rnd-19980904-1

[rocksndiamonds.git] / src / gif.h

diff --git a/src/gif.h b/src/gif.h
new file mode 100644 (file)
index 0000000..89c252f
--- /dev/null
+++ b/src/gif.h
@@ -0,0 +1,121 @@
+
+/* gif.h:
+ *
+ * gifin.h
+ * kirk johnson
+ * november 1989
+ * external interface to gifin.c
+ *
+ * Copyright 1989 Kirk L. Johnson (see the included file
+ * "kljcpyrght.h" for complete copyright information)
+ */
+
+/*
+ * gifin return codes
+ */
+#define GIFIN_SUCCESS       0   /* success */
+#define GIFIN_DONE          1   /* no more images */
+
+#define GIFIN_ERR_BAD_SD   -1   /* bad screen descriptor */
+#define GIFIN_ERR_BAD_SEP  -2   /* bad image separator */
+#define GIFIN_ERR_BAD_SIG  -3   /* bad signature */
+#define GIFIN_ERR_EOD      -4   /* unexpected end of raster data */
+#define GIFIN_ERR_EOF      -5   /* unexpected end of input stream */
+#define GIFIN_ERR_FAO      -6   /* file already open */
+#define GIFIN_ERR_IAO      -7   /* image already open */
+#define GIFIN_ERR_NFO      -8   /* no file open */
+#define GIFIN_ERR_NIO      -9   /* no image open */
+#define GIFIN_ERR_PSO      -10  /* pixel stack overflow */
+#define GIFIN_ERR_TAO      -11  /* table overflow */
+#define GIFIN_ERR_BAD_DES  -12  /* bad image descriptor */
+
+#define GIFIN_ERR_BAD_SD_STR   "Bad screen descriptor"
+#define GIFIN_ERR_BAD_SEP_STR  "Bad image separator"
+#define GIFIN_ERR_BAD_SIG_STR  "Bad signature"
+#define GIFIN_ERR_EOD_STR      "Unexpected end of raster data"
+#define GIFIN_ERR_EOF_STR      "Unexpected end of input stream"
+#define GIFIN_ERR_FAO_STR      "File already open"
+#define GIFIN_ERR_IAO_STR      "Image already open"
+#define GIFIN_ERR_NFO_STR      "No file open"
+#define GIFIN_ERR_NIO_STR      "No image open"
+#define GIFIN_ERR_PSO_STR      "Pixel stack overflow"
+#define GIFIN_ERR_TAO_STR      "Table overflow"
+#define GIFIN_ERR_BAD_DES_STR  "Bad image descriptor"
+
+typedef struct {
+    int err_no;
+    char *name;
+    } gif_err_string;
+
+#ifdef GIF_C
+gif_err_string gif_err_strings[] = {
+       {GIFIN_ERR_BAD_SD, GIFIN_ERR_BAD_SD_STR},
+       {GIFIN_ERR_BAD_SEP, GIFIN_ERR_BAD_SEP_STR},
+       {GIFIN_ERR_BAD_SIG, GIFIN_ERR_BAD_SIG_STR},
+       {GIFIN_ERR_EOD, GIFIN_ERR_EOD_STR},
+       {GIFIN_ERR_EOF, GIFIN_ERR_EOF_STR},
+       {GIFIN_ERR_FAO, GIFIN_ERR_FAO_STR},
+       {GIFIN_ERR_IAO, GIFIN_ERR_IAO_STR},
+       {GIFIN_ERR_NFO, GIFIN_ERR_NFO_STR},
+       {GIFIN_ERR_NIO, GIFIN_ERR_NIO_STR},
+       {GIFIN_ERR_PSO, GIFIN_ERR_PSO_STR},
+       {GIFIN_ERR_TAO, GIFIN_ERR_TAO_STR},
+       {GIFIN_ERR_BAD_DES, GIFIN_ERR_BAD_DES_STR},
+       {0}
+    };
+#endif
+
+/*
+ * colormap indices 
+ */
+
+#define GIF_RED  0
+#define GIF_GRN  1
+#define GIF_BLU  2
+
+/*
+ * typedef BYTE for convenience
+ */
+
+typedef unsigned char BYTE;
+
+static int gifin_open_file();
+static int gifin_open_image();
+static int gifin_get_pixel();
+#if 0
+static int gifin_close_image();
+#endif
+static int gifin_close_file();
+static int gifin_load_cmap();
+static int gifin_skip_extension();
+static int gifin_read_data_block();
+static int gifin_add_string();
+
+/* #defines, typedefs, and such
+ */
+
+#define GIF_SIG      "GIF87a"
+#define GIF_SIG_89   "GIF89a"
+
+#define GIF87a 0                /* Gif file version type */
+#define GIF89a 1                /* Gif file version type */
+
+#define GIF_SIG_LEN  6          /* GIF signature length */
+#define GIF_SD_SIZE  7          /* GIF screen descriptor size */
+#define GIF_ID_SIZE  9          /* GIF image descriptor size */
+
+#define GIF_SEPARATOR   ','     /* GIF image separator */
+#define GIF_EXTENSION   '!'     /* GIF extension block marker */
+#define GIF_TERMINATOR  ';'     /* GIF terminator */
+
+#define STAB_SIZE  4096         /* string table size */
+#define PSTK_SIZE  4096         /* pixel stack size */
+
+#define NULL_CODE  -1           /* string table null code */
+
+#ifdef GIF_C
+char *gif_version_name[] = {
+    GIF_SIG,
+    GIF_SIG_89
+    };
+#endif