X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fpushpull%2Fpull.c;fp=ccan%2Fpushpull%2Fpull.c;h=be26b41d2beac2117968504619ed0f476200b581;hb=17aa322abd7b785330ab49e348144be940b3d1d8;hp=0000000000000000000000000000000000000000;hpb=2ea90b45cf37292aba7c81b34736661c080497de;p=ccan

diff --git a/ccan/pushpull/pull.c b/ccan/pushpull/pull.c
new file mode 100644
index 00000000..be26b41d
--- /dev/null
+++ b/ccan/pushpull/pull.c
@@ -0,0 +1,105 @@
+/* CC0 license (public domain) - see LICENSE file for details */
+#include "pull.h"
+#include <ccan/endian/endian.h>
+#include <string.h>
+
+bool pull_bytes(const char **p, size_t *max_len, void *dst, size_t len)
+{
+	if (*max_len < len) {
+		*p = NULL;
+		*max_len = 0;
+		return false;
+	}
+	if (dst)
+		memcpy(dst, *p, len);
+	*max_len -= len;
+	*p += len;
+	return true;
+}
+
+bool pull_u64(const char **p, size_t *max_len, uint64_t *val)
+{
+	leint64_t v;
+
+	if (pull_bytes(p, max_len, &v, sizeof(v))) {
+		if (val)
+			*val = le64_to_cpu(v);
+		return true;
+	}
+	return false;
+}
+
+bool pull_u32(const char **p, size_t *max_len, uint32_t *val)
+{
+	leint32_t v;
+
+	if (pull_bytes(p, max_len, &v, sizeof(v))) {
+		if (val)
+			*val = le32_to_cpu(v);
+		return true;
+	}
+	return false;
+}
+
+bool pull_u16(const char **p, size_t *max_len, uint16_t *val)
+{
+	leint16_t v;
+
+	if (pull_bytes(p, max_len, &v, sizeof(v))) {
+		if (val)
+			*val = le16_to_cpu(v);
+		return true;
+	}
+	return false;
+}
+
+bool pull_u8(const char **p, size_t *max_len, uint8_t *val)
+{
+	return pull_bytes(p, max_len, val, sizeof(*val));
+}
+
+bool pull_s64(const char **p, size_t *max_len, int64_t *val)
+{
+	leint64_t v;
+
+	if (pull_bytes(p, max_len, &v, sizeof(v))) {
+		if (val)
+			*val = le64_to_cpu(v);
+		return true;
+	}
+	return false;
+}
+
+bool pull_s32(const char **p, size_t *max_len, int32_t *val)
+{
+	leint32_t v;
+
+	if (pull_bytes(p, max_len, &v, sizeof(v))) {
+		if (val)
+			*val = le32_to_cpu(v);
+		return true;
+	}
+	return false;
+}
+
+bool pull_s16(const char **p, size_t *max_len, int16_t *val)
+{
+	leint16_t v;
+
+	if (pull_bytes(p, max_len, &v, sizeof(v))) {
+		if (val)
+			*val = le16_to_cpu(v);
+		return true;
+	}
+	return false;
+}
+
+bool pull_s8(const char **p, size_t *max_len, int8_t *val)
+{
+	return pull_bytes(p, max_len, val, sizeof(*val));
+}
+
+bool pull_char(const char **p, size_t *max_len, char *val)
+{
+	return pull_bytes(p, max_len, val, sizeof(*val));
+}