hxing

1 files changed, 545 insertions, 0 deletions

diff --git a/src/util/bio.c b/src/util/bio.c
new file mode 100644
index 000000000..060b6f94b
--- /dev/null
+++ b/src/util/bio.c
@@ -0,0 +1,545 @@
+/*
+     This file is part of GNUnet.
+     (C) 2006, 2009 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 2, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+
+/**
+ * @file util/bio.c
+ * @brief functions for buffering IO
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_bio_lib.h"
+
+
+/**
+ * Handle for buffered reading.
+ */
+struct GNUNET_BIO_ReadHandle
+{
+};
+
+
+/**
+ * Open a file for reading.
+ *
+ * @param fn file name to be opened
+ * @return IO handle on success, NULL on error
+ */
+struct GNUNET_BIO_ReadHandle *GNUNET_BIO_read_open (const char *fn)
+{
+  return NULL;
+}
+
+
+/**
+ * Close an open file.  Reports if any errors reading
+ * from the file were encountered.
+ *
+ * @param h file handle
+ * @param emsg set to the error message
+ * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
+ */
+int GNUNET_BIO_read_close (struct GNUNET_BIO_ReadHandle *h,
+                           char **emsg)
+{
+  return GNUNET_SYSERR;
+}
+
+
+/**
+ * Read the contents of a binary file into a buffer.
+ *
+ * @param h handle to an open file
+ * @param what describes what is being read (for error message creation)
+ * @param result the buffer to write the result to
+ * @param len the number of bytes to read
+ * @return len on success, GNUNET_SYSERR on failure
+ */
+ssize_t GNUNET_BIO_read (struct GNUNET_BIO_ReadHandle *h, 
+                         const char *what,
+                         void *result, 
+                         size_t len)
+{
+}
+
+
+/**
+ * Read 0-terminated string from a file.
+ *
+ * @param h handle to an open file
+ * @param what describes what is being read (for error message creation)
+ * @param result the buffer to store a pointer to the (allocated) string to
+ *        (note that *result could be set to NULL as well)
+ * @return GNUNET_OK on success, GNUNET_SYSERR on failure
+ */
+int GNUNET_BIO_read_string (struct GNUNET_BIO_ReadHandle *h, 
+                            const char *what,
+                            char **result)
+{
+}
+
+
+/**
+ * Read metadata container from a file.
+ *
+ * @param h handle to an open file
+ * @param what describes what is being read (for error message creation)
+ * @param result the buffer to store a pointer to the (allocated) metadata
+ * @return GNUNET_OK on success, GNUNET_SYSERR on failure
+ */
+int GNUNET_BIO_read_meta_data (struct GNUNET_BIO_ReadHandle *h, 
+                               const char *what,
+                               struct GNUNET_CONTAINER_MetaData **result)
+{
+}
+
+
+/**
+ * Read an (u)int32_t.
+ *
+ * @param h hande to open file
+ * @param what describes what is being read (for error message creation)
+ * @param i address of 32-bit integer to read
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */ 
+int GNUNET_BIO_read_int32__ (struct GNUNET_BIO_ReadHandle *h, 
+                             const char *what,
+                             int32_t *i);
+
+
+/**
+ * Read an (u)int64_t.
+ *
+ * @param h hande to open file
+ * @param what describes what is being read (for error message creation)
+ * @param i address of 64-bit integer to read
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */ 
+int GNUNET_BIO_read_int64__ (struct GNUNET_BIO_ReadHandle *h, 
+                             const char *what,
+                             int64_t *i);
+
+/**
+ * Handle for buffered writing.
+ */
+struct GNUNET_BIO_WriteHandle
+{
+};
+
+
+/**
+ * Open a file for writing.
+ *
+ * @param fn file name to be opened
+ * @return IO handle on success, NULL on error
+ */
+struct GNUNET_BIO_WriteHandle *GNUNET_BIO_write_open (const char *fn)
+{
+  return NULL;
+}
+
+
+/**
+ * Close an open file for writing.
+ *
+ * @param h file handle
+ * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
+ */
+int GNUNET_BIO_write_close (struct GNUNET_BIO_WriteHandle *h);
+
+
+/**
+ * Write a buffer to a file.
+ *
+ * @param h handle to open file
+ * @param buffer the data to write
+ * @param n number of bytes to write
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */
+ssize_t GNUNET_BIO_write (struct GNUNET_BIO_WriteHandle *h, 
+                          const void *buffer,
+                          size_t n);
+
+
+/**
+ * Write a string to a file.
+ *
+ * @param h handle to open file
+ * @param s string to write (can be NULL)
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */
+int GNUNET_BIO_write_string (struct GNUNET_BIO_WriteHandle *h, 
+                             const char *s);
+
+
+
+
+/**
+ * Write metadata container to a file.
+ *
+ * @param h handle to open file
+ * @param m metadata to write
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */
+int GNUNET_BIO_write_meta_data (struct GNUNET_BIO_WriteHandle *h, 
+                                const struct GNUNET_CONTAINER_MetaData *m);
+
+
+
+/**
+ * Write a float.
+ *
+ * @param h hande to open file
+ * @param f float to write (must be a variable)
+ */ 
+#define GNUNET_BIO_write_float(h, f) (sizeof(float) == GNUNET_BIO_write (h, &f, sizeof(float)))
+
+
+
+/**
+ * Write a double.
+ *
+ * @param h hande to open file
+ * @param f double to write (must be a variable)
+ */ 
+#define GNUNET_BIO_write_float(h, f) (sizeof(double) == GNUNET_BIO_write (h, &f, sizeof(double)))
+
+
+/**
+ * Write an (u)int32_t.
+ *
+ * @param h hande to open file
+ * @param i address of 32-bit integer to write
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */ 
+int GNUNET_BIO_write_int32 (struct GNUNET_BIO_ReadHandle *h, 
+                            int32_t i);
+
+
+/**
+ * Write an (u)int64_t.
+ *
+ * @param h hande to open file
+ * @param i address of 64-bit integer to write
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */ 
+int GNUNET_BIO_write_int64 (struct GNUNET_BIO_ReadHandle *h, 
+                            int64_t i);
+
+
+
+
+
+typedef struct
+{
+  int fd;
+  unsigned int have;
+  unsigned int size;
+  char *buffer;
+} WriteBuffer;
+
+static void
+write_buffered (WriteBuffer * wb, const void *s, unsigned int size)
+{
+  const char *src = s;
+  unsigned int min;
+  unsigned int pos;
+  int ret;
+
+  if (wb->fd == -1)
+    return;
+  pos = 0;
+  do
+    {
+      /* first, just use buffer */
+      min = wb->size - wb->have;
+      if (min > size - pos)
+        min = size - pos;
+      memcpy (&wb->buffer[wb->have], &src[pos], min);
+      pos += min;
+      wb->have += min;
+      if (pos == size)
+        return;                 /* done */
+      GNUNET_GE_ASSERT (NULL, wb->have == wb->size);
+      ret = WRITE (wb->fd, wb->buffer, wb->size);
+      if (ret != wb->size)
+        {
+          CLOSE (wb->fd);
+          wb->fd = -1;
+          return;               /* error */
+        }
+      wb->have = 0;
+    }
+  while (pos < size);           /* should always be true */
+}
+
+
+static void
+WRITEINT (WriteBuffer * wb, int val)
+{
+  int big;
+  big = htonl (val);
+  write_buffered (wb, &big, sizeof (int));
+}
+
+static void
+WRITELONG (WriteBuffer * wb, long long val)
+{
+  long long big;
+  big = GNUNET_htonll (val);
+  write_buffered (wb, &big, sizeof (long long));
+}
+
+static void
+writeURI (WriteBuffer * wb, const struct GNUNET_ECRS_URI *uri)
+{
+  char *buf;
+  unsigned int size;
+
+  buf = GNUNET_ECRS_uri_to_string (uri);
+  size = strlen (buf);
+  WRITEINT (wb, size);
+  write_buffered (wb, buf, size);
+  GNUNET_free (buf);
+}
+
+static void
+WRITESTRING (WriteBuffer * wb, const char *name)
+{
+  GNUNET_GE_BREAK (NULL, name != NULL);
+  WRITEINT (wb, strlen (name));
+  write_buffered (wb, name, strlen (name));
+}
+
+static void
+writeMetaData (struct GNUNET_GE_Context *ectx,
+               WriteBuffer * wb, const struct GNUNET_MetaData *meta)
+{
+  unsigned int size;
+  char *buf;
+
+  size = GNUNET_meta_data_get_serialized_size (meta,
+                                               GNUNET_SERIALIZE_FULL
+                                               |
+                                               GNUNET_SERIALIZE_NO_COMPRESS);
+  if (size > 1024 * 1024)
+    size = 1024 * 1024;
+  buf = GNUNET_malloc (size);
+  GNUNET_meta_data_serialize (ectx,
+                              meta,
+                              buf,
+                              size,
+                              GNUNET_SERIALIZE_PART |
+                              GNUNET_SERIALIZE_NO_COMPRESS);
+  WRITEINT (wb, size);
+  write_buffered (wb, buf, size);
+  GNUNET_free (buf);
+}
+
+
+static void
+writeFileInfo (struct GNUNET_GE_Context *ectx, WriteBuffer * wb,
+               const GNUNET_ECRS_FileInfo * fi)
+{
+  writeMetaData (ectx, wb, fi->meta);
+  writeURI (wb, fi->uri);
+}
+
+
+
+
+typedef struct
+{
+  int fd;
+  unsigned int have;
+  unsigned int size;
+  unsigned int pos;
+  char *buffer;
+} ReadBuffer;
+
+static int
+read_buffered (ReadBuffer * rb, void *d, unsigned int size)
+{
+  char *dst = d;
+  unsigned int min;
+  unsigned int pos;
+  int ret;
+
+  if (rb->fd == -1)
+    return -1;
+  pos = 0;
+  do
+    {
+      /* first, use buffer */
+      min = rb->have - rb->pos;
+      if (min > 0)
+        {
+          if (min > size - pos)
+            min = size - pos;
+          memcpy (&dst[pos], &rb->buffer[rb->pos], min);
+          rb->pos += min;
+          pos += min;
+        }
+      if (pos == size)
+        return pos;             /* done! */
+      GNUNET_GE_ASSERT (NULL, rb->have == rb->pos);
+      /* fill buffer */
+      ret = READ (rb->fd, rb->buffer, rb->size);
+      if (ret == -1)
+        {
+          CLOSE (rb->fd);
+          rb->fd = -1;
+          return -1;
+        }
+      if (ret == 0)
+        return 0;
+      rb->pos = 0;
+      rb->have = ret;
+    }
+  while (pos < size);           /* should always be true */
+  return pos;
+}
+
+
+static int
+read_int (ReadBuffer * rb, int *val)
+{
+  int big;
+
+  if (sizeof (int) != read_buffered (rb, &big, sizeof (int)))
+    return GNUNET_SYSERR;
+  *val = ntohl (big);
+  return GNUNET_OK;
+}
+
+static unsigned int
+read_uint (ReadBuffer * rb, unsigned int *val)
+{
+  unsigned int big;
+
+  if (sizeof (unsigned int) !=
+      read_buffered (rb, &big, sizeof (unsigned int)))
+    return GNUNET_SYSERR;
+  *val = ntohl (big);
+  return GNUNET_OK;
+}
+
+#define READINT(a) if (GNUNET_OK != read_int(rb, (int*) &a)) return GNUNET_SYSERR;
+
+static int
+read_long (ReadBuffer * rb, long long *val)
+{
+  long long big;
+
+  if (sizeof (long long) != read_buffered (rb, &big, sizeof (long long)))
+    return GNUNET_SYSERR;
+  *val = GNUNET_ntohll (big);
+  return GNUNET_OK;
+}
+
+#define READLONG(a) if (GNUNET_OK != read_long(rb, (long long*) &a)) return GNUNET_SYSERR;
+
+static struct GNUNET_ECRS_URI *
+read_uri (struct GNUNET_GE_Context *ectx, ReadBuffer * rb)
+{
+  char *buf;
+  struct GNUNET_ECRS_URI *ret;
+  unsigned int size;
+
+  if (GNUNET_OK != read_uint (rb, &size))
+    return NULL;
+  buf = GNUNET_malloc (size + 1);
+  buf[size] = '\0';
+  if (size != read_buffered (rb, buf, size))
+    {
+      GNUNET_free (buf);
+      return NULL;
+    }
+  ret = GNUNET_ECRS_string_to_uri (ectx, buf);
+  GNUNET_GE_BREAK (ectx, ret != NULL);
+  GNUNET_free (buf);
+  return ret;
+}
+
+#define READURI(u) if (NULL == (u = read_uri(ectx, rb))) return GNUNET_SYSERR;
+
+static char *
+read_string (ReadBuffer * rb, unsigned int maxLen)
+{
+  char *buf;
+  unsigned int big;
+
+  if (GNUNET_OK != read_uint (rb, &big))
+    return NULL;
+  if (big > maxLen)
+    return NULL;
+  buf = GNUNET_malloc (big + 1);
+  buf[big] = '\0';
+  if (big != read_buffered (rb, buf, big))
+    {
+      GNUNET_free (buf);
+      return NULL;
+    }
+  return buf;
+}
+
+#define READSTRING(c, max) if (NULL == (c = read_string(rb, max))) return GNUNET_SYSERR;
+
+/**
+ * Read file info from file.
+ *
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */
+static struct GNUNET_MetaData *
+read_meta (struct GNUNET_GE_Context *ectx, ReadBuffer * rb)
+{
+  unsigned int size;
+  char *buf;
+  struct GNUNET_MetaData *meta;
+
+  if (read_uint (rb, &size) != GNUNET_OK)
+    {
+      GNUNET_GE_BREAK (ectx, 0);
+      return NULL;
+    }
+  if (size > 1024 * 1024)
+    {
+      GNUNET_GE_BREAK (ectx, 0);
+      return NULL;
+    }
+  buf = GNUNET_malloc (size);
+  if (size != read_buffered (rb, buf, size))
+    {
+      GNUNET_free (buf);
+      GNUNET_GE_BREAK (ectx, 0);
+      return NULL;
+    }
+  meta = GNUNET_meta_data_deserialize (ectx, buf, size);
+  if (meta == NULL)
+    {
+      GNUNET_free (buf);
+      GNUNET_GE_BREAK (ectx, 0);
+      return NULL;
+    }
+  GNUNET_free (buf);
+  return meta;
+}
+
+/* end of bio.c */