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aff_toc.cpp
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aff_toc.cpp
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/*
* afflib_dir.cpp:
*
* Functions for the manipulation of the AFF directories
*/
#include "affconfig.h"
#include "afflib.h"
#include "afflib_i.h"
int aff_toc_free(AFFILE *af)
{
if(af->toc){
for(int i=0;i<af->toc_count;i++){
if(af->toc[i].name) free(af->toc[i].name);
}
free(af->toc);
af->toc = 0;
af->toc_count = 0;
}
return 0;
}
void aff_toc_print(AFFILE *af)
{
printf("AF DIRECTORY:\n");
for(int i=0;i<af->toc_count;i++){
if(af->toc[i].name){
printf("%-32s @%"I64u" len: %"I64u" \n",af->toc[i].name, af->toc[i].offset,af->toc[i].segment_len);
}
}
}
#if 0
static int toc_sort(const void *a_,const void *b_)
{
const aff_toc_mem *a = (const aff_toc_mem *)a_;
const aff_toc_mem *b = (const aff_toc_mem *)b_;
if(a->offset < b->offset) return -1;
if(a->offset > b->offset) return 1;
return 0;
}
#endif
static int aff_toc_append(AFFILE *af,const char *segname,uint64_t offset,uint64_t datalen)
{
af->toc = (aff_toc_mem *)realloc(af->toc,sizeof(*af->toc)*(af->toc_count+1));
if(af->toc==0){
(*af->error_reporter)("realloc() failed in aff_toc_append. toc_count=%d\n",af->toc_count);
return -1;
}
af->toc[af->toc_count].offset = offset;
af->toc[af->toc_count].name = strdup(segname); // make a copy of the string
af->toc[af->toc_count].segment_len = aff_segment_overhead(segname)+datalen;
af->toc_count++;
return 0;
}
/* Find an empty slot in the TOC in which to put the TOC.
* Otherwise add it to the end.
*/
void aff_toc_update(AFFILE *af,const char *segname,uint64_t offset,uint64_t datalen)
{
for(int i=0;i<af->toc_count;i++){
if(af->toc[i].name==0 || strcmp(af->toc[i].name,segname)==0){
if(af->toc[i].name==0){ // if name was empty, copy it over
af->toc[i].name = strdup(segname);
}
af->toc[i].offset = offset;
af->toc[i].segment_len = aff_segment_overhead(segname)+datalen;
return;
}
}
aff_toc_append(af,segname,offset,datalen); /* Need to append it to the directory */
}
/*
* aff_toc_build:
* Build the directory by reading the existing file.
* Notice that we know that we can simply append.
*/
int aff_toc_build(AFFILE *af) // build the dir if we couldn't find it
{
aff_toc_free(af); // clear the old one
af_rewind_seg(af); // start at the beginning
// note: was malloc(0), but that causes problems under Borland
af->toc = (aff_toc_mem *)malloc(sizeof(aff_toc_mem));
while(1){
char segname[AF_MAX_NAME_LEN];
size_t segname_len=sizeof(segname);
uint64_t pos = ftello(af->aseg);
size_t datalen=0;
int r = af_get_next_seg(af,segname,segname_len,0,0,&datalen);
switch(r){
case AF_ERROR_NO_ERROR:
if(aff_toc_append(af,segname,pos,datalen)){
return -1; // malloc error?
}
break;
case AF_ERROR_EOF:
return 0; // end of file; no errors
default: /* unknown error */
fseeko(af->aseg,pos,SEEK_SET); // go back
return r; // send up the error code
}
}
return AF_ERROR_NO_ERROR;
}
/*
* return the named entry in the directory
*/
struct aff_toc_mem *aff_toc(AFFILE *af,const char *segname)
{
for(int i=0;i<af->toc_count;i++){
if(af->toc[i].name && strcmp(af->toc[i].name,segname)==0) return &af->toc[i];
}
return 0;
}
/* Delete something from the directory, but don't bother reallocating.*/
int aff_toc_del(AFFILE *af,const char *segname)
{
for(int i=0;i<af->toc_count;i++){
if(af->toc[i].name && strcmp(af->toc[i].name,segname)==0){
free(af->toc[i].name);
af->toc[i].name=0;
return 0; // should only be in TOC once
}
}
return -1;
}

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aff_toc.cpp (3 KB)

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