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-rw-r--r--src/lib/formats/fsblk.cpp254
1 files changed, 254 insertions, 0 deletions
diff --git a/src/lib/formats/fsblk.cpp b/src/lib/formats/fsblk.cpp
new file mode 100644
index 00000000000..5e8198d0ce8
--- /dev/null
+++ b/src/lib/formats/fsblk.cpp
@@ -0,0 +1,254 @@
+// license:BSD-3-Clause
+// copyright-holders:Olivier Galibert
+
+// Filesystem operations on mounted image blocks
+
+#include "fsblk.h"
+
+#include "multibyte.h"
+#include "strformat.h"
+
+#include <cstring>
+#include <stdexcept>
+
+namespace fs {
+
+void fsblk_t::set_block_size(u32 block_size)
+{
+ m_block_size = block_size;
+}
+
+const u8 *fsblk_t::block_t::roffs(const char *function, u32 off, u32 size) const
+{
+ if(off + size > m_size)
+ throw std::out_of_range(util::string_format("block_t::%s out-of-block read access, offset=%d, size=%d, block size=%d", function, off, size, m_size));
+ return rodata() + off;
+}
+
+u8 *fsblk_t::block_t::woffs(const char *function, u32 off, u32 size)
+{
+ if(off + size > m_size)
+ throw std::out_of_range(util::string_format("block_t::%s out-of-block access, offset=%d, size=%d, block size=%d", function, off, size, m_size));
+ return data() + off;
+}
+
+void fsblk_t::block_t::write(u32 offset, const u8 *src, u32 size)
+{
+ memcpy(woffs("write", offset, size), src, size);
+}
+
+void fsblk_t::block_t::fill(u32 offset, u8 data, u32 size)
+{
+ memset(woffs("fill", offset, size), data, size);
+}
+
+void fsblk_t::block_t::fill(u8 data)
+{
+ memset(this->data(), data, size());
+}
+
+void fsblk_t::block_t::wstr(u32 offset, std::string_view str)
+{
+ memcpy(woffs("wstr", offset, str.size()), str.data(), str.size());
+}
+
+void fsblk_t::block_t::w8(u32 offset, u8 data)
+{
+ woffs("w8", offset, 1)[0] = data;
+}
+
+void fsblk_t::block_t::w16b(u32 offset, u16 data)
+{
+ put_u16be(woffs("w16b", offset, 2), data);
+}
+
+void fsblk_t::block_t::w24b(u32 offset, u32 data)
+{
+ put_u24be(woffs("w24b", offset, 3), data);
+}
+
+void fsblk_t::block_t::w32b(u32 offset, u32 data)
+{
+ put_u32be(woffs("w32b", offset, 4), data);
+}
+
+void fsblk_t::block_t::w16l(u32 offset, u16 data)
+{
+ put_u16le(woffs("w16l", offset, 2), data);
+}
+
+void fsblk_t::block_t::w24l(u32 offset, u32 data)
+{
+ put_u24le(woffs("w24l", offset, 3), data);
+}
+
+void fsblk_t::block_t::w32l(u32 offset, u32 data)
+{
+ put_u32le(woffs("w32l", offset, 4), data);
+}
+
+void fsblk_t::block_t::read(u32 offset, u8 *dst, u32 size) const
+{
+ memcpy(dst, roffs("read", offset, size), size);
+}
+
+std::string_view fsblk_t::block_t::rstr(u32 offset, u32 size) const
+{
+ const u8 *d = roffs("rstr", offset, size);
+ return std::string_view(reinterpret_cast<const char *>(d), size);
+}
+
+u8 fsblk_t::block_t::r8(u32 offset) const
+{
+ return roffs("r8", offset, 1)[0];
+}
+
+u16 fsblk_t::block_t::r16b(u32 offset) const
+{
+ return get_u16be(roffs("r16b", offset, 2));
+}
+
+u32 fsblk_t::block_t::r24b(u32 offset) const
+{
+ return get_u24be(roffs("r24b", offset, 3));
+}
+
+u32 fsblk_t::block_t::r32b(u32 offset) const
+{
+ return get_u32be(roffs("r32b", offset, 4));
+}
+
+u16 fsblk_t::block_t::r16l(u32 offset) const
+{
+ return get_u16le(roffs("r16l", offset, 2));
+}
+
+u32 fsblk_t::block_t::r24l(u32 offset) const
+{
+ return get_u24le(roffs("r24l", offset, 3));
+}
+
+u32 fsblk_t::block_t::r32l(u32 offset) const
+{
+ return get_u32le(roffs("r32l", offset, 4));
+}
+
+
+
+void filesystem_t::wstr(u8 *p, std::string_view str)
+{
+ memcpy(p, str.data(), str.size());
+}
+
+std::string_view filesystem_t::rstr(const u8 *p, u32 size)
+{
+ return std::string_view(reinterpret_cast<const char *>(p), size);
+}
+
+std::string_view filesystem_t::trim_end_spaces(std::string_view str)
+{
+ const auto i = str.find_last_not_of(' ');
+ return str.substr(0, (std::string::npos != i) ? (i + 1) : 0);
+}
+
+meta_data filesystem_t::volume_metadata()
+{
+ return meta_data();
+}
+
+std::error_condition filesystem_t::volume_metadata_change(const meta_data &meta)
+{
+ return error::unsupported;
+}
+
+std::pair<std::error_condition, meta_data> filesystem_t::metadata(const std::vector<std::string> &path)
+{
+ return std::make_pair(error::unsupported, meta_data());
+}
+
+std::error_condition filesystem_t::metadata_change(const std::vector<std::string> &path, const meta_data &meta)
+{
+ return error::unsupported;
+}
+
+std::pair<std::error_condition, std::vector<dir_entry>> filesystem_t::directory_contents(const std::vector<std::string> &path)
+{
+ return std::make_pair(error::unsupported, std::vector<dir_entry>());
+}
+
+std::error_condition filesystem_t::rename(const std::vector<std::string> &opath, const std::vector<std::string> &npath)
+{
+ return error::unsupported;
+}
+
+std::error_condition filesystem_t::remove(const std::vector<std::string> &path)
+{
+ return error::unsupported;
+}
+
+std::error_condition filesystem_t::dir_create(const std::vector<std::string> &path, const meta_data &meta)
+{
+ return error::unsupported;
+}
+
+std::error_condition filesystem_t::file_create(const std::vector<std::string> &path, const meta_data &meta)
+{
+ return error::unsupported;
+}
+
+std::pair<std::error_condition, std::vector<u8>> filesystem_t::file_read(const std::vector<std::string> &path)
+{
+ return std::make_pair(error::unsupported, std::vector<u8>());
+}
+
+std::error_condition filesystem_t::file_write(const std::vector<std::string> &path, const std::vector<u8> &data)
+{
+ return error::unsupported;
+}
+
+std::pair<std::error_condition, std::vector<u8>> filesystem_t::file_rsrc_read(const std::vector<std::string> &path)
+{
+ return std::make_pair(error::unsupported, std::vector<u8>());
+}
+
+std::error_condition filesystem_t::file_rsrc_write(const std::vector<std::string> &path, const std::vector<u8> &data)
+{
+ return error::unsupported;
+}
+
+std::error_condition filesystem_t::format(const meta_data &meta)
+{
+ return error::unsupported;
+}
+
+std::error_category const &fs_category() noexcept
+{
+ class fs_category_impl : public std::error_category
+ {
+ public:
+ virtual char const *name() const noexcept override { return "fs"; }
+
+ virtual std::string message(int condition) const override
+ {
+ using namespace std::literals;
+ static std::string_view const s_messages[] = {
+ "No error"sv,
+ "Unsupported operation"sv,
+ "File or directory not found"sv,
+ "No space on volume"sv,
+ "Invalid block number"sv,
+ "Invalid filename or path"sv,
+ "Incorrect file size"sv,
+ "File already exists"sv,
+ };
+ if ((0 <= condition) && (std::size(s_messages) > condition))
+ return std::string(s_messages[condition]);
+ else
+ return "Unknown error"s;
+ }
+ };
+ static fs_category_impl const s_fs_category_instance;
+ return s_fs_category_instance;
+}
+
+} // namespace fs