ref: d87188b5b1bbe8e9a806eefa8de1b076e76578be
dir: /common/mp4ff/util.c/
#include <time.h>
#include "mp4ff.h"
/* Disk I/O */
int mp4ff_read_data(mp4ff_t *file, char *data, int size)
{
int result = 1;
if (file->stream->get_position() != file->file_position)
file->stream->seek(file->file_position);
result = file->stream->read(data, size);
file->file_position += size;
return result;
}
int mp4ff_write_data(mp4ff_t *file, char *data, int size)
{
int result;
if (file->stream->get_position() != file->file_position)
file->stream->seek(file->file_position);
result = file->stream->write(data, size);
file->file_position += size;
return result;
}
int mp4ff_test_position(mp4ff_t *file)
{
if (mp4ff_position(file) < 0)
{
printf("mp4ff_test_position: 32 bit overflow\n");
return 1;
}
else
return 0;
}
int mp4ff_read_pascal(mp4ff_t *file, char *data)
{
char len = mp4ff_read_char(file);
mp4ff_read_data(file, data, len);
data[len] = 0;
}
int mp4ff_write_pascal(mp4ff_t *file, char *data)
{
char len = strlen(data);
mp4ff_write_data(file, &len, 1);
mp4ff_write_data(file, data, len);
}
float mp4ff_read_fixed32(mp4ff_t *file)
{
unsigned long a, b, c, d;
unsigned char data[4];
mp4ff_read_data(file, data, 4);
/* fread(data, 4, 1, file->stream); */
a = data[0];
b = data[1];
c = data[2];
d = data[3];
a = (a << 8) + b;
b = (c << 8) + d;
return (float)a + (float)b / 65536;
}
int mp4ff_write_fixed32(mp4ff_t *file, float number)
{
unsigned char data[4];
int a, b;
a = number;
b = (number - a) * 65536;
data[0] = a >> 8;
data[1] = a & 0xff;
data[2] = b >> 8;
data[3] = b & 0xff;
return mp4ff_write_data(file, data, 4);
}
int mp4ff_write_int64(mp4ff_t *file, uint64_t value)
{
unsigned char data[8];
int i;
for (i = 7; i >= 0; i--) {
data[i] = value & 0xff;
value >>= 8;
}
return mp4ff_write_data(file, data, 8);
}
int mp4ff_write_int32(mp4ff_t *file, long value)
{
unsigned char data[4];
data[0] = (value & 0xff000000) >> 24;
data[1] = (value & 0xff0000) >> 16;
data[2] = (value & 0xff00) >> 8;
data[3] = value & 0xff;
return mp4ff_write_data(file, data, 4);
}
int mp4ff_write_char32(mp4ff_t *file, char *string)
{
return mp4ff_write_data(file, string, 4);
}
float mp4ff_read_fixed16(mp4ff_t *file)
{
unsigned char data[2];
mp4ff_read_data(file, data, 2);
return (float)data[0] + (float)data[1] / 256;
}
int mp4ff_write_fixed16(mp4ff_t *file, float number)
{
unsigned char data[2];
int a, b;
a = number;
b = (number - a) * 256;
data[0] = a;
data[1] = b;
return mp4ff_write_data(file, data, 2);
}
uint64_t mp4ff_read_int64(mp4ff_t *file)
{
unsigned char data[8];
uint64_t result = 0;
int i;
mp4ff_read_data(file, data, 8);
for (i = 0; i < 8; i++) {
result |= ((uint64_t)data[i]) << ((7 - i) * 8);
}
return result;
}
long mp4ff_read_int32(mp4ff_t *file)
{
unsigned long result;
unsigned long a, b, c, d;
char data[4];
mp4ff_read_data(file, data, 4);
a = (unsigned char)data[0];
b = (unsigned char)data[1];
c = (unsigned char)data[2];
d = (unsigned char)data[3];
result = (a<<24) | (b<<16) | (c<<8) | d;
return (long)result;
}
long mp4ff_read_int24(mp4ff_t *file)
{
unsigned long result;
unsigned long a, b, c;
char data[4];
mp4ff_read_data(file, data, 3);
/* fread(data, 3, 1, file->stream); */
a = (unsigned char)data[0];
b = (unsigned char)data[1];
c = (unsigned char)data[2];
result = (a<<16) | (b<<8) | c;
return (long)result;
}
int mp4ff_write_int24(mp4ff_t *file, long number)
{
unsigned char data[3];
data[0] = (number & 0xff0000) >> 16;
data[1] = (number & 0xff00) >> 8;
data[2] = (number & 0xff);
return mp4ff_write_data(file, data, 3);
/* return fwrite(data, 3, 1, file->stream); */
}
int mp4ff_read_int16(mp4ff_t *file)
{
unsigned long result;
unsigned long a, b;
char data[2];
mp4ff_read_data(file, data, 2);
/* fread(data, 2, 1, file->stream); */
a = (unsigned char)data[0];
b = (unsigned char)data[1];
result = (a<<8) | b;
return (int)result;
}
int mp4ff_write_int16(mp4ff_t *file, int number)
{
unsigned char data[2];
data[0] = (number & 0xff00) >> 8;
data[1] = (number & 0xff);
return mp4ff_write_data(file, data, 2);
/* return fwrite(data, 2, 1, file->stream); */
}
int mp4ff_read_char(mp4ff_t *file)
{
char output;
mp4ff_read_data(file, &output, 1);
return output;
}
int mp4ff_write_char(mp4ff_t *file, char x)
{
return mp4ff_write_data(file, &x, 1);
}
int mp4ff_read_char32(mp4ff_t *file, char *string)
{
mp4ff_read_data(file, string, 4);
/* fread(string, 4, 1, file->stream); */
}
long mp4ff_position(mp4ff_t *file)
{
return file->file_position;
}
int mp4ff_set_position(mp4ff_t *file, long position)
{
file->file_position = position;
return 0;
/* fseek(file->stream, position, SEEK_SET); */
}
int mp4ff_copy_char32(char *output, char *input)
{
*output++ = *input++;
*output++ = *input++;
*output++ = *input++;
*output = *input;
}
void mp4ff_print_chars(char *desc, char *input, int len)
{
int i;
printf("%s", desc);
for(i = 0; i < len; i++)
printf("%c", input[i]);
printf("\n");
}
unsigned long mp4ff_current_time()
{
time_t t = 0;
//time(&t);
return (t+(66*31536000)+1468800);
}
int mp4ff_match_32(char *input, char *output)
{
if(input[0] == output[0] &&
input[1] == output[1] &&
input[2] == output[2] &&
input[3] == output[3])
return 1;
else
return 0;
}
int mp4ff_read_mp4_descr_length(mp4ff_t *file)
{
uint8_t b;
uint8_t numBytes = 0;
uint32_t length = 0;
do {
b = mp4ff_read_char(file);
numBytes++;
length = (length << 7) | (b & 0x7F);
} while ((b & 0x80) && numBytes < 4);
return length;
}
int mp4ff_write_mp4_descr_length(mp4ff_t *file, int length, unsigned char compact)
{
uint8_t b;
int8_t i;
int8_t numBytes;
if (compact) {
if (length <= 0x7F) {
numBytes = 1;
} else if (length <= 0x3FFF) {
numBytes = 2;
} else if (length <= 0x1FFFFF) {
numBytes = 3;
} else {
numBytes = 4;
}
} else {
numBytes = 4;
}
for (i = numBytes-1; i >= 0; i--) {
b = (length >> (i * 7)) & 0x7F;
if (i != 0) {
b |= 0x80;
}
mp4ff_write_char(file, b);
}
return numBytes;
}
void mp4ff_atom_hexdump(mp4ff_t* file, mp4ff_atom_t* atom)
{
int i;
int oldPos;
oldPos = mp4ff_position(file);
mp4ff_set_position(file, atom->start);
printf("atom hex dump:\n");
for (i = 0; i < atom->size; i++) {
printf("%02x ", (uint8_t)mp4ff_read_char(file));
if ((i % 16) == 0 && i > 0) {
printf("\n");
}
}
printf("\n");
mp4ff_set_position(file, oldPos);
}