
+    pl->finish();
+    delete pl;
+    delete out;
+    fclose(o1);
+    fclose(in);
+
+    std::cout << "done" << std::endl;
+}
+
+int main(int argc, char* argv[])
+{
+    if (argc != 7)
+    {
+	std::cerr << "Usage: predictor {png|tiff} {en,de}code filename"
+                  << " columns samples-per-pixel bits-per-sample"
+                  << std::endl;
+	exit(2);
+    }
+    char* filter = argv[1];
+    bool encode = (strcmp(argv[2], "encode") == 0);
+    char* filename = argv[3];
+    int columns = QUtil::string_to_int(argv[4]);
+    int samples_per_pixel = QUtil::string_to_int(argv[5]);
+    int bits_per_sample = QUtil::string_to_int(argv[6]);
+
+    try
+    {
+	run(filename, filter, encode,
+            columns, bits_per_sample, samples_per_pixel);
+    }
+    catch (std::exception& e)
+    {
+	std::cout << e.what() << std::endl;
+    }
+    return 0;
+}