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#include <stdio.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"
int sanitizerClose(void *context);
int sanitizerProcess(void *context, char *buffer, int len);
/* UTF8sanitizer algorithm has some nasty edge cases when trying to operate
* in a 'block at a time' mode. For example, in the following scenario:
*
* INPUT sequence is 2 buffers with a 6 byte char starting at X1
*
* [ len = 5 ] [len = 1]
* X1 X2 X3 X4 X5 X6
*
* OUTPUT: nothing is generated for first buffer
* This will itself cause caller to assume EOF (hopefully normal reader will read >> 5 bytes).
* subsequent read of len=1 whille return all 6 bytes potentially causing output buffer overflow (and overwriting input data)
*
* The solution is to provice a small output buffer to hold anything bigger than a single byte
*
*/
struct Context {
long long line;
long long chars1, chars2, chars3, chars4, chars5, chars6;
int state, current_size;
int long_char[6];
int out_char[10];
int pend;
int verbose;
void *file;
};
int sanitizerClose(void *context)
{
struct Context *ctx = context;
int r = inputClose(ctx->file);
if (ctx->verbose) {
fprintf(stderr, "Summary:\n");
fprintf(stderr, "chars1: %lld\n", ctx->chars1);
fprintf(stderr, "chars2: %lld\n", ctx->chars2);
fprintf(stderr, "chars3: %lld\n", ctx->chars3);
fprintf(stderr, "chars4: %lld\n", ctx->chars4);
fprintf(stderr, "chars5: %lld\n", ctx->chars5);
fprintf(stderr, "chars6: %lld\n", ctx->chars6);
fprintf(stderr, "lines : %lld\n", ctx->line);
}
free(ctx);
return r;
}
xmlTextReaderPtr sanitizerOpen(const char *name)
{
struct Context *ctx = malloc (sizeof(*ctx));
if (!ctx)
return NULL;
memset(ctx, 0, sizeof(*ctx));
ctx->verbose = 0;
ctx->state = 1;
ctx->pend = 0;
ctx->file = inputOpen(name);
if (!ctx->file) {
fprintf(stderr, "Input reader create failed\n");
return NULL;
}
return xmlReaderForIO(sanitizerProcess, sanitizerClose, (void *)ctx, NULL, NULL, 0);
}
int sanitizerProcess(void *context, char *buffer, int len)
{
struct Context *ctx = context;
int current_char, i, out = 0;
while (out < len) {
if (ctx->pend) {
buffer[out++] = ctx->out_char[--ctx->pend];
continue;
}
current_char=inputGetChar(ctx->file);
if (inputEof(ctx->file))
break;
if ((current_char & 128) == 0) {
//Handle_ASCII_char();
if (current_char == '\n')
ctx->line++;
else
ctx->chars1++;
if (ctx->state != 1) {
if (ctx->verbose)
fprintf(stderr, "Error at line %lld\n", ctx->line);
buffer[out++] = '_';
ctx->state = 1;
}
// buffer[out++] = current_char;
ctx->out_char[ctx->pend++] = current_char;
} else if ((current_char & (128+64)) == 128) {
// Handle_continue_char();
if(ctx->state > 1) {
ctx->state--;
if(ctx->state==1) {
// long char finished
//for(i=1; i<ctx->current_size; i++) {
// buffer[out++] = ctx->long_char[i-1];
//}
//buffer[out++] = current_char;
ctx->out_char[ctx->pend++] = current_char;
for(i=ctx->current_size-1; i>0; i--) {
ctx->out_char[ctx->pend++] = ctx->long_char[i-1];
}
}
} else {
if (ctx->verbose)
fprintf(stderr, "Error at line %lld\n", ctx->line);
buffer[out++] = '_';
ctx->state=1;
}
} else if ((current_char & (128+64+32)) == (128+64)) {
//Handle_two_bytes();
ctx->state=2;
ctx->chars2++;
ctx->current_size=2;
} else if ((current_char & (128+64+32+16)) == (128+64+32)) {
//Handle_three_bytes();
ctx->state=3;
ctx->chars3++;
ctx->current_size=3;
} else if ((current_char & (128+64+32+16+8)) == (128+64+32+16)) {
//Handle_four_bytes();
ctx->state=4;
ctx->chars4++;
ctx->current_size=4;
} else if ((current_char & (128+64+32+16+8+4)) == (128+64+32+16+8)) {
//Handle_five_bytes();
ctx->state=5;
ctx->chars5++;
ctx->current_size=5;
} else if ((current_char & (128+64+32+16+8+4+2)) == (128+64+32+16+8+4)) {
//Handle_six_bytes();
ctx->state=6;
ctx->chars6++;
ctx->current_size=6;
}
if(ctx->state>1) {
ctx->long_char[ctx->current_size-ctx->state]=current_char;
}
}
return out;
}
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