294 lines
6.5 KiB
C
294 lines
6.5 KiB
C
/* pngpack: lossless image compression for a series of screen shots
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* Copyright (C) 2005-2010 Carsten Gnoerlich.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA,
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* or direct your browser at http://www.gnu.org.
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*/
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#if !defined(SYS_FREEBSD) && !defined(SYS_DARWIN) /* FreeBSD declares malloc() in stdlib.h */
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#include <malloc.h>
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#endif
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/*
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* Endian fiddling
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*/
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unsigned int SwapBytes32(unsigned int in)
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{
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return
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((in & 0xff000000) >> 24)
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| ((in & 0x00ff0000) >> 8)
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| ((in & 0x0000ff00) << 8)
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| ((in & 0x000000ff) << 24);
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}
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/*
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* Tell user that current action was aborted due to a serious error.
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*/
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void Stop(char *format, ...)
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{ va_list argp;
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/*** Show message depending on commandline / GUI mode */
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fprintf(stdout, "*\n* pngpack - can not continue:\n*\n");
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va_start(argp, format);
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vfprintf(stdout, format, argp);
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va_end(argp);
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fprintf(stdout, "\n\n");
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fflush(stdout);
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exit(EXIT_FAILURE);
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}
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/***
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*** Keeping track of allocated pointers.
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***/
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/*
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* A structure containing info about each pointer which was
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* produced through our memory allocation routines.
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*/
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typedef struct _memchunk
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{ void *ptr; /* allocated memory chunk */
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int size; /* size of chunk */
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char *file; /* source file this was allocated in */
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int line; /* line number of source file */
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} memchunk;
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static struct _memchunk **ptrhash[64]; /* 64 buckets of memory chunks */
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static int phCnt[64];
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static int phMax[64];
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static int currentAllocation; /* current memory allocation */
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static int peakAllocation; /* maximum allocation */
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/*
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* Remember an allocated pointer.
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*/
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void remember(void *ptr, int size, char *file, int line)
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{ memchunk *mc;
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int hash_idx;
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hash_idx = (((long)ptr)>>3)&63;
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if(phCnt[hash_idx] >= phMax[hash_idx])
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{ if(!phMax[hash_idx]) phMax[hash_idx] = 16;
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else phMax[hash_idx] *= 2;
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if(!(ptrhash[hash_idx] = realloc(ptrhash[hash_idx], sizeof(memchunk*)*phMax[hash_idx])))
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Stop("can't realloc memchunk hashtable");
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}
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if(!(mc=malloc(sizeof(memchunk))))
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Stop("can't alloc memchunk");
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ptrhash[hash_idx][phCnt[hash_idx]++] = mc;
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mc->ptr = ptr;
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mc->size = size;
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mc->file = file;
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mc->line = line;
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currentAllocation += size;
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if(currentAllocation > peakAllocation)
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peakAllocation = currentAllocation;
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}
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/*
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* Remove a remembered pointer from the hash bucket.
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*/
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int forget(void *ptr)
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{ memchunk **ptrlist;
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int hash_idx;
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int i;
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hash_idx = (((long)ptr)>>3)&63;
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ptrlist = ptrhash[hash_idx];
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for(i=0; i<phCnt[hash_idx]; i++)
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if(ptrlist[i]->ptr==ptr)
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{ currentAllocation -= ptrlist[i]->size;
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free(ptrlist[i]);
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phCnt[hash_idx]--;
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if(phCnt[hash_idx] > 0)
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ptrlist[i] = ptrlist[phCnt[hash_idx]];
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return 0;
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}
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return 1;
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}
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/*
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* Print the contents of the ptrlist.
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*/
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static void print_ptr(memchunk *mc, int size)
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{ char strbuf[16];
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char *ptr = (char*)mc->ptr;
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int j,maxlen;
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if(mc->size < size) maxlen = mc->size; else maxlen = size;
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for(j=0; j<15; j++)
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{ if(ptr[j]<32) break;
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strbuf[j] = ptr[j];
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}
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if(j)
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{ strbuf[j]=0;
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fprintf(stdout, "Address 0x%lx (\"%s\"), %d bytes, from %s, line %d\n",
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(unsigned long)mc->ptr,strbuf,mc->size,mc->file,mc->line);
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}
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else
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fprintf(stdout, "Address 0x%lx (binary data), %d bytes, from %s, line %d\n",
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(unsigned long)mc->ptr,mc->size,mc->file,mc->line);
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}
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static void print_ptrs(char *msg)
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{ int bucket,i,n=0;
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fprintf(stdout, msg);
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for(bucket=0; bucket<64; bucket++)
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for(i=0; i<phCnt[bucket]; i++)
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{
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print_ptr(ptrhash[bucket][i], 15);
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n++;
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}
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fprintf(stdout, "%d memory chunks total.\n",n);
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}
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/***
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*** Replacements for the libc memory allocators.
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***/
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/*
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* Protected malloc().
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*/
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void *malloc_ext(int size, char* file, int line)
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{ void *ptr;
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#if 0
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printf("allocating %d bytes from file %s, line %d\n", size, file, line);
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#endif
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if(!(ptr = calloc(1,size)))
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Stop("out of memory while allocating %d bytes",size);
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remember(ptr,size,file,line);
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return ptr;
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}
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/*
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* Protected calloc().
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*/
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void *calloc_ext(int n, int size, char* file, int line)
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{ void *ptr;
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if(!(ptr = calloc(n,size)))
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Stop("out of memory while allocating %d bytes",size);
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remember(ptr,size,file,line);
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return ptr;
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}
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/*
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* Protected realloc().
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*/
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void *realloc_ext(void *ptr, int size, char *file, int line)
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{ void *ret;
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if(ptr && forget(ptr))
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{ fprintf(stdout, "trying to realloc undefined pointer 0x%lx\n"
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"file: %s, line: %d",(long)ptr,file,line);
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exit(EXIT_FAILURE);
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}
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if(!(ret=realloc(ptr,size)))
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{ fprintf(stdout, "out of memory for ptr 0x%lx, %d bytes\n",(long)ptr,size);
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exit(EXIT_FAILURE);
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}
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remember(ret,size,file,line);
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return ret;
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}
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/*
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* String duplication.
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*/
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char *strdup_ext(const char *string, char *file, int line)
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{ int length = strlen(string)+1;
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char *copy;
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if(!(copy = calloc(1,length)))
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Stop("out of memory while allocating %d bytes",length);
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strcpy(copy,string);
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remember(copy,length,file,line);
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return copy;
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}
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/*
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* Free and forget a pointer
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*/
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void free_ext(void *ptr, char *file, int line)
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{
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if(forget(ptr))
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{ fprintf(stdout, "trying to free undefined pointer 0x%lx\n"
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"file: %s, line: %d",(long)ptr,file,line);
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exit(EXIT_FAILURE);
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}
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free(ptr);
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}
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/***
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*** Checking for memory leaks.
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***/
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void CheckMemleaks(void)
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{ int i,memleak = 0;
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/*** See if some memory chunks have been left over */
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for(i=0; i<64; i++)
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if(phCnt[i])
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memleak = 1;
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if(memleak)
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{ char msg[80];
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sprintf(msg,"\npngpack:\nMemory leak warning,"
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" non-freed memory chunks detected.\n\n");
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print_ptrs(msg);
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}
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else fprintf(stdout, "\npngpack: No memory leaks found.\n");
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}
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