From 558fdebfe128fc83531f2a7c0591487b21d9e899 Mon Sep 17 00:00:00 2001
From: scuri <scuri>
Date: Thu, 8 Apr 2010 13:20:05 +0000
Subject: *** empty log message ***

---
 html/examples/memfile.cpp | 125 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 html/examples/memfile.cpp

(limited to 'html')

diff --git a/html/examples/memfile.cpp b/html/examples/memfile.cpp
new file mode 100644
index 0000000..9aba419
--- /dev/null
+++ b/html/examples/memfile.cpp
@@ -0,0 +1,125 @@
+/* IM 3 sample that loads an image and saves it in a memory buffer, then saves the buffer at once.
+
+  Needs "im.lib".
+
+  Usage: memfile <input_file_name> <output_file_name> <output_format>
+
+    Example: memfile flower.jpg test.jpg JPEG
+*/
+
+#include <im.h>
+#include <im_image.h>
+#include <im_format_jp2.h>
+#include <im_binfile.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+void PrintError(int error)
+{
+  switch (error)
+  {
+  case IM_ERR_OPEN:
+    printf("Error Opening File.\n");
+    break;
+  case IM_ERR_MEM:
+    printf("Insuficient memory.\n");
+    break;
+  case IM_ERR_ACCESS:
+    printf("Error Accessing File.\n");
+    break;
+  case IM_ERR_DATA:
+    printf("Image type not Suported.\n");
+    break;
+  case IM_ERR_FORMAT:
+    printf("Invalid Format.\n");
+    break;
+  case IM_ERR_COMPRESS:
+    printf("Invalid or unsupported compression.\n");
+    break;
+  default:
+    printf("Unknown Error.\n");
+  }
+}
+
+unsigned char* GetMemBuffer(imImage* image, int *size, const char* format)
+{
+  int error = IM_ERR_NONE;
+  imFile* pMemoryFile = NULL;
+  int oldMode = imBinFileSetCurrentModule(IM_MEMFILE); 
+
+  /// This structure must exist for the lifetime of the memory file
+  imBinMemoryFileName MemFileName;
+
+  /// Setting this to null indicates that the buffer will be dynamically allocated
+  MemFileName.buffer = NULL;
+
+  /// The initial buffer size
+  MemFileName.size = 1000;
+
+  /// This constant sets the growth rate of the buffer
+  MemFileName.reallocate = 2.0f;
+
+  /// Allocate the memory file using the given format
+  pMemoryFile = imFileNew((const char*)&MemFileName, format, &error); 
+
+  /// The mode needs to be active only for the imFileOpen/imFileNew call
+  imBinFileSetCurrentModule(oldMode); 
+
+  if (!pMemoryFile)
+  {
+    if (MemFileName.buffer) free(MemFileName.buffer);
+    PrintError(error);
+    return NULL;
+  }
+
+  /// Save the imImage to the memory file
+  error = imFileSaveImage(pMemoryFile, image);
+
+  if (error == IM_ERR_NONE)
+  {
+    /// Obtain the number of bytes actually used
+    *size = imBinFileSize((imBinFile*)imFileHandle(pMemoryFile, 0));
+  }
+  else
+    PrintError(error);
+
+  /// Close the memory file now
+  imFileClose(pMemoryFile);
+
+  return MemFileName.buffer;
+}
+
+int main(int argc, char* argv[])
+{
+  if (argc < 4)
+  {
+    printf("Invalid number of arguments.\n");
+    return 0;
+  }
+
+  imFormatRegisterJP2();
+
+  // Loads the image from file
+  int error;
+  imImage* image = imFileImageLoadBitmap(argv[1], 0, &error);
+  if (!image)
+  {
+    PrintError(error);
+    return 0;
+  }
+
+  int size;
+  unsigned char* buffer = GetMemBuffer(image, &size, argv[3]);
+  if (buffer)
+  {
+    imBinFile* bfile = imBinFileNew(argv[2]);
+    imBinFileWrite(bfile, buffer, size, 1);
+    imBinFileClose(bfile);
+    free(buffer);
+  }
+
+  imImageDestroy(image);
+
+  return 1;
+}
-- 
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