ref: c0a9cf79a32d93079b471ad61b767b538d1213c1
dir: /src/link/object.c/
/*
* Here we have the routines that read an objectfile
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mylink.h"
#include "main.h"
struct sSymbol **tSymbols;
struct sSection *pSections=NULL;
struct sSection *pLibSections=NULL;
UBYTE dummymem;
BBOOL oReadLib=0;
/*
* The usual byte order stuff
*
*/
SLONG readlong( FILE *f )
{
SLONG r;
r =fgetc(f);
r|=fgetc(f)<<8;
r|=fgetc(f)<<16;
r|=fgetc(f)<<24;
return( r );
}
UWORD readword( FILE *f )
{
UWORD r;
r =fgetc(f);
r|=fgetc(f)<<8;
return( r );
}
/*
* Read a NULL terminated string from a file
*
*/
SLONG readasciiz( char *s, FILE *f )
{
SLONG r=0;
while( ((*s++)=fgetc(f))!=0 )
r+=1;
return( r+1 );
}
/*
* Allocate a new section and link it into the list
*
*/
struct sSection *AllocSection( void )
{
struct sSection **ppSections;
if( oReadLib==1 )
ppSections=&pLibSections;
else
ppSections=&pSections;
while( *ppSections )
ppSections=&((*ppSections)->pNext);
if( (*ppSections)=(struct sSection *)malloc(sizeof(struct sSection)) )
{
(*ppSections)->tSymbols=tSymbols;
(*ppSections)->pNext=NULL;
(*ppSections)->pPatches=NULL;
(*ppSections)->oAssigned=0;
return( *ppSections );
}
else
{
fatalerror( "Out of memory!" );
return( NULL );
}
}
/*
* Read a symbol from a file
*
*/
struct sSymbol *obj_ReadSymbol( FILE *f )
{
char s[256];
struct sSymbol *pSym;
if( pSym=(struct sSymbol *)malloc(sizeof(struct sSymbol)) )
{
readasciiz( s, f );
if( pSym->pzName=(char *)malloc(strlen(s)+1) )
{
strcpy( pSym->pzName, s );
if( (pSym->Type=(enum eSymbolType)fgetc(f))!=SYM_IMPORT )
{
pSym->nSectionID=readlong(f);
pSym->nOffset=readlong(f);
}
return( pSym );
}
else
fatalerror( "Out of memory!" );
}
else
fatalerror( "Out of memory!" );
return( NULL );
}
/*
* RGB0 object reader routines
*
*/
struct sSection *obj_ReadRGB0Section( FILE *f )
{
struct sSection *pSection;
pSection=AllocSection();
pSection->nByteSize=readlong( f );
pSection->Type=(enum eSectionType)fgetc( f );
pSection->nOrg=-1;
pSection->nBank=-1;
/* does the user want the -s mode? */
if( (options&OPT_SMALL) && (pSection->Type==SECT_CODE) )
{
pSection->Type=SECT_HOME;
}
if( (pSection->Type==SECT_CODE) || (pSection->Type==SECT_HOME) )
{
/*
* These sectiontypes contain data...
*
*/
if( pSection->nByteSize )
{
if( pSection->pData=(UBYTE *)malloc(pSection->nByteSize) )
{
SLONG nNumberOfPatches;
struct sPatch **ppPatch, *pPatch;
char s[256];
fread( pSection->pData, sizeof(UBYTE), pSection->nByteSize, f );
nNumberOfPatches=readlong(f);
ppPatch=&pSection->pPatches;
/*
* And patches...
*
*/
while( nNumberOfPatches-- )
{
if( pPatch=(struct sPatch *)malloc(sizeof(struct sPatch)) )
{
*ppPatch=pPatch;
readasciiz( s, f );
if( pPatch->pzFilename=(char *)malloc(strlen(s)+1) )
{
strcpy( pPatch->pzFilename, s );
pPatch->nLineNo=readlong( f );
pPatch->nOffset=readlong( f );
pPatch->Type=(enum ePatchType)fgetc( f );
if( (pPatch->nRPNSize=readlong(f))>0 )
{
if( pPatch->pRPN=(UBYTE *)malloc(pPatch->nRPNSize) )
fread( pPatch->pRPN, sizeof(UBYTE), pPatch->nRPNSize, f );
else
fatalerror( "Out of memory!" );
}
else
pPatch->pRPN=NULL;
pPatch->pNext=NULL;
ppPatch=&(pPatch->pNext);
}
else
fatalerror( "Out of memory!" );
}
else
fatalerror( "Out of memory!" );
}
}
else
fatalerror( "Out of memory!" );
}
else
{
readlong(f); // Skip number of patches
pSection->pData=&dummymem;
}
}
return( pSection );
}
void obj_ReadRGB0( FILE *pObjfile )
{
struct sSection *pFirstSection;
SLONG nNumberOfSymbols, nNumberOfSections, i;
nNumberOfSymbols=readlong( pObjfile );
nNumberOfSections=readlong( pObjfile );
/* First comes the symbols */
if( nNumberOfSymbols )
{
if( tSymbols=(struct sSymbol **)malloc(nNumberOfSymbols*sizeof(struct sSymbol *)) )
{
for( i=0; i<nNumberOfSymbols; i+=1 )
tSymbols[i]=obj_ReadSymbol( pObjfile );
}
else
fatalerror( "Out of memory!" );
}
else
tSymbols=(struct sSymbol **)&dummymem;
/* Next we have the sections */
pFirstSection=NULL;
while( nNumberOfSections-- )
{
struct sSection *pNewSection;
pNewSection=obj_ReadRGB0Section( pObjfile );
pNewSection->nNumberOfSymbols=nNumberOfSymbols;
if( pFirstSection==NULL )
pFirstSection=pNewSection;
}
/*
* Fill in the pSection entry in the symbolstructure.
* This REALLY needs some cleaning up... but, hey, it works
*
*/
for( i=0; i<nNumberOfSymbols; i+=1 )
{
struct sSection *pConvSect=pFirstSection;
if( tSymbols[i]->Type!=SYM_IMPORT && tSymbols[i]->nSectionID!=-1 )
{
SLONG j=0;
while( j != tSymbols[i]->nSectionID )
{
j+=1;
pConvSect=pConvSect->pNext;
}
tSymbols[i]->pSection=pConvSect;
}
else
tSymbols[i]->pSection=NULL;
}
}
/*
* RGB1 object reader routines
*
*/
struct sSection *obj_ReadRGB1Section( FILE *f )
{
struct sSection *pSection;
pSection=AllocSection();
pSection->nByteSize=readlong( f );
pSection->Type=(enum eSectionType)fgetc( f );
/*
* And because of THIS new feature I'll have to rewrite loads and
* loads of stuff... oh well it needed to be done anyway
*
*/
pSection->nOrg=readlong( f );
pSection->nBank=readlong( f );
/* does the user want the -s mode? */
if( (options&OPT_SMALL) && (pSection->Type==SECT_CODE) )
{
pSection->Type=SECT_HOME;
}
if( (pSection->Type==SECT_CODE) || (pSection->Type==SECT_HOME) )
{
/*
* These sectiontypes contain data...
*
*/
if( pSection->nByteSize )
{
if( pSection->pData=(UBYTE *)malloc(pSection->nByteSize) )
{
SLONG nNumberOfPatches;
struct sPatch **ppPatch, *pPatch;
char s[256];
fread( pSection->pData, sizeof(UBYTE), pSection->nByteSize, f );
nNumberOfPatches=readlong(f);
ppPatch=&pSection->pPatches;
/*
* And patches...
*
*/
while( nNumberOfPatches-- )
{
if( pPatch=(struct sPatch *)malloc(sizeof(struct sPatch)) )
{
*ppPatch=pPatch;
readasciiz( s, f );
if( pPatch->pzFilename=(char *)malloc(strlen(s)+1) )
{
strcpy( pPatch->pzFilename, s );
pPatch->nLineNo=readlong( f );
pPatch->nOffset=readlong( f );
pPatch->Type=(enum ePatchType)fgetc( f );
if( (pPatch->nRPNSize=readlong(f))>0 )
{
if( pPatch->pRPN=(UBYTE *)malloc(pPatch->nRPNSize) )
fread( pPatch->pRPN, sizeof(UBYTE), pPatch->nRPNSize, f );
else
fatalerror( "Out of memory!" );
}
else
pPatch->pRPN=NULL;
pPatch->pNext=NULL;
ppPatch=&(pPatch->pNext);
}
else
fatalerror( "Out of memory!" );
}
else
fatalerror( "Out of memory!" );
}
}
else
fatalerror( "Out of memory!" );
}
else
{
readlong(f); // Skip number of patches
pSection->pData=&dummymem;
}
}
return( pSection );
}
void obj_ReadRGB1( FILE *pObjfile )
{
struct sSection *pFirstSection;
SLONG nNumberOfSymbols, nNumberOfSections, i;
nNumberOfSymbols=readlong( pObjfile );
nNumberOfSections=readlong( pObjfile );
/* First comes the symbols */
if( nNumberOfSymbols )
{
if( tSymbols=(struct sSymbol **)malloc(nNumberOfSymbols*sizeof(struct sSymbol *)) )
{
for( i=0; i<nNumberOfSymbols; i+=1 )
tSymbols[i]=obj_ReadSymbol( pObjfile );
}
else
fatalerror( "Out of memory!" );
}
else
tSymbols=(struct sSymbol **)&dummymem;
/* Next we have the sections */
pFirstSection=NULL;
while( nNumberOfSections-- )
{
struct sSection *pNewSection;
pNewSection=obj_ReadRGB1Section( pObjfile );
pNewSection->nNumberOfSymbols=nNumberOfSymbols;
if( pFirstSection==NULL )
pFirstSection=pNewSection;
}
/*
* Fill in the pSection entry in the symbolstructure.
* This REALLY needs some cleaning up... but, hey, it works
*
*/
for( i=0; i<nNumberOfSymbols; i+=1 )
{
struct sSection *pConvSect=pFirstSection;
if( tSymbols[i]->Type!=SYM_IMPORT && tSymbols[i]->nSectionID!=-1 )
{
SLONG j=0;
while( j != tSymbols[i]->nSectionID )
{
j+=1;
pConvSect=pConvSect->pNext;
}
tSymbols[i]->pSection=pConvSect;
}
else
tSymbols[i]->pSection=NULL;
}
}
/*
* The main objectfileloadroutine (phew)
*
*/
void obj_ReadOpenFile( FILE *pObjfile, char *tzObjectfile )
{
char tzHeader[8];
fread( tzHeader, sizeof(char), 4, pObjfile );
tzHeader[4]=0;
if( strncmp(tzHeader,"RGB", 3)==0 )
{
switch( tzHeader[3] )
{
case '0':
obj_ReadRGB0( pObjfile );
break;
case '1':
case '2': // V2 is really the same but the are new patch types
obj_ReadRGB1( pObjfile );
break;
default:
sprintf( temptext, "'%s' is an unsupported version\n", tzObjectfile );
fatalerror( temptext );
break;
}
}
else
{
sprintf( temptext, "'%s' is not a valid object\n", tzObjectfile );
fatalerror( temptext );
}
}
void obj_Readfile( char *tzObjectfile )
{
FILE *pObjfile;
if( options&OPT_SMART_C_LINK )
oReadLib=1;
else
oReadLib=0;
if( pObjfile=fopen(tzObjectfile,"rb") )
{
obj_ReadOpenFile( pObjfile, tzObjectfile );
fclose( pObjfile );
}
else
{
sprintf( temptext, "Unable to open '%s'\n", tzObjectfile );
fatalerror( temptext );
}
oReadLib=0;
}
SLONG file_Length( FILE *f )
{
ULONG r,
p;
p=ftell( f );
fseek( f, 0, SEEK_END );
r=ftell( f );
fseek( f, p, SEEK_SET );
return( r );
}
void lib_ReadXLB0( FILE *f )
{
SLONG size;
size=file_Length( f )-4;
while( size )
{
char name[256];
size-=readasciiz( name, f );
readword( f ); size-=2;
readword( f ); size-=2;
size-=readlong( f ); size-=4;
obj_ReadOpenFile( f, name );
}
}
void lib_Readfile( char *tzLibfile )
{
FILE *pObjfile;
oReadLib=1;
if( pObjfile=fopen(tzLibfile,"rb") )
{
char tzHeader[5];
fread( tzHeader, sizeof(char), 4, pObjfile );
tzHeader[4]=0;
if( strcmp(tzHeader,"XLB0")==0 )
lib_ReadXLB0( pObjfile );
else
{
sprintf( temptext, "'%s' is an invalid library\n", tzLibfile );
fatalerror( temptext );
}
fclose( pObjfile );
}
else
{
sprintf( temptext, "Unable to open '%s'\n", tzLibfile );
fatalerror( temptext );
}
}