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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2008-2009 Joshua Haberman. See LICENSE for details.
*/
#include "upb_parse.h"
#include <stddef.h>
#include <stdlib.h>
/* May want to move this to upb.c if enough other things warrant it. */
#define alignof(t) offsetof(struct { char c; t x; }, x)
#define TYPE_INFO(proto_type, wire_type, ctype) [proto_type] = {alignof(ctype), sizeof(ctype), wire_type, UPB_STRLIT(#ctype)},
struct upb_type_info upb_type_info[] = {
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_DOUBLE, UPB_WIRE_TYPE_64BIT, double)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_FLOAT, UPB_WIRE_TYPE_32BIT, float)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_INT64, UPB_WIRE_TYPE_VARINT, int64_t)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_UINT64, UPB_WIRE_TYPE_VARINT, uint64_t)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_INT32, UPB_WIRE_TYPE_VARINT, int32_t)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_FIXED64, UPB_WIRE_TYPE_64BIT, uint64_t)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_FIXED32, UPB_WIRE_TYPE_32BIT, uint32_t)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_BOOL, UPB_WIRE_TYPE_VARINT, bool)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_MESSAGE, UPB_WIRE_TYPE_DELIMITED, void*)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_GROUP, UPB_WIRE_TYPE_START_GROUP, void*)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_UINT32, UPB_WIRE_TYPE_VARINT, uint32_t)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_ENUM, UPB_WIRE_TYPE_VARINT, uint32_t)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_SFIXED32, UPB_WIRE_TYPE_32BIT, int32_t)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_SFIXED64, UPB_WIRE_TYPE_64BIT, int64_t)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_SINT32, UPB_WIRE_TYPE_VARINT, int32_t)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_SINT64, UPB_WIRE_TYPE_VARINT, int64_t)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_STRING, UPB_WIRE_TYPE_DELIMITED, struct upb_string*)
TYPE_INFO(GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_BYTES, UPB_WIRE_TYPE_DELIMITED, struct upb_string*)
};
/* This is called by the inline version of the function if the varint turns out
* to be >= 2 bytes. */
upb_status_t upb_get_v_uint64_t_full(uint8_t *buf, uint8_t *end, uint64_t *val,
uint8_t **outbuf)
{
uint8_t *const *maxend = buf + 10;
uint8_t last = 0x80;
*val = 0;
int bitpos;
for(bitpos = 0; buf < (uint8_t*)end && (last & 0x80); buf++, bitpos += 7)
*val |= ((uint64_t)((last = *buf) & 0x7F)) << bitpos;
if(buf >= end && buf <= maxend && (last & 0x80)) return UPB_STATUS_NEED_MORE_DATA;
if(buf > maxend) return UPB_ERROR_UNTERMINATED_VARINT;
*outbuf = buf;
return UPB_STATUS_OK;
}
upb_status_t upb_parse_wire_value(uint8_t *buf, uint8_t *end, upb_wire_type_t wt,
union upb_wire_value *wv, uint8_t **outbuf)
{
switch(wt) {
case UPB_WIRE_TYPE_VARINT: return upb_get_v_uint64_t(buf, end, &wv->varint, outbuf);
case UPB_WIRE_TYPE_64BIT: return upb_get_f_uint64_t(buf, end, &wv->_64bit, outbuf);
case UPB_WIRE_TYPE_32BIT: return upb_get_f_uint32_t(buf, end, &wv->_32bit, outbuf);
default: return UPB_ERROR_ILLEGAL; /* Doesn't handle delimited, groups. */
}
}
static upb_status_t skip_wire_value(uint8_t *buf, uint8_t *end, upb_wire_type_t wt,
uint8_t **outbuf)
{
switch(wt) {
case UPB_WIRE_TYPE_VARINT: return upb_skip_v_uint64_t(buf, end, outbuf);
case UPB_WIRE_TYPE_64BIT: return upb_skip_f_uint64_t(buf, end, outbuf);
case UPB_WIRE_TYPE_32BIT: return upb_skip_f_uint32_t(buf, end, outbuf);
case UPB_WIRE_TYPE_START_GROUP: /* TODO: skip to matching end group. */
case UPB_WIRE_TYPE_END_GROUP: return UPB_STATUS_OK;
default: return UPB_ERROR_ILLEGAL;
}
}
upb_status_t upb_parse_value(uint8_t *buf, uint8_t *end, upb_field_type_t ft,
union upb_value_ptr v, uint8_t **outbuf)
{
#define CASE(t, member_name) \
case GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_ ## t: \
return upb_get_ ## t(buf, end, v.member_name, outbuf);
switch(ft) {
CASE(DOUBLE, _double)
CASE(FLOAT, _float)
CASE(INT32, int32)
CASE(INT64, int64)
CASE(UINT32, uint32)
CASE(UINT64, uint64)
CASE(SINT32, int32)
CASE(SINT64, int64)
CASE(FIXED32, uint32)
CASE(FIXED64, uint64)
CASE(SFIXED32, int32)
CASE(SFIXED64, int64)
CASE(BOOL, _bool)
CASE(ENUM, int32)
default: return UPB_ERROR_ILLEGAL;
}
#undef CASE
}
void upb_parse_reset(struct upb_parse_state *state, void *udata)
{
state->top = state->stack;
state->limit = &state->stack[UPB_MAX_NESTING];
/* The top-level message is not delimited (we can keep receiving data for
* it indefinitely), so we treat it like a group. */
*state->top = 0;
state->completed_offset = 0;
state->udata = udata;
}
void upb_parse_init(struct upb_parse_state *state, void *udata)
{
memset(state, 0, sizeof(struct upb_parse_state)); /* Clear all callbacks. */
upb_parse_reset(state, udata);
}
void upb_parse_free(struct upb_parse_state *state)
{
(void)state;
}
static void *pop_stack_frame(struct upb_parse_state *s, uint8_t *buf)
{
if(s->submsg_end_cb) s->submsg_end_cb(s->udata);
s->top--;
return (char*)buf + (*s->top > 0 ? (*s->top - s->completed_offset) : 0);
}
/* Returns the next end offset. */
static upb_status_t push_stack_frame(struct upb_parse_state *s,
uint8_t *buf, uint32_t len,
void *user_field_desc, uint8_t **submsg_end)
{
s->top++;
if(s->top > s->limit) return UPB_ERROR_STACK_OVERFLOW;
*s->top = s->completed_offset + len;
if(s->submsg_start_cb) s->submsg_start_cb(s->udata, user_field_desc);
*submsg_end = buf + (*s->top > 0 ? (*s->top - s->completed_offset) : 0);
return UPB_STATUS_OK;
}
upb_status_t upb_parse(struct upb_parse_state *s, void *_buf, size_t len,
size_t *read)
{
uint8_t *buf = _buf;
uint8_t *completed = buf;
uint8_t *const start = buf;
uint8_t *end = buf + len;
uint8_t *submsg_end = buf + (*s->top > 0 ? *s->top : 0);
upb_status_t status = UPB_STATUS_OK;
/* Make local copies so optimizer knows they won't change. */
upb_tag_cb tag_cb = s->tag_cb;
upb_str_cb str_cb = s->str_cb;
upb_value_cb value_cb = s->value_cb;
void *udata = s->udata;
/* Main loop: parse a tag, then handle the value. */
while(buf < end) {
struct upb_tag tag;
UPB_CHECK(parse_tag(buf, end, &tag, &buf));
if(tag.wire_type == UPB_WIRE_TYPE_END_GROUP) {
submsg_end = pop_stack_frame(s, start);
completed = buf;
continue;
}
void *udesc;
upb_field_type_t ft = tag_cb(udata, &tag, &udesc);
if(tag.wire_type == UPB_WIRE_TYPE_DELIMITED) {
int32_t delim_len;
UPB_CHECK(upb_get_INT32(buf, end, &delim_len, &buf));
uint8_t *delim_end = buf + delim_len;
if(ft == GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_MESSAGE) {
UPB_CHECK(push_stack_frame(
s, start, delim_end - start, udesc, &submsg_end));
} else {
if(upb_isstringtype(ft))
str_cb(udata, buf, UPB_MIN(delim_end, end) - buf, delim_end - buf, udesc);
else
;/* Set a marker for packed arrays. */
buf = delim_end; /* Note that this could be greater than end. */
}
} else { /* Scalar (non-delimited) value. */
switch(ft) {
case 0: /* Client elected to skip. */
UPB_CHECK(skip_wire_value(buf, end, tag.wire_type, &buf));
break;
case GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_GROUP:
UPB_CHECK(push_stack_frame(s, start, 0, udesc, &submsg_end));
break;
default:
UPB_CHECK(value_cb(udata, buf, end, udesc, &buf));
break;
}
}
while(buf == submsg_end) submsg_end = pop_stack_frame(s, start);
//while(buf < s->packed_end) /* packed arrays. */
// UPB_CHECK(value_cb(udata, buf, end, udesc, &buf));
completed = buf;
}
*read = (char*)completed - (char*)start;
s->completed_offset += *read;
return status;
}
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