ec: add crc32_ctx..() to take context parameter.

Add crc32_ctx.. functions to take context parameter.

This allows for multiple instances to exist in parallel.

Signed-off-by: mschilder@google.com
TEST=make buildall -j8 succeeds
BRANCH=none
BUG=b:73832883

Change-Id: I66bbc56377eeebf01c790caad0bc4c7a51a1bc58
Reviewed-on: https://chromium-review.googlesource.com/935825
Commit-Ready: Marius Schilder <mschilder@chromium.org>
Tested-by: Marius Schilder <mschilder@chromium.org>
Reviewed-by: Marius Schilder <mschilder@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>

1 files changed, 32 insertions, 7 deletions

diff --git a/common/crc.c b/common/crc.c
index 31054ad732..79d405eb13 100644
--- a/common/crc.c
+++ b/common/crc.c
@@ -56,9 +56,6 @@ static const uint32_t crc32_tab[] = {
 	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
 };
 
-/* Accumulator for the CRC */
-static uint32_t crc_;
-
 static uint32_t crc32_hash(uint32_t crc, const void *buf, int size)
 {
 	const uint8_t *p;
@@ -73,22 +70,50 @@ static uint32_t crc32_hash(uint32_t crc, const void *buf, int size)
 	return crc;
 }
 
+void crc32_ctx_init(uint32_t *crc)
+{
+	*crc = CRC32_INITIAL;
+}
+
+void crc32_ctx_hash32(uint32_t *crc, uint32_t val)
+{
+	*crc = crc32_hash(*crc, &val, sizeof(val));
+}
+
+void crc32_ctx_hash16(uint32_t *crc, uint16_t val)
+{
+	*crc = crc32_hash(*crc, &val, sizeof(val));
+}
+
+void crc32_ctx_hash8(uint32_t *crc, uint8_t val)
+{
+	*crc = crc32_hash(*crc, &val, sizeof(val));
+}
+
+uint32_t crc32_ctx_result(uint32_t *crc)
+{
+	return *crc ^ 0xFFFFFFFF;
+}
+
+/* Accumulator for the CRC */
+static uint32_t crc_;
+
 void crc32_init(void)
 {
-	crc_ = CRC32_INITIAL;
+	crc32_ctx_init(&crc_);
 }
 
 void crc32_hash32(uint32_t val)
 {
-	crc_ = crc32_hash(crc_, &val, sizeof(uint32_t));
+	crc32_ctx_hash32(&crc_, val);
 }
 
 void crc32_hash16(uint16_t val)
 {
-	crc_ = crc32_hash(crc_, &val, sizeof(uint16_t));
+	crc32_ctx_hash16(&crc_, val);
 }
 
 uint32_t crc32_result(void)
 {
-	return crc_ ^ 0xFFFFFFFF;
+	return crc32_ctx_result(&crc_);
 }