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Python_CodeGen.jrag

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  • Forked from Anders Blomdell / LabComm
    Source project has a limited visibility.
    labcomm_decoder.c 12.29 KiB
    /*
      labcomm_decoder.c -- runtime for handling decoding of labcomm samples.
    
      Copyright 2006-2013 Anders Blomdell <anders.blomdell@control.lth.se>
    
      This file is part of LabComm.
    
      LabComm is free software: you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation, either version 3 of the License, or
      (at your option) any later version.
    
      LabComm 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, see <http://www.gnu.org/licenses/>.
    */
    #define CURRENT_VERSION "LabComm20141009"
    
    #include <errno.h>
    #include "labcomm.h"
    #include "labcomm_private.h"
    #include "labcomm_ioctl.h"
    #include "labcomm_dynamic_buffer_writer.h"
    #include "labcomm_bytearray_reader.h"
    
    struct sample_entry {
      int remote_index;
      struct labcomm_signature *signature;
      labcomm_decoder_function decode;
      labcomm_handler_function handler;
      void *context;
    };
    
    struct labcomm_decoder {
      struct labcomm_reader *reader;
      int reader_allocated;
      int version_ok;
      struct labcomm_error_handler *error;
      struct labcomm_memory *memory;
      struct labcomm_scheduler *scheduler;
      labcomm_error_handler_callback on_error;
      labcomm_handle_new_datatype_callback on_new_datatype;
      LABCOMM_SIGNATURE_ARRAY_DEF(local, struct sample_entry);
      LABCOMM_SIGNATURE_ARRAY_DEF(remote_to_local, int);
    };
    
    struct labcomm_decoder *labcomm_decoder_new(
      struct labcomm_reader *reader,
      struct labcomm_error_handler *error,
      struct labcomm_memory *memory,
      struct labcomm_scheduler *scheduler)
    {
      struct labcomm_decoder *result;
    
      result = labcomm_memory_alloc(memory, 0, sizeof(*result));
      if (result) {
        result->reader = reader;
        result->reader->decoder = result;
        result->reader->data = 0;
        result->reader->data_size = 0;
        result->reader->count = 0;
        result->reader->pos = 0;
        result->reader->error = 0;
        result->reader_allocated = 0;
        result->version_ok = 0;
        result->error = error;
        result->memory = memory;
        result->scheduler = scheduler;
        result->on_error = on_error_fprintf;
        LABCOMM_SIGNATURE_ARRAY_INIT(result->local, struct sample_entry);
        LABCOMM_SIGNATURE_ARRAY_INIT(result->remote_to_local, int);
      }
      return result;
    }
    #ifndef WITHOUT_PRAGMA
    /* Internal aux function to allow temporary internal decoders
     * to share the same memory.
     * This function only frees the decoder, not the memory
     */
    static void internal_labcomm_decoder_free(struct labcomm_decoder* d)
    {
      struct labcomm_memory *memory = d->memory;
      labcomm_reader_free(d->reader, d->reader->action_context);
      LABCOMM_SIGNATURE_ARRAY_FREE(memory, d->local, struct sample_entry);
      LABCOMM_SIGNATURE_ARRAY_FREE(memory, d->remote_to_local, int);
    }
    
    void labcomm_decoder_free(struct labcomm_decoder* d)
    {
      struct labcomm_memory *memory = d->memory;
      internal_labcomm_decoder_free(d);
      labcomm_memory_free(memory, 0, d);
    }
    
    #else
    void labcomm_decoder_free(struct labcomm_decoder* d)
    {
      struct labcomm_memory *memory = d->memory;
    
      labcomm_reader_free(d->reader, d->reader->action_context);
      LABCOMM_SIGNATURE_ARRAY_FREE(memory, d->local, struct sample_entry);
      LABCOMM_SIGNATURE_ARRAY_FREE(memory, d->remote_to_local, int);
      labcomm_memory_free(memory, 0, d);
    }
    #endif
    
    static int decode_sample_def(struct labcomm_decoder *d, int kind)
    {
      int result;
      struct labcomm_signature signature, *local_signature;
      int remote_index, local_index, i;
      
      local_signature = NULL;
      local_index = 0;
      remote_index = labcomm_read_packed32(d->reader);
      if (d->reader->error < 0) {
        result = d->reader->error;
        goto out;
      }
      signature.name = labcomm_read_string(d->reader);
      if (d->reader->error < 0) {
        result = d->reader->error;
        goto out;
      }
      signature.size = labcomm_read_packed32(d->reader);
      if (d->reader->error < 0) {
        result = d->reader->error;
        goto free_signature_name;
      }
      signature.signature = labcomm_memory_alloc(d->memory, 1,  signature.size);
      if (d->reader->error < 0) {
        result = d->reader->error;
        goto free_signature_name;
      }
      for (i = 0 ; i < signature.size ; i++) {
        signature.signature[i] = labcomm_read_byte(d->reader);
        if (d->reader->error < 0) {
          result = d->reader->error;
          goto free_signature_signature;
        }
      }
      labcomm_scheduler_data_lock(d->scheduler);
      LABCOMM_SIGNATURE_ARRAY_FOREACH(d->local, struct sample_entry, i) {
        struct sample_entry *s;
        int *remote_to_local;
          
        result = -ENOENT;
        s = LABCOMM_SIGNATURE_ARRAY_REF(d->memory, 
    				      d->local,  struct sample_entry, i);
        if (s->signature &&
            s->signature->size == signature.size &&
            strcmp(s->signature->name, signature.name) == 0 &&
            memcmp((void*)s->signature->signature, (void*)signature.signature,
    	       signature.size) == 0) {
          s->remote_index = remote_index;
          local_signature = s->signature;
          local_index = i;
          remote_to_local = LABCOMM_SIGNATURE_ARRAY_REF(d->memory,
                                                        d->remote_to_local, int,
                                                        remote_index);
          *remote_to_local = i;
          result = remote_index;
          break;
        }
      }
      labcomm_scheduler_data_unlock(d->scheduler);
      if (local_signature) {
        labcomm_reader_start(d->reader, d->reader->action_context,
                             local_index, remote_index, local_signature,
                             NULL);
        labcomm_reader_end(d->reader, d->reader->action_context);
      }
    free_signature_signature:
      labcomm_memory_free(d->memory, 1,  signature.signature);
    free_signature_name:
      labcomm_memory_free(d->memory, 0, signature.name);
    out:
      return result;
    }
    
    struct call_handler_context {
      struct labcomm_reader *reader;
      int local_index;
      int remote_index;
      struct labcomm_signature *signature;
      labcomm_handler_function handler;
      void *context;
    };
    
    static void call_handler(void *value, void *context)
    {
      struct call_handler_context *wrap = context;
    
      if (wrap->reader->error >= 0) {
        labcomm_reader_start(wrap->reader, wrap->reader->action_context,
    			 wrap->local_index, wrap->remote_index, wrap->signature,
    			 value);
        wrap->handler(value, wrap->context);
        labcomm_reader_end(wrap->reader, wrap->reader->action_context);
      }
    }
    
    static void reader_alloc(struct labcomm_decoder *d)
    {
      if (!d->reader_allocated) {
        d->reader_allocated = 1;
        labcomm_reader_alloc(d->reader, d->reader->action_context);
      }
    }
    static int decode_version(struct labcomm_decoder *d, int remote_index)
    {
        int result;
        char *version = labcomm_read_string(d->reader);
        if (d->reader->error < 0) {
          result = d->reader->error;
          goto out;
        }
        if (strcmp(version, CURRENT_VERSION) == 0) {
          result = LABCOMM_VERSION;
          d->version_ok = 1;
        } else {
          result = -ECONNRESET;
        }  
        labcomm_memory_free(d->memory, 1,  version);
    out:   
      return result;
    }
    
    static int decoder_skip(struct labcomm_decoder *d, int len)
    {
      int i;
      for(i = 0; i <len; i++){
        labcomm_read_byte(d->reader);
        if (d->reader->error < 0) {
          return d->reader->error;
        }
      }
      return 0;
    }
    static int decode_pragma(struct labcomm_decoder *d, int len)
    {
      char *pragma_type;
      int result;
      pragma_type = labcomm_read_string(d->reader);
      if (d->reader->error < 0) {
        result = d->reader->error;
        goto out;
      }
      int bytes = labcomm_size_string(pragma_type);
      int psize = len-bytes;
      if(0 /*d->pragma_handler*/) {
      //read the entire packet to a buffer and then run
      // decode on that through a bytearray_reader.
      // (to easily handle multiple labcomm packets in one metadata packet)
        int i;
        unsigned char pragma_data[psize] ;
        for(i=0; i<psize; i++) {
           pragma_data[i] = labcomm_read_byte(d->reader);
           if (d->reader->error < 0) {
             result = d->reader->error;
             goto out;
           }
         }
         struct labcomm_reader *pr = labcomm_bytearray_reader_new(
                                         d->reader->memory, pragma_data, psize);
         struct labcomm_decoder *pd = labcomm_decoder_new(
                                         pr, d->error, d->memory, d->scheduler);
        /* d->prama_handler(pd, ptype, plen); */
    
         internal_labcomm_decoder_free(pd);
         result = 0;
       } else {
         result = decoder_skip(d, psize);
       }
    out:
      return result;
    }
    
    int labcomm_decoder_decode_one(struct labcomm_decoder *d)
    {
      int result, remote_index, length;
    
      reader_alloc(d);
      remote_index = labcomm_read_packed32(d->reader);
      if (d->reader->error < 0) {
        result = d->reader->error;
        goto out;
      }
      length = labcomm_read_packed32(d->reader);
      if (d->reader->error < 0) {
        result = d->reader->error;
        goto out;
      }
      if (remote_index == LABCOMM_VERSION) {
        result = decode_version(d, remote_index);
      } else if (! d->version_ok) {
        fprintf(stderr, "No VERSION %d %d\n", remote_index, length);
        result = -ECONNRESET;
      } else if (remote_index == LABCOMM_SAMPLE_DEF) {
        result = decode_sample_def(d, remote_index); 
      } else if (remote_index == LABCOMM_PRAGMA ){
        result = decode_pragma(d, length);
      } else if (remote_index < LABCOMM_USER) {
        fprintf(stderr, "SKIP %d %d\n", remote_index, length);
        result = remote_index;
      } else {
        int *local_index;
        struct call_handler_context wrap = {
          .reader = d->reader,
          .remote_index = remote_index,
          .signature = NULL,
          .handler = NULL,
          .context = NULL,
        };
        labcomm_decoder_function do_decode = NULL;
    
        labcomm_scheduler_data_lock(d->scheduler);
        local_index = LABCOMM_SIGNATURE_ARRAY_REF(d->memory,
    					      d->remote_to_local, int,
    					      remote_index);
        if (*local_index != 0) {
          struct sample_entry *entry;
    
          entry = LABCOMM_SIGNATURE_ARRAY_REF(d->memory,
    					  d->local, struct sample_entry,
    					  *local_index);
          wrap.local_index = *local_index;
          wrap.signature = entry->signature;
          wrap.handler = entry->handler;
          wrap.context = entry->context;
          do_decode = entry->decode;
          result = *local_index;
        }
        labcomm_scheduler_data_unlock(d->scheduler);
        if (do_decode) {
          do_decode(d->reader, call_handler, &wrap);
          if (d->reader->error < 0) {
    	result = d->reader->error;
          }
        } else {
          result = -ENOENT;
        }
      }
    out:   
      return result;
    }
    
    void labcomm_decoder_run(struct labcomm_decoder *d)
    {
      while (labcomm_decoder_decode_one(d) > 0) {
      }
    }
    
    int labcomm_decoder_ioctl(struct labcomm_decoder *d, 
    			  uint32_t action,
    			  ...)
    {
      int result;  
      va_list va;
        
      va_start(va, action);
      result = labcomm_reader_ioctl(d->reader, 
    				d->reader->action_context,
    				0, 0, NULL, action, va);
      va_end(va);
      return result;
    }
    
    int labcomm_internal_decoder_ioctl(struct labcomm_decoder *d, 
    				   struct labcomm_signature *signature,
    				   uint32_t action, va_list va)
    {
      int result;
      int local_index, remote_index;
    
      local_index = labcomm_get_local_index(signature);
      labcomm_scheduler_data_lock(d->scheduler);
      remote_index = LABCOMM_SIGNATURE_ARRAY_REF(d->memory,
    					     d->local,
    					     struct sample_entry,
    					     local_index)->remote_index;
      labcomm_scheduler_data_unlock(d->scheduler);
      result = labcomm_reader_ioctl(d->reader, d->reader->action_context,
    				local_index, remote_index, 
    				signature, action, va);
      return result;
    }
    
    int labcomm_internal_decoder_register(
      struct labcomm_decoder *d,
      struct labcomm_signature *signature,
      labcomm_decoder_function decode, 
      labcomm_handler_function handler,
      void *context)
    {
      int local_index;
      struct sample_entry *entry;
     
      reader_alloc(d);
      local_index = labcomm_get_local_index(signature);
      if (local_index <= 0) { goto out; }
      labcomm_reader_start(d->reader, d->reader->action_context,
    		       local_index, 0, signature,
    		       NULL);
      labcomm_reader_end(d->reader, d->reader->action_context);
    
      labcomm_scheduler_data_lock(d->scheduler);
      entry = LABCOMM_SIGNATURE_ARRAY_REF(d->memory,
    				      d->local, struct sample_entry,
    				      local_index);
      if (entry == NULL) { local_index = -ENOMEM; goto unlock; }
      entry->remote_index = 0;
      entry->signature = signature;
      entry->decode = decode;
      entry->handler = handler;
      entry->context = context;
    unlock:
      labcomm_scheduler_data_unlock(d->scheduler);
    out:
      return local_index;
    }