File: bytecode_api.c

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/*
 *  ClamAV bytecode internal API
 *
 *  Copyright (C) 2009-2010 Sourcefire, Inc.
 *
 *  Authors: Török Edvin
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#include "clamav-config.h"
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <math.h>
#include <ctype.h>

#include "clamav.h"
#include "cltypes.h"
#include "clambc.h"
#include "bytecode.h"
#include "bytecode_priv.h"
#include "type_desc.h"
#include "bytecode_api.h"
#include "bytecode_api_impl.h"
#include "others.h"
#include "pe.h"
#include "pdf.h"
#include "disasm.h"
#include "scanners.h"
#include "jsparse/js-norm.h"
#include "hashtab.h"
#include "str.h"
#include "filetypes.h"
#if HAVE_JSON
#include "json.h"
#endif

#define EV ctx->bc_events

#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)
#define  API_MISUSE() cli_event_error_str(EV, "API misuse @" TOSTRING(__LINE__ ))

uint32_t cli_bcapi_test1(struct cli_bc_ctx *ctx, uint32_t a, uint32_t b)
{
    UNUSEDPARAM(ctx);
    return (a==0xf00dbeef && b==0xbeeff00d) ? 0x12345678 : 0x55;
}

uint32_t cli_bcapi_test2(struct cli_bc_ctx *ctx, uint32_t a)
{
    UNUSEDPARAM(ctx);
    return a == 0xf00d ? 0xd00f : 0x5555;
}

int32_t cli_bcapi_read(struct cli_bc_ctx* ctx, uint8_t *data, int32_t size)
{
    int n;
    if (!ctx->fmap) {
        API_MISUSE();
        return -1;
    }
    if (size < 0 || size > CLI_MAX_ALLOCATION) {
        cli_warnmsg("bytecode: negative read size: %d\n", size);
        API_MISUSE();
        return -1;
    }
    n = fmap_readn(ctx->fmap, data, ctx->off, size);
    if (n <= 0) {
        cli_dbgmsg("bcapi_read: fmap_readn failed (requested %d)\n", size);
        cli_event_count(EV, BCEV_READ_ERR);
        return n;
    }
    cli_event_int(EV, BCEV_OFFSET, ctx->off);
    cli_event_fastdata(EV, BCEV_READ, data, size);
    //cli_event_data(EV, BCEV_READ, data, n);
    ctx->off += n;
    return n;
}

int32_t cli_bcapi_seek(struct cli_bc_ctx* ctx, int32_t pos, uint32_t whence)
{
    off_t off;
    if (!ctx->fmap) {
        cli_dbgmsg("bcapi_seek: no fmap\n");
        API_MISUSE();
        return -1;
    }
    switch (whence) {
        case 0:
            off = pos;
            break;
        case 1:
            off = ctx->off + pos;
            break;
        case 2:
            off = ctx->file_size + pos;
            break;
        default:
            API_MISUSE();
            cli_dbgmsg("bcapi_seek: invalid whence value\n");
            return -1;
    }
    if (off < 0 || off > ctx->file_size) {
        cli_dbgmsg("bcapi_seek: out of file: %" PRId64 " (max %d)\n",
                   off, ctx->file_size);
        return -1;
    }
    cli_event_int(EV, BCEV_OFFSET, off);
    ctx->off = off;
    return off;
}

uint32_t cli_bcapi_debug_print_str(struct cli_bc_ctx *ctx, const uint8_t *str, uint32_t len)
{
    UNUSEDPARAM(len);
    cli_event_fastdata(EV, BCEV_DBG_STR, str, strlen((const char*)str));
    cli_dbgmsg("bytecode debug: %s\n", str);
    return 0;
}

uint32_t cli_bcapi_debug_print_uint(struct cli_bc_ctx *ctx, uint32_t a)
{
    cli_event_int(EV, BCEV_DBG_INT, a);
    //cli_dbgmsg("bytecode debug: %d\n", a);
    //return 0;
    if (!cli_debug_flag)
        return 0;
    return fprintf(stderr, "%d", a);
}

/*TODO: compiler should make sure that only constants are passed here, and not
 * pointers to arbitrary locations that may not be valid when bytecode finishes
 * executing */
uint32_t cli_bcapi_setvirusname(struct cli_bc_ctx* ctx, const uint8_t *name, uint32_t len)
{
    UNUSEDPARAM(len);
    ctx->virname = (const char*)name;
    return 0;
}

uint32_t cli_bcapi_disasm_x86(struct cli_bc_ctx *ctx, struct DISASM_RESULT *res, uint32_t len)
{
    int n;
    const unsigned char *buf;
    const unsigned char* next;
    UNUSEDPARAM(len);
    if (!res || !ctx->fmap || (size_t)(ctx->off) >= ctx->fmap->len) {
        API_MISUSE();
        return -1;
    }
    /* 32 should be longest instr we support decoding.
     * When we'll support mmx/sse instructions this should be updated! */
    n = MIN(32, ctx->fmap->len - ctx->off);
    buf = fmap_need_off_once(ctx->fmap, ctx->off, n);
    if (buf)
        next = cli_disasm_one(buf, n, res, 0);
    else
        next = NULL;
    if (!next) {
        cli_dbgmsg("bcapi_disasm: failed\n");
        cli_event_count(EV, BCEV_DISASM_FAIL);
        return -1;
    }
    return ctx->off + next - buf;
}

/* TODO: field in ctx, id of last bytecode that called magicscandesc, reset
 * after hooks/other bytecodes are run. TODO: need a more generic solution
 * to avoid uselessly recursing on bytecode-unpacked files, but also a way to
 * override the limit if we need it in a special situation */
int32_t cli_bcapi_write(struct cli_bc_ctx *ctx, uint8_t*data, int32_t len)
{
    char err[128];
    int32_t res;

    cli_ctx *cctx = (cli_ctx*)ctx->ctx;
    if (len < 0) {
        cli_warnmsg("Bytecode API: called with negative length!\n");
        API_MISUSE();
        return -1;
    }
    if (!ctx->outfd) {
        ctx->tempfile = cli_gentemp(cctx ? cctx->engine->tmpdir : NULL);
        if (!ctx->tempfile) {
            cli_dbgmsg("Bytecode API: Unable to allocate memory for tempfile\n");
            cli_event_error_oom(EV, 0);
            return -1;
        }
        ctx->outfd = open(ctx->tempfile, O_RDWR|O_CREAT|O_EXCL|O_TRUNC|O_BINARY, 0600);
        if (ctx->outfd == -1) {
            ctx->outfd = 0;
            cli_warnmsg("Bytecode API: Can't create file %s: %s\n", ctx->tempfile, cli_strerror(errno, err, sizeof(err)));
            cli_event_error_str(EV, "cli_bcapi_write: Can't create temporary file");
            free(ctx->tempfile);
            return -1;
        }
        cli_dbgmsg("bytecode opened new tempfile: %s\n", ctx->tempfile);
    }

    cli_event_fastdata(ctx->bc_events, BCEV_WRITE, data, len);
    if (cli_checklimits("bytecode api", cctx, ctx->written + len, 0, 0))
        return -1;
    res = cli_writen(ctx->outfd, data, len);
    if (res > 0) ctx->written += res;
    if (res == -1) {
        cli_warnmsg("Bytecode API: write failed: %s\n", cli_strerror(errno, err, sizeof(err)));
        cli_event_error_str(EV, "cli_bcapi_write: write failed");
    }
    return res;
}

void cli_bytecode_context_set_trace(struct cli_bc_ctx* ctx, unsigned level,
                                    bc_dbg_callback_trace trace,
                                    bc_dbg_callback_trace_op trace_op,
                                    bc_dbg_callback_trace_val trace_val,
                                    bc_dbg_callback_trace_ptr trace_ptr)
{
    ctx->trace = trace;
    ctx->trace_op = trace_op;
    ctx->trace_val = trace_val;
    ctx->trace_ptr = trace_ptr;
    ctx->trace_level = level;
}

uint32_t cli_bcapi_trace_scope(struct cli_bc_ctx *ctx, const uint8_t *scope, uint32_t scopeid)
{
    if (LIKELY(!ctx->trace_level))
        return 0;
    if (ctx->scope != (const char*)scope) {
        ctx->scope = (const char*)scope ? (const char*)scope : "?";
        ctx->scopeid = scopeid;
        ctx->trace_level |= 0x80;/* temporarely increase level to print params */
    } else if ((ctx->trace_level >= trace_scope) && ctx->scopeid != scopeid) {
        ctx->scopeid = scopeid;
        ctx->trace_level |= 0x40;/* temporarely increase level to print location */
    }
    return 0;
}

uint32_t cli_bcapi_trace_directory(struct cli_bc_ctx *ctx, const uint8_t* dir, uint32_t dummy)
{
    UNUSEDPARAM(dummy);
    if (LIKELY(!ctx->trace_level))
        return 0;
    ctx->directory = (const char*)dir ? (const char*)dir : "";
    return 0;
}

uint32_t cli_bcapi_trace_source(struct cli_bc_ctx *ctx, const uint8_t *file, uint32_t line)
{
    if (LIKELY(ctx->trace_level < trace_line))
        return 0;
    if (ctx->file != (const char*)file || ctx->line != line) {
        ctx->col = 0;
        ctx->file =(const char*)file ? (const char*)file : "??";
        ctx->line = line;
    }
    return 0;
}

uint32_t cli_bcapi_trace_op(struct cli_bc_ctx *ctx, const uint8_t *op, uint32_t col)
{
    if (LIKELY(ctx->trace_level < trace_col))
        return 0;
    if (ctx->trace_level&0xc0) {
        ctx->col = col;
        /* func/scope changed and they needed param/location event */
        ctx->trace(ctx, (ctx->trace_level&0x80) ? trace_func : trace_scope);
        ctx->trace_level &= ~0xc0;
    }
    if (LIKELY(ctx->trace_level < trace_col))
        return 0;
    if (ctx->col != col) {
        ctx->col = col;
        ctx->trace(ctx, trace_col);
    } else {
        ctx->trace(ctx, trace_line);
    }
    if (LIKELY(ctx->trace_level < trace_op))
        return 0;
    if (ctx->trace_op && op)
        ctx->trace_op(ctx, (const char*)op);
    return 0;
}

uint32_t cli_bcapi_trace_value(struct cli_bc_ctx *ctx, const uint8_t* name, uint32_t value)
{
    if (LIKELY(ctx->trace_level < trace_val))
        return 0;
    if (ctx->trace_level&0x80) {
        if ((ctx->trace_level&0x7f) < trace_param)
            return 0;
        ctx->trace(ctx, trace_param);
    }
    if (ctx->trace_val && name)
        ctx->trace_val(ctx, (const char*)name, value);
    return 0;
}

uint32_t cli_bcapi_trace_ptr(struct cli_bc_ctx *ctx, const uint8_t* ptr, uint32_t dummy)
{
    UNUSEDPARAM(dummy);
    if (LIKELY(ctx->trace_level < trace_val))
        return 0;
    if (ctx->trace_level&0x80) {
        if ((ctx->trace_level&0x7f) < trace_param)
            return 0;
        ctx->trace(ctx, trace_param);
    }
    if (ctx->trace_ptr)
        ctx->trace_ptr(ctx, ptr);
    return 0;
}

uint32_t cli_bcapi_pe_rawaddr(struct cli_bc_ctx *ctx, uint32_t rva)
{
  uint32_t ret;
  unsigned err = 0;
  const struct cli_pe_hook_data *pe = ctx->hooks.pedata;
  ret = cli_rawaddr(rva, ctx->sections, pe->nsections, &err,
                    ctx->file_size, pe->hdr_size);
  if (err) {
    cli_dbgmsg("bcapi_pe_rawaddr invalid rva: %u\n", rva);
    return PE_INVALID_RVA;
  }
  return ret;
}

static inline const char* cli_memmem(const char *haystack, unsigned hlen,
                                     const unsigned char *needle, unsigned nlen)
{
    const char *p;
    unsigned char c;
    if (!needle || !haystack) {
        return NULL;
    }
    c = *needle++;
    if (nlen == 1)
        return memchr(haystack, c, hlen);

    while (hlen >= nlen) {
        p = haystack;
        haystack = memchr(haystack, c, hlen - nlen + 1);
        if (!haystack)
            return NULL;
        hlen -= haystack+1 - p;
        p = haystack + 1;
        if (!memcmp(p, needle, nlen-1))
            return haystack;
        haystack = p;
    }
    return NULL;
}

int32_t cli_bcapi_file_find(struct cli_bc_ctx *ctx, const uint8_t* data, uint32_t len)
{
    fmap_t *map = ctx->fmap;
    if (!map || len <= 0) {
        cli_dbgmsg("bcapi_file_find preconditions not met\n");
        API_MISUSE();
        return -1;
    }
    return cli_bcapi_file_find_limit(ctx, data, len, map->len);
}

int32_t cli_bcapi_file_find_limit(struct cli_bc_ctx *ctx , const uint8_t* data, uint32_t len, int32_t limit)
{
    char buf[4096];
    fmap_t *map = ctx->fmap;
    uint32_t off = ctx->off;
    int n;

    if (!map || len > sizeof(buf)/4 || len <= 0 || limit <= 0) {
        cli_dbgmsg("bcapi_file_find_limit preconditions not met\n");
        API_MISUSE();
        return -1;
    }

    cli_event_int(EV, BCEV_OFFSET, off);
    cli_event_fastdata(EV, BCEV_FIND, data, len);
    for (;;) {
        const char *p;
        int32_t readlen = sizeof(buf);
        if (off + readlen > (unsigned int)limit) {
            readlen = limit - off;
            if (readlen < 0)
                return -1;
        }
        n = fmap_readn(map, buf, off, readlen);
        if ((unsigned)n < len || n < 0)
            return -1;
        p = cli_memmem(buf, n, data, len);
        if (p)
            return off + p - buf;
        off += n;
    }
    return -1;
}

int32_t cli_bcapi_file_byteat(struct cli_bc_ctx *ctx, uint32_t off)
{
    unsigned char c;
    if (!ctx->fmap) {
        cli_dbgmsg("bcapi_file_byteat: no fmap\n");
        return -1;
    }
    cli_event_int(EV, BCEV_OFFSET, off);
    if (fmap_readn(ctx->fmap, &c, off, 1) != 1) {
        cli_dbgmsg("bcapi_file_byteat: fmap_readn failed at %u\n", off);
        return -1;
    }
    return c;
}

uint8_t* cli_bcapi_malloc(struct cli_bc_ctx *ctx, uint32_t size)
{
    void *v;
#if USE_MPOOL
    if (!ctx->mpool) {
        ctx->mpool = mpool_create();
        if (!ctx->mpool) {
            cli_dbgmsg("bytecode: mpool_create failed!\n");
            cli_event_error_oom(EV, 0);
            return NULL;
        }
    }
    v = mpool_malloc(ctx->mpool, size);
#else
    /* TODO: implement using a list of pointers we allocated! */
    cli_errmsg("cli_bcapi_malloc not implemented for systems without mmap yet!\n");
    v = cli_malloc(size);
#endif
    if (!v)
        cli_event_error_oom(EV, size);
    return v;
}

int32_t cli_bcapi_get_pe_section(struct cli_bc_ctx *ctx, struct cli_exe_section* section, uint32_t num)
{
    if (num < ctx->hooks.pedata->nsections) {
        memcpy(section, &ctx->sections[num], sizeof(struct cli_exe_section));
        return 0;
    }
    return -1;
}

int32_t cli_bcapi_fill_buffer(struct cli_bc_ctx *ctx, uint8_t* buf,
                              uint32_t buflen, uint32_t filled,
                              uint32_t pos, uint32_t fill)
{
    int32_t res, remaining, tofill;
    UNUSEDPARAM(fill);
    if (!buf || !buflen || buflen > CLI_MAX_ALLOCATION || filled > buflen) {
        cli_dbgmsg("fill_buffer1\n");
        API_MISUSE();
        return -1;
    }
    if (ctx->off >= ctx->file_size) {
        cli_dbgmsg("fill_buffer2\n");
        API_MISUSE();
        return 0;
    }
    remaining = filled - pos;
    if (remaining) {
        if (!CLI_ISCONTAINED(buf, buflen, buf+pos, remaining)) {
            cli_dbgmsg("fill_buffer3\n");
            API_MISUSE();
            return -1;
        }
        memmove(buf, buf+pos, remaining);
    }
    tofill = buflen - remaining;
    if (!CLI_ISCONTAINED(buf, buflen, buf+remaining, tofill)) {
        cli_dbgmsg("fill_buffer4\n");
        API_MISUSE();
        return -1;
    }
    res = cli_bcapi_read(ctx, buf+remaining, tofill);
    if (res <= 0) {
        cli_dbgmsg("fill_buffer5\n");
        API_MISUSE();
        return res;
    }
    return remaining + res;
}

int32_t cli_bcapi_extract_new(struct cli_bc_ctx *ctx, int32_t id)
{
    cli_ctx *cctx;
    int res = -1;

    cli_event_count(EV, BCEV_EXTRACTED);
    cli_dbgmsg("previous tempfile had %u bytes\n", ctx->written);
    if (!ctx->written)
        return 0;
    if (ctx->ctx && cli_updatelimits(ctx->ctx, ctx->written))
        return -1;
    ctx->written = 0;
    if (lseek(ctx->outfd, 0, SEEK_SET) == -1) {
        cli_dbgmsg("bytecode: call to lseek() has failed\n");
        return CL_ESEEK;
    }
    cli_dbgmsg("bytecode: scanning extracted file %s\n", ctx->tempfile);
    cctx = (cli_ctx*)ctx->ctx;
    if (cctx) {
        cli_file_t current = cctx->container_type;
        if (ctx->containertype != CL_TYPE_ANY)
            cctx->container_type = ctx->containertype;
        cctx->recursion++;
        res = cli_magic_scandesc(ctx->outfd, cctx);
        cctx->recursion--;
        cctx->container_type = current;
        if (res == CL_VIRUS) {
            ctx->virname = cli_get_last_virus(cctx);
            ctx->found = 1;
        }
    }
    if ((cctx && cctx->engine->keeptmp) ||
        (ftruncate(ctx->outfd, 0) == -1)) {

        close(ctx->outfd);
        if (!(cctx && cctx->engine->keeptmp) && ctx->tempfile)
            cli_unlink(ctx->tempfile);
        free(ctx->tempfile);
        ctx->tempfile = NULL;
        ctx->outfd = 0;
    }
    cli_dbgmsg("bytecode: extracting new file with id %u\n", id);
    return res;
}

#define BUF 16
int32_t cli_bcapi_read_number(struct cli_bc_ctx *ctx, uint32_t radix)
{
    unsigned i;
    const char *p;
    int32_t result;

    if ((radix != 10 && radix != 16) || !ctx->fmap)
        return -1;
    cli_event_int(EV, BCEV_OFFSET, ctx->off);
    while ((p = fmap_need_off_once(ctx->fmap, ctx->off, BUF))) {
        for (i=0;i<BUF;i++) {
            if ((p[i] >= '0' && p[i] <= '9') || (radix == 16 && ((p[i] >= 'a' && p[i] <= 'f') || (p[i] >= 'A' && p[i] <= 'F')))) {
                char *endptr;
                p = fmap_need_ptr_once(ctx->fmap, p+i, 16);
                if (!p)
                    return -1;
                result = strtoul(p, &endptr, radix);
                ctx->off += i + (endptr - p);
                return result;
            }
        }
        ctx->off += BUF;
    }
    return -1;
}

int32_t cli_bcapi_hashset_new(struct cli_bc_ctx *ctx )
{
    unsigned  n = ctx->nhashsets+1;
    struct cli_hashset *s = cli_realloc(ctx->hashsets, sizeof(*ctx->hashsets)*n);
    if (!s) {
        cli_event_error_oom(EV, 0);
        return -1;
    }
    ctx->hashsets = s;
    ctx->nhashsets = n;
    s = &s[n-1];
    cli_hashset_init(s, 16, 80);
    return n-1;
}

static struct cli_hashset *get_hashset(struct cli_bc_ctx *ctx, int32_t id)
{
    if (id < 0 || (unsigned int)id >= ctx->nhashsets || !ctx->hashsets) {
        API_MISUSE();
        return NULL;
    }
    return &ctx->hashsets[id];
}

int32_t cli_bcapi_hashset_add(struct cli_bc_ctx *ctx , int32_t id, uint32_t key)
{
    struct cli_hashset *s = get_hashset(ctx, id);
    if (!s)
        return -1;
    return cli_hashset_addkey(s, key);
}

int32_t cli_bcapi_hashset_remove(struct cli_bc_ctx *ctx , int32_t id, uint32_t key)
{
    struct cli_hashset *s = get_hashset(ctx, id);
    if (!s)
        return -1;
    return cli_hashset_removekey(s, key);
}

int32_t cli_bcapi_hashset_contains(struct cli_bc_ctx *ctx , int32_t id, uint32_t key)
{
    struct cli_hashset *s = get_hashset(ctx, id);
    if (!s)
        return -1;
    return cli_hashset_contains(s, key);
}

int32_t cli_bcapi_hashset_empty(struct cli_bc_ctx *ctx, int32_t id)
{
    struct cli_hashset *s = get_hashset(ctx, id);
    return s ? !s->count : 1;
}

int32_t cli_bcapi_hashset_done(struct cli_bc_ctx *ctx , int32_t id)
{
    struct cli_hashset *s = get_hashset(ctx, id);
    if (!s)
        return -1;
    cli_hashset_destroy(s);
    if ((unsigned int)id == ctx->nhashsets-1) {
        ctx->nhashsets--;
        if (!ctx->nhashsets) {
            free(ctx->hashsets);
            ctx->hashsets = NULL;
        } else {
            s = cli_realloc(ctx->hashsets, ctx->nhashsets*sizeof(*s));
            if (s)
                ctx->hashsets = s;
        }
    }
    return 0;
}

int32_t cli_bcapi_buffer_pipe_new(struct cli_bc_ctx *ctx, uint32_t size)
{
    unsigned char *data;
    struct bc_buffer *b;
    unsigned n = ctx->nbuffers + 1;

    data = cli_calloc(1, size);
    if (!data)
        return -1;
    b = cli_realloc(ctx->buffers, sizeof(*ctx->buffers)*n);
    if (!b) {
        free(data);
        return -1;
    }
    ctx->buffers = b;
    ctx->nbuffers = n;
    b = &b[n-1];

    b->data = data;
    b->size = size;
    b->write_cursor = b->read_cursor = 0;
    return n-1;
}

int32_t cli_bcapi_buffer_pipe_new_fromfile(struct cli_bc_ctx *ctx , uint32_t at)
{
    struct bc_buffer *b;
    unsigned n = ctx->nbuffers + 1;

    if (at >= ctx->file_size)
        return -1;

    b = cli_realloc(ctx->buffers, sizeof(*ctx->buffers)*n);
    if (!b) {
        return -1;
    }
    ctx->buffers = b;
    ctx->nbuffers = n;
    b = &b[n-1];

    /* NULL data means read from file at pos read_cursor */
    b->data = NULL;
    b->size = 0;
    b->read_cursor = at;
    b->write_cursor = 0;
    return n-1;
}

static struct bc_buffer *get_buffer(struct cli_bc_ctx *ctx, int32_t id)
{
    if (!ctx->buffers || id < 0 || (unsigned int)id >= ctx->nbuffers) {
        cli_dbgmsg("bytecode api: invalid buffer id %u\n", id);
        return NULL;
    }
    return &ctx->buffers[id];
}

uint32_t cli_bcapi_buffer_pipe_read_avail(struct cli_bc_ctx *ctx , int32_t id)
{
    struct bc_buffer *b = get_buffer(ctx, id);
    if (!b)
        return 0;
    if (b->data) {
        if (b->write_cursor <= b->read_cursor)
            return 0;
        return b->write_cursor - b->read_cursor;
    }
    if (!ctx->fmap || b->read_cursor >= ctx->file_size)
        return 0;
    if (b->read_cursor + BUFSIZ <= ctx->file_size)
        return BUFSIZ;
    return ctx->file_size - b->read_cursor;
}

const uint8_t* cli_bcapi_buffer_pipe_read_get(struct cli_bc_ctx *ctx , int32_t id, uint32_t size)
{
    struct bc_buffer *b = get_buffer(ctx, id);
    if (!b || size > cli_bcapi_buffer_pipe_read_avail(ctx, id) || !size)
        return NULL;
    if (b->data)
        return b->data + b->read_cursor;
    return fmap_need_off(ctx->fmap, b->read_cursor, size);
}

int32_t cli_bcapi_buffer_pipe_read_stopped(struct cli_bc_ctx *ctx , int32_t id, uint32_t amount)
{
    struct bc_buffer *b = get_buffer(ctx, id);
    if (!b)
        return -1;
    if (b->data) {
        if (b->write_cursor <= b->read_cursor)
            return -1;
        if (b->read_cursor + amount > b->write_cursor)
            b->read_cursor = b->write_cursor;
        else
            b->read_cursor += amount;
        if (b->read_cursor >= b->size &&
            b->write_cursor >= b->size)
            b->read_cursor = b->write_cursor = 0;
        return 0;
    }
    b->read_cursor += amount;
    return 0;
}

uint32_t cli_bcapi_buffer_pipe_write_avail(struct cli_bc_ctx *ctx, int32_t id)
{
    struct bc_buffer *b = get_buffer(ctx, id);
    if (!b)
        return 0;
    if (!b->data)
        return 0;
    if (b->write_cursor >= b->size)
        return 0;
    return b->size - b->write_cursor;
}

uint8_t* cli_bcapi_buffer_pipe_write_get(struct cli_bc_ctx *ctx, int32_t id, uint32_t size)
{
    struct bc_buffer *b = get_buffer(ctx, id);
    if (!b || size > cli_bcapi_buffer_pipe_write_avail(ctx, id) || !size)
        return NULL;
    if (!b->data)
        return NULL;
    return b->data + b->write_cursor;
}

int32_t cli_bcapi_buffer_pipe_write_stopped(struct cli_bc_ctx *ctx , int32_t id, uint32_t size)
{
    struct bc_buffer *b = get_buffer(ctx, id);
    if (!b || !b->data)
        return -1;
    if (b->write_cursor + size >= b->size)
        b->write_cursor = b->size;
    else
        b->write_cursor += size;
    return 0;
}

int32_t cli_bcapi_buffer_pipe_done(struct cli_bc_ctx *ctx , int32_t id)
{
    struct bc_buffer *b = get_buffer(ctx, id);
    if (!b)
        return -1;
    free(b->data);
    b->data = NULL;
    return -0;
}

int32_t cli_bcapi_inflate_init(struct cli_bc_ctx *ctx, int32_t from, int32_t to, int32_t windowBits)
{
    int ret;
    z_stream stream;
    struct bc_inflate *b;
    unsigned n = ctx->ninflates + 1;
    if (!get_buffer(ctx, from) || !get_buffer(ctx, to)) {
        cli_dbgmsg("bytecode api: inflate_init: invalid buffers!\n");
        return -1;
    }
    memset(&stream, 0, sizeof(stream));
    ret = inflateInit2(&stream, windowBits);
    switch (ret) {
        case Z_MEM_ERROR:
            cli_dbgmsg("bytecode api: inflateInit2: out of memory!\n");
            return -1;
        case Z_VERSION_ERROR:
            cli_dbgmsg("bytecode api: inflateinit2: zlib version error!\n");
            return -1;
        case Z_STREAM_ERROR:
            cli_dbgmsg("bytecode api: inflateinit2: zlib stream error!\n");
            return -1;
        case Z_OK:
            break;
        default:
            cli_dbgmsg("bytecode api: inflateInit2: unknown error %d\n", ret);
            return -1;
    }

    b = cli_realloc(ctx->inflates, sizeof(*ctx->inflates)*n);
    if (!b) {
        inflateEnd(&stream);
        return -1;
    }
    ctx->inflates = b;
    ctx->ninflates = n;
    b = &b[n-1];

    b->from = from;
    b->to = to;
    b->needSync = 0;
    memcpy(&b->stream, &stream, sizeof(stream));
    return n-1;
}

static struct bc_inflate *get_inflate(struct cli_bc_ctx *ctx, int32_t id)
{
    if (id < 0 || (unsigned int)id >= ctx->ninflates || !ctx->inflates)
        return NULL;
    return &ctx->inflates[id];
}

int32_t cli_bcapi_inflate_process(struct cli_bc_ctx *ctx , int32_t id)
{
    int ret;
    unsigned avail_in_orig, avail_out_orig;
    struct bc_inflate *b = get_inflate(ctx, id);
    if (!b || b->from == -1 || b->to == -1)
        return -1;

    b->stream.avail_in = avail_in_orig =
        cli_bcapi_buffer_pipe_read_avail(ctx, b->from);

    b->stream.next_in = (void*)cli_bcapi_buffer_pipe_read_get(ctx, b->from,
                                                       b->stream.avail_in);

    b->stream.avail_out = avail_out_orig =
        cli_bcapi_buffer_pipe_write_avail(ctx, b->to);

    b->stream.next_out = cli_bcapi_buffer_pipe_write_get(ctx, b->to,
                                                         b->stream.avail_out);

    if (!b->stream.avail_in || !b->stream.avail_out || !b->stream.next_in || !b->stream.next_out)
        return -1;
    /* try hard to extract data, skipping over corrupted data */
    do {
        if (!b->needSync) {
            ret = inflate(&b->stream, Z_NO_FLUSH);
            if (ret == Z_DATA_ERROR) {
                cli_dbgmsg("bytecode api: inflate at %lu: %s, trying to recover\n", b->stream.total_in,
                           b->stream.msg);
                b->needSync = 1;
            }
        }
        if (b->needSync) {
            ret = inflateSync(&b->stream);
            if (ret == Z_OK) {
                cli_dbgmsg("bytecode api: successfully recovered inflate stream\n");
                b->needSync = 0;
                continue;
            }
        }
        break;
    } while (1);
    cli_bcapi_buffer_pipe_read_stopped(ctx, b->from, avail_in_orig - b->stream.avail_in);
    cli_bcapi_buffer_pipe_write_stopped(ctx, b->to, avail_out_orig - b->stream.avail_out);

    if (ret == Z_MEM_ERROR) {
        cli_dbgmsg("bytecode api: out of memory!\n");
        cli_bcapi_inflate_done(ctx, id);
        return ret;
    }
    if (ret == Z_STREAM_END) {
        cli_bcapi_inflate_done(ctx, id);
    }
    if (ret == Z_BUF_ERROR) {
        cli_dbgmsg("bytecode api: buffer error!\n");
    }

    return ret;
}

int32_t cli_bcapi_inflate_done(struct cli_bc_ctx *ctx , int32_t id)
{
    int ret;
    struct bc_inflate *b = get_inflate(ctx, id);
    if (!b || b->from == -1 || b->to == -1)
        return -1;
    ret = inflateEnd(&b->stream);
    if (ret == Z_STREAM_ERROR)
        cli_dbgmsg("bytecode api: inflateEnd: %s\n", b->stream.msg);
    b->from = b->to = -1;
    return ret;
}

int32_t cli_bcapi_bytecode_rt_error(struct cli_bc_ctx *ctx , int32_t id)
{
    int32_t line = id >> 8;
    int32_t col = id&0xff;
    UNUSEDPARAM(ctx);
    cli_warnmsg("Bytecode runtime error at line %u, col %u\n", line, col);
    return 0;
}

int32_t cli_bcapi_jsnorm_init(struct cli_bc_ctx *ctx, int32_t from)
{
    struct parser_state *state;
    struct bc_jsnorm *b;
    unsigned  n = ctx->njsnorms + 1;
    if (!get_buffer(ctx, from)) {
        cli_dbgmsg("bytecode api: jsnorm_init: invalid buffers!\n");
        return -1;
    }
    state = cli_js_init();
    if (!state)
        return -1;
    b = cli_realloc(ctx->jsnorms, sizeof(*ctx->jsnorms)*n);
    if (!b) {
        cli_js_destroy(state);
        return -1;
    }
    ctx->jsnorms = b;
    ctx->njsnorms = n;
    b = &b[n-1];
    b->from = from;
    b->state = state;
    if (!ctx->jsnormdir) {
        cli_ctx *cctx = (cli_ctx*)ctx->ctx;
        ctx->jsnormdir = cli_gentemp(cctx ? cctx->engine->tmpdir : NULL);
        if (ctx->jsnormdir) {
            if (mkdir(ctx->jsnormdir, 0700)) {
                cli_dbgmsg("js: can't create temp dir %s\n", ctx->jsnormdir);
                free(ctx->jsnormdir);
                return CL_ETMPDIR;
            }
        }
    }
    return n-1;
}

static struct bc_jsnorm *get_jsnorm(struct cli_bc_ctx *ctx, int32_t id)
{
    if (id < 0 || (unsigned int)id >= ctx->njsnorms || !ctx->jsnorms)
        return NULL;
    return &ctx->jsnorms[id];
}

int32_t cli_bcapi_jsnorm_process(struct cli_bc_ctx *ctx, int32_t id)
{
    unsigned avail;
    const unsigned char *in;
    cli_ctx *cctx = ctx->ctx;
    struct bc_jsnorm *b = get_jsnorm(ctx, id);
    if (!b || b->from == -1 || !b->state)
        return -1;

    avail = cli_bcapi_buffer_pipe_read_avail(ctx, b->from);
    in = cli_bcapi_buffer_pipe_read_get(ctx, b->from, avail);
    if (!avail || !in)
        return -1;
    if (cctx && cli_checklimits("bytecode js api", cctx, ctx->jsnormwritten + avail, 0, 0))
        return -1;
    cli_bcapi_buffer_pipe_read_stopped(ctx, b->from, avail);
    cli_js_process_buffer(b->state, (char*)in, avail);
    return 0;
}

int32_t cli_bcapi_jsnorm_done(struct cli_bc_ctx *ctx , int32_t id)
{
    struct bc_jsnorm *b = get_jsnorm(ctx, id);
    if (!b || b->from == -1)
        return -1;
    if (ctx->ctx && cli_updatelimits(ctx->ctx, ctx->jsnormwritten))
        return -1;
    ctx->jsnormwritten = 0;
    cli_js_parse_done(b->state);
    cli_js_output(b->state, ctx->jsnormdir);
    cli_js_destroy(b->state);
    b->from = -1;
    return 0;
}

static inline double myround(double a)
{
    if (a < 0)
        return a-0.5;
    return a+0.5;
}

int32_t cli_bcapi_ilog2(struct cli_bc_ctx *ctx, uint32_t a, uint32_t b)
{
    double f;
    UNUSEDPARAM(ctx);
    if (!b)
        return 0x7fffffff;
    /* log(a/b) is -32..32, so 2^26*32=2^31 covers the entire range of int32 */
    f = (1<<26)*log((double)a / b) / log(2);
    return (int32_t)myround(f);
}

int32_t cli_bcapi_ipow(struct cli_bc_ctx *ctx, int32_t a, int32_t b, int32_t c)
{
    UNUSEDPARAM(ctx);
    if (!a && b < 0)
        return 0x7fffffff;
    return (int32_t)myround(c*pow(a,b));
}

uint32_t cli_bcapi_iexp(struct cli_bc_ctx *ctx, int32_t a, int32_t b, int32_t c)
{
    double f;
    UNUSEDPARAM(ctx);
    if (!b)
        return 0x7fffffff;
    f= c*exp((double)a/b);
    return (uint32_t)myround(f);
}

int32_t cli_bcapi_isin(struct cli_bc_ctx *ctx, int32_t a, int32_t b, int32_t c)
{
    double f;
    UNUSEDPARAM(ctx);
    if (!b)
        return 0x7fffffff;
    f = c*sin((double)a/b);
    return (int32_t)myround(f);
}

int32_t cli_bcapi_icos(struct cli_bc_ctx *ctx, int32_t a, int32_t b, int32_t c)
{
    double f;
    UNUSEDPARAM(ctx);
    if (!b)
        return 0x7fffffff;
    f = c*cos((double)a/b);
    return (int32_t)myround(f);
}

int32_t cli_bcapi_memstr(struct cli_bc_ctx *ctx, const uint8_t* h, int32_t hs,
                         const uint8_t*n, int32_t ns)
{
    const uint8_t *s;
    if (!h || !n || hs < 0 || ns < 0) {
        API_MISUSE();
        return -1;
    }
    cli_event_fastdata(EV, BCEV_MEM_1, h, hs);
    cli_event_fastdata(EV, BCEV_MEM_2, n, ns);
    s = (const uint8_t*) cli_memstr((const char*)h, hs, (const char*)n, ns);
    if (!s)
        return -1;
    return s - h;
}

int32_t cli_bcapi_hex2ui(struct cli_bc_ctx *ctx, uint32_t ah, uint32_t bh)
{
    char result = 0;
    unsigned char in[2];
    UNUSEDPARAM(ctx);

    in[0] = ah;
    in[1] = bh;

    if (cli_hex2str_to((const char*)in, &result, 2) == -1)
        return -1;
    return result;
}

int32_t cli_bcapi_atoi(struct cli_bc_ctx *ctx, const uint8_t* str, int32_t len)
{
    int32_t number = 0;
    const uint8_t *end = str + len;
    UNUSEDPARAM(ctx);

    while (isspace(*str) && str < end) str++;
    if (str == end)
        return -1;/* all spaces */
    if (*str == '+') str++;
    if (str == end)
        return -1;/* all spaces and +*/
    if (*str == '-')
        return -1;/* only positive numbers */
    if (!isdigit(*str))
        return -1;
    while (isdigit(*str) && str < end) {
        number = number*10 + (*str - '0');
    }
    return number;
}

uint32_t cli_bcapi_debug_print_str_start(struct cli_bc_ctx *ctx , const uint8_t* s, uint32_t len)
{
    UNUSEDPARAM(ctx);

    if (!s || len <= 0)
        return -1;
    cli_event_fastdata(EV, BCEV_DBG_STR, s, len);
    cli_dbgmsg("bytecode debug: %.*s", len, s);
    return 0;
}

uint32_t cli_bcapi_debug_print_str_nonl(struct cli_bc_ctx *ctx , const uint8_t* s, uint32_t len)
{
    UNUSEDPARAM(ctx);

    if (!s || len <= 0)
        return -1;
    if (!cli_debug_flag)
        return 0;
    return fwrite(s, 1, len, stderr);
}

uint32_t cli_bcapi_entropy_buffer(struct cli_bc_ctx *ctx , uint8_t* s, int32_t len)
{
    uint32_t probTable[256];
    unsigned int i;
    double entropy = 0;
    double log2 = log(2);

    UNUSEDPARAM(ctx);

    if (!s || len <= 0)
        return -1;
    memset(probTable, 0, sizeof(probTable));
    for (i=0;i<(unsigned int)len;i++) {
        probTable[s[i]]++;
    }
    for (i=0;i<256;i++) {
        double p;
        if (!probTable[i])
            continue;
        p = (double)probTable[i] / len;
        entropy += -p*log(p)/log2;
    }
    entropy *= 1<<26;
    return (uint32_t)entropy;
}

int32_t cli_bcapi_map_new(struct cli_bc_ctx *ctx, int32_t keysize, int32_t valuesize)
{
    unsigned n = ctx->nmaps+1;
    struct cli_map *s;
    if (!keysize)
        return -1;
    s = cli_realloc(ctx->maps, sizeof(*ctx->maps)*n);
    if (!s)
        return -1;
    ctx->maps = s;
    ctx->nmaps = n;
    s = &s[n-1];
    cli_map_init(s, keysize, valuesize, 16);
    return n-1;
}

static struct cli_map *get_hashtab(struct cli_bc_ctx *ctx, int32_t id)
{
    if (id < 0 || (unsigned int)id >= ctx->nmaps || !ctx->maps)
        return NULL;
    return &ctx->maps[id];
}

int32_t cli_bcapi_map_addkey(struct cli_bc_ctx *ctx , const uint8_t* key, int32_t keysize, int32_t id)
{
    struct cli_map *s = get_hashtab(ctx, id);
    if (!s)
        return -1;
    return cli_map_addkey(s, key, keysize);
}

int32_t cli_bcapi_map_setvalue(struct cli_bc_ctx *ctx, const uint8_t* value, int32_t valuesize, int32_t id)
{
    struct cli_map *s = get_hashtab(ctx, id);
    if (!s)
        return -1;
    return cli_map_setvalue(s, value, valuesize);
}

int32_t cli_bcapi_map_remove(struct cli_bc_ctx *ctx , const uint8_t* key, int32_t keysize, int32_t id)
{
    struct cli_map *s = get_hashtab(ctx, id);
    if (!s)
        return -1;
    return cli_map_removekey(s, key, keysize);
}

int32_t cli_bcapi_map_find(struct cli_bc_ctx *ctx , const uint8_t* key, int32_t keysize, int32_t id)
{
    struct cli_map *s = get_hashtab(ctx, id);
    if (!s)
        return -1;
    return cli_map_find(s, key, keysize);
}

int32_t cli_bcapi_map_getvaluesize(struct cli_bc_ctx *ctx, int32_t id)
{
    struct cli_map *s = get_hashtab(ctx, id);
    if (!s)
        return -1;
    return cli_map_getvalue_size(s);
}

uint8_t* cli_bcapi_map_getvalue(struct cli_bc_ctx *ctx , int32_t id, int32_t valuesize)
{
    struct cli_map *s = get_hashtab(ctx, id);
    if (!s)
        return NULL;
    if (cli_map_getvalue_size(s) != valuesize)
        return NULL;
    return cli_map_getvalue(s);
}

int32_t cli_bcapi_map_done(struct cli_bc_ctx *ctx , int32_t id)
{
    struct cli_map *s = get_hashtab(ctx, id);
    if (!s)
        return -1;
    cli_map_delete(s);
    if ((unsigned int)id == ctx->nmaps-1) {
        ctx->nmaps--;
        if (!ctx->nmaps) {
            free(ctx->maps);
            ctx->maps = NULL;
        } else {
            s = cli_realloc(ctx->maps, ctx->nmaps*(sizeof(*s)));
            if (s)
                ctx->maps = s;
        }
    }
    return 0;
}

uint32_t cli_bcapi_engine_functionality_level(struct cli_bc_ctx *ctx)
{
    UNUSEDPARAM(ctx);
    return cl_retflevel();
}

uint32_t cli_bcapi_engine_dconf_level(struct cli_bc_ctx *ctx)
{
    UNUSEDPARAM(ctx);
    return CL_FLEVEL_DCONF;
}

uint32_t cli_bcapi_engine_scan_options(struct cli_bc_ctx *ctx)
{
    cli_ctx *cctx = (cli_ctx*)ctx->ctx;
    return cctx->options;
}

uint32_t cli_bcapi_engine_db_options(struct cli_bc_ctx *ctx)
{
    cli_ctx *cctx = (cli_ctx*)ctx->ctx;
    return cctx->engine->dboptions;
}

int32_t cli_bcapi_extract_set_container(struct cli_bc_ctx *ctx, uint32_t ftype)
{
    if (ftype > CL_TYPE_IGNORED)
        return -1;
    ctx->containertype = ftype;
    return 0;
}

int32_t cli_bcapi_input_switch(struct cli_bc_ctx *ctx , int32_t extracted_file)
{
    fmap_t *map;
    if (ctx->extracted_file_input == (unsigned int)extracted_file)
        return 0;
    if (!extracted_file) {
        cli_dbgmsg("bytecode api: input switched back to main file\n");
        ctx->fmap = ctx->save_map;
        ctx->extracted_file_input = 0;
        return 0;
    }
    if (ctx->outfd < 0)
        return -1;
    map = fmap(ctx->outfd, 0, 0);
    if (!map) {
        cli_warnmsg("can't mmap() extracted temporary file %s\n", ctx->tempfile);
        return -1;
    }
    ctx->save_map = ctx->fmap;
    cli_bytecode_context_setfile(ctx, map);
    ctx->extracted_file_input = 1;
    cli_dbgmsg("bytecode api: input switched to extracted file\n");
    return 0;
}

uint32_t cli_bcapi_get_environment(struct cli_bc_ctx *ctx , struct cli_environment* env, uint32_t len)
{
    if (len > sizeof(*env)) {
        cli_dbgmsg("cli_bcapi_get_environment len %u > %lu\n", len, (unsigned long)sizeof(*env));
        return -1;
    }
    memcpy(env, ctx->env, len);
    return 0;
}

uint32_t cli_bcapi_disable_bytecode_if(struct cli_bc_ctx *ctx , const int8_t* reason, uint32_t len, uint32_t cond)
{
    UNUSEDPARAM(len);
    if (ctx->bc->kind != BC_STARTUP) {
        cli_dbgmsg("Bytecode must be BC_STARTUP to call disable_bytecode_if\n");
        return -1;
    }
    if (!cond)
        return ctx->bytecode_disable_status;
    if (*reason == '^')
        cli_warnmsg("Bytecode: disabling completely because %s\n", reason+1);
    else
        cli_dbgmsg("Bytecode: disabling completely because %s\n", reason);
    ctx->bytecode_disable_status = 2;
    return ctx->bytecode_disable_status;
}

uint32_t cli_bcapi_disable_jit_if(struct cli_bc_ctx *ctx , const int8_t* reason, uint32_t len, uint32_t cond)
{
    UNUSEDPARAM(len);
    if (ctx->bc->kind != BC_STARTUP) {
        cli_dbgmsg("Bytecode must be BC_STARTUP to call disable_jit_if\n");
        return -1;
    }
    if (!cond)
        return ctx->bytecode_disable_status;
    if (*reason == '^')
        cli_warnmsg("Bytecode: disabling JIT because %s\n", reason+1);
    else
        cli_dbgmsg("Bytecode: disabling JIT because %s\n", reason);
    if (ctx->bytecode_disable_status != 2) /* no reenabling */
        ctx->bytecode_disable_status = 1;
    return ctx->bytecode_disable_status;
}

int32_t cli_bcapi_version_compare(struct cli_bc_ctx *ctx , const uint8_t* lhs, uint32_t lhs_len, 
                                  const uint8_t* rhs, uint32_t rhs_len)
{
    unsigned i = 0, j = 0;
    unsigned long li=0, ri=0;
    UNUSEDPARAM(ctx);
    do {
        while (i < lhs_len && j < rhs_len && lhs[i] == rhs[j] &&
               !isdigit(lhs[i]) && !isdigit(rhs[j])) {
            i++; j++;
        }
        if (i == lhs_len && j == rhs_len)
            return 0;
        if (i == lhs_len)
            return -1;
        if (j == rhs_len)
            return 1;
        if (!isdigit(lhs[i]) || !isdigit(rhs[j]))
            return lhs[i] < rhs[j] ? -1 : 1;
        while (isdigit(lhs[i]) && i < lhs_len)
            li = 10*li + (lhs[i++] - '0');
        while (isdigit(rhs[j]) && j < rhs_len)
            ri = 10*ri + (rhs[j++] - '0');
        if (li < ri)
            return -1;
        if (li > ri)
            return 1;
    } while (1);
}

static int check_bits(uint32_t query, uint32_t value, uint8_t shift, uint8_t mask)
{
    uint8_t q = (query >> shift)&mask;
    uint8_t v = (value >> shift)&mask;
    /* q == mask -> ANY */
    if (q == v || q == mask)
        return 1;
    return 0;
}

uint32_t cli_bcapi_check_platform(struct cli_bc_ctx *ctx , uint32_t a, uint32_t b , uint32_t c)
{
    unsigned ret =
        check_bits(a, ctx->env->platform_id_a, 24, 0xff) &&
        check_bits(a, ctx->env->platform_id_a, 20, 0xf) &&
        check_bits(a, ctx->env->platform_id_a, 16, 0xf) &&
        check_bits(a, ctx->env->platform_id_a, 8, 0xff) &&
        check_bits(a, ctx->env->platform_id_a, 0, 0xff) &&
        check_bits(b, ctx->env->platform_id_b, 28, 0xf) &&
        check_bits(b, ctx->env->platform_id_b, 24, 0xf) &&
        check_bits(b, ctx->env->platform_id_b, 16, 0xff) &&
        check_bits(b, ctx->env->platform_id_b, 8, 0xff) &&
        check_bits(b, ctx->env->platform_id_b, 0, 0xff) &&
        check_bits(c, ctx->env->platform_id_c, 24, 0xff) &&
        check_bits(c, ctx->env->platform_id_c, 16, 0xff) &&
        check_bits(c, ctx->env->platform_id_c, 8, 0xff) &&
        check_bits(c, ctx->env->platform_id_c, 0, 0xff);
    if (ret) {
        cli_dbgmsg("check_platform(0x%08x,0x%08x,0x%08x) = match\n",a,b,c);
    }
    return ret;
}

int cli_bytecode_context_setpdf(struct cli_bc_ctx *ctx, unsigned phase,
                                unsigned nobjs,
                                struct pdf_obj *objs, uint32_t *pdf_flags,
                                uint32_t pdfsize, uint32_t pdfstartoff)
{
    ctx->pdf_nobjs = nobjs;
    ctx->pdf_objs = objs;
    ctx->pdf_flags = pdf_flags;
    ctx->pdf_size = pdfsize;
    ctx->pdf_startoff = pdfstartoff;
    ctx->pdf_phase = phase;
    return 0;
}

int32_t cli_bcapi_pdf_get_obj_num(struct cli_bc_ctx *ctx)
{
    if (!ctx->pdf_phase)
        return -1;
    return ctx->pdf_nobjs;
}

int32_t cli_bcapi_pdf_get_flags(struct cli_bc_ctx *ctx)
{
    if (!ctx->pdf_phase)
        return -1;
    return *ctx->pdf_flags;
}

int32_t cli_bcapi_pdf_set_flags(struct cli_bc_ctx *ctx , int32_t flags)
{
    if (!ctx->pdf_phase)
        return -1;
    cli_dbgmsg("cli_pdf: bytecode set_flags %08x -> %08x\n",
               *ctx->pdf_flags,
               flags);
    *ctx->pdf_flags = flags;
    return 0;
}

int32_t cli_bcapi_pdf_lookupobj(struct cli_bc_ctx *ctx , uint32_t objid)
{
    unsigned i;
    if (!ctx->pdf_phase)
        return -1;
    for (i=0;i<ctx->pdf_nobjs;i++) {
        if (ctx->pdf_objs[i].id == objid)
            return i;
    }
    return -1;
}

uint32_t cli_bcapi_pdf_getobjsize(struct cli_bc_ctx *ctx , int32_t objidx)
{
    if (!ctx->pdf_phase ||
        (uint32_t)objidx >= ctx->pdf_nobjs ||
        ctx->pdf_phase == PDF_PHASE_POSTDUMP /* map is obj itself, no access to pdf anymore */
       )
        return 0;
    if ((uint32_t)(objidx + 1) == ctx->pdf_nobjs)
        return ctx->pdf_size - ctx->pdf_objs[objidx].start;
    return ctx->pdf_objs[objidx+1].start - ctx->pdf_objs[objidx].start - 4;
}

const uint8_t* cli_bcapi_pdf_getobj(struct cli_bc_ctx *ctx , int32_t objidx, uint32_t amount)
{
    uint32_t size = cli_bcapi_pdf_getobjsize(ctx, objidx);
    if (amount > size)
        return NULL;
    return fmap_need_off(ctx->fmap, ctx->pdf_objs[objidx].start, amount);
}

int32_t cli_bcapi_pdf_getobjid(struct cli_bc_ctx *ctx , int32_t objidx)
{
    if (!ctx->pdf_phase ||
        (uint32_t)objidx >= ctx->pdf_nobjs)
        return -1;
    return ctx->pdf_objs[objidx].id;
}

int32_t cli_bcapi_pdf_getobjflags(struct cli_bc_ctx *ctx , int32_t objidx)
{
    if (!ctx->pdf_phase ||
        (uint32_t)objidx >= ctx->pdf_nobjs)
        return -1;
    return ctx->pdf_objs[objidx].flags;
}

int32_t cli_bcapi_pdf_setobjflags(struct cli_bc_ctx *ctx , int32_t objidx, int32_t flags)
{
    if (!ctx->pdf_phase ||
        (uint32_t)objidx >= ctx->pdf_nobjs)
        return -1;
    cli_dbgmsg("cli_pdf: bytecode setobjflags %08x -> %08x\n",
               ctx->pdf_objs[objidx].flags,
               flags);
    ctx->pdf_objs[objidx].flags = flags;
    return 0;
}

int32_t cli_bcapi_pdf_get_offset(struct cli_bc_ctx *ctx , int32_t objidx)
{
    if (!ctx->pdf_phase ||
        (uint32_t)objidx >= ctx->pdf_nobjs)
        return -1;
    return ctx->pdf_startoff + ctx->pdf_objs[objidx].start;
}

int32_t cli_bcapi_pdf_get_phase(struct cli_bc_ctx *ctx)
{
    return ctx->pdf_phase;
}

int32_t cli_bcapi_pdf_get_dumpedobjid(struct cli_bc_ctx *ctx)
{
    if (ctx->pdf_phase != PDF_PHASE_POSTDUMP)
        return -1;
    return ctx->pdf_dumpedid;
}

int32_t cli_bcapi_running_on_jit(struct cli_bc_ctx *ctx )
{
    ctx->no_diff = 1;
    return ctx->on_jit;
}

int32_t cli_bcapi_get_file_reliability(struct cli_bc_ctx *ctx )
{
    cli_ctx *cctx = (cli_ctx*)ctx->ctx;
    return cctx ? cctx->corrupted_input : 3;
}

int32_t cli_bcapi_json_is_active(struct cli_bc_ctx *ctx )
{
#if HAVE_JSON
    cli_ctx *cctx = (cli_ctx*)ctx->ctx;
    if (cctx->properties != NULL) {
        return 1;
    }
#else
    UNUSEDPARAM(ctx);
    cli_dbgmsg("bytecode api: libjson is not enabled!\n");
#endif
    return 0;
}

static int32_t cli_bcapi_json_objs_init(struct cli_bc_ctx *ctx) {
#if HAVE_JSON 
    unsigned n = ctx->njsonobjs + 1;
    json_object **j, **jobjs = (json_object **)(ctx->jsonobjs);
    cli_ctx *cctx = (cli_ctx *)ctx->ctx;

    j = cli_realloc(jobjs, sizeof(json_object *)*n);
    if (!j) { /* memory allocation failure */
        cli_event_error_oom(EV, 0);
        return -1;
    }
    ctx->jsonobjs = (void **)j;
    ctx->njsonobjs = n;
    j[n-1] = cctx->properties;    

    return 0;
#else
    UNUSEDPARAM(ctx);
    return -1;
#endif
}

#define INIT_JSON_OBJS(ctx)                                             \
    if (!cli_bcapi_json_is_active(ctx))                                 \
        return -1;                                                      \
    if (ctx->njsonobjs == 0) {                                          \
        if (cli_bcapi_json_objs_init(ctx)) {                            \
            return -1;                                                  \
        }                                                               \
    }                                                                   \

int32_t cli_bcapi_json_get_object(struct cli_bc_ctx *ctx, const int8_t* name, int32_t name_len, int32_t objid)
{
#if HAVE_JSON
    unsigned n;
    json_object **j, *jobj, **jobjs;
    char *namep;

    INIT_JSON_OBJS(ctx);
    jobjs = ((json_object **)(ctx->jsonobjs));
    if (objid < 0 || (unsigned int)objid >= ctx->njsonobjs) {
        cli_dbgmsg("bytecode api[json_get_object]: invalid json objid requested\n");
        return -1;
    }

    if (!name || name_len < 0) {
        cli_dbgmsg("bytecode api[json_get_object]: unnamed object queried\n");
        return -1;
    }

    n = ctx->njsonobjs + 1;
    jobj = jobjs[objid];
    if (!jobj) /* shouldn't be possible */
        return -1;
    namep = (char*)cli_malloc(sizeof(char)*(name_len+1));
    if (!namep)
        return -1;
    strncpy(namep, (char*)name, name_len);
    namep[name_len] = '\0';

    if (!json_object_object_get_ex(jobj, namep, &jobj)) { /* object not found */
        free(namep);
        return 0;
    }

    j = cli_realloc(jobjs, sizeof(json_object *)*n);
    if (!j) { /* memory allocation failure */
        free(namep);
        cli_event_error_oom(EV, 0);
        return -1;
    }
    ctx->jsonobjs = (void **)j;
    ctx->njsonobjs = n;
    j[n-1] = jobj;

    cli_dbgmsg("bytecode api[json_get_object]: assigned %s => ID %d\n", namep, n-1);
    free(namep);
    return n-1;
#else
    UNUSEDPARAM(ctx);
    UNUSEDPARAM(name);
    UNUSEDPARAM(name_len);
    UNUSEDPARAM(objid);
    cli_dbgmsg("bytecode api: libjson is not enabled!\n");
    return -1;
#endif
}

int32_t cli_bcapi_json_get_type(struct cli_bc_ctx *ctx, int32_t objid)
{
#if HAVE_JSON
    enum json_type type;
    json_object **jobjs;

    INIT_JSON_OBJS(ctx);
    jobjs = ((json_object **)(ctx->jsonobjs));
    if (objid < 0 || (unsigned int)objid >= ctx->njsonobjs) {
        cli_dbgmsg("bytecode api[json_get_type]: invalid json objid requested\n");
        return -1;
    }

    type = json_object_get_type(jobjs[objid]);
    switch (type) {
    case json_type_null:
        return JSON_TYPE_NULL;
    case json_type_boolean:
        return JSON_TYPE_BOOLEAN;
    case json_type_double:
        return JSON_TYPE_DOUBLE;
    case json_type_int:
        return JSON_TYPE_INT;
    case json_type_object:
        return JSON_TYPE_OBJECT;
    case json_type_array:
        return JSON_TYPE_ARRAY;
    case json_type_string:
        return JSON_TYPE_STRING;
    default:
        cli_dbgmsg("bytecode api[json_get_type]: unrecognized json type %d\n", type);
    }
    
#else
    UNUSEDPARAM(ctx);
    UNUSEDPARAM(objid);
    cli_dbgmsg("bytecode api: libjson is not enabled!\n");
#endif
    return -1;
}

int32_t cli_bcapi_json_get_array_length(struct cli_bc_ctx *ctx, int32_t objid)
{
#if HAVE_JSON
    enum json_type type;
    json_object **jobjs;

    INIT_JSON_OBJS(ctx);
    jobjs = (json_object **)(ctx->jsonobjs);
    if (objid < 0 || (unsigned int)objid >= ctx->njsonobjs) {
        cli_dbgmsg("bytecode api[json_array_get_length]: invalid json objid requested\n");
        return -1;
    }

    type = json_object_get_type(jobjs[objid]);
    if (type != json_type_array) {
        return -2; /* error code for not an array */
    }

    return json_object_array_length(jobjs[objid]);
#else
    UNUSEDPARAM(ctx);
    UNUSEDPARAM(objid);
    cli_dbgmsg("bytecode api: libjson is not enabled!\n");
    return -1;
#endif
}

int32_t cli_bcapi_json_get_array_idx(struct cli_bc_ctx *ctx, int32_t idx, int32_t objid)
{
#if HAVE_JSON
    enum json_type type;
    unsigned n;
    int length;
    json_object **j, *jarr = NULL, *jobj = NULL, **jobjs;

    INIT_JSON_OBJS(ctx);
    jobjs = (json_object **)(ctx->jsonobjs);
    if (objid < 0 || (unsigned int)objid >= ctx->njsonobjs) {
        cli_dbgmsg("bytecode api[json_array_get_idx]: invalid json objid requested\n");
        return -1;
    }

    jarr = jobjs[objid];
    if (!jarr) /* shouldn't be possible */
        return -1;

    type = json_object_get_type(jarr);
    if (type != json_type_array) {
        return -2; /* error code for not an array */
    }

    length = json_object_array_length(jarr);
    if (idx >= 0 && idx < length) {
        n = ctx->njsonobjs + 1;

        jobj = json_object_array_get_idx(jarr,idx);
        if (!jobj) { /* object not found */
            return 0;
        }

        j = cli_realloc(jobjs, sizeof(json_object *)*n);
        if (!j) { /* memory allocation failure */
            cli_event_error_oom(EV, 0);
            return -1;
        }
        ctx->jsonobjs = (void **)j;
        ctx->njsonobjs = n;
        j[n-1] = jobj;

        cli_dbgmsg("bytecode api[json_array_get_idx]: assigned array @ %d => ID %d\n", idx, n-1);
        return n-1;
    }

    return 0;
#else
    UNUSEDPARAM(ctx);
    UNUSEDPARAM(idx);
    UNUSEDPARAM(objid);
    cli_dbgmsg("bytecode api: libjson is not enabled!\n");
    return -1;
#endif
}

int32_t cli_bcapi_json_get_string_length(struct cli_bc_ctx *ctx, int32_t objid)
{
#if HAVE_JSON
    enum json_type type;
    json_object *jobj, **jobjs;
    int32_t len;
    const char *jstr;

    INIT_JSON_OBJS(ctx);
    jobjs = (json_object **)(ctx->jsonobjs);
    if (objid < 0 || (unsigned int)objid >= ctx->njsonobjs) {
        cli_dbgmsg("bytecode api[json_get_string_length]: invalid json objid requested\n");
        return -1;
    }

    jobj = jobjs[objid];
    if (!jobj) /* shouldn't be possible */
        return -1;

    type = json_object_get_type(jobj);
    if (type != json_type_string) {
        return -2; /* error code for not an array */
    }

    //len = json_object_get_string_len(jobj); /* not in JSON <0.10 */
    jstr = json_object_get_string(jobj);
    len = strlen(jstr);

    return len;
#else
    UNUSEDPARAM(ctx);
    UNUSEDPARAM(objid);
    cli_dbgmsg("bytecode api: libjson is not enabled!\n");
    return -1;
#endif
}

int32_t cli_bcapi_json_get_string(struct cli_bc_ctx *ctx, int8_t* str, int32_t str_len, int32_t objid)
{
#if HAVE_JSON
    enum json_type type;
    json_object *jobj, **jobjs;
    int32_t len;
    const char *jstr;

    INIT_JSON_OBJS(ctx);
    jobjs = (json_object **)(ctx->jsonobjs);
    if (objid < 0 || (unsigned int)objid >= ctx->njsonobjs) {
        cli_dbgmsg("bytecode api[json_get_string]: invalid json objid requested\n");
        return -1;
    }

    jobj = jobjs[objid];
    if (!jobj) /* shouldn't be possible */
        return -1;

    type = json_object_get_type(jobj);
    if (type != json_type_string) {
        return -2; /* error code for not an array */
    }

    //len = json_object_get_string_len(jobj); /* not in JSON <0.10 */
    jstr = json_object_get_string(jobj);
    len = strlen(jstr);

    if (len+1 > str_len) {
        /* limit on str-len */
        strncpy((char *)str, jstr, str_len-1);
        str[str_len-1] = '\0';
        return str_len;
    }
    else {
        /* limit on len+1 */
        strncpy((char *)str, jstr, len);
        str[len] = '\0';
        return len+1;
    }
#else
    UNUSEDPARAM(ctx);
    UNUSEDPARAM(str);
    UNUSEDPARAM(str_len);
    UNUSEDPARAM(objid);
    cli_dbgmsg("bytecode api: libjson is not enabled!\n");
    return -1;
#endif
}

int32_t cli_bcapi_json_get_boolean(struct cli_bc_ctx *ctx, int32_t objid)
{
#if HAVE_JSON
    json_object *jobj, **jobjs;

    INIT_JSON_OBJS(ctx);
    jobjs = (json_object **)(ctx->jsonobjs);
    if (objid < 0 || (unsigned int)objid >= ctx->njsonobjs) {
        cli_dbgmsg("bytecode api[json_get_boolean]: invalid json objid requested\n");
        return -1;
    }

    jobj = jobjs[objid];
    return json_object_get_boolean(jobj);
#else
    UNUSEDPARAM(ctx);
    UNUSEDPARAM(objid);
    cli_dbgmsg("bytecode api: libjson is not enabled!\n");
    return 0;
#endif
}

int32_t cli_bcapi_json_get_int(struct cli_bc_ctx *ctx, int32_t objid)
{
#if HAVE_JSON
    json_object *jobj, **jobjs;

    INIT_JSON_OBJS(ctx);
    jobjs = (json_object **)(ctx->jsonobjs);
    if (objid < 0 || (unsigned int)objid >= ctx->njsonobjs) {
        cli_dbgmsg("bytecode api[json_get_int]: invalid json objid requested\n");
        return -1;
    }

    jobj = jobjs[objid];
    return json_object_get_int(jobj);
#else
    UNUSEDPARAM(ctx);
    UNUSEDPARAM(objid);
    cli_dbgmsg("bytecode api: libjson is not enabled!\n");
    return 0;
#endif
}

//int64_t cli_bcapi_json_get_int64(struct cli_bc_ctx *ctx, int32_t objid);
//double cli_bcapi_json_get_double(struct cli_bc_ctx *ctx, int32_t objid);