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47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#include "helpers.h"
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namespace Midi {
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////
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// I have eliminated any doubt that this function works on variable
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// length uintvars up to 4 bytes.
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unsigned int read_variable_length(FILE *fp, unsigned int *value_size) {
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unsigned int value;
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*value_size = 1;
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if((value = fgetc(fp)) & 0x80){
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unsigned char c;
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value &= 0x7F;
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do{
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(*value_size)++;
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value = (value << 7) + ((c = fgetc(fp)) & 0x7F);
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} while (c & 0x80);
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}
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return(value);
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}
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////
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// Swap 4 bytes
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int swap_endian_32(int big_endian){
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register int little_endian;
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little_endian = (big_endian & 0x000000FF);
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little_endian = ((big_endian & 0x0000FF00) >> 0x08) | (little_endian << 0x08);
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little_endian = ((big_endian & 0x00FF0000) >> 0x10) | (little_endian << 0x08);
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little_endian = ((big_endian & 0xFF000000) >> 0x18) | (little_endian << 0x08);
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return(little_endian);
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}
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////
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// Swap 2 bytes
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short swap_endian_16(short big_endian){
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register short little_endian;
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little_endian = (big_endian & 0x00FF);
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little_endian = ((big_endian & 0xFF00) >> 0x08) | (little_endian << 0x08);
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return(little_endian);
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}
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}
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