1 files changed, 107 insertions, 0 deletions
diff --git a/src/bitmap.c b/src/bitmap.c
new file mode 100644
index 0000000..2c7fdb5
--- /dev/null
+++ b/src/bitmap.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2013 DENSO CORPORATION
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission.  The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#include "bitmap.h"
+#include <stdio.h>
+
+struct __attribute__ ((__packed__)) BITMAPFILEHEADER {
+    char bfType[2];
+    uint32_t bfSize;
+    uint16_t bfReserved1;
+    uint16_t bfReserved2;
+    uint32_t bfOffBits;
+};
+
+struct __attribute__ ((__packed__)) BITMAPINFOHEADER {
+    uint32_t biSize;
+    uint32_t biWidth;
+    uint32_t biHeight;
+    uint16_t biPlanes;
+    uint16_t biBitCount;
+    uint32_t biCompression;
+    uint32_t biSizeImage;
+    uint32_t biXPixPerMeter;
+    uint32_t biYPixPerMeter;
+    uint32_t biClrUsed;
+    uint32_t biClrImporant;
+};
+
+static void
+create_file_header(struct BITMAPFILEHEADER *file_header, int32_t image_size)
+{
+    file_header->bfType[0] = 'B';
+    file_header->bfType[1] = 'M';
+    file_header->bfSize    = sizeof(struct BITMAPFILEHEADER)
+                           + sizeof(struct BITMAPINFOHEADER)
+                           + image_size;
+    file_header->bfOffBits = sizeof(struct BITMAPFILEHEADER)
+                           + sizeof(struct BITMAPINFOHEADER);
+}
+
+static void
+create_info_header(struct BITMAPINFOHEADER *info_header, int32_t image_size, int32_t width, int32_t height, int16_t bpp)
+{
+    info_header->biSize      = sizeof(struct BITMAPINFOHEADER);
+    info_header->biWidth     = width;
+    info_header->biHeight    = height;
+    info_header->biPlanes    = 1;
+    info_header->biBitCount  = bpp;
+    info_header->biSizeImage = image_size;
+}
+
+static int
+write_bitmap(const char *filename,
+             const struct BITMAPFILEHEADER *file_header,
+             const struct BITMAPINFOHEADER *info_header,
+             const char *buffer)
+{
+    FILE *fp = fopen(filename, "w");
+    if (fp == NULL) {
+        return -1;
+    }
+
+    fwrite(file_header, sizeof(struct BITMAPFILEHEADER), 1, fp);
+    fwrite(info_header, sizeof(struct BITMAPINFOHEADER), 1, fp);
+    fwrite(buffer, info_header->biSizeImage, 1, fp);
+
+    fclose(fp);
+    return 0;
+}
+
+int
+save_as_bitmap(const char *filename,
+               const char *buffer,
+               int32_t image_size,
+               int32_t width,
+               int32_t height,
+               int16_t bpp)
+{
+    if ((filename == NULL) || (buffer == NULL)) {
+        return -1;
+    }
+
+    struct BITMAPFILEHEADER file_header = {};
+    struct BITMAPINFOHEADER info_header = {};
+
+    create_file_header(&file_header, image_size);
+    create_info_header(&info_header, image_size, width, height, bpp);
+    return write_bitmap(filename, &file_header, &info_header, buffer);
+}