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Unified Diff: third_party/lua/src/lzio.c

Issue 14907017: add SkLuaCanvas (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: Created 7 years, 7 months ago
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Index: third_party/lua/src/lzio.c
diff --git a/third_party/lua/src/lzio.c b/third_party/lua/src/lzio.c
new file mode 100644
index 0000000000000000000000000000000000000000..8b77054e0b8c7981ddcd5c59597f079a8e0c6e09
--- /dev/null
+++ b/third_party/lua/src/lzio.c
@@ -0,0 +1,76 @@
+/*
+** $Id: lzio.c,v 1.35 2012/05/14 13:34:18 roberto Exp $
+** Buffered streams
+** See Copyright Notice in lua.h
+*/
+
+
+#include <string.h>
+
+#define lzio_c
+#define LUA_CORE
+
+#include "lua.h"
+
+#include "llimits.h"
+#include "lmem.h"
+#include "lstate.h"
+#include "lzio.h"
+
+
+int luaZ_fill (ZIO *z) {
+ size_t size;
+ lua_State *L = z->L;
+ const char *buff;
+ lua_unlock(L);
+ buff = z->reader(L, z->data, &size);
+ lua_lock(L);
+ if (buff == NULL || size == 0)
+ return EOZ;
+ z->n = size - 1; /* discount char being returned */
+ z->p = buff;
+ return cast_uchar(*(z->p++));
+}
+
+
+void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) {
+ z->L = L;
+ z->reader = reader;
+ z->data = data;
+ z->n = 0;
+ z->p = NULL;
+}
+
+
+/* --------------------------------------------------------------- read --- */
+size_t luaZ_read (ZIO *z, void *b, size_t n) {
+ while (n) {
+ size_t m;
+ if (z->n == 0) { /* no bytes in buffer? */
+ if (luaZ_fill(z) == EOZ) /* try to read more */
+ return n; /* no more input; return number of missing bytes */
+ else {
+ z->n++; /* luaZ_fill consumed first byte; put it back */
+ z->p--;
+ }
+ }
+ m = (n <= z->n) ? n : z->n; /* min. between n and z->n */
+ memcpy(b, z->p, m);
+ z->n -= m;
+ z->p += m;
+ b = (char *)b + m;
+ n -= m;
+ }
+ return 0;
+}
+
+/* ------------------------------------------------------------------------ */
+char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n) {
+ if (n > buff->buffsize) {
+ if (n < LUA_MINBUFFER) n = LUA_MINBUFFER;
+ luaZ_resizebuffer(L, buff, n);
+ }
+ return buff->buffer;
+}
+
+
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