/[public]/psiconv/trunk/lib/psiconv/parse_simple.c
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Diff of /psiconv/trunk/lib/psiconv/parse_simple.c

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Revision 79 Revision 132
… …
19 19
20#include "config.h" 20#include "config.h"
21#include "compat.h" 21#include "compat.h"
22 22
23#include <stdlib.h> 23#include <stdlib.h>
24#include <math.h>
24 25
25#include "parse_routines.h" 26#include "parse_routines.h"
26#include "error.h" 27#include "error.h"
27 28
29/* Very inefficient, but good enough for now. By implementing it ourselves,
30 we do not have to link with -lm */
31psiconv_float_t pow2(int n)
32{
33 psiconv_float_t res=1.0;
34 int i;
35
36 for (i = 0; i < (n<0?-n:n); i++)
37 res *= 2.0;
38
39 return n<0?1/res:res;
40}
28psiconv_u8 psiconv_read_u8(const psiconv_buffer buf,int lev,psiconv_u32 off, 41psiconv_u8 psiconv_read_u8(const psiconv_buffer buf,int lev,psiconv_u32 off,
29 int *status) 42 int *status)
30{ 43{
31 psiconv_u8 *ptr; 44 psiconv_u8 *ptr;
32 ptr = psiconv_buffer_get(buf,off); 45 ptr = psiconv_buffer_get(buf,off);
… …
75 if (status) 88 if (status)
76 *status = 0; 89 *status = 0;
77 return *ptr0 + (*ptr1 << 8) + (*ptr2 << 16) + (*ptr3 << 24); 90 return *ptr0 + (*ptr1 << 8) + (*ptr2 << 16) + (*ptr3 << 24);
78} 91}
79 92
93psiconv_s32 psiconv_read_sint(const psiconv_buffer buf,int lev,psiconv_u32 off,
94 int *length,int *status)
95{
96 int localstatus;
97 psiconv_u32 temp;
98
99 temp=psiconv_read_u32(buf,lev,off,&localstatus);
100 if (status)
101 *status = localstatus;
102 if (length)
103 *length = localstatus?0:4;
104
105 return localstatus?0:(temp & 0x7fffffff)*(temp&0x80000000?-1:1);
106}
107
80psiconv_S_t psiconv_read_S(const psiconv_buffer buf, int lev, psiconv_u32 off, 108psiconv_S_t psiconv_read_S(const psiconv_buffer buf, int lev, psiconv_u32 off,
81 int *length,int *status) 109 int *length,int *status)
82{ 110{
83 psiconv_u8 temp; 111 psiconv_u8 temp;
84 psiconv_S_t res; 112 psiconv_S_t res;
… …
92 res = psiconv_read_u8(buf,lev+2,off,&localstatus) >> 2; 120 res = psiconv_read_u8(buf,lev+2,off,&localstatus) >> 2;
93 if (localstatus) 121 if (localstatus)
94 goto ERROR; 122 goto ERROR;
95 len = 1; 123 len = 1;
96 psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res); 124 psiconv_debug(lev+2,off,"Indicator (1 byte): %02x",res);
97 } else if ((temp & 0x07) == 0x03) { 125 } else if ((temp & 0x07) == 0x05) {
98 res = psiconv_read_u16(buf,lev+2,off,&localstatus) >> 3; 126 res = psiconv_read_u16(buf,lev+2,off,&localstatus) >> 3;
99 if (localstatus) 127 if (localstatus)
100 goto ERROR; 128 goto ERROR;
101 len = 2; 129 len = 2;
102 psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res); 130 psiconv_debug(lev+2,off,"Indicator (2 bytes): %04x",res);
… …
301 *status = localstatus; 329 *status = localstatus;
302 if (length) 330 if (length)
303 *length = 0; 331 *length = 0;
304 return NULL; 332 return NULL;
305} 333}
334
335psiconv_string_t psiconv_read_short_string(const psiconv_buffer buf,
336 int lev,
337 psiconv_u32 off,int *length, int *status)
338{
339 int stringlen,i,len,localstatus;
340 psiconv_string_t result;
341 char *res_copy;
342
343 psiconv_progress(lev+1,off,"Going to read a short string");
344
345 stringlen = psiconv_read_u8(buf,lev+2,off,&localstatus);
346 if (localstatus)
347 goto ERROR1;
348 psiconv_debug(lev+2,off,"Length: %i",stringlen);
349 len = 1;
350
351 result = malloc(stringlen + 1);
352 if (!result)
353 goto ERROR1;
354 for (i = 0; (i < stringlen) && !localstatus; i++)
355 result[i] = psiconv_read_u8(buf,lev,off+i+len,&localstatus);
356 if (localstatus)
357 goto ERROR2;
358 result[stringlen] = 0;
359 len += stringlen;
360
361 res_copy = psiconv_make_printable(result);
362 if (!res_copy)
363 goto ERROR2;
364 psiconv_debug(lev+2,off,"Contents: `%s'",res_copy);
365 free(res_copy);
366
367 if (length)
368 *length = len;
369
370 if (status)
371 *status = 0;
372
373 psiconv_progress(lev+1,off+len-1,"End of short string (total length: %08x)",
374 len);
375
376 return result;
377
378
379ERROR2:
380 free(result);
381ERROR1:
382 psiconv_warn(lev+1,off,"Reading of short string failed");
383 if (status)
384 *status = localstatus;
385 if (length)
386 *length = 0;
387 return NULL;
388}
389
390psiconv_float_t psiconv_read_float(const psiconv_buffer buf, int lev,
391 psiconv_u32 off, int *length, int *status)
392{
393 psiconv_float_t result,bitvalue;
394 int res,bit;
395 psiconv_u32 temp=0;
396
397 psiconv_progress(lev+1,off,"Going to read a float");
398
399 bitvalue = 0.5;
400 result = 1.0;
401 for (bit = 0x33; bit > 0; bit--) {
402 if ((bit == 0x33) || ((bit & 0x07) == 0x07))
403 temp = psiconv_read_u8(buf,lev+2,off+ (bit >> 3),&res);
404 if (res)
405 goto ERROR;
406 if (temp & (0x01 << (bit & 0x07)))
407 result += bitvalue;
408 bitvalue /= 2.0;
409 }
410 temp = psiconv_read_u16(buf,lev+2,off+6,&res);
411 if (res)
412 goto ERROR;
413 if (temp & 0x8000)
414 result = -result;
415 temp = (temp & 0x7ff0) >> 4;
416 result *= pow2(((int) temp)-0x3ff);
417 psiconv_debug(lev+1,off,"Float value: %f",result);
418 if (length)
419 *length = 8;
420 if (*status)
421 *status = res;
422 return result;
423ERROR:
424 psiconv_warn(lev+1,off,"Reading of float failed");
425 if (length)
426 *length = 0;
427 if (*status)
428 *status = res;
429 return 0.0;
430}
431
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