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Defer creation of decoder state to LZWSetupDecode(). Don't depend on the

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file access mode being O_RDONLY, as decoding is supported in RDWR mode.
This commit is contained in:
Frank Warmerdam 2003-02-26 19:09:11 +00:00
parent c9663e69a0
commit 2951d4de0f
1 changed files with 32 additions and 30 deletions
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50
libtiff/tif_lzw.c
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@ -1,4 +1,4 @@
/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_lzw.c,v 1.16 2002-08-22 16:50:50 dron Exp $ */
/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_lzw.c,v 1.17 2003-02-26 19:09:11 warmerda Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
@ -193,7 +193,32 @@ LZWSetupDecode(TIFF* tif)
static const char module[] = " LZWSetupDecode";
int code;
if( sp == NULL )
{
/*
* Allocate state block so tag methods have storage to record
* values.
*/
tif->tif_data = (tidata_t) _TIFFmalloc(sizeof(LZWDecodeState));
if (tif->tif_data == NULL)
{
TIFFError("LZWPreDecode", "No space for LZW state block");
return (0);
}
DecoderState(tif)->dec_codetab = NULL;
DecoderState(tif)->dec_decode = NULL;
/*
* Setup predictor setup.
*/
(void) TIFFPredictorInit(tif);
sp = DecoderState(tif);
}
assert(sp != NULL);
if (sp->dec_codetab == NULL) {
sp->dec_codetab = (code_t*)_TIFFmalloc(CSIZE*sizeof (code_t));
if (sp->dec_codetab == NULL) {
@ -684,10 +709,8 @@ static void
LZWCleanup(TIFF* tif)
{
if (tif->tif_data) {
if (tif->tif_mode == O_RDONLY) {
if (DecoderState(tif)->dec_codetab)
_TIFFfree(DecoderState(tif)->dec_codetab);
}
_TIFFfree(tif->tif_data);
tif->tif_data = NULL;
}
@ -705,17 +728,6 @@ int
TIFFInitLZW(TIFF* tif, int scheme)
{
assert(scheme == COMPRESSION_LZW);
/*
* Allocate state block so tag methods have storage to record values.
*/
if (tif->tif_mode == O_RDONLY)
{
tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (LZWDecodeState));
if (tif->tif_data == NULL)
goto bad;
DecoderState(tif)->dec_codetab = NULL;
DecoderState(tif)->dec_decode = NULL;
}
/*
* Install codec methods.
@ -728,17 +740,7 @@ TIFFInitLZW(TIFF* tif, int scheme)
tif->tif_decodetile = LZWDecode;
tif->tif_cleanup = LZWCleanup;
/*
* Setup predictor setup.
*/
if( tif->tif_mode == O_RDONLY )
(void) TIFFPredictorInit(tif);
return (1);
bad:
TIFFError("TIFFInitLZW", "No space for LZW state block");
return (0);
}
/*