git-svn-id: https://profuse.googlecode.com/svn/branches/v2@179 aa027e90-d47c-11dd-86d7-074df07e0730

Pascal/TextFile.cpp

@@ -0,0 +1,92 @@
+
+
+
+class TextFile {
+
+public:
+
+
+    unsigned size() const;
+    
+    unsigned read(void *buffer, unsigned size, unsigned offset);
+
+
+private:
+
+    static unsigned decodeBlock(uint8_t *in, unsigned inSize, uint8_t *out);
+
+    unsigned _size;
+    std::vector<unsigned> _pageSize
+};
+
+
+unsigned decodeBlock(uint8_t *in, unsigned inSize, uint8_t *out)
+{
+    const unsigned DLE = 16;
+    
+    unsigned size = 0;
+    
+    for (unsigned i = 0; i < inSize; ++i)
+    {
+        uint8_t c = in[i];
+        if (!c) break;
+
+        if ((c == DLE) && (i + 1 < inSize))
+        {
+            unsigned x = in[++i] - 32;
+            
+            if (out)
+            {
+                for (unsigned i = 0; i < x; ++i)
+                    *out++ = ' ';
+            }
+            size += x;    
+        }
+        else
+        {
+            if (out) *out++ = c;
+            ++size;
+        }
+
+
+    }
+    
+    return size;
+}
+
+
+{
+
+    // first 2 blocks are header information
+    
+    _fileSize = 0;
+    
+    unsigned pages = (_endBlock - _startBlock - 2) >> 1
+    uint8_t buffer[1024];
+    unsigned offset = 0;
+    
+    for (unsigned i _startBlock + 2; i <= _endBlock; i += 2)
+    {
+        uint8_t buffer[1024];
+        unsigned dataSize = 0;
+        unsigned offset = 0;
+        unsigned size;
+        
+        // load a 2-block page.
+        for (j = i; j <= _endBlock; ++j)
+        {
+            _device->readBlock(j, buffer + offset);
+            dataSize += j == _endBlock ? _lastByte : 512;
+        
+        }
+
+        size = decodeBlock(buffer, dataSize, NULL);
+        
+        _pageSize.push_back(size);
+        _fileSize += size;
+    }
+
+
+}
+
+