pushpull: new module.

[ccan] / ccan / pushpull / pull.c

diff --git a/ccan/pushpull/pull.c b/ccan/pushpull/pull.c
new file mode 100644 (file)
index 0000000..be26b41
--- /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));
+}