Initial import of the CDE 2.1.30 sources from the Open Group.

cde/lib/DtHelp/il/ildecompress.c

@@ -0,0 +1,92 @@
+/* $XConsortium: ildecompress.c /main/3 1995/10/23 15:46:32 rswiston $ */
+/**---------------------------------------------------------------------
+***	
+***    (c)Copyright 1991 Hewlett-Packard Co.
+***    
+***                             RESTRICTED RIGHTS LEGEND
+***    Use, duplication, or disclosure by the U.S. Government is subject to
+***    restrictions as set forth in sub-paragraph (c)(1)(ii) of the Rights in
+***    Technical Data and Computer Software clause in DFARS 252.227-7013.
+***                             Hewlett-Packard Company
+***                             3000 Hanover Street
+***                             Palo Alto, CA 94304 U.S.A.
+***    Rights for non-DOD U.S. Government Departments and Agencies are as set
+***    forth in FAR 52.227-19(c)(1,2).
+***
+***-------------------------------------------------------------------*/
+
+#include "ilint.h"
+#include "ilpipelem.h"
+#include "ildecomp.h"
+#include "ilcodec.h"
+#include "ilerrors.h"
+
+/* =================================================================================    
+ 
+           -------------------- ilDecompress() --------------------
+   Add a filter to "pipe" (guaranteed to be a pipe in IL_PIPE_FORMING state)
+   which decompresses the compressed pipe image.
+
+   ================================================================================= */
+
+IL_PRIVATE void _ilDecompress (
+    ilPipe              pipe
+    )
+{
+    unsigned int        state;
+    ilPipeInfo          info;                              
+    ilImageDes          imdes;
+    ilImageFormat       imformat;
+     
+
+    /* Get ptr to pipe info and check state.  We should NOT FORCE decompression */
+    state =  ilGetPipeInfo(pipe, FALSE, &info, &imdes, &imformat);                    
+
+    /* Verify status of the pipe */
+    if (state != IL_PIPE_FORMING) {
+        if (!pipe->context->error) {
+            ilDeclarePipeInvalid(pipe, IL_ERROR_PIPE_STATE);
+            return;
+        }
+    }                          
+
+    /* Call the appropriate decompression function */
+    switch (imdes.compression) {
+            /* Image is already decompressed!  Continue, this is NOT an error! */
+        case IL_UNCOMPRESSED: 
+                break;
+
+        case IL_G3:
+                if (!_ilDecompG3 (pipe, &info, &imdes))
+                    return;
+                break;                       
+
+        case IL_G4:           /* Currently supported CCITT Group4 decompression format */ 
+                if (!_ilDecompG4 (pipe, &info, &imdes))                      
+                    return;                                                               
+                break;                                                                    
+
+        case IL_LZW:          /* Currently supported LZW format */
+                if (!_ilDecompLZW (pipe, &info, &imdes, &imformat))
+                    return;
+                break;                       
+
+        case IL_PACKBITS:
+                if (!_ilDecompPackbits (pipe, &info, &imdes, &imformat))
+                    return;
+                break;                         
+
+        case IL_JPEG:         /* Currently supported JPEG format */
+                if (!_ilDecompJPEG (pipe, &info, &imdes))
+                    return;
+                break;
+        default:              /* imdes.compression is not valid       */
+                ilDeclarePipeInvalid (pipe, IL_ERROR_COMPRESSION);
+                return;
+
+    }  /* end switch */
+
+    pipe->context->error = IL_OK;
+}
+
+