/**

  * $Id$

  *

  * Miscellaneous utility functions.

  *

  * Copyright (c) 2005 Nathan Keynes.

  *

  * This program 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 2 of the License, or

  * (at your option) any later version.

  *

  * 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.

  */

 #define HAVE_EXECINFO_H 1

 #include <assert.h>

 #include <ctype.h>

 #include <stdarg.h>

 #include <stdio.h>

 #include <stdlib.h>

 #include <signal.h>

 #include <time.h>

 #include <zlib.h>

 #include <glib.h>

 #include <png.h>

 #include "dream.h"

 #include "display.h"

 #include "dreamcast.h"

 #include "gui.h"

 #include "sh4/sh4.h"

 char *msg_levels[] = { "FATAL", "ERROR", "WARN", "INFO", "DEBUG", "TRACE" };

 int global_msg_level = EMIT_WARN;

 static void report_crash( int signo, siginfo_t *info, void *ptr )

 {

     char buf[128];

     fprintf( stderr, "--- Aborting with signal %d ---\n", signo );

     // Get gdb to print a nice backtrace for us

     snprintf( buf, 128, "gdb -batch -f --quiet --pid=%d -ex bt", getpid() );

     system(buf);

     abort();

 }

 void install_crash_handler(void)

 {

     struct sigaction sa;

     sa.sa_sigaction = report_crash;

     sigemptyset(&sa.sa_mask);

     sa.sa_flags = SA_RESETHAND|SA_SIGINFO;

     sigaction( SIGSEGV, &sa, NULL );

 }

 void fwrite_string( const char *s, FILE *f )

 {

     uint32_t len = 0;

     if( s == NULL ) {

         fwrite( &len, sizeof(len), 1, f );

     } else {

         len = strlen(s)+1;

         fwrite( &len, sizeof(len), 1, f );

         fwrite( s, len, 1, f );

     }

 }

 int fread_string( char *s, int maxlen, FILE *f ) 

 {

     uint32_t len;

     fread( &len, sizeof(len), 1, f );

     if( len != 0 ) {

         fread( s, len > maxlen ? maxlen : len, 1, f );

     }

     return len;

 }

 int fwrite_gzip( void *p, size_t sz, size_t count, FILE *f )

 {

     uLongf size = sz*count;

     uLongf csize = ((int)(size*1.001))+13;

     unsigned char *tmp = g_malloc0( csize );

     int status = compress( tmp, &csize, p, size );

     assert( status == Z_OK );

     uint32_t wsize = (uint32_t)csize;

     fwrite( &wsize, sizeof(wsize), 1, f );

     int written = fwrite( tmp, csize, 1, f );

     g_free(tmp);

     /* Could be finer-grained, but this is enough to know it succeeded/failed */

     if( written == 1 ) {

         return count;

     } else {

         return 0;

     }

 }

 int fread_gzip( void *p, size_t sz, size_t count, FILE *f )

 {

     uLongf size = sz*count;

     uint32_t csize;

     unsigned char *tmp;

     fread( &csize, sizeof(csize), 1, f );

     assert( csize <= (size*2) );

     tmp = g_malloc0( csize );

     fread( tmp, csize, 1, f );

     int status = uncompress( p, &size, tmp, csize );

     g_free(tmp);

     if( status == Z_OK ) {

         return count;

     } else {

         fprintf( stderr, "Error reading compressed data\n" );

         return 0;

     }

 }

 void fwrite_dump( unsigned char *data, unsigned int length, FILE *f ) 

 {

     unsigned int i, j;

     for( i =0; i<length; i+=16 ) {

         fprintf( f, "%08X:", i);

         for( j=i; j<i+16; j++ ) {

             if( (j % 4) == 0 )

                 fprintf( f, " " );

             if( j < length )

                 fprintf( f, " %02X", (unsigned int)(data[j]) );

             else

                 fprintf( f, "   " );

         }

         fprintf( f, "  " );

         for( j=i; j<i+16 && j<length; j++ ) {

             fprintf( f, "%c", isprint(data[j]) ? data[j] : '.' );

         }

         fprintf( f, "\n" );

     }

 }

 void fwrite_dump32( unsigned int *data, unsigned int length, FILE *f ) 

 {

     fwrite_dump32v( data, length, 8, f );

 }

 void fwrite_dump32v( unsigned int *data, unsigned int length, int wordsPerLine, FILE *f ) 

 {

     unsigned int i, j;

     for( i =0; i<length>>2; i+=wordsPerLine ) {

         fprintf( f, "%08X:", i);

         for( j=i; j<i+wordsPerLine; j++ ) {

             if( j < length )

                 fprintf( f, " %08X", (unsigned int)(data[j]) );

             else

                 fprintf( f, "         " );

         }

         fprintf( f, "\n" );

     }

 }

 gboolean write_png_to_stream( FILE *f, frame_buffer_t buffer )

 {

     int coltype, i;

     png_bytep p;

     png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);

     if (!png_ptr) {

         return FALSE;

     }

     png_infop info_ptr = png_create_info_struct(png_ptr);

     if (!info_ptr) {

         png_destroy_write_struct(&png_ptr, NULL);

         return FALSE;

     }

     if( setjmp(png_jmpbuf(png_ptr)) ) {

         png_destroy_write_struct(&png_ptr, &info_ptr);

         return FALSE;

     }

     png_init_io( png_ptr, f );

     switch( buffer->colour_format ) {

     case COLFMT_BGR888:

         coltype = PNG_COLOR_TYPE_RGB;

         break;

     case COLFMT_BGRA8888:

         coltype = PNG_COLOR_TYPE_RGB_ALPHA;

         break;

     case COLFMT_BGR0888:

         coltype = PNG_COLOR_TYPE_RGB;

         break;

     default:

         coltype = PNG_COLOR_TYPE_RGB;

     }

     png_set_IHDR(png_ptr, info_ptr, buffer->width, buffer->height,

                  8, coltype, PNG_INTERLACE_NONE, 

                  PNG_COMPRESSION_TYPE_DEFAULT, 

                  PNG_FILTER_TYPE_DEFAULT );

     png_write_info(png_ptr, info_ptr);

     if( buffer->colour_format == COLFMT_BGR0888 ) {

         png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);

     }

     png_set_bgr(png_ptr);

     if( buffer->inverted ) {

         p = (png_bytep)(buffer->data + (buffer->height*buffer->rowstride) - buffer->rowstride);

         for(i=0; i<buffer->height; i++ ) {

             png_write_row(png_ptr, p);

             p-=buffer->rowstride;

         }

     } else {

         p = (png_bytep)buffer->data;

         for(i=0; i<buffer->height; i++ ) {

             png_write_row(png_ptr, p);

             p+=buffer->rowstride;

         }

     }

     png_write_end(png_ptr, info_ptr);

     png_destroy_write_struct(&png_ptr, &info_ptr);

     return TRUE;

 }

 frame_buffer_t read_png_from_stream( FILE *f )

 {

     png_bytep p;

     int i;

     png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 

             NULL, NULL, NULL);

     if (!png_ptr) {

         return NULL;

     }

     png_infop info_ptr = png_create_info_struct(png_ptr);

     if (!info_ptr) {

         png_destroy_read_struct(&png_ptr, NULL, NULL);

         return NULL;

     }

     png_infop end_info = png_create_info_struct(png_ptr);

     if (!end_info) {

         png_destroy_read_struct(&png_ptr, &info_ptr, NULL );

         return NULL;

     }

     if( setjmp(png_jmpbuf(png_ptr)) ) {

         png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);

         return NULL;

     }

     png_init_io(png_ptr, f);

     png_read_info(png_ptr, info_ptr);

     png_uint_32 width, height;

     int bit_depth, color_type, interlace_type,

     compression_type, filter_method;

     png_get_IHDR(png_ptr, info_ptr, &width, &height,

                  &bit_depth, &color_type, &interlace_type,

                  &compression_type, &filter_method);

     assert( interlace_type == PNG_INTERLACE_NONE );

     int rowbytes = png_get_rowbytes(png_ptr, info_ptr);

     int channels = png_get_channels(png_ptr, info_ptr);

     frame_buffer_t buffer = g_malloc( sizeof(struct frame_buffer) + rowbytes*height );

     buffer->data = (unsigned char *)(buffer+1);

     buffer->width = width;

     buffer->height = height;

     buffer->rowstride = rowbytes;

     buffer->address = -1;

     buffer->size = rowbytes*height;

     buffer->inverted = FALSE;

     if( channels == 4 ) {

         buffer->colour_format = COLFMT_BGRA8888;

     } else if( channels == 3 ) {

         buffer->colour_format = COLFMT_RGB888;

     }

     p = (png_bytep)buffer->data;

     for( i=0; i<height; i++ ) {

         png_read_row(png_ptr, p, NULL );

         p += rowbytes;

     }

     png_read_end(png_ptr, end_info);

     png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);

     return buffer;

 }

 int get_log_level_from_string( const gchar *str )

 {

     switch( tolower(str[0]) ) {

     case 'd': return EMIT_DEBUG;

     case 'e': return EMIT_ERR;

     case 'f': return EMIT_FATAL;

     case 'i': return EMIT_INFO;

     case 't': return EMIT_TRACE;

     case 'w': return EMIT_WARN;

     default: return -1;

     }

 }

 gboolean set_global_log_level( const gchar *str ) 

 {

     int l = get_log_level_from_string(str);

     if( l == -1 ) {

         return FALSE;

     } else {

         global_msg_level = l;

         return TRUE;

     }

 }

 void log_message( void *ptr, int level, const gchar *source, const char *msg, ... )

 {

     char buf[20];

     time_t tm = time(NULL);

     va_list ap;

     if( level > global_msg_level ) {

         return; // ignored

     }

     va_start(ap, msg);

     gchar *text = g_strdup_vprintf( msg, ap );

     va_end(ap);

     if( level <= EMIT_ERR ) {

         if( gui_error_dialog( text ) ) {

             g_free(text);

             // If we're running, halt on error to avoid potentially flooding

             // the user with error messages.

             if( dreamcast_is_running() ) {

                 dreamcast_stop();

             }

             return;

         }

     }

     strftime( buf, sizeof(buf), "%H:%M:%S", localtime(&tm) );

     fprintf( stderr, "%s %08X %-5s %s\n", buf, sh4r.pc, msg_levels[level], text );

     g_free(text);

 }