static byte[] getBytes(final long start, final int count, final RandomAccessBuffer pdf_datafile) {
final byte[] buffer = new byte[count];
try {
pdf_datafile.seek(start);
pdf_datafile.read(buffer); // get next chars
} catch (final IOException e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
return buffer;
}
/** read table of values */
public int readXRefs(
int current,
final byte[] Bytes,
final int endTable,
int i,
final long eof,
final RandomAccessBuffer pdf_datafile) {
char flag;
int id, tokenCount, generation, lineLen, startLine, endLine;
boolean skipNext = false;
boolean isFirstValue = true;
final int[] breaks = new int[5];
final int[] starts = new int[5];
// loop to read all references
while (i < endTable) { // exit end at trailer
startLine = i;
endLine = -1;
/** read line locations */
// move to start of value ignoring spaces or returns
while (Bytes[i] != 10 && Bytes[i] != 13) {
// scan for %
if ((endLine == -1) && (Bytes[i] == 37)) {
endLine = i - 1;
}
i++;
}
// set end if no comment
if (endLine == -1) {
endLine = i - 1;
}
// strip any spaces
while (Bytes[startLine] == 32) {
startLine++;
}
// strip any spaces
while (Bytes[endLine] == 32) {
endLine--;
}
i++;
/** decode the line */
tokenCount = 0;
lineLen = endLine - startLine + 1;
if (lineLen > 0) {
// decide if line is a section header or value
// first count tokens
int lastChar = 1, currentChar;
for (int j = 1; j < lineLen; j++) {
currentChar = Bytes[startLine + j];
if ((currentChar == 32) && (lastChar != 32)) {
breaks[tokenCount] = j;
tokenCount++;
} else if ((currentChar != 32) && (lastChar == 32)) {
starts[tokenCount] = j;
}
lastChar = currentChar;
}
// update numbers so loops work
breaks[tokenCount] = lineLen;
tokenCount++;
if (tokenCount == 1) { // fix for first 2 values on separate lines
if (skipNext) {
skipNext = false;
} else {
current = NumberUtils.parseInt(startLine, startLine + breaks[0], Bytes);
skipNext = true;
}
} else if (tokenCount == 2) {
current = NumberUtils.parseInt(startLine, startLine + breaks[0], Bytes);
} else {
id = NumberUtils.parseInt(startLine, startLine + breaks[0], Bytes);
generation = NumberUtils.parseInt(startLine + starts[1], startLine + breaks[1], Bytes);
flag = (char) Bytes[startLine + starts[2]];
if ((flag == 'n')) { // only add objects in use
/** assume not valid and test to see if valid */
boolean isValid = false;
// get bytes
int bufSize = 20;
// adjust buffer if less than 1024 bytes left in file
if (id + bufSize > eof) {
bufSize = (int) (eof - id);
}
if (bufSize > 0) {
/** get bytes into buffer */
final byte[] buffer = getBytes(id, bufSize, pdf_datafile);
// look for space o b j
for (int ii = 4; ii < bufSize; ii++) {
if ((buffer[ii - 3] == 32 || buffer[ii - 3] == 10)
&& (buffer[ii - 2] == 111)
&& (buffer[ii - 1] == 98)
&& (buffer[ii] == 106)) {
isValid = true;
ii = bufSize;
}
}
// check number
if (isValid && isFirstValue) {
isFirstValue = false;
if (buffer[0] == 48 && buffer[1] != 48 && current == 1) {
current = 0;
} else if (buffer[0] == 49 && buffer[1] == 32) {
current = 1;
}
}
if (isValid) {
storeObjectOffset(current, id, generation, false, false);
xref.addElement(id);
} else if (LogWriter.isRunningFromIDE) {
LogWriter.writeLog(current + " " + id + " is bum reference");
}
}
current++; // update our pointer
} else if (flag == 'f') {
current++; // update our pointer
}
}
}
}
return current;
}
