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authorDuncan Laurie <dlaurie@chromium.org>2016-05-09 10:58:03 -0700
committerDuncan Laurie <dlaurie@google.com>2016-05-21 05:58:51 +0200
commitb9552841bf9d1f59e173d9eb082b6e31423e8496 (patch)
tree9c425294629507cbeea1526c622ccacc2fc8d981
parent9891b4a28b929b82d4121e2d31652af4bdd118ea (diff)
downloadcoreboot-b9552841bf9d1f59e173d9eb082b6e31423e8496.tar.xz
hexstrtobin: Add a library function to decode ASCII hex into binary
This function will turn a string of ASCII hex characters into an array of bytes. It will ignore any non-ASCII-hex characters in the input string and decode up to len bytes of data from it. This can be used for turning MAC addresses or UUID strings into binary for storage or further processing. Sample usage: uint8_t buf[6]; hexstrtobin("00:0e:c6:81:72:01", buf, sizeof(buf)); acpigen_emit_stream(buf, sizeof(buf)); Change-Id: I2de9bd28ae8c42cdca09eec11a3bba497a52988c Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: https://review.coreboot.org/14837 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>
-rw-r--r--src/include/lib.h13
-rw-r--r--src/lib/Makefile.inc1
-rw-r--r--src/lib/hexstrtobin.c44
3 files changed, 58 insertions, 0 deletions
diff --git a/src/include/lib.h b/src/include/lib.h
index 737ab36b83..5bcd07df80 100644
--- a/src/include/lib.h
+++ b/src/include/lib.h
@@ -44,6 +44,19 @@ int checkstack(void *top_of_stack, int core);
void hexdump(const void *memory, size_t length);
void hexdump32(char LEVEL, const void *d, size_t len);
+/*
+ * hexstrtobin - Turn a string of ASCII hex characters into binary
+ *
+ * @str: String of hex characters to parse
+ * @buf: Buffer to store the resulting bytes into
+ * @len: Maximum length of buffer to fill
+ *
+ * Defined in src/lib/hexstrtobin.c
+ * Ignores non-hex characters in the string.
+ * Returns the number of bytes that have been put in the buffer.
+ */
+size_t hexstrtobin(const char *str, uint8_t *buf, size_t len);
+
#if !defined(__ROMCC__)
/* Count Leading Zeroes: clz(0) == 32, clz(0xf) == 28, clz(1 << 31) == 0 */
static inline int clz(u32 x) { return x ? __builtin_clz(x) : sizeof(x) * 8; }
diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc
index 734b517b01..b446e10a35 100644
--- a/src/lib/Makefile.inc
+++ b/src/lib/Makefile.inc
@@ -114,6 +114,7 @@ ramstage-y += cbfs.c
ramstage-$(CONFIG_COMMON_CBFS_SPI_WRAPPER) += cbfs_spi.c
ramstage-y += lzma.c lzmadecode.c
ramstage-y += stack.c
+ramstage-y += hexstrtobin.c
ramstage-y += wrdd.c
ramstage-$(CONFIG_CONSOLE_CBMEM) += cbmem_console.c
ramstage-$(CONFIG_BOOTSPLASH) += jpeg.c
diff --git a/src/lib/hexstrtobin.c b/src/lib/hexstrtobin.c
new file mode 100644
index 0000000000..ed2abc4e8b
--- /dev/null
+++ b/src/lib/hexstrtobin.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but without any warranty; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <lib.h>
+#include <string.h>
+
+size_t hexstrtobin(const char *str, uint8_t *buf, size_t len)
+{
+ size_t count, ptr = 0;
+ uint8_t byte;
+
+ for (byte = count = 0; str && *str; str++) {
+ uint8_t c = *str;
+
+ if (!isxdigit(c))
+ continue;
+ if (isdigit(c))
+ c -= '0';
+ else
+ c = tolower(c) - 'a' + 10;
+
+ byte <<= 4;
+ byte |= c;
+
+ if (++count > 1) {
+ if (ptr >= len)
+ return ptr;
+ buf[ptr++] = byte;
+ byte = count = 0;
+ }
+ }
+
+ return ptr;
+}