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deps/msgpack-c/include/msgpack/unpack_template.h  view on Meta::CPAN

/*
 * MessagePack unpacking routine template
 *
 * Copyright (C) 2008-2010 FURUHASHI Sadayuki
 *
 *    Distributed under the Boost Software License, Version 1.0.
 *    (See accompanying file LICENSE_1_0.txt or copy at
 *    http://www.boost.org/LICENSE_1_0.txt)
 */

#ifndef msgpack_unpack_func
#error msgpack_unpack_func template is not defined
#endif

#ifndef msgpack_unpack_callback
#error msgpack_unpack_callback template is not defined
#endif

#ifndef msgpack_unpack_struct
#error msgpack_unpack_struct template is not defined
#endif

#ifndef msgpack_unpack_struct_decl
#define msgpack_unpack_struct_decl(name) msgpack_unpack_struct(name)
#endif

#ifndef msgpack_unpack_object
#error msgpack_unpack_object type is not defined
#endif

#ifndef msgpack_unpack_user
#error msgpack_unpack_user type is not defined
#endif

#ifndef USE_CASE_RANGE
#if !defined(_MSC_VER)
#define USE_CASE_RANGE
#endif
#endif

#if defined(_KERNEL_MODE)
#undef  assert
#define assert NT_ASSERT
#endif

msgpack_unpack_struct_decl(_stack) {
    msgpack_unpack_object obj;
    size_t count;
    unsigned int ct;
    msgpack_unpack_object map_key;
};

msgpack_unpack_struct_decl(_context) {
    msgpack_unpack_user user;
    unsigned int cs;
    unsigned int trail;
    unsigned int top;
    /*
    msgpack_unpack_struct(_stack)* stack;
    unsigned int stack_size;
    msgpack_unpack_struct(_stack) embed_stack[MSGPACK_EMBED_STACK_SIZE];
    */
    msgpack_unpack_struct(_stack) stack[MSGPACK_EMBED_STACK_SIZE];
};


msgpack_unpack_func(void, _init)(msgpack_unpack_struct(_context)* ctx)
{
    ctx->cs = MSGPACK_CS_HEADER;
    ctx->trail = 0;
    ctx->top = 0;
    /*
    ctx->stack = ctx->embed_stack;
    ctx->stack_size = MSGPACK_EMBED_STACK_SIZE;
    */
    ctx->stack[0].obj = msgpack_unpack_callback(_root)(&ctx->user);
}

/*
msgpack_unpack_func(void, _destroy)(msgpack_unpack_struct(_context)* ctx)
{
    if(ctx->stack_size != MSGPACK_EMBED_STACK_SIZE) {
        free(ctx->stack);
    }
}
*/

msgpack_unpack_func(msgpack_unpack_object, _data)(msgpack_unpack_struct(_context)* ctx)
{
    return (ctx)->stack[0].obj;
}


msgpack_unpack_func(int, _execute)(msgpack_unpack_struct(_context)* ctx, const char* data, size_t len, size_t* off)
{
    assert(len >= *off);
    {
        const unsigned char* p = (unsigned char*)data + *off;
        const unsigned char* const pe = (unsigned char*)data + len;
        const void* n = NULL;

        unsigned int trail = ctx->trail;
        unsigned int cs = ctx->cs;
        unsigned int top = ctx->top;
        msgpack_unpack_struct(_stack)* stack = ctx->stack;
        /*
        unsigned int stack_size = ctx->stack_size;
        */
        msgpack_unpack_user* user = &ctx->user;

        msgpack_unpack_object obj;
        msgpack_unpack_struct(_stack)* c = NULL;

        int ret;

#define push_simple_value(func) \
        ret = msgpack_unpack_callback(func)(user, &obj); \
        if(ret < 0) { goto _failed; } \
        goto _push
#define push_fixed_value(func, arg) \
        ret = msgpack_unpack_callback(func)(user, arg, &obj); \
        if(ret < 0) { goto _failed; } \
        goto _push
#define push_variable_value(func, base, pos, len) \
        ret = msgpack_unpack_callback(func)(user, \
            (const char*)base, (const char*)pos, len, &obj); \
        if(ret < 0) { goto _failed; } \
        goto _push

#define again_fixed_trail(_cs, trail_len) \
        trail = trail_len; \
        cs = _cs; \
        goto _fixed_trail_again
#define again_fixed_trail_if_zero(_cs, trail_len, ifzero) \
        trail = trail_len; \
        if(trail == 0) { goto ifzero; } \
        cs = _cs; \
        goto _fixed_trail_again

#define start_container(func, count_, ct_) \
        if(top >= MSGPACK_EMBED_STACK_SIZE) { \
            ret = MSGPACK_UNPACK_NOMEM_ERROR; \
            goto _failed; \
        } /* FIXME */ \
        ret = msgpack_unpack_callback(func)(user, count_, &stack[top].obj); \
        if(ret < 0) { goto _failed; } \
        if((count_) == 0) { obj = stack[top].obj; goto _push; } \
        stack[top].ct = ct_; \
        stack[top].count = count_; \
        ++top; \
        goto _header_again

#define NEXT_CS(p) \
        ((unsigned int)*p & 0x1f)

#ifdef USE_CASE_RANGE
#define SWITCH_RANGE_BEGIN     switch(*p) {
#define SWITCH_RANGE(FROM, TO) case FROM ... TO:
#define SWITCH_RANGE_DEFAULT   default:
#define SWITCH_RANGE_END       }
#else
#define SWITCH_RANGE_BEGIN     { if(0) {
#define SWITCH_RANGE(FROM, TO) } else if(FROM <= *p && *p <= TO) {
#define SWITCH_RANGE_DEFAULT   } else {
#define SWITCH_RANGE_END       } }
#endif

        if(p == pe) { goto _out; }
        do {
            switch(cs) {
            case MSGPACK_CS_HEADER:
                SWITCH_RANGE_BEGIN
                SWITCH_RANGE(0x00, 0x7f)  // Positive Fixnum
                    push_fixed_value(_uint8, *(uint8_t*)p);
                SWITCH_RANGE(0xe0, 0xff)  // Negative Fixnum
                    push_fixed_value(_int8, *(int8_t*)p);
                SWITCH_RANGE(0xc0, 0xdf)  // Variable
                    switch(*p) {
                    case 0xc0:  // nil
                        push_simple_value(_nil);
                    //case 0xc1:  // string
                    //  again_terminal_trail(NEXT_CS(p), p+1);
                    case 0xc2:  // false
                        push_simple_value(_false);
                    case 0xc3:  // true
                        push_simple_value(_true);
                    case 0xc4: // bin 8
                    case 0xc5: // bin 16
                    case 0xc6: // bin 32
                        again_fixed_trail(NEXT_CS(p), 1 << (((unsigned int)*p) & 0x03));
                    case 0xc7: // ext 8
                    case 0xc8: // ext 16
                    case 0xc9: // ext 32
                        again_fixed_trail(NEXT_CS(p), 1 << ((((unsigned int)*p) + 1) & 0x03));
                    case 0xca:  // float
                    case 0xcb:  // double
                    case 0xcc:  // unsigned int  8
                    case 0xcd:  // unsigned int 16
                    case 0xce:  // unsigned int 32
                    case 0xcf:  // unsigned int 64
                    case 0xd0:  // signed int  8