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// $Id: Blob_Handler.cpp 93539 2011-03-13 09:40:44Z vzykov $
#include "Blob_Handler.h"
#include "ace/OS_NS_stdio.h"
#include "ace/OS_NS_string.h"
#include "ace/OS_NS_strings.h"
// Empty constructor for compliance with new Connector behavior.
ACE_Blob_Handler::ACE_Blob_Handler (void)
{
}
// Always use this constructor
ACE_Blob_Handler::ACE_Blob_Handler (ACE_Message_Block * mb,
size_t length,
size_t offset,
ACE_TCHAR *filename) :
mb_ (mb),
length_ (length),
offset_ (offset),
filename_ (ACE_OS::strdup (filename)),
bytecount_ (0)
{
}
ACE_Blob_Handler::~ACE_Blob_Handler (void)
{
if (filename_)
{
ACE_OS::free ((void *) filename_);
filename_ = 0;
}
}
// Called by Connector after connection is established
int
ACE_Blob_Handler::open (void *)
{
if (this->send_request () != 0)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "ACE_Blob_Handler::open():send_request failed"), -1);
if (this->receive_reply () != 0)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "ACE_Blob_Handler::open():receive_reply failed"), -1);
return 0;
}
// No-op
int
ACE_Blob_Handler::close (u_long flags)
{
ACE_UNUSED_ARG (flags);
return 0;
}
// Always overridden by the derived classes
int
ACE_Blob_Handler::send_request (void)
{
return -1;
}
// Always overridden by the derived classes
int
ACE_Blob_Handler::receive_reply (void)
{
return -1;
}
// used to retrieve the number of bytes read/written by the
// last operation on the Blob
int
ACE_Blob_Handler::byte_count (void)
{
return bytecount_;
}
// Reader **************************************************
ACE_Blob_Reader::ACE_Blob_Reader (ACE_Message_Block * mb,
size_t length,
size_t offset,
ACE_TCHAR *filename,
const char *request_prefix,
const char *request_suffix) :
ACE_Blob_Handler (mb, length, offset, filename),
request_prefix_ (request_prefix),
request_suffix_ (request_suffix)
{
}
// Send the HTTP request
int
ACE_Blob_Reader::send_request (void)
{
char mesg [MAX_HEADER_SIZE];
// Check to see if the request is too big
if (MAX_HEADER_SIZE < (ACE_OS::strlen (request_prefix_)
+ ACE_OS::strlen (filename_)
+ ACE_OS::strlen (request_suffix_) + 4))
ACE_ERROR_RETURN((LM_ERROR,"Request too large!"), -1);
// Create a message to send to the server requesting retrieval of the file
int len = ACE_OS::sprintf (mesg, "%s %s %s",
request_prefix_,
ACE_TEXT_ALWAYS_CHAR (filename_),
request_suffix_);
// Send the message to server
if (peer ().send_n (mesg, len) != len)
ACE_ERROR_RETURN((LM_ERROR,"Error sending request"), -1);
return 0;
}
// Recieve the HTTP Reply
int
ACE_Blob_Reader::receive_reply (void)
{
ssize_t len;
char buf [MAX_HEADER_SIZE + 1];
char *buf_ptr;
size_t bytes_read = 0;
size_t bytes_left = this->length_;
size_t offset_left = this->offset_;
// Receive the first MAX_HEADER_SIZE bytes to be able to strip off the
// header. Note that we assume that the header will fit into the
// first MAX_HEADER_SIZE bytes of the transmitted data.
if ((len = peer ().recv_n (buf, MAX_HEADER_SIZE)) >= 0)
{
buf[len] = '\0';
// Search for the header termination string "\r\n\r\n", or "\n\n". If
// found, move past it to get to the data portion.
if ((buf_ptr = ACE_OS::strstr (buf,"\r\n\r\n")) != 0)
buf_ptr += 4;
else if ((buf_ptr = ACE_OS::strstr (buf, "\n\n")) != 0)
buf_ptr += 2;
else
buf_ptr = buf;
// Determine number of data bytes read. This is equal to the
// total bytes read minus number of header bytes.
bytes_read = (buf + len) - buf_ptr;
}
else
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "ACE_Blob_Reader::receiveReply():Error while reading header"), -1);
// ***************************************************************
// At this point, we have stripped off the header and are ready to
// process data. buf_ptr points to the data
// First adjust for offset. There are two cases:
// (1) The first block of data encountered the offset. In this case
// we simply increment the buf_ptr by offset.
// (2) The first block of data did not encounter the offset. That
// is, the offset needs to go past the number of data bytes already read.
if (bytes_read > offset_left)
{
// The first case is true -- that is offset is less than the
// data bytes we just read.
buf_ptr += offset_left;
// Determine how many data bytes are actually there. This is
// basically the total number of data bytes we read minus any
// offset we have.
size_t data_bytes = bytes_read - offset_left;
// Check for the case where the bytes read are enough to fulfill
// our request (for length bytes). If this is the case, then we
// don't need to do any extra recvs and can simply return with
// the data.
if (data_bytes >= bytes_left)
{
// The first block contains enough data to satisfy the
// length. So copy the data into the message buffer.
if (mb_->copy (buf_ptr, bytes_left) == -1)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n",
"ACE Blob_Reader::receiveReply():Error copying data into Message_Block"), -1);
bytecount_ = length_;
return 0;
}
// Copy over all the data bytes into our message buffer.
if (mb_->copy (buf_ptr, data_bytes) == -1)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n",
"ACE_Blob_Reader::receiveReply():Error copying data into Message_Block" ), -1);
// Adjust bytes left
bytes_left -= data_bytes;
// No more offset left. So set it to zero.
offset_left = 0;
}
else
{
// The second case is true -- that is offset is greater than
// the data bytes we just read.
offset_left -= bytes_read;
}
// If we ad any offset left, take care of that.
while (offset_left > 0)
{
// MAX_HEADER_SIZE in which case we should do a receive of
// offset bytes into a temporary buffer. Otherwise, we should
// receive MAX_HEADER_SIZE bytes into temporary buffer and
// decrement offset_left.
if (offset_left < (sizeof buf))
len = offset_left;
else
len = sizeof buf;
if (peer().recv_n (buf, len) != len)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n",
"ACE_Blob_Reader::receiveReply():Read error" ),
-1);
offset_left -= len;
}
// *****************************************************************
// At this point we are all set to receive the actual data which the
// user wants. We have made adjustments for offset and are ready to
// receive the actual data. Receive the data directly into the
// message buffer.
len = peer().recv_n (mb_->wr_ptr (), bytes_left);
if (len < 0 || static_cast<size_t> (len) != bytes_left)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n",
"ACE_Blob_Reader::receiveReply():Read error" ),
-1);
// Adjust the message buffer write pointer by number of bytes we
// received.
mb_->wr_ptr (len);
// Set the byte count to number of bytes received
this->bytecount_ = length_;
return 0;
}
// Writer **************************************************
ACE_Blob_Writer::ACE_Blob_Writer (ACE_Message_Block * mb,
size_t length,
size_t offset,
ACE_TCHAR *filename,
const char *request_prefix,
const char *request_suffix) :
ACE_Blob_Handler (mb, length, offset, filename),
request_prefix_ (request_prefix),
request_suffix_ (request_suffix)
{
}
int
ACE_Blob_Writer::send_request (void)
{
// Check for sanity -- check if we have any data to send.
if (offset_+ length_ > mb_->length ())
ACE_ERROR_RETURN((LM_ERROR, "%p\n",
"ACE_Blob_Writer::sendRequest():Invalid offset/length"), -1);
// Determine the length of the header message we will be sending to
// the server. Note that we add 32 for safety -- this corresponds to
// the number of bytes needed for the length field.
size_t mesglen =
ACE_OS::strlen (request_prefix_)
+ ACE_OS::strlen (filename_)
+ ACE_OS::strlen (request_suffix_)
+ 32; // safety
// Allocate a buffer to hold the header
char *mesg = 0;
ACE_NEW_RETURN (mesg, char [mesglen], -1);
// Create the header, store the actual length in mesglen.
mesglen = ACE_OS::sprintf (mesg, "%s /%s %s " ACE_SIZE_T_FORMAT_SPECIFIER_ASCII "\n\n",
request_prefix_, ACE_TEXT_ALWAYS_CHAR (filename_),
request_suffix_, length_);
// Send the header followed by the data
// First send the header
if (peer ().send_n (mesg, mesglen) == -1)
ACE_ERROR_RETURN((LM_ERROR, "%p\n", "Error sending request"), -1);
// "Consume" the offset by moving the read pointer of the message
// buffer
mb_->rd_ptr (offset_);
// Now send the data
if (peer ().send_n (mb_->rd_ptr (), length_) != (int)length_)
ACE_ERROR_RETURN((LM_ERROR, "%p\n", "Error sending file"), -1);
// Adjust the read pointer of the mesage buffer
mb_->rd_ptr (length_);
return 0;
}
int
ACE_Blob_Writer::receive_reply (void)
{
// Allocate a buffer big enough to hold the header
char buf[MAX_HEADER_SIZE];
// Receive the reply from the server
size_t num_recvd = 0;
ssize_t len = peer ().recv_n (buf, sizeof buf - 1, 0, &num_recvd); // reserve one byte to store the \0
if (len ==-1)
ACE_ERROR_RETURN((LM_ERROR, "%p\n", "Error reading header"), -1);
buf [num_recvd] = 0;
// Parse the header
char *lasts = 0;
// First check if this was a valid header -- HTTP/1.0
char *token = ACE_OS::strtok_r (buf, " \t", &lasts);
if ( (token == 0) || (ACE_OS::strcasecmp (token, "HTTP/1.0") != 0))
ACE_ERROR_RETURN((LM_ERROR, "%p\n", "Did not receive a HTTP/1.0 response"), -1);
// Get the return code.
int return_code = ACE_OS::atoi (ACE_OS::strtok_r (0, " \t", &lasts));
// Check if the transaction succeeded. The only success codes are in
// the range of 200-299 (HTTP specification).
if (return_code >= 200 && return_code < 300)
return 0;
else
{
// Something went wrong!
// Get the description from the header message of what went wrong.
char *description = ACE_OS::strtok_r (0, "\n\r", &lasts);
ACE_ERROR_RETURN((LM_ERROR, "%p\n", description), -1);
}
ACE_NOTREACHED(return 0);
}
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