mirror of
https://github.com/WinampDesktop/winamp.git
synced 2024-11-28 08:00:52 +01:00
84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
#pragma once
|
|
#include <stdint.h>
|
|
#include "foundation/types.h"
|
|
|
|
/* A simple byte-oriented reader.
|
|
use this instead of manual parsing as this deals with memory alignment issues
|
|
for you.
|
|
memory alignment can be critical and annoying on some architectures (e.g. PowerPC)
|
|
it also handles little-endian/big-endian issues
|
|
|
|
Usually you just make one of these things on the stack, passing in your buffer and length
|
|
|
|
S is signed and U is unsigned
|
|
Show functions will give you data w/o moving the stream position
|
|
Align versions of the functions will assume the stream is properly aligned
|
|
LE versions of the functions treat the byte stream as little-endian oriented
|
|
*/
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
typedef struct bytereader_struct_t
|
|
{
|
|
size_t byte_length;
|
|
const uint8_t *data_ptr;
|
|
const void *data;
|
|
} bytereader_value_t, bytereader_s, *bytereader_t;
|
|
|
|
void bytereader_init(bytereader_t byte_reader, const void *data, size_t byte_length);
|
|
static size_t bytereader_size(bytereader_t byte_reader) /* returns remaining bytes in stream */
|
|
{
|
|
return byte_reader->byte_length;
|
|
}
|
|
void bytereader_advance(bytereader_t byte_reader, size_t bytes); /* advances the byte stream */
|
|
void bytereader_reset(bytereader_t byte_reader); /* reset the data pointer and size back to the original position */
|
|
static const void *bytereader_pointer(bytereader_t byte_reader) /* returns a pointer to the current bitstream position */
|
|
{
|
|
return byte_reader->data_ptr;
|
|
}
|
|
|
|
/* returns the number of bytes to the next 0, or the end of the buffer */
|
|
size_t bytereader_find_zero(bytereader_t byte_reader);
|
|
|
|
/* n byte functions (basically memcpy) */
|
|
void bytereader_show_n(bytereader_t byte_reader, void *destination, size_t bytes);
|
|
void bytereader_read_n(bytereader_t byte_reader, void *destination, size_t bytes);
|
|
|
|
/* 1 byte functions */
|
|
uint8_t bytereader_show_u8(bytereader_t byte_reader);
|
|
uint8_t bytereader_read_u8(bytereader_t byte_reader);
|
|
int8_t bytereader_show_s8(bytereader_t byte_reader);
|
|
int8_t bytereader_read_s8(bytereader_t byte_reader);
|
|
|
|
/* 2 byte little endian functions */
|
|
uint16_t bytereader_show_u16_le(bytereader_t byte_reader);
|
|
uint16_t bytereader_read_u16_le(bytereader_t byte_reader);
|
|
int16_t bytereader_show_s16_le(bytereader_t byte_reader);
|
|
int16_t bytereader_read_s16_le(bytereader_t byte_reader);
|
|
|
|
/* 2 byte big-endian functions */
|
|
uint16_t bytereader_show_u16_be(bytereader_t byte_reader);
|
|
uint16_t bytereader_read_u16_be(bytereader_t byte_reader);
|
|
int16_t bytereader_show_s16_be(bytereader_t byte_reader);
|
|
int16_t bytereader_read_s16_be(bytereader_t byte_reader);
|
|
|
|
/* 4 byte big-endian functions */
|
|
uint32_t bytereader_show_u32_be(bytereader_t byte_reader);
|
|
uint32_t bytereader_read_u32_be(bytereader_t byte_reader);
|
|
|
|
/* 4 byte little-endian functions */
|
|
uint32_t bytereader_show_u32_le(bytereader_t byte_reader);
|
|
uint32_t bytereader_read_u32_le(bytereader_t byte_reader);
|
|
|
|
/* float functions */
|
|
float bytereader_show_f32_be(bytereader_t byte_reader);
|
|
float bytereader_read_f32_be(bytereader_t byte_reader);
|
|
|
|
GUID bytereader_read_uuid_be(bytereader_t byte_reader);
|
|
GUID bytereader_read_uuid_le(bytereader_t byte_reader);
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|