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JBIG2DEC - add declarations which are not defined in VS 2005

Like INT32_MAX and INT32_MIN, UINT32_MAX which is defined in stdint.h
is not defined for old versions of Visual Studio. Add simple definitions
in the two source files that use it, if it is not already defined.

--- a/jbig2_generic.c

+++ b/jbig2_generic.c

@@ -42,6 +42,10 @@

 #include "jbig2_page.h"

 #include "jbig2_segment.h"

+#if !defined (UINT32_MAX)

+#define UINT32_MAX 0xffffffff

+#endif

+

 /* return the appropriate context size for the given template */

 int

 jbig2_generic_stats_size(Jbig2Ctx *ctx, int template)

--- a/jbig2_segment.c

+++ b/jbig2_segment.c

@@ -39,6 +39,10 @@

 #include "jbig2_symbol_dict.h"

 #include "jbig2_text.h"

+#if !defined (UINT32_MAX)

+#define UINT32_MAX 0xffffffff

+#endif

+

 Jbig2Segment *

 jbig2_parse_segment_header(Jbig2Ctx *ctx, uint8_t *buf, size_t buf_size, size_t *p_header_size)

 {