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-rw-r--r--hl/tools/gif2h5/gifread.c126
1 files changed, 64 insertions, 62 deletions
diff --git a/hl/tools/gif2h5/gifread.c b/hl/tools/gif2h5/gifread.c
index cb033d9..39043f3 100644
--- a/hl/tools/gif2h5/gifread.c
+++ b/hl/tools/gif2h5/gifread.c
@@ -1,85 +1,87 @@
+/*
+ * Copyright (C) 2001 National Center for Supercomputing Applications
+ * All rights reserved.
+ */
#include <stdio.h>
#include <stdlib.h>
+
#include "gif.h"
int EndianOrder;
-static BYTE * ReadDataSubBlocks(BYTE **MemGif2, WORD *DSize);
+static BYTE *ReadDataSubBlocks(BYTE **MemGif2, WORD *DSize);
WORD
-GetWord (MemGif)
-BYTE *MemGif;
+GetWord(BYTE *MemGif)
{
- WORD w;
- if (EndianOrder == 1) /* LittleEndian */
- {
- w = (WORD) (*MemGif++ & 0xFF);
- w |= (WORD) ((*MemGif++ & 0xFF) << 0x08);
- }
- else
- {
- w = (WORD) (*MemGif++ & 0xFF);
- w = ((WORD) (*MemGif++ & 0xFF)) | (w << 0x08);
- }
- return w;
+ WORD w;
+
+ if (EndianOrder == 1) {
+ /* LittleEndian */
+ w = (WORD) (*MemGif++ & 0xFF);
+ w |= (WORD) ((*MemGif++ & 0xFF) << 0x08);
+ } else {
+ w = (WORD) (*MemGif++ & 0xFF);
+ w = ((WORD) (*MemGif++ & 0xFF)) | (w << 0x08);
+ }
+
+ return w;
}
BYTE
-GetByte (MemGif)
-BYTE *MemGif;
+GetByte(BYTE *MemGif)
{
- return *MemGif;
+ return *MemGif;
}
/*
-** Read a GIF image BYTE Header.
-**
-** This function reads the Header, Logical Screen Descriptor, and
-** Global Color Table (if any) from a GIF image file. The information
-** is stored in a GIFHEAD structure.
-**
-** Returns: -1 if a FILE stream error occured during the read,
-** otherwise 0 if no error occured.
-*/
+ * Read a GIF image BYTE Header.
+ *
+ * This function reads the Header, Logical Screen Descriptor, and
+ * Global Color Table (if any) from a GIF image file. The information
+ * is stored in a GIFHEAD structure.
+ *
+ * Returns: -1 if a FILE stream error occured during the read,
+ * otherwise 0 if no error occured.
+ */
int
-ReadGifHeader(GifHead, MemGif2)
-GIFHEAD *GifHead; /* Pointer to GIF header structure */
-BYTE **MemGif2; /* GIF image file input FILE stream */
+ReadGifHeader(GIFHEAD *GifHead, /* Pointer to GIF header structure */
+ BYTE **MemGif2) /* GIF image file input FILE stream */
{
- WORD i; /* Loop counter */
+ WORD i; /* Loop counter */
WORD tableSize; /* Number of entires in the Global Color Table */
-
- GifHead->TableSize = 0;
- for (i = 0 ; i < 6 ; i++) {
- GifHead->HeaderDump[i] = *(*MemGif2)++;
- }
- if (strncmp((const char *)GifHead->HeaderDump , "GIF" , 3)) {
- printf("The file does not appear to be a valid GIF file.\n");
- exit(-1);
- }
-
- for (i = 0 ; i < 7 ; i++) {
- GifHead->LSDDump[i] = *(*MemGif2)++;
- }
- GifHead->PackedField = GifHead->LSDDump[4];
- /* Check if a Global Color Table is present */
- if (GifHead->PackedField & 0x80)
- {
+ GifHead->TableSize = 0;
+ for (i = 0 ; i < 6 ; i++) {
+ GifHead->HeaderDump[i] = *(*MemGif2)++;
+ }
+
+ if (strncmp((const char *)GifHead->HeaderDump , "GIF" , 3)) {
+ printf("The file does not appear to be a valid GIF file.\n");
+ exit(-1);
+ }
+
+ for (i = 0 ; i < 7 ; i++) {
+ GifHead->LSDDump[i] = *(*MemGif2)++;
+ }
+
+ GifHead->PackedField = GifHead->LSDDump[4];
+
+ /* Check if a Global Color Table is present */
+ if (GifHead->PackedField & 0x80) {
/* Read number of color table entries */
tableSize = (WORD) (1L << ((GifHead->PackedField & 0x07) + 1));
- GifHead->TableSize = tableSize;
+ GifHead->TableSize = tableSize;
+
/* Read the Global Color Table */
- /*
- ** There are some changes made here apart from just
- ** reading in the global color table as would
- ** seem intuitively obvious.
- ** The colors are stored in the bottom part of the
- ** palette as opposed to the top
- */
- for (i = 0; i < tableSize; i++)
- {
+ /*
+ * There are some changes made here apart from just reading in the
+ * global color table as would seem intuitively obvious. The colors
+ * are stored in the bottom part of the palette as opposed to the top
+ */
+
+ for (i = 0; i < tableSize; i++) {
GifHead->HDFPalette[i][0] = *(*MemGif2)++;
GifHead->HDFPalette[i][1] = *(*MemGif2)++;
GifHead->HDFPalette[i][2] = *(*MemGif2)++;
@@ -87,12 +89,12 @@ BYTE **MemGif2; /* GIF image file input FILE stream */
}
/* Check for a FILE stream error */
- /*
+#if 0
if (ferror(FpGif))
- return(-1);
- */
+ return -1;
+#endif /* 0 */
- return(0); /* No FILE stream error occured */
+ return 0; /* No FILE stream error occured */
}