diff options
Diffstat (limited to 'platform')
-rw-r--r-- | platform/android/core-files.json | 1 | ||||
-rw-r--r-- | platform/default/src/mbgl/util/compression.cpp | 104 | ||||
-rw-r--r-- | platform/ios/core-files.json | 1 | ||||
-rw-r--r-- | platform/linux/config.cmake | 1 | ||||
-rw-r--r-- | platform/macos/core-files.json | 1 |
5 files changed, 108 insertions, 0 deletions
diff --git a/platform/android/core-files.json b/platform/android/core-files.json index b19e5d9a93..362098dd9b 100644 --- a/platform/android/core-files.json +++ b/platform/android/core-files.json @@ -92,6 +92,7 @@ "platform/default/src/mbgl/gl/headless_backend.cpp", "platform/default/src/mbgl/map/map_snapshotter.cpp", "platform/default/src/mbgl/text/bidi.cpp", + "platform/default/src/mbgl/util/compression.cpp", "platform/default/src/mbgl/util/png_writer.cpp", "platform/default/src/mbgl/util/thread_local.cpp", "platform/default/src/mbgl/util/utf.cpp", diff --git a/platform/default/src/mbgl/util/compression.cpp b/platform/default/src/mbgl/util/compression.cpp new file mode 100644 index 0000000000..1742898f9e --- /dev/null +++ b/platform/default/src/mbgl/util/compression.cpp @@ -0,0 +1,104 @@ +#include <mbgl/util/compression.hpp> + +#if defined(__QT__) && defined(_WIN32) && !defined(__GNUC__) +#include <QtZlib/zlib.h> +#else +#include <zlib.h> +#endif + +#include <cstdio> +#include <cstring> +#include <stdexcept> + +// Check zlib library version. +const static bool zlibVersionCheck __attribute__((unused)) = []() { + const char *const version = zlibVersion(); + if (version[0] != ZLIB_VERSION[0]) { + char message[96]; + snprintf(message, 96, "zlib version mismatch: headers report %s, but library reports %s", + ZLIB_VERSION, version); + throw std::runtime_error(message); + } + + return true; +}(); + +namespace mbgl { +namespace util { + +// Needed when using a zlib compiled with -DZ_PREFIX +// because it will mess with this function name and +// cause a link error. +#undef compress + +std::string compress(const std::string &raw) { + z_stream deflate_stream; + memset(&deflate_stream, 0, sizeof(deflate_stream)); + + // TODO: reuse z_streams + if (deflateInit(&deflate_stream, Z_DEFAULT_COMPRESSION) != Z_OK) { + throw std::runtime_error("failed to initialize deflate"); + } + + deflate_stream.next_in = (Bytef *)raw.data(); + deflate_stream.avail_in = uInt(raw.size()); + + std::string result; + char out[16384]; + + int code; + do { + deflate_stream.next_out = reinterpret_cast<Bytef *>(out); + deflate_stream.avail_out = sizeof(out); + code = deflate(&deflate_stream, Z_FINISH); + if (result.size() < deflate_stream.total_out) { + // append the block to the output string + result.append(out, deflate_stream.total_out - result.size()); + } + } while (code == Z_OK); + + deflateEnd(&deflate_stream); + + if (code != Z_STREAM_END) { + throw std::runtime_error(deflate_stream.msg); + } + + return result; +} + +std::string decompress(const std::string &raw) { + z_stream inflate_stream; + memset(&inflate_stream, 0, sizeof(inflate_stream)); + + // TODO: reuse z_streams + if (inflateInit(&inflate_stream) != Z_OK) { + throw std::runtime_error("failed to initialize inflate"); + } + + inflate_stream.next_in = (Bytef *)raw.data(); + inflate_stream.avail_in = uInt(raw.size()); + + std::string result; + char out[15384]; + + int code; + do { + inflate_stream.next_out = reinterpret_cast<Bytef *>(out); + inflate_stream.avail_out = sizeof(out); + code = inflate(&inflate_stream, 0); + // result.append(out, sizeof(out) - inflate_stream.avail_out); + if (result.size() < inflate_stream.total_out) { + result.append(out, inflate_stream.total_out - result.size()); + } + } while (code == Z_OK); + + inflateEnd(&inflate_stream); + + if (code != Z_STREAM_END) { + throw std::runtime_error(inflate_stream.msg ? inflate_stream.msg : "decompression error"); + } + + return result; +} +} // namespace util +} // namespace mbgl diff --git a/platform/ios/core-files.json b/platform/ios/core-files.json index 67edda9733..c4930b1667 100644 --- a/platform/ios/core-files.json +++ b/platform/ios/core-files.json @@ -15,6 +15,7 @@ "platform/default/src/mbgl/gl/headless_backend.cpp", "platform/default/src/mbgl/map/map_snapshotter.cpp", "platform/default/src/mbgl/text/bidi.cpp", + "platform/default/src/mbgl/util/compression.cpp", "platform/default/src/mbgl/util/png_writer.cpp", "platform/default/src/mbgl/util/thread_local.cpp", "platform/default/src/mbgl/util/utf.cpp" diff --git a/platform/linux/config.cmake b/platform/linux/config.cmake index 74860ea0d7..55e6e3c192 100644 --- a/platform/linux/config.cmake +++ b/platform/linux/config.cmake @@ -45,6 +45,7 @@ macro(mbgl_platform_core) PRIVATE platform/linux/src/gl_functions.cpp # Misc + PRIVATE platform/default/src/mbgl/util/compression.cpp PRIVATE platform/default/src/mbgl/util/logging_stderr.cpp PRIVATE platform/default/src/mbgl/util/string_stdlib.cpp PRIVATE platform/default/src/mbgl/util/thread.cpp diff --git a/platform/macos/core-files.json b/platform/macos/core-files.json index a17a48c52f..21b0e698f0 100644 --- a/platform/macos/core-files.json +++ b/platform/macos/core-files.json @@ -14,6 +14,7 @@ "platform/default/src/mbgl/gl/headless_backend.cpp", "platform/default/src/mbgl/map/map_snapshotter.cpp", "platform/default/src/mbgl/text/bidi.cpp", + "platform/default/src/mbgl/util/compression.cpp", "platform/default/src/mbgl/util/png_writer.cpp", "platform/default/src/mbgl/util/thread_local.cpp", "platform/default/src/mbgl/util/utf.cpp" |