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#define _LARGEFILE64_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <zlib.h>
#include <bzlib.h>
#include "sanitizer.h"
#include "input.h"
struct Input {
char *name;
enum { plainFile, gzipFile, bzip2File } type;
void *fileHandle;
int eof;
char buf[4096];
int buf_ptr, buf_fill;
};
int readFile(void *context, char * buffer, int len)
{
struct Input *ctx = context;
void *f = ctx->fileHandle;
int l = 0;
if (ctx->eof || (len == 0))
return 0;
switch(ctx->type) {
case plainFile:
l = read(*(int *)f, buffer, len);
break;
case gzipFile:
l = gzread((gzFile)f, buffer, len);
break;
case bzip2File:
l = BZ2_bzread((BZFILE *)f, buffer, len);
break;
default:
fprintf(stderr, "Bad file type\n");
break;
}
if (l < 0) {
fprintf(stderr, "File reader received error %d\n", l);
l = 0;
}
if (!l)
ctx->eof = 1;
return l;
}
char inputGetChar(void *context)
{
struct Input *ctx = context;
if (ctx->buf_ptr == ctx->buf_fill) {
ctx->buf_fill = readFile(context, &ctx->buf[0], sizeof(ctx->buf));
ctx->buf_ptr = 0;
if (ctx->buf_fill == 0)
return 0;
if (ctx->buf_fill < 0) {
perror("Error while reading file");
exit(1);
}
}
//readFile(context, &c, 1);
return ctx->buf[ctx->buf_ptr++];
}
int inputEof(void *context)
{
return ((struct Input *)context)->eof;
}
void *inputOpen(const char *name)
{
const char *ext = strrchr(name, '.');
struct Input *ctx = malloc (sizeof(*ctx));
if (!ctx)
return NULL;
memset(ctx, 0, sizeof(*ctx));
ctx->name = strdup(name);
if (ext && !strcmp(ext, ".gz")) {
ctx->fileHandle = (void *)gzopen(name, "rb");
ctx->type = gzipFile;
} else if (ext && !strcmp(ext, ".bz2")) {
ctx->fileHandle = (void *)BZ2_bzopen(name, "rb");
ctx->type = bzip2File;
} else {
int *pfd = malloc(sizeof(pfd));
if (pfd) {
if (!strcmp(name, "-")) {
*pfd = STDIN_FILENO;
} else {
int flags = O_RDONLY;
#ifdef O_LARGEFILE
flags |= O_LARGEFILE;
#endif
*pfd = open(name, flags);
if (*pfd < 0) {
free(pfd);
pfd = NULL;
}
}
}
ctx->fileHandle = (void *)pfd;
ctx->type = plainFile;
}
if (!ctx->fileHandle) {
fprintf(stderr, "error while opening file %s\n", name);
exit(10);
}
ctx->buf_ptr = 0;
ctx->buf_fill = 0;
return (void *)ctx;
}
int inputClose(void *context)
{
struct Input *ctx = context;
void *f = ctx->fileHandle;
switch(ctx->type) {
case plainFile:
close(*(int *)f);
free(f);
break;
case gzipFile:
gzclose((gzFile)f);
break;
case bzip2File:
BZ2_bzclose((BZFILE *)f);
break;
default:
fprintf(stderr, "Bad file type\n");
break;
}
free(ctx->name);
free(ctx);
return 0;
}
xmlTextReaderPtr inputUTF8(const char *name)
{
void *ctx = inputOpen(name);
if (!ctx) {
fprintf(stderr, "Input reader create failed for: %s\n", name);
return NULL;
}
return xmlReaderForIO(readFile, inputClose, (void *)ctx, NULL, NULL, 0);
}
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