ref: 02a850608753ed9c743dfd6992ad56e4c4ea3d53
parent: 5a2a972aa72c4b827ea784d91c15fd02adee3f71
author: Sigrid Solveig Haflínudóttir <[email protected]>
date: Thu Jul 29 05:00:29 EDT 2021
add amf0 stuff
--- /dev/null
+++ b/amf0.c
@@ -1,0 +1,374 @@
+#include <u.h>
+#include <libc.h>
+#include "amf0.h"
+#include "util.h"
+
+enum {+ Anum,
+ Abool,
+ Astr,
+ Aobj,
+ Aarr = 8,
+ Aend,
+ Alstr = 12,
+};
+
+#define atleast(what, x) do{ \+ if(p == nil) \
+ return nil; \
+ if(e-p < x){ \+ werrstr(what ": buffer short: expected %d, have %d", x, (int)(e-p)); \
+ return nil; \
+ } \
+}while(0)
+
+u8int *
+amf0bool(u8int *p, u8int *e, int v)
+{+ atleast("bool", 2);+ *p++ = Abool;
+ *p++ = !!v;
+ return p;
+}
+
+u8int *
+amf0byte(u8int *p, u8int *e, u8int byte)
+{+ atleast("byte", 1);+ *p++ = byte;
+ return p;
+}
+
+u8int *
+amf0i16(u8int *p, u8int *e, s16int i)
+{+ atleast("i16", 2);+ *p++ = i >> 8;
+ *p++ = i;
+ return p;
+}
+
+u8int *
+amf0i24(u8int *p, u8int *e, s32int i)
+{+ atleast("i24", 3);+ *p++ = i >> 16;
+ *p++ = i >> 8;
+ *p++ = i;
+ return p;
+}
+
+u8int *
+amf0i32(u8int *p, u8int *e, s32int i)
+{+ atleast("i32", 4);+ *p++ = i >> 24;
+ *p++ = i >> 16;
+ *p++ = i >> 8;
+ *p++ = i;
+ return p;
+}
+
+u8int *
+amf0num(u8int *p, u8int *e, double v)
+{+ union {+ double v;
+ u64int u;
+ }x;
+
+ atleast("num", 1+8);+ *p++ = Anum;
+ x.v = v;
+ *p++ = x.u >> 56;
+ *p++ = x.u >> 48;
+ *p++ = x.u >> 40;
+ *p++ = x.u >> 32;
+ *p++ = x.u >> 24;
+ *p++ = x.u >> 16;
+ *p++ = x.u >> 8;
+ *p++ = x.u;
+
+ return p;
+}
+
+u8int *
+amf0str(u8int *p, u8int *e, char *s)
+{+ int n;
+
+ n = strlen(s);
+ if(n <= 0xffff){+ atleast("str", 1+2+n);+ *p++ = Astr;
+ return (u8int*)memmove(amf0i16(p, e, n), s, n) + n;
+ }
+
+ atleast("lstr", 1+4+n);+ *p++ = Alstr;
+ return (u8int*)memmove(amf0i32(p, e, n), s, n) + n;
+}
+
+u8int *
+amf0arr(u8int *p, u8int *e)
+{+ return amf0byte(p, e, Aarr);
+}
+
+u8int *
+amf0obj(u8int *p, u8int *e)
+{+ return amf0byte(p, e, Aobj);
+}
+
+u8int *
+amf0end(u8int *p, u8int *e)
+{+ return amf0i24(p, e, Aend);
+}
+
+static u8int *
+amf0kv(u8int *p, u8int *e, char *name)
+{+ int n;
+
+ if((n = strlen(name)) > 0xffff){+ werrstr("string too long");+ return nil;
+ }
+ atleast("kv", 2+n);+ p = amf0i16(p, e, n);
+
+ return (u8int*)memmove(p, name, n) + n;
+}
+
+u8int *
+amf0kvbool(u8int *p, u8int *e, char *name, int v)
+{+ return amf0bool(amf0kv(p, e, name), e, v);
+}
+
+u8int *
+amf0kvnum(u8int *p, u8int *e, char *name, double v)
+{+ return amf0num(amf0kv(p, e, name), e, v);
+}
+
+u8int *
+amf0kvstr(u8int *p, u8int *e, char *name, char *v)
+{+ return amf0str(amf0kv(p, e, name), e, v);
+}
+
+u8int *
+amf0byteget(u8int *p, u8int *e, u8int *byte)
+{+ atleast("byte", 1);+ *byte = *p;
+ return p+1;
+}
+
+u8int *
+amf0i16get(u8int *p, u8int *e, s16int *i)
+{+ atleast("i16", 2);+ *i = p[0]<<8 | p[1];
+ return p+2;
+}
+
+u8int *
+amf0i24get(u8int *p, u8int *e, s32int *i)
+{+ atleast("i24", 3);+ *i = p[0]<<16 | p[1]<<8 | p[2];
+ return p+3;
+}
+
+u8int *
+amf0i32get(u8int *p, u8int *e, s32int *i)
+{+ atleast("i32", 4);+ *i = p[0]<<24 | p[1]<<16 | p[2]<<8 | p[3];
+ return p+4;
+}
+
+u8int *
+amf0i32leget(u8int *p, u8int *e, s32int *i)
+{+ atleast("i32le", 4);+ *i = p[0] | p[1]<<8 | p[2]<<16 | p[3]<<24;
+ return p+4;
+}
+
+void
+amf0free(Amf0 *a)
+{+ int i;
+
+ if(a == nil)
+ return;
+
+ switch(a->type){+ case Tstr:
+ free(a->str);
+ break;
+ case Tobj:
+ for(i = 0; i < a->obj.n; i++){+ free(a->obj.k[i]);
+ amf0free(a->obj.v[i]);
+ }
+ break;
+ case Tarr:
+ for(i = 0; i < a->arr.n; i++)
+ amf0free(a->arr.v[i]);
+ case Tnum:
+ case Tbool:
+ break;
+ default:
+ sysfatal("unknown amf0 type %d", a->type);+ }
+
+ free(a);
+}
+
+u8int *
+amf0parse(Amf0 **amf0, u8int *p, u8int *e)
+{+ s16int s16;
+ union {+ double v;
+ u64int u;
+ }x;
+ int n;
+ Amf0 *a;
+
+ atleast("type", 1);+
+ a = ecalloc(1, sizeof(Amf0));
+ *amf0 = nil;
+
+ switch(*p++){+ case Anum:
+ atleast("num", 8);+ for(n = 0, x.u = 0; n < 8; n++)
+ x.u = x.u<<8 | *p++;
+ a->type = Tnum;
+ a->num = x.v;
+ break;
+ case Abool:
+ atleast("bool", 1);+ a->type = Tbool;
+ a->bool = *p++;
+ break;
+ case Alstr:
+ if((p = amf0i32get(p, e, &n)) == nil)
+ return nil;
+ if(0){+ case Astr:
+ if((p = amf0i16get(p, e, &s16)) == nil)
+ return nil;
+ n = s16;
+ }
+ atleast("str", n);+ a->str = estrndup(p, n);
+ p += n;
+ break;
+ case Aobj:
+ atleast("obj", 3); /* Aend should be there anyway */+ a->type = Tobj;
+ for(a->obj.n = 0;;){+ if((p = amf0i16get(p, e, &s16)) == nil)
+ break;
+ if(s16 == 0){+ atleast("obj end?", 1);+ if(*p != Aend){+ werrstr("object doesn't end well");+ p = nil;
+ break;
+ }
+ p++;
+ break;
+ }
+ n = s16;
+ atleast("obj key", n);+ a->obj.n++;
+ a->obj.k = erealloc(a->obj.k, sizeof(*a->obj.k)*a->obj.n);
+ a->obj.v = erealloc(a->obj.v, sizeof(*a->obj.v)*a->obj.n);
+ a->obj.k[a->obj.n-1] = estrndup(p, n);
+ p += n;
+ if((p = amf0parse(&a->obj.v[a->obj.n-1], p, e)) == nil){+ werrstr("obj val: %r");+ break;
+ }
+ }
+ break;
+ case Aarr:
+ a->type = Tarr;
+ if((p = amf0i32get(p, e, &a->arr.n)) == nil)
+ break;
+ a->arr.v = emalloc(sizeof(*a->arr.v)*a->arr.n);
+ for(n = 0; n < a->arr.n; n++){+ if((p = amf0parse(&a->arr.v[n], p, e)) == nil){+ werrstr("arr el: %r");+ break;
+ }
+ }
+ if((p = amf0i24get(p, e, &n)) == nil || n != Aend){+ p = nil;
+ werrstr("array doesn't end with Aend");+ }
+ break;
+ case Aend:
+ p = nil;
+ werrstr("unexpected Aend");+ break;
+ default:
+ werrstr("unexpected type %d", p[-1]);+ p = nil;
+ break;
+ }
+
+ if(p == nil)
+ amf0free(a);
+ else
+ *amf0 = a;
+
+ return p;
+}
+
+int
+amf0fmt(Fmt *f)
+{+ Amf0 *a;
+ int i;
+
+ a = va_arg(f->args, Amf0*);
+
+ switch(a->type){+ case Tstr:
+ fmtprint(f, "%#q", a->str);
+ break;
+ case Tobj:
+ fmtprint(f, "{");+ for(i = 0; i < a->obj.n; i++)
+ fmtprint(f, "%s%q:%A", i > 0 ? ", " : "", a->obj.k[i], a->obj.v[i]);
+ fmtprint(f, "}");
+ break;
+ case Tarr:
+ fmtprint(f, "[");
+ for(i = 0; i < a->arr.n; i++)
+ fmtprint(f, "%s%A", i > 0 ? ", " : "", a->arr.v[i]);
+ fmtprint(f, "]");
+ break;
+ case Tnum:
+ fmtprint(f, "%g", a->num);
+ break;
+ case Tbool:
+ fmtprint(f, a->bool ? "true" : "false");
+ break;
+ default:
+ sysfatal("unknown amf0 type %d", a->type);+ }
+
+ return 0;
+}
--- /dev/null
+++ b/amf0.h
@@ -1,0 +1,53 @@
+enum {+ Tstr,
+ Tnum,
+ Tbool,
+ Tarr,
+ Tobj,
+};
+
+typedef struct Amf0 Amf0;
+
+struct Amf0 {+ int type;
+ union {+ char *str;
+ double num;
+ u8int bool;
+ struct {+ Amf0 **v;
+ int n;
+ }arr;
+ struct {+ char **k;
+ Amf0 **v;
+ int n;
+ }obj;
+ };
+};
+
+u8int *amf0i16(u8int *p, u8int *e, s16int i);
+u8int *amf0bool(u8int *p, u8int *e, int v);
+u8int *amf0byte(u8int *p, u8int *e, u8int byte);
+u8int *amf0i24(u8int *p, u8int *e, s32int i);
+u8int *amf0i32(u8int *p, u8int *e, s32int i);
+u8int *amf0num(u8int *p, u8int *e, double v);
+u8int *amf0str(u8int *p, u8int *e, char *s);
+u8int *amf0arr(u8int *p, u8int *e);
+u8int *amf0obj(u8int *p, u8int *e);
+u8int *amf0end(u8int *p, u8int *e);
+u8int *amf0kvnum(u8int *p, u8int *e, char *name, double v);
+u8int *amf0kvstr(u8int *p, u8int *e, char *name, char *v);
+u8int *amf0kvbool(u8int *p, u8int *e, char *name, int v);
+
+u8int *amf0byteget(u8int *p, u8int *e, u8int *byte);
+u8int *amf0i16get(u8int *p, u8int *e, s16int *i);
+u8int *amf0i24get(u8int *p, u8int *e, s32int *i);
+u8int *amf0i32get(u8int *p, u8int *e, s32int *i);
+u8int *amf0i32leget(u8int *p, u8int *e, s32int *i);
+
+u8int *amf0parse(Amf0 **a, u8int *p, u8int *e);
+void amf0free(Amf0 *a);
+
+#pragma varargck type "A" Amf0*
+int amf0fmt(Fmt *f);