/*
* fstream_read
*
* Read 'size' bytes of data from the filestream into 'buffer'.
* If 'read_whole_lines' is specified then read up to the last logical row
* in the source buffer. 'fo' keeps the state (name, offset, etc) of the current
* filestream file we are reading from.
*/
int fstream_read(fstream_t *fs,
void *dest,
int size,
struct fstream_filename_and_offset *fo,
const int read_whole_lines,
const char *line_delim_str,
const int line_delim_length)
{
int buffer_capacity = fs->options.bufsize;
static char err_buf[FILE_ERROR_SZ] = {0};
if (fs->ferror)
return -1;
for (;;)
{
ssize_t bytesread; /* num bytes read from filestream */
ssize_t bytesread2; /* same, but when reading a second round */
if (!size || fs->fidx == fs->glob.gl_pathc)
return 0;
/*
* If data source has a header, we consume it now and in order to
* move on to real data that follows it.
*/
if (fs->skip_header_line)
{
char* p = fs->buffer;
char* q = p + fs->buffer_cur_size;
size_t len = 0;
assert(fs->buffer_cur_size < buffer_capacity);
/*
* read data from the source file and fill up the file stream buffer
*/
len = buffer_capacity - fs->buffer_cur_size;
bytesread = gfile_read(&fs->fd, q, len);
if (bytesread < 0)
{
fs->ferror = format_error("cannot read file - ", fs->glob.gl_pathv[fs->fidx]);
return -1;
}
/* update the buffer size according to new byte count we just read */
fs->buffer_cur_size += bytesread;
q += bytesread;
if (fs->options.is_csv)
{
/* csv header */
p = scan_csv_records(p, q, 1, fs);
}
else
{
if (line_delim_length > 0)
{
/* text header with defined EOL */
p = find_first_eol_delim (p, q, line_delim_str, line_delim_length);
}
else
{
/* text header with \n as delimiter (by default) */
for (; p < q && *p != '\n'; p++)
;
}
p = (p < q) ? p + 1 : 0;
fs->line_number++;
}
if (!p)
{
if (fs->buffer_cur_size == buffer_capacity)
{
gfile_printf_then_putc_newline(
"fstream ERROR: header too long in file %s",
fs->glob.gl_pathv[fs->fidx]);
fs->ferror = "line too long in file";
return -1;
}
p = q;
}
/*
* update the filestream buffer offset to past last line read and
* copy the end of the buffer (past header data) to the beginning.
* we now bypassed the header data and can continue to real data.
*/
fs->foff += p - fs->buffer;
fs->buffer_cur_size = q - p;
memmove(fs->buffer, p, fs->buffer_cur_size);
fs->skip_header_line = 0;
}
/*
* If we need to read all the data up to the last *complete* logical
* line in the data buffer (like gpfdist for example) - we choose this
* path. We grab the bigger chunk we can get that includes whole lines.
* Otherwise, if we just want the whole buffer we skip.
*/
if (read_whole_lines)
{
char *p;
ssize_t total_bytes = fs->buffer_cur_size;
assert(size >= buffer_capacity);
if (total_bytes > 0)
{
/*
* source buffer is not empty. copy the data from the beginning
* up to the current length before moving on to reading more
*/
fs->buffer_cur_size = 0;
updateCurFileState(fs, fo);
memcpy(dest, fs->buffer, total_bytes);
}
/* read more data from source file into destination buffer */
bytesread2 = gfile_read(&fs->fd, (char*) dest + total_bytes, size - total_bytes);
if (bytesread2 < 0)
{
fs->ferror = format_error("cannot read file - ", fs->glob.gl_pathv[fs->fidx]);
return -1;
}
if (bytesread2 < size - total_bytes)
{
/*
* We didn't read as much as we asked for. Check why.
* We could be done reading data, we may need to move
* on the reading the next data file (if any).
*/
if (total_bytes == 0)
{
if (bytesread2 == 0)
{
if (nextFile(fs))
return -1; /* found next file but failed to open */
continue;
}
updateCurFileState(fs, fo);
}
/*
* try to open the next file if any, and return the number of
* bytes read to buffer earlier, if next file was found but
* could not open return -1
*/
return nextFile(fs) ? -1 : total_bytes + bytesread2;
}
updateCurFileState(fs, fo);
/*
* Now that we have enough data in our filestream buffer, get a
* chunk of whole rows and copy it into our dest buffer to be sent
* out later.
*/
if (fs->options.is_csv)
{
/* CSV: go slow, scan byte-by-byte for record boundary */
p = scan_csv_records(dest, (char*)dest + size, 0, fs);
}
else
{
/*
* TEXT: go fast, scan for end of line delimiter (\n by default) for
* record boundary.
* find the last end of line delimiter from the back
*/
if (line_delim_length > 0)
{
p = find_last_eol_delim((char*)dest, size, line_delim_str, line_delim_length);
}
else
{
for (p = (char*)dest + size; (char*)dest <= --p && *p != '\n';)
;
}
p = (char*)dest <= p ? p + 1 : 0;
fs->line_number = 0;
}
/*
* could we not find even one complete row in this buffer? error.
*/
if (!p || (char*)dest + size >= p + buffer_capacity)
{
snprintf(err_buf, sizeof(err_buf), "line too long in file %s near (%lld bytes)",
fs->glob.gl_pathv[fs->fidx], (long long) fs->foff);
fs->ferror = err_buf;
gfile_printf_then_putc_newline("%s", err_buf);
return -1;
}
/* copy the result chunk of data into our buffer and we're done */
fs->buffer_cur_size = (char*)dest + size - p;
memcpy(fs->buffer, p, fs->buffer_cur_size);
fs->foff += p - (char*)dest;
return p - (char*)dest;
}
/*
* if we're here it means that we just want chunks of data and don't
* care if it includes whole rows or not (for example, backend url_read
* code - a segdb that reads all the data that gpfdist sent to it,
* buffer by buffer and then parses the lines internally).
*/
if (fs->buffer_cur_size)
{
ssize_t total_bytes = fs->buffer_cur_size;
updateCurFileState(fs, fo);
if (total_bytes > size)
total_bytes = size;
memcpy(dest, fs->buffer, total_bytes);
fs->buffer_cur_size -= total_bytes;
memmove(fs->buffer, fs->buffer + total_bytes, fs->buffer_cur_size);
fs->foff += total_bytes;
fs->line_number = 0;
return total_bytes;
}
bytesread = gfile_read(&fs->fd, dest, size);
if (bytesread < 0)
{
fs->ferror = format_error("cannot read file - ", fs->glob.gl_pathv[fs->fidx]);
return -1;
}
if (bytesread)
{
updateCurFileState(fs, fo);
fs->foff += bytesread;
fs->line_number = 0;
return bytesread;
}
if (nextFile(fs))
return -1;
}
}
// Background part as separate thread
// Don't do any GUI things on this thread.
void print_gdi_thread(void *pdummy)
{
PGDI_THREAD *pth= (PGDI_THREAD *)pdummy;
CPrintDIB printdib;
char buf[MAXSTR];
int length;
LPBYTE pLine;
LPBYTE p;
DWORD dwRead;
int i;
GFile *pFile = gfile_open_handle((int)pth->hPipeRd);
int page = 0;
BOOL print_it;
printdib.debug = (debug & DEBUG_GDI);
while (printdib.ReadHeader(pFile)) {
page++;
print_it = TRUE;
if ((pth->oddeven == EVEN_PAGES) && ((page & 1) == 1))
print_it = FALSE;
else if ((pth->oddeven == ODD_PAGES) && ((page & 1) == 0))
print_it = FALSE;
if ((pth->from > 0) && (page < pth->from))
print_it = FALSE;
if ((pth->to > 0) && (page > pth->to))
print_it = FALSE;
sprintf(buf, "Page %d, %s\n", page, print_it ? "PRINT" : "ignore");
gs_addmess(buf);
if (print_it)
StartPage(pth->hdc);
length = printdib.m_bytewidth;
pLine = new BYTE[length];
for (i=0; i < printdib.m_PageBmp.bmp2.biHeight; i++) {
// read a scan line
length = printdib.m_bytewidth;
p = pLine;
while (length && (dwRead = gfile_read(pFile, p, length)) != 0) {
length -= dwRead;
p += dwRead;
}
if (print_it)
printdib.AddPrintLine(pth->hdc, i, pLine);
}
if (print_it) {
printdib.FlushPrintBitmap(pth->hdc);
EndPage(pth->hdc);
}
delete pLine;
}
EndDoc(pth->hdc);
DeleteDC(pth->hdc);
pth->hdc = NULL;
gfile_close(pFile);
free(pth);
print_count--;
/* if printing from command line, close GSview */
if (print_exit && (print_count==0) && !(debug & DEBUG_GDI))
gsview_command(IDM_EXIT);
gs_addmess("\nPrint GDI finished\n");
}
