Initial import

2020-06-15 07:18:57 -07:00
commit c91b3c5006
14915 changed files with 590219 additions and 0 deletions
--- a/libc/leb128.h
+++ b/libc/leb128.h
@@ -0,0 +1,29 @@
+#ifndef COSMOPOLITAN_LIBC_LEB128_H_
+#define COSMOPOLITAN_LIBC_LEB128_H_
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+
+/**
+ * Decodes a GNU-style varint from a buffer.
+ *
+ * The GNU Assembler is able to encode numbers this way, since it's used
+ * by the DWARF debug format.
+ */
+forceinline int unsleb128(const void *buf, size_t size, int64_t *out) {
+  const unsigned char *p = (const unsigned char *)buf;
+  const unsigned char *pe = (const unsigned char *)buf + size;
+  int64_t res = 0;
+  int bits = 0;
+  unsigned char c;
+  do {
+    if (size && p == pe) return -1;
+    c = *p++;
+    res |= (int64_t)(c & 0x7f) << bits;
+    bits += 7;
+  } while (c & 0x80);
+  if ((c & 0x40) != 0) res |= -1ULL << bits;
+  if (out) *out = res;
+  return p - (const unsigned char *)buf;
+}
+
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_LEB128_H_ */