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Fix \r\n handling in stream read and write functions

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This commit is contained in:
Grégory Soutadé 2023-01-07 15:43:39 +01:00
parent 68371b9b17
commit fee7ec9cc3
3 changed files with 29 additions and 16 deletions
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2
include/uPDFParser.h
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@ -104,6 +104,7 @@ namespace uPDFParser
bool parseXref();
bool parseTrailer();
char prevChar();
std::string nextToken(bool exceptionOnEOF=true, bool readComment=false);
DataType* parseType(std::string& token, Object* object, std::map<std::string, DataType*>& dict);
@ -121,6 +122,7 @@ namespace uPDFParser
void writeBuffer(int fd, const char* buffer, int size);
void writeUpdate(const std::string& filename);
char c;
int version_major, version_minor;
std::vector<Object*> _objects;
Object trailer, *xrefObject;

28
src/uPDFParser.cpp
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@ -157,12 +157,14 @@ namespace uPDFParser
}
}
char Parser::prevChar() { return c; }
/**
* @brief Find next token to analyze
*/
std::string Parser::nextToken(bool exceptionOnEOF, bool readComment)
{
char c = 0, prev_c;
char prev_c;
std::string res("");
int i;
static const char delims[] = " \t<>[]()/";
@ -170,6 +172,7 @@ namespace uPDFParser
static const char start_delims[] = "<>[]()";
bool found = false;
c = 0;
while (!found)
{
prev_c = c;
@ -574,9 +577,19 @@ namespace uPDFParser
{
off_t startOffset, endOffset, endStream;
std::string token;
char c = 0;
// std::cout << "parseStream" << std::endl;
// Remove \n after \r if there is one
if (prevChar() == '\r' && read(fd, &c, 1) == 1)
{
if (c != '\n')
{
lseek(fd, -1, SEEK_CUR);
}
}
startOffset = lseek(fd, 0, SEEK_CUR);
if (!object->hasKey("Length"))
@ -622,9 +635,16 @@ namespace uPDFParser
ret = read(fd, &c, 1);
if (ret <= 0)
break;
if (c != '\n' && c != '\r')
break;
lseek(fd, -1, SEEK_CUR);
if (c == '\r')
{
lseek(fd, -1, SEEK_CUR);
continue;
}
else if (c == '\n')
{
lseek(fd, -1, SEEK_CUR);
}
break;
}
// Adjust final position
lseek(fd, endStream, SEEK_SET);

13
src/uPDFTypes.cpp
View File

@ -105,19 +105,10 @@ namespace uPDFParser
std::string Stream::str()
{
std::string res = "stream";
std::string res = "stream\n";
const char* streamData = (const char*)data(); // Force reading if not in memory
if (_dataLength &&
streamData[0] != '\n' &&
streamData[0] != '\r')
res += "\n";
res += std::string(streamData, _dataLength);
// Be sure there is a final line return
if (_dataLength &&
streamData[_dataLength-1] != '\n' &&
streamData[_dataLength-1] != '\r')
res += "\n";
res += "endstream\n";
res += "\nendstream\n";
return res;
}