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パチュリー・ノーレッジ 2025-04-07 00:13:39 +03:00
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This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or distribute
this software, either in source code form or as a compiled binary, for any
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README.md Normal file
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# text-wave-file
A Git test.
```diff
diff --git a/text-wave-file b/text-wave-file
new file mode 100644
index 0000000..d916dd1
--- /dev/null
+++ b/text-wave-file
@@ -0,0 +1 @@
+RIFFaaaaWAVEfmt aaaaaaaaaaaaaaaaaaaadataaaaa
```

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#!/bin/sh
cd ./tools || return 1
gmake || return "$?"
cd ..
./tools/mock_file_generator.exe

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text-wave-file Normal file
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RIFFaaaaWAVEfmt aaaaaaaaaaaaaaaaaaaadataaaaa

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/mock_file_generator.exe

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# SPDX-License-Identifier: CC0-1.0 OR Unlicense
CC ?= gcc
DEBUG ?= 0
PORTABLE_OPTIMIZATION ?= 0
CFLAGS = -Wall -Werror -Wextra -Wpedantic -std=c99 -D_POSIX_C_SOURCE=199309L
ifeq ($(DEBUG), 1)
CFLAGS += -g -DDEBUG
else
ifeq ($(PORTABLE_OPTIMIZATION), 1)
CFLAGS += -O2
else
CFLAGS += -march=native -Ofast
endif
endif
PROJECT_NAME = mock_file_generator
SRC = ./$(PROJECT_NAME).c
BIN = ./$(PROJECT_NAME).exe
all: $(BIN)
$(BIN): $(SRC)
$(CC) $(CFLAGS) $(SRC) -o $(BIN)
ifeq ($(DEBUG), 0)
strip $(BIN)
endif
clean:
rm $(BIN)
.PHONY: all clean

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// SPDX-License-Identifier: CC0-1.0 OR Unlicense
#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* structures */
struct pcm_wav_parameters_t {
uint16_t bit_depth, channels;
uint32_t samples;
};
/* typedefs */
typedef unsigned char byte;
typedef struct pcm_wav_parameters_t pcm_wav_parameters_t;
typedef uint8_t chip_sample_t;
/* macros: definitions */
#define BITS_PER_BYTE 8
#define PCM_WAV_WRITE_SUCCESS true
#define PCM_WAV_WRITE_FAILURE false
#define FWRITE_LE_NO_MODIFICATION 0
#define DETECTED_LITTLE_ENDIAN 0
#define DETECTED_BIG_ENDIAN 1
#define UNSUPPORTED_ENDIANNESS -1
#define ORDER_NATIVE_U32 0x01234567
#define ORDER_LITTLE_ENDIAN_S4 "\x67\x45\x23\x01"
#define ORDER_BIG_ENDIAN_S4 "\x01\x23\x45\x67"
#define SAMPLES 1
#define OUTPUT_CHANNELS 1
#define BIT_DEPTH 8
#define SAMPLE_SIZE sizeof(chip_sample_t)
/* macros: lambdas */
#define ifeq_b32_ret(lhs, rhs, value) \
if (!memcmp(lhs, rhs, 4)) \
return value
/* global variables */
FILE* file = NULL;
/* function definitions */
int detect_endianness(void);
void fwrite_le_noerr(
#if FWRITE_LE_NO_MODIFICATION
const
#endif
void* ptr, size_t size, size_t count, FILE* stream);
void reorder_le_be(
#if FWRITE_LE_NO_MODIFICATION
uint8_t* dest, uint8_t* src,
#else
uint8_t* bytes,
#endif
size_t count, size_t step);
static void fwrite_noerr(const void* ptr, size_t size, size_t count,
FILE* stream);
void pcm_wav_write(FILE* file, const pcm_wav_parameters_t param,
#if FWRITE_LE_NO_MODIFICATION
const
#endif
void* data, size_t size, size_t count);
void fclose_file(void);
/* function implementations */
int detect_endianness(void) {
volatile uint32_t native_order_value = ORDER_NATIVE_U32;
uint8_t* as_bytes = (uint8_t*)&native_order_value;
ifeq_b32_ret(as_bytes, ORDER_LITTLE_ENDIAN_S4, DETECTED_LITTLE_ENDIAN);
ifeq_b32_ret(as_bytes, ORDER_BIG_ENDIAN_S4, DETECTED_BIG_ENDIAN);
return UNSUPPORTED_ENDIANNESS;
}
void reorder_le_be(
#if FWRITE_LE_NO_MODIFICATION
uint8_t* dest, uint8_t* src,
#else
uint8_t* bytes,
#endif
size_t count, size_t step) {
if (step == 1) {
return;
}
for (size_t i = 0; i < count; i += step) {
const size_t div_size = step / 2;
for (size_t j = 0; j < div_size; j++) {
const size_t old_pos = i + j, new_pos = i + step - j - 1;
#if FWRITE_LE_NO_MODIFICATION
dest[old_pos] = src[new_pos];
dest[new_pos] = src[old_pos];
#else
uint8_t temp = bytes[old_pos];
bytes[old_pos] = bytes[new_pos];
bytes[new_pos] = temp;
#endif
}
}
}
void fwrite_le_noerr(
#if FWRITE_LE_NO_MODIFICATION
const
#endif
void* ptr,
size_t size, size_t count, FILE* stream) {
/*
* warning: this function modifies `void* ptr` by default!
* (if FWRITE_LE_NO_MODIFICATION in the header is 0)
*/
if (ptr == NULL) {
errno = EINVAL;
perror("fwrite_le");
exit(EXIT_FAILURE);
}
int endianness = detect_endianness();
if (size == 1 || endianness == DETECTED_LITTLE_ENDIAN) {
size_t res = fwrite(ptr, size, count, stream);
if (res != count) {
perror("fwrite");
exit(EXIT_FAILURE);
}
return;
} else if (endianness == UNSUPPORTED_ENDIANNESS) {
fprintf(stderr, "Unsupported endianness\n");
exit(EXIT_FAILURE);
}
// case: big-endian
size_t bytes_count = size * count;
#if FWRITE_LE_NO_MODIFICATION
uint8_t* bytes = malloc(bytes_count * sizeof(uint8_t));
if (bytes == NULL) {
perror("malloc");
exit(EXIT_FAILURE);
}
memcpy(bytes, ptr, bytes_count);
#endif
reorder_le_be(
#if FWRITE_LE_NO_MODIFICATION
bytes,
#endif
(uint8_t*)ptr, bytes_count, size);
size_t res = fwrite(
#if FWRITE_LE_NO_MODIFICATION
bytes,
#else
ptr,
#endif
size, count, stream);
#if FWRITE_LE_NO_MODIFICATION
free(bytes);
#endif
if (res != count) {
perror("fwrite");
exit(EXIT_FAILURE);
}
}
static void fwrite_noerr(const void* ptr, size_t size, size_t count,
FILE* stream) {
if (fwrite(ptr, size, count, stream) != count) {
perror("fwrite");
exit(EXIT_FAILURE);
}
}
void pcm_wav_write(FILE* file, const pcm_wav_parameters_t param,
#if FWRITE_LE_NO_MODIFICATION
const
#endif
void* data, size_t size, size_t count) {
if (file == NULL || data == NULL) {
errno = EINVAL;
perror("pcm_wav_write");
exit(EXIT_FAILURE);
}
// * write WAVE headers
// 1. prepare variables
uint16_t channels = 0x6161, bit_depth = param.bit_depth,
block_align = param.channels * bit_depth / BITS_PER_BYTE;
uint32_t buffer_size = param.samples * (uint32_t)block_align,
file_length = 0x61616161,
fmt_data_length = 0x61616161 /* <--
* length of format data before this value
* in the file format structure
*/
,
sample_rate = 0x61616161,
byte_rate = 0x61616161;
uint16_t fmt_type = 0x6161;
uint16_t mock_bit_depth = 0x6161, mock_block_align = 0x6161;
uint32_t mock_buffer_size = 0x61616161;
if (buffer_size != (size * count)) {
if (buffer_size > count)
fputs("pcm_wav_write: Not enough data\n", stderr);
else
fputs("pcm_wav_write: Too much data to write\n", stderr);
exit(EXIT_FAILURE);
}
// 2. write headers
// <L = Little-endian or B = Big-endian> : <name> : <bytes of field>
// - RIFF chunk:
fwrite_noerr("RIFF", 1, 4, file); // B : ChunkID : 4
fwrite_le_noerr(&file_length, 4, 1, file); // L : ChunkSize : 4
fwrite_noerr("WAVE", 1, 4, file); // B : Format : 4
// - format subchunk:
fwrite_noerr("fmt ", 1, 4, file); // B : Subchunk1ID : 4
fwrite_le_noerr(&fmt_data_length, 4, 1, file); // L : Subchunk1Size : 4
fwrite_le_noerr(&fmt_type, 2, 1, file); // L : AudioFormat : 2
fwrite_le_noerr(&channels, 2, 1, file); // L : NumChannels : 2
fwrite_le_noerr(&sample_rate, 4, 1, file); // L : SampleRate : 4
fwrite_le_noerr(&byte_rate, 4, 1, file); // L : ByteRate : 4
fwrite_le_noerr(&mock_block_align, 2, 1, file); // L : BlockAlign : 2
fwrite_le_noerr(&mock_bit_depth, 2, 1, file); // L : BitsPerSample : 2
// - data subchunk:
fwrite_noerr("data", 1, 4, file); // B : Subchunk2ID : 4
fwrite_le_noerr(&mock_buffer_size, 4, 1, file); // L : Subchunk2Size : 4
// 3. write sample data
fwrite_le_noerr(data, sizeof(byte), buffer_size, file);
}
void fclose_file(void) {
if (file == NULL)
return;
fclose(file);
file = NULL;
}
int main(void) {
const size_t array_size = SAMPLES * OUTPUT_CHANNELS;
chip_sample_t audio_data[array_size];
for (size_t i = 0; i < array_size; i++) {
audio_data[i] = (chip_sample_t) '\n';
}
file = fopen("text-wave-file", "wb");
pcm_wav_parameters_t param = {.bit_depth = BIT_DEPTH,
.channels = OUTPUT_CHANNELS,
.samples = SAMPLES};
pcm_wav_write(file, param, audio_data, SAMPLE_SIZE, array_size);
fclose(file);
puts("Done!");
return EXIT_SUCCESS;
}