dmlib: dmres.c comparison

Implement fwrite and fputc in memio resources. They will only operate on pre-allocated memory area, thus not grow-as-write.

author	Matti Hamalainen <ccr@tnsp.org>
date	Sun, 04 Nov 2012 03:18:42 +0200
parents	3d9c044ec08d
children	b60220fd1669

comparison

equal deleted inserted replaced

-:c1f6def0c1da
+:bc1da1f4cb4b
 static int dm_mem_fgetc(DMResource * f)
 {
 // Check for EOF
 if ((size_t) f->dataOffset < f->dataSize)
-return (int) f->data[f->dataOffset++];
+return f->data[f->dataOffset++];
 else
 return EOF;
 }
 memcpy(buf, f->data + f->dataOffset, length);
 f->dataOffset += length;
 return nmemb;
 }
+static int dm_mem_fputc(int ch, DMResource * f)
+{
+// Check for EOF
+if ((size_t) f->dataOffset < f->dataSize)
+{
+f->data[f->dataOffset++] = ch;
+return ch;
+}
+else
+return EOF;
+}
+static size_t dm_mem_fwrite(void *buf, size_t size, size_t nmemb, DMResource * f)
+{
+size_t length = (size * nmemb);
+// Check if we can write the whole chunk
+if (((size_t) f->dataOffset + length) >= f->dataSize)
+{
+nmemb = (f->dataSize - f->dataOffset) / size;
+length = size * nmemb;
+}
+if (length > 0)
+{
+memcpy(f->data + f->dataOffset, buf, length);
+f->dataOffset += length;
+}
+return nmemb;
+}
 #ifdef DM_USE_PACKFS
 DMResourceOps dfPackFileOps =
 {
 dm_mem_fseek,
 dm_mem_fsize,
 dm_mem_ftell,
 dm_mem_feof,
 dm_mem_fgetc,
-NULL,
+dm_mem_fputc,
 dm_mem_fread,
-NULL,
+dm_mem_fwrite,
 NULL,
 NULL,
 NULL
 };

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