forked from Bananymous/banan-os
109 lines
2.5 KiB
C++
109 lines
2.5 KiB
C++
#include "Netbpm.h"
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#include <BAN/Optional.h>
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#include <ctype.h>
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#include <stdio.h>
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BAN::Optional<uint64_t> parse_u64(const uint8_t*& data, size_t data_size)
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{
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uint64_t result = 0;
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// max supported size 10^20 - 1
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for (size_t i = 0; i < 19; i++)
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{
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if (i >= data_size)
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{
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if (isdigit(*data))
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return {};
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return result;
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}
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if (!isdigit(*data))
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return result;
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result = (result * 10) + (*data - '0');
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data++;
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}
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return {};
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}
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BAN::ErrorOr<BAN::UniqPtr<Netbpm>> Netbpm::create(const void* mmap_addr, size_t size)
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{
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if (size < 11)
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{
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fprintf(stderr, "invalid Netbpm image (too small)\n");
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return BAN::Error::from_errno(EINVAL);
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}
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const uint8_t* u8_ptr = reinterpret_cast<const uint8_t*>(mmap_addr);
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if (u8_ptr[0] != 'P')
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{
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fprintf(stderr, "not Netbpm image\n");
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return BAN::Error::from_errno(EINVAL);
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}
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if (u8_ptr[1] != '6')
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{
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fprintf(stderr, "unsupported Netbpm image\n");
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return BAN::Error::from_errno(EINVAL);
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}
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if (u8_ptr[2] != '\n')
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{
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fprintf(stderr, "invalid Netbpm image (invalid header)\n");
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return BAN::Error::from_errno(EINVAL);
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}
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u8_ptr += 3;
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auto width = parse_u64(u8_ptr, size - (u8_ptr - reinterpret_cast<const uint8_t*>(mmap_addr)));
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if (!width.has_value() || *u8_ptr != ' ')
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{
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fprintf(stderr, "invalid Netbpm image (invalid width)\n");
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return BAN::Error::from_errno(EINVAL);
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}
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u8_ptr++;
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auto height = parse_u64(u8_ptr, size - (u8_ptr - reinterpret_cast<const uint8_t*>(mmap_addr)));
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if (!height.has_value() || *u8_ptr != '\n')
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{
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fprintf(stderr, "invalid Netbpm image (invalid height)\n");
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return BAN::Error::from_errno(EINVAL);
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}
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u8_ptr++;
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auto header_end = parse_u64(u8_ptr, size - (u8_ptr - reinterpret_cast<const uint8_t*>(mmap_addr)));
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if (!header_end.has_value() || *header_end != 255 || *u8_ptr != '\n')
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{
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fprintf(stderr, "invalid Netbpm image (invalid header end)\n");
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return BAN::Error::from_errno(EINVAL);
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}
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u8_ptr++;
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if (size - (u8_ptr - reinterpret_cast<const uint8_t*>(mmap_addr)) < *width * *height * 3)
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{
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fprintf(stderr, "invalid Netbpm image (too small file size)\n");
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return BAN::Error::from_errno(EINVAL);
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}
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printf("Netbpm image %llux%llu\n", *width, *height);
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BAN::Vector<Color> bitmap;
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TRY(bitmap.resize(*width * *height));
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// Fill bitmap
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for (uint64_t y = 0; y < *height; y++)
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{
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for (uint64_t x = 0; x < *width; x++)
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{
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auto& pixel = bitmap[y * *width + x];
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pixel.r = *u8_ptr++;
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pixel.g = *u8_ptr++;
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pixel.b = *u8_ptr++;
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pixel.a = 0xFF;
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}
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}
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return TRY(BAN::UniqPtr<Netbpm>::create(*width, *height, BAN::move(bitmap)));
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}
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