80 lines
1.6 KiB
C++
80 lines
1.6 KiB
C++
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#include <BAN/ScopeGuard.h>
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#include <BAN/String.h>
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#include <LibImage/Image.h>
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#include <LibImage/Netbpm.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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namespace LibImage
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{
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BAN::ErrorOr<BAN::UniqPtr<Image>> Image::load_from_file(BAN::StringView path)
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{
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int fd = -1;
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if (path.data()[path.size()] == '\0')
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{
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fd = open(path.data(), O_RDONLY);
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}
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else
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{
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BAN::String path_str;
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TRY(path_str.append(path));
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fd = open(path_str.data(), O_RDONLY);
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}
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if (fd == -1)
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{
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fprintf(stddbg, "open: %s\n", strerror(errno));
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return BAN::Error::from_errno(errno);
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}
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BAN::ScopeGuard guard_file_close([fd] { close(fd); });
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struct stat st;
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if (fstat(fd, &st) == -1)
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{
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fprintf(stddbg, "fstat: %s\n", strerror(errno));
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return BAN::Error::from_errno(errno);
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}
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if (st.st_size < 2)
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{
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fprintf(stddbg, "invalid image (too small)\n");
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return BAN::Error::from_errno(EINVAL);
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}
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void* addr = mmap(nullptr, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
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if (addr == MAP_FAILED)
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{
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fprintf(stddbg, "mmap: %s\n", strerror(errno));
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return BAN::Error::from_errno(errno);
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}
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BAN::ScopeGuard guard_munmap([&] { munmap(addr, st.st_size); });
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auto image_data_span = BAN::ConstByteSpan(reinterpret_cast<uint8_t*>(addr), st.st_size);
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uint16_t u16_signature = image_data_span.as<const uint16_t>();
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switch (u16_signature)
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{
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case 0x3650:
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case 0x3550:
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case 0x3450:
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case 0x3350:
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case 0x3250:
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case 0x3150:
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return TRY(load_netbpm(image_data_span));
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default:
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fprintf(stderr, "unrecognized image format\n");
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break;
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}
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return BAN::Error::from_errno(ENOTSUP);
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}
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}
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