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A fork of https://github.com/crosspoint-reader/crosspoint-reader
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6.5 kB · 213 lines
C++
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214#include "ReleaseJsonParser.h"
#include <cstdlib>#include <cstring>
namespace {
void safeCopy(char* dst, size_t dstSize, const char* src, size_t srcLen) { size_t n = srcLen < dstSize - 1 ? srcLen : dstSize - 1; memcpy(dst, src, n); dst[n] = '\0';}
} // namespace
ReleaseJsonParser::ReleaseJsonParser() : parser(JsonCallbacks{this, sOnKey, sOnString, sOnNumber, sOnBool, sOnNull, sOnObjectStart, sOnObjectEnd, sOnArrayStart, sOnArrayEnd}) { safeCopy(firmwareAssetName, sizeof(firmwareAssetName), "firmware.bin", sizeof("firmware.bin") - 1); reset();}
void ReleaseJsonParser::setFirmwareAssetName(const char* name) { safeCopy(firmwareAssetName, sizeof(firmwareAssetName), name, strlen(name));}
void ReleaseJsonParser::reset() { parser.reset(); position = Position::TOP_LEVEL; lastKey = LastKey::NONE; depth = 0; assetDepth = 0; tagName[0] = '\0'; firmwareUrl[0] = '\0'; firmwareSize = 0; tagFound = false; firmwareFound = false; currentAssetName[0] = '\0'; currentAssetUrl[0] = '\0'; currentAssetSize = 0;}
void ReleaseJsonParser::feed(const char* data, size_t len) { parser.feed(data, len); }
bool ReleaseJsonParser::foundTag() const { return tagFound; }bool ReleaseJsonParser::foundFirmware() const { return firmwareFound; }const char* ReleaseJsonParser::getTagName() const { return tagName; }const char* ReleaseJsonParser::getFirmwareUrl() const { return firmwareUrl; }size_t ReleaseJsonParser::getFirmwareSize() const { return firmwareSize; }
void ReleaseJsonParser::commitAsset() { if (strcmp(currentAssetName, firmwareAssetName) == 0) { memcpy(firmwareUrl, currentAssetUrl, sizeof(firmwareUrl)); firmwareSize = currentAssetSize; firmwareFound = true; } currentAssetName[0] = '\0'; currentAssetUrl[0] = '\0'; currentAssetSize = 0;}
// -- SAX callbacks (static trampolines) -------------------------------------
void ReleaseJsonParser::sOnKey(void* ctx, const char* key, size_t len) { auto* self = static_cast<ReleaseJsonParser*>(ctx);
switch (self->position) { case Position::TOP_LEVEL: if (self->depth == 1) { if (len == 8 && memcmp(key, "tag_name", 8) == 0) self->lastKey = LastKey::TAG_NAME; else if (len == 6 && memcmp(key, "assets", 6) == 0) self->lastKey = LastKey::ASSETS; else self->lastKey = LastKey::NONE; } break; case Position::IN_ASSET_OBJECT: if (self->assetDepth == 1) { if (len == 4 && memcmp(key, "name", 4) == 0) self->lastKey = LastKey::ASSET_NAME; else if (len == 20 && memcmp(key, "browser_download_url", 20) == 0) self->lastKey = LastKey::ASSET_URL; else if (len == 4 && memcmp(key, "size", 4) == 0) self->lastKey = LastKey::ASSET_SIZE; else self->lastKey = LastKey::NONE; } break; default: break; }}
void ReleaseJsonParser::sOnString(void* ctx, const char* value, size_t len) { auto* self = static_cast<ReleaseJsonParser*>(ctx);
switch (self->lastKey) { case LastKey::TAG_NAME: if (self->position == Position::TOP_LEVEL && self->depth == 1) { safeCopy(self->tagName, sizeof(self->tagName), value, len); self->tagFound = true; } break; case LastKey::ASSET_NAME: if (self->position == Position::IN_ASSET_OBJECT && self->assetDepth == 1) safeCopy(self->currentAssetName, sizeof(self->currentAssetName), value, len); break; case LastKey::ASSET_URL: if (self->position == Position::IN_ASSET_OBJECT && self->assetDepth == 1) safeCopy(self->currentAssetUrl, sizeof(self->currentAssetUrl), value, len); break; default: break; } self->lastKey = LastKey::NONE;}
void ReleaseJsonParser::sOnNumber(void* ctx, const char* value, size_t /*len*/) { auto* self = static_cast<ReleaseJsonParser*>(ctx);
if (self->lastKey == LastKey::ASSET_SIZE && self->position == Position::IN_ASSET_OBJECT && self->assetDepth == 1) { self->currentAssetSize = static_cast<size_t>(strtoul(value, nullptr, 10)); } self->lastKey = LastKey::NONE;}
void ReleaseJsonParser::sOnBool(void* ctx, bool /*value*/) { static_cast<ReleaseJsonParser*>(ctx)->lastKey = LastKey::NONE;}
void ReleaseJsonParser::sOnNull(void* ctx) { static_cast<ReleaseJsonParser*>(ctx)->lastKey = LastKey::NONE; }
void ReleaseJsonParser::sOnObjectStart(void* ctx) { auto* self = static_cast<ReleaseJsonParser*>(ctx);
switch (self->position) { case Position::TOP_LEVEL: self->depth++; self->lastKey = LastKey::NONE; break; case Position::IN_ASSETS_ARRAY: self->position = Position::IN_ASSET_OBJECT; self->assetDepth = 1; self->currentAssetName[0] = '\0'; self->currentAssetUrl[0] = '\0'; self->currentAssetSize = 0; self->lastKey = LastKey::NONE; break; case Position::IN_ASSET_OBJECT: self->assetDepth++; self->lastKey = LastKey::NONE; break; }}
void ReleaseJsonParser::sOnObjectEnd(void* ctx) { auto* self = static_cast<ReleaseJsonParser*>(ctx);
switch (self->position) { case Position::TOP_LEVEL: if (self->depth > 0) self->depth--; break; case Position::IN_ASSET_OBJECT: self->assetDepth--; if (self->assetDepth == 0) { self->commitAsset(); self->position = Position::IN_ASSETS_ARRAY; } self->lastKey = LastKey::NONE; break; default: break; }}
void ReleaseJsonParser::sOnArrayStart(void* ctx) { auto* self = static_cast<ReleaseJsonParser*>(ctx);
switch (self->position) { case Position::TOP_LEVEL: if (self->lastKey == LastKey::ASSETS && self->depth == 1) { self->position = Position::IN_ASSETS_ARRAY; } else { self->depth++; } self->lastKey = LastKey::NONE; break; case Position::IN_ASSET_OBJECT: self->assetDepth++; self->lastKey = LastKey::NONE; break; default: break; }}
void ReleaseJsonParser::sOnArrayEnd(void* ctx) { auto* self = static_cast<ReleaseJsonParser*>(ctx);
switch (self->position) { case Position::TOP_LEVEL: if (self->depth > 0) self->depth--; break; case Position::IN_ASSETS_ARRAY: self->position = Position::TOP_LEVEL; break; case Position::IN_ASSET_OBJECT: self->assetDepth--; self->lastKey = LastKey::NONE; break; }}