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/*
* Printing interface for PuTTY.
*/
#include "putty.h"
#include <winspool.h>
struct printer_enum_tag {
int nprinters;
DWORD enum_level;
union {
LPPRINTER_INFO_4 i4;
LPPRINTER_INFO_5 i5;
} info;
};
struct printer_job_tag {
HANDLE hprinter;
};
DECL_WINDOWS_FUNCTION(static, BOOL, EnumPrinters,
(DWORD, LPTSTR, DWORD, LPBYTE, DWORD, LPDWORD, LPDWORD));
DECL_WINDOWS_FUNCTION(static, BOOL, OpenPrinter,
(LPTSTR, LPHANDLE, LPPRINTER_DEFAULTS));
DECL_WINDOWS_FUNCTION(static, BOOL, ClosePrinter, (HANDLE));
DECL_WINDOWS_FUNCTION(static, DWORD, StartDocPrinter, (HANDLE, DWORD, LPBYTE));
DECL_WINDOWS_FUNCTION(static, BOOL, EndDocPrinter, (HANDLE));
DECL_WINDOWS_FUNCTION(static, BOOL, StartPagePrinter, (HANDLE));
DECL_WINDOWS_FUNCTION(static, BOOL, EndPagePrinter, (HANDLE));
DECL_WINDOWS_FUNCTION(static, BOOL, WritePrinter,
(HANDLE, LPVOID, DWORD, LPDWORD));
static void init_winfuncs(void)
{
static bool initialised = false;
if (initialised)
return;
{
HMODULE winspool_module = load_system32_dll("winspool.drv");
/* Some MSDN documentation claims that some of the below functions
* should be loaded from spoolss.dll, but this doesn't seem to
* be reliable in practice.
* Nevertheless, we load spoolss.dll ourselves using our safe
* loading method, against the possibility that winspool.drv
* later loads it unsafely. */
(void) load_system32_dll("spoolss.dll");
GET_WINDOWS_FUNCTION_PP(winspool_module, EnumPrinters);
GET_WINDOWS_FUNCTION_PP(winspool_module, OpenPrinter);
GET_WINDOWS_FUNCTION_PP(winspool_module, ClosePrinter);
GET_WINDOWS_FUNCTION_PP(winspool_module, StartDocPrinter);
GET_WINDOWS_FUNCTION_PP(winspool_module, EndDocPrinter);
GET_WINDOWS_FUNCTION_PP(winspool_module, StartPagePrinter);
GET_WINDOWS_FUNCTION_PP(winspool_module, EndPagePrinter);
GET_WINDOWS_FUNCTION_PP(winspool_module, WritePrinter);
}
initialised = true;
}
static bool printer_add_enum(int param, DWORD level, char **buffer,
int offset, int *nprinters_ptr)
{
DWORD needed = 0, nprinters = 0;
init_winfuncs();
*buffer = sresize(*buffer, offset+512, char);
/*
* Exploratory call to EnumPrinters to determine how much space
* we'll need for the output.
*
* If we get ERROR_INSUFFICIENT_BUFFER, that's fine, we're
* prepared to deal with it. Any other error, we return failure.
*/
if (p_EnumPrinters(param, NULL, level, (LPBYTE)((*buffer)+offset), 512,
&needed, &nprinters) == 0 &&
GetLastError() != ERROR_INSUFFICIENT_BUFFER)
return false;
if (needed < 512)
needed = 512;
*buffer = sresize(*buffer, offset+needed, char);
if (p_EnumPrinters(param, NULL, level, (LPBYTE)((*buffer)+offset),
needed, &needed, &nprinters) == 0)
return false;
*nprinters_ptr += nprinters;
return true;
}
printer_enum *printer_start_enum(int *nprinters_ptr)
{
printer_enum *pe = snew(printer_enum);
char *buffer = NULL;
*nprinters_ptr = 0; /* default return value */
buffer = snewn(512, char);
/*
* Determine what enumeration level to use.
* When enumerating printers, we need to use PRINTER_INFO_4 on
* NT-class systems to avoid Windows looking too hard for them and
* slowing things down; and we need to avoid PRINTER_INFO_5 as
* we've seen network printers not show up.
* On 9x-class systems, PRINTER_INFO_4 isn't available and
* PRINTER_INFO_5 is recommended.
* Bletch.
*/
if (osPlatformId != VER_PLATFORM_WIN32_NT) {
pe->enum_level = 5;
} else {
pe->enum_level = 4;
}
if (!printer_add_enum(PRINTER_ENUM_LOCAL | PRINTER_ENUM_CONNECTIONS,
pe->enum_level, &buffer, 0, nprinters_ptr))
goto error;
switch (pe->enum_level) {
case 4:
pe->info.i4 = (LPPRINTER_INFO_4)buffer;
break;
case 5:
pe->info.i5 = (LPPRINTER_INFO_5)buffer;
break;
}
pe->nprinters = *nprinters_ptr;
return pe;
error:
sfree(buffer);
sfree(pe);
*nprinters_ptr = 0;
return NULL;
}
char *printer_get_name(printer_enum *pe, int i)
{
if (!pe)
return NULL;
if (i < 0 || i >= pe->nprinters)
return NULL;
switch (pe->enum_level) {
case 4:
return pe->info.i4[i].pPrinterName;
case 5:
return pe->info.i5[i].pPrinterName;
default:
return NULL;
}
}
void printer_finish_enum(printer_enum *pe)
{
if (!pe)
return;
switch (pe->enum_level) {
case 4:
sfree(pe->info.i4);
break;
case 5:
sfree(pe->info.i5);
break;
}
sfree(pe);
}
printer_job *printer_start_job(char *printer)
{
printer_job *pj = snew(printer_job);
DOC_INFO_1 docinfo;
bool jobstarted = false, pagestarted = false;
init_winfuncs();
pj->hprinter = NULL;
if (!p_OpenPrinter(printer, &pj->hprinter, NULL))
goto error;
docinfo.pDocName = "PuTTY remote printer output";
docinfo.pOutputFile = NULL;
docinfo.pDatatype = "RAW";
if (!p_StartDocPrinter(pj->hprinter, 1, (LPBYTE)&docinfo))
goto error;
jobstarted = true;
if (!p_StartPagePrinter(pj->hprinter))
goto error;
pagestarted = true;
return pj;
error:
if (pagestarted)
p_EndPagePrinter(pj->hprinter);
if (jobstarted)
p_EndDocPrinter(pj->hprinter);
if (pj->hprinter)
p_ClosePrinter(pj->hprinter);
sfree(pj);
return NULL;
}
void printer_job_data(printer_job *pj, const void *data, size_t len)
{
DWORD written;
if (!pj)
return;
p_WritePrinter(pj->hprinter, (void *)data, len, &written);
}
void printer_finish_job(printer_job *pj)
{
if (!pj)
return;
p_EndPagePrinter(pj->hprinter);
p_EndDocPrinter(pj->hprinter);
p_ClosePrinter(pj->hprinter);
sfree(pj);
}
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