PHP和ruby一直是golang的新手，它具有将二进制文件解压缩为数组的解压缩功能。我正在尝试找出如何在golang中执行以下操作。
$test = "\01\00\02\03";
print_r(unpack("C*", $test)); // [1,0,2,3]
或
s = "\01\00\02\03"
arr = s.unpack("C*")
p(arr) # [1,0,2,3]
使用golang进行此操作的最佳方法是什么？
答案 0 :(得分：6)
请首先注意，您的PHP字符串let fragmentShader = `
uniform vec2 u_resolution;
uniform float u_time;
const int octaves = 6;
const float seed = 43758.5453123;
const float seed2 = 73156.8473192;
vec2 random2(vec2 st, float seed){
st = vec2( dot(st,vec2(127.1,311.7)), dot(st,vec2(269.5,183.3)) );
return -1.0 + 2.0*fract(sin(st)*seed);
}
float noise(vec2 st, float seed) {
vec2 i = floor(st);
vec2 f = fract(st);
vec2 u = f*f*(3.0-2.0*f);
return mix( mix( dot( random2(i + vec2(0.0,0.0), seed ), f - vec2(0.0,0.0) ),
dot( random2(i + vec2(1.0,0.0), seed ), f - vec2(1.0,0.0) ), u.x),
mix( dot( random2(i + vec2(0.0,1.0), seed ), f - vec2(0.0,1.0) ),
dot( random2(i + vec2(1.0,1.0), seed ), f - vec2(1.0,1.0) ), u.x), u.y);
}
float fbm1(in vec2 _st, float seed) {
float v = 0.0;
float a = 0.5;
vec2 shift = vec2(100.0);
mat2 rot = mat2(cos(0.5), sin(0.5), -sin(0.5), cos(0.50));
for (int i = 0; i < octaves; ++i) {
v += a * noise(_st, seed);
_st = rot * _st * 2.0 + shift;
a *= 0.4;
}
return v;
}
float pattern(vec2 uv, float seed, float time, inout vec2 q, inout vec2 r) {
q = vec2( fbm1( uv + vec2(0.0,0.0), seed ), fbm1( uv + vec2(5.2,1.3), seed ) );
r = vec2( fbm1( uv + 4.0*q + vec2(1.7 - time / 2.,9.2), seed ), fbm1( uv + 4.0*q + vec2(8.3 - time / 2.,2.8), seed ) );
vec2 s = vec2( fbm1( uv + 4.0*r + vec2(21.7 - time / 2.,90.2), seed ), fbm1( uv + 4.0*r + vec2(80.3 - time / 2.,20.8), seed ) );
vec2 t = vec2( fbm1( uv + 4.0*s + vec2(121.7 - time / 2.,90.2), seed ), fbm1( uv + 4.0*s + vec2(180.3 - time / 2.,20.8), seed ) );
float rtn = fbm1( uv + 4.0*t, seed );
rtn = clamp(rtn, 0., .5);
return rtn;
}
void main() {
vec2 uv = (gl_FragCoord.xy - 0.5 * u_resolution.xy) / u_resolution.y;
uv *= 1. + dot(uv, uv)*.3;
float time = u_time / 20.;
mat2 rot = mat2(cos(time), sin(time), -sin(time), cos(time));
uv = rot * uv;
uv *= 1.4 + sin(time) * .3;
uv.x -= time;
vec2 q = vec2(0.,0.);
vec2 r = vec2(0.,0.);
vec3 colour = vec3(pattern(uv, seed, time, q, r));
float QR = clamp(dot(q, r), -1., 1.);
colour += vec3((q.x + q.y) + QR * 30.,
QR * 15.,
r.x * r.y + QR * 5.
);
colour += .1;
colour = clamp(colour, 0.05, 1.);
gl_FragColor = vec4(colour + (abs(colour) * .1), 1.);
}
`
是由"\01\00\02\03"，\x01，\x00，\x02这四个字节组成的字符串， {1}}被解释为八进制。有关详细信息，请参见the documentation for double quoted strings。
在Go中，语法\x03不正确。与C中一样，八进制序列必须具有3个数字，即"\01"。因此，PHP字符串\01在Go \001中（在PHP中也可以使用）。考虑到这一点，解包很容易，并且不需要像"\01\00\02\03"这样的特殊功能：
"\001\000\002\003"输出：
unpack