Bridge: Added File I/O

libraries/Bridge/Bridge.cpp

@@ -101,6 +101,53 @@ void BridgeClass::writeCommandInput(uint8_t handle,
   transfer(cmd, 2, buff, size, NULL, 0);
 }
 
+uint8_t BridgeClass::fileOpen(String &file, uint8_t mode, uint8_t &err) {
+  uint8_t cmd[] = {'F', mode};
+  uint8_t res[2];
+  transfer(cmd, 2, (uint8_t*)file.c_str(), file.length(), res, 2);
+  err = res[0];
+  return res[1];
+}
+
+void BridgeClass::fileClose(uint8_t handle) {
+  uint8_t cmd[] = {'f', handle};
+  transfer(cmd, 2);
+}
+
+unsigned int BridgeClass::fileRead(uint8_t handle, uint8_t *buff, unsigned int size, uint8_t &err) {
+  uint8_t s = size > 255 ? 255 : size-1;
+  uint8_t cmd[] = {'G', handle, s};
+  uint8_t l = transfer(cmd, 3, buff, size) - 1;
+  err = buff[0]; // First byte is error code
+  if (l>0) {
+    // Shift the reminder of buffer
+    for (uint8_t i=0; i<l; i++)
+      buff[i] = buff[i+1];
+  }
+  return l;
+}
+
+void BridgeClass::fileWrite(uint8_t handle, const uint8_t *buff, unsigned int size, uint8_t &err) {
+  uint8_t cmd[] = {'g', handle};
+  uint8_t res[1];
+  transfer(cmd, 2, buff, size, res, 1);
+  err = res[0];
+}
+
+void BridgeClass::fileSeek(uint8_t handle, uint32_t position, uint8_t &err) {
+  uint8_t cmd[] = {
+    's',
+    handle,
+    (position >> 24) & 0xFF,
+    (position >> 16) & 0xFF,
+    (position >> 8) & 0xFF,
+    position & 0xFF
+  };
+  uint8_t res[1];
+  transfer(cmd, 6, res, 1);
+  err = res[0];
+}
+
 unsigned int BridgeClass::readMessage(uint8_t *buff, unsigned int size) {
   uint8_t tmp[] = { 'm' };
   return transfer(tmp, 1, buff, size);

libraries/Bridge/Bridge.h

@@ -42,6 +42,20 @@ public:
   void writeCommandInput(uint8_t handle, const char *buff, unsigned int size)
     { writeCommandInput(handle, reinterpret_cast<const uint8_t *>(buff), size); }
   
+  // Methods to handle files
+  uint8_t fileOpen(String &file, uint8_t mode, uint8_t &err);
+  void fileClose(uint8_t handle);
+
+  unsigned int fileRead(uint8_t handle, uint8_t *buff, unsigned int size, uint8_t &err);
+  unsigned int fileRead(uint8_t handle, char *buff, unsigned int size, uint8_t &err)
+    { return fileRead(handle, reinterpret_cast<uint8_t *>(buff), size, err); }
+
+  void fileWrite(uint8_t handle, const uint8_t *buff, unsigned int size, uint8_t &err);
+  void fileWrite(uint8_t handle, const char *buff, unsigned int size, uint8_t &err)
+    { fileWrite(handle, reinterpret_cast<const uint8_t *>(buff), size, err); }
+
+  void fileSeek(uint8_t handle, uint32_t position, uint8_t &err);
+
   // Methods to handle mailbox messages
   unsigned int readMessage(uint8_t *buffer, unsigned int size);
   void writeMessage(const uint8_t *buffer, unsigned int size);

libraries/Bridge/FileIO.cpp

@@ -18,13 +18,18 @@
 
 #include <FileIO.h>
 
-File::File() : mode(255), filename(NULL) {
+File::File(BridgeClass &b) : mode(255), bridge(b) {
   // Empty
 }
 
-File::File(const char *_filename, uint8_t _mode) : mode(_mode) {
+File::File(const char *_filename, uint8_t _mode, BridgeClass &b) : mode(_mode), bridge(b) {
-  filename = new char[strlen(_filename)+1];
+  filename = _filename;
-  strcpy(filename, _filename);
+  uint8_t err;
+  char modes[] = {'r','w','a'};
+  handle = bridge.fileOpen(filename, modes[mode], err);
+  if (err != 0)
+    mode = 255; // In case of error keep the file closed
+  buffered = 0;
 }
 
 File::operator bool() {
@@ -32,69 +37,80 @@ File::operator bool() {
 }
 
 File::~File() {
-  if (filename)
+  close();
-    delete[] filename;
-}
-
-char toHex(uint8_t c) {
-  if (c<10)
-    return '0' + c;
-  else
-    return 'A' + c - 10;
 }
 
 size_t File::write(uint8_t c) {
-  Process echo;
+  return write(&c, 1);
-  echo.begin("arduino-append");
-  echo.addParameter(filename);
-  char chars[] = { '\\', 'x', toHex(c >> 4), toHex(c & 0x0F), '\0' };
-  echo.addParameter(chars);
-  echo.run();
-  return 1;
 }
 
 size_t File::write(const uint8_t *buf, size_t size) {
-  Process echo;
+  if (mode == 255)
-  echo.begin("arduino-append");
+	return -1;
-  echo.addParameter(filename);
+  uint8_t err;
-  echo.addParameter(" \"", true);
+  bridge.fileWrite(handle, buf, size, err);
-  for (unsigned int i=0; i<size; i++) {
+  if (err != 0)
-    // slow but requires less memory
+	return -err;
-    char c = buf[i];
-    char chars[] = { '\\', 'x', toHex(c >> 4), toHex(c & 0x0F), '\0' };
-    echo.addParameter(chars, true);
-  }
-  echo.addParameter("\"", true);
-  echo.run();
   return size;
 }
 
 int File::read() {
-  return 1;
+  doBuffer();
+  if (buffered == 0)
+    return -1; // no chars available
+  else {
+    buffered--;
+    return buffer[readPos++];
+  }
 }
 
 int File::peek() {
-  return 1;
+  doBuffer();
+  if (buffered == 0)
+    return -1; // no chars available
+  else
+    return buffer[readPos];
+}
+
+boolean File::seek(uint32_t pos) {
+  uint8_t err;
+  bridge.fileSeek(handle, pos, err);
+  return err==0;
+}
+
+void File::doBuffer() {
+  // If there are already char in buffer exit
+  if (buffered > 0)
+    return;
+
+  // Try to buffer up to 32 characters
+  readPos = 0;
+  uint8_t err;
+  buffered = bridge.fileRead(handle, buffer, sizeof(buffer), err);
 }
 
 int File::available() {
-  return 1;
+  // Look if there is new data available
+  doBuffer();
+  return buffered;
 }
 
 void File::flush() {
 }
 
 //int read(void *buf, uint16_t nbyte)
-//boolean seek(uint32_t pos)
 //uint32_t position()
 //uint32_t size()
 
 void File::close() {
+  if (mode == 255)
+    return;
+  bridge.fileClose(handle);
   mode = 255;
 }
 
-char *File::name() {
+const char *File::name() {
-  return filename;
+  return filename.c_str();
 }
 
 //boolean isDirectory(void)
@@ -111,19 +127,14 @@ boolean SDClass::begin() {
 }
 
 File SDClass::open(const char *filename, uint8_t mode) {
-  if (mode == FILE_READ) {
+//  if (mode == FILE_READ) {
-    if (exists(filename))
+//    if (exists(filename))
+//      return File(filename, mode);
+//  }
+//  if (mode == FILE_WRITE || mode == FILE_APPEND) {
     return File(filename, mode);
-  }
+//  }
-  if (mode == FILE_WRITE) {
+//  return File();
-    Process touch;
-    touch.begin(">");
-    touch.addParameter(filename);
-    int res = touch.run();
-    if (res == 0)
-      return File(filename, mode);
-  }
-  return File();
 }
 
 boolean SDClass::exists(const char *filepath) {

libraries/Bridge/FileIO.h

@@ -16,8 +16,8 @@
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
-#ifndef __SD_H__
+#ifndef __FILEIO_H__
-#define __SD_H__
+#define __FILEIO_H__
 
 #include <Process.h>
 
@@ -26,12 +26,13 @@
 
 #define FILE_READ 0
 #define FILE_WRITE 1
+#define FILE_APPEND 2
 
-class File : public Process {
+class File : public Stream {
  
 public:
-  File();
+  File(BridgeClass &b = Bridge);
-  File(const char *_filename, uint8_t _mode);
+  File(const char *_filename, uint8_t _mode, BridgeClass &b = Bridge);
   ~File();
   
   virtual size_t write(uint8_t);
@@ -46,7 +47,7 @@ public:
   uint32_t size();
   void close();
   operator bool();
-  char * name();
+  const char * name();
 
   boolean isDirectory(void);
   //File openNextFile(uint8_t mode = O_RDONLY);
@@ -55,8 +56,17 @@ public:
   using Print::write;
 
 private:
-  char *filename;
+  void doBuffer();
+  uint8_t buffered;
+  uint8_t readPos;
+  static const int BUFFER_SIZE = 64;
+  uint8_t buffer[BUFFER_SIZE];
+  
+private:
+  BridgeClass &bridge;
+  String filename;
   uint8_t mode;
+  uint8_t handle;
 };
 
 class SDClass {