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//========================================================================
//
// FoFiBase.cc
//
// Copyright 1999-2003 Glyph & Cog, LLC
//
//========================================================================
//========================================================================
//
// Modified under the Poppler project - http://poppler.freedesktop.org
//
// All changes made under the Poppler project to this file are licensed
// under GPL version 2 or later
//
// Copyright (C) 2008 Ed Avis <eda@waniasset.com>
// Copyright (C) 2011 Jim Meyering <jim@meyering.net>
// Copyright (C) 2016, 2018, 2020 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2019 Christian Persch <chpe@src.gnome.org>
// Copyright (C) 2019 LE GARREC Vincent <legarrec.vincent@gmail.com>
// Copyright (C) 2022 Oliver Sander <oliver.sander@tu-dresden.de>
//
// To see a description of the changes please see the Changelog file that
// came with your tarball or type make ChangeLog if you are building from git
//
//========================================================================
#include <config.h>
#include <cstdio>
#include <climits>
#include "goo/gfile.h"
#include "goo/gmem.h"
#include "poppler/Error.h"
#include "FoFiBase.h"
//------------------------------------------------------------------------
// FoFiBase
//------------------------------------------------------------------------
FoFiBase::FoFiBase(const unsigned char *fileA, int lenA, bool freeFileDataA)
{
file = fileA;
len = lenA;
freeFileData = freeFileDataA;
}
FoFiBase::~FoFiBase()
{
if (freeFileData) {
gfree((char *)file);
}
}
char *FoFiBase::readFile(const char *fileName, int *fileLen)
{
FILE *f;
char *buf;
int n;
if (!(f = openFile(fileName, "rb"))) {
error(errIO, -1, "Cannot open '{0:s}'", fileName);
return nullptr;
}
if (fseek(f, 0, SEEK_END) != 0) {
error(errIO, -1, "Cannot seek to end of '{0:s}'", fileName);
fclose(f);
return nullptr;
}
n = (int)ftell(f);
if (n < 0) {
error(errIO, -1, "Cannot determine length of '{0:s}'", fileName);
fclose(f);
return nullptr;
}
if (fseek(f, 0, SEEK_SET) != 0) {
error(errIO, -1, "Cannot seek to start of '{0:s}'", fileName);
fclose(f);
return nullptr;
}
buf = (char *)gmalloc(n);
if ((int)fread(buf, 1, n, f) != n) {
gfree(buf);
fclose(f);
return nullptr;
}
fclose(f);
*fileLen = n;
return buf;
}
int FoFiBase::getS8(int pos, bool *ok) const
{
int x;
if (pos < 0 || pos >= len) {
*ok = false;
return 0;
}
x = file[pos];
if (x & 0x80) {
x |= ~0xff;
}
return x;
}
int FoFiBase::getU8(int pos, bool *ok) const
{
if (pos < 0 || pos >= len) {
*ok = false;
return 0;
}
return file[pos];
}
int FoFiBase::getS16BE(int pos, bool *ok) const
{
int x;
if (pos < 0 || pos > INT_MAX - 1 || pos + 1 >= len) {
*ok = false;
return 0;
}
x = file[pos];
x = (x << 8) + file[pos + 1];
if (x & 0x8000) {
x |= ~0xffff;
}
return x;
}
int FoFiBase::getU16BE(int pos, bool *ok) const
{
int x;
if (pos < 0 || pos > INT_MAX - 1 || pos + 1 >= len) {
*ok = false;
return 0;
}
x = file[pos];
x = (x << 8) + file[pos + 1];
return x;
}
int FoFiBase::getS32BE(int pos, bool *ok) const
{
int x;
if (pos < 0 || pos > INT_MAX - 3 || pos + 3 >= len) {
*ok = false;
return 0;
}
x = file[pos];
x = (x << 8) + file[pos + 1];
x = (x << 8) + file[pos + 2];
x = (x << 8) + file[pos + 3];
if (x & 0x80000000) {
x |= ~0xffffffff;
}
return x;
}
unsigned int FoFiBase::getU32BE(int pos, bool *ok) const
{
unsigned int x;
if (pos < 0 || pos > INT_MAX - 3 || pos + 3 >= len) {
*ok = false;
return 0;
}
x = file[pos];
x = (x << 8) + file[pos + 1];
x = (x << 8) + file[pos + 2];
x = (x << 8) + file[pos + 3];
return x;
}
unsigned int FoFiBase::getU32LE(int pos, bool *ok) const
{
unsigned int x;
if (pos < 0 || pos > INT_MAX - 3 || pos + 3 >= len) {
*ok = false;
return 0;
}
x = file[pos + 3];
x = (x << 8) + file[pos + 2];
x = (x << 8) + file[pos + 1];
x = (x << 8) + file[pos];
return x;
}
unsigned int FoFiBase::getUVarBE(int pos, int size, bool *ok) const
{
unsigned int x;
int i;
if (pos < 0 || pos > INT_MAX - size || pos + size > len) {
*ok = false;
return 0;
}
x = 0;
for (i = 0; i < size; ++i) {
x = (x << 8) + file[pos + i];
}
return x;
}
bool FoFiBase::checkRegion(int pos, int size) const
{
return pos >= 0 && size >= 0 && pos < INT_MAX - size && size < INT_MAX - pos && pos + size >= pos && pos + size <= len;
}
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