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File xpdf-CVE-2007-5393.patch of Package pdftohtml
Index: xpdf/Stream.cc =================================================================== --- xpdf/Stream.cc.orig +++ xpdf/Stream.cc @@ -1218,6 +1218,7 @@ // CCITTFaxStream //------------------------------------------------------------------------ +#if 0 CCITTFaxStream::CCITTFaxStream(Stream *strA, int encodingA, GBool endOfLineA, GBool byteAlignA, int columnsA, int rowsA, GBool endOfBlockA, GBool blackA): @@ -1723,6 +1724,609 @@ } return (inputBuf >> (inputBits - n)) & (0xffff >> (16 - n)); } +#else // secfix CVE-2007-5393 +CCITTFaxStream::CCITTFaxStream(Stream *strA, int encodingA, GBool endOfLineA, + GBool byteAlignA, int columnsA, int rowsA, + GBool endOfBlockA, GBool blackA): + FilterStream(strA) { + encoding = encodingA; + endOfLine = endOfLineA; + byteAlign = byteAlignA; + columns = columnsA; + if (columns < 1) { + columns = 1; + } else if (columns > (INT_MAX - 2)/sizeof(int)) { + columns = (INT_MAX - 2)/sizeof(int); + } + rows = rowsA; + endOfBlock = endOfBlockA; + black = blackA; + // 0 <= codingLine[0] < codingLine[1] < ... < codingLine[n] = columns + // ---> max codingLine size = columns + 1 + // refLine has one extra guard entry at the end + // ---> max refLine size = columns + 2 + codingLine = (int *)gmalloc((columns + 1) * sizeof(int)); + refLine = (int *)gmalloc((columns + 2) * sizeof(int)); + + eof = gFalse; + row = 0; + nextLine2D = encoding < 0; + inputBits = 0; + codingLine[0] = columns; + a0i = 0; + outputBits = 0; + + buf = EOF; +} + +CCITTFaxStream::~CCITTFaxStream() { + delete str; + gfree(refLine); + gfree(codingLine); +} + +void CCITTFaxStream::reset() { + short code1; + + str->reset(); + eof = gFalse; + row = 0; + nextLine2D = encoding < 0; + inputBits = 0; + codingLine[0] = columns; + a0i = 0; + outputBits = 0; + buf = EOF; + + // skip any initial zero bits and end-of-line marker, and get the 2D + // encoding tag + while ((code1 = lookBits(12)) == 0) { + eatBits(1); + } + if (code1 == 0x001) { + eatBits(12); + } + if (encoding > 0) { + nextLine2D = !lookBits(1); + eatBits(1); + } +} + +inline void CCITTFaxStream::addPixels(int a1, int blackPixels) { + if (a1 > codingLine[a0i]) { + if (a1 > columns) { + error(getPos(), "CCITTFax row is wrong length (%d)", a1); + err = gTrue; + a1 = columns; + } + if ((a0i & 1) ^ blackPixels) { + ++a0i; + } + codingLine[a0i] = a1; + } +} + +inline void CCITTFaxStream::addPixelsNeg(int a1, int blackPixels) { + if (a1 > codingLine[a0i]) { + if (a1 > columns) { + error(getPos(), "CCITTFax row is wrong length (%d)", a1); + err = gTrue; + a1 = columns; + } + if ((a0i & 1) ^ blackPixels) { + ++a0i; + } + codingLine[a0i] = a1; + } else if (a1 < codingLine[a0i]) { + if (a1 < 0) { + error(getPos(), "Invalid CCITTFax code"); + err = gTrue; + a1 = 0; + } + while (a0i > 0 && a1 <= codingLine[a0i - 1]) { + --a0i; + } + codingLine[a0i] = a1; + } +} + +int CCITTFaxStream::lookChar() { + short code1, code2, code3; + int b1i, blackPixels, i, bits; + GBool gotEOL; + + if (buf != EOF) { + return buf; + } + + // read the next row + if (outputBits == 0) { + + // if at eof just return EOF + if (eof) { + return EOF; + } + + err = gFalse; + + // 2-D encoding + if (nextLine2D) { + for (i = 0; codingLine[i] < columns; ++i) { + refLine[i] = codingLine[i]; + } + refLine[i++] = columns; + refLine[i] = columns; + codingLine[0] = 0; + a0i = 0; + b1i = 0; + blackPixels = 0; + // invariant: + // refLine[b1i-1] <= codingLine[a0i] < refLine[b1i] < refLine[b1i+1] + // <= columns + // exception at left edge: + // codingLine[a0i = 0] = refLine[b1i = 0] = 0 is possible + // exception at right edge: + // refLine[b1i] = refLine[b1i+1] = columns is possible + while (codingLine[a0i] < columns) { + code1 = getTwoDimCode(); + switch (code1) { + case twoDimPass: + addPixels(refLine[b1i + 1], blackPixels); + if (refLine[b1i + 1] < columns) { + b1i += 2; + } + break; + case twoDimHoriz: + code1 = code2 = 0; + if (blackPixels) { + do { + code1 += code3 = getBlackCode(); + } while (code3 >= 64); + do { + code2 += code3 = getWhiteCode(); + } while (code3 >= 64); + } else { + do { + code1 += code3 = getWhiteCode(); + } while (code3 >= 64); + do { + code2 += code3 = getBlackCode(); + } while (code3 >= 64); + } + addPixels(codingLine[a0i] + code1, blackPixels); + if (codingLine[a0i] < columns) { + addPixels(codingLine[a0i] + code2, blackPixels ^ 1); + } + while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { + b1i += 2; + } + break; + case twoDimVertR3: + addPixels(refLine[b1i] + 3, blackPixels); + blackPixels ^= 1; + if (codingLine[a0i] < columns) { + ++b1i; + while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { + b1i += 2; + } + } + break; + case twoDimVertR2: + addPixels(refLine[b1i] + 2, blackPixels); + blackPixels ^= 1; + if (codingLine[a0i] < columns) { + ++b1i; + while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { + b1i += 2; + } + } + break; + case twoDimVertR1: + addPixels(refLine[b1i] + 1, blackPixels); + blackPixels ^= 1; + if (codingLine[a0i] < columns) { + ++b1i; + while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { + b1i += 2; + } + } + break; + case twoDimVert0: + addPixels(refLine[b1i], blackPixels); + blackPixels ^= 1; + if (codingLine[a0i] < columns) { + ++b1i; + while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { + b1i += 2; + } + } + break; + case twoDimVertL3: + addPixelsNeg(refLine[b1i] - 3, blackPixels); + blackPixels ^= 1; + if (codingLine[a0i] < columns) { + if (b1i > 0) { + --b1i; + } else { + ++b1i; + } + while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { + b1i += 2; + } + } + break; + case twoDimVertL2: + addPixelsNeg(refLine[b1i] - 2, blackPixels); + blackPixels ^= 1; + if (codingLine[a0i] < columns) { + if (b1i > 0) { + --b1i; + } else { + ++b1i; + } + while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { + b1i += 2; + } + } + break; + case twoDimVertL1: + addPixelsNeg(refLine[b1i] - 1, blackPixels); + blackPixels ^= 1; + if (codingLine[a0i] < columns) { + if (b1i > 0) { + --b1i; + } else { + ++b1i; + } + while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) { + b1i += 2; + } + } + break; + case EOF: + addPixels(columns, 0); + eof = gTrue; + break; + default: + error(getPos(), "Bad 2D code %04x in CCITTFax stream", code1); + addPixels(columns, 0); + err = gTrue; + break; + } + } + + // 1-D encoding + } else { + codingLine[0] = 0; + a0i = 0; + blackPixels = 0; + while (codingLine[a0i] < columns) { + code1 = 0; + if (blackPixels) { + do { + code1 += code3 = getBlackCode(); + } while (code3 >= 64); + } else { + do { + code1 += code3 = getWhiteCode(); + } while (code3 >= 64); + } + addPixels(codingLine[a0i] + code1, blackPixels); + blackPixels ^= 1; + } + } + + // byte-align the row + if (byteAlign) { + inputBits &= ~7; + } + + // check for end-of-line marker, skipping over any extra zero bits + gotEOL = gFalse; + if (!endOfBlock && row == rows - 1) { + eof = gTrue; + } else { + code1 = lookBits(12); + while (code1 == 0) { + eatBits(1); + code1 = lookBits(12); + } + if (code1 == 0x001) { + eatBits(12); + gotEOL = gTrue; + } else if (code1 == EOF) { + eof = gTrue; + } + } + + // get 2D encoding tag + if (!eof && encoding > 0) { + nextLine2D = !lookBits(1); + eatBits(1); + } + + // check for end-of-block marker + if (endOfBlock && gotEOL) { + code1 = lookBits(12); + if (code1 == 0x001) { + eatBits(12); + if (encoding > 0) { + lookBits(1); + eatBits(1); + } + if (encoding >= 0) { + for (i = 0; i < 4; ++i) { + code1 = lookBits(12); + if (code1 != 0x001) { + error(getPos(), "Bad RTC code in CCITTFax stream"); + } + eatBits(12); + if (encoding > 0) { + lookBits(1); + eatBits(1); + } + } + } + eof = gTrue; + } + + // look for an end-of-line marker after an error -- we only do + // this if we know the stream contains end-of-line markers because + // the "just plow on" technique tends to work better otherwise + } else if (err && endOfLine) { + while (1) { + code1 = lookBits(13); + if (code1 == EOF) { + eof = gTrue; + return EOF; + } + if ((code1 >> 1) == 0x001) { + break; + } + eatBits(1); + } + eatBits(12); + if (encoding > 0) { + eatBits(1); + nextLine2D = !(code1 & 1); + } + } + + // set up for output + if (codingLine[0] > 0) { + outputBits = codingLine[a0i = 0]; + } else { + outputBits = codingLine[a0i = 1]; + } + + ++row; + } + + // get a byte + if (outputBits >= 8) { + buf = (a0i & 1) ? 0x00 : 0xff; + outputBits -= 8; + if (outputBits == 0 && codingLine[a0i] < columns) { + ++a0i; + outputBits = codingLine[a0i] - codingLine[a0i - 1]; + } + } else { + bits = 8; + buf = 0; + do { + if (outputBits > bits) { + buf <<= bits; + if (!(a0i & 1)) { + buf |= 0xff >> (8 - bits); + } + outputBits -= bits; + bits = 0; + } else { + buf <<= outputBits; + if (!(a0i & 1)) { + buf |= 0xff >> (8 - outputBits); + } + bits -= outputBits; + outputBits = 0; + if (codingLine[a0i] < columns) { + ++a0i; + outputBits = codingLine[a0i] - codingLine[a0i - 1]; + } else if (bits > 0) { + buf <<= bits; + bits = 0; + } + } + } while (bits); + } + if (black) { + buf ^= 0xff; + } + return buf; +} + +short CCITTFaxStream::getTwoDimCode() { + short code; + CCITTCode *p; + int n; + + code = 0; // make gcc happy + if (endOfBlock) { + code = lookBits(7); + p = &twoDimTab1[code]; + if (p->bits > 0) { + eatBits(p->bits); + return p->n; + } + } else { + for (n = 1; n <= 7; ++n) { + code = lookBits(n); + if (n < 7) { + code <<= 7 - n; + } + p = &twoDimTab1[code]; + if (p->bits == n) { + eatBits(n); + return p->n; + } + } + } + error(getPos(), "Bad two dim code (%04x) in CCITTFax stream", code); + return EOF; +} + +short CCITTFaxStream::getWhiteCode() { + short code; + CCITTCode *p; + int n; + + code = 0; // make gcc happy + if (endOfBlock) { + code = lookBits(12); + if (code == EOF) { + return 1; + } + if ((code >> 5) == 0) { + p = &whiteTab1[code]; + } else { + p = &whiteTab2[code >> 3]; + } + if (p->bits > 0) { + eatBits(p->bits); + return p->n; + } + } else { + for (n = 1; n <= 9; ++n) { + code = lookBits(n); + if (code == EOF) { + return 1; + } + if (n < 9) { + code <<= 9 - n; + } + p = &whiteTab2[code]; + if (p->bits == n) { + eatBits(n); + return p->n; + } + } + for (n = 11; n <= 12; ++n) { + code = lookBits(n); + if (code == EOF) { + return 1; + } + if (n < 12) { + code <<= 12 - n; + } + p = &whiteTab1[code]; + if (p->bits == n) { + eatBits(n); + return p->n; + } + } + } + error(getPos(), "Bad white code (%04x) in CCITTFax stream", code); + // eat a bit and return a positive number so that the caller doesn't + // go into an infinite loop + eatBits(1); + return 1; +} + +short CCITTFaxStream::getBlackCode() { + short code; + CCITTCode *p; + int n; + + code = 0; // make gcc happy + if (endOfBlock) { + code = lookBits(13); + if (code == EOF) { + return 1; + } + if ((code >> 7) == 0) { + p = &blackTab1[code]; + } else if ((code >> 9) == 0 && (code >> 7) != 0) { + p = &blackTab2[(code >> 1) - 64]; + } else { + p = &blackTab3[code >> 7]; + } + if (p->bits > 0) { + eatBits(p->bits); + return p->n; + } + } else { + for (n = 2; n <= 6; ++n) { + code = lookBits(n); + if (code == EOF) { + return 1; + } + if (n < 6) { + code <<= 6 - n; + } + p = &blackTab3[code]; + if (p->bits == n) { + eatBits(n); + return p->n; + } + } + for (n = 7; n <= 12; ++n) { + code = lookBits(n); + if (code == EOF) { + return 1; + } + if (n < 12) { + code <<= 12 - n; + } + if (code >= 64) { + p = &blackTab2[code - 64]; + if (p->bits == n) { + eatBits(n); + return p->n; + } + } + } + for (n = 10; n <= 13; ++n) { + code = lookBits(n); + if (code == EOF) { + return 1; + } + if (n < 13) { + code <<= 13 - n; + } + p = &blackTab1[code]; + if (p->bits == n) { + eatBits(n); + return p->n; + } + } + } + error(getPos(), "Bad black code (%04x) in CCITTFax stream", code); + // eat a bit and return a positive number so that the caller doesn't + // go into an infinite loop + eatBits(1); + return 1; +} + +short CCITTFaxStream::lookBits(int n) { + int c; + + while (inputBits < n) { + if ((c = str->getChar()) == EOF) { + if (inputBits == 0) { + return EOF; + } + // near the end of the stream, the caller may ask for more bits + // than are available, but there may still be a valid code in + // however many bits are available -- we need to return correct + // data in this case + return (inputBuf << (n - inputBits)) & (0xffff >> (16 - n)); + } + inputBuf = (inputBuf << 8) + c; + inputBits += 8; + } + return (inputBuf >> (inputBits - n)) & (0xffff >> (16 - n)); +} + +#endif GString *CCITTFaxStream::getPSFilter(char *indent) { GString *s; Index: xpdf/Stream.h =================================================================== --- xpdf/Stream.h.orig +++ xpdf/Stream.h @@ -511,13 +511,15 @@ int row; // current row int inputBuf; // input buffer int inputBits; // number of bits in input buffer - short *refLine; // reference line changing elements - int b1; // index into refLine - short *codingLine; // coding line changing elements - int a0; // index into codingLine + int *codingLine; // coding line changing elements + int *refLine; // reference line changing elements + int a0i; // index into codingLine + GBool err; // error on current line int outputBits; // remaining ouput bits int buf; // character buffer + void addPixels(int a1, int black); + void addPixelsNeg(int a1, int black); short getTwoDimCode(); short getWhiteCode(); short getBlackCode();
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