[coreboot] [PATCH] v3: print name of compression algorithm

[Carl-Daniel Hailfinger]

Print name of compression algorithm in addition to the corresponding 
number during boot.
Convert process_file() to use enum compalgo instead of hardcoded 
"1","2","3" and change the control structure from a series of if() 
statements to a switch() statement.

Compile and boot tested on Qemu.

Signed-off-by: Carl-Daniel Hailfinger

Index: LinuxBIOSv3-algonaming/include/lar.h
===================================================================
--- LinuxBIOSv3-algonaming/include/lar.h	(Revision 605)
+++ LinuxBIOSv3-algonaming/include/lar.h	(Arbeitskopie)
@@ -74,6 +74,24 @@
    u64 loadaddress;
 };

+enum compalgo {
+	none = 0,
+	lzma = 1,
+	nrv2b = 2,
+	zeroes = 3,
+	/* invalid should always be the last entry. */
+	invalid
+};
+
+static const char *algo_name[] = {
+	"",
+	"lzma",
+	"nrv2b",
+	"zeroes",
+	/* invalid should always be the last entry. */
+	"invalid"
+};
+
 struct mem_file {
    void *start;
    int len;
Index: LinuxBIOSv3-algonaming/lib/lar.c
===================================================================
--- LinuxBIOSv3-algonaming/lib/lar.c	(Revision 605)
+++ LinuxBIOSv3-algonaming/lib/lar.c	(Arbeitskopie)
@@ -147,36 +147,41 @@

int process_file(const struct mem_file *archive, void *where)
 {
-	printk(BIOS_SPEW, "LAR: Compression algorithm #%i used\n", archive->compression);
+	const char *algoname = algo_name[(archive->compression >= invalid)
+					? invalid : archive->compression];
+	printk(BIOS_SPEW, "LAR: Compression algorithm #%i (%s) used\n",
+		archive->compression, algoname);
+	switch (archive->compression) {
    /* no compression */
-	if (archive->compression == 0) {
+	case none:
    	memcpy(where, archive->start, archive->len);
    	return 0;
-	}
 #ifdef CONFIG_COMPRESSION_LZMA
    /* lzma */
-	unsigned long ulzma(unsigned char *src, unsigned char *dst);
-	if (archive->compression == 1) {
+	case lzma: {
+		unsigned long ulzma(unsigned char *src, unsigned char *dst);
    	ulzma(archive->start, where);
    	return 0;
    }
 #endif
 #ifdef CONFIG_COMPRESSION_NRV2B
    /* nrv2b */
-	unsigned long unrv2b(u8 *src, u8 *dst, unsigned long *ilen_p);
-	if (archive->compression == 2) {
+	case nrv2b: {
+		unsigned long unrv2b(u8 *src, u8 *dst, unsigned long *ilen_p);
    	unsigned long tmp;
    	unrv2b(archive->start, where, &tmp);
    	return 0;
    }
 #endif
    /* zeroes */
-	if (archive->compression == 3) {
+	case zeroes:
    	memset(where, 0, archive->reallen);
    	return 0;
+	default:
+		printk(BIOS_INFO, "LAR: Compression algorithm #%i (%s) not"
+			" supported!\n", archive->compression, algoname);
+		return -1;
    }
-	printk(BIOS_INFO, "LAR: Compression algorithm #%i not supported!\n", archive->compression);
-	return -1;
 }

/**
Index: LinuxBIOSv3-algonaming/util/lar/lar.h
===================================================================
--- LinuxBIOSv3-algonaming/util/lar/lar.h	(Revision 605)
+++ LinuxBIOSv3-algonaming/util/lar/lar.h	(Arbeitskopie)
@@ -92,7 +92,14 @@
    u32 size; /**< Size of the mmaped file */
 };

-enum compalgo { none = 0, lzma = 1, nrv2b = 2, zeroes = 3 };
+enum compalgo {
+	none = 0,
+	lzma = 1,
+	nrv2b = 2,
+	zeroes = 3,
+	/* invalid should always be the last entry. */
+	invalid
+};

typedef void (*compress_func) (char *, int, char *, int *);
 typedef void (*uncompress_func) (char *, int, char *, int);
@@ -128,4 +135,6 @@
    "lzma",
    "nrv2b",
    "zeroes",
+	/* invalid should always be the last entry. */
+	"invalid"
 };