summaryrefslogtreecommitdiffstats
path: root/libjpegtwrp/coderules.doc
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--libjpegtwrp/coderules.doc118
1 files changed, 118 insertions, 0 deletions
diff --git a/libjpegtwrp/coderules.doc b/libjpegtwrp/coderules.doc
new file mode 100644
index 000000000..0ab5d9bd3
--- /dev/null
+++ b/libjpegtwrp/coderules.doc
@@ -0,0 +1,118 @@
+IJG JPEG LIBRARY: CODING RULES
+
+Copyright (C) 1991-1996, Thomas G. Lane.
+This file is part of the Independent JPEG Group's software.
+For conditions of distribution and use, see the accompanying README file.
+
+
+Since numerous people will be contributing code and bug fixes, it's important
+to establish a common coding style. The goal of using similar coding styles
+is much more important than the details of just what that style is.
+
+In general we follow the recommendations of "Recommended C Style and Coding
+Standards" revision 6.1 (Cannon et al. as modified by Spencer, Keppel and
+Brader). This document is available in the IJG FTP archive (see
+jpeg/doc/cstyle.ms.tbl.Z, or cstyle.txt.Z for those without nroff/tbl).
+
+Block comments should be laid out thusly:
+
+/*
+ * Block comments in this style.
+ */
+
+We indent statements in K&R style, e.g.,
+ if (test) {
+ then-part;
+ } else {
+ else-part;
+ }
+with two spaces per indentation level. (This indentation convention is
+handled automatically by GNU Emacs and many other text editors.)
+
+Multi-word names should be written in lower case with underscores, e.g.,
+multi_word_name (not multiWordName). Preprocessor symbols and enum constants
+are similar but upper case (MULTI_WORD_NAME). Names should be unique within
+the first fifteen characters. (On some older systems, global names must be
+unique within six characters. We accommodate this without cluttering the
+source code by using macros to substitute shorter names.)
+
+We use function prototypes everywhere; we rely on automatic source code
+transformation to feed prototype-less C compilers. Transformation is done
+by the simple and portable tool 'ansi2knr.c' (courtesy of Ghostscript).
+ansi2knr is not very bright, so it imposes a format requirement on function
+declarations: the function name MUST BEGIN IN COLUMN 1. Thus all functions
+should be written in the following style:
+
+LOCAL(int *)
+function_name (int a, char *b)
+{
+ code...
+}
+
+Note that each function definition must begin with GLOBAL(type), LOCAL(type),
+or METHODDEF(type). These macros expand to "static type" or just "type" as
+appropriate. They provide a readable indication of the routine's usage and
+can readily be changed for special needs. (For instance, special linkage
+keywords can be inserted for use in Windows DLLs.)
+
+ansi2knr does not transform method declarations (function pointers in
+structs). We handle these with a macro JMETHOD, defined as
+ #ifdef HAVE_PROTOTYPES
+ #define JMETHOD(type,methodname,arglist) type (*methodname) arglist
+ #else
+ #define JMETHOD(type,methodname,arglist) type (*methodname) ()
+ #endif
+which is used like this:
+ struct function_pointers {
+ JMETHOD(void, init_entropy_encoder, (int somearg, jparms *jp));
+ JMETHOD(void, term_entropy_encoder, (void));
+ };
+Note the set of parentheses surrounding the parameter list.
+
+A similar solution is used for forward and external function declarations
+(see the EXTERN and JPP macros).
+
+If the code is to work on non-ANSI compilers, we cannot rely on a prototype
+declaration to coerce actual parameters into the right types. Therefore, use
+explicit casts on actual parameters whenever the actual parameter type is not
+identical to the formal parameter. Beware of implicit conversions to "int".
+
+It seems there are some non-ANSI compilers in which the sizeof() operator
+is defined to return int, yet size_t is defined as long. Needless to say,
+this is brain-damaged. Always use the SIZEOF() macro in place of sizeof(),
+so that the result is guaranteed to be of type size_t.
+
+
+The JPEG library is intended to be used within larger programs. Furthermore,
+we want it to be reentrant so that it can be used by applications that process
+multiple images concurrently. The following rules support these requirements:
+
+1. Avoid direct use of file I/O, "malloc", error report printouts, etc;
+pass these through the common routines provided.
+
+2. Minimize global namespace pollution. Functions should be declared static
+wherever possible. (Note that our method-based calling conventions help this
+a lot: in many modules only the initialization function will ever need to be
+called directly, so only that function need be externally visible.) All
+global function names should begin with "jpeg_", and should have an
+abbreviated name (unique in the first six characters) substituted by macro
+when NEED_SHORT_EXTERNAL_NAMES is set.
+
+3. Don't use global variables; anything that must be used in another module
+should be in the common data structures.
+
+4. Don't use static variables except for read-only constant tables. Variables
+that should be private to a module can be placed into private structures (see
+the system architecture document, structure.doc).
+
+5. Source file names should begin with "j" for files that are part of the
+library proper; source files that are not part of the library, such as cjpeg.c
+and djpeg.c, do not begin with "j". Keep source file names to eight
+characters (plus ".c" or ".h", etc) to make life easy for MS-DOSers. Keep
+compression and decompression code in separate source files --- some
+applications may want only one half of the library.
+
+Note: these rules (particularly #4) are not followed religiously in the
+modules that are used in cjpeg/djpeg but are not part of the JPEG library
+proper. Those modules are not really intended to be used in other
+applications.