diff options
Diffstat (limited to 'src/modules/extra/m_ziplink.cpp')
| -rw-r--r-- | src/modules/extra/m_ziplink.cpp | 453 |
1 files changed, 452 insertions, 1 deletions
diff --git a/src/modules/extra/m_ziplink.cpp b/src/modules/extra/m_ziplink.cpp index 2a127258d..e815d1042 100644 --- a/src/modules/extra/m_ziplink.cpp +++ b/src/modules/extra/m_ziplink.cpp @@ -1 +1,452 @@ -/* +------------------------------------+
* | Inspire Internet Relay Chat Daemon |
* +------------------------------------+
*
* InspIRCd: (C) 2002-2007 InspIRCd Development Team
* See: http://www.inspircd.org/wiki/index.php/Credits
*
* This program is free but copyrighted software; see
* the file COPYING for details.
*
* ---------------------------------------------------
*/
#include "inspircd.h"
#include <zlib.h>
#include "users.h"
#include "channels.h"
#include "modules.h"
#include "socket.h"
#include "hashcomp.h"
#include "transport.h"
/* $ModDesc: Provides zlib link support for servers */
/* $LinkerFlags: -lz */
/* $ModDep: transport.h */
/*
* Compressed data is transmitted across the link in the following format:
*
* 0 1 2 3 4 ... n
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
* | n | Z0 -> Zn |
* +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
*
* Where: n is the size of a frame, in network byte order, 4 bytes.
* Z0 through Zn are Zlib compressed data, n bytes in length.
*
* If the module fails to read the entire frame, then it will buffer
* the portion of the last frame it received, then attempt to read
* the next part of the frame next time a write notification arrives.
*
* ZLIB_BEST_COMPRESSION (9) is used for all sending of data with
* a flush after each frame. A frame may contain multiple lines
* and should be treated as raw binary data.
*
*/
/* Status of a connection */
enum izip_status { IZIP_OPEN, IZIP_CLOSED };
/* Maximum transfer size per read operation */
const unsigned int CHUNK = 128 * 1024;
/* This class manages a compressed chunk of data preceeded by
* a length count.
*
* It can handle having multiple chunks of data in the buffer
* at any time.
*/
class CountedBuffer : public classbase
{
std::string buffer; /* Current buffer contents */
unsigned int amount_expected; /* Amount of data expected */
public:
CountedBuffer()
{
amount_expected = 0;
}
/** Adds arbitrary compressed data to the buffer.
* - Binsry safe, of course.
*/
void AddData(unsigned char* data, int data_length)
{
buffer.append((const char*)data, data_length);
this->NextFrameSize();
}
/** Works out the size of the next compressed frame
*/
void NextFrameSize()
{
if ((!amount_expected) && (buffer.length() >= 4))
{
/* We have enough to read an int -
* Yes, this is safe, but its ugly. Give me
* a nicer way to read 4 bytes from a binary
* stream, and push them into a 32 bit int,
* and i'll consider replacing this.
*/
amount_expected = ntohl((buffer[3] << 24) | (buffer[2] << 16) | (buffer[1] << 8) | buffer[0]);
buffer = buffer.substr(4);
}
}
/** Gets the next frame and returns its size, or returns
* zero if there isnt one available yet.
* A frame can contain multiple plaintext lines.
* - Binary safe.
*/
int GetFrame(unsigned char* frame, int maxsize)
{
if (amount_expected)
{
/* We know how much we're expecting...
* Do we have enough yet?
*/
if (buffer.length() >= amount_expected)
{
int j = 0;
for (unsigned int i = 0; i < amount_expected; i++, j++)
frame[i] = buffer[i];
buffer = buffer.substr(j);
amount_expected = 0;
NextFrameSize();
return j;
}
}
/* Not enough for a frame yet, COME AGAIN! */
return 0;
}
};
/** Represents an zipped connections extra data
*/
class izip_session : public classbase
{
public:
z_stream c_stream; /* compression stream */
z_stream d_stream; /* decompress stream */
izip_status status; /* Connection status */
int fd; /* File descriptor */
CountedBuffer* inbuf; /* Holds input buffer */
std::string outbuf; /* Holds output buffer */
};
class ModuleZLib : public Module
{
izip_session sessions[MAX_DESCRIPTORS];
/* Used for stats z extensions */
float total_out_compressed;
float total_in_compressed;
float total_out_uncompressed;
float total_in_uncompressed;
public:
ModuleZLib(InspIRCd* Me)
: Module::Module(Me)
{
ServerInstance->PublishInterface("InspSocketHook", this);
total_out_compressed = total_in_compressed = 0;
total_out_uncompressed = total_out_uncompressed = 0;
}
virtual ~ModuleZLib()
{
ServerInstance->UnpublishInterface("InspSocketHook", this);
}
virtual Version GetVersion()
{
return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION);
}
void Implements(char* List)
{
List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = 1;
List[I_OnStats] = List[I_OnRequest] = 1;
}
/* Handle InspSocketHook API requests */
virtual char* OnRequest(Request* request)
{
ISHRequest* ISR = (ISHRequest*)request;
if (strcmp("IS_NAME", request->GetId()) == 0)
{
/* Return name */
return "zip";
}
else if (strcmp("IS_HOOK", request->GetId()) == 0)
{
/* Attach to an inspsocket */
char* ret = "OK";
try
{
ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
}
catch (ModuleException& e)
{
return NULL;
}
return ret;
}
else if (strcmp("IS_UNHOOK", request->GetId()) == 0)
{
/* Detatch from an inspsocket */
return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL;
}
else if (strcmp("IS_HSDONE", request->GetId()) == 0)
{
/* Check for completion of handshake
* (actually, this module doesnt handshake)
*/
return "OK";
}
else if (strcmp("IS_ATTACH", request->GetId()) == 0)
{
/* Attach certificate data to the inspsocket
* (this module doesnt do that, either)
*/
return NULL;
}
return NULL;
}
/* Handle stats z (misc stats) */
virtual int OnStats(char symbol, userrec* user, string_list &results)
{
if (symbol == 'z')
{
std::string sn = ServerInstance->Config->ServerName;
/* Yeah yeah, i know, floats are ew.
* We used them here because we'd be casting to float anyway to do this maths,
* and also only floating point numbers can deal with the pretty large numbers
* involved in the total throughput of a server over a large period of time.
* (we dont count 64 bit ints because not all systems have 64 bit ints, and floats
* can still hold more.
*/
float outbound_r = 100 - ((total_out_compressed / (total_out_uncompressed + 0.001)) * 100);
float inbound_r = 100 - ((total_in_compressed / (total_in_uncompressed + 0.001)) * 100);
float total_compressed = total_in_compressed + total_out_compressed;
float total_uncompressed = total_in_uncompressed + total_out_uncompressed;
float total_r = 100 - ((total_compressed / (total_uncompressed + 0.001)) * 100);
char outbound_ratio[MAXBUF], inbound_ratio[MAXBUF], combined_ratio[MAXBUF];
sprintf(outbound_ratio, "%3.2f%%", outbound_r);
sprintf(inbound_ratio, "%3.2f%%", inbound_r);
sprintf(combined_ratio, "%3.2f%%", total_r);
results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS outbound_compressed = "+ConvToStr(total_out_compressed));
results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS inbound_compressed = "+ConvToStr(total_in_compressed));
results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS outbound_uncompressed = "+ConvToStr(total_out_uncompressed));
results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS inbound_uncompressed = "+ConvToStr(total_in_uncompressed));
results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS outbound_ratio = "+outbound_ratio);
results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS inbound_ratio = "+inbound_ratio);
results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS combined_ratio = "+combined_ratio);
return 0;
}
return 0;
}
virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport)
{
izip_session* session = &sessions[fd];
/* allocate state and buffers */
session->fd = fd;
session->status = IZIP_OPEN;
session->inbuf = new CountedBuffer();
session->c_stream.zalloc = (alloc_func)0;
session->c_stream.zfree = (free_func)0;
session->c_stream.opaque = (voidpf)0;
session->d_stream.zalloc = (alloc_func)0;
session->d_stream.zfree = (free_func)0;
session->d_stream.opaque = (voidpf)0;
}
virtual void OnRawSocketConnect(int fd)
{
/* Nothing special needs doing here compared to accept() */
OnRawSocketAccept(fd, "", 0);
}
virtual void OnRawSocketClose(int fd)
{
CloseSession(&sessions[fd]);
}
virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
{
/* Find the sockets session */
izip_session* session = &sessions[fd];
if (session->status == IZIP_CLOSED)
return 0;
unsigned char compr[CHUNK + 4];
unsigned int offset = 0;
unsigned int total_size = 0;
/* Read CHUNK bytes at a time to the buffer (usually 128k) */
readresult = read(fd, compr, CHUNK);
/* Did we get anything? */
if (readresult > 0)
{
/* Add it to the frame queue */
session->inbuf->AddData(compr, readresult);
total_in_compressed += readresult;
/* Parse all completed frames */
int size = 0;
while ((size = session->inbuf->GetFrame(compr, CHUNK)) != 0)
{
session->d_stream.next_in = (Bytef*)compr;
session->d_stream.avail_in = 0;
session->d_stream.next_out = (Bytef*)(buffer + offset);
/* If we cant call this, well, we're boned. */
if (inflateInit(&session->d_stream) != Z_OK)
return 0;
while ((session->d_stream.total_out < count) && (session->d_stream.total_in < (unsigned int)size))
{
session->d_stream.avail_in = session->d_stream.avail_out = 1;
if (inflate(&session->d_stream, Z_NO_FLUSH) == Z_STREAM_END)
break;
}
/* Stick a fork in me, i'm done */
inflateEnd(&session->d_stream);
/* Update counters and offsets */
total_size += session->d_stream.total_out;
total_in_uncompressed += session->d_stream.total_out;
offset += session->d_stream.total_out;
}
/* Null-terminate the buffer -- this doesnt harm binary data */
buffer[total_size] = 0;
/* Set the read size to the correct total size */
readresult = total_size;
}
return (readresult > 0);
}
virtual int OnRawSocketWrite(int fd, const char* buffer, int count)
{
izip_session* session = &sessions[fd];
int ocount = count;
if (!count) /* Nothing to do! */
return 0;
if(session->status != IZIP_OPEN)
{
/* Seriously, wtf? */
CloseSession(session);
return 0;
}
unsigned char compr[CHUNK + 4];
/* Gentlemen, start your engines! */
if (deflateInit(&session->c_stream, Z_BEST_COMPRESSION) != Z_OK)
{
CloseSession(session);
return 0;
}
/* Set buffer sizes (we reserve 4 bytes at the start of the
* buffer for the length counters)
*/
session->c_stream.next_in = (Bytef*)buffer;
session->c_stream.next_out = compr + 4;
/* Compress the text */
while ((session->c_stream.total_in < (unsigned int)count) && (session->c_stream.total_out < CHUNK))
{
session->c_stream.avail_in = session->c_stream.avail_out = 1;
if (deflate(&session->c_stream, Z_NO_FLUSH) != Z_OK)
{
CloseSession(session);
return 0;
}
}
/* Finish the stream */
for (session->c_stream.avail_out = 1; deflate(&session->c_stream, Z_FINISH) != Z_STREAM_END; session->c_stream.avail_out = 1);
deflateEnd(&session->c_stream);
total_out_uncompressed += ocount;
total_out_compressed += session->c_stream.total_out;
/** Assemble the frame length onto the frame, in network byte order */
compr[0] = (session->c_stream.total_out >> 24);
compr[1] = (session->c_stream.total_out >> 16);
compr[2] = (session->c_stream.total_out >> 8);
compr[3] = (session->c_stream.total_out & 0xFF);
/* Add compressed data plus leading length to the output buffer -
* Note, we may have incomplete half-sent frames in here.
*/
session->outbuf.append((const char*)compr, session->c_stream.total_out + 4);
/* Lets see how much we can send out */
int ret = write(fd, session->outbuf.data(), session->outbuf.length());
/* Check for errors, and advance the buffer if any was sent */
if (ret > 0)
session->outbuf = session->outbuf.substr(ret);
else if (ret < 1)
{
if (ret == -1)
{
if (errno == EAGAIN)
return 0;
else
{
session->outbuf.clear();
return 0;
}
}
else
{
session->outbuf.clear();
return 0;
}
}
/* ALL LIES the lot of it, we havent really written
* this amount, but the layer above doesnt need to know.
*/
return ocount;
}
void CloseSession(izip_session* session)
{
if (session->status == IZIP_OPEN)
{
session->status = IZIP_CLOSED;
session->outbuf.clear();
delete session->inbuf;
}
}
};
MODULE_INIT(ModuleZLib);
\ No newline at end of file +/* +------------------------------------+ + * | Inspire Internet Relay Chat Daemon | + * +------------------------------------+ + * + * InspIRCd: (C) 2002-2007 InspIRCd Development Team + * See: http://www.inspircd.org/wiki/index.php/Credits + * + * This program is free but copyrighted software; see + * the file COPYING for details. + * + * --------------------------------------------------- + */ + +#include "inspircd.h" +#include <zlib.h> +#include "users.h" +#include "channels.h" +#include "modules.h" +#include "socket.h" +#include "hashcomp.h" +#include "transport.h" + +/* $ModDesc: Provides zlib link support for servers */ +/* $LinkerFlags: -lz */ +/* $ModDep: transport.h */ + +/* + * Compressed data is transmitted across the link in the following format: + * + * 0 1 2 3 4 ... n + * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ + * | n | Z0 -> Zn | + * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+ + * + * Where: n is the size of a frame, in network byte order, 4 bytes. + * Z0 through Zn are Zlib compressed data, n bytes in length. + * + * If the module fails to read the entire frame, then it will buffer + * the portion of the last frame it received, then attempt to read + * the next part of the frame next time a write notification arrives. + * + * ZLIB_BEST_COMPRESSION (9) is used for all sending of data with + * a flush after each frame. A frame may contain multiple lines + * and should be treated as raw binary data. + * + */ + +/* Status of a connection */ +enum izip_status { IZIP_OPEN, IZIP_CLOSED }; + +/* Maximum transfer size per read operation */ +const unsigned int CHUNK = 128 * 1024; + +/* This class manages a compressed chunk of data preceeded by + * a length count. + * + * It can handle having multiple chunks of data in the buffer + * at any time. + */ +class CountedBuffer : public classbase +{ + std::string buffer; /* Current buffer contents */ + unsigned int amount_expected; /* Amount of data expected */ + public: + CountedBuffer() + { + amount_expected = 0; + } + + /** Adds arbitrary compressed data to the buffer. + * - Binsry safe, of course. + */ + void AddData(unsigned char* data, int data_length) + { + buffer.append((const char*)data, data_length); + this->NextFrameSize(); + } + + /** Works out the size of the next compressed frame + */ + void NextFrameSize() + { + if ((!amount_expected) && (buffer.length() >= 4)) + { + /* We have enough to read an int - + * Yes, this is safe, but its ugly. Give me + * a nicer way to read 4 bytes from a binary + * stream, and push them into a 32 bit int, + * and i'll consider replacing this. + */ + amount_expected = ntohl((buffer[3] << 24) | (buffer[2] << 16) | (buffer[1] << 8) | buffer[0]); + buffer = buffer.substr(4); + } + } + + /** Gets the next frame and returns its size, or returns + * zero if there isnt one available yet. + * A frame can contain multiple plaintext lines. + * - Binary safe. + */ + int GetFrame(unsigned char* frame, int maxsize) + { + if (amount_expected) + { + /* We know how much we're expecting... + * Do we have enough yet? + */ + if (buffer.length() >= amount_expected) + { + int j = 0; + for (unsigned int i = 0; i < amount_expected; i++, j++) + frame[i] = buffer[i]; + + buffer = buffer.substr(j); + amount_expected = 0; + NextFrameSize(); + return j; + } + } + /* Not enough for a frame yet, COME AGAIN! */ + return 0; + } +}; + +/** Represents an zipped connections extra data + */ +class izip_session : public classbase +{ + public: + z_stream c_stream; /* compression stream */ + z_stream d_stream; /* decompress stream */ + izip_status status; /* Connection status */ + int fd; /* File descriptor */ + CountedBuffer* inbuf; /* Holds input buffer */ + std::string outbuf; /* Holds output buffer */ +}; + +class ModuleZLib : public Module +{ + izip_session sessions[MAX_DESCRIPTORS]; + + /* Used for stats z extensions */ + float total_out_compressed; + float total_in_compressed; + float total_out_uncompressed; + float total_in_uncompressed; + + public: + + ModuleZLib(InspIRCd* Me) + : Module::Module(Me) + { + ServerInstance->PublishInterface("InspSocketHook", this); + + total_out_compressed = total_in_compressed = 0; + total_out_uncompressed = total_out_uncompressed = 0; + } + + virtual ~ModuleZLib() + { + ServerInstance->UnpublishInterface("InspSocketHook", this); + } + + virtual Version GetVersion() + { + return Version(1, 1, 0, 0, VF_VENDOR, API_VERSION); + } + + void Implements(char* List) + { + List[I_OnRawSocketConnect] = List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = 1; + List[I_OnStats] = List[I_OnRequest] = 1; + } + + /* Handle InspSocketHook API requests */ + virtual char* OnRequest(Request* request) + { + ISHRequest* ISR = (ISHRequest*)request; + if (strcmp("IS_NAME", request->GetId()) == 0) + { + /* Return name */ + return "zip"; + } + else if (strcmp("IS_HOOK", request->GetId()) == 0) + { + /* Attach to an inspsocket */ + char* ret = "OK"; + try + { + ret = ServerInstance->Config->AddIOHook((Module*)this, (InspSocket*)ISR->Sock) ? (char*)"OK" : NULL; + } + catch (ModuleException& e) + { + return NULL; + } + return ret; + } + else if (strcmp("IS_UNHOOK", request->GetId()) == 0) + { + /* Detatch from an inspsocket */ + return ServerInstance->Config->DelIOHook((InspSocket*)ISR->Sock) ? (char*)"OK" : NULL; + } + else if (strcmp("IS_HSDONE", request->GetId()) == 0) + { + /* Check for completion of handshake + * (actually, this module doesnt handshake) + */ + return "OK"; + } + else if (strcmp("IS_ATTACH", request->GetId()) == 0) + { + /* Attach certificate data to the inspsocket + * (this module doesnt do that, either) + */ + return NULL; + } + return NULL; + } + + /* Handle stats z (misc stats) */ + virtual int OnStats(char symbol, userrec* user, string_list &results) + { + if (symbol == 'z') + { + std::string sn = ServerInstance->Config->ServerName; + + /* Yeah yeah, i know, floats are ew. + * We used them here because we'd be casting to float anyway to do this maths, + * and also only floating point numbers can deal with the pretty large numbers + * involved in the total throughput of a server over a large period of time. + * (we dont count 64 bit ints because not all systems have 64 bit ints, and floats + * can still hold more. + */ + float outbound_r = 100 - ((total_out_compressed / (total_out_uncompressed + 0.001)) * 100); + float inbound_r = 100 - ((total_in_compressed / (total_in_uncompressed + 0.001)) * 100); + + float total_compressed = total_in_compressed + total_out_compressed; + float total_uncompressed = total_in_uncompressed + total_out_uncompressed; + + float total_r = 100 - ((total_compressed / (total_uncompressed + 0.001)) * 100); + + char outbound_ratio[MAXBUF], inbound_ratio[MAXBUF], combined_ratio[MAXBUF]; + + sprintf(outbound_ratio, "%3.2f%%", outbound_r); + sprintf(inbound_ratio, "%3.2f%%", inbound_r); + sprintf(combined_ratio, "%3.2f%%", total_r); + + results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS outbound_compressed = "+ConvToStr(total_out_compressed)); + results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS inbound_compressed = "+ConvToStr(total_in_compressed)); + results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS outbound_uncompressed = "+ConvToStr(total_out_uncompressed)); + results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS inbound_uncompressed = "+ConvToStr(total_in_uncompressed)); + results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS outbound_ratio = "+outbound_ratio); + results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS inbound_ratio = "+inbound_ratio); + results.push_back(sn+" 304 "+user->nick+" :ZIPSTATS combined_ratio = "+combined_ratio); + return 0; + } + + return 0; + } + + virtual void OnRawSocketAccept(int fd, const std::string &ip, int localport) + { + izip_session* session = &sessions[fd]; + + /* allocate state and buffers */ + session->fd = fd; + session->status = IZIP_OPEN; + session->inbuf = new CountedBuffer(); + + session->c_stream.zalloc = (alloc_func)0; + session->c_stream.zfree = (free_func)0; + session->c_stream.opaque = (voidpf)0; + + session->d_stream.zalloc = (alloc_func)0; + session->d_stream.zfree = (free_func)0; + session->d_stream.opaque = (voidpf)0; + } + + virtual void OnRawSocketConnect(int fd) + { + /* Nothing special needs doing here compared to accept() */ + OnRawSocketAccept(fd, "", 0); + } + + virtual void OnRawSocketClose(int fd) + { + CloseSession(&sessions[fd]); + } + + virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult) + { + /* Find the sockets session */ + izip_session* session = &sessions[fd]; + + if (session->status == IZIP_CLOSED) + return 0; + + unsigned char compr[CHUNK + 4]; + unsigned int offset = 0; + unsigned int total_size = 0; + + /* Read CHUNK bytes at a time to the buffer (usually 128k) */ + readresult = read(fd, compr, CHUNK); + + /* Did we get anything? */ + if (readresult > 0) + { + /* Add it to the frame queue */ + session->inbuf->AddData(compr, readresult); + total_in_compressed += readresult; + + /* Parse all completed frames */ + int size = 0; + while ((size = session->inbuf->GetFrame(compr, CHUNK)) != 0) + { + session->d_stream.next_in = (Bytef*)compr; + session->d_stream.avail_in = 0; + session->d_stream.next_out = (Bytef*)(buffer + offset); + + /* If we cant call this, well, we're boned. */ + if (inflateInit(&session->d_stream) != Z_OK) + return 0; + + while ((session->d_stream.total_out < count) && (session->d_stream.total_in < (unsigned int)size)) + { + session->d_stream.avail_in = session->d_stream.avail_out = 1; + if (inflate(&session->d_stream, Z_NO_FLUSH) == Z_STREAM_END) + break; + } + + /* Stick a fork in me, i'm done */ + inflateEnd(&session->d_stream); + + /* Update counters and offsets */ + total_size += session->d_stream.total_out; + total_in_uncompressed += session->d_stream.total_out; + offset += session->d_stream.total_out; + } + + /* Null-terminate the buffer -- this doesnt harm binary data */ + buffer[total_size] = 0; + + /* Set the read size to the correct total size */ + readresult = total_size; + + } + return (readresult > 0); + } + + virtual int OnRawSocketWrite(int fd, const char* buffer, int count) + { + izip_session* session = &sessions[fd]; + int ocount = count; + + if (!count) /* Nothing to do! */ + return 0; + + if(session->status != IZIP_OPEN) + { + /* Seriously, wtf? */ + CloseSession(session); + return 0; + } + + unsigned char compr[CHUNK + 4]; + + /* Gentlemen, start your engines! */ + if (deflateInit(&session->c_stream, Z_BEST_COMPRESSION) != Z_OK) + { + CloseSession(session); + return 0; + } + + /* Set buffer sizes (we reserve 4 bytes at the start of the + * buffer for the length counters) + */ + session->c_stream.next_in = (Bytef*)buffer; + session->c_stream.next_out = compr + 4; + + /* Compress the text */ + while ((session->c_stream.total_in < (unsigned int)count) && (session->c_stream.total_out < CHUNK)) + { + session->c_stream.avail_in = session->c_stream.avail_out = 1; + if (deflate(&session->c_stream, Z_NO_FLUSH) != Z_OK) + { + CloseSession(session); + return 0; + } + } + /* Finish the stream */ + for (session->c_stream.avail_out = 1; deflate(&session->c_stream, Z_FINISH) != Z_STREAM_END; session->c_stream.avail_out = 1); + deflateEnd(&session->c_stream); + + total_out_uncompressed += ocount; + total_out_compressed += session->c_stream.total_out; + + /** Assemble the frame length onto the frame, in network byte order */ + compr[0] = (session->c_stream.total_out >> 24); + compr[1] = (session->c_stream.total_out >> 16); + compr[2] = (session->c_stream.total_out >> 8); + compr[3] = (session->c_stream.total_out & 0xFF); + + /* Add compressed data plus leading length to the output buffer - + * Note, we may have incomplete half-sent frames in here. + */ + session->outbuf.append((const char*)compr, session->c_stream.total_out + 4); + + /* Lets see how much we can send out */ + int ret = write(fd, session->outbuf.data(), session->outbuf.length()); + + /* Check for errors, and advance the buffer if any was sent */ + if (ret > 0) + session->outbuf = session->outbuf.substr(ret); + else if (ret < 1) + { + if (ret == -1) + { + if (errno == EAGAIN) + return 0; + else + { + session->outbuf.clear(); + return 0; + } + } + else + { + session->outbuf.clear(); + return 0; + } + } + + /* ALL LIES the lot of it, we havent really written + * this amount, but the layer above doesnt need to know. + */ + return ocount; + } + + void CloseSession(izip_session* session) + { + if (session->status == IZIP_OPEN) + { + session->status = IZIP_CLOSED; + session->outbuf.clear(); + delete session->inbuf; + } + } + +}; + +MODULE_INIT(ModuleZLib); + |