1 files changed, 109 insertions, 0 deletions
diff --git a/Imaging/libImaging/Gif.h b/Imaging/libImaging/Gif.h
new file mode 100644
index 0000000..8957c39
--- /dev/null
+++ b/Imaging/libImaging/Gif.h
@@ -0,0 +1,109 @@
+/*
+ * The Python Imaging Library.
+ * $Id: Gif.h 2134 2004-10-06 08:55:20Z fredrik $
+ *
+ * Declarations for a fast, suspendable GIF decoder.
+ *
+ * Copyright (c) Fredrik Lundh 1995-96.
+ */
+
+
+/* Max size for a LZW code word. */
+
+#define	GIFBITS	    12
+
+#define	GIFTABLE    (1<<GIFBITS)
+#define	GIFBUFFER   (1<<GIFBITS)
+
+
+typedef struct {
+
+    /* CONFIGURATION */
+
+    /* Initial number of bits. The caller should clear all fields in
+       this structure and set this field before calling the decoder
+       the first time. */
+    int bits;
+
+    /* If set, this is an interlaced image.  Process it the following way:
+     * 1st pass: start at top line, lines are 8 pixels high, step 8 pixels
+     * 2nd pass: start at line 4, lines are 4 pixels high, step 8 pixels
+     * 3rd pass: start at line 2, lines are 2 pixels high, step 4 pixels
+     * 4th pass: start at line 1, lines are 1 pixels high, step 2 pixels
+     */
+    int interlace;
+
+    /* PRIVATE CONTEXT (set by decoder) */
+
+    /* Interlace parameters */
+    int step, repeat;
+
+    /* Input bit buffer */
+    INT32 bitbuffer;
+    int bitcount;
+    int blocksize;
+
+    /* Code buffer */
+    int codesize;
+    int codemask;
+
+    /* Constant symbol codes */
+    int clear, end;
+
+    /* Symbol history */
+    int lastcode;
+    unsigned char lastdata;
+
+    /* History buffer */
+    int bufferindex;
+    unsigned char buffer[GIFTABLE];
+
+    /* Symbol table */
+    unsigned INT16 link[GIFTABLE];
+    unsigned char data[GIFTABLE];
+    int next;
+
+} GIFDECODERSTATE;
+
+typedef struct GIFENCODERBLOCK_T
+{
+    struct GIFENCODERBLOCK_T *next;
+    int size;
+    UINT8 data[255];
+} GIFENCODERBLOCK;
+
+typedef struct {
+
+    /* CONFIGURATION */
+
+    /* Initial number of bits. The caller should clear all fields in
+       this structure and set this field before calling the encoder
+       the first time. */
+    int bits;
+
+    /* NOTE: the expanding encoder ignores this field */
+
+    /* If set, write an interlaced image (see above) */
+    int interlace;
+
+    /* PRIVATE CONTEXT (set by encoder) */
+
+    /* Interlace parameters */
+    int step, repeat;
+
+    /* Output bit buffer */
+    INT32 bitbuffer;
+    int bitcount;
+
+    /* Output buffer list (linked list) */
+    GIFENCODERBLOCK* block; /* current block */
+    GIFENCODERBLOCK* flush; /* output queue */
+    GIFENCODERBLOCK* free; /* if not null, use this */
+
+    /* Fields used for run-length encoding */
+    int first; /* true if we haven't read the first pixel */
+    int last; /* last byte value seen */
+    int count; /* how many bytes with that value we've seen */
+    int lastcode;
+
+} GIFENCODERSTATE;