All new file i/o documentation.

ppapi/c/ppb_file_io.h

Index: ppapi/c/ppb_file_io.h
===================================================================
--- ppapi/c/ppb_file_io.h	(revision 91561)
+++ ppapi/c/ppb_file_io.h	(working copy)
@@ -12,109 +12,243 @@
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/c/pp_time.h"
 
+/**
+ * @file
+ * This file defines the API to create a file i/o object.
+ */
+
 struct PP_CompletionCallback;
 struct PP_FileInfo;
 
+/**
+ * @addtogroup Enums
+ * @{
+ */
+/**
+ * The PP_FileOpenFlags enum contains file open constants.
+ */
 typedef enum {
-  // Requests read access to a file.
+  /** Requests read access to a file. */
   PP_FILEOPENFLAG_READ      = 1 << 0,
 
-  // Requests write access to a file.  May be combined with
-  // PP_FILEOPENFLAG_READ to request read and write access.
+  /**
+   * Requests write access to a file.  May be combined with
+   * <code>PP_FILEOPENFLAG_READ</code> to request read and write access.
+   */
   PP_FILEOPENFLAG_WRITE     = 1 << 1,
 
-  // Requests that the file be created if it does not exist.  If the file
-  // already exists, then this flag is ignored unless PP_FILEOPENFLAG_EXCLUSIVE
-  // was also specified, in which case FileIO::Open will fail.
+  /**
+   * Requests that the file be created if it does not exist.  If the file
+   * already exists, then this flag is ignored unless
+   * <code>PP_FILEOPENFLAG_EXCLUSIVE</code> was also specified, in which case
+   * FileIO::Open() will fail.
+   */
   PP_FILEOPENFLAG_CREATE    = 1 << 2,
 
-  // Requests that the file be truncated to length 0 if it exists and is a
-  // regular file.  PP_FILEOPENFLAG_WRITE must also be specified.
-  PP_FILEOPENFLAG_TRUNCATE  = 1 << 3,
+  /**
+   * Requests that the file be truncated to length 0 if it exists and is a
+   * regular file. <code>PP_FILEOPENFLAG_WRITE</code> must also be specified.
+   */
+   PP_FILEOPENFLAG_TRUNCATE  = 1 << 3,
 
-  // Requests that the file is created when this flag is combined with
-  // PP_FILEOPENFLAG_CREATE.  If this flag is specified, and the file already
-  // exists, then the FileIO::Open call will fail.
+  /**
+   * Requests that the file is created when this flag is combined with
+   * <code>PP_FILEOPENFLAG_CREATE</code>.  If this flag is specified, and the
+   * file already exists, then the FileIO::Open() call will fail.
+   */
   PP_FILEOPENFLAG_EXCLUSIVE = 1 << 4
 } PP_FileOpenFlags;
 PP_COMPILE_ASSERT_SIZE_IN_BYTES(PP_FileOpenFlags, 4);
+/**
+ * @}
+ */
 
 #define PPB_FILEIO_INTERFACE_0_5 "PPB_FileIO;0.5"
 #define PPB_FILEIO_INTERFACE PPB_FILEIO_INTERFACE_0_5
 
-// Use this interface to operate on a regular file (PP_FileType_Regular).
+/**
+ * @addtogroup Structs
+ * @{
+ */
+/**
+ * The <code>PPB_FileIO</code> struct is used to operate on a regular file
+ * (PP_FileType_Regular).
+ */
 struct PPB_FileIO {
-  // Creates a new FileIO object.  Returns 0 if the module is invalid.
+  /**
+   * Create() creates a new FileIO object.
+   *
+   * @param[in] instance A <code>PP_Instance</code> indentifying the instance
+   * with the file.
+   *
+   * @return A <code>PP_Resource</code> corresponding to a FileIO if
+   * successful or 0 if the module is invalid.
+   */
   PP_Resource (*Create)(PP_Instance instance);
-
-  // Returns PP_TRUE if the given resource is a FileIO. Returns PP_FALSE if the
-  // resource is invalid or some type other than a FileIO.
+  /**
+   * IsFileIO() determines if the provided resource is a FileIO.
+   *
+   * @param[in] resource A <code>PP_Resource</code> corresponding to a FileIO.
+   *
+   * @return <code>PP_TRUE</code> if the resource is a
+   * <code>PPB_FileIO</code>, <code>PP_FALSE</code> if the resource is
+   * invalid or some type other than <code>PPB_FileIO</code>.
+   */
   PP_Bool (*IsFileIO)(PP_Resource resource);
 
-  // Open the specified regular file for I/O according to the given open flags,
-  // which is a bit-mask of the PP_FileOpenFlags values.  Upon success, the
-  // corresponding file is classified as "in use" by this FileIO object until
-  // such time as the FileIO object is closed or destroyed.
+  /**
+   * Open() opens the specified regular file for I/O according to the given
+   * open flags, which is a bit-mask of the <code>PP_FileOpenFlags</code>
+   * values. Upon success, the corresponding file is classified as "in use"
+   * by this FileIO object until such time as the FileIO object is closed
+   * or destroyed.
+   *
+   * @param[in] file_io A <code>PP_Resource</code> corresponding to a
+   * FileIO.
+   * @param[in] file_ref A <code>PP_Resource</code> corresponding to a file
+   * reference.
+   * @param[in] open_flags A bit-mask of the <code>PP_FileOpenFlags</code>
+   * values.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion of Open().
+   *
+   * @return An int32_t containing an error code from <code>pp_errors.h</code>.
+   */
   int32_t (*Open)(PP_Resource file_io,
                   PP_Resource file_ref,
                   int32_t open_flags,
                   struct PP_CompletionCallback callback);
 
-  // Queries info about the file opened by this FileIO object.  Fails if the
-  // FileIO object has not been opened.
+  /**
+   * Query() queries info about the file opened by this FileIO object. This
+   * function will fail if the FileIO object has not been opened.
+   *
+   * @param[in] file_io A <code>PP_Resource</code> corresponding to a
+   * FileIO.
+   * @param[in] info The <code>PP_FileInfo</code> structure representing all
+   * information about the file.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion of Query().
+   *
+   * @return An int32_t containing an error code from <code>pp_errors.h</code>.
+   */
   int32_t (*Query)(PP_Resource file_io,
                    struct PP_FileInfo* info,
                    struct PP_CompletionCallback callback);
 
-  // Updates timestamps for the file opened by this FileIO object.  Fails if
-  // the FileIO object has not been opened.
+   /**
+    * Touch() Updates time stamps for the file opened by this FileIO object.
+    * This function will fail if the FileIO object has not been opened.
+    *
+    * @param[in] file_io A <code>PP_Resource</code> corresponding to a file
+    * FileIO.
+    * @param[in] last_access_time The last time the FileIO was accessed.
+    * @param[in] last_modified_time The last time the FileIO was modified.
+    * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+    * completion of Touch().
+    *
+    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
+    */
   int32_t (*Touch)(PP_Resource file_io,
                    PP_Time last_access_time,
                    PP_Time last_modified_time,
                    struct PP_CompletionCallback callback);
 
-  // Read from an offset in the file.  The size of the buffer must be large
-  // enough to hold the specified number of bytes to read.  May perform a
-  // partial read.  Returns the number of bytes read or an error code.  If the
-  // return value is 0, then it indicates that end-of-file was reached.  It is
-  // valid to call Read multiple times with a completion callback to queue up
-  // parallel reads from the file at different offsets.
+  /**
+   * Read() reads from an offset in the file.  The size of the buffer must be
+   * large enough to hold the specified number of bytes to read.  This function
+   * might perform a partial read.
+   *
+   * @param[in] file_io A <code>PP_Resource</code> corresponding to a file
+   * FileIO.
+   * @param[in] offset The offset into the file.
+   * @param[in] buffer The buffer to hold the specified number of bytes read.
+   * @param[in] bytes_to_read The number of bytes to read from
+   * <code>offset</code>.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion of Read().
+   *
+   * @return An The number of bytes read an error code from
+   * <code>pp_errors.h</code>. If the return value is 0, then end-of-file was
+   * reached. It is valid to call Read() multiple times with a completion
+   * callback to queue up parallel reads from the file at different offsets.
+   */
   int32_t (*Read)(PP_Resource file_io,
                   int64_t offset,
                   char* buffer,
                   int32_t bytes_to_read,
                   struct PP_CompletionCallback callback);
 
-  // Write to an offset in the file.  May perform a partial write.  Returns the
-  // number of bytes written or an error code.  It is valid to call Write
-  // multiple times with a completion callback to queue up parallel writes to
-  // the file at different offsets.  The FileIO object must have been opened
-  // with write access.
+  /**
+   * Write() writes to an offset in the file.  This function might perform a
+   * partial write. The FileIO object must have been opened with write access.
+   *
+   * @param[in] file_io A <code>PP_Resource</code> corresponding to a file
+   * FileIO.
+   * @param[in] offset The offset into the file.
+   * @param[in] buffer The buffer to hold the specified number of bytes read.
+   * @param[in] bytes_to_write The number of bytes to write to
+   * <code>offset</code>.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion of Write().
+   *
+   * @return An The number of bytes written or an error code from
+   * <code>pp_errors.h</code>. If the return value is 0, then end-of-file was
+   * reached. It is valid to call Write() multiple times with a completion
+   * callback to queue up parallel writes to the file at different offsets.
+   */
   int32_t (*Write)(PP_Resource file_io,
                    int64_t offset,
                    const char* buffer,
                    int32_t bytes_to_write,
                    struct PP_CompletionCallback callback);
-
-  // Sets the length of the file.  If the file size is extended, then the
-  // extended area of the file is zero-filled.  The FileIO object must have
-  // been opened with write access.
+  /**
+   * SetLength() sets the length of the file.  If the file size is extended,
+   * then the extended area of the file is zero-filled.  The FileIO object must
+   * have been opened with write access.
+   *
+   * @param[in] file_io A <code>PP_Resource</code> corresponding to a file
+   * FileIO.
+   * @param[in] length The length of the file to be set.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion of SetLength().
+   *
+   * @return An int32_t containing an error code from <code>pp_errors.h</code>.
+   */
   int32_t (*SetLength)(PP_Resource file_io,
                        int64_t length,
                        struct PP_CompletionCallback callback);
 
-  // Flush changes to disk.  This call can be very expensive!
+  /**
+   * Flush() flushes changes to disk.  This call can be very expensive!
+   *
+   * @param[in] file_io A <code>PP_Resource</code> corresponding to a file
+   * FileIO.
+   * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
+   * completion of Flush().
+   *
+   * @return An int32_t containing an error code from <code>pp_errors.h</code>.
+   */
   int32_t (*Flush)(PP_Resource file_io,
                    struct PP_CompletionCallback callback);
 
-  // Cancels any IO that may be pending, and closes the FileIO object.  Any
-  // pending callbacks will still run, reporting PP_Error_Aborted if pending IO
-  // was interrupted.  It is NOT valid to call Open again after a call to this
-  // method.  Note: If the FileIO object is destroyed, and it is still open,
-  // then it will be implicitly closed, so you are not required to call the
-  // Close method.
+  /**
+   * Close() cancels any IO that may be pending, and closes the FileIO object.
+   * Any pending callbacks will still run, reporting
+   * <code>PP_Error_Aborted</code> if pending IO was interrupted.  It is not
+   * valid to call Open() again after a call to this method.
+   * <strong>Note:</strong> If the FileIO object is destroyed, and it is still
+   * open, then it will be implicitly closed, so you are not required to call
+   * Close().
+   *
+   * @param[in] file_io A <code>PP_Resource</code> corresponding to a file
+   * FileIO.
+   */
   void (*Close)(PP_Resource file_io);
 };
+/**
+ * @}
+ */
 
 #endif  /* PPAPI_C_PPB_FILE_IO_H_ */