diff options
Diffstat (limited to 'src/3rdparty/libtiff/libtiff/tif_lzw.c')
| -rw-r--r-- | src/3rdparty/libtiff/libtiff/tif_lzw.c | 59 |
1 files changed, 35 insertions, 24 deletions
diff --git a/src/3rdparty/libtiff/libtiff/tif_lzw.c b/src/3rdparty/libtiff/libtiff/tif_lzw.c index fd9c7a0..9b76dd0 100644 --- a/src/3rdparty/libtiff/libtiff/tif_lzw.c +++ b/src/3rdparty/libtiff/libtiff/tif_lzw.c @@ -1,4 +1,4 @@ -/* $Id: tif_lzw.c,v 1.45 2011-04-02 20:54:09 bfriesen Exp $ */ +/* $Id: tif_lzw.c,v 1.49 2015-08-30 21:07:44 erouault Exp $ */ /* * Copyright (c) 1988-1997 Sam Leffler @@ -94,7 +94,7 @@ typedef struct { unsigned short nbits; /* # of bits/code */ unsigned short maxcode; /* maximum code for lzw_nbits */ unsigned short free_ent; /* next free entry in hash table */ - long nextdata; /* next bits of i/o */ + unsigned long nextdata; /* next bits of i/o */ long nextbits; /* # of valid bits in lzw_nextdata */ int rw_mode; /* preserve rw_mode from init */ @@ -268,6 +268,8 @@ LZWPreDecode(TIFF* tif, uint16 s) if( sp->dec_codetab == NULL ) { tif->tif_setupdecode( tif ); + if( sp->dec_codetab == NULL ) + return (0); } /* @@ -365,7 +367,8 @@ LZWDecode(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s) unsigned char *bp; hcode_t code; int len; - long nbits, nextbits, nextdata, nbitsmask; + long nbits, nextbits, nbitsmask; + unsigned long nextdata; code_t *codep, *free_entp, *maxcodep, *oldcodep; (void) s; @@ -434,16 +437,18 @@ LZWDecode(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s) if (code == CODE_EOI) break; if (code == CODE_CLEAR) { - free_entp = sp->dec_codetab + CODE_FIRST; - _TIFFmemset(free_entp, 0, - (CSIZE - CODE_FIRST) * sizeof (code_t)); - nbits = BITS_MIN; - nbitsmask = MAXCODE(BITS_MIN); - maxcodep = sp->dec_codetab + nbitsmask-1; - NextCode(tif, sp, bp, code, GetNextCode); + do { + free_entp = sp->dec_codetab + CODE_FIRST; + _TIFFmemset(free_entp, 0, + (CSIZE - CODE_FIRST) * sizeof (code_t)); + nbits = BITS_MIN; + nbitsmask = MAXCODE(BITS_MIN); + maxcodep = sp->dec_codetab + nbitsmask-1; + NextCode(tif, sp, bp, code, GetNextCode); + } while (code == CODE_CLEAR); /* consecutive CODE_CLEAR codes */ if (code == CODE_EOI) break; - if (code >= CODE_CLEAR) { + if (code > CODE_CLEAR) { TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "LZWDecode: Corrupted LZW table at scanline %d", tif->tif_row); @@ -653,16 +658,18 @@ LZWDecodeCompat(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s) if (code == CODE_EOI) break; if (code == CODE_CLEAR) { - free_entp = sp->dec_codetab + CODE_FIRST; - _TIFFmemset(free_entp, 0, - (CSIZE - CODE_FIRST) * sizeof (code_t)); - nbits = BITS_MIN; - nbitsmask = MAXCODE(BITS_MIN); - maxcodep = sp->dec_codetab + nbitsmask; - NextCode(tif, sp, bp, code, GetNextCodeCompat); + do { + free_entp = sp->dec_codetab + CODE_FIRST; + _TIFFmemset(free_entp, 0, + (CSIZE - CODE_FIRST) * sizeof (code_t)); + nbits = BITS_MIN; + nbitsmask = MAXCODE(BITS_MIN); + maxcodep = sp->dec_codetab + nbitsmask; + NextCode(tif, sp, bp, code, GetNextCodeCompat); + } while (code == CODE_CLEAR); /* consecutive CODE_CLEAR codes */ if (code == CODE_EOI) break; - if (code >= CODE_CLEAR) { + if (code > CODE_CLEAR) { TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "LZWDecode: Corrupted LZW table at scanline %d", tif->tif_row); @@ -830,13 +837,15 @@ LZWPreEncode(TIFF* tif, uint16 s) } else \ rat = (incount<<8) / outcount; \ } + +/* Explicit 0xff masking to make icc -check=conversions happy */ #define PutNextCode(op, c) { \ nextdata = (nextdata << nbits) | c; \ nextbits += nbits; \ - *op++ = (unsigned char)(nextdata >> (nextbits-8)); \ + *op++ = (unsigned char)((nextdata >> (nextbits-8))&0xff); \ nextbits -= 8; \ if (nextbits >= 8) { \ - *op++ = (unsigned char)(nextdata >> (nextbits-8)); \ + *op++ = (unsigned char)((nextdata >> (nextbits-8))&0xff); \ nextbits -= 8; \ } \ outcount += nbits; \ @@ -866,7 +875,8 @@ LZWEncode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) hcode_t ent; long disp; long incount, outcount, checkpoint; - long nextdata, nextbits; + unsigned long nextdata; + long nextbits; int free_ent, maxcode, nbits; uint8* op; uint8* limit; @@ -1028,7 +1038,7 @@ LZWPostEncode(TIFF* tif) register LZWCodecState *sp = EncoderState(tif); uint8* op = tif->tif_rawcp; long nextbits = sp->lzw_nextbits; - long nextdata = sp->lzw_nextdata; + unsigned long nextdata = sp->lzw_nextdata; long outcount = sp->enc_outcount; int nbits = sp->lzw_nbits; @@ -1042,8 +1052,9 @@ LZWPostEncode(TIFF* tif) sp->enc_oldcode = (hcode_t) -1; } PutNextCode(op, CODE_EOI); + /* Explicit 0xff masking to make icc -check=conversions happy */ if (nextbits > 0) - *op++ = (unsigned char)(nextdata << (8-nextbits)); + *op++ = (unsigned char)((nextdata << (8-nextbits))&0xff); tif->tif_rawcc = (tmsize_t)(op - tif->tif_rawdata); return (1); } |